• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Real-Time Control System Adopted to Energy Storage for Smart Grid Low Wind Applications:A Part of Distributed Renewables in Smart City

    2022-01-08 13:06:36MDShahrukhAdnanKhanYoongChoonChangMdAshrafulKabirMuhammadlzuanFahmiBinRomliChockalingamAravindVaithilingamJakirHosain

    MD Shahrukh Adnan Khan| Yoong Choon Chang | Md Ashraful Kabir |Muhammad lzuan Fahmi Bin Romli | Chockalingam Aravind Vaithilingam |Jakir Hosain

    Abstract—In this paper,extensive efforts have been undertaken to design and develop a control system,which is incorporated with an energy storage device that can store energy from low-voltage renewable sources.The developed device acts as a storage element,which can be used to charge small-scale batteries,cellular devices,and other applications in remote places where the grid connection is not available.The circuit is developed using a case-by-case analysis.In order to solve the low output voltage problem,a bipolar junction transistor-metal oxide semiconductor field-effect transistor (BJT-MOSFET) based switch control technology with the Arduino microcontroller has been implemented.The developed control system is extremely efficient in charging batteries through a supercapacitor for low-voltage sources.In this research,a small-scale 200-W portable vertical axis wind turbine is used at a wind speed of 3 m/s.The result shows the efficiency of the proposed system as compared with the conventional systems.The proposed system can be an important tool of the latest distributed energy generation technology which is an important part of a smart city.Lastly,the limitations and future scopes of the development of the control device are discussed for the future barrier.An important future scope identified is to integrate the Internet of Things based mobile interface for remote monitoring for any kind of pandemic situation like COVID-19.Now,it is high time to get our smart city concept aligned with the post COVID pandemic situation and get us prepared smartly for similar future occurrences.

    Index Terms—Energy storage,low-voltage application,novel control system,post pandemic smart city.

    1.lntroduction

    Despite groundbreaking advancements in the sustainable energy sector,namely solar photovoltage (PV)and wind power,the proportion of renewable energy of the total energy has only improved slightly.The slight change is justified by the fact that the overall energy demand (not considering the temporary setback in 2009 due to global economic recession) has continuously increased,and this increase in turn has thwarted the development of modern renewable energy technologies[1]-[4].Moreover,conventional biomass,which accounts for more than 50% of all renewable energy,is used to produce heat;however,it has failed to meet the existing consumer demand[5]-[7].Energy harvesting is a novel approach that is rapidly flourishing.But few studies have been conducted in this field,which includes the innovative control system that is able to harvest energy from both wind and solar rays[8]-[10].

    Sarkeret al.developed a control system for low energy,which harvested energy from the environment using the vibrating piezoelectric element with the help of a diode bridge rectifier (AC-DC converter)[11].A switch-mode step-down DC-DC converter was used for the low-powered circuit to control the amount of energy stored in the battery.However,the input AC voltage with the 0.4-V amplitude was rectified and stepped up to 3.3-V DC.And the system was not incorporated with solar energy.In another research,kinetic energy was harvested in the form of mechanical energy,which was later converted to electrical energy using the electromagnetic,piezoelectric,or electrostatic transduction mechanism[12].The positive cycles of the input AC voltage were controlled using the combination of the buck and buck-boost converters to reduce the circuit size and minimize the power loss.Poureet al.built a DC-DC step-up converter with a control interface between the renewable sources and power electronics circuit due to the mismatch in output voltage levels[13].Both the systems were insufficient in handling the low-voltage output from the wind turbine or solar energy system.Ugale and Dixit used a fuzzy logic controller for solar energy control to solve the variation of irradiation and temperature[14].The produced output voltage was used for low-voltage applications.However,the control system was incapable for the energy from wind turbines.Alippi and Galperti wrote an AdHoc adaptive algorithm to keep the maximum power point tracking (MPPT) circuit at its optimum operating conditions and ensure the maximum energy transferring from a solar cell to the batteries[15].Again,the system was not operational for the low wind speed.Tan and Panda harvested wind energy using a metal-oxidesemiconductor field-effect transistor (MOSFET) rectifier for the low AC voltage under low wind speed conditions[16].The circuit also employed a DC-DC converter with a resistor emulation technique to obtain MPPT[16].They also developed a hybrid light and thermal energy harvesting scheme that uses a microcontroller-based circuit for transferring the maximum power to the connected load.In addition,Weimeret al.have been able to store wind energy in a battery,using a buck-boost converter operated in a discontinuous mode[17].The alternator,which was rotated with the help of an anemometer shaft,was operated at its maximum power point by keeping the input resistance of the converter constant[18].However,all these cases failed to incorporate solar and low wind energy to be harvested even at a low-voltage output.

    1.1.Problem Statement

    Wind and solar hybrid energy harvesting is a new concept that is growing in popularity rapidly.However,significant challenges exist in the following two major fields.The first part is about the universal control system that may require both wind and solar energy and harvest these accordingly.Few studies have developed this kind of efficient technology[19],[20].The other part is about low wind speed areas.As we know,countries,such as Malaysia,Singapore,Thailand,and Bangladesh,have low wind speeds,such as 3 m/s to 4 m/s or even less[19],[21].In addition,many areas are with multidirectional wind.Most importantly,wind turbines in low wind areas provide a low-voltage output,which is difficult to work with an off-grid system.Not enough studies have been conducted in this area.

    1.2.Research Contribution and Scope

    This paper provides an original case-by-case solution to develop a universal hybrid control system that can work for a low wind speed and energy harvest.The proposed system can be an important tool for the latest distributed energy generation technology,which is an important part of the post COVID-19 pandemic smart city framework.A detailed study has been conducted for the transducer and data acquisition (DAQ)area.An innovative approach of incorporating the supercapacitors in the energy harvesting control system has been proposed,which can harvest energy for the small battery type load of the off-grid system.

    2.Methodology

    The trial-and-error method is used in three stages.In the first stage,a complete setup with a standard 1.5-kW permanent magnet synchronous generator (PMSG) was connected to a 3-bladed vertical axis wind turbine (VAWT) with a standard control system for charging a DC battery.The result was unsatisfactory;therefore,the second stage was introduced,where 200-W PMSG incorporated into hybrid VAWT was introduced with a standard control system.Again,the system did not perform well with the low wind speed that led to the third (final) stages.The final stage included a supercapacitor-based switch control system.Sections 3,4,and 5 describe each stage in detail with the result and analysis.

    3.Stage 1:Full-Phased Control System Experimental Analysis

    In the first stage,a full-phased control system was implemented for energy harvesting.The 1.5-kW PMSG was connected to a maglev 3-bladed VAWT.Fig.1shows the machine design andTable 1provides the specification.VAWT was selected over a horizontal axis wind turbine (HAWT),because wind flows horizontally,which will give more wind speeds to VAWT than HAWT.Magnetic levitation was used to minimize the friction.The turbine was designed thoughtfully with three blades.The turbine shaft was made of wood.

    Fig.1.Machine design 1.

    Table 1:Machine design configuration 1

    3.1.Control System for Stage 1

    While VAWT was rotating,the voltage generated was measured by an AC voltage transducer.A rotary encoder kit (RE08A) was also connected with the turbine to measure the angular velocity.A DAQ device (NIUSB 6212 Driver) was connected with a laptop/personal computer (PC) for power.The rotary kit was not directly connected with the wind turbine;however,when the turbine rotated,it would get the rotary device signal so the device could measure the rotation.DAQ acquired and sent data to the laptop,which then displayed data in a presentable format,using the LabVIEW Signalexpress 2011 program.Next,the wind speed for the turbine was varied using two stand fans and the blade angle of the wind turbine was adjusted manually.The 3-phase voltage was fed to a control system with a full-wave diode bridge rectifier followed by a DC-DC step-up converter to give a constant voltage to the load (seeFig.2).

    Fig.2.Stage 1 control strategy.

    3.2.Experimental Setup

    Fig.3shows the experimental setup placed at The University of Nottingham,Malaysia Campus(UNMC),Semenyih,Selangor,Malaysia.

    3.3.Results and Discussion

    The result from the proposed design was unsatisfactory at a low wind speed.A 6-V battery was connected as the load,and the turbine stopped rotating due to insufficient torque generated at a low wind speed of 3 m/s.In addition,the voltage drop was also significant due to the DC-DC converter and transducers.Therefore,the setup was insufficient to fulfill the objective.

    Fig.3.Experimental set-up at research building,UNMC.

    4.Stage 2:Lighter VAMT Experimental Analysis

    Stage 2 includes a lighter version of VAWT.Instead of 3-bladed turbines,the blade number was increased to nine,and a hybrid version was designed to increase the output torque efficiency of the turbine at a low wind speed.However,instead of the 1.5-kW PMSG,a 200-W generator was chosen,which is compatible with the low-voltage turbine output.Fig.4shows the machine design of the proposed turbine and generator,andTable 2displays the hardware configuration.

    Table 2:Optimized system design configuration 2

    Fig.4.Machine designing 2.

    The same control system was applied in the second stage with improved VAWT connected to the maglev-based PMSG.However,the results were not promising yet.The turbine output voltage was insufficient to recharge a battery at a 3-m/s wind speed.

    5.Stage 3:Supercapacitor Bank Experimental Analysis

    To eliminate the problem and to offer a solution,the supercapacitor bank was included in the system.The problem of the first two stages was the low-voltage output from PMSG driven by the turbine at the 3-m/s low wind speed.As the purpose of the system was to charge a small off-grid load,which is a 6-V DC battery in this case,a constant voltage should be provided at the load terminal.Therefore,a full-wave diode bridge rectifier followed with a DC-DC step-up converter was placed.However,the output generator voltage was not sufficient to draw the converter and then charge the battery.To find a solution,the supercapacitor bank was positioned between the converter and the turbine.The idea was to charge the supercapacitor bank directly from the turbine via a full-wave rectifier.Then,the supercapacitor bank would charge the battery through the DC-DC converter.Therefore,the turbine output from PMSG did not require the DC-DC converter.Any output voltage,even if low,was not of concern,as the supercapacitor bank would take the current with any voltage as the input while charging.Two MOSFETs were used to control the charging and discharging processes for the supercapacitor bank.

    5.1.Control Strategies in Stage 3

    As a part of the hybrid energy harvesting,a supercapacitor bank with 8.75-F capacitance and a voltage of 10.8 V was assembled.In this energy harvesting system,a switching circuit plays a vital role.With the aid of the Arduino UNO microprocessor,two N-channel MOSFETs (P36NF06 model) were used in this project to create the switching condition in the energy harvesting circuit.A light-emitting diode (LED) was placed parallel to the gate-source pin of MOSFET for testing.The decision-making switching algorithm flowchart is illustrated inFig.5.For a lower threshold voltage,MOSFET 1 was switched to ON,so that the wind turbine could charge the supercapacitor bank.During this time,MOSFET 2 was switched to OFF which in turn isolated the battery from the supercapacitor bank.

    WhenVSupercapwas greater or equal to 7.5 V,MOSFET 1 then was switched to OFF to prevent overcharging from the wind turbine.MOSFET 2 was then switched to ON.At this time,the rechargeable battery was charged to 6 V.MOSFET 1 would be switched to ON again as soon as the voltage of supercapacitor dropped to 4 V.The charging and discharging process would be continued until the battery was charged up to 6 V.MOSFETs were placed in the stripboard of the energy harvesting circuit.Two LEDs were aligned with the bias voltage,respectively for MOSFET 1 and MOSFET 2.To indicate the circuit close status (logic high),LED would light up whenever MOSFET was switched to ON and vice versa.

    5.2.Low-Voltage Control System:Hardware and Software Designs

    A.Wind Speed Measurement

    A cup-type anemometer (Fig.6) was used for wind speed measurement.The anemometer used MOC7811 Optocoupler IC and provided DC output with the maximum of 5 V.Signals less than 5 V were moved to DAQ,which was transferred to the Labview interface (Fig.7).

    Fig.5.Flowchart of control strategy for third stage analysis.

    Fig.6.Anemometer.

    Fig.7.Front panel screenshot of Labview interface.

    B.Transducer

    InFig.8,the setup function between the Arduino board and the computer is provided.In the main loop,a variable named volt_batt is declared to store the resistance value.The function analogRead is used to get the resistance value and fed into the Arduino microprocessor.A float-type variable (voltage_battery) was created to store the value in the range from 0 to 1023 obtained from the resistance value; the corresponding value of voltage could be converted by using the following equation:

    The constant,11,was acquired from the fraction of

    Fig.8.Sensing circuit coding in Arduino.

    Hence,a constant of 11 is multiplied to the equation to obtain the actual input voltage across the terminals.The same concept was applied to the current sensing circuit.AsV=IR,the voltage value obtained was divided by the resistance to find the corresponding magnitude of the current flowing in the circuit.

    C.DC-DC Boost Converter

    A DC-DC boost converter was used to step up the input voltage from the wind turbine to a constant output voltage of 8 V,so that the overall efficiency of the system could be increased.By settingR1=100 kΩ andR2=560 kΩ,a constant output voltage of 8.18 V could be produced atVoutwith the minimum input voltage andVINis as low as 2.0 V.For testing,a variable power supply was used with the input voltage.As can be seen fromFig.9,the minimum input voltageVINof 2.0 V was required to provide an approximate output of 8 V.

    Fig.9.Analysis of Vout (V) at different VIN values.

    Fig.10.Switching Circuit Coding in Arduino IDE.

    D.Energy Harvesting Circuit

    After obtaining the desired voltage values,the switching circuit can be coded by setting the conditions of the switching algorithm in an “if”statement,as shown inFig.10.The basic working principle of this part of the code could be explained as follows.When the voltage across the supercapacitor bank was greater than 7.5 V,a signal“LOW” corresponding to 0 V was sent to the Arduino digital pin “MOSFET 1”,so that it could be switched to OFF to prevent overcharging.Simultaneously,a signal “HIGH”,which was equal to 5 V,was sent to the Arduino digital pin “MOSFET 2” and the rechargeable battery would be charged by using the supercapacitor bank.When the voltage across the supercapacitor bank was less than 4 V,a signal “HIGH” corresponding to 5 V was sent to the Arduino digital pin “MOSFET 1”,so that it could be charged up using wind power.Simultaneously,a signal “LOW”,which was equivalent to 0 V,was sent to the Arduino digital pin “MOSFET 2”until the voltage across the supercapacitor bank reached 7.5 V.This charging and discharging of the supercapacitor bank continued until the battery was charged.

    5.3.Experimental Setup

    The experimental setup was arranged at the Research Building,UNMC,as shown inFig.11.

    5.4.Results and Discussion

    The charging voltage with respect to charging time is depicted inFig.12.Although the supercapacitor bank was set to charge up to 7.5 V,it failed to achieve that.The main reason behind the failure was the low wind speed of 3 m/s,which did not provide sufficient mechanical power to PMSG.To avoid this problem,the charging voltage of the supercapacitor bank was reduced by reprogramming it to 6.8 V.A complete cycle took 95 minutes.The duration of the total charging processes (one cycle requiring 95 minutes) was calculated to be 38.4 hours to complete charging the 5-V battery from 4.2 V (saturation) to 5 V (referFig.13).

    Fig.11.Experimental Setup for the integrated system,UNMC.

    Fig.12.Supercapacitor bank voltage vs.charging time at the wind speed of 3 m/s.

    Fig.13.Battery charging voltage using the supercapacitor bank concerning time for the wind speed of 3 m/s.

    6.Conclusions and Future Work

    To recapitulate,this paper provides original findings in a low-voltage hybrid energy harvesting sector.Detailed step-by-step experiments were performed to find a suitable hybrid control system,which is capable of harvesting energy even at the low output voltage,both from wind and solar energy.The experiments,following the trial-and-error method and with an implementation of a switch-controlled supercapacitor-based control strategy,can perform adequately to charge a 5-V DC battery at the 3-m/s wind speed.The control system can also be performed using the solar and wind hybrid configuration.

    For the future scope,post COVID-19 pandemic smart city adopts the renewable energy generation in a different perspective.The vehicle to grid (V2G) and building to grid (B2G) are still in the infancy stage as a part of crowd energy.A real-time control system for energy storage with the supercapacitor could help for fast charging in these cases.Also,a network interface has been developed for the similar switched control device for real-time monitoring in Labview for the standalone energy storage system,which can be further developed to create the mobile Internet of Things based graphical user interface,so that the system can be remotely monitored from distant places.

    In addition,the work has enough future research potential.As the groundwork has been completed,the findings allow researchers to work further to improve the DC-DC converter to increase the charging efficiency in the low-voltage output.Furthermore,a more powerful and efficient supercapacitor bank can be used to observe the performance.Lastly,researchers have the platform to take the necessary steps for business modeling.

    Most importantly,for the last few years,distributed renewable energy is gaining popularity in smart city planning.This control system can make a key impact for an off-grid storage system for emergency back-up,when the grid is disconnected for any reason in a specific area.Moreover,this control system could be an option for distributed renewable generation for home energy that can also be connected to the grid system in the concept of crowd energy.

    Few significant important research and models have been developed for grid-connected PV management and Geographic Information System (GIS) based solar irradiation forecasting in recent efforts.The supercapacitor based switch control energy storage device may also be integrated for hybrid PV management.With real-time monitoring,the forecasting would be more accurate and precise.

    Acknowledgment

    Authors would like to acknowledge the Center of Research—Innovation &Commercialization Center (ICC),Canadian University of Bangladesh,and Smart City Planning Cell (SCPC),Department of Electrical and Electronic Engineering,Canadian University of Bangladesh for making the platform of this research.

    Disclosures

    The authors declare no conflicts of interest.

    国产探花极品一区二区| 爱豆传媒免费全集在线观看| 亚洲成人免费av在线播放| 午夜日韩欧美国产| 国产片内射在线| 欧美少妇被猛烈插入视频| 日本vs欧美在线观看视频| 欧美精品一区二区免费开放| 国产精品一国产av| 国产极品粉嫩免费观看在线| 国产精品秋霞免费鲁丝片| 亚洲伊人久久精品综合| 日韩精品有码人妻一区| 性少妇av在线| 成人国语在线视频| 成人漫画全彩无遮挡| 日本色播在线视频| 操出白浆在线播放| 一边亲一边摸免费视频| 午夜福利视频精品| 2021少妇久久久久久久久久久| 我要看黄色一级片免费的| www.熟女人妻精品国产| 成人国语在线视频| 少妇人妻久久综合中文| 9191精品国产免费久久| 中文字幕制服av| 亚洲,欧美,日韩| 超色免费av| 高清av免费在线| 老司机影院成人| 日本91视频免费播放| 久久国产精品大桥未久av| 亚洲美女视频黄频| 日韩免费高清中文字幕av| 国产乱人偷精品视频| 看十八女毛片水多多多| 亚洲av男天堂| 欧美国产精品va在线观看不卡| 日本91视频免费播放| 美女脱内裤让男人舔精品视频| 午夜老司机福利片| 久久韩国三级中文字幕| 亚洲成人免费av在线播放| 美女脱内裤让男人舔精品视频| 精品一区二区免费观看| 免费在线观看视频国产中文字幕亚洲 | 啦啦啦 在线观看视频| 亚洲激情五月婷婷啪啪| 性高湖久久久久久久久免费观看| 成人国语在线视频| 99热网站在线观看| 最黄视频免费看| 777米奇影视久久| 最近手机中文字幕大全| 久久精品熟女亚洲av麻豆精品| 国产成人精品久久久久久| 国产一区亚洲一区在线观看| 国产精品嫩草影院av在线观看| 国产一区有黄有色的免费视频| 免费观看人在逋| 操美女的视频在线观看| 中文字幕精品免费在线观看视频| 一区二区日韩欧美中文字幕| 大香蕉久久成人网| 国产免费视频播放在线视频| 丝袜喷水一区| 伊人亚洲综合成人网| 国产成人啪精品午夜网站| 女性被躁到高潮视频| 欧美97在线视频| 亚洲一码二码三码区别大吗| av天堂久久9| 国产精品一二三区在线看| 欧美黄色片欧美黄色片| 又大又黄又爽视频免费| 老司机深夜福利视频在线观看 | 国产 精品1| 国产精品香港三级国产av潘金莲 | 午夜激情久久久久久久| 青春草国产在线视频| 国产毛片在线视频| 亚洲美女视频黄频| 亚洲精品国产av成人精品| tube8黄色片| 国产成人精品无人区| www.精华液| 一二三四在线观看免费中文在| 国产精品国产av在线观看| av在线观看视频网站免费| 可以免费在线观看a视频的电影网站 | 捣出白浆h1v1| 国产成人91sexporn| 亚洲精品国产av成人精品| 国产xxxxx性猛交| 亚洲七黄色美女视频| 国产精品三级大全| 一区二区三区激情视频| 不卡视频在线观看欧美| 国产97色在线日韩免费| 一级a爱视频在线免费观看| 久久天堂一区二区三区四区| 精品国产乱码久久久久久小说| 久久韩国三级中文字幕| 男女无遮挡免费网站观看| 日韩av不卡免费在线播放| 精品第一国产精品| 成年av动漫网址| 最近中文字幕2019免费版| 精品午夜福利在线看| 国产精品久久久久久精品电影小说| 久久精品aⅴ一区二区三区四区| 久久免费观看电影| 日韩成人av中文字幕在线观看| 纯流量卡能插随身wifi吗| videosex国产| 男女边吃奶边做爰视频| 丝袜在线中文字幕| 亚洲国产精品一区二区三区在线| 亚洲情色 制服丝袜| 女人被躁到高潮嗷嗷叫费观| 亚洲人成77777在线视频| 精品午夜福利在线看| 久久久久国产精品人妻一区二区| 伦理电影大哥的女人| 日韩一卡2卡3卡4卡2021年| av不卡在线播放| av视频免费观看在线观看| 免费高清在线观看视频在线观看| 99久久综合免费| 亚洲国产毛片av蜜桃av| av在线观看视频网站免费| 亚洲精品av麻豆狂野| 女人高潮潮喷娇喘18禁视频| 母亲3免费完整高清在线观看| xxx大片免费视频| 97人妻天天添夜夜摸| 一本一本久久a久久精品综合妖精| 99精品久久久久人妻精品| 午夜日韩欧美国产| 日韩一区二区视频免费看| 国产精品偷伦视频观看了| 91精品伊人久久大香线蕉| 搡老岳熟女国产| a级毛片在线看网站| 校园人妻丝袜中文字幕| 在线观看一区二区三区激情| 国产精品成人在线| 高清欧美精品videossex| 一区福利在线观看| 少妇被粗大猛烈的视频| www日本在线高清视频| 蜜桃在线观看..| 69精品国产乱码久久久| 免费日韩欧美在线观看| 精品酒店卫生间| 中文字幕色久视频| 一边摸一边做爽爽视频免费| 人体艺术视频欧美日本| 欧美国产精品一级二级三级| 黄色 视频免费看| 精品国产乱码久久久久久男人| 国产精品三级大全| 丝袜在线中文字幕| 日韩人妻精品一区2区三区| 综合色丁香网| 男人添女人高潮全过程视频| 看非洲黑人一级黄片| 2021少妇久久久久久久久久久| 蜜桃在线观看..| 精品国产一区二区久久| 青春草国产在线视频| 免费高清在线观看日韩| 久久综合国产亚洲精品| 亚洲国产看品久久| 精品国产一区二区久久| 精品国产超薄肉色丝袜足j| 久久国产精品大桥未久av| 多毛熟女@视频| 国产成人欧美| 母亲3免费完整高清在线观看| av在线播放精品| 免费少妇av软件| 大香蕉久久成人网| 免费在线观看视频国产中文字幕亚洲 | 一级黄片播放器| 国产欧美亚洲国产| 国产高清国产精品国产三级| 一个人免费看片子| 如日韩欧美国产精品一区二区三区| 一级毛片我不卡| 亚洲人成网站在线观看播放| 亚洲成国产人片在线观看| 国产精品国产三级国产专区5o| 波野结衣二区三区在线| 亚洲av电影在线观看一区二区三区| 三上悠亚av全集在线观看| 高清视频免费观看一区二区| 菩萨蛮人人尽说江南好唐韦庄| 亚洲综合精品二区| 国产精品久久久av美女十八| 一区二区三区精品91| 咕卡用的链子| 亚洲成av片中文字幕在线观看| 国产97色在线日韩免费| 国产欧美日韩一区二区三区在线| 亚洲欧美一区二区三区黑人| 国产1区2区3区精品| 国产精品香港三级国产av潘金莲 | 91精品国产国语对白视频| 久久精品熟女亚洲av麻豆精品| av福利片在线| 亚洲欧美精品综合一区二区三区| 亚洲人成77777在线视频| 国产视频首页在线观看| 国产亚洲精品第一综合不卡| 操出白浆在线播放| 在线观看www视频免费| 精品国产乱码久久久久久男人| 亚洲国产精品一区三区| 日本91视频免费播放| 两性夫妻黄色片| www日本在线高清视频| 国产欧美亚洲国产| 精品一区在线观看国产| 在线观看一区二区三区激情| 性少妇av在线| 久久久久久久国产电影| 青草久久国产| 最近2019中文字幕mv第一页| 51午夜福利影视在线观看| 我的亚洲天堂| 欧美变态另类bdsm刘玥| 亚洲一级一片aⅴ在线观看| 性色av一级| 男女免费视频国产| 99九九在线精品视频| 亚洲精华国产精华液的使用体验| 精品午夜福利在线看| 亚洲国产成人一精品久久久| 日韩一卡2卡3卡4卡2021年| 免费日韩欧美在线观看| 国产av精品麻豆| 91老司机精品| 午夜免费观看性视频| 如日韩欧美国产精品一区二区三区| 在线 av 中文字幕| 欧美日韩亚洲综合一区二区三区_| 精品第一国产精品| 美女中出高潮动态图| 久久久精品国产亚洲av高清涩受| 亚洲国产欧美日韩在线播放| 欧美日韩成人在线一区二区| 女性被躁到高潮视频| 国产欧美亚洲国产| 观看美女的网站| 男人添女人高潮全过程视频| 国产成人欧美在线观看 | 岛国毛片在线播放| 综合色丁香网| 亚洲,欧美精品.| 日韩中文字幕视频在线看片| 日日啪夜夜爽| 少妇人妻 视频| 精品国产超薄肉色丝袜足j| 久久99一区二区三区| 色视频在线一区二区三区| 国产色婷婷99| 免费不卡黄色视频| 国产深夜福利视频在线观看| 日本午夜av视频| 日韩 亚洲 欧美在线| 老司机影院毛片| 久久久久久久精品精品| 熟女av电影| 色综合欧美亚洲国产小说| 九九爱精品视频在线观看| 免费人妻精品一区二区三区视频| 狂野欧美激情性bbbbbb| 欧美在线一区亚洲| 国产精品嫩草影院av在线观看| 90打野战视频偷拍视频| 亚洲色图综合在线观看| 高清视频免费观看一区二区| 国产日韩一区二区三区精品不卡| 80岁老熟妇乱子伦牲交| 国产亚洲欧美精品永久| av在线老鸭窝| 各种免费的搞黄视频| 午夜精品国产一区二区电影| 日本色播在线视频| 亚洲三区欧美一区| 免费高清在线观看视频在线观看| 亚洲五月色婷婷综合| 久久99一区二区三区| 丰满少妇做爰视频| 国产男女超爽视频在线观看| 亚洲精品av麻豆狂野| 黄片小视频在线播放| 中文精品一卡2卡3卡4更新| 亚洲伊人色综图| 免费观看a级毛片全部| 久热爱精品视频在线9| 亚洲欧美一区二区三区黑人| 午夜91福利影院| 看免费成人av毛片| 日本爱情动作片www.在线观看| 久久天堂一区二区三区四区| 亚洲精品国产色婷婷电影| 欧美精品高潮呻吟av久久| 亚洲欧美成人综合另类久久久| 婷婷色av中文字幕| 十八禁人妻一区二区| 一边摸一边抽搐一进一出视频| 天天添夜夜摸| 亚洲欧美一区二区三区久久| 看十八女毛片水多多多| 大片免费播放器 马上看| 啦啦啦 在线观看视频| 久久综合国产亚洲精品| 高清视频免费观看一区二区| 成人18禁高潮啪啪吃奶动态图| 久热这里只有精品99| 中文精品一卡2卡3卡4更新| 国产亚洲av片在线观看秒播厂| 亚洲欧美成人综合另类久久久| 如何舔出高潮| 中文字幕人妻熟女乱码| 悠悠久久av| 国产精品无大码| 国产精品国产三级国产专区5o| a级毛片在线看网站| 中文乱码字字幕精品一区二区三区| 亚洲成人av在线免费| 在线观看免费高清a一片| 亚洲,欧美,日韩| 亚洲国产精品一区三区| 国产毛片在线视频| 久久久久久久精品精品| 岛国毛片在线播放| 99久久综合免费| 久久久久久久久久久免费av| av国产久精品久网站免费入址| 黄色视频不卡| 毛片一级片免费看久久久久| 久久国产精品大桥未久av| 亚洲成人手机| 丝袜美腿诱惑在线| 亚洲自偷自拍图片 自拍| 五月开心婷婷网| 久久 成人 亚洲| 黄色视频不卡| 99久久综合免费| 色94色欧美一区二区| 卡戴珊不雅视频在线播放| 久久鲁丝午夜福利片| 观看美女的网站| 亚洲久久久国产精品| 观看美女的网站| 在线精品无人区一区二区三| 啦啦啦在线免费观看视频4| 捣出白浆h1v1| 热re99久久国产66热| 日韩熟女老妇一区二区性免费视频| 国产成人免费无遮挡视频| 国产一区二区激情短视频 | 成人影院久久| 久久av网站| 丰满迷人的少妇在线观看| 国产又色又爽无遮挡免| 黄片播放在线免费| 黄色一级大片看看| 精品少妇内射三级| 精品国产露脸久久av麻豆| 卡戴珊不雅视频在线播放| 女人久久www免费人成看片| 午夜福利视频精品| 国产精品av久久久久免费| 一本久久精品| 男女下面插进去视频免费观看| 亚洲一区中文字幕在线| 亚洲av国产av综合av卡| 在线观看www视频免费| 如日韩欧美国产精品一区二区三区| 亚洲精品中文字幕在线视频| 日韩精品有码人妻一区| 涩涩av久久男人的天堂| 午夜激情久久久久久久| 热99久久久久精品小说推荐| 国产精品女同一区二区软件| 黄色一级大片看看| 国语对白做爰xxxⅹ性视频网站| 国产av精品麻豆| 亚洲欧美清纯卡通| 午夜福利网站1000一区二区三区| 久久人人爽人人片av| 亚洲人成电影观看| 中文字幕制服av| 久久久精品国产亚洲av高清涩受| 国产一区有黄有色的免费视频| 成人三级做爰电影| 国产又色又爽无遮挡免| 日本av手机在线免费观看| 在线天堂中文资源库| 卡戴珊不雅视频在线播放| 老司机影院毛片| 老司机深夜福利视频在线观看 | 香蕉丝袜av| 欧美国产精品va在线观看不卡| 国产有黄有色有爽视频| 丝袜脚勾引网站| 亚洲一区二区三区欧美精品| 老汉色∧v一级毛片| 国产 一区精品| 久久久久久人妻| 少妇人妻久久综合中文| 精品一区二区三卡| 久久久久精品国产欧美久久久 | 亚洲国产成人一精品久久久| 女人精品久久久久毛片| 欧美av亚洲av综合av国产av | 国产精品二区激情视频| 嫩草影院入口| 在线看a的网站| 丝袜脚勾引网站| 免费高清在线观看视频在线观看| 午夜精品国产一区二区电影| 18禁裸乳无遮挡动漫免费视频| 欧美黑人精品巨大| 亚洲情色 制服丝袜| 欧美激情极品国产一区二区三区| 午夜福利影视在线免费观看| 亚洲国产欧美一区二区综合| 999精品在线视频| 免费在线观看黄色视频的| 丝瓜视频免费看黄片| 中国三级夫妇交换| 国产午夜精品一二区理论片| 色视频在线一区二区三区| 色94色欧美一区二区| 又黄又粗又硬又大视频| 1024视频免费在线观看| 99热全是精品| 又大又黄又爽视频免费| 精品亚洲乱码少妇综合久久| 日韩大片免费观看网站| 在线观看一区二区三区激情| 2018国产大陆天天弄谢| 久久久精品免费免费高清| 欧美国产精品一级二级三级| 亚洲精品一二三| 久久午夜综合久久蜜桃| 亚洲精品美女久久av网站| 高清不卡的av网站| 亚洲成人av在线免费| av电影中文网址| 久久久久国产一级毛片高清牌| 人人妻,人人澡人人爽秒播 | 日本av免费视频播放| 悠悠久久av| 少妇人妻 视频| 男女午夜视频在线观看| 亚洲成国产人片在线观看| 国产又爽黄色视频| 丰满乱子伦码专区| 亚洲久久久国产精品| 啦啦啦中文免费视频观看日本| 岛国毛片在线播放| 日韩欧美精品免费久久| 中文字幕人妻丝袜制服| 又黄又粗又硬又大视频| 男的添女的下面高潮视频| 久久人人爽人人片av| 亚洲美女黄色视频免费看| 女的被弄到高潮叫床怎么办| 久久这里只有精品19| 亚洲成人免费av在线播放| 又粗又硬又长又爽又黄的视频| 久久久精品免费免费高清| 国产精品女同一区二区软件| 午夜福利在线免费观看网站| 最近手机中文字幕大全| 母亲3免费完整高清在线观看| 精品国产超薄肉色丝袜足j| 亚洲一卡2卡3卡4卡5卡精品中文| 老熟女久久久| 777米奇影视久久| 精品人妻在线不人妻| 丰满迷人的少妇在线观看| 欧美日本中文国产一区发布| 亚洲婷婷狠狠爱综合网| 久久99一区二区三区| 亚洲欧美日韩另类电影网站| 男人操女人黄网站| 精品人妻一区二区三区麻豆| 一边亲一边摸免费视频| 欧美老熟妇乱子伦牲交| 丁香六月欧美| 亚洲国产精品一区二区三区在线| 亚洲精品成人av观看孕妇| 国产精品一国产av| 一级爰片在线观看| 天堂8中文在线网| 国产熟女欧美一区二区| 青春草国产在线视频| 性少妇av在线| 国产一卡二卡三卡精品 | 日本黄色日本黄色录像| 国产精品熟女久久久久浪| 欧美精品一区二区免费开放| 天天躁狠狠躁夜夜躁狠狠躁| 9色porny在线观看| 肉色欧美久久久久久久蜜桃| 国产日韩欧美视频二区| e午夜精品久久久久久久| 久久久欧美国产精品| 国产免费视频播放在线视频| 久久久久久久久久久久大奶| 免费黄网站久久成人精品| 中文字幕色久视频| 99国产精品免费福利视频| 夜夜骑夜夜射夜夜干| 欧美亚洲 丝袜 人妻 在线| 97在线人人人人妻| 国产日韩一区二区三区精品不卡| 精品国产露脸久久av麻豆| 亚洲欧美激情在线| 亚洲免费av在线视频| 国产又色又爽无遮挡免| 天天躁日日躁夜夜躁夜夜| 午夜日本视频在线| 亚洲少妇的诱惑av| 国产一区二区 视频在线| 香蕉丝袜av| 妹子高潮喷水视频| 中国三级夫妇交换| 国产精品二区激情视频| www日本在线高清视频| av免费观看日本| 亚洲国产看品久久| 卡戴珊不雅视频在线播放| 一级片免费观看大全| 久久久久久人妻| 黑人猛操日本美女一级片| 午夜福利免费观看在线| 最近2019中文字幕mv第一页| 精品久久久久久电影网| 欧美激情 高清一区二区三区| 亚洲精品国产av成人精品| 91aial.com中文字幕在线观看| 亚洲成人免费av在线播放| 欧美日韩视频高清一区二区三区二| 成年美女黄网站色视频大全免费| 欧美 日韩 精品 国产| 国产精品免费大片| 国产精品一区二区在线观看99| 最近的中文字幕免费完整| 99久久精品国产亚洲精品| 亚洲,欧美精品.| av不卡在线播放| 最黄视频免费看| 日韩欧美一区视频在线观看| 亚洲婷婷狠狠爱综合网| 一区二区三区精品91| 亚洲欧美色中文字幕在线| 久久97久久精品| 亚洲七黄色美女视频| 狠狠精品人妻久久久久久综合| svipshipincom国产片| 成人免费观看视频高清| 少妇 在线观看| 日韩大片免费观看网站| 久久鲁丝午夜福利片| 九色亚洲精品在线播放| e午夜精品久久久久久久| 中文字幕人妻丝袜一区二区 | 欧美人与性动交α欧美精品济南到| 久久国产精品男人的天堂亚洲| 日本av手机在线免费观看| av网站免费在线观看视频| 久久精品国产a三级三级三级| 亚洲欧洲精品一区二区精品久久久 | 性少妇av在线| 99re6热这里在线精品视频| 曰老女人黄片| 一区二区av电影网| 午夜福利,免费看| 亚洲一区中文字幕在线| 日韩制服骚丝袜av| 欧美人与善性xxx| 在现免费观看毛片| 一区二区av电影网| 久久av网站| av女优亚洲男人天堂| 日韩一卡2卡3卡4卡2021年| 亚洲男人天堂网一区| 亚洲欧美中文字幕日韩二区| 99久久精品国产亚洲精品| 十八禁网站网址无遮挡| 最近2019中文字幕mv第一页| 成人国语在线视频| 国产一区二区激情短视频 | 国产片特级美女逼逼视频| 久久这里只有精品19| 深夜精品福利| 国产精品一区二区精品视频观看| 一级毛片 在线播放| 欧美黄色片欧美黄色片| 下体分泌物呈黄色| 最新在线观看一区二区三区 | 欧美日韩亚洲综合一区二区三区_| 悠悠久久av| 国产精品一区二区在线不卡| 国产福利在线免费观看视频| 亚洲av在线观看美女高潮|