Maximizing the power capture is an important issue to the turbines that are installed in low wind speed area. In this paper, we focused on the modeling and control of variable speed wind turbine that is composed of tw...Maximizing the power capture is an important issue to the turbines that are installed in low wind speed area. In this paper, we focused on the modeling and control of variable speed wind turbine that is composed of two-mass drive train, a Squirrel Cage Induction Generator (SCIG), and voltage source converter control by Space Vector Pulse Width Modulation (SPVWM). To achieve Maximum Power Point Tracking (MPPT), the reference speed to the generator is searched via Extremum Seeking Control (ESC). ESC was designed for wind turbine region II operation based on dither-modulation scheme. ESC is a model-free method that has the ability to increase the captured power in real time under turbulent wind without any requirement for wind measurements. The controller is designed in two loops. In the outer loop, ESC is used to set a desired reference speed to PI controller to regulate the speed of the generator and extract the maximum electrical power. The inner control loop is based on Indirect Field Orientation Control (IFOC) to decouple the currents. Finally, Particle Swarm Optimization (PSO) is used to obtain the optimal PI parameters. Simulation and control of the system have been accomplished using MATLAB/Simulink 2014.展开更多
Wind energy （WE） has become immensely popular for distributed generation （DG）. This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric ...Wind energy （WE） has become immensely popular for distributed generation （DG）. This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric grid interfacing custom power device （CPD） is controlled to perform the smart exchanging of electric power as per the Indian grid code. WE is connected to DC link of CPD for the grid integration purpose. The CPD based distributed static compensator, i.e. the distributed static synchronous compensator （DSTATCOM）, is utilized for injecting the wind power to the point of common coupling （PCC） and also acts against the reactive power demand. The novel indirect current control scheme of DSTATCOM regulates the power import and export between the WE and the electric grid system. It also acts as a compensator and performs both the key features simultaneously. Hence, the penetration of additional generated WE power to the grid is increased by 20% to 25%. The burden of reactive power compensation from grid is reduced by DSTATCOM. The modeling and simulation are done in MATLAB. The results are validated and verified.展开更多
为比较间接功率控制(indirect power control,IPC)和直接功率控制(direct power control,DPC)的控制特点,提出了双馈感应发电机(doubly-fed induction generator,DFIG)的间接功率控制(IPC)和直接功率控制(DPC)策略。首先提出采用空间矢...为比较间接功率控制(indirect power control,IPC)和直接功率控制(direct power control,DPC)的控制特点,提出了双馈感应发电机(doubly-fed induction generator,DFIG)的间接功率控制(IPC)和直接功率控制(DPC)策略。首先提出采用空间矢量调制(space vector modulation,SVM)的SVM-IPC策略,该策略通过对转子电流的直接控制间接实现对定子有功和无功功率的解耦控制;其次提出基于SVM的SVM-DPC策略,该策略不通过电流控制环节,直接实现定子有功功率和无功功率的解耦控制。分析结果表明,SVM-IPC具有良好的稳态性能,但动态响应能力取决于PI参数的优化程度;SVM-DPC不仅稳态性能好,而且具有快速的动态响应能力。实验结果验证了提出策略的可行性和正确性。展开更多
文摘Maximizing the power capture is an important issue to the turbines that are installed in low wind speed area. In this paper, we focused on the modeling and control of variable speed wind turbine that is composed of two-mass drive train, a Squirrel Cage Induction Generator (SCIG), and voltage source converter control by Space Vector Pulse Width Modulation (SPVWM). To achieve Maximum Power Point Tracking (MPPT), the reference speed to the generator is searched via Extremum Seeking Control (ESC). ESC was designed for wind turbine region II operation based on dither-modulation scheme. ESC is a model-free method that has the ability to increase the captured power in real time under turbulent wind without any requirement for wind measurements. The controller is designed in two loops. In the outer loop, ESC is used to set a desired reference speed to PI controller to regulate the speed of the generator and extract the maximum electrical power. The inner control loop is based on Indirect Field Orientation Control (IFOC) to decouple the currents. Finally, Particle Swarm Optimization (PSO) is used to obtain the optimal PI parameters. Simulation and control of the system have been accomplished using MATLAB/Simulink 2014.
文摘Wind energy （WE） has become immensely popular for distributed generation （DG）. This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric grid interfacing custom power device （CPD） is controlled to perform the smart exchanging of electric power as per the Indian grid code. WE is connected to DC link of CPD for the grid integration purpose. The CPD based distributed static compensator, i.e. the distributed static synchronous compensator （DSTATCOM）, is utilized for injecting the wind power to the point of common coupling （PCC） and also acts against the reactive power demand. The novel indirect current control scheme of DSTATCOM regulates the power import and export between the WE and the electric grid system. It also acts as a compensator and performs both the key features simultaneously. Hence, the penetration of additional generated WE power to the grid is increased by 20% to 25%. The burden of reactive power compensation from grid is reduced by DSTATCOM. The modeling and simulation are done in MATLAB. The results are validated and verified.
文摘为比较间接功率控制(indirect power control,IPC)和直接功率控制(direct power control,DPC)的控制特点,提出了双馈感应发电机(doubly-fed induction generator,DFIG)的间接功率控制(IPC)和直接功率控制(DPC)策略。首先提出采用空间矢量调制(space vector modulation,SVM)的SVM-IPC策略,该策略通过对转子电流的直接控制间接实现对定子有功和无功功率的解耦控制;其次提出基于SVM的SVM-DPC策略,该策略不通过电流控制环节,直接实现定子有功功率和无功功率的解耦控制。分析结果表明,SVM-IPC具有良好的稳态性能,但动态响应能力取决于PI参数的优化程度;SVM-DPC不仅稳态性能好,而且具有快速的动态响应能力。实验结果验证了提出策略的可行性和正确性。
