Abstract ——This article deals with a phase-locked loop (PLL)- based novel control for wind turbine driven doubly fed induction generator interfaced to utility grid with a battery energy storage (BES) connected at the dc link. The control of grid-side converter (GSC) is modified to export/import constant power to/from the grid. The state of charge of BES helps in deciding the reference export power to the grid apart from the manual selection using averaged wind power in a particular period of time. An off maximum power point tracking logic is incorporated in the rotor-side converter (RSC) control to operate the BES within its constraints and, moreover, to feed constant power to the grid. In addition, the energy management scheme of the system is presented in the form of flowchart for both exporting and importing power to/from the grid. The RSC and GSC have taken care of unity power factor operation at stator terminals and to mitigate harmonics and grid currents balancing, respectively. The system performance is found robust as the PLL response is not affected even under grid voltages with dc offset. The system is modeled and simulations are carried out in MATLAB using SimPowerSystems tool box. Moreover, the control scheme performance is compared with conventional control algorithms both in terms of PLL and converter controls. To validate the effectiveness of the control scheme, a prototype of the system is developed. Test results demonstrate the satisfactory performance of the system under various operating conditions.

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双馈感应风力发电机直接功率控制负载并网控制策略，蔚兰，宋小亮，传统的风力发电并网方式在并网瞬间可能会产生较大的冲击电流，为了改善并网效果，达到柔性并网的要求，本文根据交流励磁变速恒频

LCL型并网逆变器作为可再生新能源发电单元与电网之间的能量接口，用于直流电转化为高质量的交流电并并网。本书主要讲解LCL型并网逆变器控制技术。

单相逆变器并网控制和有源频率偏移孤岛检测Simulink仿真-afd1.m 单相光伏并网发电系统电压前馈控制和有源频率偏移（AFD）孤岛检测法的simulink仿真模型，初步实现了并网电流与电网电压的同频同相，AFD孤岛检测方法采用S函数给出，检测功能基本实现。 AFD1.mdl simulink模型 afd1.m AFD法S函数 孤岛检测电压电流波形.png 孤岛检测电压电流波形

为提高基于大容量直驱式永磁同步风力发电系统的大功率风电并网的可靠性,设计了风电并网三电平全功率变流器。主要是利用传统并网控制技术即基于电网电压定向的电压、电流双闭环矢量控制策略,采用双PWM控制技术对三电平全功率变流器进行控制,以实现对有功和无功的解耦控制。运用Matlab/Simulink仿真软件进行风电并网系统仿真,仿真结果表明:三电平全功率变流器可有效改善风电大功率并网质量。

三相DC-AC变流器功率控制并网控制PLECS仿真

三相DC-AC变流器电压控制并网控制PLECS仿真

三相DC-AC变流器并网控制PLECS仿真