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Research on the virtual synchronous generator control strategy of grid-connected permanent-magnet direct-driven wind power system

机译：并网永磁直驱风力发电系统虚拟同步发电机控制策略研究

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摘要

Renewable energy, distributed generation, and micro-grid technology have been widely concerned for a long time. The traditional grid-connected inverter control strategy does not take into account the problem of inertia which is short and fast to cause the frequency change. The virtual synchronous generator control strategy is adopted to simulate the synchronous generator characteristics, which enhanced the inertia and damp of the system. For the micro-grid of wind power grid-connected, the storage battery is arranged on the AC side of the permanent magnet direct-drive wind turbine, and the model of the virtual synchronous generator is established. Thus the grid-connected performance of large-scale wind farm is improved. Here, the effect of moment of inertia in the virtual synchronous generator and the grid-connected regulation of virtual synchronous generator are verified by using PSCAD/EMTDC. The simulation results show that the grid-connected inverter controlled by the virtual synchronous generator is approximately equivalent to the synchronous generator in external characteristic. The grid-connected inverter based virtual synchronous generator control has a beneficial to adjust frequency and voltage, and can enhance the standby inertia of new energy and grid power generation.
机译：长期以来，可再生能源，分布式发电和微电网技术一直受到广泛关注。传统的并网逆变器控制策略没有考虑惯性问题，惯性问题短而又快，会引起频率变化。采用虚拟同步发电机控制策略对同步发电机特性进行仿真，增强了系统的惯性和阻尼。对于并网的风力发电微电网，将蓄电池布置在永磁直驱风力发电机的交流侧，建立了虚拟同步发电机的模型。因此，提高了大型风电场的并网性能。在此，通过使用PSCAD / EMTDC验证了虚拟同步发电机中的惯性矩的影响以及虚拟同步发电机的并网调节。仿真结果表明，虚拟同步发电机控制的并网逆变器在外部特性上近似于同步发电机。基于并网逆变器的虚拟同步发电机控制具有调节频率和电压的优势，并且可以增强新能源和电网发电的待机惯量。

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