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为进一步增加大规模风电并网无功补偿容量和解决电压稳定性问题,提出一种基于模块化多电平变换器的静止无功发生器(MMC-STATCOM)。传统的基于前馈解耦的双闭环PI控制器具有整定参数多且复杂,解耦不充分,抗干扰能力差等缺点。研究将内模原理引入到MMC-STATCOM控制系统中,设计解耦控制算法并给出解耦控制模型。内模原理的应用不仅可实现单一参数整定,而且可保留双闭环PI控制器优点。基于内模原理的MMC-STATCOM控制策略能够迅速补偿风电场的无功需要,与传统双闭环控制器相比,具有更好优良性能,系统鲁棒性好,控制精度高,动态响应快。
In order to further increase the capacity of large-scale wind power grid-connected reactive power compensation and solve the problem of voltage stability, a modular multi-level converter based static reactive generator (MMC-STATCOM) is proposed. The traditional double-loop closed-loop PI controller based on feedforward decoupling has the disadvantages of many tuning parameters, complicated, insufficient decoupling and poor anti-interference ability. The research introduces the internal model principle into the MMC-STATCOM control system, designs the decoupling control algorithm and gives the decoupling control model. The application of the internal model principle can not only realize single parameter setting, but also retain the advantages of double closed-loop PI controller. The MMC-STATCOM control strategy based on the internal model can quickly compensate the reactive power of the wind farm. Compared with the traditional double closed-loop controller, the MMC-STATCOM control strategy has better performance, better system robustness, higher control accuracy and faster dynamic response.