主从结构下储能变流器并联运行建模与附加控制

Modelling and Additional Control for Parallel Operation of Power Converters in ESS under Master-slave Scheme

为提高系统的可靠性,实现储能变流器并联系统容量的灵活配置。本文首先建立了传统主从控制下独立交流微电网的状态空间模型,分析了主要控制与通信参数对系统稳定性的影响。其次,针对负荷扰动过程中从机功率跟踪较慢的问题,提出了一种附加的从机控制策略以增强系统承担负荷扰动的能力;针对交流微电网带负载黑启动的问题,提出了一种主从结构下的黑启动协调控制策略。最后,仿真和实验验证了建模的正确性与所提控制方法的有效性。

To improve the system reliability and realize the flexible configuration of the capacity of a parallel system of power converters in energy storage system(ESS),a state space model of independent AC microgrid under the tradition⁃al master-slave control is established at first,and the influence of main control and communication parameters on sys⁃tem stability is analyzed.Second,aimed at the problem of slow power tracking of slave converters during the load pertur⁃bation,an additional control strategy is proposed for the slave converters to enhance the system’s capability to bear load perturbation.In addition,for the black-start problem of AC microgrid with connected load,a black-start coordinat⁃ed control strategy under the master-slave scheme is put forward.Finally,simulation and experimental results verified the accuracy of modelling and the feasibility of the proposed control method.