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针对分布式并网发电中特别是光伏发电设备在夜晚情况下和风力发电设备在无风情况下利用率低,以及有源电力滤波器(APF)成本高、功能单一这一问题,提出了一种分布式并网发电装置的新型复合控制策略,它能在分布式电源最佳功率并网输出的情况下,同时实现电网谐波和无功电流补偿。详细分析了控制系统的结构,并采用改进的谐波及无功检测和并网有功指令电流合成算法及新型复合控制方法,改进算法省去了三相至两相坐标变换及其逆变换,计算量小,检测精度高,而新型复合控制根据自适应滞环比较器中的滞环宽度可随各参数变化而自动调节,重复控制器能保证在周期性负载扰动下稳态精度较高的特点,相应切换控制模式,大大改善了含分布式电源电网的电能质量,提高了电力系统的稳定性,并节省了设备投资。最后,利用Matlab/Simulink仿真验证了该新型复合控制策略的正确性和可行性。
Aiming at the problem of low utilization rate of wind power generation equipment in the case of distributed grid-connected power generation, especially in the case of photovoltaic power generation equipment in the absence of wind and the high cost of active power filter (APF) and single function, a A new composite control strategy for distributed grid-connected power generation devices can simultaneously achieve grid harmonic and reactive current compensation at the same power output of distributed generation. The structure of the control system is analyzed in detail, and the improved harmonics and reactive power detection and the grid-connected active command current synthesis algorithm and the new compound control method are adopted. The improved algorithm eliminates the need of three-phase to two-phase coordinate transformation and its inverse transformation. Small amount and high detection precision. The new composite control can automatically adjust according to the hysteresis width of the adaptive hysteresis comparator with the change of each parameter, and the repetitive controller can ensure the steady-state precision under the periodic load disturbance , The corresponding switching control mode greatly improves the power quality of the distributed power grid, improves the stability of the power system and saves the equipment investment. Finally, the correctness and feasibility of the new composite control strategy are verified by Matlab / Simulink simulation.