National Key R&D Plan(2016YFC0600906); the Mine electric power monitoring system(11991131)
针对不平衡电网下并联混合有源电力滤波器APF（active power filter）和无功补偿装置体积过大和系统损耗的问题，提出一种在不平衡电网下的静止无功发生器SVG（static var generator）和APF并直流母线联合运行系统。其中，SVG主要用来快速补偿无功和电网不平衡，APF滤出电网和SVG的特定次谐波。该联合系统通过并直流母线减小了电容的体积，使系统总体积减小；降低SVG的开关频率使系统损耗减少。对系统环流抑制策略进行了分析，确定了在从模块上加入环流进行抑制环节，并解决了并联系统中出现的环流问题。最后通过Matlab/Simulink仿真验证了该联合系统的可行性。
Aimed at the problem of excessive volume and large system loss in a parallel hybrid active power filter(APF) and reactive power compensation device under unbalanced grid, a common DC bus joint operation system of a static var generator(SVG) and an APF under unbalanced power grid is proposed, in which the SVG is mainly used to qui-ckly compensate the reactive power and power grid imbalance while the APF filters out the specific sub-harmonics of power grid and the SVG. Through the common DC bus, the joint system reduces the capacitor volume, thereby reducing the system's total volume. In addition, it reduces the switching frequency of the SVG, which decreases the system loss. The circulating current suppression strategy for the system is analyzed, and a circulation module is added to the suppression link, which solves the circulation problem in the parallel system. Finally, the feasibility of the joint system is verified by Matlab/Simulink simulations.