【摘要】 提出一种低成本混合型无功补偿系统(hybrid var compensator,HVC),它由一台较小容量的静止无功发生器(staticsynchronous compensa tor,STATCOM)和较大容量的多组晶闸管投切电容器(thyristor switched capacitor,TSC)构成,其中STATCOM用以实现快速连续无功调节,TSC实现无功的大容量分级调节,二者协同工作使HVC系统兼具STATCOM快速连续无功补偿及TSC低成本大容量无功补偿的优势,实现低成本大容量的无功连续补偿。在分析HVC基本工作原理的基础上,提出基于专家决策的HVC协调控制方法,实现离散子系统TSC和连续子系统STATCOM的协调控制,确保HVC能进行快速大容量的无功补偿,针对传统的STATCOM串级电压控制器中调节器多、控制器参数难以设计的缺点,提出基于瞬时功率平衡的电压控制策略,以降低STATCOM控制复杂度,提高可靠性,使系统更易于实现。仿真及现场应用结果证明HVC能够实现无级连续无功补偿,并且成本低,在满足高电耗企业节能降耗需求的基础上,为应用单位减少了投资。更多还原

【Abstract】 A low cost hybrid var compensator is proposed in this paper, it is composed of a small capacity static synchronous compensator and multi-groups thyristor switched capacitor. Static synchronous compensator (STATCOM) is used to realize fast and stepless reactive power compensation and multi-groups thyristor switched capacitor (TSC) are used to realize large capacity step compensation, the coordinative operation of STATCOM and TSC can realized low cost, large capacity and stepless reactive power compensation. Based on the analysis on the principle of hybrid var compensator (HVC), hybrid control method based on expert decision-making is proposed to realized the coordinated control of the continuous subsystem STATCOM and discrete subsystem TSC, it guarantees the performance of HVC, furthermore, a novel voltage control strategy based on instantaneous power balance is proposed to optimize the controller of STATCOM, it is more reliable and easier to realize than traditional cascaded voltage controller. Simulation and application results have shown the validity of the proposed system, it can satisfy the need of energy saving of application companies and save large amount of cost.更多还原