摘要
针对H桥级联静止同步补偿器(STATCOM)各模块不一致工作状态下容易导致直流侧电压不平衡的问题,提出了一种新的直流侧电压分级控制方法。分析H桥模块(HBI)级联电平叠加方式,建立起H桥级联STATCOM动态工作特性及电流内环前馈解耦控制策略的数学模型,深入研究了H桥级联STATCOM与电力系统的功率交换机理和正负序电流的特征,在此基础上,运用正序电流控制STATCOM总体电压平衡、负序电流实现STATCOM各相变流电路直流侧间的电压平衡控制,通过调节HBI的交流输出电压幅值和与电流的相位差使各HBI直流侧电容电压维持在设定值。仿真结果验证了所提方法的可行性与正确性。
The inconsistent working status of cascaded STATCOM each H-bridge module can easily give rise to unbalanced DC side voltage. In this paper,a novel hierarchy control method to balance DC link voltage of cascaded STATCOM is proposed,the cascade level overlay mode of H-bridge modules（HBI）is analyzed,and the dynamic characteristics and current inner loop feedforward decoupling mathematical model are constructed,and the power exchange and the positive and negative sequence current features of the H-bridge cascade STATCOM are fully studied. The positive sequence current control is utilized to achieve the overall voltage balance,and the negative sequence current control is employed to achieve voltage balance between phase clusters. For each HBI modules control,by adjusting the phases of H-bridge output voltage and current amplitude and the phase difference to achieve its precise control. The simulation results verified the feasibility and correct ness of the proposed method.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2015年第10期48-55,68,共9页
Proceedings of the CSU-EPSA
基金
湖南省研究生创新基金项目(CX2012D362)
关键词
级联静止同步补偿器
直流侧电压
分级控制
正序电流
负序电流
cascaded static synchronous compensator
DC link voltage
hierarchical control
positive sequence current
negative sequence current
