三相电压不平衡下级联STATCOM的控制方法

发布时间：2018-06-05 15:39

本文选题：三相电压不平衡 + 静止同步补偿器(STATCOM)　；参考：《电力系统自动化》2014年18期

【摘要】：针对三相电压不平衡下级联静止同步补偿器(STATCOM)的控制问题,分析了级联STATCOM在三相电压不平衡时的工作特性,指出可以通过让级联STATCOM输出负序电压的办法来保证接入点的电压平衡。详细推导了系统在正序和负序环境下的解耦控制方程,提出一种新的正序—负序解耦脉宽调制的控制方法,分析了其两种工作模式:无功功率补偿模式和电压控制模式。级联STATCOM上层采用正序—负序解耦控制;下层采用能量平衡的控制策略保证各模块直流侧电容电压平衡。仿真和实验表明,该方法可以有效地解决级联STATCOM在三相电压不平衡下的安全运行问题,使得其在抵御一定的不平衡电压的同时具有较快的无功功率补偿特性,实现其最大化利用。
[Abstract]:Aiming at the control problem of cascaded static synchronous compensator (STATCOM) under unbalance of three-phase voltage, the operating characteristics of cascaded STATCOM under unbalance of three-phase voltage are analyzed. It is pointed out that the voltage balance of the access point can be ensured by using cascaded STATCOM to output negative sequence voltage. The decoupling control equations of the system in both positive and negative sequence environments are derived in detail. A new control method of positive and negative sequence decoupling pulse width modulation is proposed. Two working modes, reactive power compensation mode and voltage control mode, are analyzed. The upper layer of cascade STATCOM is decoupled by positive sequence and negative sequence, and the control strategy of energy balance is adopted in the lower layer to ensure the voltage balance of DC side of each module. Simulation and experiments show that this method can effectively solve the problem of safe operation of cascaded STATCOM under unbalance of three-phase voltage, so that it can resist a certain unbalanced voltage and have faster reactive power compensation characteristics at the same time. To maximize its utilization.
【作者单位】：湖南工业大学电气与信息工程学院;合肥华威自动化有限公司;
【基金】：湖南省重点建设学科项目(201176) 湖南省高校重点实验室项目(2014249) 湖南省高校科技创新团队项目(2014207)
【分类号】：TM761

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