提出了一种能量最优与时间最优相结合的电压暂降补偿器控制策略

Peihong Chen, Zenglu Chen, Yanfang Li
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引用次数: 1

摘要

电压跌落是一个重要的电能质量问题。提高补偿能力是电压暂降补偿器的关键技术。本文首先提出了一种不含储能电容器的无变压器串联电压凹陷拓扑结构。这种拓扑结构通过消除传统串联注入装置中使用的大型注入变压器和储能电容器而具有成本效益。这种拓扑结构既可以用于三相三线系统,也可以用于三相四线系统,并且可以补偿对称三相电压下降到37%,或者如果其他至少一个相位是额定的,则可以补偿一个或两个相位下降到零。其次,提出并说明了一种新的补偿控制策略,该策略将能量最优控制与时间最优控制相结合,以扩大补偿时间,并在下降时从补偿器获取最小的能量。然后,提出了一种渐近角度旋转方法,以避免负载侧电压的突然跳相。仿真结果证明了该方法具有良好的性能。
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A novel control strategy combined by both of energy optimal and time optimal control for voltage sag compensator
Voltage sags are an important power quality problem. Enhancing compensating capability is the key technique in voltage sag compensators. In this paper, a transformer-less series voltage sag topology without energy storage capacitors is proposed first. This topology is cost-effective by eliminating the large injection transformer and energy storage capacitors that are used in conventional series injection devices. This topology can both be used in three-phase three-line and three-phase four-line systems, and can compensate symmetrical three-phase voltage sags down to 37%, or one or two phase sags down to zero if others at least one phase is rated. Secondly, this paper proposes and illustrates a new compensation control strategy which combines energy optimal control with time optimal control to enlarge the compensating time and draw a minimum amount of energy from the compensator during sags. And then, an asymptotically angle rotation method is proposed to avoid sudden phase jump of the load-side voltage. Simulation results demonstrate the good features.
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