基于链式拓扑的SVG可靠性分析和容错控制
首发时间:2016-05-30
摘要:为了保证基于链式拓扑的SVG在发生故障之后仍能正常工作,实现无功补偿。在对系统的可靠性进行分析后,对系统的H桥模块采用容错控制。在容错控制中,每一相有一定数目的H桥模块处于不工作的旁路状态。当发生故障,利用H桥模块化的特点,对发生故障的H桥模块进行切除。为了实现可以旁路或者切除的功能,对每一个H桥模块加了旁路电路。对SVG中的电容电压,在比较了故障前后不变和变化后,采用了冗余轮换的方法,不仅避免了电容电压的变动,而且在正常工作时总体的调制度不会太小。最后在Matlab/Simulink中验证了方法的可行性。
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Reliability analysis and redundance control of SVG based on chain topology
Abstract:In order to make the SVG(Static Var Generator) work and compensate reactive power when the fault occur, the system should be controlled by redundant and fault-tolerant control based on the analysis of system reliability. When the redundant and fault-tolerant control is used,there are some H-bridge cascade will be cut off. Every H-bridge cascade have a bypass device to make every H-bridge cascade can be cut off when it fault. After compating with two control method of capacitor voltage when fault occur,redundant rotation is adopted,which can avoid the change of capacitor voltage and can make sure the modulation degree will not be too low. At last,the simulation in Matlab/Simulink prove the control method is available
Keywords: SVG reliability redundant and fault-tolerant control
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