摘要
D-STATCOM具有良好的无功补偿和谐波抑制能力,在电力系统中得到广泛运用。D-STATCOM并网运行时会放大负载谐波电流,限制了D-STATCOM的使用范围。为充分发挥D-STATCOM的优越性能,减小其对负载谐波电流的放大效应,利用等效电路方法对D-STATCOM补偿非线性负载系统进行分析。对于电压源型非线性负载,等效阻抗随谐波次数的增加急剧减小使谐波放大效应更加严重。采用串联电抗器的方法能有效降低负载高次谐波的等效阻抗,从而抑制谐波放大效应。Matlab仿真结果表明:受谐波放大效应的影响,若不采取限制负载高次谐波的措施D-STACOM补偿效果较差,串联电抗器能有效抑制谐波放大效应,显著提高DSTATCOM补偿性能。
D-STATCOM is wildly used in power system for its good ability to compensate reactive power and suppress harmonic. D-STATCOM paralleling operation may amplify the load harmonic current. Thus its usage is confined. In order to enhance its good performance and reduce its amplification effect on load harmonic current,the D-STATCOM compensating nonlinear load system was analyzed by circuit equivalence. For the voltage-source type nonlinear loads,the harmonic equivalent impedance sharply decreases with the increase of harmonic orders,so the harmonic amplification effect becomes more serious. Series rector can reduce harmonic equivalent independence,thus,harmonic amplification effect can be suppressed. Matlab simulation result shows D-STATCOM may not work without additional measurement by the influence of harmonic amplification. The series reactor can suppress the harmonic amplification effect and improve D-STATCOM performance efficiently.
出处
《电测与仪表》
北大核心
2016年第7期21-25,共5页
Electrical Measurement & Instrumentation
