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| 摘要: |
| 对一个包含静止同步串联补偿器(SSSC)的纯感性线路的三相系统,计算了基于六脉波电压源逆变器(VSI)的SSSC在感性、容性补偿方式下一周期内的交、直流侧电流及直流电容电压;结合PSCAD/EMTDC电磁暂态仿真,全面分析了电流对直流电容充放电的影响、开关器件导通周期。计算、仿真及分析结果表明当SSSC注入的串联可控电压与线路电流正交时,电容电流对电容的充放电不起作用,SSSC与系统间仅交换无功;当不完全正交时,电容电流影响电容的充放电,SSSC与系统间不仅交换无功,亦交换有功。 |
| 关键词: 六脉波电压源逆变器,静止同步串联补偿器,直流电容电压控制 |
| DOI： |
| 分类号:TM464 |
| 基金项目:国家重点基础研究发展计划(973计划)(2004CB217907)~~ |
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| Mechanism of DC capacitor voltage control of 6- pulse VSI- based SSSC |
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DING Guan-jun DING Ming TANG Guang-fu
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| Abstract: |
| For a three-phase power system of inductive lines with SSSC(Static Synchronous Series Compensator),the AC and DC currents in one period,as well as the DC capacitor voltage,of the SSSC based on six-pulse VSI(Voltage Sourced Inverter) are calculated for both inductive and capacitive compensation modes.Combined with PSCAD / EMTDC electromagnetic transient simulation,the impact of currents on the charging and discharging of DC capacitor and the conductive period of its switching devices are analyzed.The calculative,simulative and analytic results show that,when the controllable serial voltage injected by SSSC is perpendicular to line current,the capacitor current has no effect on the charging and discharging of capacitor,and there is only reactive power exchange between SSSC and system;when the controllable serial voltage injected by SSSC is incompletely perpendicular to line current,the capacitor current has effect on the charging and discharging of capacitor,and there are both reactive and active power exchanges between SSSC and system. |
| Key words: six-pulse VSI,SSSC,DC capacitor voltage control |
