CAJ | 학술논문

针对并联接入系统的电压型逆变器提出一种专用于抑制次同步振荡的次同步电压调制策略.基于复转矩系数法推导了采用该方式抑制由串补引发的次同步谐振时提供的近似电气阻尼.分析结果表明,当接入点系统电压与电压型逆变器输出的次同步电压之间的相位差满足一定条件时,可使得逆变器提供正的电气阻尼.分析了影响此正的电气阻尼大小的相关因素.利用dq变换对电压型逆变器的控制器进行了设计,通过解耦控制,实现了抑制次同步振荡、维持逆变器直流侧电压的目的.测试信号法及时域仿真法的仿真结果表明,这种基于并联电压型逆变器的次同步电压调制策略能够有效阻尼系统的次同步振荡.
침대병련접입계통적전압형역변기제출일충전용우억제차동보진탕적차동보전압조제책략.기우복전구계수법추도료채용해방식억제유천보인발적차동보해진시제공적근사전기조니.분석결과표명,당접입점계통전압여전압형역변기수출적차동보전압지간적상위차만족일정조건시,가사득역변기제공정적전기조니.분석료영향차정적전기조니대소적상관인소.이용dq변환대전압형역변기적공제기진행료설계,통과해우공제,실현료억제차동보진탕、유지역변기직류측전압적목적.측시신호법급시역방진법적방진결과표명,저충기우병련전압형역변기적차동보전압조제책략능구유효조니계통적차동보진탕.
@@@@Subsynchronous voltage modulation strategy for voltage source inverter (VSI) in parallel with system is presented, which is exclusively for subsynchronous oscillation (SSO) mitigation use. Approximate electrical damping provided by the strategy for suppressing subsynchronous resonance (SSR) induced by fixed series capacitor (FSC) is formulated by complex torque coefficient approach. The analysis result demonstrates that when the phase difference between system voltage of access point and subsynchronous voltage output of VSI satisfies some condition, VSI can provide positive electrical damping. And the related elements which influence the size of this positive electrical damping are analyzed. The controller of VSI is designed by dq transformation, which can mitigate SSO and maintain voltage on DC side of inverter by decoupled control. The simulation result with the methods of test signal and time domain simulation reveals that the subsynchronous voltage modulation strategy based on VSI in parallel can damp SSO effectively.