随着电压等级提高、输送功率增大,系统无功功率变化更加频繁,不利于熄弧,输电线路安全稳定运行受到严重威胁.基于交直流混合无功补偿线路研究了混合无功补偿装置(hybrid reactive power compensation,HRPC)补偿度对潜供电流与恢复电压影响,分析分级可控高抗与小电抗联动控制的措施对潜供电弧抑制效果,提出一种改进型旁路断路器时序控制策略.结果表明,串补度20%、补偿度70%及小电抗700 mH时,潜供电流与恢复电压幅值最小,抑制效果最佳.此外,采用潜供电弧熄灭后旁路断路器断开的控制策略能够进一步加快熄弧速率,提高单相重合闸成功率.研究成果为HRPC在远距离大容量混联线路中应用提供理论依据和技术支撑.
Suppression Measures for Submarine Arc in AC/DC Hybrid Transmission Lines Based on Hybrid Reactive Power Compensation
With the increase of voltage level and transmission power,the reactive power of the system changes more frequently,which is not conducive to arc extinguishing and seriously threatens to the safe and stable operation of transmission lines.Based on the AC/DC hybrid reactive power compensation(HRPC)line,the influence of the compensation degree of the hybrid reactive power compensation(HRPC)device on the submarine current and recovery voltage is studied.The measures of hierarchical controllable high reactance and small reactance linkage control are analyzed to suppress the submarine arc,and an improved timing control strategy for bypass circuit breakers is proposed.The results show that when the series compensation degree is 20%,the compensation degree is 70%,and the small reactance is 700 mH,the amplitude of the submarine current and recovery voltage is the smallest,and the suppression effect is the best.In addition,the control strategy of using the bypass circuit breaker to disconnect after the extinguishing of the submarine arc can further accelerate the extinguishing rate and improve the success rate of single-phase reclosing.The research results provide theoretical basis and technical support for the application of HRPC in long-distance high-capacity hybrid transmission lines.
hybrid reactive power compensation deviceAC/DC hybrid transmission linesubmarine arctiming control strategy for bypass circuit breakers
万方数据
维普
