摘要
采用移相载波调制算法的链式静止同步补偿器(STATCOM)每相各链节之间交流输出电压中同频次谐波分量存在相位差,当电网中存在相应频次的电压谐波并使得STATCOM产生谐波电流时,会造成各链节与系统之间交换幅值不同的谐波有功。当STATCOM在低载输出工况时,由于链节直流电压均衡控制策略效果的弱化,使得谐波有功对链节直流电压的影响增大,这时差异化的谐波有功会使得链节间直流电压逐渐发散,并使得设备失稳。这里分析了采用移相载波调制算法的链式STATCOM在系统电压存在谐波情况下各链节谐波有功的差异,指出了链节直流电压均衡策略对此问题的缺陷,提出对应的解决策略,在PSCAD/EMTDC环境中进行了仿真验证,并在实际工程应用中有效解决了相关问题。
Output harmonic voltage between links of cascaded static synchronous compensator（STATCOM） by using muhi- carrier horizontal phase-shifting modulation exist phase difference.When power system has harmonic voltage,STATCOM will output corresponding frequency harmonic current, it will cause different active power exchange between links and system.Then the voltages of links will gradually diverge, when STATCOM under low load output condition, due to the direct current link voltage balance control strategy＇s weakness.The effect of system voltage harmonics to STATCOM links＇ direct current voltages balancing is analyzed, a corresponding solution strategy is given, and the simulation confir- mation in PSCAD/EMTDC is carried out.In practical engineering application, the related problems are solved effectively.
出处
《电力电子技术》
CSCD
北大核心
2016年第8期31-34,共4页
Power Electronics
关键词
静止同步补偿器
均压
谐波
载波移相
static synchronous compensator
voltages balancing
harmonics
carrier horizontal phase-shifting
