在高压大功率应用场合,链式静止同步补偿器(STATCOM)具有诸多优点,同时可结合有源电力滤波技术抑制特定次谐波,因此得到广泛应用.受补偿装置额定容量限制,对于更大的补偿需求,需更大装置容量来满足.分析了链式STATCOM在运行中时常出现指令电流超出装置额定电流的状况,提出目标功率因数和优先级限流相结合的控制策略.根据用户需求,设定功率因数,对无功电流限流输出,进而提高谐波补偿性能.当指令电流仍然过大时,对各次谐波电流设定优先级,使低次谐波电流得到优先补偿.最后验证了所提策略的有效性.%In the case of high voltage and power applications,the cascade static synchronous compensator(STATCOM) has the advantages and can combine with active power filter technology to inhibit the specific harmonic,so it is widely used.Due to the limitation of the rapacity capacity of the compensation device,greater device capacity is required for greater compensation requirements.The condition that the instruction current exceeds the rated current of the device,which occur often in operation,is analyzed in detail,the control strategies combining the target power factor and the priority current limiting are proposed.According to the demand of the user,the power factor is set and the output value of reactive current is limited to improve the harmonic compensation performance.When the instruction current is still too large,a priority of compensation is set to make the low harmonic current priority compensation.Finally,the effectiveness of the method is verified.
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