注入式有源谐波电阻谐振抑制方法

微电网的电压等级逐步向中压发展。为了补偿微网中大量无功功率的传输,在中压配电网中一般加设无功补偿电容。无功补偿电容有可能导致电网谐波电流放大,严重的谐振问题会危及配电网的安全。首先,利用谐振模态分析法对中压配网的谐振进行分析;然后,基于注入式结构的有源谐波电阻AHR(active harmonic resistance),建立电压控制电流源方式下有源谐波电阻的阻抗模型,分析其对谐振阻尼的作用。仿真和实验结果证明了所提出的谐振分析与抑制方法对谐振有明确的预测与阻尼作用,可以有效保障系统的正常运行。

Harmonic Resonance Suppression Method Based on Injected Active Harmonic Resistance

Nowadays, the voltage level of microgrid is developing towards medium-level progressively. To compensate the transmission of a large quantity of reactive power, reactive compensation capacitors are usually installed in medium-voltage distribution networks, which will amplify the harmonic current in the grid and even endanger the distribution network in the case of serious resonance problems. In this paper, harmonic resonance modal analysis method is used to analyze the harmonics in a medium-voltage distribution network at first. Then, based on the injected active harmonic resistance(AHR), a impedance model of AHR in voltage-controlled-current mode is set up, and its effect on the har-monic resonance damp is analyzed. Simulation and experimental results proved that the proposed harmonic resonance analysis and suppression method can predict and damp the harmonic resonance obviously, which can guarantee the normal operation of the system effectively.