i_p-i_q检测法的单周控制三电平有源电力滤波器

并联型有源电力滤波器APF可以有效补偿由非线性负载产生的谐波和无功功率电流。为了实现单独对谐波分量、无功功率分量进行补偿,或者对谐波和无功功率分量同时进行补偿这些不同的补偿目标,同时为了满足大功率、高电压和输出电流波形畸变小的需要,提出了将中点箝位变换器和ip-iq电流检测法应用于单周控制有源电力滤波器的方法。采用ip-iq电流检测算法可分离出负载电流中的谐波分量、无功功率分量,且电网电压波形畸变不影响检测结果,故可提供不同补偿目标的参考信号。理论推导和仿真结果表明,该法能分别单独补偿谐波分量、无功功率分量,或者同时补偿谐波和无功功率分量,而且电网电压波形畸变不影响补偿效果。通过将ip-iq电流检测法运用于单周控制三电平有源电力滤波器,既实现多种补偿目标,又具有电网电压波形畸变不影响补偿效果、单周控制策略简单、三电平变换器输出电流波形畸变小的优点。

One-cycle Controlled Three-level Active Power Filter with the ip-iq Detecting Method

A shunt active power filter(APF)is a device that compensates reactive power and harmonic currents from a group of nonlinear loads.In order to not only compensate harmonic component,reactive power component,both harmonic and reactive power component,respectively,but also apply APF to higher voltage,higher power and lower distortion of output current waveform applications,a one-cycle controlled APF with neutral-point-clamped(NPC)converter and the ip-iq detecting method is presented for the first time.With the ip-iq detecting algorithm,reference signals for different compensation objectives are generated by calculating load harmonic component and reactive power component,respectively.The theoretical analysis and circuit simulation results verify that this APF can fulfill harmonics compensation,reactive power elimination,both harmonic and reactive power component compensation effectively.In addition,there is no influence on compensating results under distorted voltage circumstance.Therefore,applying the ip-iq detecting method to one-cycle controlled three-level APF has merits of multiple compensating objectives,no influence on compensating results,simplicity of one-cycle control strategy and lower distortion of output current waveform.