基于同步坐标变换的新型单相谐波电流检测方法研究
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摘要
为了避免与检测量相正交的相量虚构不准确及减小谐波含量最高的某次谐波对传统DQ谐波检测方法的影响,提出一种新型结构的单相谐波电流检测方法。该方法无需虚构与待检测量相正交的矢量,避免了正交相量虚构不准确对检测精度的影响,还利用低通滤波环节得到的直流量进行反馈迭代运算来降低基波和其中含量最高的某次谐波对结果的影响。此外,该方法还能根据待测量的谐波组成情况,动态调整反馈迭代修正部分,具有很高的灵活性。仿真结果表明,当非线性负载类型为不可控整流桥接并联阻容型负载时,使用经典DQ谐波检测方法补偿后电网电流THD为3.15%,使用提出的新型检测方法补偿后THD为1.29%。实验结果与仿真结果具有较好的一致性。
In order to avoid the inaccuracy of the fictional phasor which is orthogonal to the detected phasor and to reduce the effect of the harmonic with the highest content on the traditional DQ harmonic detection method,this paper proposes a new structure of single-phase harmonic current detection method.It does not need to construct a vector orthogonal to the detected vector,which avoids the influence of the inaccurate orthogonal phasor fidelity on the detection precision.Besides,the influence of the fundamental wave and the harmonic with the highest content on the result can be reduced,with this method uses the DC component obtained by the low-pass filtering link to perform feedback iterative operation.In addition,the method can dynamically adjust the feedback iterative correction part according to the harmonic composition to be measured,which has high flexibility.The simulation results show that when the nonlinear load type is an uncontrollable rectifier bridge in paralleled with RC load,the THD is 3.15% applying the classic DQ harmonic detection method and the THD is 1.29% applying the new detection method proposed in this paper.The experimence results accord well with the simulation results.
In order to avoid the inaccuracy of the fictional phasor which is orthogonal to the detected phasor and to reduce the effect of the harmonic with the highest content on the traditional DQ harmonic detection method,this paper proposes a new structure of single-phase harmonic current detection method.It does not need to construct a vector orthogonal to the detected vector,which avoids the influence of the inaccurate orthogonal phasor fidelity on the detection precision.Besides,the influence of the fundamental wave and the harmonic with the highest content on the result can be reduced,with this method uses the DC component obtained by the low-pass filtering link to perform feedback iterative operation.In addition,the method can dynamically adjust the feedback iterative correction part according to the harmonic composition to be measured,which has high flexibility.The simulation results show that when the nonlinear load type is an uncontrollable rectifier bridge in paralleled with RC load,the THD is 3.15% applying the classic DQ harmonic detection method and the THD is 1.29% applying the new detection method proposed in this paper.The experimence results accord well with the simulation results.
引文
[1]王兆安.谐波抑制和无功功率补偿[M].3版.机械工业出版社,2016
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[2]刘晓洁.并联型有源电力滤波器的关键技术研究[D].上海:东华大学,2010
[3]王月,徐千鸣.单同步旋转坐标系下APF的谐波快速重复控制[J].电力电子技术,2017(5):57-60
[4]Kim J S,Kim Y S.A New Control Method for a Single-Phase Hybrid Active Power Filter based on a Rotating Reference Frame[J].Journal of Power Electronics, 2009, 9(5):718-725
[5]许丹,黄利军,杨校辉,等.基于双小波变换的抗干扰电压暂降检测方法研究[J].电气工程学报,2018(4)
[6]肖厦颖,李开成,王凌云,等.一种基于小波包变换的电力系统谐波检测方法[J].电测与仪表,2017,54(24):1-6,16
[7]侯睿.并联有源滤波器控制技术的研究[D].哈尔滨:哈尔滨工业大学,2014
[8]杜芳洲.单相并联型有源电力滤波器的研究与实现[D].广州:广东工业大学,2016
[9]李自成,孙玉坤,刘国海,等.单相电路谐波电流检测的一种参考方法的仿真研究[J].低压电器,2008(17):30-33