谐波污染问题是配电系统中的一个备受关注的重要问题,目前已经有一些方法用来计算各个谐波源在电网公共耦合点(point of common coupling,PCC点)的谐波干扰。临界阻抗法(cirtical impedance method,CIM)是用于配电网谐波源探测的一种新...谐波污染问题是配电系统中的一个备受关注的重要问题,目前已经有一些方法用来计算各个谐波源在电网公共耦合点(point of common coupling,PCC点)的谐波干扰。临界阻抗法(cirtical impedance method,CIM)是用于配电网谐波源探测的一种新方法,该方法通过比较戴维南回路中两个谐波电压源的大小,取较大的一个定为主谐波源。临界阻抗法的具体实现是通过对于PCC点测量得到该点的各次谐波电压和电流值,结合利用开关操作等方法得到的系统谐波阻抗值,求出系统的临界阻抗值,通过临界阻抗值和系统阻抗值的比较来判定主谐波源。通过对于系统各种阻抗的分析,此方法可以有效地测量出单端电源网络中的谐波源。考虑到在两端网络中,PCC点两侧阻抗角度不同引起的误差,本文提出了相交法,进行系统临界阻抗的修正(该方法对于单端系统也可以作出正确的判断)。对于系统阻抗角度已知的情况下,该方法可以正确地判断谐波源方向:对于阻抗信息不知道的情况,该方法可以给出谐波源方向的概率。展开更多
In this paper, a multiplexing technique is applied on a neural harmonics extraction method, based on an efficient formulation of the instantaneous reactive power theory. This approach can be used in nonlinear loads co...In this paper, a multiplexing technique is applied on a neural harmonics extraction method, based on an efficient formulation of the instantaneous reactive power theory. This approach can be used in nonlinear loads compensation with APFs （Active Power Filters）. The architecture for reference current generation, synchronized by a neural phase lock-loop, is composed of three Adaline neural networks. This leads to an important consumption of field programmable gate array resources during implementation. The proposed technique uses only one Adaline and keeps the immunity of the approach under non-sinusoidal and unbalanced conditions of voltage. Simulation results of the neural harmonics detection system connected to a reference current controller show balanced and sinusoidal source currents under various conditions. Results with experimental measurement made on an APF test bench demonstrate its good performances on harmonics filtering. Moreover, the simplified structure from the new approach called mp-q method shows a significant resource reduction.展开更多
文摘谐波污染问题是配电系统中的一个备受关注的重要问题,目前已经有一些方法用来计算各个谐波源在电网公共耦合点(point of common coupling,PCC点)的谐波干扰。临界阻抗法(cirtical impedance method,CIM)是用于配电网谐波源探测的一种新方法,该方法通过比较戴维南回路中两个谐波电压源的大小,取较大的一个定为主谐波源。临界阻抗法的具体实现是通过对于PCC点测量得到该点的各次谐波电压和电流值,结合利用开关操作等方法得到的系统谐波阻抗值,求出系统的临界阻抗值,通过临界阻抗值和系统阻抗值的比较来判定主谐波源。通过对于系统各种阻抗的分析,此方法可以有效地测量出单端电源网络中的谐波源。考虑到在两端网络中,PCC点两侧阻抗角度不同引起的误差,本文提出了相交法,进行系统临界阻抗的修正(该方法对于单端系统也可以作出正确的判断)。对于系统阻抗角度已知的情况下,该方法可以正确地判断谐波源方向:对于阻抗信息不知道的情况,该方法可以给出谐波源方向的概率。
文摘In this paper, a multiplexing technique is applied on a neural harmonics extraction method, based on an efficient formulation of the instantaneous reactive power theory. This approach can be used in nonlinear loads compensation with APFs （Active Power Filters）. The architecture for reference current generation, synchronized by a neural phase lock-loop, is composed of three Adaline neural networks. This leads to an important consumption of field programmable gate array resources during implementation. The proposed technique uses only one Adaline and keeps the immunity of the approach under non-sinusoidal and unbalanced conditions of voltage. Simulation results of the neural harmonics detection system connected to a reference current controller show balanced and sinusoidal source currents under various conditions. Results with experimental measurement made on an APF test bench demonstrate its good performances on harmonics filtering. Moreover, the simplified structure from the new approach called mp-q method shows a significant resource reduction.
