CAJ | 학술논문

由于非线性负载在电力系统中的广泛应用，电网中无功与谐波污染越来越严重，对电网的稳定运行产生了不利的影响，因此，能够快速、准确地检测出无功与谐波电流并给予适当的补偿显得尤为重要。首先，引入一种基于瞬时无功功率理论的改进检测技术来替代传统的无功电流检测法，该方法去除了锁相环，简化了硬件电路的设计；其次采用电流平均值的滤波方法来克服低通滤波器类型、阶数以及截止频率对响应速度的影响；最后利用Matlab/Simulink软件搭建了检测电路的模型，通过对三相电源电压无畸变以及有畸变情况下的仿真来验证改进检测的有效性。仿真结果表明所提出的方法不仅具有检测精度高的优点，而且具有良好的动态响应。
유우비선성부재재전력계통중적엄범응용，전망중무공여해파오염월래월엄중，대전망적은정운행산생료불리적영향，인차，능구쾌속、준학지검측출무공여해파전류병급여괄당적보상현득우위중요。수선，인입일충기우순시무공공솔이론적개진검측기술래체대전통적무공전류검측법，해방법거제료쇄상배，간화료경건전로적설계；기차채용전류평균치적려파방법래극복저통려파기류형、계수이급절지빈솔대향응속도적영향；최후이용Matlab/Simulink연건탑건료검측전로적모형，통과대삼상전원전압무기변이급유기변정황하적방진래험증개진검측적유효성。방진결과표명소제출적방법불부구유검측정도고적우점，이차구유량호적동태향응。
Due to the wide application of nonlinear loads in power system, reactive and harmonic pollution in the grid is getting serious, which influences the stability of power grid operation. Therefore, it is important to detect the reactive and harmonic currents and compensate for them appropriately. First, an improved detection method based on the instantaneous reactive power theory is introduced to replace traditional reactive current detection method, which eliminates phase-locked loop and simplifies the design of hardware circuit. Then the filtering using current average is adopted to overcome the impact of the type, order and cut-off frequency of the low-pass filter on response speed. Finally, Matlab/Simulink software is used to build the model of the detection circuit, and three-phase supply voltages with and without distortion are simulated respectively to verify the validity of the improved detection method. The results show that the proposed method has high accuracy and good dynamic response.