基于模拟器件的电力系统谐波电流补偿方法

提出了全部采用模拟器件来实现ip-iq算法,能准确检测出谐波电流并对系统补偿谐波的方法。仿真表明该法实时性强、补偿效果好。基于该法的电力系统有源滤波器响应快,高可靠,体积小、成本低。

A Study on A Method of Power System Harmonic Current Detection and Compensation Based on Analog Devices

For the wide applications of the nonlinear loads and all kinds of converter equipments making the power system polluted with a mass of harmonic current. Those harmonics harm devices which may be over-hot, noisy, vibrant and that may be destroyed in the worst instance. It is urgent to eliminate harmonics and improve power quality. Passive filter and Active Power Filter (APF) are the two primary approaches for eliminating harmonics at present. For the inherent shortcomings of LC filters, it is being an important way to eliminate harmonics dynamically by APF. A method for harmonic current detection and compensation is proposed on the basis of analog devices .It's based on the theory of i_ p -i_ q calculating modes . The harmonic current can be detected and compensated accurately. The advantages of i_ p -i_ q calculating modes are that its results are not influenced by distorted voltages and it can be easy to separate fundamental signals and harmonic signals by low pass filter as the fundamental signals's frequency is transformed to 0 Hz. In order to prove the designing's effect, an APF model based on instantaneous reactive theory is built in Matlab/Simulink which is a simulated tool for power system and some experimentations are simulated. It is shown that the dynamic response is fast and the harmonic current compensation is effective by simulation results. And it is also proved the correctness and feasibility to study and design APF with analog devices. When the power system APF is designed with this method, it has a lot of advantages such as High security, quickly response, small volume and low cost etc. In China, the studies and exploitations in APF is at its beginning stage, and its products have not been used widely. So the studies in APF have important significance.