模拟电压控制电流源在谐波补偿上的应用研究

为了提高供电可靠性和电能质量,设计了一种新型的小功率谐波补偿系统,该系统以模拟电压控制电流源(VCCS)作为主变换电路,通过对DSP输出的谐波信号进行倒相放大变换后重新注入电网,以达到消除电网谐波的目的。首先对整个谐波补偿系统的结构原理做了简要论述,然后对VCCS的直流、交流和温度等特性进行了重点分析,最后应用Multisim和Matlab进行了实验。研究结果表明,该系统可有效克服电力滤波器中电力电子器件非线性工作的缺点,同时其强稳定性及优良的时频响应特性,使其在小功率用电器谐波抑制领域具有良好的应用前景。

Study of VCCS used in harmonics compensation device

In order to improve the power quality, a low-power system for harmonics compensation was proposed. The new equipment used a voltage controlled current source （VCCS） as the primary converter circuit. It made harmonic suppression by amplifying and reversing the harmonics signal acquired by the DSP,then feeding it back to the power grid. The structure and the principle of the system were introduced briefly while the DC,AC and the temperature characteristics of the VCCS were analyzed comprehensively. Simulation result with Matlab and Muhisim demonstrates the advantages of the new system：it efficiently eliminates the nonlinearity inherited in the power electronic device used for power fiher. Also its moderate stability and outstanding time-frequency response characteristic make it have a wide application in harmonic compensation with low-power.