一种带有逆变器控制的新型可调电抗器

New-style Adjustable Reactor Based on Inverter Control

针对可调电抗器中普遍存在的电抗值无法连续可调、谐波污染大、响应慢、稳定性差等问题,提出一种基于电压型逆变器及带气隙变压器控制的新型可调电抗器方案——将新型可调电抗器串联连接于电力系统,通过控制变压器二次绕组电压的幅值及相位,实现变压器原边等效阻抗的连续无级可调。以串联型可调电抗器带阻感负载为例,根据劳斯判据进行推导计算,得出系统稳定运行条件。基于电力仿真(power simulation,PSIM)软件对系统进行仿真,在满足稳定运行条件时,该可调电抗器阻抗连续无级可调,没有饱和现象,且不产生任何噪声或谐波。理论分析及仿真结果验证新型可调电抗器及稳定性条件的有效性。

In allusion to problems of discontinuously adjustable reactance value, severe pollution of harmonic, slow respon^^ and poor stability of the adjustable reactor, this paper presents a kind of new-style adjustable reactor scheme based on volt-age typed inverter and air gap transformer control which connects the new-style adjustable reactor with the power system in series and realize continuous and stepless control of transformer original side equivalent impedance by controlling amplitude and phase of secondary winding voltage of the transformer. It takes series adjustable reactor with resistance-inductance load for an example, makes deduction and calculation according to Routh criterion and finally obtains condition for system stable operation. It carries out simulation on the system based on power simulation （PSIM） software and discovers that impedance of this adjustable reactor is continuously stepless adjustable without saturation or any noises and harmonic under the situation of satisfying stable operational conditions. Theoretical analysis and simulation results both verify effectiveness of this new- style adjustable reactor and stability condition.