变电所非对称电压畸变的自适应数据融合研究

Research on Adaptive Data Fusion of Asymmetrical Voltage Distortion in Substation

由于电力机车负载具有非线性的特点,造成牵引变电所电压畸变率高、谐波高。牵引负荷从电网吸收基波电流的同时,也不断向电网注入大量的谐波电流,产生电压畸变威胁供电安全。本文通过建立牵引变电所三相模型,采集不同实验数据,结合Matlab仿真研究V/v型接线牵引变压器在电力系统中引起的电压畸变率,利用自适应控制融合算法修正参数的规律,合理控制原始参数模型和状态。仿真结果表明自适应控制能避免局部电网电压畸变率高、电压闪变和谐波电流超标,在提高电能质量和电网安全性方面效果明显。

Because the electric locomotive load has the nonlinear characteristic, the voltage distortion rate of traction substation is high and the harmonic is high. Traction load absorbs the fundamental current from the grid, also injectes a lot of harmonic current to the grid, generates voltage distortion who threat power supply security. By establishing three-phase model of traction substation, collecting different experimental data, the voltage distortion rate caused by V/v type traction transformer in power system is studied on basis of Matlab simulation, and the parameters are modified by adaptive control fusion algorithm, reasonable control of original parameter model and state. The results show that adaptive control can avoid the high distortion rate of local power grid, voltage flicker and harmonic current exceeding. The improving power quality and grid security effect is obvious.