考虑电压畸变的电气弹簧功率因数校正策略研究

为了解决新能源发电系统并网所带来的电力系统稳定问题,提出了新型电力电子装置"电气弹簧"。目前电气弹簧功率因数校正PFC策略是在电网电压为理想正弦波的前提下提出的,不适用于电网电压含有较大谐波分量的实际场合,如整流装置和电弧炉等非线性负荷比重比较大的工厂配电网。为此,在详细分析电气弹簧功率因数校正原理的基础上,提出了一种考虑电网电压畸变的功率因数优化控制策略,通过在电流控制环中加入电流谐波环,将电流畸变率控制在规定范围内,从而在限制电流畸变率的同时,实现电气弹簧的最大功率因数校正功能。最后给出了仿真结果,验证了所提功率因数校正策略的可行性。

Power Factor Correction Strategy of Electric Spring Under Voltage Distortion

In order to make the power grid system operate stably, the new power electronic devices "Electric Spring" has been presented to achieve regulation, harmonic compensation, power factor correction(PFC) and other functions. The PFC study of electric spring regarding the power grid as an ideal sinusoidal voltage, is not suitable for the actual situation of the large harmonic components of the grid voltage, particularly in the large factories where the proportion of non-linear loads is relatively large such as fairing and electric arc furnace. In this article, the principle of the electric spring power factor correction is analyzed detailedly. Considering the grid voltage distorts, the optimal control strategy is proposed to add the current harmonic loop into current control loop and to control the current distortion rate remaining within the specified range, which ensures the current distortion, and while achieves the maximum power factor correction of the electric spring. The simulation result verifies the feasibility of the proposed strategy of PFC.