LVRT Scheme of Permanent Magnet Wind Turbine Based on Dynamic Reactive Power Compensation

In order to promote energy transformation and achieve the dual carbon target, the vigorous development of new energy (NE) power generation, represented by wind power and photovoltaic power generation, is of great importance. The power system is increasingly characterized by "two high and one low" due to the growing installed capacity of wind power and photovoltaic, which tests the anti-interference ability of the power system. In this paper, the permanent magnet wind power system is taken as an example. In view of the lack of quantitative analysis of the reactive current compensation ratio coefficient of the existing fault ride-through (FRT) and the fuzzy control strategy in the transition stage, a low voltage ride-through(LVRT) control scheme based on the whole fault process is proposed. First, the purpose of this paper is the analysis of the changes in the corresponding characteristic quantities during the period of the fault, and clarifies the control objectives of the crossing strategy in each fault stage according to the relevant requirements. In the LVRT stage, a dynamic reactive power priority support strategy is proposed by establishing the quantitative relationship between the reactive power compensation coefficient and the voltage drop at the point of the common coupling(PCC). This FRT scheme can fully utilize the ability of the converter to dynamically compensate for reactive power, and the response is faster than that of the installation of reactive power compensation device. Ultimately, the effectiveness and feasibility of FRT scheme was tested using a simulation model was developed with SimuNPS software.