A general analytical approach to reach maximum grid support by PMSG-based wind turbines under various grid faults

Abstract

A novel fault ride-through strategy for wind turbines, based on permanent magnet synchronous generator, has been proposed. The proposed strategy analytically formulates the reference current signals, disregarding grid fault type and utilizes the whole system capacity to inject the reactive current required by grid codes and deliver maximum possible active power to support grid frequency and avoid generation loss. All this has been reached by taking the grid-side converter’s phase current limit into account. The strategy is compatible with different countries’ grid codes and prevents pulsating active power injection, in an unbalanced grid condition. Model predictive current controller is applied to handling rapid transients. During faults, the energy storage system maintains DC-link voltage, which causes voltage fluctuations to be eliminated, significantly. A fault ride-through strategy was proposed for PMSG-based wind turbines, neglecting fault characteristics, second, reaching maximum possible grid support in faulty grid conditions, while avoiding over-current and third, considerable reduction in energy storage system size and power rating. Inspiring simulations have been carried out through MATLAB/SIMULINK to validate the feasibility and competency of the proposed fault ride-through method and efficiency of the entire control system.

摘要

提出了一种基于永磁同步发电机的风力发电机故障共线策略。该策略不考虑电网故障类型,对 参考电流信号进行了解析计算,并利用整个系统的容量来注入电网编码所需的无功电流,传输最大可 能的有功功率以支持电网频率,避免发电损耗。所有这些都是通过考虑电网侧变换器的相电流限制而 实现的。该策略适用于不同国家的电网编码,在电网不平衡的情况下,防止了脉动有功功率的注入。 模型预测电流控制器用于处理快速瞬变。在故障期间,储能系统保持DC 连接电压,显著消除电压波 动。本文提出了一种基于永磁同步电机的风电机组故障共乘策略,忽略了故障特性;其次,在电网故 障的情况下达到最大可能的电网支持,同时避免过电流;第三,大幅度降低储能系统的规模和额定功 率。通过MATLAB/SIMULINK 仿真,验证了该方法的可行性和竞争力,并对整个控制系统的效率进 行了仿真。