Coordinated Sequential Control of Individual Generators for Large-Scale DFIG-Based Wind Farms

Abstract

To enhance the Low-voltage Ride Through (LVRT) capability of large-scale centralized wind farms is essential for the safety of the wind farm and the security of the power system. However, the LVRT capability enhancement coordinating the control and protection of individual wind generators merits consideration. To contribute in this way, a Coordinated Sequential Control (CSC) strategy is proposed in this manuscript. Regarding different voltage disturbance scenarios, the goal of voltage control is determined in real-time. To keep as many wind turbines operating gridconnected as possible, a multi-staged coordination strategy is set according to the critical time to ride through the fault. The reactive power control and the shedding of the wind turbines are coordinated in the three stages of the CSC. According to the simulation results, more wind turbines can be kept grid-connected by using the proposed control strategy. Comparison studies are made among several types of coordinating strategies, emphasizing the advantages of the proposed method in terms of both validation and real-time performance.

Fast computation of voltage/VAR feasible boundaries of wind farms: An adaptive parameter aggregation dimensionality reduction equivalence method

“…To further consider the voltage security after different N−1 fault scenarios in an entire convergence area, a hierarchical voltage control strategy was proposed to solve the problems of voltage fluctuation and cascading trip fault of wind turbines in [10,11]. In addition, to improve the computation speed to adapt to more complex and diverse scenarios, [12,13] proposed a coordinated sequential control strategy, which can determine the voltage control target in real time to guarantee voltage security. To copy with the wind power variation, [14,15] proposed a novel coordinated scheduling model under N−1 faults.…”

Improving fault ride‐through capability for doubly‐fed induction generator based on improved system structure and corresponding control scheme

“…A coordinated sequential control (CSC) strategy and an N-IOC scheme are proposed in refs. [19,20] respectively. In ref.…”

A Dynamic Multi-Cell FCL to Improve the Fault Ride through Capability of DFIG-Based Wind Farms

“…To facilitate the integration of an increased number of wind turbines into the power grid, many countries have adopted new grid codes [1]. These latter aim at specifying the electrical performance that generation units must comply with in order to ensure the safe and reliable operation of power grids.…”

“…These latter aim at specifying the electrical performance that generation units must comply with in order to ensure the safe and reliable operation of power grids. Fault ride-through (FRT) capability which aims at mitigating the adverse effects of grid faults is among the aspects covered by grid codes [1,2]. This capability helps to WFs to remain connected to the grid for a certain time, under faulty conditions [2].…”

“…This capability helps to WFs to remain connected to the grid for a certain time, under faulty conditions [2]. This measure prevents the widespread tripping of WTs due to grid disturbances and thwarts local or system wide instabilities [1,2]. Doubly fed induction generators (DFIGs) are widely used in modern WTs because of their variable speed operation, partially rated power converters and ability to decouple the control of the active and reactive powers [3].…”