Abstract
The ESS is considered as an effective tool for enhancing the flexibility and controllability of a wind farm, and the optimal control scheme of a wind farm with distributed ESSs is vital to the stable operation of wind power generation. In this paper, a coordinated active and reactive power control strategy based on model predictive control (MPC) is proposed for doubly fed induction generator (DFIG)-based wind farm (WF) with distributed energy storage systems (ESSs). The proposed control scheme coordinates the active and reactive power output among DFIG wind turbines (WTs), grid-side converters (GSCs), and distributed ESSs inside the WF, and the aim is to decrease fatigue loads of WTs, make the WT terminal voltage inside the extent practicable, and take the WF economic operation into consideration. Moreover, the best reactive power references of DFIG stator and GSC are produced independently based on their dynamics. At last, the control scheme generates optimal power references for all ESS to make the SOC of each ESS converge to their average state. With the distributed ESSs, the WF controller regulates the WTs inside WF more flexibly. A WF composed of 10 DFIG WTs was utilized to verify the control performance of the proposed coordinated active and reactive power control strategy.
Highlights
Several feeders are connected to the MV collection point, and each feeder is connected to series wind turbines (WTs)
The DC bus voltage is adjusted by gridside converters (GSCs), which offering reactive power support for wind farm (WF) AC grid at the same time
In order to decouple active and reactive power optimal control and keep fatigue loads at a minimum, the control strategy is divided into two steps. every doubly fed induction generator (DFIG) active power reference and a total energy storage systems (ESSs) active power reference are produced by the controller in the first stage, which aims to follow the dispatch command and reduce the fatigue loads by minimizing variations in TS and Ft of WTs
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. An MPC-based active and reactive power integrated control strategy for DFIG WF with distributed ESSs is proposed in this paper, which has two stages. The controller offer optimized reactive power references of DFIG stator and grid-side converter to adjust the voltage of each bus in the reasonable range, and reduce the WF network losses. The most important contribution of this paper is the MPC based coordinated active and reactive power control strategy for distributed large-scale WFs with ESSs. The ideal reactive power references of DFIG stator and GSC are generated separately to keep bus voltage deviation and network power losses at a minimum. Energies 2021, 14, x FOR PEER REVIEW the WF network losses. tracking the dispatch command and maintain of 19 ing the state-of-charge (SOC) of ESSs within a specified range
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