An Improved Collaborative Control Scheme to Resist Grid Voltage Unbalance for BDFG-Based Wind Turbine

IF 2.6 3区 工程技术 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS
Defu Cai, Rusi Chen, Sheng Hu, Guanqun Sun, Erxi Wang, Jinrui Tang
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引用次数: 0

Abstract

This article presents an improved collaborative control to resist grid voltage unbalance for brushless doubly fed generator (BDFG)-based wind turbine (BDFGWT). The mathematical model of grid-connected BDFG including machine side converter (MSC) and grid side converter (GSC) in the αβ reference frame during unbalanced grid voltage condition is established. On this base, the improved collaborative control between MSC and GSC is presented. Under the control, the control objective of the whole BDFGWT system, including canceling the pulsations of electromagnetic torque and the unbalance of BDFGWT’s total currents, pulsations of BDFGWT’s total powers are capable of being realized; therefore, the control capability of BDFGWT to resist unbalanced grid voltage is greatly improved. Moreover, improved single-loop current controllers adopting PR regulators are proposed for both MSC and GSC where the sequence extractions for both MSC and GSC currents are not needed any more, and hence the proposed control is much simpler. In addition, the transient characteristics are also improved. Moreover, in order to achieve the decoupling control of current and average power, current controller also adopts the feedforward control approach. Case studies for a two MW BDFGWT system are implemented, and the results verify that the presented control is capable of effectively improving the control capability for BDFGWT to resist grid voltage unbalance and exhibit good stable and dynamic control performances.
基于 BDFG 的风力涡轮机抵抗电网电压不平衡的改进型协同控制方案
本文针对基于无刷双馈发电机(BDFG)的风力涡轮机(BDFGWT),提出了一种抵抗电网电压不平衡的改进型协同控制方法。本文建立了并网 BDFG 的数学模型,其中包括在电网电压不平衡条件下的αβ 参考框架下的机侧变流器(MSC)和电网侧变流器(GSC)。在此基础上,提出了改进的 MSC 和 GSC 协同控制。在该控制下,整个 BDFGWT 系统的控制目标,包括消除电磁转矩脉动、BDFGWT 总电流不平衡、BDFGWT 总功率脉动均得以实现,从而大大提高了 BDFGWT 抗电网电压不平衡的控制能力。此外,还针对 MSC 和 GSC 提出了采用 PR 调节器的改进型单回路电流控制器,其中不再需要 MSC 和 GSC 电流的序列提取,因此所提出的控制更加简单。此外,瞬态特性也得到了改善。此外,为了实现电流和平均功率的解耦控制,电流控制器还采用了前馈控制方法。我们对一个两兆瓦 BDFGWT 系统进行了案例研究,结果验证了所提出的控制能够有效提高 BDFGWT 抗电网电压不平衡的控制能力,并表现出良好的稳定和动态控制性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Electronics
Electronics Computer Science-Computer Networks and Communications
CiteScore
1.10
自引率
10.30%
发文量
3515
审稿时长
16.71 days
期刊介绍: Electronics (ISSN 2079-9292; CODEN: ELECGJ) is an international, open access journal on the science of electronics and its applications published quarterly online by MDPI.
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