Grid Agnostic Droop Control Strategy for Damping Restoration and Optimal Reactive Power-Sharing

IF 5 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Prashant Pant;Vladimir Terzija;Thomas Hamacher;Vedran S. Perić
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引用次数: 0

Abstract

In low-voltage microgrids, parallel grid-forming inverters face the challenge of disproportional reactive power sharing due to (i) the local nature of voltages and (ii) the cross-coupling between the frequency and voltage droop control loops resulting from predominantly resistive feeders. A large magnitude reactive droop coefficient (RDC) can decouple the frequency and voltage droop loops. However, the large droop coefficients can lead to increased power oscillations and insufficiently damped modes in the system. To balance these conflicting objectives, this paper proposes an adaptive droop control strategy that adapts the RDCs in real-time, ensuring the best possible reactive power sharing while maintaining sufficiently high damping of the inverter's oscillatory modes. The damping-ratio is derived by perturbing the RDC and processing the inverter's active power response using the Matrix-Pencil mode estimation algorithm. The proposed control system is validated through Controller Hardware-in-the-Loop (C-HIL) experiments. Typhoon HIL-402 real-time (RT) emulator is used to emulate the power stage. A dedicated Windows PC serves as the secondary controller, updating the reactive droop coefficient. Communication between the hardware emulator and the controller takes place over the OPC UA protocol via a LAN. The results demonstrate that the proposed control offers three key advantages: (i) improved reactive power sharing compared to the fixed droop control method, (ii) enhanced microgrid stability under various disturbances, and (iii) applicability to grids with unknown grid $R/X$ ratios.
阻尼恢复与最优无功共享的电网不可知下垂控制策略
在低压微电网中,由于(i)电压的局部特性和(ii)由主要电阻馈线引起的频率和电压下垂控制回路之间的交叉耦合,并联并网逆变器面临着不成比例无功共享的挑战。大幅度的无功下垂系数(RDC)可以解耦频率和电压下垂环路。然而,较大的下垂系数会导致系统的功率振荡增加和阻尼模式不足。为了平衡这些相互冲突的目标,本文提出了一种自适应下垂控制策略,该策略实时适应rdc,确保最佳的无功共享,同时保持逆变器振荡模式的足够高的阻尼。通过对RDC进行扰动,利用矩阵-铅笔模式估计算法对逆变器有功功率响应进行处理,得到阻尼比。通过控制器硬件在环(C-HIL)实验对该控制系统进行了验证。利用台风hill -402实时仿真器对功率级进行仿真。一台专用的Windows PC作为二级控制器,更新无功下垂系数。硬件仿真器和控制器之间的通信通过局域网通过OPC UA协议进行。结果表明,所提出的控制具有三个关键优势:(i)与固定悬吊控制方法相比,改善了无功功率共享;(ii)增强了微电网在各种干扰下的稳定性;(iii)适用于未知电网R/X比的电网。
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
CiteScore
8.60
自引率
0.00%
发文量
0
审稿时长
8 weeks
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