Abstract

This paper proposes an optimal voltage regulation scheme (OVRS) for distribution systems with rich photovoltaic (PV). Various regulation devices are optimally controlled in a coordinated manner: PV inverter, D-STATCOM, step voltage regulator (SVR), and on-load-tap-changer (OLTC). A data structure algorithm is proposed to split the distribution system into layered zones considering the radial structure of the system. The solution process of the proposed scheme is accomplished by a meta-heuristic optimizer. OVRS addresses the voltage violations while yielding a coordinated operation of the various control devices. The proposed OVRS involves three control levels to completely prevent voltage violations. In the first control level, the PV inverter and D-STATCOM mitigate rapidly the local voltage deviation through injecting/absorbing optimized reactive power. The second control level is a decentralized-based control scheme that utilizes the voltage control devices in each zone to handle the voltage violations if any. For each zone, the control devices in the upper-stream zones (parent zones) are managed by the third control level to ensure cooperative control actions. The simulation results on the 119-bus distribution system, with clear, low fluctuation, and high fluctuation of solar radiation profiles, demonstrate the effectiveness of the proposed OVRS.

摘要

本文提出了一种用于富光伏 (PV) 配电系统的最佳电压调节方案 (OVRS)。各种调节设备以协调的方式进行优化控制：光伏逆变器、D-STATCOM、步进电压调节器 (SVR) 和有载分接开关 (OLTC)。考虑到系统的径向结构，提出了一种数据结构算法，将配电系统划分为分层区域。所提出方案的求解过程由元启发式优化器完成。OVRS 解决电压违规问题，同时产生各种控制设备的协调操作。提议的 OVRS 涉及三个控制级别，以完全防止电压违规。在第一个控制级别，PV 逆变器和 D-STATCOM 通过注入/吸收优化的无功功率，快速缓解局部电压偏差。第二个控制级别是基于分散的控制方案，它利用每个区域中的电压控制设备来处理电压违规（如果有）。对于每个区域，上游区域（父区域）中的控制设备由第三控制级别管理，以确保协同控制动作。119 总线配电系统的仿真结果表明，太阳辐射剖面清晰、波动小、波动大，证明了所提出的 OVRS 的有效性。上游区域（父区域）的控制设备由第三级控制层管理，保证协同控制动作。119 总线配电系统的仿真结果表明，太阳辐射剖面清晰、波动小、波动大，证明了所提出的 OVRS 的有效性。上游区域（父区域）的控制设备由第三级控制层管理，保证协同控制动作。119 总线配电系统的仿真结果表明，太阳辐射剖面清晰、波动小、波动大，证明了所提出的 OVRS 的有效性。