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State coordinated voltage control in an active distribution network with on-load tap changers and photovoltaic systems

2021-07-08

文章导读

国际能源署等权威研究机构的研究成果表明，太阳能发电量将在未来10年引领可再生能源供应的激增，由于价格下降使太阳能比新的火电和天然气发电厂更便宜，太阳能有望成为“新电力之王”。随着光伏成本降低和政策优惠，太阳能光伏发电在配电网络中的渗透率也逐渐增加。随着光伏系统的渗透率的增加，利用光伏逆变器的无功功率来减少电压偏差正的相关技术在得到应用。近年来，基于逆变器的分布式能源下垂控制已成为这项研究中的一个重要方法。光伏系统参与电压调节及其与现有控制器(如有载分接开关)的协调，对于将电压控制在规定限值内至关重要。本论文提出的控制策略以分布式方式与现有的控制相协调。配电系统仿真结果验证了该方法的有效性。

State coordinated voltage control in an active distribution network with on-load tap changers and photovoltaic systems

含有载调压开关和光伏系统的主动配电网电压协调控制技术研究

Praveen Prakash Singh, Ivo Palu

（Department of Electrical Power Engineering and Mechatronics, Tallinn University of Technology）

Abstract

Decreasing costs and favorable policies have resulted in increased penetration of solar photovoltaic (PV) power generation in distribution networks. As the PV systems penetration is likely to increase in the future, utilizing the reactive power capability of PV inverters to mitigate voltage deviations is being promoted. In recent years, droop control of inverter- based distributed energy resources has emerged as an essential tool for use in this study. The participation of PV systems in voltage regulation and its coordination with existing controllers, such as on-load tap changers, is paramount for controlling the voltage within specified limits. In this work, control strategies are presented that can be coordinated with the existing controls in a distributed manner. The effectiveness of the proposed method was demonstrated through simulation results on a distribution system.

Keywords

Photovoltaic (PV) system, On-load tap changer (OLTC), Voltage regulation, Coordinated control, Droop control.

Fig.1 Single-line diagram of a feeder connected with a PV and a load

Fig.2 Schematic representation of an OLTC with an equivalent circuit

Fig.3 Classification of distributed PV control strategies

Fig.4Q-V droop characteristic of the PV system [28]

Fig.5 Flowchart for coordination of OLTCs and Q-V droop

Fig.6 20 kV CIGRE MV benchmark network and different zones in the feeder based on sensitivity

Fig.7 Voltage variation at different buses

Fig.8 Power output of a PV system (in kW)

Fig.9 Daily load profile for feeder-1 loads

Fig.10 Voltage magnitude at Bus-11 in all scenarios

Fig.11 Variation of the tap position

Fig.12 Voltage magnitude at Bus-1 for all scenarios

Fig.13 Voltage magnitude (in p.u.) at Bus-11 with and without Q-V control (x-axis in time sequence)

Fig.14 Reactive power consumption of the PV system

Fig.15 Voltage magnitude at Bus-11 for each case

Fig.16 Tap position of the OLTC

Fig.17 Voltage magnitude at Bus-1 for all case scenarios

Fig.18 Voltage magnitude at Bus-1 and Bus-11

Fig.19 OLTC tap position

Fig.20 Reactive power output of PV systems with Q-V control

本文引文信息

Singh P, Palu I J (2021) State coordinated voltage control in an active distribution network with on-load tap changers and photovoltaic systems. Global Energy Interconnection, 4(2): 117-125

普拉文·普拉卡什·辛格，伊沃·帕卢 (2021) 含有载调压开关和光伏系统的主动配电网电压协调控制技术研究. 全球能源互联网（英文），4(2): 117-125

Biographies

Praveen Prakash Singh

Praveen Prakash Singh obtained his BTech in electrical degree from GLA University Mathura (India) and MTech degrees from Aalborg University, Denmark. He was a Research Associate in the department of Electrical Engineering, IIT Kanpur, India. Presently he is working for PhD degree in energy systems, Tallinn University of Technology (TalTech), Estonia. His research interest includes power systems, smart grid, electric vehicles, electricity market and renewable energy sources.

Ivo Palu

Ivo Palu received the Ph.D. degree in electrical power engineering from Tallinn University of Technology (TalTech), Estonia, in 2009. He has taught various courses, including wind energy and electrical materials. He is currently a Professor and the Head of the Department of Electrical Power Engineering and Mechatronics, TalTech. His main research interests include wind turbine co-operation with thermal power plants and grid integration of new energy sources. He is a member of the Board of Estonian Society for Electrical Power Engineering and the Supervisory Board of Estonian Power Company Eesti Energia AS.

编辑：王闻昊王彦博

审核：王伟

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