Evaluation Method for Voltage Regulation Range of Medium-Voltage Substations Based on OLTC Pre-Dispatch

Xuekai Hu (), Shaobo Yang, Lei Wang, Zhengji Meng, Fengming Shi and Siyang Liao
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Xuekai Hu: Research Institute of Electric Power Science, State Grid Hebei Electric Power Co., Shijiazhuang 050021, China
Shaobo Yang: Research Institute of Electric Power Science, State Grid Hebei Electric Power Co., Shijiazhuang 050021, China
Lei Wang: Research Institute of Electric Power Science, State Grid Hebei Electric Power Co., Shijiazhuang 050021, China
Zhengji Meng: Research Institute of Electric Power Science, State Grid Hebei Electric Power Co., Shijiazhuang 050021, China
Fengming Shi: School of Electrical, Automation Wuhan University, Wuhan 430072, China
Siyang Liao: School of Electrical, Automation Wuhan University, Wuhan 430072, China

Energies, 2024, vol. 17, issue 17, 1-21

Abstract: A new energy industry represented by photovoltaic and wind power has been developing rapidly in recent years, and its randomness and volatility will impact the stable operation of the power system. At present, it is proposed to enrich the regulation of the power grid by tapping the regulation potential of load-side resources. This paper evaluates the overall voltage regulation capability of substations under the premise of considering the impact on network voltage security and providing a theoretical basis for the participation of load-side resources of distribution networks in the regulation of the power grid. This paper proposes a Zbus linear power flow model based on Fixed-Point Power Iteration (FFPI) to enhance power flow analysis efficiency and resolve voltage sensitivity expression. Establishing the linear relationship between the voltages of PQ nodes, the voltage of the reference node, and the load power, this paper clarifies the impact of reactive power compensation devices and OLTC (on-load tap changer) tap changes on the voltages of various nodes along the feeder. It provides theoretical support for evaluating the voltage regulation range for substations. The day-ahead focus is on minimizing network losses by pre-optimizing OLTC tap positions, calculating the substation voltage regulation boundaries within the day, and simultaneously optimizing the total reactive power compensation across the entire network. By analyzing the calculated examples, it was found that a pre-scheduled OLTC (on-load tap changer) can effectively reduce network losses in the distribution grid. Compared with traditional methods, the voltage regulation range assessment method proposed in this paper can optimize the adjustment of reactive power compensation devices while ensuring the voltage safety of all nodes in the network.

Keywords: Zbus linearized power flow model; voltage sensitivity; day-ahead pre-dispatch; total reactive power regulation; substation voltage regulation range (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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