Method for lowering daily volatility of bus voltage through automatic station coordination control

Abstract

The invention relates to a method for lowering daily volatility of bus voltage through automatic station coordination control in automatic voltage control, and belongs to the technical field of automatic voltage control of power systems. The method comprises the following steps: calculating the voltage fluctuation rate of the day for 220kV buses of all 220kV transformer substations within a provincial power network range, and finding out the buses of which the volatility exceeds an early-warning limit value; for each secondary control sub-region k, selecting a station coordination control bus from the found buses of which the volatility exceeds the early-warning limit value to add to each secondary control sub-region through sensitivity calculation; and for each secondary control sub-region k, determining a power plant control in the sub-region through building a coordinated secondary voltage control model CSVC, so as to achieve a daily volatility limit value control target of the 220kV bus voltage. The method meets the check requirements on the daily volatility of the 220kV bus voltage; and the network voltage stability and the power supply quality are improved.

Description

technical field [0001] The invention belongs to the technical field of automatic voltage control of electric power systems, and in particular relates to a method for reducing the daily fluctuation rate of 220kV bus voltage through automatic plant-station coordinated control in automatic voltage control. Background technique [0002] Automatic voltage control (hereinafter referred to as AVC, AutomaticVoltageControl) system is an important means to achieve power grid security (increase voltage stability margin), economy (reduce network loss), and high-quality (increase voltage qualification rate) operation. The AVC system architecture is based on the grid energy management system (EMS), which can use the real-time operation data of the grid to scientifically make the best reactive power and voltage adjustment scheme from the perspective of overall grid optimization, and automatically send it to power plants, substations, and lower-level grid dispatchers Institutional execution...

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Problems solved by technology

Since the control objects of the automatic voltage control system of the provincial power grid dispatching control center (hereinafter referred to as provincial dispatching control center) mainly include 500kV power plants, 500kV substations and 220kV power plants, the provincial dispatching AVC system has a weak voltage control ability for 220kV substation busbars. On the one hand, The provincial dispatching AVC does not directly control the 220kV substation, and the reactive power equipment on the low-voltage side of the 220kV substation transformer is controlled by the automatic voltage control system of the district-level power grid dispatching control center (hereinafter referred to as the local dispatching). The provincial dispatching AVC has no direct control means for the 220kV substation bus voltage On the other hand, the capacity of the reactive equipment on the low-voltage side of the transformer in the 220kV substation is relatively small, and its ability to influence the voltage of the 220kV power grid is relatively limited. Only relying on the reactive equipment in the 220kV substation cannot effectively control the voltage

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