Coordinating voltage control method of provincial power network and regional power network based on two-way coordination constraint

Abstract

The invention relates to a coordinating voltage control method of a provincial power network and regional power networks based on two-way coordination constraint, belonging to the technique field of the automatic voltage control of an electric system. The method comprises the following steps: selecting the high-voltage side reactive power of a transformer of a transformer substation positioned on the boundary position of the provincial power network and each regional power network as the coordination variable of the provincial power network for the regional power networks; selecting a high-voltage side busbar voltage amplitude value of each transformer substation positioned on the boundary position of the current periodic provincial power network and the regional power networks as the coordination variable of the regional power networks for the provincial power network; establishing and solving an optimal power flow model of the provincial power network on a provincial power network side so as to obtain the state quantity of each node inside the provincial power network as well as the upper limit and the lower limit of the coordination constraint of the high-voltage side reactive power of the transformer of the transformer substation positioned on the boundary position; and substituting a coordination constraint condition of one control period of the regional power networks with a related constraint condition of the high-voltage side reactive power of the transformer of the transformer substation positioned on the original boundary position by each regional power network control center, and controlling the reactive power voltage of the region. The coordinating voltage control method can effectively reduce the network loss and enhance the voltage safety level of the power networks.

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 coordinated voltage control method for provincial and regional power grids based on bidirectional coordination constraints. Background technique [0002] Automatic Voltage Control (hereinafter referred to as AVC, Automatic Voltage Control) system is an important means to achieve power grid security (increase voltage stability margin), economy (reduce network loss), and high-quality (increase voltage pass rate) operation. Control the reactive power output of generators, transformer taps and reactive power compensation equipment to achieve a reasonable distribution of reactive power and voltage in the grid. [0003] The master station part of the AVC system is implemented based on software in the power system control center, which requires that it must be consistent with the dispatch management system of the power system its...

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Problems solved by technology

This method essentially takes the interests of the provincial power grid as the starting point, and reflects the support of the regional power grid to the provincial power grid, but it does not reflect and cannot realize the supporting role of the provincial power grid to the regional power grid

In fact, due to the tight coupling between power grids, the impact of the provincial power grid on the regional power grid is very significant. The automatic voltage control of the provincial power grid mainly affects the voltage of the 220kV busbar, and the 220kV busbar, as the root node of the regional power grid, will directly affect the regional radiation For the overall voltage level of the power grid, if the provincial power grid adjusts the 220kV voltage to an unreasonable direction, it may cause large-scale actions of control equipment in dozens of low-voltage substations radiating the power grid in the entire region. However, under the existing control mode, a On the one hand, the regional power grid can only passively receive the control targets issued by the provincial power grid, and cannot give feedback on the unreasonable control behavior of the provincial power grid; Whether its own control behavior has a negative impact on the regional power grid, which eventually leads to unreasonable reactive power flow and control actions between the upper and lower power grids

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