Method for controlling reactive voltage in ultra-high voltage grid on the basis of improved economic voltage difference

Abstract

The invention provides a method for controlling reactive voltage in an ultra-high voltage grid on the basis of improved economic voltage difference. For current simulation and problems in controlling the reactive voltage in the ultra-high voltage grid, the reactive voltage in the ultra-high voltage grid is balanced in real time by real-time coordination of low voltage side conventional reactive compensation with 500kV grid dynamic reactive compensation. The method allows real-time coordinated control for the low voltage side reactive compensation and 500kV grid side dynamic reactive compensation, and ensures real-time reactive power and efficient and economic operation of the ultra-high voltage grid. In addition, by the use of the method, operating frequency in conventional compensation switching can be reduced greatly, reactive loss of transformers is lowered further, and busbar voltage fluctuation caused by power fluctuation of tie lines is suppressed to a certain degree.

Description

Technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a reactive voltage control method of an UHV power grid based on an improved economic pressure difference. Background technique [0002] On the basis of ensuring the safe and stable operation of the power grid, in order to improve the economic benefits of power grid operation and reduce active power loss and investment, various reactive power optimization algorithms and voltage and reactive power automatic control devices have been greatly developed and played a good role. The reactive power optimization problem is a multi-variable, multi-constrained hybrid nonlinear programming problem. Its control variables include continuous variables such as generator terminal voltage, and discrete variables such as capacitor / reactor switching, transformer tap adjustment, etc. The convergence reliability and calculation speed of its numerical solution are the key to its practical a...

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Problems solved by technology

However, under this method, the voltage control and reactive power control are basically decoupling control, and the main goal is to control the bus voltage within a reasonable range. It fails to fully pay attention to the requirements of reactive power layered balance, and the UHV power grid loss cannot be minimized.

[0005] In the initial stage of UHV power grid construction, the grid structure is relatively simple, and this control strategy is simple and easy to implement, and has good adaptability; with the continuous strengthening of UHV power grid, the number of incoming and outgoing lines of hub substations continues to increase, and the power flow of lines changes frequently, " Designing UHV substation reactive power compensation switching strategies based on changes in transmission power of UHV lines will become increasingly complex and difficult to implement

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