UHV DC converter station dynamic reactive power optimization method in consideration of the coordination function of phase modifier and system filtering requirement

Abstract

The invention discloses a UHV DC converter station dynamic reactive power optimization method in consideration of the coordination function of a phase modifier and a system filtering requirement. Themethod comprises main steps of: 1) establishing a UHV DC converter station dynamic reactive power optimization model M; and 2) by using a hybrid reactive algorithm of dynamic reactive power optimization, calculating the UHV DC converter station dynamic reactive power optimization model M to optimize the UHV DC converter station. According to a DC transmission power plan and a system dynamic reactive standby requirement, the method enables the remaining capacity of a phase modifier to participate in the steady-state reactive voltage adjustment of the converter station, and takes account that the phase modifier has high upper and lower adjustment margins, thereby realizing the coordinate of the phase modifier and the DC system to fully utilize the performance of the phase modifier.

Description

technical field [0001] The invention relates to the field of converter station optimization, in particular to a dynamic reactive power optimization method for an UHV direct current converter station considering the coordination effect of the regulator and the filtering requirements of the system. Background technique [0002] The DC converter station transmits active power accompanied by a large amount of reactive power consumption. Usually, AC filters and parallel capacitors are installed to meet the needs of its own balance, while the DC system relies on the commutation bus AC voltage commutation to reduce the commutation Large changes in bus voltage are of great significance to prevent commutation failure in DC systems. With the large number of UHV DC transmission systems connected to the grid, the problem of "strong DC and weak AC" in the power grid has become prominent. The State Grid Corporation of China plans to build 47 large-scale condensers to focus on solving the ...

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Problems solved by technology

However, the existing researches focus on the reactive power optimization of AC / DC hybrid system, and take the transmission and distribution network including power plants, AC substations and DC converter stations as the object. The optimization calculation needs the source-load power information of the whole network nodes. In this way, the reactive power of the whole network generator (converter), the coordination and cooperation of the tap of the on-load tap changer and the switch of the capacitive reactor group are realized, but it is not suitable for the local optimization requirements of a single converter station and the condenser; at the same time, The above research does not consider the filtering requirements of the converter station, and the optimization results may not meet the switching requirements of the AC filter

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