Energy balance regulation method and system thereof for hybrid multi-terminal DC system

Abstract

The invention provides an energy balance regulation method and a system thereof for a hybrid multi-terminal DC system. The method comprises steps: voltage balance sites in the system and an initial scheduling instruction of each remaining converter station are set; each constraint parameter of each remaining converter station is calculated; whether each constraint parameter meets a constraint condition is judged; and if not, after the transformer ratio of the converter station is regulated and the port DC of the converter station is corrected, the constraint parameter of each remaining converter station is calculated again or the initial scheduling instruction of the voltage balance site is regulated. Compared with the prior art, the energy balance regulation method and the system thereof for the hybrid multi-terminal DC system provided by the invention can adopt multiple regulation methods to regulate the hybrid multi-terminal DC system to enable the constraint parameter of each remaining converter station to meet the constraint condition, and thus, mutual energy balance among converter stations in the hybrid multi-terminal DC system can be realized.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to an energy balance control method and system for a hybrid multi-terminal direct current system. Background technique [0002] Hybrid DC transmission technology is a DC transmission technology that combines traditional high-voltage direct current transmission technology (LCC-HVDC) with flexible direct current transmission technology (VSC-HVDC), which can give full play to the respective advantages of LCC-HVDC and VSC-HVDC technologies At the same time, it can overcome the existing problems of the two, has great economic and technological advantages, and can play an important role in the future power grid. [0003] The multi-terminal direct current transmission system can solve the problem of multi-source power supply or multi-destination power transmission, and can also connect multiple AC systems or divide the AC system into multiple grids that operate ...

AI Technical Summary

Problems solved by technology

[0005] However, the constraint parameters of the converter station limit the boundary between parameter design and steady-state calculation. The constraint parameters of the LCC converter station mainly include the trigger angle α or the shutdown angle γ. The constraint parameters of the MMC converter station mainly include the voltage modulation ratio M, Therefore, the parameter values ​​and steady-state calculation results calculated by the above method cannot meet the actual needs of the energy balance of the hybrid multi-terminal DC transmission system.

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