Multi-point voltage control method for direct-current power grids

Abstract

The invention provides a multi-point voltage control method for direct-current power grids. The multi-point voltage control method includes that system power and conversion station power are controlled, and for control of the system power, sum of active power output by voltage regulation conversion stations is calculated according to size of the direct-current power grids; for the control of the conversion station power, output of the active power is calculated according to the size of active capacity of the conversion stations. The conversion stations involving in system voltage regulation are equivalent to a whole, capacity of multiple conversion stations is utilized, and voltage regulation capacity of the direct-current power grids is improved; under the premise that the sum of the active power is assuredly constant, output of the active power of all the conversion stations involving in voltage regulation can be regulated according to the size of the capacity of the conversion stations, power utilization in regulating the conversion stations can be equivalent, and safety and stability in operation of the direct-current power grids are improved.

Description

technical field [0001] The invention relates to a multi-point voltage control method, in particular to a multi-point voltage control method based on energy balance of a converter station. Background technique [0002] The DC power grid is an energy transmission system composed of a large number of DC terminals interconnected in the form of DC. The technical report of the International Large Grid Conference (CIGRE) working group defines the DC power grid as: The DC power grid is composed of multiple mesh and radial connections. DC network composed of converters. In terms of large-scale distributed renewable energy access, ocean island power supply, offshore wind farm cluster transmission, and new urban power grid construction, the DC grid technology based on flexible DC transmission is considered to be the most effective technical solution and has become an international Research hotspots in the field of electric power. The DC voltage in the DC grid can not only reflect the...

AI Technical Summary

Problems solved by technology

If the above m voltage control variables are independent of each other, the power distribution of the DC grid cannot be determined. If the above m voltage control variables are related to each other, that is, the m voltage control variables can be related to each other through the power of the converter station, then the m voltage control variables The connection between the variable and the DC grid voltage is weak. At this time, the capacity of each converter station is not fully utilized, and the regulation ability of the DC grid voltage is also poor.

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