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DC power grid voltage control method

A DC voltage and voltage control technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve the problem that DC voltage and active power cannot be accurately controlled, and achieve the effect of stabilizing DC voltage and power

Inactive Publication Date: 2016-10-26
STATE GRID CORP OF CHINA +4
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Problems solved by technology

In this method, multiple slope voltages control the active power output of the converter station, which is related to the impedance of the DC line and their respective slopes, and the DC voltage and active power cannot be accurately controlled.

Method used

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Embodiment Construction

[0021] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] A method for voltage control of a DC power grid is characterized in that, according to whether the converter station has a voltage regulation capability, the converter stations in the DC power grid are divided into three categories, namely, a voltage control converter station, an auxiliary voltage control converter station, a power Control converter station, voltage control converter station works in constant voltage control mode or current limiting control mode, auxiliary voltage control converter station works in auxiliary voltage control mode or constant DC voltage control mode or power control mode, power control converter station Works in constant power control mode.

[0023] The above-mentioned method for voltage control of a DC power grid is characterized in that the auxiliary voltage controls the conver...

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Abstract

The present invention provides a DC power grid voltage control method. According to whether the converter station has an ability to regulate voltage or not, the converter station is divided into three categories, namely a voltage control converter station, an auxiliary voltage control converter station, and a power control converter station. The voltage control converter station works in a constant voltage control mode or a current limit control mode; the auxiliary voltage control converter station works in an auxiliary voltage control mode, a constant DC voltage control mode or a power control mode; the power control converter station works in a constant power control mode. Through the adoption of the voltage control method disclosed by the invention, the DC voltage and the power can be controlled accurately in a steady state, and the voltage and the power can be stabilized in a transient state.

Description

technical field [0001] The invention belongs to the field of direct current power grids, and particularly relates to a method for voltage control of direct current power grids. Background technique [0002] With the continuous progress of power electronic technology, flexible DC power transmission and distribution technology, as a new generation of DC power transmission and distribution technology, can solve many problems existing in current AC power transmission and distribution technology. . [0003] In the DC power grid, the status of the DC voltage can be analogous to the status of the frequency in the AC power grid. The stability of the DC voltage is directly related to the stability of the DC power flow and the safe and stable operation of the DC power grid. Therefore, the control of the DC voltage in the DC grid is extremely important. In the DC power grid, there are often multiple converter stations with DC voltage control capability. According to the number of con...

Claims

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Application Information

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IPC IPC(8): H02J1/00
CPCH02J1/00
Inventor 宋璇坤樊纪超董云龙卢宇厉璇王柯丁久东李敬如黄平
Owner STATE GRID CORP OF CHINA
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