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Control method of ultra-high direct-current transmission voltage

A technology of UHV DC and transmission voltage, which is applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., and can solve problems such as DC current low-frequency oscillation, voltage imbalance, and measurement circuit error

Active Publication Date: 2010-06-02
XJ ELECTRIC +1
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Problems solved by technology

[0004] In addition, for the rectifier side, since the two valve group control systems adopt DC current control, the controlled quantity is the same DC current, and the measurement loops of the two valve group control systems will inevitably have errors, so in one system, two Voltage imbalance between valve groups and low-frequency oscillation of DC current

Method used

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  • Control method of ultra-high direct-current transmission voltage
  • Control method of ultra-high direct-current transmission voltage
  • Control method of ultra-high direct-current transmission voltage

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Embodiment Construction

[0012] figure 1 The measurement signals UdH_R, UdH_I, Id_I used for constant voltage control on the inverter side are given in ; the measurement positions of the measurement signals UdH_R, UdM_R, UdN_R, Id_R used for voltage balance control.

[0013] Such as figure 1 , 2 , 3, firstly, in the pole control system on the inverter side, the voltage drop of the DC line and the grounding pole line is calculated through the DC current and DC voltage of the pole, the DC current of the opposite pole and the DC voltage of the opposite station. The DC voltage reference value does not need to be set to the voltage level of the entire pole on the rectification side, but to the voltage level of a single valve group on the rectification side. Subtract half of the voltage drop between the DC line and the ground electrode line from the DC voltage reference value to obtain the controller voltage reference value of each valve group. In the DC voltage control logic of each valve group, it is no...

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Abstract

The invention relates to a control method of an ultra-high direct-current transmission voltage, which is characterized by comprising the following steps: (1) in a pole control system on the inversion side, calculating the voltage drop between a direct-current line and an earthing pole line according to the direct current and direct-current voltage of the local pole, the direct current of the opposite pole and the direct-current voltage of the opposite station, and setting the reference value of the direct-current voltage as the voltage level of the single valve bank on the rectifying side; (2) and subtracting half of the voltage drop between the direct-current line and the earthing pole line from the reference value of the direct-current voltage to obtain the control device voltage reference value of each valve bank, controlling the direct-current voltage on the two ends of the local valve bank to the obtained voltage reference value, and determining the operating voltage level on the rectifying side by using the direct-current voltages of the two valve banks. The invention solves the technical problems in rectifying-side fixed current control and inversion-side fixed voltage control in the ultra-high direct-current transmission engineering.

Description

technical field [0001] The invention relates to a method for realizing a control function in an ultra-high voltage direct current transmission project, in particular to a method for realizing a direct current voltage control. Background technique [0002] At present, in common DC transmission projects, the rectifier side generally adopts constant current operation mode, and the inverter side can choose constant voltage control or constant arc extinguishing angle control. The implementation method of constant voltage control on the inverter side is that the inverter side first calculates the DC voltage at both ends of its own valve group and the ground electrode voltage, and then calculates the voltage drop of the DC line, thereby calculating the DC voltage at the rectifier side. The controller controls the DC voltage at the rectification side to a level set by the reference value according to the DC voltage reference value. [0003] Since each pole of the UHV DC transmissio...

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Application Information

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IPC IPC(8): H02M1/08H02M7/00
Inventor 黎小林王海军刘涛马仪成
Owner XJ ELECTRIC
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