Voltage control method based on direct current power modulation
A voltage control method and DC power modulation technology, applied in the direction of reducing/preventing power oscillation, which can solve the problems of inability to achieve continuous control, high system voltage, and sudden voltage changes.
Inactive Publication Date: 2014-05-21
STATE GRID CHONGQING ELECTRIC POWER +1
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On the other hand, the DC blocking fault connected to the grid in the power transmission channel can lead to high voltage in the system. Using conventional control methods such as switching on and off capacitor reactors can easily lead to sudden changes in voltage and cannot achieve continuous control
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[0028] Implementation steps of a voltage control method based on DC power modulation:
[0029] 1) Determine the voltage control node and the DC participating in the voltage control. Suppose it contains M participating DCs and mark the i-th DC number as i; suppose there are K control nodes in total, and mark the j-th control node number as j.
[0030] 2) Determine the voltage control area curve through power grid security and stability analysis. Set voltage rise , Voltage drop fixed value ,more than the Or less than The area is the control area.
[0031] 3) Set the target value of voltage control, including the control target value to solve the problem of voltage increase And voltage sag problem control target value .
[0032] 4) Through the measurement and control device installed in the control node, the trajectory of the voltage of the control node changing with time is monitored in real time, and the voltage of the jth node is recorded as .
[0033] 5) Compare the voltage tra...
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The invention belongs to the technical field of an electric system and electric system automation, and provides a voltage control method based on direct current power modulation. The method comprises the main steps of: (1) confirming to-be-controlled nodes and direct current involved in the voltage control; (2) confirming a voltage control zone curve of the controlled nodes; (3) setting a voltage control target value; (4) actually measuring the voltage of the controlled nodes; (4) comparing a voltage track of the nodes with the voltage control zone curve; and trigging the voltage control in case of meeting the conditions; (5) calculating the voltage offset value of the controlled nodes; (6) calculating the sensitivity of the direct current power changes in response to the voltage changes of the controlled nodes to form a sensitivity matrix; and (7) calculating and optimizing a control strategy based on a target of minimum direct current power adjustment amount.
Description
technical field [0001] The invention belongs to the technical field of electric power system and automation thereof. More precisely, the invention relates to a voltage control method based on DC power modulation. Background technique [0002] The voltage problem of the power system is mainly related to the balance of system reactive power, but the change of active power will also affect the system voltage, and in severe cases, the system voltage will be unsafe. The system is in a process of constant change and certain disturbances can lead to large-scale fluctuations in voltage, and in severe cases can lead to unsafe voltage. Usually the voltage should be controlled within the range of 1.0~1.1pu. When the voltage changes suddenly and exceeds the allowable range, at present, the common practice at home and abroad is to control the voltage within a reasonable range by switching off the capacitive reactor. Except in extreme cases, the voltage safety is generally not improved b...
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Inventor 方勇杰刘福锁李威李兆伟赵理陈涛冯丽张同尊
Owner STATE GRID CHONGQING ELECTRIC POWER