A voltage control method based on the stability measurement index of DC inverter station
A voltage control method and DC inverter technology, applied in the direction of AC network voltage adjustment, reactive power compensation, etc., can solve problems such as large construction costs, excessive short-circuit current, unfavorable grid voltage stability, etc., to reduce reactive power demand, The effect of improving voltage stability margin and voltage operation level
Active Publication Date: 2017-05-10
STATE GRID CORP OF CHINA +2
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Problems solved by technology
In order to improve the voltage stability of the DC feed-in receiving end power grid, it is usually necessary to strengthen the power grid structure or add a dynamic reactive power compensation device. This measure requires a large amount of additional construction costs, and strengthening the power grid structure may also cause excessive short-circuit current and have adverse effects
[0004] When the DC inverter station is connected to the AC grid at the receiving end, its adverse impact on the grid voltage stability is due to the fact that after the voltage drop deviates from the rated operating state, the reduction of the capacitive reactive power output by the filter will be greater than that of the inverter without Therefore, the DC inverter station will show the characteristics of reactive power load and absorb reactive power from the AC grid, so that the margin between the maximum supply of the AC grid and the reactive power demand of the inverter station will be reduced, and the voltage loss will be reduced. Threats to stability increase accordingly
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[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0041] A voltage control method based on the stability measurement index of the DC inverter station, which is used to provide a quantitative evaluation index that characterizes the voltage stability margin of the DC inverter station, and utilizes the correlation characteristics of the reactive power consumption of the inverter station and its transmission active power and the fast speed of the DC power The control feature improves the voltage stability of the DC receiving end grid after being disturbed, including the following steps:
[0042] 1. Set voltage control parameters;
[0043] 2. Input the equivalent electrical parameters of the AC grid connected to the DC inverter station;
[0044] 3. Measure the operating parameters of the DC inverter station;
[0045] 4. Calculate the critical voltage and voltage stability measurement index of the DC inverter st...
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The invention provides a voltage control method based on direct current inverter station stability measurement indexes. The method includes the following steps that voltage control parameters are set; equivalent electrical parameters of an alternating current network connected with a direct current inverter station are input; operating parameters of the direct current inverter station are measured; critical voltages and voltage stability measurement indexes of the direct current inverter station are calculated; whether a direct current power control criterion is met or not is judged; direct current fallback control is conducted. According to a method for regulating and controlling the voltage stability measurement quantitative evaluation indexes and direct current power of the direct current inverter station, quick extra-high voltage direct current power regulation and control characteristics are utilized, inverter station reactive power requirements are lowered, even reactive power is output to the alternating current network, and therefore on the premise that dynamic reactive power compensation equipment and other primary equipment are not additionally arranged, the purpose of increasing the network voltage stability margin and the voltage operating level at the receiving end is achieved.
Description
technical field [0001] The invention relates to a voltage control method, in particular to a voltage control method based on a DC inverter station stability measurement index. Background technique [0002] HVDC transmission is an effective technical means for large-capacity and long-distance power transmission. The reverse distribution characteristics of my country's primary energy and load centers determine that HVDC transmission is an inevitable choice for west-to-east power transmission and optimal allocation of cross-regional resources. [0003] When a large-capacity DC inverter station is connected to a high-density load center, the problem of voltage stability will become an important factor that threatens the safe operation of the AC grid at the receiving end and the continuous and reliable power supply of the load. In order to improve the voltage stability of the DC feed-in receiving end grid, it is usually necessary to strengthen the grid structure or add a dynamic...
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IPC IPC(8): H02J3/16
CPCH02J3/16Y02E40/30
Inventor郑超刘洪涛林俊杰吴娅妮
OwnerSTATE GRID CORP OF CHINA