Unit difference adjustment coefficient optimization method and device based on transient voltage sensitivity sorting

Abstract

The invention relates to a unit difference adjustment coefficient optimization method and device based on transient voltage sensitivity sorting. The method comprises the following steps of calculatingthe bus voltage boosting rate of each unit in a receiving-end power grid at different difference adjustment coefficients, and obtaining a transient voltage sensitivity index based on the bus voltageboosting rate; sorting the transient voltage sensitivity indexes of all the units from high to low, and preferentially adjusting the difference adjustment coefficient of the unit sorted in the front based on a set lifting effect target and a set difference adjustment coefficient setting range to obtain an optimal difference adjustment coefficient scheme meeting all operation constraints of the power grid at the same time. Compared with the prior art, the method has the advantages of more accurate reactive support adjustment, high economy and the like.

Description

technical field [0001] The invention relates to a dynamic reactive power compensation technology of a power grid, in particular to a method and equipment for optimizing a unit adjustment coefficient based on transient voltage sensitivity sorting. Background technique [0002] The power grid needs a lot of dynamic reactive power support. For example, DC commutation failure and recovery process will absorb a large amount of reactive power from the system. If the commutation failure leads to DC blocking, it will have an impact on the stability of the power grid. Large-capacity AC and DC power input requires a certain amount of reactive power to be supported by the receiving grid, but reactive power cannot be transmitted over long distances. Insufficient local dynamic reactive power capacity of the power grid will cause insufficient voltage support when the AC line fails or the high-power DC line is blocked, and then the grid voltage will continue to decrease, and finally the vo...

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Problems solved by technology

These methods have the following problems: 1) the construction of synchronous condenser requires a lot of investment, and the operation is not economical; 2) STATCOM is complicated to control, the device capacity is relatively small, and the cost is expensive, and the failure rate of on-site operation is too high; 3) AVC The system is based on the optimization calculation of the whole network. The control of this strategy has the characteristics of time lag, but the response time is generally above the second level, and its control equipment can only realize step and segment control, which is difficult to achieve precise adjustment, and for dynamic reactive power The technical requirements for support have not yet formed an overall requirement

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