A start-up voltage value optimization method for commutation failure predictive control

Abstract

The invention discloses a commutation failure prediction control starting voltage value optimization method, which comprises the following steps of: simulating and calculating the power impact of primary commutation failure of each loop of direct current, and calculating a power impact contribution degree index, calculating a reactive influence degree index according to the direct-current operation state and the equivalent impedance matrix of the receiving-end alternating-current power grid, calculating parameter setting priority indexes, and sorting the indexes from large to small, and determining a commutation failure prediction control starting voltage value of each loop of direct current. The method provided by the invention can effectively reduce the overall power impact caused by commutation failure, and avoids adverse effects on the voltage stability of the receiving-end alternating-current power grid caused by overlarge multi-loop direct-current reactive power demand at the same time.

Description

technical field [0001] The invention relates to the field of power system stability analysis and control research, in particular to a starting voltage value optimization method for commutation failure prediction control. Background technique [0002] In order to meet the increasing demand for electricity in load centers, high-voltage direct current transmission projects with the advantages of large-capacity and long-distance transmission receive external power, so as to realize the optimal allocation of energy across regions, which is an effective means to alleviate the pressure on energy supply in load center areas. However, the multi-infeed DC system formed by multiple DC feeds into the AC grid has brought new problems to the safety and stability of the grid. The failure of multi-circuit DC commutation caused by the failure of the AC grid at the receiving end is one of the important problems in the multi-infeed DC system, and the power shock and voltage fluctuation caused ...

AI Technical Summary

Problems solved by technology

At present, there are relatively few studies on predictive control of commutation failure, and they are mainly based on the improvement of single-circuit DC, without considering the overall impact of multi-circuit DC on the reactive power and voltage stability of the AC power grid at the receiving end.

Related studies have shown that the change of commutation failure prediction control parameters has an important impact on the reactive power interaction characteristics of AC and DC systems, and even causes voltage instability at the receiving end grid in severe cases.

[0004] It can be seen that the method of coordinating and optimizing the commutation failure prediction and control of multi-circuit DC still faces a blank in the current research considering the power impact and reactive power demand comprehensively.

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