AC-DC grid voltage sensitivity calculation method considering DC reactive power control characteristics

Abstract

The invention discloses an AC-DC grid voltage sensitivity calculation method considering DC reactive power control characteristics, which comprises the steps of building a power flow calculation model of an AC-DC grid; building a DC reactive power compensation capacity calculation model according to different reactive power control strategies of a DC converter station; solving the power flow calculation model of the AC-DC grid by using a power flow algorithm to obtain a steady-state operating point of the AC-DC grid; and calculating the sensitivity of a reactive power compensation device in the DC converter station for voltage of the AC-DC grid according to the calculated steady-state operating point. The AC-DC grid voltage sensitivity calculation method improves the calculation accuracy while ensuring the convergence, enables the steady-state operating point to more conform to actual grid operating conditions, and thus improves the accuracy of the grid reactive voltage sensitivity.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a method for calculating the voltage sensitivity of an AC-DC power grid considering the characteristics of DC reactive power control. Background technique [0002] As a mature and reliable long-distance and large-capacity power transmission technology, DC transmission plays an important role in the optimal allocation of energy resources in my country. In 2020, dozens of circuits of DC transmission projects will be built in my country. It is inevitable that multiple circuits of DC transmission will be placed on the same AC receiving end, forming a grid structure under complex AC-DC hybrid conditions. [0003] The calculation of reactive power and voltage sensitivity of the power grid has an important impact on the calculation of reactive power compensation capacity, and the accurate power flow calculation results are the basis for the calcula...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantage of ignoring the DC reactive voltage control strategy in the calculation of the reactive voltage sensitivity of the existing AC and DC power grid, resulting in low accuracy of the calculation results, the present invention proposes a voltage sensitivity of the AC and DC power grid that takes into account the characteristics of the DC reactive power control The calculation method, according to the reactive power compensation capacity and control strategy of the DC converter station, takes into account the influence of different control strategies on the grid voltage in the power flow calculation of the AC-DC grid decoupling method, which improves the calculation accuracy while ensuring convergence. Make the steady-state operating point more in line with the actual grid operation, thereby improving the accuracy of grid reactive voltage sensitivity

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