A Calculation Method for Coordinated Reactive Power Backup of UHV DC Near-area Power Grid by National Division and Province

Abstract

The invention discloses a national, grid and provincial dispatching cooperative reactive backup calculation method for an ultra-high-voltage direct-current near-region power grid. The cooperative reactive backup calculation method comprises the following steps that: a national dispatching part works out convertor station alternating current bus voltage safety upper and lower limit values and reactive backup capacity demand in a rolling manner, and issues the calculation result to a grid dispatching part; a provincial dispatching part adopts a sensitivity evaluation method to convert effectivereactive backup capacity of the direct-current near-region power grid into a transformer medium voltage side of a transformer substation in a grid-provincial dispatching junction, and transmits the converted reactive backup capacity to the grid dispatching part; and the grid dispatching part cooperatively works out a grid dispatching reactive backup expected target and a provincial dispatching reactive backup expected target according to the convertor station alternating current bus voltage safety upper and lower limit values and reactive backup capacity demand issued by the national dispatching part, and the reactive backup capacity from the provincial dispatching part. By adoption of the method, through the reactive backup capacity of the ultra-high-voltage direct-current near-region power grid, influence of abnormality and a fault condition of an alternating current direct current hybrid power system to the ultra-high-voltage near-region power grid is lowered, and safe and stable operation capability of the alternating current direct current hybrid power system is improved.

Description

technical field [0001] The present invention relates to a method for calculating reactive power reserve of UHV DC near-area coordinated national sub-provincial power grid, in particular to a coordinated voltage control method for UHV AC-DC hybrid power system national dispatch, sub-dispatching (network dispatch) and provincial dispatch, The invention belongs to the technical field of electric power system automatic voltage control. Background technique [0002] my country's primary energy and load are distributed in reverse. In order to meet the urgent needs of large-scale clean energy transmission such as southwest hydropower and northwest wind power, load center power supply, energy conservation and emission reduction, etc., the State Grid vigorously develops suitable for long-distance and large-capacity transmission. UHV AC and DC technology. By the end of 2016, the UHV operation scale of the State Grid will reach "six AC and five DC", and it is the only power grid in the...

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Problems solved by technology

However, this patent does not involve the reactive power reserve optimization of national, branch and provincial coordination, and does not take into account that the joint reactive power reserve of national, branch and provincial regulation plays an important role in supporting the reactive power of the UHVDC near area.

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