A dynamic reactive power reserve optimization method to improve the safety level of DC commutation

Abstract

The invention provides a dynamic reactive standby optimization method for increasing the safety level of direct current commutation. The method includes the following steps that a key fault set and a key direct current inversion side converter station node set affecting the safety level of direct current commutation are determined, and all key direct current inversion side converter station nodes are sequenced; reactive output of generators is adjusted, and the reactive voltage control sensitivity of the generators is calculated; the m generators are sequenced, and the weight coefficient of the generators is calculated; reactive standby capacities of the generators are calculated, and a dynamic reactive standby optimization model is established and solved. The dynamic reactive equipment standby capacities are reasonably set, and the safety level of direct current commutation can be effectively increased; the dynamic characteristic of a system is considered in detail, the dynamic reactive compensation equipment standby capacities can be determined more accurately, and a basis is provided for optimization operation of a power grid.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a dynamic reactive power backup optimization method for improving the safety level of DC commutation. Background technique [0002] DC transmission has the advantages of long-distance, large-capacity transmission, and flexible control and adjustment, so it is used for the interconnection of large-scale power grids and has become one of the main transmission channels for "West-to-East Power Transmission". With the orderly advancement of UHV power grid construction, by 2015, UHV and cross-regional and transnational power grid transmission capacity will be 261 million kilowatts, and UHV AC and DC will undertake more than 80% of the power transmission. Ultra-high voltage AC and DC have been greatly improved, which puts forward higher requirements on the ability of AC channels to withstand power flow transfer. The "Sanhua" receiving-end power grid will receive power...

AI Technical Summary

Problems solved by technology

The switching speed of the fixed capacitor bank is slow, and the converter station is prone to excess reactive power when it is under load, resulting in overvoltage of the converter bus;

[0007] (2) The power grid at the receiving end is weak

However, synchronous condensers have disadvantages such as high cost, long response time, low reliability, and rapid output reduction when the system is faulty. Therefore, it is necessary to find a method to improve the stability of the DC transmission system connected to the weak receiving end. very important

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