External network equivalence method for electric power system applicable to subsynchronous resonance
A subsynchronous resonance, power system technology, applied in the field of value, can solve problems such as deviating from the equilibrium operating state, and achieve the effects of simplified processing method, simple and convenient parameter acquisition, and easy implementation.
Inactive Publication Date: 2012-06-27
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
At present, the equivalent external network in the form of an infinite power supply with impedance branches is generally used for SSR problems, and its equivalent power supply parameters are usually approximated by reference values. For example, for a 500kV series-compensated transmission system, the equivalent power supply voltage is set to , the equilibrium operating state of the equivalent system using this parameter often deviates from the equilibrium operating state of the system before the equivalence
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[0037] This example is used for the external network equivalent value in the SSR risk assessment of the Southern Power Grid, focusing on the SSR problem between the Mojiang-Honghe and Yanshan-Chongzuo series compensation and the adjacent Xiaolongtan and inspection department power plant units. The external network The specific steps of equivalent value are as follows:
[0038] Step 1: Reserving several units and series-compensated transmission lines of the power system to obtain the preliminary range and equivalent boundary points of the external network equivalent.
[0039] The reservation process is: take the reserved unit and the series compensation transmission line as the center, and take the area of the transformer substation with one to two main grid voltage levels away from the unit and the series compensation station as the reserved area, wherein: the initial value of the external network equivalent The scope is the area composed of the reserved area, the unit and t...
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The invention provides an external network equivalence method for an electric power system applicable to subsynchronous resonance, belonging to the technical field of the electric power system. The method comprises the following steps: retaining a plurality of units and series compensation transmission circuits of the electric power system to obtain a primary range of external network equivalence, and an equivalent boundary point; obtaining equivalent impedance after an equivalent boundary point; simplifying mutual impedance branches among a plurality of equivalent boundary points; obtaining an equivalent power parameter of the external network; obtaining the system subsynchronous frequency impedance which is Z1(f) by seeing from the units to a network side in the primary range of external equivalence; expanding a plurality of scales to obtain a system subsynchronous frequency impedance which is Z2(f) by seeing from the units to the network side in a new range of the external network;and determining whether to expand equivalent scales or not by judging the Z1(f) and the Z2(f) so as to obtain an external equivalent result. The method can improve the accuracy of the subsynchronous resonance result, and has important engineering application value in formulation of SSR control strategy and safe and stable operation of the system.
Description
technical field [0001] The present invention relates to a method in the technical field of electric power system, in particular to an equivalent method for external network of electric power system applicable to subsynchronous resonance. Background technique [0002] As an economical and effective means of large-capacity and long-distance power transmission, series compensation transmission technology is equivalent to shortening the electrical distance of the line, thereby improving line transmission capacity, improving system stability, and saving line corridor resources. With the implementation of my country's west-to-east power transmission plan and the development and construction of large-scale thermal power bases in the north, it has become a common transmission mode in my country to use large-capacity turbo-generator sets to transmit power through series-compensated transmission lines. However, while the series compensation transmission technology brings huge economic...
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IPC IPC(8): H02J3/24
Inventor 王西田岑海凤杨煜
Owner SHANGHAI JIAOTONG UNIV