Determination Method of Node Injection Power Sensitivity Coefficient in Power System
A technology for node injection power and sensitivity coefficients, applied in the field of electrical engineering
Active Publication Date: 2019-04-16
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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[0003] The invention provides a method for determining the sensitivity coefficient of power system node injection power, which solves the technical problem of coordinated control between multiple direct currents or direct currents and multiple energy storage and emergency loads
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[0053] The method for determining the power system node injection power sensitivity coefficient includes the following steps:
[0054] In the first step, the relationship expression between the injected power of network nodes and the voltage amplitude and phase angle of each node is:
[0055]
[0056]
[0057] In the formula, i=1,2,...,n, P i , Q i Respectively, the active power and reactive power of node i in the network, V i is the voltage amplitude of node i, V j is the voltage amplitude of node j, G ij is the mutual conductance between nodes i and j, B ij is the mutual susceptance between nodes i and j, G ii is the self-conductance of node i, B ii is the self-susceptance of node i, θ ij = θ i -θ j , is the node i, j voltage phase angle θ i , θ j The phase angle difference between;
[0058] The second step is to linearize the node power equation, which can be obtained:
[0059]
[0060] Where: ΔP = [ΔP 1 ΔP 2 …ΔP n ] T , ΔQ=[ΔQ 1 ΔQ 2 …ΔQ n ] T...
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The invention discloses a determination method of a power system node injection power sensitivity coefficient and a coordination control method between multiple AC or DC and different energy storage and emergency loads in AC and DC system fault and emergency conditions. Since the electromagnetic power change of a motor to be researched caused by the injection of a unit power of a node is the sensitivity of a node injection power to a generator electromagnetic power, and the nodes into which power is injected, the size of the injection power, a power injection time and continuous time, and the coordination between multiple node injection powers can be determined according to the sensitivity. The calculation process of the node injection power sensitivity coefficient is as follows: according to a given grid, a full network nodal admittance matrix is generated; an initial flow is calculated, and the voltage and current amplitude phase angle initial values of each generator machine end are obtained; based on machine end voltage and current, a generator transient electromotive force and a generator work angle initial value are calculated; and a sensitivity coefficient matrix is calculated, and transient stability of the system in and emergency cases is improved.
Description
technical field [0001] The invention belongs to the technical field of electrical engineering, and relates to power coordination control under operating faults and emergency states of AC and DC power systems, and in particular to a method for determining sensitivity coefficients of power system node injection power. Background technique [0002] EHV / UHV DC transmission technology has been vigorously promoted and applied in my country's west-to-east power transmission and regional grid interconnection, and some typical grid structures with distinctive characteristics have been formed, such as the Southwest Hydropower Base's power transmission through three UHV DCs. DC external transmission system, AC-DC hybrid external transmission system for wind and solar thermal power in Northwest China via UHV AC-DC channels, AC-DC hybrid system for multi-DC feed-in / multi-DC external transmission in Central China, multi-DC channel feed-in and receiving end in East China Power system, the pl...
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IPC IPC(8): H02J3/28
CPCH02J3/001H02J3/28
Inventor 李瑞马振国郑惠萍江涵刘新元史宇欣王亮张伟张晓鹏张建伟穆国行蔡伟伟杨云峰孙海顺郝鑫杰吴攀郭惠东
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER