Analysis Method of Quasi-steady State Reactive Power Sensitivity in Large Power Grid
An analysis method and voltage sensitivity technology, applied in reactive power compensation, AC network voltage adjustment, etc., can solve problems such as low efficiency, impact on power grid security operation, and time-consuming, to ensure calculation accuracy, network scale insensitivity, and calculation The effect of shortening the time
Active Publication Date: 2019-01-08
NARI TECH CO LTD
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However, when the nodes of the power grid increase, it is not only time-consuming, but also the efficiency is too low for real-time control of the power grid, which may also seriously affect the safe operation of the power grid.
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[0031] It will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0032] The steps of the analysis method of the quasi-steady-state reactive class sensitivity of the large power grid of the present invention are:
[0033] The first choice is to define the set of generator PV nodes in the whole network as Q, and the set of generator PQ nodes as D. Considering the reactive power of a generator node g and the voltage sensitivity of other PQ nodes, there are:
[0034]
[0035] where L DD is the admittance matrix of the PQ bus in the PQ decoupling method, L Dg Indicates the mutual admittance between generator node g and other PQ nodes, L gg is the self-admittance of generator node g; ΔV D is the variation of PQ bus node voltage; ΔV g is the voltage variation of the outlet bus node of the generator node g; ΔQ g is the reactive power variation of the generator node g outlet bus;
[0036] make According to the calculation pr...
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The invention discloses a large power grid quasi-steady state reactive sensitivity analysis method. Based on a quasi steady state sensitivity theory, the method only needs to form an augmented admittance matrix not differentiating any PV nodes when calculating quasi-steady state reactive sensitivity, and only needs to perform Gaussian elimination once on the augmented admittance matrix, wherein a correction term is equal to a column vector generated by a forward and backward substitution result after a current electric generator node uses a corresponding unit vector multiplied by an element corresponding to the electric generator node, and final sensitivity is an opposite number of the correction term. The method can guarantee calculating precision and substantially shorten calculation time; calculation time is insensitive to a network scale; the method effectively improves large power grid control instantaneity, accuracy and security.
Description
technical field [0001] The invention relates to the technical field of power system operation and control, in particular to a quasi-steady-state reactive sensitivity analysis method for a large power grid. Background technique [0002] Quasi-steady state reactive power sensitivity is an effective tool for voltage / reactive power optimization control, safety correction, and grid planning. In order to reflect the "quasi-steady state" characteristics of reactive power, the usual practice is to set the current generator node for calculating sensitivity as PQ node, and the remaining generator nodes are set as PV nodes or PQ nodes according to whether there is an AVR (automatic voltage regulator) device. In order to facilitate the calculation and facilitate the processing of generator node type conversion, it is necessary to increase the number on the diagonal elements of the admittance matrix corresponding to the remaining PV nodes. In this way, when considering the sensitivity o...
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IPC IPC(8): H02J3/16
CPCH02J3/16Y02E40/30
Inventor 杨洛黄华徐陆飞龚成明杜磊陈建华王毅陈天华
Owner NARI TECH CO LTD