Method and device for calculating three-phase asymmetric short-circuit current of distribution network considering photovoltaic
A short-circuit current and short-circuit calculation technology, which is applied to the elimination/reduction of asymmetry in multi-phase networks, photovoltaic power generation, circuit devices, etc., can solve the problem of low accuracy of distribution network asymmetry and short-circuit calculation, and achieve the effect of improving accuracy
Pending Publication Date: 2022-05-20
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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[0004] The invention provides a method and device for calculating the three-phase asymmetric short-circuit current of a distribution network considering photovoltaics, which is used to solve the technical problem of low calculation accuracy of the asymmetric short-circuit calculation of a distribution network containing photovoltaics
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[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0015] see figure 1 , which shows a flow chart of a method for calculating a three-phase asymmetric short-circuit current of a distribution network considering photovoltaics in the present application.
[0016] Such as figure 1 As shown, the specific steps of the calculation method of the three-phase asymmetric short-circuit current of the distr...
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The invention discloses a photovoltaic-considered distribution network three-phase asymmetric short-circuit current calculation method and device, and the method comprises the steps: carrying out the power flow calculation before a fault, and obtaining the node voltage and injection current of each node including a photovoltaic node during the normal operation; according to Norton equivalence, enabling a power supply to be equivalent to a current source, enabling a load to be equivalent to impedance, calculating an admittance array based on an equivalent circuit model after a three-phase asymmetric short-circuit fault occurs, and constructing a photovoltaic short-circuit calculation node impedance network equation suitable for Gaussian iteration; nonlinear segmented expressions of new energy node voltage and current are combined, the current and the voltage during a new energy fault are solved through an iteration method, and then fault short-circuit current is solved. By constructing admittance matrixes and corresponding voltage and current expressions under respective conditions of a single-phase grounding short circuit and a two-phase interphase short circuit and utilizing iterative calculation to deduce a final result, the calculation accuracy is improved.
Description
technical field [0001] The invention belongs to the technical field of power system failure analysis, and in particular relates to a method and device for calculating a three-phase asymmetric short-circuit current of a distribution network considering photovoltaics. Background technique [0002] Distributed generation has been widely used in power systems due to its environmental friendliness, high power generation efficiency, and convenient installation. In order to cope with the increasingly severe energy crisis, photovoltaic and wind power are developing most rapidly. When photovoltaics are connected to the distribution network on a large scale, the distribution network will change from a single-source and few-ring network to a multi-source and multi-ring network, and the traditional short-circuit calculation method of the distribution network will no longer be applicable. The traditional power grid fault analysis method is mainly based on the symmetrical component metho...
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IPC IPC(8): H02J3/26H02J3/06H02J3/38G06F17/16
CPCH02J3/26H02J3/06H02J3/381G06F17/16H02J2203/20H02J2300/24Y02E10/56
Inventor 张妍熊华强邹进桂小智谢国强郭亮
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST