Calculation method of power flow in distribution network including dg grid connection

A technology for power flow calculation and distribution network, which is applied to AC network circuits, circuit devices, AC networks with the same frequency from different sources, etc.

Active Publication Date: 2019-12-03
NARI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] 1) The access of DG may change the flow direction of the power flow, and the distribution network will also change from a single power supply mode to a multi-power supply mode;

Method used

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  • Calculation method of power flow in distribution network including dg grid connection
  • Calculation method of power flow in distribution network including dg grid connection
  • Calculation method of power flow in distribution network including dg grid connection

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Embodiment Construction

[0050] The present invention will be further described below. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0051] A power flow calculation method of a distribution network including DG grid-connected in the present invention introduces bilinear variables through bilinear transformation technology, thereby transforming the power flow nonlinear equations into linear-nonlinear mixed equations, further, combining Due to the operation characteristics of the distribution network of DG, a reasonable approximation is made to the Jacobian matrix in the mixed equation, so that the Jacobian matrix is ​​constant and the solution speed is accelerated.

[0052] A method for calculating the power flow of a distribution network containing DG grid-connected according to the present invention, the specific process is as follows:

[0053] Assume that a grid-conne...

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Abstract

A method for determining a power flow of a DG-connected distribution network and a computer storage medium. The method comprises: establishing, on the basis of parameters of N nodes in a DG-connected system, a nonlinear power flow equation for the system, and converting the nonlinear power flow equation to a linear-nonlinear hybrid equation for the system (11), wherein N is a positive integer; and determining, on the basis of the definition of a bilinear state variable and a solution of the linear-nonlinear hybrid equation for the system, phase differences between and voltages of the N nodes and phase differences between N-1 nodes (12).

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to a power flow calculation method of a distribution network including DG grid connection. Background technique [0002] Power flow calculation is one of the most basic functions in energy management system (EMS), and distribution network power flow calculation is an important basis for distribution network economic operation and system analysis. In terms of topology and operation mode, the distribution network is significantly different from the transmission network. The distribution network has a high R / X ratio (resistance-to-reactance ratio), many branches, and a radial network structure. In addition, the normal operation of the distribution network is an open loop, and only a short-term ring network or dual power supply operation occurs when there is a fault or load adjustment. [0003] Distributed generation (DG) technology has gradually become a res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 杨洛徐陆飞陈天华陈建华杜磊
Owner NARI TECH CO LTD
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