Transmission and distribution cooperative power flow calculation method based on least square method fitting correction

A technology of least squares method and power flow calculation, which is applied to AC networks, AC network circuits, and electrical components of the same frequency with different sources. Convergence performance and other issues to achieve the effect of improving efficiency and robustness, strong operability, and easy implementation

Active Publication Date: 2021-02-19
ZHEJIANG UNIV
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Problems solved by technology

However, with the development of the active distribution network, the disturbance of the distribution network to the transmission network is relatively large, that is, the root node (boundary node) of the distribution network injects power with high sensitivity to the voltage amplitude of the root node, and the traditional master-slave split The method cannot guarantee the convergence performance

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  • Transmission and distribution cooperative power flow calculation method based on least square method fitting correction
  • Transmission and distribution cooperative power flow calculation method based on least square method fitting correction
  • Transmission and distribution cooperative power flow calculation method based on least square method fitting correction

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[0021] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, the method of the present invention includes seven main steps: initialization, distribution network power flow calculation, transmission network power flow calculation, convergence test, fitting correction based on the least square method, current iteration number update, and maximum iteration number check.

[0023] Step S1: Set the initial value of the boundary node voltage amplitude Initial value of voltage phase angle Set the convergence accuracy η; set the maximum iteration number K; set the current iteration number k=0.

[0024] Step S2: According to the current boundary node voltage amplitude and voltage phase angle Use the forward push back method to calculate the power flow of the distribution network, and obtain the node voltage amplitude of each node of the distribution network an...

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Abstract

The invention discloses a transmission and distribution cooperative power flow calculation method based on least square method fitting correction. The method comprises the following seven main steps of initialization, power distribution network power flow calculation, power transmission network power flow calculation, convergence inspection, fitting correction based on a least square method, current iteration frequency updating and maximum iteration frequency inspection. According to the method, the least square method is used for carrying out fitting correction on the iteration variables, theefficiency and robustness of the whole transmission and distribution cooperative load flow calculation algorithm can be remarkably improved, and especially when the disturbance of a power distribution network to a power transmission network is larger, namely the sensitivity of boundary node injection power relative to the boundary node voltage amplitude is higher, the problem of divergence of a traditional master-slave splitting method can be solved.

Description

technical field [0001] The invention relates to a power flow analysis method for a power grid, a global power flow analysis method for the coordination of a transmission network and a distribution network, and in particular to a method for calculating a power flow for transmission and distribution coordination based on least square method fitting correction. Background technique [0002] In the traditional dispatching mode, the transmission and distribution network is managed by different dispatching departments, and the analysis and calculation are also carried out independently. However, with a large number of distributed power sources connected, the coupling between the transmission network and the distribution network is greatly enhanced. This traditional independent analysis and calculation mode lacks synchronization and cannot meet the requirements of calculation accuracy. Therefore, the transmission network and the distribution network need to cooperate to calculate t...

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/10H02J2203/20
Inventor 唐坤杰董树锋
Owner ZHEJIANG UNIV
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