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A method for synchronous iterative calculation of power flow in an interconnected power grid and related devices

A technology of synchronous iteration and interconnected power grids, which is applied in the direction of circuit devices, electrical components, AC network circuits, etc., can solve problems such as low applicability, large influence of power flow calculation, and poor efficiency of synchronous iterative calculation

Active Publication Date: 2022-03-01
GUANGDONG POWER GRID CO LTD
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Problems solved by technology

[0004] This application provides a power flow synchronous iterative calculation method of an interconnected power grid and related devices, which are used to solve the need for subnetwork calculations to wait for each other in the existing synchronous iterative technology, and the convergence of subnetwork calculations has a greater impact on the power flow calculation of the entire system. Technical problems that lead to poor calculation efficiency and low applicability of synchronous iteration

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  • A method for synchronous iterative calculation of power flow in an interconnected power grid and related devices
  • A method for synchronous iterative calculation of power flow in an interconnected power grid and related devices
  • A method for synchronous iterative calculation of power flow in an interconnected power grid and related devices

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Embodiment 1

[0046] For ease of understanding, see figure 1 , Embodiment 1 of an iterative calculation method for power flow synchronization in an interconnected power grid provided by the present application, including:

[0047] Step 101. Calculate the updated power mismatch of each subnetwork through the subnetwork according to the preset state variable value, power preset value and the first preset pseudo-fitting equation, and synchronize to the upper control center. The upper control center includes the second preset Set the pseudo-fitting equation.

[0048] It should be noted that the preset state variable value here is the initial state variable value in the sense of actual iterative calculation. During the subsequent iterative calculation process, the state variable value will be updated continuously until the iteration stops; node power preset The set value includes active power and reactive power; the first preset pseudo-fitting positive equation is obtained by camouflaging the b...

Embodiment 2

[0054] For ease of understanding, see figure 2 , the present application provides a second embodiment of an iterative calculation method for power flow synchronization in an interconnected power grid, including:

[0055] Step 201, constructing a preset basic power flow equation according to the node set of the subnetwork, the node set includes an internal node set and an edge node set.

[0056] It should be noted that the set of subnets is defined as Q=1,2,...,A, where A is the number of subnets, and the total node set of each subnet is iD. The total node set can be divided into Internal node set iα and edge node set iβ, where iD=iα∪iβ, iα∩iβ=φ, the specific node set is defined as follows:

[0057]

[0058] Among them, J(m) is the set of all adjacent nodes of internal node m, and J(n) is the set of all adjacent nodes of edge node n; adjacent nodes refer to nodes that have direct topological connections with this node . Taking subnetwork i as an example, the basic power ...

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Abstract

The present application discloses an iterative calculation method for synchronous power flow of an interconnected power grid and related devices. The method includes: S1: Calculate the update of each subnet through the subnet according to the preset state variable value, the power preset value and the first preset pseudo-rectification equation power mismatch, and synchronize to the superior control center; S2: through the superior control center to solve and update the incremental value of the state variable according to the updated power mismatch and the second preset pseudo-fitting equation, and synchronize to the subnet; S3: through the subnet The network calculates the updated state variable value according to the incremental value of the updated state variable, and judges whether to terminate the iteration according to the updated state variable value and the preset iteration termination condition. The variable value replaces the preset state variable value, and steps S1‑S2 are repeated until the preset iteration termination condition is satisfied. The application can solve the technical problems of poor calculation efficiency and low applicability of the existing synchronous iteration technology.

Description

technical field [0001] The present application relates to the field of power system power flow calculation, in particular to a method for synchronous iterative calculation of power flow in an interconnected power grid and a related device. Background technique [0002] With the rapid development of smart grids, modern power grids are gradually interconnected, and the dispatching and control of power grids are distributed in layers. In order to ensure the correct calculation results, the energy management centers (Energy Management System, EMS) of multiple control centers need to adopt the calculation mode of decomposition and coordination. [0003] In order to adapt to this hierarchical distributed computing environment, there are currently several decomposition and coordination computing modes including synchronous iteration, asynchronous iteration, and real-time tracking equivalent. In the current synchronous iteration mode, due to the different sizes of each subnetwork, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/10H02J2203/20
Inventor 冯歆尧彭泽武谢瀚阳杨秋勇梁盈威
Owner GUANGDONG POWER GRID CO LTD
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