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Interconnected power grid power flow synchronous iterative computation method and related device

A technology of synchronous iteration and interconnected power grids, applied in the direction of circuit devices, electrical components, AC network circuits, etc., can solve the problems of waiting for each other, poor calculation efficiency of synchronous iterations, and large influence of power flow calculations

Active Publication Date: 2020-09-08
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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  • Interconnected power grid power flow synchronous iterative computation method and related device
  • Interconnected power grid power flow synchronous iterative computation method and related device
  • Interconnected power grid power flow synchronous iterative computation method and related device

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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 invention discloses an interconnected power grid power flow synchronous iterative calculation method and a related device. The method comprises the steps of S1, calculating the updated power mismatch amount of each subnet through the subnets according to a preset state variable value, a power preset value and a first preset camouflage correction equation, and synchronizing the updated power mismatch amount to a superior control center; S2, solving an updated state variable increment value through the superior control center according to the updated power mismatch amount and a second presetcamouflage correction equation, and synchronizing the updated state variable increment value to the subnet; S3, calculating an updated state variable value through the subnet according to the updatedstate variable increment value, judging whether iteration is terminated or not according to the updated state variable value and a preset iteration termination condition, if so, taking the updated state variable value as an iterative calculation result, and if not, replacing the preset state variable value with the updated state variable value, and repeating the steps S1-S2 until the preset iteration termination condition is met. The technical problems that an existing synchronous iteration technology is poor in calculation efficiency and low in applicability can be solved.

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 Applications(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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