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On-line combination method for multi-region electric network tide model

A power grid model and power flow model technology, applied in the field of power flow matching, can solve problems such as the inability to correctly establish a global power grid model online, and achieve the effect of ensuring safe operation

Inactive Publication Date: 2009-12-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to solve the problem that the traditional EMS cannot correctly establish the global power grid model online, and also to meet the new requirements of the new generation of EMS for establishing the global power grid power flow model, and propose an online merging method for multi-region power grid power flow models, which can be used in power systems At present, the high-speed data communication network that has been built between the power grid dispatching centers performs the grid model interaction between the jurisdictional power grid and the non-jurisdictional power grid, and uses the matching power flow method to adjust the non-jurisdictional power flow model to realize the jurisdictional power grid and non-jurisdictional power grid. Undisturbed merging of power flow models between jurisdictional power grids ensures that the state of the jurisdictional power grid in the merged global power grid power flow model is completely consistent with its real-time state

Method used

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  • On-line combination method for multi-region electric network tide model
  • On-line combination method for multi-region electric network tide model
  • On-line combination method for multi-region electric network tide model

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1: The injection of active power P and reactive power Q by adjusting the internal nodes of the lower-level power grid specifically includes the following steps:

[0041] (1) Put the lower-level power grid boundary nodes (such as figure 2 b) i, j, k) are set as Vθ given nodes, the set of nodes is defined as S, and its voltage amplitude V and voltage phase angle θ are set to the boundaries of the upper-level grid in the real-time power flow of the upper-level grid given by the upper-level grid dispatching center The corresponding magnitude of the node ( figure 2 3) of b); set other nodes in the lower-level power grid as PQ nodes, and set the PQ given power value as the original power flow result value in the lower-level power grid, and perform power flow calculation of multiple Vθ nodes in the lower-level power grid to obtain the injection of the boundary nodes of the lower-level power grid Active power P S and reactive power Q S , there is a deviation ΔP ...

Embodiment 2

[0065] Embodiment 2: A method for adjusting the active power P injected into the internal nodes of the lower-level power grid and the node voltage amplitude V. The specific method is:

[0066] (1), put the lower-level power grid boundary nodes (such as figure 2 b) i, j, k) are set to a given node Qθ, the node set is defined as S, its node injected reactive power Q and node voltage phase angle θ are set to the corresponding values ​​of the upper-level power grid boundary nodes in the real-time power flow of the upper-level power grid ( figure 2 3) of b), and use the following constraint equation to calculate the power flow:

[0067] θ i sp = θ i Q i sp = V ...

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Abstract

The invention relates to an online merging method of multi-area power flow models, and belongs to the field of electric power system scheduling automation. The method includes: the upper-level and lower-level power grid dispatching centers use the state estimation method to automatically generate the internal power grid model and power flow distribution in the region according to the real-time data of the power grid under their jurisdiction, and at the same time establish the equivalent model of the external power grid connected to it, and transmit the described power grid through the wide area network. The lower-level grid model and power flow data are sent to the upper-level grid dispatching center; the upper-level grid model and each lower-level grid model are connected through the connection line between them, and the upper-level grid model and the lower-level grid model are combined into a global grid model for calculation; use the power flow matching method Adjust the power flow of the lower-level power grid model to obtain the global power grid power flow model. This method ensures that the power flow of the superior power grid in the combined global power grid model remains unchanged. The invention can ensure the correctness of online safety analysis and simulation calculation results of the interconnected power grid, and is of great significance for ensuring the safe operation of the power grid.

Description

technical field [0001] The invention belongs to the technical field of electric power system dispatching automation, and relates to an online merging method of multi-regional power grid power flow models in a power system, and a matching power flow method for ensuring that the upper-level power grid flow in the merged global power grid model is consistent with the real-time state of the upper-level power grid. Background technique [0002] The modern power grid is composed of multiple regional grid interconnections, and the impact of accidents on the power grid is global. However, at present, the management of the power grid is carried out in different levels and regions, and the power grid under the jurisdiction of each dispatch center is only a part of the large power grid. At present, the energy management system (EMS) of the power grid dispatching center only models the power grid in its own jurisdiction, and uses the real-time telemetry and telemetry of the power system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 张伯明吴文传孙宏斌蒋维勇
Owner TSINGHUA UNIV