Multi-energy cooperative active splitting control method for power distribution network

A control method and technology of distribution network, applied in the direction of power network operating system integration, photovoltaic power generation, electrical components, etc., can solve the problems of reducing distribution network load and rarely researched.

Active Publication Date: 2021-06-08
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, after considering the multi-energy complementary effect, the multi-energy coupled energy system provides power support for the distribution network by coordinating multiple types of energy in the event of a fault, and reduces the energy supply of the distribution network by switching the energy supply methods of the heat and cold networks. Load plays an important role in improving the system fault recovery effect, but there is little research in this area

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  • Multi-energy cooperative active splitting control method for power distribution network
  • Multi-energy cooperative active splitting control method for power distribution network
  • Multi-energy cooperative active splitting control method for power distribution network

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A distribution network active splitting control method considering multi-energy coupling, see figure 1 , the method includes the following steps:

[0044] 101: Establish a multi-energy flow network model of the distribution network considering multi-energy coupling, and use the alternate iteration method to solve it to obtain the initial multi-energy flow of the system;

[0045]102: On the basis of the initial multi-energy flow of the system, according to the type of coupling elements in the system, propose an alternative control strategy and a coordinated control strategy, deeply explore the role of multi-energy synergy in the system, and actively decouple the power supply support for the distribution network to improve Distribution network power supply restoration, and on this basis, solve the multi-energy flow of the system, obtain the coupling components in the system, the output of each distributed power source, and the load distribution in the distribution network...

Embodiment 2

[0050] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and examples, see the following description for details:

[0051] 201: Establish a distribution network multi-energy flow network model and solve it considering multi-energy coupling;

[0052] Wherein, the step 201 includes:

[0053] 1) Distribution network model

[0054] a) Distribution network topology model

[0055] Express the topological structure of distribution network in the form of node weighting tree, that is, T(V,E,W). Among them, V, E, and W respectively represent the collection of nodes, edges, and node weights. The weight W of a node can be expressed as:

[0056] W(v i ) = ω(S Gi -S Li ) (1)

[0057] In the formula: ω is the node v i the weight of S Gi , S Li Respectively represent the node v i The sum of the injected power of the connected power supply and the sum of the power of the connected load.

[0058] b) Distribution network power f...

Embodiment 3

[0171] The scheme in embodiment 1 and 2 is carried out feasibility verification below in conjunction with specific example, see the following description for details:

[0172] This method takes image 3 The PG&E69-node power distribution system, 32-node thermal system, and 11-node natural gas system composed of SOP and IEEE33-node distribution system are shown as an example to verify the proposed distribution network active decoupling strategy accuracy and effectiveness. image 3 The coupling elements in the system shown include gas turbines, CHP units, electric boilers and gas boilers, and their distribution is shown in Table 1 below; in the PG&E69 node power distribution system, nodes 5 and 36 are connected to photovoltaic power sources. The safety constraints in the system are: the voltage constraint of the power system is 0.95-1.05p.u.; the pressure constraint of the natural gas system is 20-75mBar, and the pipeline flow constraint is 1400m 3 / h; the mass flow rate const...

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Abstract

The invention discloses a multi-energy cooperative power distribution network active splitting control method which comprises the following steps: establishing a power distribution network multi-energy flow network model considering multi-energy coupling, and solving by adopting an alternating iteration method to obtain initial multi-energy flow; on the basis of the initial multi-energy flow, proposing a replacement control strategy and a coordination control strategy according to the type of the coupling element, solving the multi-energy flow, and obtaining the coupling element, the output of each distributed power supply and the load distribution condition in the power distribution network; on the basis of adopting the replacement control strategy and the coordination control strategy, establishing a power distribution network active splitting model considering multi-energy coupling by taking the maximum load recovery amount as a target and taking a safe operation condition as a constraint; and adopting a greedy algorithm to solve the power distribution network active splitting model, obtaining a power distribution network island division scheme under the fault condition, and then carrying out active splitting to achieve the continuous power supply for power distribution network load under the fault condition.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a multi-energy coordinated distribution network active splitting control method. Background technique [0002] Active decoupling of distribution network as one of the most effective power restoration strategies [1] , in the event of a fault, it can guarantee the continuous power supply of some important loads, and reduce the personal safety threat and economic property loss caused by power failure. When a fault occurs within the distribution network or the upper-level power grid, active decoupling can be achieved by adjusting the opening and closing states of the section switch and tie switch, forming a power island powered by distributed generation (Distribution Generation, DG). Under the premise of energy supply security, the recovery speed of power supply for important loads in the system is improved. For the distribution network with distributed power generation, by setting the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/381H02J3/388H02J2203/20H02J2203/10Y04S20/222
Inventor 陈厚合姜涛李雪张儒峰丛前李国庆王长江李本新张嵩
Owner NORTHEAST DIANLI UNIVERSITY
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