Unlock instant, AI-driven research and patent intelligence for your innovation.

A static equivalence method for dual-port black box external network based on improved branch breaking analog DC method

A static equivalent, dual-port technology, applied in the value field, can solve problems such as large calculation errors and inability to respond to changes in the power of intranet tie lines, achieve small measurement errors, avoid initial value setting problems and calculation convergence problems, and be efficient The effect of solving

Active Publication Date: 2020-06-23
CHONGQING UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In my country's actual power system, when the information of the external network is completely unknown, the energy management system EMS of the dispatching department often treats the external network as a model of a simple hanging equivalent machine, which uses the equivalent value suspended at the boundary node for the adjacent grid Inject power instead, but it cannot reflect the power change on the tie line when the internal network is disturbed, so the calculation error is very large when the internal network line or generator simulates the breaking operation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A static equivalence method for dual-port black box external network based on improved branch breaking analog DC method
  • A static equivalence method for dual-port black box external network based on improved branch breaking analog DC method
  • A static equivalence method for dual-port black box external network based on improved branch breaking analog DC method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] see Figure 1 to Figure 3 , a dual-port black box external network static equivalent method based on the improved branch circuit breaking analog DC method, which mainly includes the following steps:

[0049] 1) Input the topology information of the intranet branch associated with the border node, the state information of the intranet branch associated with the border node, and the topology information of the disconnected branch. Furthermore, the topology information of the internal network branch associated with the border node mainly includes the border node number, the number of the internal network node directly connected to the border node, and the susceptance parameter of the branch associated with the border node. The status information of the internal network branch associated with the boundary node mainly includes the voltage phase angle of the boundary node before and after the disconnection of the internal network branch and the voltage phase angle of the inte...

Embodiment 2

[0077] An experiment of static equivalence of the external network using the dual-port black box external network static equivalent method based on the improved branch circuit breaking analog DC method, mainly includes the following steps:

[0078] 1) Use standard system data to simulate the internal and external network and use SCADA measurement to estimate the real-time state of the internal power grid

[0079] Such as Figure 4 As shown, in the IEEE39 node system, nodes 3 and 17 are used as boundary nodes, nodes 1, 2, 25-30, and 37-39 are external network nodes, and the remaining nodes are internal network nodes. The external network generators 30 and 37 , 38 are processed as PQ nodes, and branch l is disconnected at the same time 9-39 , forming the simulation system of the two-port interconnected grid and its ground state power flow state.

[0080]Simulation method of intranet power flow state: In the IEEE39 node system, the power flow result of the correction system is ...

Embodiment 3

[0087] An experiment of comparing equivalent impedance mainly includes the following schemes:

[0088] Scheme 1: Extended Ward equivalent method for the external network, that is, based on the ground state power flow, the extended Ward equivalent method is used to calculate the equivalent impedance of the external network. This value can be used as a reference value for the equivalent parameter of the external network.

[0089] Scheme 2: Estimation method of static equivalent parameters of the two-port external network based on the measured information of the internal network. Among them, the initial values ​​of the least squares estimation algorithm for equivalent resistance and reactance are respectively selected as [0, 0.5], [0, 1] and [0.5, 1], and at the same time it is assumed that the external network remains unchanged, and the active and reactive power of the internal network load The work is increased by 0.3% step size, and the unbalanced active and reactive power is ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a dual port black box external network static equivalent method based on an improved branch circuit breaking analog DC method. The method mainly comprises the following steps:1) inputting topology information of a boundary node associated intranet branch, status information of the boundary node associated intranet branch and topology information of breaking branch; 2) calculating the boundary node voltage phase angle increment (Delta Theta) B after branch breaking and the intranet node voltage phase angle increment (Delta Theta) S associated with the boundary node after the branch breaking; 3) determining the number h of boundary nodes in the nodes at both ends of the breaking branch; 4) calculating the sum b<12> of the equivalent susceptances between the two boundary nodes according to the number h of boundary nodes; 5) calculating the equivalent susceptance value b<12><eq> of the external network between the two boundary nodes; and 6) calculating the equivalent injection power of the external network at the boundary nodes. The method strictly establishes a linear relationship between the equivalent parameter and the voltage phase angle increment of the boundary associated node, thereby ensuring that the estimation of the equivalent parameter has sufficient accuracy.

Description

technical field [0001] The invention belongs to the field of power system scheduling automation, in particular to a dual-port black-box external network static equivalent method based on the improved branch circuit breaking analog direct current method. Background technique [0002] With the strengthening of power grid construction, the power system has gradually developed into a large-scale regional interconnected power grid. When analyzing and making decisions on the internal network, the influence of the interconnected part of the network on its system operating characteristics must be considered. However, in the electricity market environment, due to technical or industry confidentiality reasons, the grid companies can only share some basic information according to regulations, resulting in the grid topology and operating status information in each region cannot be shared with each other in real time, and it is difficult to meet the needs of the grid. Daily simulation an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 颜伟王茜黄德志张超
Owner CHONGQING UNIV