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Multi-direct-current sending-end power grid planning scheme adaptability evaluation method and system

A technology for power grid planning and adaptability evaluation, applied in information technology support systems, data processing applications, instruments, etc., can solve the problems of increased structural complexity and vulnerability of AC-DC hybrid power grids

Active Publication Date: 2021-07-30
STATE GRID SICHUAN ECONOMIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the gradual expansion of the scale of UHV DC transmission, the grid structure, operation form and stability characteristics of the multi-DC transmission grid have undergone profound changes. The flexibility is increasing, and the adaptability of the grid is facing new challenges

Method used

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  • Multi-direct-current sending-end power grid planning scheme adaptability evaluation method and system
  • Multi-direct-current sending-end power grid planning scheme adaptability evaluation method and system
  • Multi-direct-current sending-end power grid planning scheme adaptability evaluation method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Example 1: Adaptability assessment method for multi-DC transmission power grid planning schemes, such as figure 1 shown, including the following steps:

[0071] S1: Construct the adaptability evaluation parameter model of multi-DC sending-end power grid;

[0072] S2: Obtain the basic network information of the target planning scheme, and calculate the first parameter among the system strength adaptability parameters according to the basic network information;

[0073] S3: Select the operation mode information in the target planning scheme to perform power flow calculation to obtain the second parameter among the economic development adaptability parameters, energy structure adaptability parameters and system strength adaptability parameters;

[0074] S4: Carry out stability simulation on the target planning scheme according to the operation failure situation, and obtain the safety and stability adaptability parameters;

[0075] S5: Through the adaptive evaluation para...

Embodiment 2

[0114] Example 2: Adaptability assessment system for planning schemes of multi-DC sending end power grids, such as figure 2 As shown, it includes model construction module, network information calculation module, power flow calculation module, simulation module and evaluation module. The model construction module is used to construct the adaptability evaluation parameter model of the multi-DC transmission power grid; the network information calculation module is used to obtain the basic network information of the target planning scheme, and calculate the first parameter in the system strength adaptability parameter according to the basic network information. One parameter; the power flow calculation module is used to select the operation mode information in the target planning scheme for power flow calculation to obtain the second parameter in the economic development adaptability parameter, the energy structure adaptability parameter and the system strength adaptability param...

Embodiment 3

[0115] Embodiment 3: as image 3 As shown, the two planning schemes A and B of the UHV AC network frame of a provincial power grid are the target planning schemes. Perform step S2 operation on the target planning scheme, and obtain some index results of system strength adaptability, as shown in Table 1.

[0116] Table 1

[0117] Equivalent inertia of the system under the operation modes of Fengda and Kuda

[0118] Unit: second

[0119]

[0120] Perform step S3 operation on the target planning scheme, and obtain some index results as shown in Table 2.

[0121] Table 2

[0122] power balance factor

[0123] Unit: 10,000 VA, 10,000 kW

[0124] Operation mode Variable capacity Provincial load Outgoing power power balance factor Reference Big way 34082 6650 6634.3 2.57 ＞1.1 dry way 32010 6439.4 2880 3.43 ＞1.2

[0125] System loss

[0126] Unit: 10,000 kW, 10,000 VA

[0127]

[0128] Multiple DC output short circuit ratio

...

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Abstract

The invention discloses a multi-direct-current sending-end power grid planning scheme adaptability evaluation method and system, and relates to the technical field of power system safety, and the technical scheme is characterized in that: the method comprises the steps of: calculating a first parameter in system strength adaptability parameters according to network basic information; selecting operation mode information to carry out load flow calculation to obtain a second parameter in an economic development adaptability parameter, an energy structure adaptability parameter and a system strength adaptability parameter; performing stability simulation on the target planning scheme according to the operation fault condition to obtain a safe and stable adaptability parameter; and comprehensively evaluating the economic development adaptability parameter, the energy structure adaptability parameter, the system strength adaptability parameter and the safety and stability adaptability parameter to obtain an adaptability evaluation result. According to the method, multiple influence factors are considered, comprehensive evaluation is carried out from the aspect of overall adaptability of the grid, and the adaptability of a sending-end power grid to supporting large-scale direct current delivery can be effectively reflected.

Description

technical field [0001] The present invention relates to the technical field of electric power system safety, and more specifically, it relates to a method and a system for evaluating the adaptability of planning schemes of power grids at multiple direct current sending ends. Background technique [0002] Due to the reverse distribution of energy resources and power demand in my country, the west-to-east power transmission has become a strategic measure to realize the optimal allocation of energy resources. In order to meet the urgent needs of long-distance, large-capacity, and cross-regional transmission of hydropower resources in the western region, the construction of multi-circuit UHV large-capacity DC transmission channels has become a key way to solve the problem. With the gradual expansion of the scale of UHV DC transmission, the grid structure, operation form and stability characteristics of the multi-DC transmission grid have undergone profound changes. The flexibil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q10/04G06Q50/06
CPCG06Q10/06393G06Q10/04G06Q50/06Y04S10/50
Inventor 杜新伟袁川李博乔云池唐权胥威汀李婷王云玲苟竞文云峰
Owner STATE GRID SICHUAN ECONOMIC RES INST
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