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Safety constraint unit combination rapid calculation method and system based on model dimension reduction

A technology of safety constraints and unit combination, applied in computing, single-network parallel feeding arrangement, AC network with the same frequency from different sources, etc., can solve the huge, complex and difficult problems of SCUC

Pending Publication Date: 2019-12-10
CHINA SOUTHERN POWER GRID COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the rapid development of the modern power system, the scale of the power grid has been further expanded, the number of units considered for power generation dispatch has been increasing, and the limitation of transmission channels for power grid operation has become increasingly significant, making the SCUC problem extremely large and complex.
The safe and economical operation of the extra-large power grid puts forward new requirements for the dispatching control business. The large number of discrete variables for starting and stopping of units, as well as the operating constraints of the power grid and units, bring challenges to the solution of the safety-constrained unit combination problem. The traditional standardized construction It is difficult to obtain the optimal solution of the SCUC problem in a limited time due to the direct solution method of the module

Method used

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  • Safety constraint unit combination rapid calculation method and system based on model dimension reduction
  • Safety constraint unit combination rapid calculation method and system based on model dimension reduction
  • Safety constraint unit combination rapid calculation method and system based on model dimension reduction

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Embodiment 1

[0098] In the process of power grid generation plan preparation, it is necessary to adopt the safety constraint unit combination technology to optimize the unit combination scheme every 15 minutes on the next day. The optimization process not only requires careful consideration of various safety constraints in power grid operation, such as unit operation constraints, power grid security constraints, and load balance constraints, but also requires that the calculation process can be completed within a time acceptable to the operator, so that the calculation accuracy and calculation time Meet the actual requirements of the project.

[0099] The present invention proposes a fast calculation method for safety-constrained unit combination based on model dimensionality reduction, which preprocesses the large-scale safety-constrained unit combination model, fully considers the characteristics of the unit combination model and the structural characteristics of the power system, and ide...

Embodiment 2

[0145] Correspondingly, the present invention also provides a fast calculation system for safety-constrained unit combinations based on model dimension reduction, which is characterized in that it includes a data acquisition module, a dispatch relaxation model calculation module, a unit division module, a power transmission section division module, and a combined dimension reduction module. Module building module and combined dimension reduction model calculation module;

[0146] The data acquisition module is used to acquire the data required for the calculation of the safety-constrained unit combination;

[0147] The dispatch relaxation model calculation module is used to calculate the active power output results of each unit and the power flow results of each transmission section according to the preset security constraint economic dispatch relaxation model;

[0148] The unit division module is used to divide the generator set into a must-start and stop-stop unit and a buff...

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Abstract

The invention discloses a safety constraint unit combination rapid calculation method and system based on model dimension reduction. The method comprises the steps as follows: performing calculation to obtain an active power output result of each unit and a power flow result of each power transmission section according to a preset safety constraint economic dispatching relaxation model; dividing generator units into must start and stop units and buffer units according to the active power output result of each generator unit; dividing the power transmission sections into valid sections and invalid sections according to the power flow result of each power transmission section; obtaining a safety constraint unit combination dimension reduction model by taking the start-stop state of the buffer units as a combination decision variable and considering the limit value constraint of the valid power transmission sections; and performing calculation to obtain a unit combination result accordingto the safety constraint unit combination dimension reduction model. By identifying invalid shaping variables and network constraints, the feasible region is reduced, and the calculation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of safety-constrained unit combination calculation, in particular to a fast calculation method and system for long-period safety-constrained unit combination of a large power grid based on model dimension reduction. Background technique [0002] The security constrained unit commitment (SCUC) is to optimize the unit power generation plan according to the system load forecast in each period of the research period, including the unit start-stop mode and power generation output. The goal of optimization is to minimize the total cost of the system under certain constraints. The constraints that can be considered generally include system power balance constraints, unit operation constraints, and section power flow constraints. SCUC is the core link of the grid power generation plan, and also the basis of the economic dispatch and safety check of the power system, and plays an extremely important role in the optim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/06H02J3/48G06F17/50
CPCH02J3/00H02J3/06H02J3/48
Inventor 苏寅生刘春晓李一铭李智勇涂孟夫李利利
Owner CHINA SOUTHERN POWER GRID COMPANY
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