Power System Unit Combination Model and Its Establishment Method for Two Types of State Variables

A unit combination and state variable technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as increasing the complexity of the UC model and increasing the computational complexity.

Active Publication Date: 2018-11-13
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are redundant constraints in the existing unit climbing constraints, which increases the complexity of calculations
The existing start-up cost constraints are planned using two sets of constraints, which increases the complexity of the UC model

Method used

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  • Power System Unit Combination Model and Its Establishment Method for Two Types of State Variables
  • Power System Unit Combination Model and Its Establishment Method for Two Types of State Variables
  • Power System Unit Combination Model and Its Establishment Method for Two Types of State Variables

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Embodiment Construction

[0064] The technical solution of the present invention will be described in further non-limiting detail below in conjunction with the embodiments and accompanying drawings.

[0065] Performance tests were performed with a series of 24-period examples of power system unit combinations ranging from 10 to 200 units.

[0066] One, if figure 1 As shown, the method for establishing the power system unit combination model of the second type of state variable in this embodiment includes the following steps:

[0067] (1) Collect the basic data of the unit combination of the power system;

[0068] The unit combination basic data includes the operating characteristic data, load forecast data and spinning reserve data of each time period of the generator set;

[0069] The operating characteristic data of the generating set includes the fuel cost of the generating set, the start-up cost, the cold start time, the minimum start-stop time, the upper bound / lower bound of the ramp rate of the...

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Abstract

The invention discloses a quadratic state variable electric power system unit commitment model and the method for establishing the same. The method comprises the following steps: collecting the basic data for the electric power system unit commitment; building respectively a unit rotation reserve constraint, a unit initial state constraint, a unit state constraint and a minimum start and stop time constraint; constructing the projected unit output continuous variable and establishing a unit output constraint; creating a unit power equalizing constraint; conducting projection transform to the parameters of the climbing limit of the unit and creating a climbing rate constraint; establishing a unit start cost constraint; establishing a target expression of the unit commitment model; determining whether the number of the unit commitments is more than 60 or not; if the number exceeds 60, carrying out the linear approximation of the quadratic objective function of the mathematical unit commitment model; otherwise, directly calling the mixed integer programming solver for the unit commitment model and then outputting an optimized scheme for the unit commitment. The unit commitment model of the present invention has fewer nonzero elements and is more compact, and the computational efficiency is higher when the solver is used.

Description

technical field [0001] The invention relates to power system dispatching, in particular, it provides a power system unit combination model of two types of state variables and a method for establishing the same. Background technique [0002] With the increase of the scale of the power system and the increasing energy crisis, people have higher and higher requirements for the economical operation of the power system. The unit combination optimization of the power system has an important impact on the economic operation and safe dispatch of the power system. It can not only save a lot of economic costs, but also improve the reliability of the power system through a certain spinning reserve. The unit combination optimization problem involves two sub-problems, one is the unit combination, which is used to determine which units are output; the other is economic load distribution, which is used to determine how much power these units need to produce. The decision variables of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 杨林峰张晨简金宝张婷婷
Owner GUANGXI UNIV
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