A Reactive Power Optimization Method of Power System Considering Cost Factor
A power system and cost factor technology, applied in the power field, can solve problems such as reactive power compensation equipment, etc., and achieve the effect of strong practicability, simple implementation and low cost
Active Publication Date: 2018-04-06
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0004] The reactive power optimization model of the existing technology has the following problems: the main consideration is the technical problem, that is, how to timely adjust the reactive power compensation equipment of the substation and the tap of the main transformer, how to optimize the distribution of reactive power flow in the power grid, and how to improve the power flow of the power grid. Voltage level, or how to configure reactive power compensation equipment from the perspective of improving voltage quality and reducing network loss, etc., without considering how to reasonably configure reactive power compensation equipment under the premise of the lowest cost
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[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0041] Please refer to figure 1 , optimize the IEEE 14-node system with the method described in the present invention, the capacity reference value of the IEEE 14-node system is 100MVA, and the voltage reference value is 23kV.
[0042] Such as figure 1 As shown, the IEEE 14-node system includes 5 generators (nodes 1, 2, 3, 6, and 8, of which 1 is a balance node and the rest are PV nodes) and 3 adjustable transformers. The main parameters are shown in the following table:
[0043] Table 1 Basic data of IEEE 14-node system
[0044] serial number
Number of nodes
Number of branches
Adjustable number of transformers
Number of generators
1
14
20
...
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The invention discloses an electric power system reactive power optimization method considering a cost factor. The electric power system reactive power optimization method comprises the steps of dividing nodes of a system into PV nodes, PQ nodes and balancing nodes, establishing an expression of active power loss of a system, an expression of a node voltage value set offset range and an expression of total cost of required reactive-load compensation equipment and using the expressions as three optimized target functions; using an active power balance equation and a reactive power balance equation as two optimized equality constraints; utilizing reactive power supply output reactive power top and bottom limitations, voltage amplitude value top and bottom limitations and transformer transformation ratio expressing top and bottom limitations which serve as inequality constraints to establish an optimization model and optimizing system parameters. The electric power system reactive power optimization method has the advantages that on the premise that all specific constraint conditions are met, the cost of the reactive-load compensation equipment of the system is lowest, the reactive-load compensation equipment can be reasonably configured on the premise that the cost is lowest, and accordingly the method is very beneficial to actual operation of the power system and guidance and reference of engineering.
Description
technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a reactive power optimization method of a power system considering cost factors. Background technique [0002] The analysis of power system reactive power optimization is of great significance to the actual operation of power system. The reactive power optimization problem of the power system is that when the structural parameters and load conditions of the system are given, through the optimization of some control variables, it can be found that one or more of the system can be satisfied under the premise of satisfying all specified constraints. The reactive power adjustment method when the performance index reaches the optimum. The reactive power optimization problem is a multi-objective, multi-constraint, uncertain nonlinear mixed programming problem, which involves the selection of reactive power compensation sites, the determination of reactive power comp...
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IPC IPC(8): H02J3/18
CPCH02J3/18H02J2203/20Y02E10/56Y02E40/30
Inventor 刘鹏李海吕志来张学深
Owner STATE GRID CORP OF CHINA