Power system power flow optimization method considering double-circuit IPFC control characteristics

A technology of control characteristics and optimization methods, which is applied in the direction of power transmission AC network, AC network with the same frequency from different sources, electrical components, etc., can solve problems such as improper control decision-making, threat to system security, line flow limit, etc., to achieve Comprehensive effect of quality assurance and optimization model

Pending Publication Date: 2022-04-22
SOUTHEAST UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Inconsistency between model assumptions and actual operations inevitably introduces errors, leading to inappropriate control decisions
In some cases, this kind of control decision may even threaten the system security, such as the flow limit of the line

Method used

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  • Power system power flow optimization method considering double-circuit IPFC control characteristics
  • Power system power flow optimization method considering double-circuit IPFC control characteristics
  • Power system power flow optimization method considering double-circuit IPFC control characteristics

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Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment adopts a power system power flow optimization method that takes into account the IPFC control characteristics of double-circuit lines according to the present invention. The optimization method includes two parts: objective function and constraint conditions.

[0049] (1) Objective function

[0050] For taking into account the safety and economy of the system, the method of the present invention sets up the objective function as follows:

[0051] f=λ 1 f 1 +λ 2 f 2 (1)

[0052] where f 1 is the security objective function, f 2 is the economic objective function. lambda 1 , lambda 2 are the weight coefficients corresponding to the security objective function and the economical objective function, respectively.

[0053] In order to make the optimization strategy meet the N-1 safety constraints of the power flow, the present invention introduces the sum of the load rates of the heavy-duty lines when N-1 faults occur to describe the safety object...

Embodiment 2

[0096] This embodiment adopts a solution method of the power system power flow optimization model considering the IPFC control characteristics of the double circuit according to the present invention.

[0097] Due to the nonlinearity of the power flow optimization model of the power system considering the control characteristics of the double-circuit IPFC, the present invention designs a calculation structure based on the particle swarm algorithm and realizes the solution of the model. In this calculation structure, the penalty function is used to deal with the inequality constraints (8), (11), and the power flow calculation guarantees the equality constraints (7), (9).

[0098] In the computing structure based on particle swarm algorithm designed by the present invention, suppose particle is a multidimensional vector x, x=[P g1 ,...,P gNg ,Q g1 ,...,Q gNg ,V g1 ,...,V gNpv ,P 1ref ,Q 1ref ,P 2ref ,Q 2ref ,V iref ]. Among them, N pv It is the number of PV nodes par...

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Abstract

The invention discloses a power system power flow optimization method considering double-circuit IPFC control characteristics, the power flow optimization method comprises an optimization model and a solving method of the optimization model, and constraint conditions of the optimization model comprise IPFC operation constraint, system operation constraint and equality constraint and inequality constraint of the double-circuit IPFC control characteristics. The objective function of the optimization model considers the economical efficiency and the static safety of the power grid at the same time, the constraint condition also considers the related constraint of the control characteristics of the double-circuit IPFC besides the conventional operation constraint, and the optimization model is relatively comprehensive and rigorous; the considered control characteristic of the IPFC is different from that in the existing research, the injection voltage of the IPFC before and after the fault is kept unchanged, but the power flow of the power transmission section where the IPFC is located before and after the fault is kept unchanged as much as possible; the considered control characteristics of the IPFC are more suitable for engineering practice, and the control characteristics of the IPFC are accurately considered.

Description

technical field [0001] The invention relates to the technical field of power system stability and control, in particular to a power flow optimization method for a power system taking into account the IPFC control characteristics of double-circuit lines. Background technique [0002] The interline power flow controller (IPFC) is a typical representative of the third-generation FACTS devices. IPFC is connected in series with multiple lines, which can solve a series of transmission problems such as the scarcity of transmission corridors in load-intensive receiving-end grids and the limited transmission capacity of sections caused by uneven distribution of power flows. Compared with the traditional single-circuit IPFC, the double-circuit IPFC has significantly improved fault tolerance. When an N-1 fault occurs on the series line where the traditional single-circuit IPFC is located, the series converter on the faulty line is likely to lose control of the faulty line, thereby thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/36H02J3/46
CPCH02J3/06H02J3/36H02J3/466H02J2203/10H02J2203/20H02J2300/40Y02E60/60
Inventor 吴熙陆瑶王瑞刘奕晨
Owner SOUTHEAST UNIV
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