CN108923459A - A kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch - Google Patents
A kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch Download PDFInfo
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- 230000002068 genetic effect Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
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Classifications
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- H02J3/382—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention relates to a kind of alternating current-direct current power distribution network optimal control methods, more particularly to a kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch.The present invention replaces the interconnection switch in alternating current-direct current power distribution network using intelligent Sofe Switch, Optimized model is established according to distribution net work structure, solving system runs optimum point, to realize system losses minimum, the smallest control target of node voltage deviation under the premise of guaranteeing power grid operation.Pass through simulating, verifying effectiveness of the invention, simulation result shows that system loss can be effectively reduced in a kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch, improve the out-of-limit situation of node voltage, can cooperate in real time improves operation of power networks state, meets the requirement of active distribution network economical operation, Green Development.
Description
Technical field
The present invention relates to a kind of alternating current-direct current power distribution network optimal control method, more particularly to a kind of based on intelligent Sofe Switch
Alternating current-direct current power distribution network optimal control method.
Background technique
The development of new energy technology, the access of a large amount of distributed generation resources are so that the reduction of conventional electrical distribution net operational efficiency, system
Increased costs, operational reliability decline.It is control with power distribution network economy, stable operation under the background of third time energy revolution
Target, the active distribution network with automatic adjusument source-net-lotus layer come into existence as the situation requires.Reinforce conventional AC using DC techniques
Power distribution network, building alternating current-direct current active distribution network is one of important behaviour form of the following active distribution network, can be distributed improving
Formula power supply digestion capability, flexible control system trend while reducing system operation cost, the optimization power distribution network method of operation, but
It is relative complex in grid structure and coordinated control mode.
The distributed electrical source device power output of high permeability has uncertainty, produces bad shadow to the safe operation of power grid
It rings.Conventional electrical distribution net realizes that the premise of stable operation is the operating status of continuous regulation interconnection switch.However in actual operation,
There is the problems such as movement loss, Alloy White Iron in interconnection switch, bring hidden danger, and the inadaptable following intelligence for the safe operation of power grid
The requirement of power grid flexible load disturbance.Intelligent Sofe Switch is the power electronic devices for replacing connection switch in traditional circuit, can be with
Flexible control institute connection line, reduces system loss, brings many benefits for power network safety operation.
Currently, domestic and foreign scholars have obtained a series of achievements in the research of alternating current-direct current distribution network control method, such as
There is method [1], sees that Automation of Electric Systems, the trend for the multiterminal interconnection alternating current-direct current power distribution network that the 14th phase of volume 40 publishes are layered control
System strategy and algorithm, propose a kind of muti-layer control tactics, simulation result shows that the control strategy is effectively improved alternating current-direct current distribution
The trend of system fluctuates, while the hybrid algorithm mentioned also has preferable constringency performance, has method [2], sees Chinese motor
Engineering journal, the alternating current-direct current mixing medium voltage distribution network power vs. voltage coordinated control based on VSC that the 22nd phase of volume 36 publishes are
Consumption distributed generation resource proposes a kind of power vs. voltage control method for coordinating, by sample calculation analysis demonstrates mentioned algorithm
Validity.Intelligent Sofe Switch is applied to alternating current-direct current mixing power distribution network by the present invention, proposes that a kind of friendship based on intelligent Sofe Switch is straight
Power distribution network optimal control method is flowed, it is different from other situations.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of, and the alternating current-direct current power distribution network based on intelligent Sofe Switch optimizes control
Method processed improves voltage out-of-limit situation as objective function and establishes Optimized model, be effectively improved distribution to reduce via net loss
Power network fluctuation situation when plant-grid connection, improves distribution Power System Reliability.
In order to achieve the above-mentioned object of the invention, technical solution proposed by the present invention is to replace alternating current-direct current to match using intelligent Sofe Switch
Power grid interconnection switch establishes Optimized model according to alternating current-direct current distribution net work structure, solves operation optimum point, is guaranteeing system to realize
The control target of loss minimization under the premise of stable operation.It is characterized in that according to selected alternating current-direct current distribution system, input line
Road parameter determines the on-position of intelligence Sofe Switch, establishes Optimal Operation Model according to constructed alternating current-direct current power distribution network, uses
Improved adaptive GA-IAGA solves operation optimum point, to realize distribution system optimization operation.
Wherein, a kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch, Optimal Operation Model
Middle objective function is to reduce via net loss, improve voltage out-of-limit situation, and control variable is the active output of distributed generation resource, intelligence
The active output of Sofe Switch and idle output, the active output and idle output of converter station, constraint condition are AC and DC route branch
The constraint of road power bi-directional, inverter operation constraint, intelligent Sofe Switch operation constraint, node voltage constraint, system load flow constraint.
A kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch, to reduce via net loss, change
Kind voltage out-of-limit situation establishes optimization mathematic(al) representation as objective function：
In formula, C1、C2It indicates weight coefficient, takes C1=C2=0.5.PAClossIndicate alternating current circuit loss, PDClossIndicate straight
Flow Line loss, PVSClossIndicate inverter loss, UiIndicate the voltage value of node i, UNIndicate voltage rating.
A kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch, the constraint of system stable operation
Condition is：
In formula, SDCmn、SDCnmIndicate the forward and reverse apparent energy of direct current branch m-n, SDCmaxIndicate that direct current branch power holds
Measure the upper limit；
In formula, SACmn、SACnmIndicate the forward and reverse apparent energy of exchange branch m-n, SDCmaxIndicate that exchange branch power holds
Measure the upper limit；
In formula, PVSC、QVSCRespectively indicate the active power for flowing through inverter, reactive power, SVSCmaxIndicate inverter capacity
The upper limit；
In formula, PSOP1、PSOP2Indicate the active power of two VSC, QSOP1、QSOP2Indicate the reactive power of two VSC,
SSOP1、SSOP2Indicate the working capacity of two VSC；
In formula, Pi、QiIndicate injection active power, the reactive power of node i, Gij、BijThe reality of expression system admittance matrix
Portion, imaginary part, θijIndicate the phase angle difference between node i, j.
A kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch, seeks the Optimized model of foundation
Solution belongs to nonlinear optimal problem, is solved using improved adaptive GA-IAGA, and improved adaptive GA-IAGA is calculated by improving conventional genetic
Genetic operator parameter in method makes algorithm the convergence speed faster, is not easy to be trapped in local solution.
Compared with prior art, the invention has the advantages that：The present invention is straight for the friendship based on intelligent Sofe Switch
Power distribution network is flowed, proposes a kind of optimal control method, by simulating, verifying effectiveness of the invention, simulation result shows one kind
System loss can be effectively reduced in alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch, and it is out-of-limit to improve node voltage
Situation, can real-time regulating system fluctuation improve operation of power networks state, meet active distribution network economical operation, Green Development is wanted
It asks.
Detailed description of the invention
Fig. 1 is the alternating current-direct current distribution net work structure figure of the invention based on intelligent Sofe Switch；
Fig. 2 is that improved adaptive GA-IAGA of the invention solves flow chart；
Fig. 3 is the out-of-limit situation simulation comparison figure of node voltage before and after optimization of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
Fig. 1 is the alternating current-direct current distribution net work structure figure of the invention based on intelligent Sofe Switch, and wherein route 1 is alternating current circuit,
Route 2 is DC line, and every route accesses photovoltaic devices PV and load Load, main converter station VSC are placed on 10kV exchange
The exit of bus is responsible for alternating current circuit being converted to DC line, using monopole symmetrical structure, it is contemplated that system loss and ring
The influence factors such as border, DC voltage use the peak value of alternating voltage, i.e. 15kV；From converter station VSC for connecting cross, straight streamline
Road；Intelligent Sofe Switch replaces the interconnection switch in route 1, and the present invention passes through coordinated control intelligence Sofe Switch and converter station VSC, with
Realize that trend is controllable between feeder line, to optimize the system operation.
Fig. 2 is that improved adaptive GA-IAGA of the invention solves flow chart, and control variable includes intelligent Sofe Switch in solution procedure
Active power and reactive power, the active power and reactive power of inverter VSC output of transmission, photovoltaic devices issue active
Power, improved adaptive GA-IAGA are encoded and are initialized to these variables first, bring the variable after coding into Load flow calculation side
Journey solves individual fitness；Then convergence solution is acquired by selection, intersection, variation, this step improved adaptive GA-IAGA is lost than tradition
Faster, the convergence solution acquired brings its fitness of Load flow calculation equation solution into propagation algorithm convergence rate again；To individual goal letter
Numerical value is ranked up, and carries out next round optimization after excellent individual is replaced bad individual, until obtaining optimal solution or reaching repeatedly
For maximum number of times, the method is during solving optimization problem, it is possible to prevente effectively from falling into part while improving convergence rate
It is optimal.
Fig. 3 is the out-of-limit situation simulation comparison figure of node voltage before and after optimization of the invention, and setting node voltage normally allows
Range is [0.95,1.05], the node voltage out-of-limit when node voltage is in higher than 1.07 or is lower than 0.93, and system operation is unstable
It is fixed, since distributed generation resource power output has randomness and mutability, the present invention is verified by the emulation of 12s for distributed electrical
The voltage control capability of source power output cataclysm, chooses 2s as start time, system stable operation at this time, in 5s, 7s, 9s, 11s
Distributed generation resource power output mutation, is not optimised power distribution network, and due to lacking flexible regulating measure, obvious out-of-limit situation occurs in voltage；
Alternating current-direct current power distribution network after optimization, by coordinated control inverter VSC and intelligent Sofe Switch, quick regulating system power, in turn
Improve the out-of-limit situation of node voltage, guarantees that system stable operation, simulation result show that the present invention is a kind of based on intelligent Sofe Switch
System loss can be effectively reduced in alternating current-direct current power distribution network optimal control method, improves the out-of-limit situation of node voltage, demonstrates this hair
Bright correctness.
Claims (5)
1. a kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch, it is characterised in that according to selected alternating current-direct current
Distribution system, incoming line parameter determine the on-position of intelligence Sofe Switch, are established according to constructed alternating current-direct current power distribution network excellent
Change scheduling model, operation optimum point is solved using improved adaptive GA-IAGA, to realize distribution system optimization operation.
2. a kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch, Optimized Operation mould according to right 1
Objective function is to reduce via net loss, improve voltage out-of-limit situation in type, and control variable is the active output of distributed generation resource, intelligence
The active output of energy Sofe Switch and idle output, the active output and idle output of converter station, constraint condition are AC and DC route
The two-way constraint of branch power, inverter operation constraint, intelligent Sofe Switch operation constraint, node voltage constraint, system load flow constraint.
3. a kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch according to right 2, to reduce network
Loss improves voltage out-of-limit situation as objective function, establishes optimization mathematic(al) representation：
Wherein, C1、C2It indicates weight coefficient, takes C1=C2=0.5.PAClossIndicate alternating current circuit loss, PDClossIndicate AC line
Path loss consumption, PVSClossIndicate inverter loss, UiIndicate the voltage value of node i, UNIndicate voltage rating.
4. a kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch according to right 2, system stablizes fortune
Capable constraint condition is：
In formula, SDCmn、SDCnmIndicate the forward and reverse apparent energy of direct current branch m-n, SDCmaxIt indicates on direct current branch power capacity
Limit；
In formula, SACmn、SACnmIndicate the forward and reverse apparent energy of exchange branch m-n, SDCmaxIt indicates on exchange branch power capacity
Limit；
In formula, PVSC、QVSCRespectively indicate the active power for flowing through inverter, reactive power, SVSCmaxIt indicates on inverter capacity
Limit；
In formula, PSOP1、PSOP2Indicate the active power of two inverter VSC, QSOP1、QSOP2Indicate that two inverter VSC's is idle
Power, SSOP1、SSOP2Indicate the working capacity of two inverter VSC；
In formula, Pi、QiIndicate injection active power, the reactive power of node i, Gij、BijThe real part of expression system admittance matrix, void
Portion, θijIndicate the phase angle difference between node i, j.
5. a kind of alternating current-direct current power distribution network optimal control method based on intelligent Sofe Switch, the optimization of foundation according to right 1
Model solution belongs to nonlinear optimal problem, is solved using improved adaptive GA-IAGA, and improved adaptive GA-IAGA is by improving tradition
Genetic Operators parameter makes algorithm the convergence speed faster, is not easy to be trapped in local solution.
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Cited By (4)
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| CN109713670A (en) * | 2019-01-28 | 2019-05-03 | 合肥工业大学 | Fault recovery based on three port flexibility multimodes switch controls optimization method |
| CN111969662A (en) * | 2020-08-20 | 2020-11-20 | 天津大学 | Data-driven multi-intelligent soft switch partition cooperative adaptive voltage control method |
| CN114759616A (en) * | 2022-06-14 | 2022-07-15 | 之江实验室 | Micro-grid robust optimization scheduling method considering characteristics of power electronic devices |
| CN116505778A (en) * | 2023-04-24 | 2023-07-28 | 国网山东省电力公司济宁供电公司 | Intelligent soft switching power self-adaptive regulation and control method based on node voltage difference |
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| CN116505778B (en) * | 2023-04-24 | 2023-12-08 | 国网山东省电力公司济宁供电公司 | Intelligent soft switching power self-adaptive regulation and control method based on node voltage difference |
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