CN109066703A - A kind of distribution network voltage regulation method counted and source lotus is coordinated - Google Patents
A kind of distribution network voltage regulation method counted and source lotus is coordinated Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The distribution network voltage that a kind of meter and source lotus are coordinated regulates and controls method, calculates each node voltage in power distribution network, if each node voltage within the specified scope if directly export and terminate pressure regulation；Otherwise judge whether voltage gets over the upper limit, coordinate regulating and controlling voltage model using the source lotus containing photovoltaic, electric car, on-load regulator transformer if the voltage value in the moment is beyond assigned voltage upper limit value and carry out regulating and controlling voltage；Otherwise beyond lower limit value, then capacitor to be included in regulation measure, coordinate regulating and controlling voltage model using the source lotus containing photovoltaic, electric car, on-load regulator transformer and capacitor and carry out regulating and controlling voltage；Coordinate regulating and controlling voltage model optimal solution in the hope of the source lotus that solution obtains and carries out regulating and controlling voltage.It combines the interactive relationship of load side and source side, grid side, meter and its condition of uncertainty and Demand Side Response characteristic, solves the problems, such as to consider that grid-connected distribution network voltage generated under different meteorologic factors is out-of-limit.
Description
Technical field
The present invention relates to system for distribution network of power voltage control technology field, what specifically a kind of meter and source lotus were coordinated
Distribution network voltage regulates and controls method.
Background technique
In conventional electrical distribution net voltage, the uncertain factor for influencing voltage level is mostly load fluctuation, and is divided containing
In the distribution network voltage control of cloth power supply (DG), since the output power of distributed generation resource unit is natural by weather and region etc.
It influences, the uncertain factor in power distribution network increases.It meanwhile being voltage control to each busbar voltage in the distribution network voltage control containing DG
The object of system can generate power and send phenomenon, cause distribution network voltage excessively high if the DG capacity of access is excessive, it is excessive to layout,
Voltage control problem gradually complicates.Therefore, to avoid control DG generated energy, clean energy resource utilization rate, preferred voltage are improved
Control method be adjusted on the spot using the Reactive-power control ability of DG, and due to the variable topology of power distribution network increase rack with
The increase of the complexity and Demand Side Response problem of trend undoubtedly increases variable and dimension in control.Therefore, DG
Idle control can only improve the voltage level of power distribution network to a certain extent, be unable to reach that power distribution network reasonable voltage is horizontal to be wanted
It asks, needs more efficiently control mode.
For containing the grid-connected out-of-limit problem of distribution network voltage, some electricity for having researched and proposed grid-connected active reduction
Control strategy is pressed, but completes distribution network voltage control as cost to reduce renewable energy power generation amount, it is difficult to its benefit be effectively ensured
With rate and digestion capability, the considerations of also shortage to under-voltage situation.Realize pressure regulation then more by the idle control of photovoltaic DC-to-AC converter
Economical and effective.The idle control strategy of photovoltaic DC-to-AC converter for grid entry point voltage out-of-limit that some scholars propose Germany carries out
Analysis, and propose a kind of control strategy based on grid entry point voltage magnitude and photovoltaic active power output.Also proposition utilizes photovoltaic
The Reactive-power control ability of active reduction and inverter coordinates the voltage control method for realizing power distribution network in conjunction with traditional voltage adjusting device,
And sequence is adjusted to it and is made that rule compositor.Except existing extensive and distribution type renewable energy is grid-connected, electric car
(EV) the continuous access of electric facility and the development of energy storage and micro-capacitance sensor are changed in charge and discharge, will also result in different degrees of rush to power distribution network
It hits.On coping with this way to solve the problem, still solved at present with the normal grid of the follow load that generates electricity operation control theory,
And since the dynamic characteristic of power grid non-renewable energy is different, it need to be the realization energy and the efficient Optimum utilization of controllable burden resource comprehensive
It is furtherd investigate.Have in current research through the uncertainties model to " storage of source lotus ", establish containing renewable energy with
The analysis that the Stochastic Optimization Model of electric car carries out.There are also scholars to construct containing photovoltaic, plug-in hybrid electric vehicle and not
With the grid-connected distributed power supply system of load, illustrate that electric car networks (V2G) mode as standby in conjunction with German local data
Being adjusted with power supply and load peak has very big prospect.Above-mentioned document is mainly to the power distribution network containing electric car and distributed generation resource
Coordinated operation is studied, and is not specifically described for regulating and controlling voltage mode with resource coordination.
It is unfavorable for guaranteeing energy benefit in the distribution network voltage control mode containing photo-voltaic power supply, carrying out the active reduction of photovoltaic
With rate；Increase energy storage and reactive power compensator higher cost, in the environment of the access of a large amount of distributed generation resources, economy problems are needed
Further to consider；The method of pressure regulation is only carried out by its active output and inverter by the Reactive-power control ability of photovoltaic DC-to-AC converter
The limitation of capacity, shortcoming get over the pool of lower limit situation to voltage；Consider Demand Side Response distribution network voltage adjust cannot only into
Row load is cut down, and needs that the relationship that DG carries out economic benefit, quality of voltage improves between loss and cost is combined to be weighed
Weighing apparatus.
Therefore, the distribution network voltage control containing distributed generation resource is needed existing control mode and is continued to develop
The novel product of appearance combines, and consider load side and power grid interacts feature, needs to propose that one kind is more in line with and currently matches
The control method of operation of power networks.
Summary of the invention
In view of the deficiencies of the prior art, the distribution network voltage coordinated the invention proposes a kind of meter and source lotus regulates and controls method,
It combines the interactive relationship of load side and source side, grid side, meter and its Demand Side Response characteristic, is able to solve grid-connected production
The out-of-limit problem of raw distribution network voltage.
The present invention solves its technical problem and adopts the technical scheme that:
On the one hand, the distribution network voltage that a kind of meter provided in an embodiment of the present invention and source lotus are coordinated regulates and controls method, by sentencing
Power-off Force system at a time whether have voltage out-of-limit situation determine the voltage value in the moment be more the upper limit or more under
Limit, takes corresponding distribution network voltage regulating strategy to keep voltage stabilization with this.
It is described that corresponding distribution network voltage regulating strategy is taken to keep as a kind of possible implementation of the present embodiment
The process of voltage stabilization specifically: if it is assigned voltage upper limit value is exceeded, then the photovoltaic that regulation is participated in electric system is sent out
Electric grid-connected system, electric car and OLTC carry out regulation capacity and determine；If it is assigned voltage lower limit value is exceeded, then electricity is added
Container carries out controllable resources coordination, restores power system voltage with this, and keep voltage stabilization.
As a kind of possible implementation of the present embodiment, the assigned voltage upper limit value is (1+7%) * voltage rating.
As a kind of possible implementation of the present embodiment, the assigned voltage lower limit value is (1-7%) * voltage rating.
On the other hand, it is provided in an embodiment of the present invention it is a kind of meter and source lotus coordinate distribution network voltage regulation method include with
Lower specific steps:
Step 1: calculating each node voltage in power distribution network using Forward and backward substitution method, generate the initial launch shape of power distribution network
State；
Step 2: judging that each node voltage is whether in the prescribed limit of voltage desired value in power distribution network, if each node is electric
Pressure within the specified scope, then directly exports each node voltage value, pressure regulation terminates；If each node voltage is not within the specified scope,
Carry out step 3；
Step 3: judging whether voltage gets over the upper limit, utilized if the voltage value in the moment is beyond assigned voltage upper limit value
Source lotus containing photovoltaic, electric car, on-load regulator transformer coordinates regulating and controlling voltage model and carries out regulating and controlling voltage；It otherwise is the moment
Interior voltage value exceeds assigned voltage lower limit value, switchs to step 4；
Step 4: capacitor being included in regulation measure, using containing photovoltaic, electric car, on-load regulator transformer and capacitor
The source lotus of device coordinates regulating and controlling voltage model and carries out regulating and controlling voltage；
Step 5: coordinating regulating and controlling voltage model optimal solution in the hope of the source lotus that solution obtains and carry out meter and above-mentioned Regulation Control variable
Be pushed forward back substitution Load flow calculation, recalculate each node voltage；
Step 6: and each node voltage recalculated is judged whether in expected range, if voltage is in prescribed limit
It is interior, then each node voltage value is directly exported, pressure regulation terminates.
As a kind of possible implementation of the present embodiment, in conjunction with the negative rules and demand of load side electric car
The difference of grid-connected power output under side response characteristic, and different meteorologic factors, the source lotus of foundation coordinate regulating and controlling voltage mould
The objective function of type are as follows:
In formula, F is system regulation cost；N is photovoltaic power generation grid-connecting system access number of nodes in power distribution network；N is electronic vapour
Vehicle grid node number；ω1、ω2、ω3、ω4For weight coefficient, andK=4；λ is voltage out-of-limit penalty factor；f(Ui)
Penalty function is constrained for voltage:
In formula, UiFor node voltage each in system, Ui_min、Ui_maxRespectively node voltage upper lower limit value；Constraint condition are as follows:
(1) equality constraint, that is, node trend constraint:
Wherein, PPVi、QPViActive and reactive power output by accessing photovoltaic power generation grid-connecting system in node i；PLi_load、
QLi_loadPower is consumed for burden with power conventional in node i, load or burden without work；PEVi、QEViHad by connecing electric car in node i
Function, reactive power；Ui、UjIt is the voltage magnitude of node i Yu node j respectively；Gij、Bij、θijRespectively between node i and node j
Real part, imaginary part and the phase difference of voltage of admittance matrix；
(2) photovoltaic power generation grid-connecting System Reactive Power units limits:
QPVi_min≤QPVi,t≤QPVi_max
Wherein, QPVi_min、QPVi_maxRespectively photovoltaic Reactive-power control capacity upper and lower limit；
(3) electric car charge-discharge electric power constrains:
Wherein, PEVci,t、PEVdi,tThe respectively charge and discharge power of the controllable electric car of node i；PEVci_min、
PEVci_max、PEVdi_min、PEVdi_maxThe respectively controllable electric car charge and discharge maximum of node i, minimum active power；
(4) shunt capacitor switching capacity-constrained:
QC_min≤QC,t≤QC_max
Wherein, QC_min、QC_maxRespectively capacitor switching capacity upper and lower limit；
(5) on-load transformer tap changer gear voltage constrains:
UTapi_min≤UTapi,t≤UTapi_max
Wherein, UTapi_min、UTapi_maxRespectively have and carries load tap changer gear corresponding voltage upper and lower limit.
It is in step 3, described to utilize containing photovoltaic, electric car, have load as a kind of possible implementation of the present embodiment
The source lotus of adjustable transformer coordinate regulating and controlling voltage model carry out regulating and controlling voltage process the following steps are included:
Step 31: the control for coordinating regulating and controlling voltage model containing the source lotus of photovoltaic, electric car, on-load regulator transformer is become
Amount is expressed as:
X=[QPV1K QPVn,PEVc1K PEVcn,PEVd1K PEVdn,Tap1K Tapn,C1K Cn]
Wherein, QPViFor the reactive power of photovoltaic unit, PEVci、PEVdiFor electric car charge and discharge active power, TapiFor
On-load transformer tap changer gear；CiFor capacitor switching group number, and CiIt is 0；
Step 32: determining that the reactive power of each photovoltaic unit, electric car fill, put active power and on-load regulator transformer
After tap joint position variable, population environment is initialized；
Step 33: each node initial voltage iterative value being determined by Load flow calculation, and carries out the calculating of fitness function；
Step 34: updating particle position and speed；
Step 35: according to the particle position updated, carrying out the update of individual and global extremum；
Step 36: judging whether to meet algorithm termination condition, algorithm terminates and carry out step 37 if meeting, and otherwise returns
Return step 33；
Step 37: output optimal solution set and adaptive optimal control degree functional value, obtain certain moment in one day it is optimal photovoltaic it is idle
Value, the controllable capacity of electric car.
It is in step 4, described to utilize containing photovoltaic, electric car, have load as a kind of possible implementation of the present embodiment
The source lotus of adjustable transformer and capacitor coordinate regulating and controlling voltage model carry out regulating and controlling voltage process the following steps are included:
Step 41: the source lotus containing photovoltaic, electric car, on-load regulator transformer and capacitor is coordinated into regulating and controlling voltage mould
The control variable of type is expressed as:
X=[QPV1K QPVn,PEVc1K PEVcn,PEVd1K PEVdn,Tap1K Tapn,C1K Cn]
Wherein, QPViFor the reactive power of photovoltaic unit, PEVci、PEVdiFor electric car charge and discharge active power, TapiFor
On-load transformer tap changer gear；CiFor capacitor switching group number；
Step 42: determining that the reactive power of each photovoltaic unit, electric car fill, put active power and on-load regulator transformer
After tap joint position variable, population environment is initialized, and to CiCoding；
Step 43: carrying out sliding-model control, sliding-model control expression formula are as follows:
Xi=ROUND (Xi_temp)
Wherein, Xi_tempCoordinate the interim control variable of regulating and controlling voltage model for source lotus；
Step 44: each node initial voltage iterative value being determined by Load flow calculation, and carries out the calculating of fitness function；
Step 45: updating particle position and speed；
Step 46: according to the particle position updated, carrying out the update of individual and global extremum；
Step 47: judging whether to meet algorithm termination condition, algorithm terminates and carry out step 48 if meeting, and otherwise returns
Return step 44；
Step 48: output optimal solution set and adaptive optimal control degree functional value, obtain certain moment in one day it is optimal photovoltaic it is idle
Value, the controllable capacity of electric car.
As a kind of possible implementation of the present embodiment, the assigned voltage upper limit value is (1+7%) * voltage rating.
As a kind of possible implementation of the present embodiment, the assigned voltage lower limit value is (1-7%) * voltage rating.
What the technical solution of the embodiment of the present invention can have has the beneficial effect that:
On the one hand, the distribution network voltage that a kind of meter of technical solution of the embodiment of the present invention and source lotus are coordinated regulates and controls method,
Whether voltage out-of-limit situation is had by judging electric system at a time to determine that the voltage value in the moment is that more the upper limit is also
It is more lower limit, if it is assigned voltage upper limit value is exceeded, then to photovoltaic power generation grid-connecting system, the electricity for participating in regulation in electric system
Electrical automobile and OLTC carry out regulation capacity and determine；If it is assigned voltage lower limit value is exceeded, then capacitor is added and carries out controllably
Resource coordination restores power system voltage with this, and keeps voltage stabilization.Technical solution combination load side of the embodiment of the present invention with
The interactive relationship of source side, grid side, meter and its Demand Side Response characteristic, are able to solve the distribution network voltage of grid-connected generation
Out-of-limit problem.
On the other hand, the distribution network voltage that a kind of meter of technical solution of the embodiment of the present invention and source lotus are coordinated regulates and controls method,
The following steps are included: step 1: calculating each node voltage in power distribution network using Forward and backward substitution method, generate the initial fortune of power distribution network
Row state；Step 2: judging that each node voltage is whether in the prescribed limit of voltage desired value in power distribution network, if each node is electric
Pressure within the specified scope, then directly exports each node voltage value, pressure regulation terminates；If each node voltage is not within the specified scope,
Carry out step 3；Step 3: judge whether voltage gets over the upper limit, it is sharp if the voltage value in the moment is beyond assigned voltage upper limit value
Coordinate regulating and controlling voltage model with the source lotus containing photovoltaic, electric car, on-load regulator transformer and carries out regulating and controlling voltage；When being otherwise this
Voltage value in quarter exceeds assigned voltage lower limit value, switchs to step 4；Step 4: capacitor being included in regulation measure, using containing
Photovoltaic, electric car, on-load regulator transformer and capacitor source lotus coordinate regulating and controlling voltage model and carry out regulating and controlling voltage；Step 5:
What the source lotus obtained in the hope of solution coordinated that regulating and controlling voltage model optimal solution carries out meter and above-mentioned Regulation Control variable is pushed forward back substitution trend
It calculates, recalculates each node voltage；Step 6: and judge each node voltage for recalculating whether in expected range, if
Voltage within the specified scope, then directly exports each node voltage value, and pressure regulation terminates.Technical solution combination load of the embodiment of the present invention
The interactive relationship of side and source side, grid side, meter and its Demand Side Response characteristic, are able to solve the power distribution network of grid-connected generation
Voltage out-of-limit problem.The source lotus of technical solution of the embodiment of the present invention coordinates regulating and controlling voltage model and carries out regulating and controlling voltage process based on not
Photovoltaic with meteorologic factor contribute at random and the electric car uncertain load of demand response under the conditions of, establish with system
The regulating and controlling voltage model of the minimum target of regulation and control cost is calculated reasonable controllable resources by particle swarm algorithm and contributes.
Compared with prior art, technical solution of the embodiment of the present invention has the following advantages that and good effect:
(1) consider to carry out regulating and controlling voltage using the controllable burden characteristic of load side, in the Reactive-power control ability of photovoltaic unit
When reaching the upper limit, the power output that can avoid renewable energy is cut down, and guarantees the utilization rate of clean energy resource；
(2) when carrying out voltage control using controllable burden, the influence to user side, meter and its demand response are considered, excellent
To compensate electricity price as measurement standard during change, the response capacity as small as possible using controllable burden, and then realize voltage tune
It is whole, effectively reduce voltage fluctuation.
(3) the Reactive-power control ability and controllable burden characteristic, on-load voltage regulation for comprehensively utilizing source side photovoltaic DC-to-AC converter become
The pressure regulation ability of depressor and capacitor can effectively reduce the action frequency and its equipment of on-load regulator transformer and capacitor
Loss, can be improved its service life, while can avoid putting into operation for remaining reactive-load compensation equipment, reduce cost of investment, guarantee electricity
Fast quick-recovery is pressed, range of management is effectively increased, improves the economy of whole strategy.
Detailed description of the invention
Fig. 1 is the stream of the distribution network voltage regulation method of a kind of meter shown according to an exemplary embodiment and the coordination of source lotus
Cheng Tu；
Fig. 2 is photovoltaic power output variation schematic diagram under DIFFERENT METEOROLOGICAL CONDITIONS shown according to an exemplary embodiment；
Fig. 3 is electric automobile load curve synoptic diagram for 24 hours shown according to an exemplary embodiment；
Fig. 4 is to utilize the distribution network voltage regulation method of a kind of meter proposed by the present invention and the coordination of source lotus electric to the coordination of source lotus
Press the specific flow chart of regulation；
Fig. 5 is improved distribution net work structure figure applied by the present invention.
Specific embodiment
In order to clarify the technical characteristics of the invention, below by specific embodiment, and its attached drawing is combined, to this hair
It is bright to be described in detail.Following disclosure provides many different embodiments or example is used to realize different knots of the invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.
Embodiment 1
The distribution network voltage that a kind of meter provided in an embodiment of the present invention and source lotus are coordinated regulates and controls method, by judging power train
System at a time whether have voltage out-of-limit situation determine the voltage value in the moment be more the upper limit or more lower limit, adopted with this
Corresponding distribution network voltage regulating strategy is taken to keep voltage stabilization.
In one possible implementation, described that corresponding distribution network voltage regulating strategy is taken to keep voltage stabilization
Process specifically: if it is exceed assigned voltage upper limit value, then to participated in electric system regulation photovoltaic power generation grid-connecting system
System, electric car and OLTC carry out regulation capacity and determine；If it is assigned voltage lower limit value is exceeded, then capacitor progress is added
Controllable resources are coordinated, and restore power system voltage with this, and keep voltage stabilization.
In one possible implementation, the assigned voltage upper limit value is (1+7%) * voltage rating.
In one possible implementation, the assigned voltage lower limit value is (1-7%) * voltage rating.
The interactive relationship of combination of embodiment of the present invention load side and source side, grid side, meter and its Demand Side Response characteristic,
It is able to solve the out-of-limit problem of distribution network voltage of grid-connected generation.
Embodiment 2
Fig. 1 is the stream of the distribution network voltage regulation method of a kind of meter shown according to an exemplary embodiment and the coordination of source lotus
Cheng Tu；It is provided in an embodiment of the present invention it is a kind of meter and source lotus coordinate distribution network voltage regulation method comprising the following specific steps
Step 1: calculating each node voltage in power distribution network using Forward and backward substitution method, generate the initial launch shape of power distribution network
State；
Step 2: judging that each node voltage is whether in the prescribed limit of voltage desired value in power distribution network, if each node is electric
Pressure within the specified scope, then directly exports each node voltage value, pressure regulation terminates；If each node voltage is not within the specified scope,
Carry out step 3；
Step 3: judging whether voltage gets over the upper limit, utilized if the voltage value in the moment is beyond assigned voltage upper limit value
Source lotus containing photovoltaic, electric car, on-load regulator transformer coordinates regulating and controlling voltage model and carries out regulating and controlling voltage；It otherwise is the moment
Interior voltage value exceeds assigned voltage lower limit value, switchs to step 4；
Step 4: capacitor being included in regulation measure, using containing photovoltaic, electric car, on-load regulator transformer and capacitor
The source lotus of device coordinates regulating and controlling voltage model and carries out regulating and controlling voltage；
Step 5: coordinating regulating and controlling voltage model optimal solution in the hope of the source lotus that solution obtains and carry out meter and above-mentioned Regulation Control variable
Be pushed forward back substitution Load flow calculation, recalculate each node voltage；
Step 6: and each node voltage recalculated is judged whether in expected range, if voltage is in prescribed limit
It is interior, then each node voltage value is directly exported, pressure regulation terminates.
In one possible implementation, special in conjunction with the negative rules and Demand Side Response of load side electric car
Property, and under different meteorologic factor grid-connected power output difference, the source lotus of foundation coordinates the target of regulating and controlling voltage model
Function are as follows:
In formula, F is system regulation cost；N is photovoltaic power generation grid-connecting system access number of nodes in power distribution network；N is electronic vapour
Vehicle grid node number；ω1、ω2、ω3、ω4For weight coefficient, andK=4；λ is voltage out-of-limit penalty factor；f(Ui)
Penalty function is constrained for voltage:
In formula, UiFor node voltage each in system, Ui_min、Ui_maxRespectively node voltage upper lower limit value；Constraint condition are as follows:
(1) equality constraint, that is, node trend constraint:
Wherein, PPVi、QPViActive and reactive power output by accessing photovoltaic power generation grid-connecting system in node i；PLi_load、
QLi_loadPower is consumed for burden with power conventional in node i, load or burden without work；PEVi、QEViHad by connecing electric car in node i
Function, reactive power；Ui、UjIt is the voltage magnitude of node i Yu node j respectively；Gij、Bij、θijRespectively between node i and node j
Real part, imaginary part and the phase difference of voltage of admittance matrix；
(2) photovoltaic power generation grid-connecting System Reactive Power units limits:
QPVi_min≤QPVi,t≤QPVi_max
Wherein, QPVi_min、QPVi_maxRespectively photovoltaic Reactive-power control capacity upper and lower limit；
(3) electric car charge-discharge electric power constrains:
Wherein, PEVci,t、PEVdi,tThe respectively charge and discharge power of the controllable electric car of node i；PEVci_min、
PEVci_max、PEVdi_min、PEVdi_maxThe respectively controllable electric car charge and discharge maximum of node i, minimum active power；
(4) shunt capacitor switching capacity-constrained:
QC_min≤QC,t≤QC_max
Wherein, QC_min、QC_maxRespectively capacitor switching capacity upper and lower limit；
(5) on-load transformer tap changer gear voltage constrains:
UTapi_min≤UTapi,t≤UTapi_max
Wherein, UTapi_min、UTapi_maxRespectively have and carries load tap changer gear corresponding voltage upper and lower limit.
In one possible implementation, in step 3, described using containing photovoltaic, electric car, on-load voltage regulation transformation
The source lotus of device coordinate regulating and controlling voltage model carry out regulating and controlling voltage process the following steps are included:
Step 31: the control for coordinating regulating and controlling voltage model containing the source lotus of photovoltaic, electric car, on-load regulator transformer is become
Amount is expressed as:
X=[QPV1K QPVn,PEVc1K PEVcn,PEVd1K PEVdn,Tap1K Tapn,C1K Cn]
Wherein, QPViFor the reactive power of photovoltaic unit, PEVci、PEVdiFor electric car charge and discharge active power, TapiFor
On-load transformer tap changer gear；CiFor capacitor switching group number, and CiIt is 0；
Step 32: determining that the reactive power of each photovoltaic unit, electric car fill, put active power and on-load regulator transformer
After tap joint position variable, population environment is initialized；
Step 33: each node initial voltage iterative value being determined by Load flow calculation, and carries out the calculating of fitness function；
Step 34: updating particle position and speed；
Step 35: according to the particle position updated, carrying out the update of individual and global extremum；
Step 36: judging whether to meet algorithm termination condition, algorithm terminates and carry out step 37 if meeting, and otherwise returns
Return step 33；
Step 37: output optimal solution set and adaptive optimal control degree functional value, obtain certain moment in one day it is optimal photovoltaic it is idle
Value, the controllable capacity of electric car.
In one possible implementation, in step 4, described using containing photovoltaic, electric car, on-load voltage regulation transformation
The source lotus of device and capacitor coordinate regulating and controlling voltage model carry out regulating and controlling voltage process the following steps are included:
Step 41: the source lotus containing photovoltaic, electric car, on-load regulator transformer and capacitor is coordinated into regulating and controlling voltage mould
The control variable of type is expressed as:
X=[QPV1K QPVn,PEVc1K PEVcn,PEVd1K PEVdn,Tap1K Tapn,C1K Cn]
Wherein, QPViFor the reactive power of photovoltaic unit, PEVci、PEVdiFor electric car charge and discharge active power, TapiFor
On-load transformer tap changer gear；CiFor capacitor switching group number；
Step 42: determining that the reactive power of each photovoltaic unit, electric car fill, put active power and on-load regulator transformer
After tap joint position variable, population environment is initialized, and to CiCoding；
Step 43: carrying out sliding-model control, sliding-model control expression formula are as follows:
Xi=ROUND (Xi_temp)
Wherein, Xi_tempCoordinate the interim control variable of regulating and controlling voltage model for source lotus；
Step 44: each node initial voltage iterative value being determined by Load flow calculation, and carries out the calculating of fitness function；
Step 45: updating particle position and speed；
Step 46: according to the particle position updated, carrying out the update of individual and global extremum；
Step 47: judging whether to meet algorithm termination condition, algorithm terminates and carry out step 48 if meeting, and otherwise returns
Return step 44；
Step 48: output optimal solution set and adaptive optimal control degree functional value, obtain certain moment in one day it is optimal photovoltaic it is idle
Value, the controllable capacity of electric car.
Photovoltaic based on different meteorologic factors is contributed at random and the electric car uncertain load condition of demand response
Under, the regulating and controlling voltage model using system regulation cost minimization as target is established, is calculated reasonably by particle swarm algorithm
Controllable resources power output.
In one possible implementation, the assigned voltage upper limit value is (1+7%) * voltage rating.
In one possible implementation, the assigned voltage lower limit value is (1-7%) * voltage rating.
The interactive relationship of combination of embodiment of the present invention load side and source side, grid side, meter and its Demand Side Response characteristic,
It is able to solve the out-of-limit problem of distribution network voltage of grid-connected generation.
Application principle and example of the invention
One, the distribution network voltage control strategy that source lotus is coordinated
Photovoltaic power generation converts the solar into electric energy by the photovoltaic effect of photovoltaic array, output power mainly by
The received solar radiation total amount of photovoltaic array surface institute determines.Photovoltaic power output has certain poor under the influence of different weather environments
The opposite sex, as shown in Fig. 2.Different degrees of impact can be caused to distribution network voltage when being incorporated into the power networks, increases system adjusting
The difficulty of voltage.
Grid-connected photovoltaic array obtains direct current after the transformation of DC/DC converter, is connected by inverter with power grid, through inversion
Photovoltaic power generation grid-connecting system active power of output P after device inversionPVAnd reactive power QPVAre as follows:
In formula, UAFor photovoltaic generating system grid entry point voltage；UPFor power grid side bus voltage；X is equivalent line reactance；δ table
Show the phase angle difference between inverter output voltage and network voltage.Meanwhile considering photovoltaic power generation grid-connecting system in each period herein
Reactive power interior to be run using constant power factor cos φ (φ is power-factor angle), then that photovoltaic exports are as follows:
QPV=PPVtan(arccosφ) (3)
And when the active output of photovoltaic power generation grid-connecting system is less than the rated capacity of photovoltaic DC-to-AC converter in power distribution network, it is remaining
Capacity can provide reactive power support to power distribution network, to realize the reactive compensation to power distribution network.The idle fan-out capability of photovoltaic DC-to-AC converter
Mainly by its capacity limit, the relationship of regulatable reactive capability and inverter capacity are as follows:
In formula,It is photovoltaic DC-to-AC converter maximum without work output, SPVFor inverter capacity.With this can find out inverter without
The controllable capacity of function.
Meanwhile according to part throttle characteristics and electricity consumption priority, participate in using electric car as transferable load.It can turn
Move the load that load refers to that its each period can be adjusted flexibly with power mode in optimizing cycle.Present invention consideration has V2G skill
The electric car of art, under the premise of normal trip, electric automobile power battery as the biggish energy-storage units of capacity,
It, can be by electrical energy changer to electric system feedback electric energy when electric car is stopped transport；It, can be from when electric car needs to charge
System obtains electric energy, to realize V2G operational mode.It is born at random by the in a few days electric car that Monte Carlo Analogue Method obtains
Lotus curve is as shown in Fig. 3.
In system level, by considering that the load value of user's participation demand response (DR) accounts for the ratio expression of original minus charge values
DR participates in wish μ, it is assumed that total electricity consumption of the electric car within its cycle of operation is fixed value, and system can be according to demand to each
Electric car in period is regulated and controled, and part throttle characteristics may be expressed as:
In formula, PEV,tFor in the transferable electric car charge-discharge electric power size of t moment；PEVs,tIt is original for t moment load
Value.
Therefore, comprehensively consider system voltage level and economical operation requirement, and participate in the source of coordinated control, lotus operation spy
Point is different, and the characteristics of belong to different Interest Main Bodies, according to the load condition of power distribution network itself, photovoltaic power generation situation,
V2G unit active volume data, determine the active and idle variable capacity of each node, by coordinating photovoltaic unit, electric car
Operating status, while consider user side demand response (DR) and source net between interactive relationship, using electric car as motivate
Type DR optimizes it and coordinates capacity, and combine the pressure regulation energy of on-load regulator transformer and capacitor to compensate electricity price as measurement standard
Power realizes voltage stabilization jointly.
To carry out system voltage regulation at times in a few days per hour for time scale.It is at a time in judgement system
It is no have voltage out-of-limit situation after, determine the voltage value in the moment be more the upper limit or more lower limit, if being above on assigned voltage
Limit value then carries out regulation capacity to the photovoltaic power generation grid-connecting system, electric car and the OLTC that participate in regulation in system and determines；If
Beyond lower voltage limit specified value, then capacitor is added and carries out controllable resources coordination, with this recovery system voltage, and keeps voltage steady
It is fixed.
The present invention is special using the operation of source side photovoltaic DC-to-AC converter Reactive-power control ability and the charge and discharge of load side electric car
Property, Problem of Over High-Limit Voltage is solved in conjunction with on-load regulator transformer；If voltage occur gets over lower limit phenomenon, increase capacitor progress
Reactive compensation forms a kind of distribution network voltage regulating strategy counted and source lotus is coordinated.
Two, source lotus coordinates regulating and controlling voltage model
Under normal circumstances, photovoltaic power generation grid-connecting system operates in maximal power tracing state, and being generally not allowed reduction, it has
Function output, therefore it is regarded as uncontrollable active power supply, it is only used as controllable reactive source and participates in regulation, idle power output controls cost CPV
It may be expressed as:
CPV=CPVcQPV,t (6)
In formula, CPVcExpense, Q are controlled for photovoltaic power generation grid-connecting system reactive power unitPV,tFor t moment photovoltaic DC-to-AC converter
Reactive-power control amount.
The comfort level and its economic loss that would necessarily affect user for electric car, in regulation process, can lead to
The control methods of valence compensation are crossed, motivates user's active response in voltage out-of-limit to dispatch, is managed collectively by power distribution network.And regulate and control
Electric car quantity it is more, caused by economic loss it is also bigger, i.e. compensation cost and the electric car charge and discharge electric work that is regulated and controled
Rate is positively correlated.Assuming that participate in regulation electric automobile power battery in per time instance be invariable power charge and discharge, foundation can
Regulate and control shown in electric car compensation cost function such as formula (7), CEVIndicate controllable electric car compensation cost, the i.e. regulation measure
Corresponding communication cost, economy and comfort level failure costs.
CEV=KEVcPEV,t (7)
In formula, KEVcCoefficient, P are subsidized to give the charge and discharge unit quantity of electricity of userEV,tThe electronic vapour regulated and controled by t moment
Vehicle charge and discharge active power.
Consider that on-load regulator transformer and capacitor group can generate equipment loss in movement and influence service life simultaneously,
Therefore its action control cost such as formula (8), formula (9) are shown:
CTAP=CTAPuUTapi,t (8)
CC=CCuQC,t (9)
In formula, CTAPCost, C are acted for on-load regulator transformerTAPuTake for on-load transformer tap changer unit act
With UTapi,tIts corresponding voltage variety for t moment；CCFor capacitor switching cost, CCuTake for capacitor group unit switching
With QC,tFor t moment capacitor switching variable quantity.
According to power distribution network day endogenous lotus operation characteristic, in the premise for guaranteeing system one day mixed economy cost minimization of operation
Under, the power output plan of each controllable resources of reasonable arrangement carries out pressure regulation.In a few days per hour for time scale, to carry out the whole network at times
Optimization comprehensively utilizes the pressure regulating performance of PV, EV, OLTC and capacitor, with the minimum optimization aim of regulation and control cost:
In formula, f is system regulation cost；N is photovoltaic power generation grid-connecting system access number of nodes in power distribution network；N is electronic vapour
Vehicle grid node number；ω1、ω2、ω3、ω4For weight coefficient, andK=4；λ is voltage out-of-limit penalty factor.
Wherein, f (Ui) it is that voltage constraint is added as penalty function into objective function:
In formula, UiFor node voltage each in system, Ui_min、Ui_maxRespectively node voltage upper lower limit value, herein with reference to
" 12325 power quality supply voltage deviation of GB/T " will seek ± 7%.
Model constraint condition is as follows:
(1) equality constraint, that is, node trend constraint:
Wherein, PPVi、QPViActive and reactive power output by accessing photovoltaic power generation grid-connecting system in node i；PLi_load、
QLi_loadPower is consumed for burden with power conventional in node i, load or burden without work；PEVi、QEViHad by connecing electric car in node i
Function, reactive power；Ui、UjIt is the voltage magnitude of node i Yu node j respectively；Gij、Bij、θijRespectively between node i and node j
Real part, imaginary part and the phase difference of voltage of admittance matrix.
(2) photovoltaic power generation grid-connecting System Reactive Power units limits
QPVi_min≤QPVi,t≤QPVi_max (13)
Wherein, QPVi_min、QPVi_maxRespectively photovoltaic Reactive-power control capacity upper and lower limit.
(3) electric car charge-discharge electric power constrains
Wherein, PEVci,t、PEVdi,tThe respectively charge and discharge power of the controllable electric car of node i；PEVci_min、
PEVci_max、PEVdi_min、PEVdi_maxThe respectively controllable electric car charge and discharge maximum of node i, minimum active power.
(4) shunt capacitor switching capacity-constrained
QC_min≤QC,t≤QC_max (15)
Wherein, QC_min、QC_maxRespectively capacitor switching capacity upper and lower limit.
(5) on-load transformer tap changer gear voltage constrains
UTapi_min≤UTapi,t≤UTapi_max (16)
Wherein, UTapi_min、UTapi_maxRespectively have and carries load tap changer gear corresponding voltage upper and lower limit.
It contributes at random the present invention is based on the photovoltaic of different meteorologic factors and the electric car uncertainty of demand response is negative
Under the conditions of lotus, the regulating and controlling voltage model using system regulation cost minimization as target is established, is calculated by particle swarm algorithm
Reasonable controllable resources power output.
Method for solving selects particle group optimizing to calculate.In an iterative process, since control variable uses continuously in iteration
Real coding, on-load regulator transformer no-load voltage ratio and capacitor switching capacity are discrete variable, therefore are needed before Load flow calculation to having
Voltage adjustment of on-load transformer voltage ratio carries out sliding-model control, processing mode be obtained after optimizing have load adjustable transformer no-load voltage ratio and nothing
Function compensating capacitor switching group number rounds up, and updates the transformer voltage ratio of corresponding branch and the capacitor group of investment later
Number carries out Load flow calculation.
Fig. 4 is to utilize the distribution network voltage regulation method of a kind of meter proposed by the present invention and the coordination of source lotus electric to the coordination of source lotus
Press the specific flow chart of regulation；As shown in figure 4, the specific implementation step that the present invention regulates and controls distribution network voltage is as follows:
Step 1: calculating each node voltage in power distribution network using Forward and backward substitution method, generate the initial launch shape of power distribution network
State；
Step 2: judging that each node voltage is whether in the prescribed limit of voltage desired value in power distribution network, if voltage is described
In range, then each node voltage value is directly exported, pressure regulation terminates；If carrying out step 3 not in the range；
Step 3: judging whether voltage is more than voltage rating+7%, that is, whether voltage gets over the upper limit, if being more than limit value
Carry out the regulating and controlling voltage of next step；If being all unsatisfactory for above-mentioned requirements, it can be determined as that voltage gets over lower limit, switchs to step 4.
The step of specific regulation Over High-Limit Voltage phenomenon are as follows:
(1) it establishes the above-mentioned source lotus containing photovoltaic, electric car, on-load regulator transformer and coordinates regulating and controlling voltage model；It solves
Method uses particle swarm algorithm, and the state variable in Optimized model includes that node is active and reactive, after determining control variable,
These variables can be acquired by Load flow calculation.Coordinate source side photovoltaic DC-to-AC converter, load side electric car when Over High-Limit Voltage
Voltage control is carried out with on-load regulator transformer in system, therefore, control variable includes the reactive power, electronic of each photovoltaic unit
Automobile fills, puts active power and on-load transformer tap changer position, and control variable may be expressed as:
X=[QPV1K QPVn,PEVc1K PEVcn,PEVd1K PEVdn,Tap1K Tapn,C1K Cn]
Wherein, QPViFor the reactive power of photovoltaic unit, PEVci、PEVdiFor electric car charge and discharge active power, TapiFor
On-load transformer tap changer gear；CiFor capacitor switching group number, this control it is not related to when solving Over High-Limit Voltage situation
Variable processed is herein 0, if voltage occur gets over lower limit situation, this variable is added, is solved；
(2) after determining variable, population environment is initialized；
(3) each node initial voltage iterative value is determined by Load flow calculation, and carries out the calculating of fitness function；
(4) particle position and speed are updated；
(5) according to the particle position updated, the update of individual and global extremum is carried out；
(6) judge whether to meet algorithm termination condition, algorithm terminates if meeting, and carries out step (7), if not satisfied, then
It carries out step (3)；
(7) optimal solution set and adaptive optimal control degree functional value are exported, obtains the optimal photovoltaic of certain moment in one day without work value, electricity
The controllable capacity of electrical automobile；
Step 4: when voltage value is determined as -7% less than voltage rating, i.e., voltage gets over lower limit, and capacitor is included in regulation
In measure, source lotus coordination regulating and controlling voltage model of the foundation containing photovoltaic, electric car, on-load regulator transformer and capacitor, and
Particle swarm algorithm controls in variable to CiCoding carries out the calculating of each control amount according to step (2)-(7).
Wherein, it is by the way that the switching group number of optimal on-load transformer tap changer gear and capacitor group is calculated
Discontinuous amount need to carry out sliding-model control, then carry out Load flow calculation to it, embody before calculating update fitness value
Formula are as follows:
Xi=ROUND (Xi_temp)
Step 5: being pushed forward back substitution Load flow calculation in the hope of what the optimal solution that solution obtains carried out meter and above-mentioned Regulation Control variable, weight
Newly calculate each node voltage；
Step 6: voltage is judged whether in expected range, if voltage in the range, directly exports each node electricity
Pressure value, pressure regulation terminate, and realize that full electric network voltage out-of-limit restores.
In conclusion the present invention comprehensively considers the characteristic of system interior power side Yu load side controllable resources, it will be considered that user
The electric car and photovoltaic DC-to-AC converter of demand response, and traditional pressure regulation method combine, and form a kind of regulating and controlling voltage strategy, and
It is solved by model foundation, and with particle swarm algorithm, the voltage in power distribution network is restored.
Compared with prior art, technical solution of the embodiment of the present invention has the following advantages that and good effect:
(1) consider to carry out regulating and controlling voltage using the controllable burden characteristic of load side, in the Reactive-power control ability of photovoltaic unit
When reaching the upper limit, the power output that can avoid renewable energy is cut down, and guarantees the utilization rate of clean energy resource；
(2) when carrying out voltage control using controllable burden, the influence to user side, meter and its demand response are considered, excellent
To compensate electricity price as measurement standard during change, the response capacity as small as possible using controllable burden, and then realize voltage tune
It is whole, effectively reduce voltage fluctuation.
(3) the Reactive-power control ability and controllable burden characteristic, on-load voltage regulation for comprehensively utilizing source side photovoltaic DC-to-AC converter become
The pressure regulation ability of depressor and capacitor can effectively reduce the action frequency and its equipment of on-load regulator transformer and capacitor
Loss, can be improved its service life, while can avoid putting into operation for remaining reactive-load compensation equipment, reduce cost of investment, guarantee electricity
Fast quick-recovery is pressed, range of management is effectively increased, improves the economy of whole strategy.
The above is the preferred embodiment of the present invention, for those skilled in the art,
Without departing from the principles of the invention, several improvements and modifications can also be made, these improvements and modifications are also regarded as this hair
Bright protection scope.
Claims (10)
1. the distribution network voltage that a kind of meter and source lotus are coordinated regulates and controls method, characterized in that by judging electric system in certain a period of time
Carve whether have voltage out-of-limit situation determine the voltage value in the moment be more the upper limit or more lower limit, taken with this and matched accordingly
Network voltage regulating strategy keeps voltage stabilization.
2. the distribution network voltage that a kind of meter as claimed in claim 2 and source lotus are coordinated regulates and controls method, characterized in that described to take
Corresponding distribution network voltage regulating strategy keeps the process of voltage stabilization specifically: if it is exceeding assigned voltage upper limit value,
Then regulation capacity is carried out to the photovoltaic power generation grid-connecting system, electric car and the OLTC that participate in regulation in electric system to determine；Such as
Fruit is above assigned voltage lower limit value, then capacitor is added and carries out controllable resources coordination, restores power system voltage with this, and protect
Hold voltage stabilization.
3. the distribution network voltage that a kind of meter as claimed in claim 1 or 2 and source lotus are coordinated regulates and controls method, characterized in that described
Assigned voltage upper limit value is (1+7%) * voltage rating.
4. the distribution network voltage that a kind of meter as claimed in claim 1 or 2 and source lotus are coordinated regulates and controls method, characterized in that described
Assigned voltage lower limit value is (1-7%) * voltage rating.
5. the distribution network voltage that a kind of meter and source lotus are coordinated regulates and controls method, characterized in that the following steps are included:
Step 1: calculating each node voltage in power distribution network using Forward and backward substitution method, generate the initial operating state of power distribution network；
Step 2: judging that each node voltage is whether in the prescribed limit of voltage desired value in power distribution network, if each node voltage exists
In prescribed limit, then each node voltage value is directly exported, pressure regulation terminates；If each node voltage within the specified scope, does not carry out
Step 3；
Step 3: judging whether voltage gets over the upper limit, using containing light if the voltage value in the moment is beyond assigned voltage upper limit value
Volt, electric car, on-load regulator transformer source lotus coordinate regulating and controlling voltage model carry out regulating and controlling voltage；Otherwise in the moment
Voltage value exceeds assigned voltage lower limit value, switchs to step 4；
Step 4: capacitor being included in regulation measure, using containing photovoltaic, electric car, on-load regulator transformer and capacitor
Source lotus coordinates regulating and controlling voltage model and carries out regulating and controlling voltage；
Step 5: before carrying out meter and above-mentioned Regulation Control variable in the hope of the source lotus coordination regulating and controlling voltage model optimal solution that solution obtains
It pushes back for Load flow calculation, recalculates each node voltage；
Step 6: and each node voltage recalculated is judged whether in expected range, if voltage is within the specified scope,
Each node voltage value is directly exported, pressure regulation terminates.
6. the distribution network voltage that a kind of meter as claimed in claim 5 and source lotus are coordinated regulates and controls method, characterized in that in conjunction with load
Grid-connected power output is not under the negative rules and Demand Side Response characteristic of side electric car, and different meteorologic factor
Together, the source lotus of foundation coordinates the objective function of regulating and controlling voltage model are as follows:
In formula, F is system regulation cost；N is photovoltaic power generation grid-connecting system access number of nodes in power distribution network；N be electric car simultaneously
Net number of nodes；ω1、ω2、ω3、ω4For weight coefficient, andK=4；λ is voltage out-of-limit penalty factor；f(Ui) it is electricity
Pressure constraint penalty function:
In formula, UiFor node voltage each in system, Ui_min、Ui_maxRespectively node voltage upper lower limit value；Constraint condition are as follows:
(1) equality constraint, that is, node trend constraint:
Wherein, PPVi、QPViActive and reactive power output by accessing photovoltaic power generation grid-connecting system in node i；PLi_load、QLi_loadFor
Conventional burden with power, load or burden without work consume power in node i；PEVi、QEViBy connecing the active and reactive function of electric car in node i
Rate；Ui、UjIt is the voltage magnitude of node i Yu node j respectively；Gij、Bij、θijAdmittance matrix respectively between node i and node j
Real part, imaginary part and phase difference of voltage；
(2) photovoltaic power generation grid-connecting System Reactive Power units limits:
QPVi_min≤QPVi,t≤QPVi_max
Wherein, QPVi_min、QPVi_maxRespectively photovoltaic Reactive-power control capacity upper and lower limit；
(3) electric car charge-discharge electric power constrains:
Wherein, PEVci,t、PEVdi,tThe respectively charge and discharge power of the controllable electric car of node i；PEVci_min、PEVci_max、
PEVdi_min、PEVdi_maxThe respectively controllable electric car charge and discharge maximum of node i, minimum active power；
(4) shunt capacitor switching capacity-constrained:
QC_min≤QC,t≤QC_max
Wherein, QC_min、QC_maxRespectively capacitor switching capacity upper and lower limit；
(5) on-load transformer tap changer gear voltage constrains:
UTapi_min≤UTapi,t≤UTapi_max
Wherein, UTapi_min、UTapi_maxRespectively have and carries load tap changer gear corresponding voltage upper and lower limit.
7. the distribution network voltage that a kind of meter as claimed in claim 6 and source lotus are coordinated regulates and controls method, characterized in that in step 3
In, it is described to coordinate regulating and controlling voltage model progress regulating and controlling voltage using the source lotus containing photovoltaic, electric car, on-load regulator transformer
Process the following steps are included:
Step 31: the control argument table of regulating and controlling voltage model will be coordinated containing the source lotus of photovoltaic, electric car, on-load regulator transformer
It is shown as:
X=[QPV1K QPVn,PEVc1K PEVcn,PEVd1K PEVdn,Tap1K Tapn,C1K Cn]
Wherein, QPViFor the reactive power of photovoltaic unit, PEVci、PEVdiFor electric car charge and discharge active power, TapiTo there is load
Adjustable transformer tap gear；CiFor capacitor switching group number, and CiIt is 0；
Step 32: determining that the reactive power of each photovoltaic unit, electric car fill, put active power and on-load regulator transformer tap
After head location variable, population environment is initialized；
Step 33: each node initial voltage iterative value being determined by Load flow calculation, and carries out the calculating of fitness function；
Step 34: updating particle position and speed；
Step 35: according to the particle position updated, carrying out the update of individual and global extremum；
Step 36: judging whether to meet algorithm termination condition, algorithm terminates and carries out step 37 if meeting, and otherwise returns to step
Rapid 33；
Step 37: output optimal solution set and adaptive optimal control degree functional value obtains the optimal photovoltaic of certain moment in one day without work value, electricity
The controllable capacity of electrical automobile.
8. the distribution network voltage that a kind of meter as claimed in claim 6 and source lotus are coordinated regulates and controls method, characterized in that in step 4
In, it is described to coordinate regulating and controlling voltage model progress electricity using the source lotus containing photovoltaic, electric car, on-load regulator transformer and capacitor
Press regulation process the following steps are included:
Step 41: the source lotus containing photovoltaic, electric car, on-load regulator transformer and capacitor is coordinated into regulating and controlling voltage model
Control variable is expressed as:
X=[QPV1K QPVn,PEVc1K PEVcn,PEVd1K PEVdn,Tap1K Tapn,C1K Cn]
Wherein, QPViFor the reactive power of photovoltaic unit, PEVci、PEVdiFor electric car charge and discharge active power, TapiTo there is load
Adjustable transformer tap gear；CiFor capacitor switching group number；
Step 42: determining that the reactive power of each photovoltaic unit, electric car fill, put active power and on-load regulator transformer tap
After head location variable, population environment is initialized, and to CiCoding；
Step 43: carrying out sliding-model control, sliding-model control expression formula are as follows:
Xi=ROUND (Xi_temp)
Wherein, Xi_tempCoordinate the interim control variable of regulating and controlling voltage model for source lotus；
Step 44: each node initial voltage iterative value being determined by Load flow calculation, and carries out the calculating of fitness function；
Step 45: updating particle position and speed；
Step 46: according to the particle position updated, carrying out the update of individual and global extremum；
Step 47: judging whether to meet algorithm termination condition, algorithm terminates and carries out step 48 if meeting, and otherwise returns to step
Rapid 44；
Step 48: output optimal solution set and adaptive optimal control degree functional value obtains the optimal photovoltaic of certain moment in one day without work value, electricity
The controllable capacity of electrical automobile.
9. the distribution network voltage that a kind of meter and source lotus as described in claim 5-8 any one are coordinated regulates and controls method, feature
It is that the assigned voltage upper limit value is (1+7%) * voltage rating.
10. the distribution network voltage that a kind of meter and source lotus as described in claim 5-8 any one are coordinated regulates and controls method, feature
It is that the assigned voltage lower limit value is (1-7%) * voltage rating.
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