CN106887852B - A kind of intermittent distributed generation resource voltage & var control strategy setting method on the spot - Google Patents

A kind of intermittent distributed generation resource voltage & var control strategy setting method on the spot Download PDF

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CN106887852B
CN106887852B CN201710129611.XA CN201710129611A CN106887852B CN 106887852 B CN106887852 B CN 106887852B CN 201710129611 A CN201710129611 A CN 201710129611A CN 106887852 B CN106887852 B CN 106887852B
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distributed generation
generation resource
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CN106887852A (en
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赵金利
李雨薇
李鹏
王成山
宋关羽
冀浩然
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Suzhou Junhao Electric Power Co.,Ltd.
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Tianjin University
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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
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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]
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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Abstract

A kind of intermittent distributed generation resource voltage & var control strategy setting method on the spot: according to selected distribution system, incoming line parameter, load level, network topology connection relationship, the constraint of system working voltage and branch current limitation, type, on-position, capacity and the parameter of intermittent distributed generation resource, running optimizatin period internal loading and intermittent distributed generation resource operation characteristic prediction curve, the initial value of system reference voltage and reference power；Establish the intermittent distributed generation resource of active power distribution network voltage & var control strategy adjusting model on the spot；Non-linear objective function in model and constraint condition are subjected to linearisation conversion, become mixed integer linear programming model；Mixed integer linear programming model is solved tool using mixed integer linear programming to solve；Export solving result.The present invention fully considers the randomness and fluctuation of distributed generation resource and load, is solved using mixed integer linear programming method, and intermittent distributed generation resource voltage & var control strategy on the spot is obtained.

Description

A kind of intermittent distributed generation resource voltage & var control strategy setting method on the spot
Technical field
The present invention relates to a kind of distributed generation resource control strategies on the spot.Just more particularly to a kind of intermittent distributed generation resource Ground voltage is idle control strategy setting method.
Background technique
Highest attention to the energy and environment so that the development of power distribution network is faced with new pressure and challenge, these pressure and It challenges while being also the important opportunity for pushing conventional electrical distribution net to develop to active power distribution network.In recent years, including photovoltaic Intermittent distributed generation resource (Distributed Generation, DG) including (Photovoltaic, PV), blower etc. is a large amount of Access power distribution network.With the continuous improvement of intermittent distributed generation resource permeability, reversal tidal current, the control of idle and voltage etc. Problem is increasingly serious.Especially, the access of intermittent distributed generation resource no matter on time or space all have it is very strong not Certainty often leads to feeder line power fluctuation in operation, causes serious voltage out-of-limit problem.
Currently, active power distribution network mainly uses centerized fusion and controls two different strategies on the spot to realize system Operation control.Wherein, centerized fusion strategy can use global information, and unified allocation of resources controllable resources obtain global optimization Control performance, but with the raising of distributed generation resource permeability intermittent in active power distribution network, extensive intermittent distributed electrical The mass data in source brings heavy communication and data processing load, and the time delay of centerized fusion strategy increases, and in the middle When control system being entreated to break down, whole system has the risk of failure；In addition, the considerations of for privacy and secure context, Centerized fusion possibly can not obtain details.Although and local measurement information can only be obtained on the spot by controlling, and cannot achieve complete Office is optimal, but does not need the information interchange between node or long-range measurement, to reduce the data volume of communication, reduces control and becomes The dimension of amount；Simultaneously as distributed power generation fluctuation is larger, control strategy can be responded rapidly on the spot, to quickly inhibit wave It is dynamic.
Since the power regulation of intermittent distributed generation resource is consecutive variations, running optimizatin problem is from the single time Section is extended to continuous time series, it is necessary to the intermittent distributed generation resource of the active power distribution network of timing voltage power-less on the spot Control strategy adjusts solution basis of the model as optimization problem.The model mathematics is substantially that mixed integer nonlinear programming is asked Topic brings biggish challenge to calculating to solve.Therefore, it is necessary to one kind to convert mixed integer nonlinear programming problem to The linearization technique for the Mixed integer linear programming that can effectively solve, to solve the intermittent distributed electrical of active power distribution network Voltage & var control strategy adjusts model on the spot in source, to make intermittent distributed generation resource voltage & var control plan on the spot Slightly.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of randomness for fully considering distributed generation resource and load and The intermittent distributed generation resource of fluctuation voltage & var control strategy setting method on the spot.
The technical scheme adopted by the invention is that: a kind of intermittent distributed generation resource voltage & var control strategy adjusting on the spot Method includes the following steps:
1) according to selected distribution system, incoming line parameter, load level, network topology connection relationship, system operation Voltage constraint and branch current limitation, type, on-position, capacity and the parameter of intermittent distributed generation resource, running optimizatin week Phase internal loading and intermittent distributed generation resource operation characteristic prediction curve, the initial value of system reference voltage and reference power；
2) the distribution system structure and parameter provided according to step 1) considers intermittent distributed generation resource power output and load Temporal characteristics establish the intermittent distributed generation resource of active power distribution network voltage & var control strategy adjusting model on the spot, comprising: choose Root node is balance nodes, sets the minimum objective function of the sum of active power distribution system voltage deviation, considers system load flow respectively Constraint, system operation constraint, the operation constraint of intermittent distributed generation resource；
3) by non-linear mesh in the intermittent distributed generation resource of active power distribution network on the spot voltage & var control strategy adjusting model Scalar functions and constraint condition carry out linearisation conversion, it is inverted after the model of step 2) be mixed integer linear programming model；
4) mixed integer linear programming model tool is solved using mixed integer linear programming to solve；
5) solving result of step 4), i.e., the relevant parameter of intermittent distributed generation resource voltage & var control strategy are exported.
The minimum objective function of the sum of active power distribution system voltage deviation described in step 2) is expressed as follows:
Or
In formula, NTFor when discontinuity surface number, NNFor system node sum；Vt,iFor the voltage magnitude of t period node i；For Maximum voltage threshold,For minimum voltage threshold, work as Vt,iNot in desired voltage rangeWhen, objective function is used To reduce voltage deviation.
System load flow constraint representation described in step 2) is
In formula, ΩbFor the set of branch；RjiFor the resistance of branch ji, XjiFor the reactance of branch ji；It,jiFor the t period Point j flows to the current amplitude of node i；Vt,iFor the voltage magnitude of t period node i, Vt,jFor the voltage magnitude of t period node j； Pt,ijThe active power of node j, Q are flowed to for t period node it,ijThe reactive power of node j is flowed to for t period node i；Pt,ikFor T period node i flows to the active power of node k, Qt,ikThe reactive power of node k is flowed to for t period node i；Pt,iFor the t period The sum of active power injected in node i,For in t period node i distributed generation resource inject active power,For t The active power that load consumes in period node i, Qt,iFor the sum of the reactive power injected in t period node i,For the t period The reactive power that distributed generation resource injects in node i,The reactive power consumed for load in t period node i.
System described in step 2) runs constraint representation
In formula, VmaxFor the maximum value that system voltage allows, VminThe minimum value allowed for system voltage；ImaxFor branch electricity Flow the maximum value allowed, Vt,iFor the voltage magnitude of t period node i, It,ijThe current amplitude of node j is flowed to for t period node i.
Intermittent distributed generation resource described in step 2) runs constraint representation and is
In formula,For the intermittent distributed generation resource capacity of node i,For intermittent distribution in t period node i The available reactive power upper limit of formula power supply；For distributed generation resource intermittent in t period node i injection active power,For the reactive power of distributed generation resource intermittent in t period node i injection；Vt,iFor the voltage magnitude of t period node i,For the expression formula of intermittent distributed generation resource voltage & var control strategy on the spot,In the presence of adjusting dead zone WithRespectively the voltage of voltage & var control strategy adjusts dead zone most on the spot Small value and maximum value, in the dead zone, the reactive power that intermittent distributed generation resource generates are 0Var；Following formula constitutes intermittent distribution The expression formula of formula power supply voltage & var control strategy on the spot
Step 3) includes:
(1) U is usedt,iReplace quadratic termSystem load flow constraint and system operation constraint are linearized:
(Vmin)2=U2,t,i≤(Vmax)2 (15)
In formula, RijFor the resistance of branch ij, XijFor the reactance of branch ij；It,ijThe electricity of node j is flowed to for t period node i Flow amplitude；Vt,iFor the voltage magnitude of t period node i；Pt,ijThe active power of node j, Q are flowed to for t period node it,ijWhen for t Duan Jiediani flows to the reactive power of node j；VmaxFor the maximum value that system voltage allows, VminThe minimum allowed for system voltage Value；
(2) contain absolute value term in objective functionWith auxiliary variable At,iReplacement, and increase constraint:
At,i≥0 (19)
In formula, NTFor when discontinuity surface number, NNFor system node sum；For maximum voltage threshold,For minimum electricity Press threshold value；
(3) expression formula of intermittent distributed generation resource voltage & var control strategy on the spotFor non-linear expressions, adopt With piece-wise linearization realization pairExact linearization method；By introducing auxiliary variable at,i,n, n=1,2 ..., 6 and dt,i,n,n =1,2 ..., 5, using a series of line segments come approximateDefined curve, as follows:
at,i,1≤dt,i,1,at,i,6≤dt,i,5 (22)
at,i,n≤dt,i,n+dt,i,n-1, n=2,3,4,5 (23)
at,i,n≥0,dt,i,n∈{0,1} (24)
In formula, at,i,n, n=1,2 ..., 6 be continuous variable, dt,i,n, n=1,2 ..., 5 be integer variable；WithRespectively on the spot voltage & var control strategy voltage adjust dead zone minimum value and maximum value；
Introduce auxiliary integer variable ci,1And ci,2By non-linear product termWithLinearisation, then It indicates are as follows:
ci,1≤ci,2 (28)
Wherein, at,i,3ci,1And at,u,4ci,2It is non-linear product term, introduces binary variable li,1,mAnd li,2,m, m=0, 1 ..., 4, respectively indicate at,i,3ci,1And at,i,4ci,2:
Introduce auxiliary variable wt,i,1,mReplace at,i,3li,1,m, auxiliary variable wt,i,2,mReplace at,i,4li,2,m, and increase following Constraint, wherein taking M is sufficiently large positive real number:
at,i,3-(1-li,1,m)M≤wt,i,1,m≤at,i,3 (31)
0≤wt,i,1,m≤li,1,mM (32)
at,i,4-(1-li,2,m)M≤wt,i,2,m≤at,i,4 (33)
0≤wt,i,2,m≤li,2,mM (34)
(4) contain in system load flow constraint and system operation constraintBy it in predicted value point First order Taylor expansion is carried out, and increases constraint:
ht,ij≤(Imax)2 (38)
In formula, ΩbFor the set of branch；Pt,jiThe active power of node i, Q are flowed to for t period node jt,jiFor the t period Point j flows to the reactive power of node i；RjiFor the resistance of branch ji, XjiFor the reactance of branch ji；Pt,iTo be infused in t period node i The sum of active power entered, Qt,iFor the sum of the reactive power injected in t period node i；Pt,ikNode is flowed to for t period node i The active power of k, Qt,ikThe reactive power of node k is flowed to for t period node i；ImaxThe maximum value allowed for branch current.
A kind of intermittent distributed generation resource of the invention voltage & var control strategy setting method on the spot, based on the company of solution The problem of tuning of intermittent distributed generation resource under continuous time series voltage & var control strategy on the spot, fully considers distributed electrical The randomness and fluctuation in source and load, establishing the intermittent distributed generation resource of active power distribution network, voltage & var control strategy is whole on the spot Cover half type is solved using mixed integer linear programming method, obtains intermittent distributed generation resource voltage & var control on the spot Strategy.
Detailed description of the invention
Fig. 1 is modified 69 node example structure chart of IEEE；
Fig. 2 is a kind of intermittent distributed generation resource of the invention voltage & var control strategy setting method flow chart on the spot；
Fig. 3 is intermittent distributed generation resource and load operation Predicting Performance Characteristics curve；
Fig. 4 a is intermittent distributed generation resource voltage & var control strategy on the spot at obtained node 26 after optimization；
Fig. 4 b is intermittent distributed generation resource voltage & var control strategy on the spot at obtained node 50 after optimization；
Fig. 5 is the reactive compensation situation that intermittent distributed generation resource issues；
Fig. 6 a is the voltage's distribiuting situation at the node 26 of optimization front and back；
Fig. 6 b is the voltage's distribiuting situation at the node 50 of optimization front and back；
Fig. 7 is whole network voltage the extreme value distribution situation under different control strategies.
Specific embodiment
Below with reference to embodiment and attached drawing to a kind of intermittent distributed generation resource of the invention voltage & var control plan on the spot Slightly setting method is described in detail.
As shown in Fig. 2, a kind of intermittent distributed generation resource of the invention voltage & var control strategy setting method on the spot, packet Include following steps:
1) according to selected distribution system, incoming line parameter, load level, network topology connection relationship, system operation Voltage constraint and branch current limitation, type, on-position, capacity and the parameter of intermittent distributed generation resource, running optimizatin week Phase internal loading and intermittent distributed generation resource operation characteristic prediction curve (as shown in Figure 3), system reference voltage and reference power Initial value；
2) the distribution system structure and parameter provided according to step 1) considers intermittent distributed generation resource power output and load Temporal characteristics establish the intermittent distributed generation resource of active power distribution network voltage & var control strategy adjusting model on the spot, comprising: choose Root node is balance nodes, sets the minimum objective function of the sum of active power distribution system voltage deviation, considers system load flow respectively Constraint, system operation constraint, the operation constraint of intermittent distributed generation resource；Wherein
(1) the minimum objective function of the sum of the active power distribution system voltage deviation described in is expressed as follows:
Or
In formula, NTFor when discontinuity surface number, NNFor system node sum；Vt,iFor the voltage magnitude of t period node i；For Maximum voltage threshold,For minimum voltage threshold, work as Vt,iNot in desired voltage rangeWhen, objective function is used To reduce voltage deviation.
(2) the system load flow constraint representation described in is
In formula, ΩbFor the set of branch；RjiFor the resistance of branch ji, XjiFor the reactance of branch ji；It,jiFor the t period Point j flows to the current amplitude of node i；Vt,iFor the voltage magnitude of t period node i, Vt,jFor the voltage magnitude of t period node j； Pt,ijThe active power of node j, Q are flowed to for t period node it,ijThe reactive power of node j is flowed to for t period node i；Pt,ikFor T period node i flows to the active power of node k, Qt,ikThe reactive power of node k is flowed to for t period node i；Pt,iFor the t period The sum of active power injected in node i,For in t period node i distributed generation resource inject active power,For t The active power that load consumes in period node i, Qt,iFor the sum of the reactive power injected in t period node i,For the t period The reactive power that distributed generation resource injects in node i,The reactive power consumed for load in t period node i.
(3) system described in runs constraint representation
In formula, VmaxFor the maximum value that system voltage allows, VminThe minimum value allowed for system voltage；ImaxFor branch electricity Flow the maximum value allowed, Vt,iFor the voltage magnitude of t period node i, It,ijThe current amplitude of node j is flowed to for t period node i.
(4) the intermittent distributed generation resource described in runs constraint representation
In formula,For the intermittent distributed generation resource capacity of node i,For intermittent distribution in t period node i The available reactive power upper limit of formula power supply；For distributed generation resource intermittent in t period node i injection active power,For the reactive power of distributed generation resource intermittent in t period node i injection；Vt,iFor the voltage magnitude of t period node i,For the expression formula of intermittent distributed generation resource voltage & var control strategy on the spot,In the presence of adjusting dead zone WithRespectively the voltage of voltage & var control strategy adjusts dead zone most on the spot Small value and maximum value, in the dead zone, the reactive power that intermittent distributed generation resource generates are 0Var；Following formula constitutes intermittent distribution The expression formula of formula power supply voltage & var control strategy on the spot
3) by non-linear mesh in the intermittent distributed generation resource of active power distribution network on the spot voltage & var control strategy adjusting model Scalar functions and constraint condition carry out linearisation conversion, it is inverted after the model of step 2) be mixed integer linear programming model； Include:
(1) U is usedt,iReplace quadratic termSystem load flow constraint and system operation constraint are linearized:
(Vmin)2≤U2,t,i≤(Vmax)2 (15)
In formula, RijFor the resistance of branch ij, XijFor the reactance of branch ij；It,ijThe electricity of node j is flowed to for t period node i Flow amplitude；Vt,iFor the voltage magnitude of t period node i；Pt,ijThe active power of node j, Q are flowed to for t period node it,ijWhen for t Duan Jiediani flows to the reactive power of node j；VmaxFor the maximum value that system voltage allows, VminThe minimum allowed for system voltage Value.
(2) contain absolute value term in objective functionWith auxiliary variable At,iReplacement, and increase constraint:
At,i≥0 (19)
In formula, NTFor when discontinuity surface number, NNFor system node sum；For maximum voltage threshold,For minimum electricity Press threshold value.
(3) expression formula of intermittent distributed generation resource voltage & var control strategy on the spotFor non-linear expressions, adopt With piece-wise linearization realization pairExact linearization method；By introducing auxiliary variable at,i,n, n=1,2 ..., 6 and dt,i,n,n =1,2 ..., 5, using a series of line segments come approximateDefined curve, as follows:
at,i,1≤dt,i,1,at,i,6≤dt,i,5 (22)
at,i,n≤dt,i,n+dt,i,n-1, n=2,3,4,5 (23)
at,i,n≥0,dt,i,n∈{0,1} (24)
In formula, at,i,n, n=1,2 ..., 6 be continuous variable, dt,i,n, n=1,2,5 be integer variable；WithRespectively on the spot voltage & var control strategy voltage adjust dead zone minimum value and maximum value；
Introduce auxiliary integer variable ci,1And ci,2By non-linear product termWithLinearisation, Then indicate are as follows:
ci,1≤ci,2 (28)
Wherein, at,i,3ci,1And at,i,4ci,2It is non-linear product term, introduces binary variable li,1,mAnd li,2,m, m=0, 1 ..., 4, respectively indicate at,i,3ci,1And at,i,4ci,2:
Introduce auxiliary variable wt,i,1,mReplace at,i,3li,1,m, auxiliary variable wt,i,2,mReplace at,i,4li,2,m, and increase following Constraint, wherein taking M is sufficiently large positive real number:
at,i,3-(1-li,1,m)M≤wt,i,1,m≤at,i,3 (31)
0≤wt,i,1,m≤li,1,mM (32)
at,i,4-(1-li,2,m)M≤wt,i,2,m≤at,i,4 (33)
0≤wt,i,2,m≤li,2,mM (34)
(4) contain in system load flow constraint and system operation constraintBy it in predicted value pointInto The expansion of row first order Taylor, and increase constraint:
In formula, ΩbFor the set of branch；Pt,jiThe active power of node i, Q are flowed to for t period node jt,jiFor the t period Point j flows to the reactive power of node i；RjiFor the resistance of branch ji, XjiFor the reactance of branch ji；Pt,iTo be infused in t period node i The sum of active power entered, Qt,iFor the sum of the reactive power injected in t period node i；Pt,ikNode is flowed to for t period node i The active power of k, Qt,ikThe reactive power of node k is flowed to for t period node i；ImaxThe maximum value allowed for branch current.
4) mixed integer linear programming model tool is solved using mixed integer linear programming to solve；
5) solving result of step 4), i.e., the relevant parameter of intermittent distributed generation resource voltage & var control strategy are exported.
The present invention is based on mixed integer linear programming method, to realize the intermittent distributed generation resource of active power distribution network electric on the spot Press the solution of idle control strategy setting method.
For this embodiment of the present invention, the impedance value of circuit element, load member first in input 69 node system of IEEE Active power a reference value and power factor, the network topology connection relationship of part, example structure is as shown in Figure 1, detail parameters are shown in Table 1 With table 2；Node 26 accesses one group of photovoltaic system, capacity 2MVA；Node 50 accesses one group of blower, capacity 2MVA；Each node The safe operation bound of voltage magnitude (per unit value) is respectively 1.10 and 0.90；Finally the reference voltage of setting system is 12.66kV, reference power 1MVA.Node voltage it is expected that traffic coverage is 0.95p.u.-1.05p.u..
It is respectively adopted and is compared and analyzed without using control means with reactive power/voltage control means on the spot, scheme I is not used Control means, scheme II is using voltage & var control model, simulation result are shown in Table 3 on the spot.
Executing the computer hardware environment that optimization calculates is Intel (R) Xeon (R) CPU E5-1620, and dominant frequency is 3.70GHz inside saves as 8GB；Software environment is 7 operating system of Windows.
Using prediction data can with the relevant parameter of the intermittent distributed generation resource of optimization voltage & var control strategy on the spot, See Fig. 4 a, Fig. 4 b, then intermittent distributed generation resource can adjust its sending according to voltage & var control strategy on the spot in real time Reactive compensation amount, Fig. 5 is seen, to effectively reduce voltage deviation.When without using control it can be seen from Fig. 6 a, Fig. 6 b and Fig. 7 When means processed, the access of high permeability distributed generation resource will lead to violent voltage fluctuation.Using intermittent distributed generation resource into Row is after voltage power-less is adjusted on the spot, when node voltage is more prescribed a time limit, intermittent distributed generation resource absorbing reactive power；Work as node voltage When lower, intermittent distributed generation resource issues reactive power and plays the role of voltage support, so that system voltage be made to maintain one A ideal level.When overtension, intermittent distributed generation resource absorbing reactive power is such as schemed to reduce voltage level Shown in 4a, Fig. 5 and Fig. 6 a.
The 69 node example load on-position table 1IEEE and power
69 node example line parameter circuit value of table 2IEEE
Simulation result under the different control strategies of table 3 compares
Control strategy Voltage minimum/p.u. Voltage max/p.u.
I. control strategy is not used 0.9298 1.0836
II. control strategy on the spot 0.9501 1.0794

Claims (5)

1. a kind of intermittent distributed generation resource voltage & var control strategy setting method on the spot, which is characterized in that including walking as follows It is rapid:
1) according to selected distribution system, incoming line parameter, load level, network topology connection relationship, system working voltage Constraint and branch current limitation, type, on-position, capacity and the parameter of intermittent distributed generation resource, in the running optimizatin period Load and intermittent distributed generation resource operation characteristic prediction curve, the initial value of system reference voltage and reference power；
2) the distribution system structure and parameter provided according to step 1) considers the timing of intermittent distributed generation resource power output and load Characteristic establishes the intermittent distributed generation resource of active power distribution network voltage & var control strategy adjusting model on the spot, comprising: choose root section Point be balance nodes, set the minimum objective function of the sum of active power distribution system voltage deviation, respectively consider system load flow constraint, System operation constraint, the operation constraint of intermittent distributed generation resource；
The intermittent distributed generation resource runs constraint representation
In formula,For the intermittent distributed generation resource capacity of node i,For intermittent distributed electrical in t period node i The available reactive power upper limit in source；For distributed generation resource intermittent in t period node i injection active power,For The reactive power of intermittent distributed generation resource injection in t period node i；VT, iFor the voltage magnitude of t period node i,For The expression formula of intermittent distributed generation resource voltage & var control strategy on the spot,In the presence of adjusting dead zone WithRespectively on the spot voltage & var control strategy voltage adjust dead zone minimum value and maximum Value, in the dead zone, the reactive power that intermittent distributed generation resource generates are 0Var；Following formula constitutes intermittent distributed generation resource on the spot The expression formula of voltage & var control strategy
3) by Nonlinear Parameter letter in the intermittent distributed generation resource of active power distribution network on the spot voltage & var control strategy adjusting model Several and constraint condition carries out linearisation conversion, it is inverted after the model of step 2) be mixed integer linear programming model；
4) mixed integer linear programming model tool is solved using mixed integer linear programming to solve；
5) solving result of step 4), i.e., the relevant parameter of intermittent distributed generation resource voltage & var control strategy are exported.
2. intermittent distributed generation resource according to claim 1 voltage & var control strategy setting method on the spot, feature It is, the minimum objective function of the sum of active power distribution system voltage deviation described in step 2) is expressed as follows:
In formula, NTFor when discontinuity surface number, NNFor system node sum；VT, iFor the voltage magnitude of t period node i；For maximum Voltage threshold,For minimum voltage threshold, work as VT, iNot in desired voltage rangeWhen, objective function is used to subtract Small voltage deviation.
3. intermittent distributed generation resource according to claim 1 voltage & var control strategy setting method on the spot, feature It is, system load flow constraint representation described in step 2) is
In formula, ΩbFor the set of branch；RjiFor the resistance of branch ji, XjiFor the reactance of branch ji；IT, jiFor t period node j stream To the current amplitude of node i；VT, iFor the voltage magnitude of t period node i, VT, jFor the voltage magnitude of t period node j；PT, ijFor t Period node i flows to the active power of node j, QT, ijThe reactive power of node j is flowed to for t period node i；PT, ikFor the t period Point i flows to the active power of node k, QT, ikThe reactive power of node k is flowed to for t period node i；PT, iFor in t period node i The sum of active power of injection,For in t period node i distributed generation resource inject active power,For the t period The active power that load consumes on point i, QT, iFor the sum of the reactive power injected in t period node i,For t period node i The reactive power of upper distributed generation resource injection,The reactive power consumed for load in t period node i.
4. intermittent distributed generation resource according to claim 1 voltage & var control strategy setting method on the spot, feature It is, the operation constraint representation of system described in step 2) is
In formula, VmaxFor the maximum value that system voltage allows, VminThe minimum value allowed for system voltage；ImaxPermit for branch current Perhaps maximum value, VT, iFor the voltage magnitude of t period node i, IT, ijThe current amplitude of node j is flowed to for t period node i.
5. intermittent distributed generation resource according to claim 1 voltage & var control strategy setting method on the spot, feature It is, step 3) includes:
(1) U is usedT, iReplace quadratic termSystem load flow constraint and system operation constraint are linearized:
(Vmin)2≤U2, t, i≤(Vmax)2 (15)
In formula, RijFor the resistance of branch ij, XijFor the reactance of branch ij；IT, ijThe electric current width of node j is flowed to for t period node i Value；VT, iFor the voltage magnitude of t period node i；PT, ijThe active power of node j, Q are flowed to for t period node iT, ijFor the t period Point i flows to the reactive power of node j；VmaxFor the maximum value that system voltage allows, VminThe minimum value allowed for system voltage；
(2) contain absolute value term in objective functionWith auxiliary variable AT, iReplacement, and increase constraint:
AT, i≥0 (19)
In formula, NTFor when discontinuity surface number, NNFor system node sum；For maximum voltage threshold,For minimum voltage threshold Value；
(3) expression formula of intermittent distributed generation resource voltage & var control strategy on the spotFor non-linear expressions, using point Section linearisation realization pairExact linearization method；By introducing auxiliary variable aT, i, n, n=1,2 ..., 6 and dT, i, n, n= 1,2 ..., 5, using a series of line segments come approximateDefined curve, as follows:
aT, i, 1≤dT, i, 1, aT, i, 6≤dT, i, 5 (22)
aT, i, n≤dT, i, n+dT, i, n-1, n=2,3,4,5 (23)
aT, i, n>=0, dT, i, n∈ { 0,1 } (24)
In formula, aT, i, n, n=1,2 ..., 6 is continuous variable, dT, i, n, n=1,2 ..., 5 is integer variable；WithRespectively on the spot voltage & var control strategy voltage adjust dead zone minimum value and maximum value；
Introduce auxiliary integer variable cI, 1And cI, 2By non-linear product termWithLinearisation, then it represents that Are as follows:
cI, 1≤cI, 2 (28)
Wherein, aT, i, 3cI, 1And aT, i, 4cI, 2It is non-linear product term, introduces binary variable lI, 1, mAnd lI, 2, m, m=0,1 ..., 4, respectively indicate aT, i, 3cI, 1And aT, i, 4cI, 2:
Introduce auxiliary variable wT, i, 1, mReplace aT, i, 3lI, 1, m, auxiliary variable wT, i, 2, mReplace aT, i, 4lI, 2, m, and increase following constraint, Wherein taking M is sufficiently large positive real number:
aT, i, 3-(1-lI, 1, m)M≤wT, i, 1, m≤aT, i, 3 (31)
0≤wT, i, 1, m≤lI, 1, mM (32)
aT, i, 4-(1-lI, 2, m)M≤wT, i, 2, m≤aT, i, 4 (33)0≤wT, i, 2, m≤lI, 2, mM (34)
(4) contain in system load flow constraint and system operation constraintBy it in predicted value pointCarry out one Rank Taylor expansion, and increase constraint:
hT, ij≤(Imax)2 (38)
In formula, ΩbFor the set of branch；PT, jiThe active power of node i, Q are flowed to for t period node jT, jiFor t period node j Flow to the reactive power of node i；RjiFor the resistance of branch ji, XjiFor the reactance of branch ji；PT, iTo be injected in t period node i The sum of active power, QT, iFor the sum of the reactive power injected in t period node i；PT, ikNode k is flowed to for t period node i Active power, QT, ikThe reactive power of node k is flowed to for t period node i；ImaxThe maximum value allowed for branch current.
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