CN106253305A  A kind of fullseparate isolated island powerless control method for distributed power source  Google Patents
A kind of fullseparate isolated island powerless control method for distributed power source Download PDFInfo
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 CN106253305A CN106253305A CN201610863663.5A CN201610863663A CN106253305A CN 106253305 A CN106253305 A CN 106253305A CN 201610863663 A CN201610863663 A CN 201610863663A CN 106253305 A CN106253305 A CN 106253305A
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Classifications

 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
 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
 H02J3/381—Dispersed generators

 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
 H02J3/388—Islanding, i.e. disconnection of local power supply from the network

 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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
 Y02E40/10—Flexible AC transmission systems [FACTS]

 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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
Abstract
The invention discloses a kind of fullseparate isolated island powerless control method for distributed power source.Distributed power source to Q V droop control, is controlled by first, second output voltage control mode simultaneously, after decoupling first, second control output voltage variable quantity, be added to obtain output voltage control amount and then carry out Control of Voltage；Distributed power source to V Q droop control, controlled by first, second target voltage control mode simultaneously, first, second control target voltage variable quantity is obtained after decoupling, it is calculated PCC point target magnitude of voltage, it is calculated idle feedforward value and idle value of feedback, is added and obtains Reactive Power Control amount and then carry out Reactive Power Control.The present invention can be applied to the reactive power of distributed power source in isolated island microcapacitance sensor and share mutual with plug and play and irrelevant information, greatly reducing complexity and the cost of system, median filter of the present invention is important role in terms of promoting microgrid dynamic property and maintaining system stability.
Description
Technical field
The present invention relates to the control method of a kind of microcapacitance sensor, especially relate to a kind of fullseparate for distributed power source
Isolated island powerless control method.
Background technology
Distributed power generation refers to be directly arranged at power distribution network or be distributed in the power generating equipment near load, it is possible to economical, high
Imitate, reliably generate electricity.Distributed electrical source position is flexible, dispersion, can be the most standby with bulk power grid, has shared defeated to a certain extent
Electrical network from power plant to user the remote and function of bulk power transmission.Although distributed power source advantages, but distributed power source
Being a uncontrollable power supply for bulk power grid, bulk power grid also tends to limit or isolation distributed power source.Big in order to coordinate
Electrical network and the contradiction of distributed power source, also been proposed the concept of microcapacitance sensor.Microcapacitance sensor be one by load and common group of micro battery
The system become, it can provide electric energy and heat simultaneously；Micro battery is responsible for energy conversion by power electronic devices, and provides required
Control；Bulk power grid is shown as single controlled cell, user is then shown as customizable power supply.
At present, microcapacitance sensor can be operated in also net state and lonely net state.Under lonely net state, distributed power source is typically adopted
Load is reasonably shared by the method for droop control.And in droop control, frequency can be relatively simply passed through in burden with power
Sagging mode distributes to each distributed power source, because the frequency change of microgrid system is continuous print in steadystate process.But
It is that, owing to each distributed power source machine terminal impedance is the most identical, the output voltage of each distributed power source is also not necessarily phase
Deng.Thus, the droop control of reactive power and voltage is difficult to obtain good effect.Situation in load or burden without work big ups and downs
Under, the voltage of PCC point is also difficult to tend towards stability rapidly.
For solving a difficult problem for the droop control of current reactive power and voltage, scholar is had to propose to introduce the general of virtual impedance
Read, weaken the impact of machine terminal impedance, but this method easily affects the quality of voltage of microgrid；Also scholar is had to pass through to microgrid
In each distributed power source inject a kind of harmonic voltage signal containing reactive power information reasonably share load or burden without work, but
It it is the distortion that is likely to cause distributed power source machine end output voltage of this method.It addition, current research is concentrated mainly on and adopts
On distributed power source with reactive powervoltage (QV) droop control, but have ignored employing voltagereactive power (VQ) sagging
The distributed power source controlled, and rarely achievement in research can solve the problem that the recovery problem of PCC point voltage when load or burden without work fluctuates.
Summary of the invention
For solving the problems referred to above, the present invention proposes a kind of idle controlling party of fullseparate isolated island for distributed power source
Method, simultaneously to using reactive powervoltage (QV) droop control and using the distribution of voltagereactive power (VQ) droop control
Formula power supply is controlled, and the reactive power being applied to distributed power source under lonely net state is shared and plug and play.
Technical scheme employing following steps:
The present invention is directed to use the distributed power source of QV droop control or use the distributed power source of VQ droop control,
Being controlled obtaining two variable quantities by two kinds of voltage control modes, two variable quantities are added or process further simultaneously
To reference value, it is applied on distributed power source carry out the control of voltage or power.
If for the distributed power source of employing QV droop control, each distributed power source is simultaneously by the first output voltage
Control mode and the second output voltage control mode are respectively controlled, more respectively by the first low pass filter and the second low pass
Wave filter decouples, and obtains the first control output voltage variable quantity V after decoupling_{pri}(Q_{i}) and the second control output voltage change
Amount V_{sec}(α,V_{PCC,cal}), use below equation to control output voltage variable quantity V by first_{pri}(Q_{i}), second control output voltage become
Change amount V_{sec}(α,V_{PCC,cal}) be added obtain output voltage reference value V_{i,ref}, and then distributed power source is carried out Control of Voltage；
V_{i,ref}=V_{pri}(Q_{i})+V_{sec}(α,V_{PCC,cal})；
If for the distributed power source of employing VQ droop control, each distributed power source passes through first object the most simultaneously
Voltage control mode and the second target voltage control mode are respectively controlled, then are carried out by the first and second low pass filters
Decoupling, obtains the first control target voltage variable quantity V after decoupling_{pri,obj}(Q_{i}) and the second control target voltage variable quantity V_{sec,obj}
(α,V_{PCC,obj}), use below equation to control target voltage variable quantity V by first_{pri,obj}(Q_{i}) and the second control target voltage change
Change amount V_{sec,obj}(α,V_{PCC,obj}) be added obtain target voltage controlled quentity controlled variable V_{i,obj}, and obtain PCC point (public company by Load flow calculation
Contact) target voltage amplitude V_{PCC,obj}；
V_{i,obj}=V_{pri,obj}(Q_{i})+V_{sec,obj}(α,V_{PCC,obj})
Then for each distributed power source, simultaneously by according to target voltage controlled quentity controlled variable V_{i,obj}Before the voltagetracing carried out
Feedback controls and according to PCC point target voltage magnitude V_{PCC,obj}The voltagetracing feedback control carried out is respectively controlled, and obtains electricity
Pressure follows the tracks of feedforward valueWith voltagetracing value of feedbackUse below equation that both additions obtain reactive power output
Reference value Q_{i,ref}, and then distributed power source is carried out the control of power:
Described first output voltage control mode uses below equation to be calculated the first control output voltage variable quantity V_{pri}
(Q_{i}):
Wherein, V^{*}For the output voltage reference value of distributed power source, Q_{i}For the reactive power output valve of distributed power source, n is
The sagging slope of standard, n_{i}It is the sagging slope of ith distributed power source, n=(V_{max}V_{min})/S_{i}, S_{i}It is regarding of distributed power source
At power capacity, V_{max}And V_{min}It is respectively the output voltage upper and lower limit of distributed power source, T_{1}It it is the time of the first low pass filter
Constant, s is frequency domain variable.
The sagging slope n of ith described distributed power source_{i}Concrete employing below equation is calculated:
Wherein, X_{i}It is the outfan reactance of ith distributed power source, X_{k}For kth platform distributed power source outfan reactance and
It is the maximum in microgrid in the outfan reactance of all distributed power sources, n_{i}It is the sagging slope of ith distributed power source, n_{k}
For kth platform distributed power source sagging slope and be the sagging slope of standard, i.e. n_{k}=n, V_{PCC,ref}For PCC point voltage reference value.
Described second output voltage control mode uses below equation to be calculated the second control output voltage variable quantity V_{sec}
(α,V_{PCC,cal}):
Wherein, α is gain coefficient, V_{PCC,cal}For PCC point virtual voltage amplitude, V_{PCC,ref}For PCC point voltage reference value, T_{2}
Being the time constant of the second low pass filter, s is frequency domain variable.
Described first object voltage control mode uses below equation to be calculated the first control target voltage variable quantity
V_{pri,obj}(Q_{i}):
Wherein, V^{*}For the output voltage reference value of distributed power source, Q_{i}For the reactive power output valve of distributed power source, n is
The sagging slope of standard, n_{i}It is the sagging slope of ith distributed power source, n=(V_{max}V_{min})/S_{i}, S_{i}It is regarding of distributed power source
At power capacity, V_{max}And V_{min}It is respectively the output voltage upper and lower limit of distributed power source, T_{1}It it is the time of the first low pass filter
Constant, s is frequency domain variable.
Described second target voltage control mode uses below equation to be calculated the second control target voltage variable quantity
V_{sec,obj}(α,V_{PCC,obj}):
Wherein, α is gain coefficient, V_{PCC,obj}For PCC point target voltage magnitude, V_{PCC,ref}For PCC point voltage reference value, T_{2}
Being the time constant of the second low pass filter, s is frequency domain variable.
The described voltagetracing feedforward uses below equation to be calculated voltagetracing feedforward value
Wherein, n is the sagging slope of standard, n=(V_{max}V_{min})/S_{i}, S_{i}It is the apparent energy capacity of distributed power source, V_{max}
And V_{min}It is respectively the output voltage upper and lower limit of distributed power source, V_{i,obj}Represent target voltage controlled quentity controlled variable.
Described voltagetracing feedback control uses below equation to be calculated voltagetracing value of feedback
Wherein, K_{P}For PI proportional component coefficient, K_{I}For PI integral element coefficient, V_{PCC,obj}Represent PCC point target voltage amplitude
Value, V_{PCC,cal}For PCC point virtual voltage amplitude.
What the present invention had has the advantages that:
The present invention can be applied to the reactive power of distributed power source in isolated island microcapacitance sensor and share and plug and play and not
Need information mutual, greatly reduce complexity and the cost of system, and PCC point can be solved when load or burden without work fluctuates
Voltage resumption problem.In the present invention, wave filter has important in terms of promoting microgrid dynamic property and maintaining system stability
Effect.
The present invention can complete nothing in local distributed power source (Distributed Generator, referred to as DG)
Merit power one secondary control, linear quadratic control, can not by Centralized Controller with communicate in the case of, System Reactive Power load is divided
Stand is to each distributed power source, and makes each distributed power source reasonably adjust machine end output voltage, and then makes PCC point electricity
Pressure tends towards stability；Two low pass filters therein are in order to decouple the dynamic characteristic of distributed power source, and improve system
Performance.
The present invention can without the help of information mutual when, be applied to use reactive powervoltage (QV) sagging control
System and the distributed power source of employing voltagereactive power (VQ) droop control, it is also possible to be extended to other application sides of microcapacitance sensor
Face.
Accompanying drawing explanation
Fig. 1 is the control method schematic diagram of the distributed power source using QV droop control in the inventive method.
Fig. 2 is the control method schematic diagram of the distributed power source using VQ droop control in the inventive method.
Fig. 3 is the distributed power source equivalent model figure in tradition droop control.
Fig. 4 is the principle schematic improving sagging Slope Method in the inventive method.
Fig. 5 is the microcapacitance sensor illustraton of model of the simulating, verifying of the present invention.
Fig. 6 (a) be the present invention simulating, verifying in microgrid reactive power load fluctuation time PCC point voltage change curve.
Fig. 6 (b) be the present invention simulating, verifying in microgrid reactive power load fluctuation time each distributed power source export idle merit
The change curve of rate.
Fig. 7 (a) be the present invention simulating, verifying in PCC point voltage reference value change time PCC point voltage change curve
Fig. 7 (b) be the present invention simulating, verifying in PCC point voltage reference value change time each distributed power source output nothing
The change curve of merit power
Fig. 8 (a) be the present invention simulating, verifying in switching distributed power source DG2 time PCC point voltage change curve
Fig. 8 (b) be the present invention simulating, verifying in switching distributed power source DG2 time each distributed power source output idle
The change curve of power
In figure: the DG1 in all figures, DG2, DG3, DG4 are four distributed power sources of same group.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the present invention is described in further detail by specific embodiment.
The inventive method uses different idle control modes to carry out for the distributed power source of two kinds of different droop controls.
1) as it is shown in figure 1, for using the distributed power source of QV droop control, each distributed power source is simultaneously by the
One output voltage control mode, the second output voltage control mode are controlled, and respectively obtain the first control output voltage change
Amount V_{pri}(Q_{i}), second control output voltage variable quantity V_{sec}(α,V_{PCC,cal}), and solved by the first and second low pass filters
Coupling；Formula is used to control output voltage variable quantity V by first_{pri}(Q_{i}), second control output voltage variable quantity V_{sec}(α,V_{PCC,cal})
Addition obtains output voltage reference value V_{i,ref}, and then distributed power source is carried out Control of Voltage；
V_{i,ref}=V_{pri}(Q_{i})+V_{sec}(α,V_{PCC,cal})
Step 1) in the first output voltage control mode use below equation be calculated first control output voltage become
Change amount V_{pri}(Q_{i}):
Wherein, V^{*}For the output voltage reference value of distributed power source, V_{max}And V_{min}It is respectively the output electricity of distributed power source
Pressure upper and lower limit, S_{i}It is the apparent energy capacity of distributed power source, Q_{i}For the reactive power output valve of distributed power source, n is standard
Sagging slope, n=(V_{max}V_{min})/S_{i}, T_{1}Being the time constant of the first low pass filter, s is frequency domain variable.
First controls output voltage variable quantity V_{pri}In n_{i}Employing below equation is calculated:
Wherein, X_{i}It is the outfan reactance of ith distributed power source, X_{k}For kth platform distributed power source outfan reactance and
It is the maximum in microgrid in the outfan reactance of all distributed power sources, n_{i}It is the sagging slope of ith distributed power source, n_{k}
For kth platform distributed power source sagging slope and be standard sagging slope (i.e. n_{k}=n), V_{PCC,ref}Voltage Reference for PCC point
Value.
Second output voltage control mode uses below equation to be calculated the second control output voltage variable quantity V_{sec}(α,
V_{PCC,cal}):
Wherein, α is gain coefficient, V_{PCC,cal}For PCC point virtual voltage amplitude, T_{2}The time being the second low pass filter is normal
Number, s is frequency domain variable.
2) as in figure 2 it is shown, for using the distributed power source of VQ droop control, each distributed power source first passes through the
One target voltage control mode, the second target voltage control mode are controlled, and respectively obtain the first control target voltage change
Amount V_{pri,obj}(Q_{i}), second control target voltage variable quantity V_{sec,obj}(α,V_{PCC,obj}), and by the first and second low pass filters
Decouple；By V_{pri,obj}(Q_{i}) and V_{sec,obj}(α,V_{PCC,obj}) be added obtain target voltage controlled quentity controlled variable V_{i,obj}, and by trend meter
Calculation obtains PCC point target voltage magnitude V_{PCC,obj}；Then each distributed power source is simultaneously by the voltagetracing feedforward and electricity
Pressure is followed the tracks of feedback control and is controlled, and respectively obtains voltagetracing feedforward valueWith voltagetracing value of feedbackAnd by two
Person is added reference value Q obtaining reactive power output_{i,ref}, and then distributed power source is controlled.Abovementioned relation equation below
Represent.
First object voltage control mode uses below equation to be calculated the first control target voltage variable quantity V_{pri,obj}
(Q_{i}):
Wherein, first controls target voltage variable quantity V_{pri,obj}(Q_{i}) control output voltage variable quantity V with first_{pri}(Q_{i}) meter
Calculation method is identical, and parameter meaning is the most identical.
Second target voltage control mode uses below equation to be calculated the second control target voltage variable quantity V_{sec,obj}
(α,V_{PCC,obj}):
Wherein, α is gain coefficient, V_{PCC,obj}For PCC point target voltage magnitude, T_{2}The time being the second low pass filter is normal
Number, s is frequency domain variable.
The voltagetracing feedforward uses below equation to be calculated voltagetracing feedforward value
Voltagetracing feedback control uses below equation to be calculated voltagetracing value of feedback
Wherein, K_{P}For PI proportional component coefficient, K_{I}For PI integral element coefficient.
The present invention designs for distributed power source (DG) all of in microcapacitance sensor, and each distributed power source (DG) has
Corresponding control method.Each distributed power source is all carried out by an integrated local control method.The present invention is mainly by two
Individual part forms: for the control of distributed power source sagging for employing QV, for the control using distributed power source sagging for VQ
System.Processed by decoupling, microgrid system dynamic characteristic be similar when using traditional droop control method, therefore adopt
By the system after control of the present invention, there is preferable stable state and dynamic property.
The design principle of the present invention is as follows:
In tradition droop control, the equivalent model figure of distributed power source is as shown in Figure 3.Wherein, L_{f,i}And C_{f,i}It it is ith
The inductance of the LC wave filter of distributed power source and capacitance parameter, L_{feeder,i}It is the feeder line inductance of ith distributed power source, L_{T,i}It is
Ith distributed power source connected transformator T_{i}Internal inductance, V_{i}∠δ_{i}It is the set end voltage of ith distributed power source, V_{PCC}
∠ 0 ° is the voltage of PCC point.Line impedance owing to line resistance is negligible, between ith distributed power source and PCC point
X_{i}Can represent by below equation:
X_{i}=X_{feeder,i}+X_{T,i}=ω (L_{feeder.i}+L_{T,i})
Wherein, X_{feeder,i}Represent the feeder line reactance between ith distributed power source and PCC point, X_{T,i}Represent ith distributed
The inside reactance of connected transformator between power supply and PCC point.
Tradition droop control then can represent by below equation:
Wherein, ω_{i}It is the output angle frequency of ith distributed power source, V_{i}It it is the set end voltage width of ith distributed power source
Value, ω^{*}And V^{*}It is respectively angular frequency and the reference value of set end voltage amplitude, P_{i}It it is the output wattful power of ith distributed power source
Rate, Q_{i}It is the output reactive power of ith distributed power source, m_{i}It is the meritorious sagging coefficient of ith distributed power source, n_{i}It is ith
The idle sagging coefficient of platform distributed power source.
It addition, as it is shown on figure 3, set end voltage amplitude V of ith distributed power source_{i}Can be by PCC point voltage amplitude V_{PCC}Meter
Obtain:
In conjunction with both the above formula, the calculation of the output reactive power of available ith distributed power source:
When microgrid has two distributed power source DG1 and DG2, and the equal S of apparent energy capacity of distributed power source_{1}=
S_{2}, then the difference of two distributed power source output reactive powers is:
To make the difference of two distributed power source output reactive powers be zero i.e. Δ Q_{err}=0, then it must is fulfilled for:
When two distributed power sources that apparent energy is identical use tradition droop control, if each distributed power source is defeated
Go out reactive power equal, then control effect best；But as shown from the above formula, when each distributed power source feeder line inductance not
Meanwhile, output reactive power also can be unequal.The inventive method reduces the difference of two distributed power source output reactive powers
Principle as shown in Figure 4: assume X_{1}>X_{2}, increase the idle sagging coefficient n of DG2_{2}Can reduce by two distributed power source output nothings
The difference of merit power.
The specific embodiment of the present invention is as follows:
Setting up a typical isolated island exchange microcapacitance sensor in Matlab/Simulink software, microcapacitance sensor includes four 1MW
Distributed generator (DG1, DG2, DG3, DG4), a firm demand and two variable loads, as shown in Figure 5.Wherein, DG1
Use QV droop control with DG2, and DG3 and DG4 uses VQ droop control.Other parameters of system are as shown in Fig. 5 and Biao 1:
Table 1 components of system as directed parameter value
In simulated example, devise three kinds of operating modes and carry out simulating, verifying:
(1) initial load or burden without work be 1.2MVar, PCC point voltage reference value be 0.91p.u..As t=20s, system is total
Load or burden without work rises to 1.5MVar；Working as t=30s, the total load or burden without work of system rises to 1.8Mvar.Emulating image is as shown in Figure 6.
PCC point voltage change curve when Fig. 6 (a) is microgrid reactive power load fluctuation, Fig. 6 (b) is microgrid reactive power load fluctuation
Time each distributed power source output reactive power change curve.From Fig. 6 (a), when System Reactive Power load rises, PCC
Point voltage amplitude has a transient process the shortest, and promptly converges to PCC point voltage reference value.Whole transient process
Voltage magnitude deviation is less than 0.001p.u..And from Fig. 6 (b), when load or burden without work fluctuates, the inventive method can make
The deviation of the output reactive power of each distributed power source is reduced to zero.
(2) initial load or burden without work is 1.2MVar, works as t=25s, PCC point voltage reference value and is risen to by 0.91p.u.
0.95p.u..According to formula (4), the idle sagging coefficient of four distributed power sources changes the most accordingly, parameter value such as table 2 institute
Show.Emulating image is as shown in Figure 7.
Table 2V_{PCC,ref}The idle sagging coefficient of each distributed power source when=0.95
Parameter  Numerical value 
The idle sagging coefficient n of DG1_{1}  0.2 
The idle sagging coefficient n of DG2_{2}  0.367 
The idle sagging coefficient n of DG3_{3}  0.326 
The idle sagging coefficient n of DG4_{4}  0.262 
Fig. 7 (a) is the PCC point voltage change curve during change of PCC point voltage reference value, and Fig. 7 (b) is PCC point voltage ginseng
Examine the change curve of each distributed power source output reactive power during value change.From Fig. 7 (a), when PCC point voltage reference
When value rises to 0.95p.u., PCC point voltage amplitude can converge to rapidly new voltage reference value and voltage magnitude deviation
Less than 0.001p.u..And in Fig. 7 (b), the output reactive power of each distributed power source can be along with voltage reference value
Change is reacted rapidly, and converges on same reactive power value.
(3) initial load or burden without work be 1.2MVar, PCC point voltage reference value be 0.91p.u..As t=15s, DG2 exits
Microgrid system；As t=44s, DG2 again puts into microgrid system and runs.Emulating image is as shown in Figure 8.
Fig. 8 (a) is PCC point voltage change curve during switching distributed power source DG2, and Fig. 8 (b) is switching distributed power source
The change curve of each distributed power source output reactive power during DG2.In Fig. 8 (a), when DG2 exits microgrid system,
PCC point voltage amplitude has a transient process the shortest, and promptly converges to PCC point voltage reference value.And by Fig. 8 (b)
Understanding, after DG2 exits microgrid system, the output reactive power of other three distributed power sources can rise rapidly and all converge on
New steadystate value, the output reactive power of DG2 declines the most rapidly and also can restrain and keep stable；And when DG2 throws again
After entering microgrid system operation, the output reactive power of four distributed power sources can promptly converge on again DG2 and exit microgrid system
Steadystate value before system.
It must be noted that the new type of control method that the present invention proposes disclosure satisfy that employing QV droop control and uses VQ
The control requirement of the distributed power source of droop control.In the case of not communication and central control system, the control of the present invention
Method can preferably solve microgrid reactive power load and share out equally and PCC point voltage recovery problem, makes system stable operation.The present invention
Control method make system have preferable stable state and dynamic property, be a feasible control method.
Abovementioned detailed description of the invention is used for illustrating the present invention rather than limiting the invention, the present invention's
In spirit and scope of the claims, any modifications and changes that the present invention is made, both fall within the protection model of the present invention
Enclose.
Claims (8)
1. the fullseparate isolated island powerless control method for distributed power source, it is characterised in that comprise the following steps:
If for the distributed power source of employing QV droop control, each distributed power source is simultaneously by the first output voltage control
Mode and the second output voltage control mode are respectively controlled, more respectively by the first low pass filter and the second lowpass filtering
Device decouples, and obtains the first control output voltage variable quantity V after decoupling_{pri}(Q_{i}) and the second control output voltage variable quantity V_{sec}
(α,V_{PCC,cal}), use below equation to control output voltage variable quantity V by first_{pri}(Q_{i}), second control output voltage variable quantity
V_{sec}(α,V_{PCC,cal}) be added obtain output voltage reference value V_{i,ref}, and then distributed power source is carried out Control of Voltage；
V_{i,ref}=V_{pri}(Q_{i})+V_{sec}(α,V_{PCC,cal})；
If for the distributed power source of employing VQ droop control, each distributed power source is the most simultaneously by first object voltage
Control mode and the second target voltage control mode are respectively controlled, then are solved by the first and second low pass filters
Coupling, obtains the first control target voltage variable quantity V after decoupling_{pri,obj}(Q_{i}) and the second control target voltage variable quantity V_{sec,obj}(α,
V_{PCC,obj}), use below equation to control target voltage variable quantity V by first_{pri,obj}(Q_{i}) and the second control target voltage variable quantity
V_{sec,obj}(α,V_{PCC,obj}) be added obtain target voltage controlled quentity controlled variable V_{i,obj}, and obtain PCC point target voltage amplitude by Load flow calculation
Value V_{PCC,obj}；
V_{i,obj}=V_{pri,obj}(Q_{i})+V_{sec,obj}(α,V_{PCC,obj})
Then for each distributed power source, simultaneously by according to target voltage controlled quentity controlled variable V_{i,obj}The voltagetracing feedforward control carried out
Make and according to PCC point target voltage magnitude V_{PCC,obj}The voltagetracing feedback control carried out is respectively controlled, obtain voltage with
Track feedforward valueWith voltagetracing value of feedbackUse below equation that both additions obtain the ginseng of reactive power output
Examine value Q_{i,ref}, and then distributed power source is carried out the control of power:
A kind of fullseparate isolated island powerless control method for distributed power source the most according to claim 1, its feature
It is: described first output voltage control mode uses below equation to be calculated the first control output voltage variable quantity V_{pri}
(Q_{i}):
Wherein, V^{*}For the output voltage reference value of distributed power source, Q_{i}For the reactive power output valve of distributed power source, n is standard
Sagging slope, n_{i}It is the sagging slope of ith distributed power source, n=(V_{max}V_{min})/S_{i}, S_{i}It it is the apparent merit of distributed power source
Rate capacity, V_{max}And V_{min}It is respectively the output voltage upper and lower limit of distributed power source, T_{1}The time being the first low pass filter is normal
Number, s is frequency domain variable.
A kind of fullseparate isolated island powerless control method for distributed power source the most according to claim 2, its feature
It is: the sagging slope n of ith described distributed power source_{i}Concrete employing below equation is calculated:
Wherein, X_{i}It is the outfan reactance of ith distributed power source, X_{k}For kth platform distributed power source outfan reactance and be micro
Maximum in the outfan reactance of all distributed power sources, n in net_{i}It is the sagging slope of ith distributed power source, n_{k}For kth
The sagging slope of platform distributed power source and be the sagging slope of standard, i.e. n_{k}=n, V_{PCC,ref}For PCC point voltage reference value.
A kind of fullseparate isolated island powerless control method for distributed power source the most according to claim 1, its feature
It is: described second output voltage control mode uses below equation to be calculated the second control output voltage variable quantity V_{sec}(α,
V_{PCC,cal}):
Wherein, α is gain coefficient, V_{PCC,cal}For PCC point virtual voltage amplitude, V_{PCC,ref}For PCC point voltage reference value, T_{2}It is
The time constant of two low pass filters, s is frequency domain variable.
A kind of fullseparate isolated island powerless control method for distributed power source the most according to claim 1, its feature
It is: described first object voltage control mode uses below equation to be calculated the first control target voltage variable quantity V_{pri,obj}
(Q_{i}):
Wherein, V^{*}For the output voltage reference value of distributed power source, Q_{i}For the reactive power output valve of distributed power source, n is standard
Sagging slope, n_{i}It is the sagging slope of ith distributed power source, n=(V_{max}V_{min})/S_{i}, S_{i}It it is the apparent merit of distributed power source
Rate capacity, V_{max}And V_{min}It is respectively the output voltage upper and lower limit of distributed power source, T_{1}The time being the first low pass filter is normal
Number, s is frequency domain variable.
A kind of fullseparate isolated island powerless control method for distributed power source the most according to claim 1, its feature
It is: described second target voltage control mode uses below equation to be calculated the second control target voltage variable quantity V_{sec,obj}
(α,V_{PCC,obj}):
Wherein, α is gain coefficient, V_{PCC,obj}For PCC point target voltage magnitude, V_{PCC,ref}For PCC point voltage reference value, T_{2}It is
The time constant of two low pass filters, s is frequency domain variable.
A kind of fullseparate isolated island powerless control method for distributed power source the most according to claim 1, its feature
It is: the described voltagetracing feedforward uses below equation to be calculated voltagetracing feedforward value
Wherein, n is the sagging slope of standard, n=(V_{max}V_{min})/S_{i}, S_{i}It is the apparent energy capacity of distributed power source, V_{max}And V_{min}
It is respectively the output voltage upper and lower limit of distributed power source, V_{i,obj}Represent target voltage controlled quentity controlled variable.
A kind of fullseparate isolated island powerless control method for distributed power source the most according to claim 1, its feature
It is: described voltagetracing feedback control uses below equation to be calculated voltagetracing value of feedback
Wherein, K_{P}For PI proportional component coefficient, K_{I}For PI integral element coefficient, V_{PCC,obj}Represent PCC point target voltage magnitude,
V_{PCC,cal}For PCC point virtual voltage amplitude.
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CN111049154A (en) *  20191128  20200421  广东电网有限责任公司  Emergency power supply networking reactive voltage coordination control method and related device 
CN111864797A (en) *  20200722  20201030  杭州电子科技大学  Island microgrid secondary voltage adjusting method based on twodimensional control 
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CN103414207A (en) *  20130715  20131127  中国科学院电工研究所  Droop controlbased smooth switching method 

2016
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CN103414207A (en) *  20130715  20131127  中国科学院电工研究所  Droop controlbased smooth switching method 
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赵睿: "一种微网孤岛运行的分层/分散自趋优控制策略研究", 《CNKI中国优秀硕士学位论文全文数据库》 * 
Cited By (2)
Publication number  Priority date  Publication date  Assignee  Title 

CN111049154A (en) *  20191128  20200421  广东电网有限责任公司  Emergency power supply networking reactive voltage coordination control method and related device 
CN111864797A (en) *  20200722  20201030  杭州电子科技大学  Island microgrid secondary voltage adjusting method based on twodimensional control 
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