CN110021941A - A kind of control method for the Power Systems fluctuation inhibiting the field containing double-fed fan motor - Google Patents
A kind of control method for the Power Systems fluctuation inhibiting the field containing double-fed fan motor Download PDFInfo
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- CN110021941A CN110021941A CN201910299686.1A CN201910299686A CN110021941A CN 110021941 A CN110021941 A CN 110021941A CN 201910299686 A CN201910299686 A CN 201910299686A CN 110021941 A CN110021941 A CN 110021941A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- 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 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
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to the technical field of power systems of field containing double-fed fan motor, specially a kind of control method for the Power Systems fluctuation for inhibiting the field containing double-fed fan motor, SMES superconducting magnetic energy storage is installed at the outlet bus of wind power plant, the balance of grid-connected place's electric flux is maintained by absorbing or releasing energy using SMES, reduce influence of the disturbance to power grid as caused by wind-powered electricity generation uncertainty, to achieve the purpose that inhibit the fluctuation of the Power Systems of field containing double-fed fan motor, SMES can store energy but also quick release of energy simultaneously, and there is quick electromagnetic response characteristic and very high energy storage efficiency, in addition SMES storage is electromagnetic energy, the energy conversion of other forms is not needed, therefore it can be long-term, it stores without loss, there are also adjust simultaneously, the advantages that easy to maintain and pollution-free, it is to inhibit field containing double-fed fan motor The optimal selection of power swing.
Description
Technical field
The present invention relates to the technical field of power systems of field containing double-fed fan motor, specially a kind of electricity for inhibiting the field containing double-fed fan motor
The control method of Force system power swing.
Background technique
In recent years, fast-developing for the new energy power generation technology of representative with wind-powered electricity generation etc., more and more Large Scale Wind Farm Integration accesses
Electric system.The motive power of wind-driven generator is wind, the stochastic volatility of wind and the intermittent output for determining wind-driven generator
Characteristic is also fluctuation and interval.With the access of large-scale wind power field, shared capacity increases wind-powered electricity generation capacity in the power system,
Influence of the output of wind electric field uncertainty to electric system cannot be ignored.
With the continuous improvement of China's Power System Interconnection degree, so that being easier to that power occurs on remote heavy load transmission line of electricity
Fluctuation.In addition, the new-energy grid-connecteds such as wind-powered electricity generation also make power grid to the impact of power grid and the application of fast high-gain field regulator
Power swing phenomenon take place frequently, may cause large-area power-cuts when serious, cause huge economic losses.Therefore, power waves are solved
Dynamic problem has become one of important topic of power network safety operation.
Today's society is higher and higher to power quality and security reliability requirement, due to the electric load in Large Scale Interconnected Systems
With the sustainable growth of mapping of field power, in the case where tradition concentrates transmission & distribution power mode, remote large capacity conveys electric energy, and oneself can not be kept away
Exempt from, system stability and safety is so just caused to reduce, power quality decline.Research shows that being sent out in existing wind-force containing double-fed
SMES is introduced in electric system, is capable of the conveying of quickly and effectively regulator control system active reactive, and wind-power electricity generation uncertainty is inhibited to draw
The power swing risen improves system stability, safety, improves power quality.
Summary of the invention
The purpose of the present invention is provide a kind of electric system for inhibiting the field containing double-fed fan motor to overcome above-mentioned technical deficiency
The control method of power swing installs SMES superconducting magnetic energy storage at the outlet bus of wind power plant, by being inhaled using SMES
It receives or releases energy to maintain the balance of grid-connected place's electric flux, reduce the disturbance as caused by wind-powered electricity generation uncertainty to power grid
It influences, to achieve the purpose that inhibit the fluctuation of the Power Systems of field containing double-fed fan motor.The SMES super conductive magnetic storage energy has energy
It is big to measure storage density, fast response time, the advantage of service life length.
In order to realize the purpose, the specific embodiment that the present invention uses is as follows:
A kind of control method for the Power Systems fluctuation inhibiting the field containing double-fed fan motor, which is characterized in that including following
Step:
1) SMES superconducting magnetic energy storage is installed at the outlet bus of the field containing double-fed wind generating；
2) active and Reactive Power Control amount at the outlet of field containing double-fed fan motor bus is detected according to Instantaneous Power Theory；
3) desired value that the point controls power is generated by power controller transmission function；
4) poor by making to desired value and detected value, obtain amount to be compensated；
5) it is controlled by discretization state feedback decoupling, so that the power holding one that SMES is output to AC system side is steady
Definite value realizes the purpose for inhibiting the Power Systems fluctuation of the field containing double-fed fan motor.
SMES is again returned to electromagnetic energy when needing by being stored electromagnetic energy using superconducting magnet in the step 1)
Power grid or other loads, energy W is stored in superconducting magnet are as follows:
L in formulaSMESIt is the inductance value of magnet；It is the current value on magnet；
The output quantity of SMES is active power and reactive power, by these active power and reactive power with exchange side system
It swaps, mathematical model is as follows:
In formula, PEnergy storageIt is the active power value of SMES output；QEnergy storageIt is the reactive power value of SMES output；KPIt is SMES active
The gain coefficient of power response；KQIt is the gain coefficient of SMES reactive power response；TPIt is SMES active power response delay system
Number；TQIt is SMES reactive power response delay coefficient；
When power fluctuates at the outlet of field containing double-fed fan motor bus, being mounted on the SMES at this will be by absorbing or sending out
Power balances the power at the point out, and disappear its fluctuation, makes it stable, and practical flow direction loads active after SMES is compensated
Power and reactive power are as follows:
PPower grid=PAt bus-PEnergy storage
QPower grid=QAt bus-QEnergy storage。
Discretization state feedback decoupling control in the step 5) uses discretization method, i.e., designs in Disgrete Time Domain
State feedback decoupling controller, not only can be with the dynamic response characteristic of Guarantee control system, but also simplified control system designs, easily
Relationship between Project Realization, the input and output of system are as follows:
Y in formularIt is reference input；TsIt is the sampling period.
The beneficial effects of the present invention are: SMES used in the present invention is as flexibly controllable power source, in wind containing double-fed
Electric field not only can actively cause surely, for inhibit power swing have good effect, and improve power grid stability and
Reliability, while SMES can store energy but also quick release of energy, and have quick electromagnetic response characteristic and very high storage
Energy efficiency, in addition SMES storage is electromagnetic energy, does not need the energy conversion of other forms, therefore can be stored for a long time, without loss,
It is the optimal selection for inhibiting the power swing of field containing double-fed fan motor simultaneously there are also adjusting, being easy to maintain and pollution-free.
Detailed description of the invention
Fig. 1 is that the grid entry point of field containing double-fed fan motor of the invention configures SMES system diagram.
Fig. 2 is energy-storage system basic structure of the present invention composition.
Specific embodiment
Structure of the invention and its advantages are further illustrated below in conjunction with attached drawing 1-2.
A kind of control method of the Power Systems fluctuation of inhibition field containing double-fed fan motor as described in Fig. 1-2, including with
Lower step:
1) SMES superconducting magnetic energy storage is installed at the outlet bus of the field containing double-fed wind generating, by inhaling using SMES
It receives or releases energy to maintain the balance of grid-connected place's electric flux, reduce the disturbance as caused by wind-powered electricity generation uncertainty to power grid
It influences, to achieve the purpose that inhibit the fluctuation of the Power Systems of field containing double-fed fan motor；
2) active and Reactive Power Control amount at the outlet of field containing double-fed fan motor bus is detected according to Instantaneous Power Theory；
3) desired value that the point controls power is generated by power controller transmission function；
4) poor by making to desired value and detected value, obtain amount to be compensated；
5) it is controlled by discretization state feedback decoupling, so that the power holding one that SMES is output to AC system side is steady
Definite value realizes the purpose for inhibiting the Power Systems fluctuation of the field containing double-fed fan motor.
Discretization state feedback decoupling control in the step 5) is analyzed as follows:
Discretization method not only can be with Guarantee control system that is, in Disgrete Time Domain design point feedback decoupling controller
Dynamic response characteristic, and simplified control system designs, and is easy to Project Realization, makes a concrete analysis of as follows:
Assuming that the mathematical model of current transformer can be indicated with state equation are as follows:
Y=Cx (1-1)
The design of controller can indicate are as follows:
U=Kx+Hyr+Me (1-2)
K is state feedback decoupling matrix in formula；yrIt is reference input；H is the constant coefficient diagonal matrix gain of reference input；
M is the constant coefficient gain matrix of disturbance input；
Thus, the relationship between input variable and output variable may be expressed as:
Y (s)=C (sI-A-BK)-1[BHyr(s)+(BM+F)e(s)] (1-3)
For the decoupling control for realizing system, some elements in matrix K should be chosen first to meet Matrix C (sI-A-BK)-1
For this condition of diagonal matrix, then, the selection of other elements can be on the basis of considering system zero pole point arrangement in matrix K
It carries out, after matrix K is found out, the selection of matrix H makes system obtain unit steady-state gain.And the design of matrix M must satisfy two
Condition, first is that output variable y is not influenced in steady-state process by disturbance input；Second is that transient process is as short as possible.From above-mentioned
As can be seen that the design of state feedback decoupling control matrix K is extremely important to the design of entire controller in analysis, to examine simultaneously
The arrangement of worry system and zero pole point, and design process with the increase of state variable it is relatively complicated.
Using the method for discretization, the state equation of system can be converted to the expression formula of Disgrete Time Domain, it is assumed that formula (1-
1) state equation indicated is first-order system, and when the sampling period is sufficiently small, it can be indicated are as follows:
X (k+1)=(TsA+1)x(k)+TsBu(k)+TsFe(k)
Y (k)=Cx (k) (1-4)
In formula, TsIt is the sampling period, usually less than 1/10th of system minimum time constant.
Formula (1-4) can be organized into:
In above formula, using y (k+1) as reference input yref, to obtain:
For wushu (1-6) compared with formula (1-3), the parameter of available controller is as follows:
Thus, the closed loop relationship between system input and output can indicate are as follows:
And matrix (BM+F)=0, illustrate that disturbance input there is no influence in stable state.Thus, discretization state
The design of feedback decoupling control method is very intuitive, in addition, it is specific not to be directed to system using the design that this method carries out controller
Operating point, so that the robustness of controller is improved.
In the present invention, according to the power output for needing to control SMES of system, signal acquisition part sorting surveys electric system
And the various technology parameters of SMES, and basic electric data is provided and carries out POWER SYSTEM STATE analysis to controller
Electromagnetic energy is returned to power grid again when needing or other is born by SMES by being stored electromagnetic energy using superconducting magnet
It carries.Energy W is stored in superconducting magnet to be expressed from the next:
L in formulaSMESIt is the inductance value of magnet；It is the current value on magnet.
The output quantity of SMES is active power and reactive power, by these active power and reactive power with exchange side system
It swaps, mathematical model is as follows:
In formula, PEnergy storageIt is the active power value of SMES output；QEnergy storageIt is the reactive power value of SMES output；KPIt is SMES active
The gain coefficient of power response；KQIt is the gain coefficient of SMES reactive power response；TPIt is SMES active power response delay system
Number；TQIt is SMES reactive power response delay coefficient.
SMES work includes four modes:
SMES energy: being remained to the armed state of rated value En by energy storage mode, when starting to work, if energy in SMES
E < Emin is measured, SMES starts energy storage.Inverter and chopper, which cooperate, at this time carries out energy storage to energy storage inductor.
Release mode: situation is needed according to power grid and as SMES reserves E > EMAXWhen, SMES starts to release energy.
Holding mode: also referred to as freewheeling mode, i.e., when SMES is not involved in Power Exchange, the energy that is ideally stored in SMES
Amount remains unchanged.
Switch mode: the phase controller issues instruction, and current transformer is realized with chopper cooperation exchanges side power grid and SMES
Intercourse active power and reactive power.It is required that EMIN< ESMES< EMAX.If EMIN> ESMES, SMES is switched to energy storage state；
If EMAX> ESMES, SMES is switched to release conditions.
When power fluctuates at the outlet of field containing double-fed fan motor bus, being mounted on the SMES at this will be by absorbing or sending out
Power balances the power at the point out, and disappear its fluctuation, makes it stable, and practical flow direction loads active after SMES is compensated
Power and reactive power are as follows:
PPower grid=PAt bus-PEnergy storage
QPower grid=QAt bus-QEnergy storage (1-11)
The advantages and positive effects of the present invention are: SMES used in the present invention is as flexibly controllable power source,
Field containing double-fed fan motor not only can actively cause surely, for inhibiting power swing to have good effect, and to improve power grid
Stability and reliability, while SMES can store energy but also quick release of energy, and have quick electromagnetic response characteristic and
Very high energy storage efficiency (charge/discharge efficiency is more than 95%), in addition SMES storage is electromagnetic energy, does not need the energy of other forms
Amount conversion, therefore can store for a long time, without loss, while there are also adjusting, being easy to maintain and pollution-free, inhibited containing double
Present the optimal selection of wind power fluctuation.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of control method for the Power Systems fluctuation for inhibiting the field containing double-fed fan motor, which is characterized in that including following step
It is rapid:
1) SMES superconducting magnetic energy storage is installed at the outlet bus of the field containing double-fed wind generating；
2) active and Reactive Power Control amount at the outlet of field containing double-fed fan motor bus is detected according to Instantaneous Power Theory；
3) desired value that the point controls power is generated by power controller transmission function；
4) poor by making to desired value and detected value, obtain amount to be compensated；
5) it is controlled by discretization state feedback decoupling, so that the power that SMES is output to AC system side keeps a stabilization
Value realizes the purpose for inhibiting the Power Systems fluctuation of the field containing double-fed fan motor.
2. a kind of control method of Power Systems fluctuation for inhibiting the field containing double-fed fan motor according to claim 1,
Be characterized in that: SMES is again returned electromagnetic energy when needing by being stored electromagnetic energy using superconducting magnet in the step 1)
Telegram in reply net or other loads, energy W is stored in superconducting magnet are as follows:
L in formulaSMESIt is the inductance value of magnet；It is the current value on magnet；
The output quantity of SMES is active power and reactive power, these active power and reactive power are carried out with side system is exchanged
Exchange, mathematical model are as follows:
In formula, PEnergy storageIt is the active power value of SMES output；QEnergy storageIt is the reactive power value of SMES output；KPIt is SMES active power
The gain coefficient of response；KQIt is the gain coefficient of SMES reactive power response；TPIt is SMES active power response delay coefficient；TQ
It is SMES reactive power response delay coefficient；
When power fluctuates at the outlet of field containing double-fed fan motor bus, being mounted on the SMES at this will be by absorbing or issuing function
Rate balances the power at the point, and disappear its fluctuation, makes it stable, the active power that practical flow direction loads after SMES is compensated
And reactive power are as follows:
PPower grid=PAt bus-PEnergy storage
QPower grid=QAt bus-QEnergy storage。
3. a kind of control method of Power Systems fluctuation for inhibiting the field containing double-fed fan motor according to claim 1,
Be characterized in that: the discretization state feedback decoupling control in the step 5) is set using discretization method in Disgrete Time Domain
State feedback decoupling controller is counted, not only can be with the dynamic response characteristic of Guarantee control system, and also simplified control system designs,
It is easy to Project Realization, the relationship between the input and output of system are as follows:
Y in formularIt is reference input；TsIt is the sampling period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910299686.1A CN110021941A (en) | 2019-04-15 | 2019-04-15 | A kind of control method for the Power Systems fluctuation inhibiting the field containing double-fed fan motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910299686.1A CN110021941A (en) | 2019-04-15 | 2019-04-15 | A kind of control method for the Power Systems fluctuation inhibiting the field containing double-fed fan motor |
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| CN110021941A true CN110021941A (en) | 2019-07-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113708384A (en) * | 2021-03-15 | 2021-11-26 | 北京建筑大学 | Wind power network access damping control method and device based on state feedback decoupling control |
-
2019
- 2019-04-15 CN CN201910299686.1A patent/CN110021941A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113708384A (en) * | 2021-03-15 | 2021-11-26 | 北京建筑大学 | Wind power network access damping control method and device based on state feedback decoupling control |
| CN113708384B (en) * | 2021-03-15 | 2023-10-27 | 北京建筑大学 | Wind power network access damping control method and device based on state feedback decoupling control |
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