CN105811448B - A kind of the wind power direct current busbar voltage control system and method theoretical based on switching - Google Patents
A kind of the wind power direct current busbar voltage control system and method theoretical based on switching Download PDFInfo
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- CN105811448B CN105811448B CN201610327838.0A CN201610327838A CN105811448B CN 105811448 B CN105811448 B CN 105811448B CN 201610327838 A CN201610327838 A CN 201610327838A CN 105811448 B CN105811448 B CN 105811448B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses a kind of the wind power direct current busbar voltage control systems and method theoretical based on switching, including rectifier, gird-connected inverter, two-way DC/DC current transformer, controller and energy storage device, wherein, the alternating current that magneto alternator exports is converted to direct current by the rectifier, and the industrial-frequency alternating current that its inversion is constant frequency and constant voltage is sent into power grid by gird-connected inverter；The DC side of gird-connected inverter accesses blower DC side by two-way DC/DC current transformer, and energy storage device is connected in parallel on DC bus by two-way DC/DC current transformer, and working condition is permanent busbar voltage mode；Controller controls cut-offfing for two-way DC/DC current transformer.The present invention coordinates influence of each unit to busbar voltage, effectively inhibits to reduce voltge surge caused by power mismatches, improves system dynamic responding speed, guarantee system power dynamic equilibrium.
Description
Technical field
The present invention relates to a kind of the wind power direct current busbar voltage control systems and method theoretical based on switching.
Background technique
In wind generator system, when the function that power of fan changes, and generated output and energy-storage units and net side absorb
Rate mismatches, and big ups and downs will occur for DC voltage；If DC voltage fluctuates, motor side current transformer function may cause
Rate is unbalance, has an impact to grid stability.
To inhibit DC bus-bar voltage fluctuation, existing method is mostly to be connected in parallel on energy storage device directly by two-way DC/DC
It flows on bus, works in permanent busbar voltage mode.When DC bus-bar voltage increases, energy storage device is converted by two-way DC/DC
Device charging, absorbs energy；When DC bus-bar voltage decline, energy storage device is put a little by two-way DC/DC converter, discharges energy
Amount.
But constant pressure unit use traditional controller when, current perturbation variation causes voltage change, DC/DC controller voltage
Ring generates error, and due to the presence of regulating time and overshoot, electric current cannot be adjusted quickly and accurately, causes busbar voltage unstable.
So being badly in need of a reasonable control method energy for the DC/DC current transformer under the constant voltage mode of high-pressure side that works
The response time is reduced, voltage is quickly stabilized.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes a kind of wind power direct current busbar voltage control system theoretical based on switching
Energy storage dress is added by two-way DC/DC converter unit in the DC side of permanent-magnet synchronous wind-electricity integration system in system and method, the present invention
It sets, establishes buck-boost circuit model, analyze influence of the current perturbation to busbar voltage, modeled in DC/DC controller
Current perturbation feedforward is added in journey, a kind of switching law control switch is designed, so that energy storage device is rapidly and accurately to DC bus
It absorbs or releases energy, power is balanced, and DC voltage is stabilized, and when generated output variation, inhibits wind power system
The fluctuation of DC bus-bar voltage.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of wind power direct current busbar voltage control system theoretical based on switching, including it is rectifier, gird-connected inverter, two-way
DC/DC current transformer, controller and energy storage device, wherein the alternating current that the rectifier exports magneto alternator is converted
For direct current, the industrial-frequency alternating current that its inversion is constant frequency and constant voltage is sent into power grid by gird-connected inverter；
The DC side of gird-connected inverter accesses blower DC side by two-way DC/DC current transformer, and energy storage device passes through two-way
DC/DC current transformer is connected in parallel on DC bus, and working condition is permanent busbar voltage mode；
The controller controls cut-offfing for two-way DC/DC current transformer.
Further, the two-way DC/DC current transformer includes first switch tube and second switch, second switch connection
In one end of gird-connected inverter, energy storage device is connected, the first switch tube is connected in parallel on energy storage device both ends, controller triggering the
One switching tube and second switch work.
Preferably, the switching tube is insulated gate bipolar transistor.
The two-way DC/DC current transformer is connected in parallel on the DC bus of gird-connected inverter.
The controller is that PI is controlled and switched theoretical control combination.
A kind of wind power direct current busbar voltage control method theoretical based on switching, comprising the following steps:
(1) voltage, the current value for acquiring each element of permanent-magnet synchronous wind-electricity integration system in real time, based on kirchhoff electricity
Law and current law are pressed, the state variable of two-way DC/DC current transformer when next control period is calculated；
(2) according to the power expectation balance point of setting, minimum projection's method is given, determines switching law；
(3) first switch tube and second switch of two-way DC/DC current transformer are determined by projection value according to switching law
State makes two-way DC/DC current transformer work in buck or boost state, so that energy storage device is absorbed or discharged to DC bus
Energy balances power.
In the step (2), switching law is the vector field that free position can select a direction expectation balance point always.
In the step (3), when the power of magneto alternator is greater than grid-connected power, guarantee that second pipe that opens the light is led
Logical, in buck mode, energy storage device absorbs energy for two-way DC/DC current transformer work.
In the step (3), when the power of magneto alternator is less than grid-connected power, guarantee that first switch tube is led
Logical, in boost mode, energy storage device releases energy for two-way DC/DC current transformer work.
The invention has the benefit that
(1) for DC/DC current transformer modeling method without approximate processing, precision is high, can embody the feature of discrete event dynamic system
The feature of continuous time dynamic system is embodied again；
(2) PI control and switching control are combined, DC/DC current transformer can be precisely controlled, device caused by preventing because of overshoot
Cross flow problem；
(3) coordinate influence of each unit to busbar voltage, effectively inhibit to reduce voltge surge caused by power mismatches, mention
High system dynamic responding speed guarantees system power dynamic equilibrium.
Detailed description of the invention
Fig. 1 is permanent magnetism synchronous wind generating grid-connected system structural schematic diagram in the present invention；
Fig. 2 is DC/DC converter topology figure；
Fig. 3 is the control flow chart of handoff algorithms；
Fig. 4 is the calculating process figure of handoff algorithms；
Fig. 5 is the voltage and current instruction vector x of DC/DC current transformer*Generate figure；
Fig. 6 is DC/DC current transformer under boost mode, uses the DC bus-bar voltage curve graph of conventional PI control；
Fig. 7 is DC/DC current transformer under boost mode, uses the DC bus-bar voltage curve graph of the theoretical control of switching.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
Problem to be solved by this invention is, when generated output variation, to inhibit the wave of wind power system DC bus-bar voltage
It is dynamic.By a kind of wind power direct current busbar voltage stable control method theoretical based on switching, in permanent-magnet synchronous wind-electricity integration system
DC side, energy storage device is added by two-way DC/DC converter unit, establishes buck-boost circuit model, analysis disturbance electricity
The influence to busbar voltage is flowed, current perturbation feedforward is added in modeling process in DC/DC controller, designs a kind of switching law control
System switch, so that energy storage device is rapidly and accurately absorbed or released energy to DC bus, power is balanced, DC voltage
It is stabilized.
The grid-connected system of wind driven generator provided as shown in Figure 1 for embodiment of the present invention, including magneto alternator
(PMSM), generator rectifier, gird-connected inverter.The rectified device of alternating current of electrical power generators output is converted to direct current, then
Power grid is sent by the industrial-frequency alternating current that inverter inversion is constant frequency and constant voltage.It is in parallel by two-way DC/DC current transformer in DC side
Energy storage device, energy storage device access blower DC side by two-way DC/DC.As shown in Fig. 2, two-way DC/DC is by being parallel with afterflow
Two insulated gate bipolar transistors (Insulate-Gate Bipolar Transisitor, IGBT) of diode, resistance R,
Inductance L, capacitor C composition.
Two-way DC/DC current transformer high pressure terminates on DC bus, then capacitance terminal voltage is busbar voltage.High-voltage end is defeated
Enter electric current i0Electric current i is exported with low-pressure side1, flow into capacitor C.
It is as shown in Figure 3 to the optimal control process of two-way DC/DC current transformer.
According to control flow, calculation method is as shown in figure 4, specific calculating process is as follows:
Input current i0Equal to wind side currents iwindWith simultaneously current on line side igridDifference:
i0=iwind-igrid (1)
Enabling inductive current is iL, high side voltage udc, energy storage device end voltage is us, inductance value L connects with inductance
Resistance value be R, high-pressure side capacitance is C, and state variable vector isBased on Kirchhoff's second law and electric current
Law, state equation when switch S1 is closed indicate are as follows:
State equation when switch S1 is disconnected indicates are as follows:
Switching system is one by a serial continuous or discrete subsystem and coordinating between these subsystems
The hybrid system of the rule composition of switching.Above-mentioned two-way DC/DC current transformer is a kind of switching system, and formula (2) and formula (3) are respectively
Describe its subsystem under different switch states.
Minimum projection's method: for a certain switching systemσ (t, x) ∈ { 1,2...m } is to cut
Change signal.Assuming that equalization point is origin, then subsystem fσ(t,x)The projection of (x (t), u (t)) on state variable x (t) are as follows:
Γσ(t,x)(x)=xTfσ(t,x)(x(t),u(t))/||x||,x≠0 (4)
Work as Γσ(t,x)(x) when < 0, show system along vector field fσ(t,x)(x (t), u (t)) is constantly approached to equalization point.
Projection value is smaller, and the convergence rate of system is faster.
Assuming that the expectation balance point of system is x*, it is based on minimum projection's method, designs switching law:
σ (t, x)=argmin { (x-x*)TPfσ(t,x)(x(t),u(t))} (5)
For two-way DC/DC current transformer, select energy-storage travelling wave tube value as positive definite matrix P, then
Assuming that the expectation balance point of system is x*, it is based on minimum projection's method, designs switching law:
The switching law is to select a direction equalization point x always in free position*Vector field.
X (t) indicates state variable vector when current time t；If the control period is Δ T, then xi(t+ Δ T) is indicated the
Under i subsystem, it is next control moment in period t+ Δ T when state variable vector, solution procedure such as formula (8),
Difference quotient is replaced to carry out discretization with quotient's difference of state variable:
xi(t+ Δ T)=(Ai·ΔT+Ie)·x(t)+Bi·ΔT (9)
IeFor unit matrix.
Determine equalization pointurefGiven, the current instruction value i for DC voltagerefIt is controlled by voltage error through PI
Device processed generates, as shown in Figure 5.
The power for enabling generator issue is Pw, grid-connected power is Pg, work as Pw>PgWhen, S2 triggering, DC/DC works in buck mould
Formula, energy storage device absorb energy；Work as Pw<PgWhen, S1 triggering, DC/DC works in boost mode, and energy storage device releases energy.
It is emulated using MATLAB:
In 1s, wind speed changes, and wind power is reduced to 3.6kW by 14.4kW, and DC bus-bar voltage is as shown in Figure 5,6.
It by comparison of wave shape, is controlled using switching theoretical method, DC bus-bar voltage keeps stablizing, and wave is not present
It is dynamic.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (4)
1. a kind of method of the wind power direct current busbar voltage control system theoretical based on switching, based on the wind power direct current that switching is theoretical
Busbar voltage control system includes rectifier, gird-connected inverter, two-way DC/DC current transformer, controller and energy storage device, wherein
The alternating current that magneto alternator exports is converted to direct current by the rectifier, its inversion is that constant frequency is permanent by gird-connected inverter
The industrial-frequency alternating current of pressure is sent into power grid；
The DC side of gird-connected inverter is connect with the DC side of the side of two-way DC/DC current transformer and rectifier, energy storage device with
The other end of two-way DC/DC current transformer connects, and working condition is permanent busbar voltage mode；
The controller controls cut-offfing for two-way DC/DC current transformer；
It is characterized in that: the following steps are included:
(1) voltage, the current value of each element of permanent-magnet synchronous wind-electricity integration system are acquired in real time, it is fixed based on Kirchoff s voltage
Rule and current law calculate the state variable of two-way DC/DC current transformer when next control period；
(2) according to the power expectation balance point of setting, minimum projection's method is given, determines switching law；
(3) first switch tube of two-way DC/DC current transformer and the state of second switch are determined by projection value according to switching law,
Make two-way DC/DC current transformer work in buck or boost state, so that energy storage device is absorbed or is released energy to DC bus,
Balance power.
2. the method as described in claim 1, it is characterized in that: switching law is that free position can select always in the step (2)
The vector field of one direction expectation balance point.
3. the method as described in claim 1, it is characterized in that: in the step (3), when the power of magneto alternator is greater than
When grid-connected power, guarantee second switch conducting, in buck mode, energy storage device absorbs energy for two-way DC/DC current transformer work.
4. the method as described in claim 1, it is characterized in that: in the step (3), when the power of magneto alternator is less than
When grid-connected power, guarantee first switch tube conducting, in boost mode, energy storage device discharges energy for two-way DC/DC current transformer work
Amount.
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| CN102624030A (en) * | 2012-03-29 | 2012-08-01 | 东南大学 | Photovoltaic/storage battery mixed type current inverter-based distributed generation system |
| CN103812127A (en) * | 2014-02-25 | 2014-05-21 | 同济大学 | Controller and control method for voltage stabilization of wind power DC (direct current) bus based on hybrid system |
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| CN102624030A (en) * | 2012-03-29 | 2012-08-01 | 东南大学 | Photovoltaic/storage battery mixed type current inverter-based distributed generation system |
| CN103812127A (en) * | 2014-02-25 | 2014-05-21 | 同济大学 | Controller and control method for voltage stabilization of wind power DC (direct current) bus based on hybrid system |
| CN104184159A (en) * | 2014-06-28 | 2014-12-03 | 广东元景能源股份有限公司 | Co-scheduling strategy for multiple energy storage in distributed light storage micro-gird system |
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