CN206332461U - A kind of micro-grid connection control device based on back-to-back converter - Google Patents
A kind of micro-grid connection control device based on back-to-back converter Download PDFInfo
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- CN206332461U CN206332461U CN201621252367.3U CN201621252367U CN206332461U CN 206332461 U CN206332461 U CN 206332461U CN 201621252367 U CN201621252367 U CN 201621252367U CN 206332461 U CN206332461 U CN 206332461U
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
Abstract
A kind of micro-grid connection control device based on back-to-back converter, including back-to-back converter, DC bus capacitance C0, LCL filter.The back-to-back converter includes：Active rectifier VSC1 positioned at bulk power grid side, the inverter VSC2 positioned at micro-capacitance sensor side；The back-to-back converter connection DC bus capacitance C0.Active rectifier VSC1 is connected with inverter VSC2 by dc bus.Bulk power grid connects back-to-back converter by the first LCL filter, and back-to-back converter connects micro-capacitance sensor by the second LCL filter.The back-to-back converter connects V/F control loops, PQ control loops or DC bus-bar voltage control loop.A kind of micro-grid connection control device based on back-to-back converter of the utility model, the device utilizes the working characteristics of back-to-back converter, with reference to two kinds of control methods, realizes the rapid combination of bulk power grid and micro-capacitance sensor.
Description
Technical field
The utility model belongs to micro-grid connection and operation control technology field, and in particular to one kind is based on back-to-back unsteady flow
The micro-grid connection control device of device.
Background technology
Micro-capacitance sensor is gradually as the substitute of traditional centralized power network, and it will play a significant role in intelligent grid.
In order to more preferably and on a large scale use and develop micro-capacitance sensor electricity generation system, micro-grid connection operation turns into the research weight that microgrid generates electricity
Point.Because micro-capacitance sensor includes substantial amounts of various distributed power sources, such as：Wind-power electricity generation, solar energy power generating etc., these are distributed
The power output of power supply typically all has randomness and intermittence.It will make it that the quality of power supply level of micro-capacitance sensor is relatively low, if not adopting
Taking measure improves access power network, can deteriorate the quality of power supply level of main power network.Current microgrid uses traditional static switch substantially
To control being incorporated into the power networks for microgrid, this method is simple in construction, low cost but poor reliability, flexibility is not enough, it is impossible to meet
It is required that.
The content of the invention
In order to solve the above technical problems, the utility model provides a kind of micro-grid connection control dress based on back-to-back converter
Put, the device utilizes the working characteristics of back-to-back converter, with reference to two kinds of control methods, realize the quick of bulk power grid and micro-capacitance sensor
It is grid-connected.
The technical scheme that the utility model is taken is；
A kind of micro-grid connection control device based on back-to-back converter, including back-to-back converter, dc-link capacitance
Device C0, LCL filter.The back-to-back converter includes：Active rectifier VSC1 positioned at bulk power grid side, positioned at micro-capacitance sensor side
Inverter VSC2；The back-to-back converter connection DC bus capacitance C0.Active rectifier VSC1 and inverter VSC2
Connected by dc bus.Bulk power grid connects back-to-back converter by the first LCL filter, and back-to-back converter passes through second
LCL filter connects micro-capacitance sensor.The back-to-back converter connects V/F control loops, PQ control loops or dc bus electricity
Press control loop.
The inverter VSC2 be modularization exchange micro-capacitance sensor external interface, its AC through the second LCL filter with it is micro-
Power network is connected.
The active rectifier VSC1 is connected in series in bulk power grid side by the first LCL filter.
The inverter VSC2 is connected in series in micro-capacitance sensor side by the second LCL filter.
The bulk power grid is more than 400V voltage levels power networks.
The micro-capacitance sensor includes linear load and nonlinear load.
The voltage between lines of the micro-capacitance sensor and bulk power grid is 380V.
The DC bus-bar voltage is 750V.
A kind of micro-grid connection control device based on back-to-back converter of the utility model, has the beneficial effect that：
1：The AC network of 2 different frequencies, amplitude and phase can be connected.
2：AC side of converter overtone order is high, harmonic content is small, easily filter.
3：Active power exchanges controllable, and can double as the reactive power source of AC system.
4：The fluctuation of active rectifier DC side output voltage is small, requires low to DC filter.
5：Mode of operation variation；AC network utility power quality control function can be added.
6：The convenient, flexible, short time limit of back-to-back converter design and construction, environmental pollution are small, are particluarly suitable for following neck
Domain is applied, such as connect distributed power supply, the asynchronous interconnection of AC network, remote load power, offshore drilling platform or orphan
Island powers.
7：The grid-connected switch of this back-to-back converter mode can solve the grid-connected harmful effect caused of ordinary tap.
8：Due to based on V/F control and PQ control back-to-back converter can control simultaneously and independently from each other it is active and
Reactive power, when microgrid is grid-connected using which, it is possible to neatly control flow direction and the size of active power, so that
Strengthen the active regulating power of power supply, reduce the frequency fluctuation of micro-grid system.
9：Isolation is strong, grid-connected rear micro- without considering with frequency, with pressure, same phase during micro-grid connection, it is possible to achieve rapid combination
The voltage of net, frequency can also be different from power network, can make it that microgrid is more flexibly run.Simultaneously when back-to-back converter device
Either party of two ends breaks down, and all without too much influence is caused to the other end, strengthens the independence of each self-operating.
10：Modular construction and back-to-back mode are greatly lowered requirement of the current transformer to place and environment, with cost
The advantages of low, floor space is small, noise pollution is few.
Brief description of the drawings
Fig. 1 is the structural representation of back-to-back converter power circuit.
Fig. 2 is the back-to-back converter apparatus structure schematic diagram under PQ control models and V/F control models.
Fig. 3 is the V/F control loops of current transformer.
Fig. 4 is the PQ control loops of current transformer.
Fig. 5 is DC bus-bar voltage control loop.
Embodiment
As shown in figure 1, a kind of micro-grid connection control device based on back-to-back converter, including it is back-to-back converter, straight
Flow bus capacitor C0, LCL filter.
The back-to-back converter includes：Active rectifier VSC1 positioned at bulk power grid side, the inversion positioned at micro-capacitance sensor side
Device VSC2；The back-to-back converter connection DC bus capacitance C0.Active rectifier VSC1 and inverter VSC2 passes through straight
Flow bus connection.Bulk power grid connects back-to-back converter by the first LCL filter, and back-to-back converter is filtered by the 2nd LCL
Ripple device connects micro-capacitance sensor.The back-to-back converter connects V/F control loops, PQ control loops or DC bus-bar voltage control
Loop processed.
First LCL filter of back-to-back converter and both sides, the second LCL filter collective effect, to filter output electricity
Flow harmonic wave.When being connected with both sides AC system, centre is by DC bus capacitance C0 in the topological structure mode of AC-DC-AC
Connection is formed, and the bidirectional flow of energy is realized by the control to two ends active rectifier VSC1 and inverter VSC2 running statuses
It is dynamic.
DC bus capacitance C0 provides voltage support for current transformer, and reduces DC side harmonics.
The inverter VSC2 be modularization exchange micro-capacitance sensor external interface, its AC through the second LCL filter with it is micro-
Power network is connected.
The active rectifier VSC1 is connected in series in bulk power grid side by the first LCL filter.Its internal structure such as Fig. 1
It is shown to be made up of 6 full-controlled devices (IGBT/IGCT), and PWM control technologies are combined, realize the flexible control to regulated variable
System, DC side is transferred to by energy by AC.
The inverter VSC2 is connected in series in micro-capacitance sensor side by the second LCL filter.Its internal structure has with above-mentioned
Source rectifier VSC1 is identical, and energy is transferred into AC by DC side.
The bulk power grid is more than 400V voltage levels power networks.
The micro-capacitance sensor includes linear load and nonlinear load.
The voltage between lines of the micro-capacitance sensor and bulk power grid is 380V, and the DC bus-bar voltage is 750V.
Fig. 2 is the back-to-back converter device in the case where PQ is controlled and V/F is controlled：Active rectifier VSC1 exchanges for modularization
Micro-capacitance sensor external interface, its AC is connected through LCL filter with bulk power grid.It is active when module, which turns to power network, to be incorporated into the power networks
Rectifier VSC1 controls maintain the stabilization of DC bus-bar voltage, ensure the stable operation of linear, non-linear exchange micro-capacitance sensor, simultaneously
Control module micro-capacitance sensor participates in bulk power grid operation control.Active rectifier VSC1 runs on PQ control models, inverter VSC2
V/F control models are run on, AC output amplitude, the three-phase alternating voltage of frequency stabilization ensure exchange micro-capacitance sensor all the time simultaneously
Network operation.Active rectifier VSC1 is connected with inverter VSC2 by dc bus.
Active rectifier VSC1 control loop is unique in two kinds of operator schemes, and current controller can be determined respectively
The amplitude and phase of current reference, to control between DC links voltage and not draw any reactive power from the power network.
Inverter VSC2 is used in different control loops, PQ control models, can control active, idle point of current transformer
Amount, V/F control models can control the voltage of micro-grid system.
The micro-grid connection control device based on back-to-back converter is inquired into from three control loops separately below.It is respectively
V/F control loops, PQ control loops and DC bus-bar voltage control loop.
One：In V/F control loops, the amplitude and frequency of power network are by load current control.In the control loop, measurement
The voltage of the capacitor of wave filter is compared with reference voltage, provides output to controller.And introduce inner current loops
It is applied not only to eliminate the LC resonance that damping filter is introduced, and for improving the stability of whole system.Therefore, output filtering
The condenser current of device is fed back in inner-current control loop, to provide active damping and enhancing immunity to interference.Inside control
Device processed is using gain KC as leading indicator, and its selection will consider the influence of external loop-around.
The model of the system is as shown in Figure 3.The model of load is divided into two parts, linear segment and non-linear partial.Line
The model of property fractional load is as the function of output voltage, and non-linear partial is used as the disturbance in model.In the design process,
The KC value very little to be set, for the resonant frequency that decays.Because KC value is larger, it can cause higher in stability at lower frequencies generation
Gain, can amplify low-frequency noise.In addition, KC value is larger, produce at the operating frequencies after larger phase, this may be to reference
Tracking and AF panel have negative consequence.
It is negative with what is provided in suppressed FCM except the resonant controller under working frequency, it is necessary to increase harmonic resonance controller
Carry harmonic current.
The integral term of each frequency is determined according to its desired amplitude.Assuming that ω C are equal to 1.5rad/s, then by integral term
Be tuned as with desired bandwidth, and at working frequency and its harmonic wave provide maximum possible amplitude.Here bandwidth is set
It is set to 5500rad/s.
Two：In PQ control loops, micro-capacitance sensor has voltage source, and the reference value of electric current is according to desired active and reactive power
And load voltage is determined.Inner current loops are identical with V/F control loops, and inverter must inject having for specified quantitative
Work(and reactive power, to determine the amplitude and phase of reference current.The outwardly and inwardly design process of controller in this mode
It is identical with the process that V/F control loops are described.Specified according to desired bandwidth and the tracking at working frequency integral term and
Cut-off frequency.
Under PQ control models, without adding harmonic resonance controller.In the previous hypothesis for ω C, integral term
Value is tuned at 100 to reach 2840rad/s bandwidth, and its value is sufficiently small compared with resonant frequency.In order to realize this bandwidth, KP
Value must increase so that damping ratio will reduce enough.Therefore, adding phase advancer to increase the phase at crossover frequency
Position.
Three：In DC bus-bar voltage control loop, in order to which the voltage between the DC links in back-to-back converter is kept
In steady state value, the active power for flowing into DC links is necessarily equal to the active power of load absorption.Therefore, the electricity of capacitor need to be measured
Press and be compared it with reference voltage, gained difference can make power network side converter produce current reference width by PI controllers
Value.It is emphasized that the current reference amount must with bulk power grid arc in phase, so as not to draw any idle work(from bulk power grid
Rate.
Wherein, T1 is the time constant of the current control loop of power network side converter, and it is equal to：
R0 and K are steady-state equivalent resistance and the transmission function from current amplitude to active power respectively, it can be found that：
Claims (8)
1. a kind of micro-grid connection control device based on back-to-back converter, including back-to-back converter, DC bus capacitance
（C0）, LCL filter；It is characterized in that：The back-to-back converter includes：Active rectifier positioned at bulk power grid side
（VSC1）, inverter positioned at micro-capacitance sensor side（VSC2）；The back-to-back converter connects DC bus capacitance（C0）；It is active
Rectifier（VSC1）With inverter（VSC2）It is connected in parallel by dc bus；Bulk power grid is connected by the first LCL filter and carried on the back
Backrest current transformer, back-to-back converter connects micro-capacitance sensor by the second LCL filter；The back-to-back converter connection V/F controls
Loop processed, PQ control loops or DC bus-bar voltage control loop.
2. a kind of micro-grid connection control device based on back-to-back converter according to claim 1, it is characterised in that：It is described
Inverter（VSC2）Micro-capacitance sensor external interface is exchanged for modularization, its AC is connected through the second LCL filter with micro-capacitance sensor.
3. a kind of micro-grid connection control device based on back-to-back converter according to claim 1, it is characterised in that：It is described
Active rectifier（VSC1）Bulk power grid side is connected in series in by the first LCL filter.
4. a kind of micro-grid connection control device based on back-to-back converter according to claim 1 or claim 2, it is characterised in that：
The inverter（VSC2）Micro-capacitance sensor side is connected in series in by the second LCL filter.
5. a kind of micro-grid connection control device based on back-to-back converter according to claim 1, it is characterised in that：It is described
Bulk power grid is more than 400V voltage levels power networks.
6. a kind of micro-grid connection control device based on back-to-back converter according to claim 1, it is characterised in that：It is described
Micro-capacitance sensor includes linear load and nonlinear load.
7. a kind of micro-grid connection control device based on back-to-back converter according to claim 1, it is characterised in that：It is described
The voltage between lines of micro-capacitance sensor and bulk power grid is 380V.
8. a kind of micro-grid connection control device based on back-to-back converter according to claim 1, it is characterised in that：It is described
DC bus-bar voltage is 750V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621252367.3U CN206332461U (en) | 2016-11-16 | 2016-11-16 | A kind of micro-grid connection control device based on back-to-back converter |
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| CN201621252367.3U CN206332461U (en) | 2016-11-16 | 2016-11-16 | A kind of micro-grid connection control device based on back-to-back converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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- 2016-11-16 CN CN201621252367.3U patent/CN206332461U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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| CF01 | Termination of patent right due to non-payment of annual fee |