CN109687517A - A kind of more parallel connection of three-phase inverter systems of isolated microgrid and its distributed control method - Google Patents
A kind of more parallel connection of three-phase inverter systems of isolated microgrid and its distributed control method Download PDFInfo
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Classifications
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/38—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
Abstract
The present invention relates to a kind of more parallel connection of three-phase inverter systems of isolated microgrid and its distributed control methods, including multiple parallel connection of three-phase inverter units, threephase load and ac bus, wherein each parallel connection of three-phase inverter unit includes three-phase inverting circuit and its control circuit and effective transmission line impedance.The present invention can effectively realize without or few communication line under multi-parallel inverter between Collaborative Control and there is good voltage to adjust and current uniform characteristic, system dynamic response is rapid, is not necessarily to multiloop controller, realizes simple and effective；It can be used as the networking element in isolated micro-capacitance sensor, provide voltage, frequency support for system；When power swing occurs for system or when sudden load change, it can be achieved that fast and accurately power distribution, ensure that the power supply reliability of isolated microgrid.
Description
Technical field
The invention belongs to isolated microgrid technical fields, are related to more parallel connection of three-phase inverter operation control skill of isolated microgrid
Art, the more parallel connection of three-phase inverter systems of especially a kind of isolated microgrid and its distributed control method.
Background technique
Key technology one of of the micro-capacitance sensor as smart grid can effectively solve distributed generation resource because of position dispersion, form
Multiplicity, feature it is different and to major network and impact caused by user security risk, realize effectively integrating and efficiently utilizing to distributed generation resource, closely
It is had received widespread attention over year.In the case where microgrid runs on island mode, more parallel connection of three-phase inverter operations are needed, collectively as
Networking element provides voltage and frequency support for independent micro-capacitance sensor.
But in more parallel connection of three-phase inverter systems, since the equivalent output impedance of every inverter is connected with to load
The line impedance of point all has differences, and affects the precision of its power distribution.Especially in sudden load change and and mesh element such as light
In the case where volt, wind turbine power generation fluctuation, voltage, the frequency stabilization of load tie point are not only maintained, also to be guaranteed active and reactive
The accurate distribution of power.Therefore, effective coordination control strategy is formulated, is to ensure that the micro-grid system of more parallel connection of three-phase inverter
Stable operation, the key realized power-sharing, reduce energy loss.
Currently, more parallel connection of three-phase inverter operation control strategies are broadly divided into two methods of master & slave control and equity control.
Master & slave control requirement group net unit must possess enough Capacity Margins, and this strongly limits the scales of micro-capacitance sensor and system to expand
Hold, and need interconnection line in control, reduces the reliability of system.There is the reciprocity control strategy of interconnection line to the reality of communication
When property is more demanding, and when facing signal interference and decaying the problems such as serious, control performance is difficult to ensure.
The equity control of no interconnection line is also referred to as decentralised control, and more popular decentralized control refers mainly under power at present
It hangs down, i.e., by the motor synchronizing for using for reference synchronous generator and voltage droop characteristic, realizes the power distribution of no control interconnection between micro- source.But
It is that there are the intrinsic contradictions of voltage regulation performance and power distribution precision for the sagging control of tradition, will cause voltage, frequency departure volume
Definite value or the unequal drawback of power distribution.Therefore, the various improved methods based on the sagging control of tradition are proposed in succession, are such as added
Virtual impedance and additional feedback loop, but will cause the complexity and parameter tuning difficulty of System control structures, influence control effect；Again
Upper layer Correction and Control is such as added, but will affect the dynamic responding speed of whole system.
Therefore, the novel more parallel connection of three-phase inverter system dcs of isolated microgrid of one kind how to be proposed and are divided
Scattered control strategy is those skilled in the art's technical problem urgently to be solved.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, proposes that a kind of design is reasonable, realizes quick, accurate power
Distribution and the strong more parallel connection of three-phase inverter systems of isolated microgrid and its distributed control method of power supply reliability.
The present invention solves its realistic problem and adopts the following technical solutions to achieve:
1, the more parallel connection of three-phase inverter systems of a kind of isolated microgrid, it is characterised in that: including multiple parallel connection of three-phase inverter
Unit, threephase load and ac bus, the parallel connection of three-phase inverter unit include three-phase inverting circuit and its control circuit and
Effective transmission line impedance；The three-phase inverting circuit includes three-phase full-bridge inverter and LC filter circuit；The three phase full bridge is inverse
Become device and export Three-phase alternating current signal, successively exports by the LC filter circuit and effective transmission line impedance to three-phase alternating current
Bus；The control circuit includes error tracking control unit, observer, distributed director, system reconfiguration device, reference wave generation
Device, Park conversion module, Park inverse transform block and Sine Pulse Width Modulation module；
The Park conversion module for acquiring three-phase voltage current signal, output end respectively with observer, system weight
Structure device is connected with reference wave generator, for the three-phase voltage current signal of acquisition to be obtained dq coordinate system after Park is converted
Signal vodq、vkdq、ikdq, exported respectively to observer, system reconfiguration device and reference wave generator；The output end of the observer
It is connected with error tracking control unit, for intermediate sight signal xi will to be generated2dqIt exports to error tracking control unit；The error
The output end of tracking control unit is connected with distributed director, outputs this to after filter tracking error signal point for calculating
Cloth controller；The output end of system reconfiguration device is connected with distributed director, rear defeated for current signal to be reconstructed
Out to distributed director；The output end of the distributed director is connected with reference wave generator, for generating distribution
Control voltage signal ukdqAfter output this to reference wave generator；The output end of the reference wave generator is successively anti-with Park
Conversion module is connected with Sine Pulse Width Modulation module, for being based on signal ukdq、ikdq、vkdq, calculate output modulating wave letter
Number vikdq, then through Park inverse transformation and Sine Pulse Width Modulation obtain 6 way switch control waves；The sine pulsewidth tune
The output end three-phase full-bridge inverter of SPWM module processed is connected, for exporting 6 way switch control waves to three-phase simultaneously
Connection inverter is controlled.
Moreover, the LC filter circuit includes filter circuit equivalent resistance, filter inductance and the filtered electrical to link together
Hold；The three-phase full-bridge inverter exports Three-phase alternating current signal, successively by through filter circuit equivalent resistance, filter inductance,
Filter capacitor and effective transmission line impedance are exported to three-phase alternating current bus.
A kind of distribution control method of the more parallel connection of three-phase inverter systems of isolated microgrid, each three-phase inverter in parallel
Self-contr ol is all carried out, kth platform parallel three phase inverter is all controlled as follows, the specific steps of which are as follows:
Step 1, in the control circuit of kth platform parallel three phase inverter, by the collection voltages v of ac busoWith it is given
Reference voltage value vrefIt makes the difference, obtains tracking error signal ev=vo-vref；
Step 2, the tracking error signal e for obtaining step 1vFilter is calculated as follows in error originated from input tracking control unit
Wave tracking error signalAnd it exports to the input terminal of the distributed director；
In formula, qevIt is the tracking error signal evThrough the amplified value of rate mu-factor q；ξ2It is the exchange
Busbar voltage voThe value obtained through observer；
Step 3, observer input are collection voltages dq component vodq, obtaining output through following formula is ξ2dq；
In formula, k0It is greater than 0 observer gain；ξ1And ξ2It is respectivelyAnd voEstimated value；
Step 4, the input of system reconfiguration device are acquisition electric current dq component ikdq, obtaining output by following formula is xkdq；
In formula, C is reconstructor parameter；
Step 5, distributed director input are xkdqWithIt is calculated as follows and obtains output quantity ukdq；
In formula, n is the sum of shunt chopper；α,ks, ρ be it is customized be greater than zero parameter；Q is ratio enlargement system
Number.
Step 6, the input of reference wave generator are ukdq, vkdqAnd ikdq, it is calculated as follows and obtains output modulating wave letter
Number vikdq；
In formula, Lk, RkAnd Ck(k=1,2 ... n) be equivalent outlet filter inductance, resistance and capacitor respectively.
Step 7, modulation wave signal vikdqThe control of 6 tunnels is obtained through Park inverse transform block and Sine Pulse Width Modulation module
The three-phase inverting circuit of impulse wave, input kth platform parallel three phase inverter is controlled.
The advantages of the present invention:
1, the present invention can carry out three-phase inverter system in parallel in micro-capacitance sensor without communication or few communication coordinated control
(no shunt chopper switching, does not need to communicate, and parallel inverter in more new system is only needed when there is three-phase inverter switching in parallel
Total number of units of device).In system independent operating, which can meet voltage modulability simultaneously and eliminate inverter output current
Between error, and fluctuate or load in power when changing, quick maintenance voltage, frequency stabilization, while realizing power
Accurate distribution, to ensure the reliability service in the case of micro-grid system stable state and transient state.
2, the present invention can effectively realize without or few communication line under multi-parallel inverter between Collaborative Control and have good
Good voltage adjusts and current uniform characteristic, and system dynamic response is rapid, is not necessarily to multiloop controller, realizes simple and effective；It can
As the networking element in isolated micro-capacitance sensor, voltage, frequency support are provided for system；When system generation power swing or load are prominent
, it can be achieved that fast and accurately power distribution, ensure that the power supply reliability of isolated microgrid when change.
3, of the invention every inverter control signal is all derived from local, therefore can be in nothing or the condition of few communication line
Lower realization decentralised control, improves the reliability and operational flexibility of micro-capacitance sensor entirety, and is easily achieved.
4, the present invention is in the case where ensuring isolated microgrid ac bus voltage stabilization, can accurate distribution load power,
Inhibit electric current to distribute error, eliminates two layers of amendment link of sagging control, improve system dynamic responding speed.
5, the present invention has higher robustness, when fluctuation occurs for Generation Side or load changes, quick maintenance voltage,
Frequency stabilization ensure that the reliability service of micro-grid system.
Detailed description of the invention
Fig. 1 is topological circuit and the signal of control circuit principle of the more parallel connection of three-phase inverter systems of isolated microgrid of the invention
Figure；
Fig. 2 is the electric topology figure of the verifying control method of the invention；
Fig. 3 is control method (Proposed control) and tradition sagging control (CDCM) and synchronous reference of the invention
Frame virtual impedance ring controls (SRF-VIL) in active power, reactive power, inverter line current, ac bus voltage four directions
The comparison diagram in face.
Specific embodiment
The embodiment of the present invention is described in further detail below in conjunction with attached drawing:
A kind of more parallel connection of three-phase inverter systems of isolated microgrid, as shown in Figure 1, including multiple parallel connection of three-phase inverter units
(15), threephase load (14) and ac bus (12), the parallel connection of three-phase inverter unit (15) includes three-phase inverting circuit
(17) and its control circuit (16) and effective transmission line impedance (11)；The three-phase inverting circuit (17) includes three phase full bridge
Inverter (7) and LC filter circuit (18)；
The three-phase full-bridge inverter (7) exports Three-phase alternating current signal, successively passes through the LC filter circuit (18) and waits
Transmission line impedance (11) output is imitated to three-phase alternating current bus (12)；
The control circuit includes error tracking control unit (1), observer (2), distributed director (3), system reconfiguration
Device (6), reference wave generator (4), Park conversion module (8), Park inverse transform block (5) and Sine Pulse Width Modulation module
(19)；
The Park conversion module (8) for acquiring three-phase voltage current signal, output end respectively with observer (2),
System reconfiguration device (6) is connected with reference wave generator (4), for by the three-phase voltage current signal of acquisition after Park is converted
Obtain dq coordinate system signal vodq、vkdq、ikdq, exported respectively to observer (2), system reconfiguration device (6) and reference wave generator
(4)；The output end of the observer (2) is connected with error tracking control unit (1), for that will generate intermediate sight signal xi2dq
It exports to error tracking control unit (1)；The output end of the error tracking control unit (1) is connected with distributed director (3),
For outputting this to distributed director (3) after calculating filter tracking error signal；The output end of system reconfiguration device (6) with point
Cloth controller (3) is connected, for output after current signal is reconstructed to distributed director (3)；The distribution
The output end of controller (3) is connected with reference wave generator (4), for generating distributed AC servo system voltage signal ukdqAfterwards by it
It exports to reference wave generator (4)；The output end of the reference wave generator (4) successively with Park inverse transform block (5) and just
String Pulse Width Modulation module (19) is connected, for being based on signal ukdq、ikdq、vkdq, calculate output modulation wave signal vikdq,
6 way switch control waves are obtained through Park inverse transformation and Sine Pulse Width Modulation again；The Sine Pulse Width Modulation
The output end three-phase full-bridge inverter (7) of module (19) is connected, for exporting 6 way switch control waves to three-phase simultaneously
Connection inverter (7) is controlled in the present embodiment, and the LC filter circuit includes the equivalent electricity of filter circuit to link together
Hinder (9), filter inductance (10) and filter capacitor (13)；The three-phase full-bridge inverter (7) exports Three-phase alternating current signal, successively
By being exported through filter circuit equivalent resistance (9), filter inductance (10), filter capacitor (13) and effective transmission line impedance (11)
To three-phase alternating current bus (12).
A kind of distribution control method of the more parallel connection of three-phase inverter systems of isolated microgrid, the control method be each simultaneously
The three-phase inverter of connection all carries out self-contr ol, kth platform parallel three phase inverter all controlled as follows (k=1,
2 ... n), the specific steps of which are as follows:
Step 1, in the control circuit of kth platform parallel three phase inverter, by the collection voltages v of ac busoWith it is given
Reference voltage value vrefIt makes the difference, obtains tracking error signal ev=vo-vref；
Step 2, the tracking error signal e for obtaining step 1vError originated from input tracking control unit is calculated by following equation (1)
Filter tracking error signalAnd it exports to the input terminal of the distributed director；
In formula, qevIt is the tracking error signal evThrough the amplified value of rate mu-factor q；ξ2It is the exchange
Busbar voltage voThe value obtained through observer；
Step 3, observer input are collection voltages dq component vodq, obtaining output through formula (2) is ξ2dq；
In formula, k0It is greater than 0 observer gain；ξ1And ξ2It is respectivelyAnd voEstimated value；
Step 4, the input of system reconfiguration device are acquisition electric current dq component ikdq, obtaining output by formula (3) is xkdq；
In formula, C is reconstructor parameter；
Step 5, distributed director input are xkdqWithIt is calculated by following equation (4) and obtains output quantity ukdq；
In formula, n is the sum of shunt chopper；α,ks, ρ be it is customized be greater than zero parameter；Q is ratio enlargement system
Number.
Step 6, the input of reference wave generator are ukdq, vkdqAnd ikdq, calculated by following equation (5) and obtain output modulation
Wave signal vikdq；
In formula, Lk, RkAnd Ck(k=1,2 ... n) be equivalent outlet filter inductance, resistance and capacitor respectively.
Step 7, modulation wave signal vikdqThe control of 6 tunnels is obtained through Park inverse transform block and Sine Pulse Width Modulation module
The three-phase inverting circuit of impulse wave, input kth platform parallel three phase inverter is controlled.
In the present embodiment, it is emulated as shown in Fig. 2, having built 2 inverter parallel systems using Matlab/Simulink
Model, and the actual condition of sudden load change is simulated, it tests to mentioned control algolithm, while compared the sagging control of tradition
(CDCM) and synchronous reference frame virtual impedance ring controls (SRF-VIL).It include shunt chopper #1 (20) in Fig. 2, in parallel inverse
Become device #2 (21), route #1 (22), route #2 (23), three-phase alternating current bus (24) and threephase load (25).Specifically, twice simultaneously
Connection inverter circuit (20,21) is corresponding with three-phase inverting circuit in Fig. 1 (17), and DC side is distributed generation resource direct current in microgrid
Amount is transformed into of ac through inverter effect, then by outlet resistance R and inductance L, capacitor C filtering after, respectively via line (22,
23) three-phase alternating current bus (24) are connected to, provide electric energy to threephase load (25) jointly.Wherein, the control of two inverter units
Link processed is successively controlled using the mentioned control algolithm of the present invention and CDCM, SRF-VIL, is analyzed for comparative experiments.
Proposed control strategy, droop control method (CDCM) is respectively adopted for topology shown in Fig. 2 in combination technology scheme
And the virtual impedance control method (SRF-VIL) under synchronous has carried out contrast simulation.Control algolithm is proposed for research institute
Voltage control performance and power distribution effect, design in stable state (line parameter circuit value is different) and transient state (sudden load change) are calculated
Under such as: in t=4s, active load becomes 11kW by 8kW, and reactive load becomes 11kVar by 8kVar, observes inversion
Active power, reactive power at device #1, inverter #2 and PCC node, voltage, current data.
Simulation result as shown in figure 3, by waveform diagram each in figure, all policies can stable operation, however sagging control
For method (CDCM) due to small sagging coefficient and discrepant line impedance, power distribution precision is poor, and since route hinders
Coupling between anti-, in fact it could happen that active power oscillations.If in addition, when load variation using the sagging control (CDCM) of tradition or
Virtual impedance ring control (SRF-VIL), voltage can deviate under person's synchronous.In contrast, the mentioned method of the present invention
It can make system that there is faster response speed, preferable power distribution performance, and the steady-state error of active and reactive power distribution
All in a small range；When load variation, voltage stabilization, zero deflection may be implemented.
It is emphasized that embodiment of the present invention be it is illustrative, without being restrictive, therefore the present invention includes
It is not limited to embodiment described in specific embodiment, it is all to be obtained according to the technique and scheme of the present invention by those skilled in the art
Other embodiments, also belong to the scope of protection of the invention.
Claims (3)
1. a kind of more parallel connection of three-phase inverter systems of isolated microgrid, it is characterised in that: including multiple parallel connection of three-phase inverter units,
Threephase load and ac bus, the parallel connection of three-phase inverter unit include three-phase inverting circuit and its control circuit and equivalent biography
Defeated line impedance；The three-phase inverting circuit includes three-phase full-bridge inverter and LC filter circuit；The three-phase full-bridge inverter is defeated
Three-phase alternating current signal out is successively exported by the LC filter circuit and effective transmission line impedance to three-phase alternating current bus；
The control circuit include error tracking control unit, observer, distributed director, system reconfiguration device, reference wave generator,
Park conversion module, Park inverse transform block and Sine Pulse Width Modulation module；
The Park conversion module for acquiring three-phase voltage current signal, output end respectively with observer, system reconfiguration device
It is connected with reference wave generator, for the three-phase voltage current signal of acquisition to be obtained dq coordinate system signal after Park is converted
vodq、vkdq、ikdq, exported respectively to observer, system reconfiguration device and reference wave generator；The output end and mistake of the observer
Poor tracking control unit is connected, for that will generate intermediate sight signal xi2dqIt exports to error tracking control unit；The error tracking
The output end of controller is connected with distributed director, for outputting this to distribution after calculating filter tracking error signal
Controller；The output end of system reconfiguration device is connected with distributed director, for exported after current signal is reconstructed to
Distributed director；The output end of the distributed director is connected with reference wave generator, for generating distributed AC servo system
Voltage signal ukdqAfter output this to reference wave generator；The output end of the reference wave generator successively with Park inverse transformation
Module is connected with Sine Pulse Width Modulation module, for being based on signal ukdq、ikdq、vkdq, calculate output modulation wave signal
vikdq, then through Park inverse transformation and Sine Pulse Width Modulation obtain 6 way switch control waves；The sinusoidal pulse width modulation
The output end three-phase full-bridge inverter of SPWM module is connected, for exporting 6 way switch control waves to parallel three phase
Inverter is controlled.
2. the more parallel connection of three-phase inverter systems of a kind of isolated microgrid according to claim 1, it is characterised in that: the LC filter
Wave circuit includes filter circuit equivalent resistance, filter inductance and the filter capacitor to link together；The three-phase full-bridge inverter
Three-phase alternating current signal is exported, successively by through filter circuit equivalent resistance, filter inductance, filter capacitor and effective transmission route
Impedance is exported to three-phase alternating current bus.
3. a kind of more parallel connection of three-phase inverter systems of isolated microgrid of any one claim as described in claim 1 and 2
Distribution control method, it is characterised in that: each three-phase inverter in parallel all carries out self-contr ol, and kth platform parallel three phase is inverse
Become device all to be controlled as follows, the specific steps of which are as follows:
Step 1, in the control circuit of kth platform parallel three phase inverter, by the collection voltages v of ac busoWith given reference
Voltage value vrefIt makes the difference, obtains tracking error signal ev=vo-vref；
Step 2, the tracking error signal e for obtaining step 1vError originated from input tracking control unit, is calculated as follows filter tracking
Error signalAnd it exports to the input terminal of the distributed director；
In formula, qevIt is the tracking error signal evThrough the amplified value of rate mu-factor q；ξ2It is the ac bus
Voltage voThe value obtained through observer；
Step 3, observer input are collection voltages dq component vodq, obtaining output through following formula is ξ2dq；
In formula, k0It is greater than 0 observer gain；ξ1And ξ2It is respectivelyAnd voEstimated value；
Step 4, the input of system reconfiguration device are acquisition electric current dq component ikdq, obtaining output by following formula is xkdq；
In formula, C is reconstructor parameter；
Step 5, distributed director input are xkdqWithIt is calculated as follows and obtains output quantity ukdq；
In formula, n is the sum of shunt chopper；α,ks, ρ be it is customized be greater than zero parameter；Q is rate mu-factor.
Step 6, the input of reference wave generator are ukdq, vkdqAnd ikdq, it is calculated as follows and obtains output modulation wave signal
vikdq；
In formula, Lk, RkAnd Ck(k=1,2 ... n) be equivalent outlet filter inductance, resistance and capacitor respectively.
Step 7, modulation wave signal vikdqThe control pulse of 6 tunnels is obtained through Park inverse transform block and Sine Pulse Width Modulation module
The three-phase inverting circuit of wave, input kth platform parallel three phase inverter is controlled.
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| CN112018803A (en) * | 2019-05-28 | 2020-12-01 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Power control method and device based on parallel double inverters |
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