CN107171346B - Unbalance voltage control method based on virtual synchronous generator - Google Patents
Unbalance voltage control method based on virtual synchronous generator Download PDFInfo
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- CN107171346B CN107171346B CN201710447554.XA CN201710447554A CN107171346B CN 107171346 B CN107171346 B CN 107171346B CN 201710447554 A CN201710447554 A CN 201710447554A CN 107171346 B CN107171346 B CN 107171346B
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The present invention relates to a kind of unbalance voltage control methods based on virtual synchronous generator, on the basis of virtual synchronous generator, a kind of balanced voltage control method is provided to L-type filter under the conditions of off-network, this method proposes a kind of negative voltage control strategy on the basis of original virtual synchronous generator control method.Compared with existing off-network unbalance voltage control method, the present invention solves the control of unbalance voltage under unbalanced power supply state using the method for voltage positive-negative sequence separation, effectively inhibits unbalance voltage effectively rapidly, so that power system restoration be made to balance；The advantages that present invention proposes control method, possesses and controls precision height, fast response time, extends in other single-phase or three-phase grid-connected inverter control method.
Description
Technical field
The present invention relates to a kind of generator control technology, in particular to a kind of imbalance electricity based on virtual synchronous generator
Press control method.
Background technique
With the rapid development of economy, the increasingly reinforcement of global energy crisis and environmental problem.Meanwhile coal, petroleum etc. pass
The energy of uniting aggravates the pollution of environment, therefore, gets growing concern for for the distributed power generation that new energy is rationally applied.
Since most of distributed energies will access power grid by inverter, so the research of adverser control technology seems especially heavy
It wants.Along with the research and application of more control methods, some more advanced control strategies are by gradually using in systems.
Wherein, intelligent control is even more and is more and more widely used.
Virtual synchronous generator is in the distributed generation system grid-connected based on electronic power inverter, by outfit
Energy storage link, and use gird-connected inverter control algolithm appropriate, make the distributed generation resource based on gird-connected inverter from Wai Te
Property on simulate or partial simulation goes out the frequency and voltage control characteristic of synchronous generator, so as to improve the stabilization of distributed system
Property.
Most of control is carried out under the conditions of grid balance, does not consider uneven condition.When power grid actual motion,
Unbalanced power supply phenomenon frequent occurrence, if not being designed to uneven situation in control strategy for inverter design process.If
Energy imbalance occurs for power grid, and inverter performance can be made to decline, and will lead to inverter damage when serious.Wherein, power grid three-phase is not
Balance is the aspect mainly considered in inverter design
When power grid occurs uneven, unbalanced network voltage can make inverter output voltage imbalance similarly occur
Situation makes output voltage contain negative sequence component, to influence the normal operation of three-phase inverter.By inhibiting negative sequence voltage components
To make voltage reach balance.
Summary of the invention
The problem of the present invention be directed to the normal operations that unbalanced power supply influences three-phase inverter proposes a kind of based on void
The unbalance voltage control method of quasi- synchronous generator filters L-type under the conditions of off-network on the basis of virtual synchronous generator
Wave device provides a kind of balanced voltage control method, and this method proposes on the basis of original virtual synchronous generator control method
A kind of negative voltage control strategy.This method can make system quickly and effectively reach balance under the conditions of unbalanced.
The technical solution of the present invention is as follows: a kind of unbalance voltage control method based on virtual synchronous generator, virtual same
Step generator three-phase grid-connected inverter includes DC voltage source U, three-phase inverter, L filter, detection L filter output electricity
Voltage detector, the detection three-phase inverter of pressure export current detector, virtual exciter, the virtual video machine, power of electric current
Detector, virtual synchronous generator algoritic module, voltage positive-negative sequence separation module and PWM drive module, DC voltage source voltage
Into three-phase inverter, alternating voltage is generated by conversion, the voltage of generation is sent into L filter, grid-connected end is exported after filtering, is
Control method of uniting is specific as follows:
Real-time active power and reactive power are calculated by virtual exciter, virtual video machine and power detector, is sent
Enter virtual synchronous generator algoritic module, the machinery that virtual synchronous generator is obtained by calculating the real-time active power of conversion turns
Square, machine torque and rotary inertia calculate the synchronous angular velocity of power grid and the mechanical angle speed of synchronous generator by mathematical relationship
Degree；Reference voltage is obtained by calculation in reactive power power；
Voltage detection signal u after L filtera,ub,ucIt is sent into voltage positive-negative sequence separation module, passes through positive-negative sequence separation point
From structure, by voltage ua,ub,ucIt is divided into positive sequence voltage component upWith negative sequence voltage components un, then respectively to positive-negative sequence component of voltage
It is handled；
Positive-sequence component processing: the voltage positive-sequence component under two-phase rotating coordinate system is made the difference with reference voltage, resulting value
Positive-sequence component i after being handled by PI as reference current and the real-time current of three-phase inverter outputpIt is compared processing；
Negative sequence component processing: the voltage negative sequence component under two-phase rotating coordinate system is made the difference with parameter zero, resulting value warp
Cross the negative sequence component i that PI processing obtains the real-time current of reference current and three-phase inverter output laternIt is compared processing；
The result that positive-negative sequence component of voltage is handled is transformed into three phase coordinate systems by two phase coordinate systems again, exports after conversion
Signal is re-fed into SPWM module, exports switching drive signal by SPWM module, which controls inversion after overdrive circuit
The on and off of device switch, to control grid-connected inverter system.
The beneficial effects of the present invention are: the present invention is based on the unbalance voltage control method of virtual synchronous generator, with
Existing off-network unbalance voltage control method is compared, and the present invention solves unbalanced power supply using the method for voltage positive-negative sequence separation
The control of unbalance voltage under state, can be such that unbalance voltage is effectively inhibited, so that power system restoration be made to balance；This hair
The advantages that bright proposition control method possesses and controls precision height, fast response time, it is inverse to extend to other single-phase or three-phase grid
Become in the control method of device.
Detailed description of the invention
Fig. 1 is the entirety knot the present invention is based on virtual synchronous generator three-phase grid-connected inverter unbalance voltage control method
Structure block diagram；
Fig. 2 is negative voltage control strategy block diagram of the present invention；
Fig. 3 is that balanced voltage of the present invention controls analogous diagram.
Specific embodiment
If Fig. 1 is one kind proposed by the present invention under off-network state, it is based on virtual synchronous generator three-phase grid-connected inverter
The overall structure block diagram of unbalance voltage control method, system mainly include DC voltage source U, three-phase inverter, L filter,
Detect the voltage detector of L filter output voltage, the current detector of detection three-phase inverter output electric current, virtual excitation
Machine, virtual video machine, power detector, virtual synchronous generator algoritic module, voltage positive-negative sequence separation module and PWM drive mould
Block.DC voltage source provides the voltage of 700V, into three-phase inverter, generates alternating voltage by conversion, the voltage of generation is sent
Enter L filter, grid-connected end is exported after filtering.Calculated by virtual exciter, virtual video machine and power detector has in real time
Function power and reactive power are sent into virtual synchronous generator algoritic module, are obtained virtually by calculating the real-time active power of conversion
The machine torque of synchronous generator, machine torque and rotary inertia calculate the synchronous angular velocity and together of power grid by mathematical relationship
Walk the mechanical angular speed (namely electrical angular speed) of generator；Reactive power power obtains reference voltage by relevant calculation.
Then, the voltage detection signal u after L filtera,ub,ucIt is sent into voltage positive-negative sequence separation module, is separated by positive-negative sequence
Structure, by voltage ua,ub,ucIt is divided into positive sequence voltage component upWith negative sequence voltage components un, then respectively to positive-negative sequence component of voltage into
Row processing；Voltage positive-sequence component under two-phase rotating coordinate system is made the difference with reference voltage, resulting value is after PI processing
Positive-sequence component i as reference current and the real-time current of three-phase inverter outputpCompare processing；Again to negative sequence component at
Reason, it is similar to positive-sequence component, but experiment purpose be control voltage negative sequence component be zero, therefore, negative sequence component is done with parameter zero
Difference, resulting value obtain the negative sequence component i of the real-time current of reference current and three-phase inverter output after PI processingnInto
Row is relatively handled；Obtained result is converted by two phase coordinate systems to three phase coordinate systems again.Output signal is re-fed into after finally converting
In SPWM module, switching drive signal is exported by SPWM module, which controls connecing for inverter switching device after overdrive circuit
Logical and shutdown, to control grid-connected inverter system.
Correctness and feasibility to illustrate the invention carry out simulating, verifying to a L-type three-phase grid-connected inverter system.
Simulation parameter are as follows: the switching frequency of DC voltage source voltage 700V, network voltage virtual value 220V, SPWM are 15KHz, L-type filter
Wave device parameter is L1=10mH.
The potential voltage vector that active and reactive power is converted into virtual synchronous generator is by virtual synchronous generator
Wherein θ=∫ ω dt (the mechanical angular speed that ω is synchronous generator) is the phase of virtual synchronous generator.It can be achieved
Constant power is injected to power grid in three-phase power grid voltage balance, and inertia and damping support can be provided for power grid.
Electromotive force U can be analyzed to positive-sequence component, negative sequence component and zero-sequence component, and the three-phase bridge connected using no middle line
Inverter, therefore the influence of zero sequence electromotive force is not considered
Wherein UP、UNThe peak value of respectively positive and negative order components, αuP、αuNThe respectively initial phase angle of positive-negative sequence electromotive force.
Inverter exports instantaneous power when three-phase imbalance under two-phase rotating coordinate system are as follows:
P in formula0、p1、p2Respectively indicate the average value, cosine harmonics peak value and multifrequency sinusoid peak value of active power, q0、q1、
q2Respectively indicate the average value, cosine harmonics peak value and multifrequency sinusoid peak value of reactive power；Active voltage under d cordic phase rotator system
It is with electric currentActive voltage and electric current are under q cordic phase rotator systemReactive voltage under d cordic phase rotator system
It is with electric currentReactive voltage and electric current are under q cordic phase rotator systemTherefore, as long as disposing negative phase-sequence electricity
Component is pressed, power-balance also can solve.
Therefore, under unbalanced electric grid voltage, the control program of balanced voltage such as Fig. 2.
Fig. 3 is using the balanced voltage control waveform obtained after inhibition voltage negative sequence component strategy.It can be seen from the figure that
In grid voltage three-phase imbalance, the voltage of inverter output still keeps three-phase symmetrical.Its negative sequence component is inhibited.To
It can be concluded that being added after negative voltage control, VSG can export the three-phase voltage of balance.
Claims (1)
1. a kind of unbalance voltage control method based on virtual synchronous generator, virtual synchronous generator three-phase grid-connected inverter
Including DC voltage source U, three-phase inverter, L filter, the voltage detector for detecting L filter output voltage, detection three-phase
The current detector of inverter output current, virtual exciter, virtual video machine, power detector, virtual synchronous generator are calculated
Method module, voltage positive-negative sequence separation module and PWM drive module, DC voltage source voltage enter three-phase inverter, by conversion
Alternating voltage is generated, the voltage of generation is sent into L filter, grid-connected end is exported after filtering, which is characterized in that system control method tool
Body is as follows:
Real-time active power and reactive power are calculated by virtual exciter, virtual video machine and power detector, is sent into empty
Quasi- synchronous generator algoritic module obtains the machine torque of virtual synchronous generator, machine by calculating the real-time active power of conversion
Tool torque and rotary inertia calculate the synchronous angular velocity of power grid and the mechanical angular speed of synchronous generator by mathematical relationship；It is real
When reactive power reference voltage is obtained by calculation；
Voltage detection signal after L filteru a ,u b ,u c It is sent into voltage positive-negative sequence separation module, separation knot is separated by positive-negative sequence
Structure, by voltageu a ,u b ,u c It is divided into positive sequence voltage componentu p And negative sequence voltage componentsu n , then positive-negative sequence component of voltage is carried out respectively
Processing；
Positive-sequence component processing: the voltage positive-sequence component under two-phase rotating coordinate system is made the difference with reference voltage, and resulting value is passed through
Positive-sequence component after PI processing as reference current and the real-time current of three-phase inverter outputi p It is compared processing；
Negative sequence component processing: the voltage negative sequence component under two-phase rotating coordinate system is made the difference with parameter zero, and resulting value passes through PI
The negative sequence component of the real-time current of reference current and three-phase inverter output is obtained after processingi n It is compared processing；
The result that positive-negative sequence component of voltage is handled is transformed into three phase coordinate systems, output signal after conversion by two phase coordinate systems again
It is re-fed into SPWM module, switching drive signal is exported by SPWM module, which controls inverter after overdrive circuit and open
The on and off of pass, to control grid-connected inverter system.
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| CN108667080B (en) * | 2018-05-22 | 2019-11-22 | 东南大学 | A kind of virtual synchronous machine active balance control method under unbalanced electric grid voltage |
| CN114172172B (en) * | 2021-11-30 | 2024-02-20 | 国网湖南省电力有限公司 | Non-isolated dynamic voltage restorer three-phase load unbalance control method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218590A (en) * | 2014-09-10 | 2014-12-17 | 合肥工业大学 | Unbalance voltage compensation and control method based on virtual synchronous machine |
| CN105098804A (en) * | 2015-07-08 | 2015-11-25 | 国家电网公司 | Method and device for controlling three-phase unbalanced current of virtual synchronous generator |
| EP2963759A1 (en) * | 2013-02-28 | 2016-01-06 | Kawasaki Jukogyo Kabushiki Kaisha | Power conversion device for connection to grid |
| CN105811470A (en) * | 2016-04-27 | 2016-07-27 | 南京南瑞太阳能科技有限公司 | Virtual synchronous machine control system and control method under unbalanced power grid condition |
| CN105958552A (en) * | 2016-06-24 | 2016-09-21 | 西安交通大学 | Control method for virtual synchronous generator capable of being adapted to imbalanced power grid and load conditions |
| CN106685252A (en) * | 2017-03-02 | 2017-05-17 | 江苏大学 | Three-phase and four-arm inverter control method and system based on virtual synchronizer |
| CN106786780A (en) * | 2017-03-02 | 2017-05-31 | 江苏大学 | A kind of grid-connected control method and system based on virtual synchronous generator |
-
2017
- 2017-06-14 CN CN201710447554.XA patent/CN107171346B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2963759A1 (en) * | 2013-02-28 | 2016-01-06 | Kawasaki Jukogyo Kabushiki Kaisha | Power conversion device for connection to grid |
| CN104218590A (en) * | 2014-09-10 | 2014-12-17 | 合肥工业大学 | Unbalance voltage compensation and control method based on virtual synchronous machine |
| CN105098804A (en) * | 2015-07-08 | 2015-11-25 | 国家电网公司 | Method and device for controlling three-phase unbalanced current of virtual synchronous generator |
| CN105811470A (en) * | 2016-04-27 | 2016-07-27 | 南京南瑞太阳能科技有限公司 | Virtual synchronous machine control system and control method under unbalanced power grid condition |
| CN105958552A (en) * | 2016-06-24 | 2016-09-21 | 西安交通大学 | Control method for virtual synchronous generator capable of being adapted to imbalanced power grid and load conditions |
| CN106685252A (en) * | 2017-03-02 | 2017-05-17 | 江苏大学 | Three-phase and four-arm inverter control method and system based on virtual synchronizer |
| CN106786780A (en) * | 2017-03-02 | 2017-05-31 | 江苏大学 | A kind of grid-connected control method and system based on virtual synchronous generator |
Non-Patent Citations (1)
| Title |
|---|
| 考虑不平衡电网电压的虚拟同步发电机平衡电流控制方法;陈天一等;《电网技术》;20160331;第40卷(第3期);全文 * |
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