CN110311402A - A kind of control method and system of virtual synchronous generator - Google Patents
A kind of control method and system of virtual synchronous generator Download PDFInfo
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- CN110311402A CN110311402A CN201810255540.2A CN201810255540A CN110311402A CN 110311402 A CN110311402 A CN 110311402A CN 201810255540 A CN201810255540 A CN 201810255540A CN 110311402 A CN110311402 A CN 110311402A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
- H02J3/381—Dispersed generators
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- Control Of Eletrric Generators (AREA)
Abstract
A kind of control method and system of virtual synchronous generator, comprising: the fluctuation range according to mains frequency calculates rotary inertia；Rotary inertia adaptive control algorithm based on the rotary inertia and preset virtual synchronous generator, controls the virtual synchronous generator.Technical solution of the present invention passes through the self adaptive control of virtual synchronous generator inertia under different situations, realizes the grid-connected stability of distributed generation resource, reduces negative effect of the distributed generation resource to the high-quality operation of power grid security, improves net-source interaction capability.
Description
Technical field
The present invention relates to field of distribution network, and in particular to a kind of control method and system of virtual synchronous generator.
Background technique
Permeability with distributed generation resource in electric system is constantly promoted, and traditional synchronous power generator ratio is gradually
It reduces, the spinning reserve capacity and rotary inertia of electric system are opposite to be reduced.Since non-renewable energy is with intermittent and uncontrollable
Property, and conventional control of generating electricity by way of merging two or more grid systems relatively mostly uses power electronics gird-connected inverter mode, i.e., the electricity issued new energy is most
Limits feed-in power grid, the mode do not embody the intrinsic inertia of typical power system and frequency modulation and voltage modulation control characteristic, this makes
Grid stability problem is more severe.In conventional electric system, system frequency, the dynamic characteristic of voltage and generator are rotated
Inertia and the control of the frequency modulation and voltage modulation of system are related.However distributed generation resource can't be actively engaged in the adjusting of power grid, therefore such as
What makes distributed generation resource grid-connected with open arms, reduces negative effect of the distributed generation resource to the high-quality operation of power grid security, improves power grid
It is the significant problem of intelligent distribution network urgent need to resolve to the receiving ability of distributed generation resource.
If in the distributed generation system grid-connected based on electronic power inverter, if by the energy storage link of outfit,
And gird-connected inverter control algolithm appropriate is used, simulate the distributed generation resource based on gird-connected inverter from external characteristics or portion
Divide the frequency and voltage control characteristic for simulating synchronous generator, so as to improve the stability of distributed system, here it is so-called
Virtual synchronous generator (Virtual Synchronous Generator, VSG) control.
Virtual synchronous machine technology is the electromechanical transient characteristic by simulating synchronous unit, makes the power supply using current transformer or bears
Lotus has the technology of the operation external characteristics such as inertia, damping, frequency and the voltage adjustment of synchronous unit.The control mode of the prior art
It is unable to satisfy control in the case where rotary inertia real-time change, to virtual synchronous generator, this is its limitation.
Summary of the invention
In order to solve the above-mentioned deficiency in the presence of the prior art, the present invention provides a kind of control of virtual synchronous generator
Method and system.
Present invention provide the technical scheme that
A kind of control method of virtual synchronous generator, comprising:
Fluctuation range according to mains frequency calculates rotary inertia；
Rotary inertia adaptive control algorithm based on the rotary inertia and preset virtual synchronous generator, to described
Virtual synchronous generator is controlled.
Preferably, the rotary inertia self adaptive control based on the rotary inertia and preset virtual synchronous generator
Algorithm controls the virtual synchronous generator, comprising:
Rotary inertia adaptive control algorithm based on the preset virtual synchronous generator obtains inertia time constant
With rotary inertia relationship；
Influence by the rotary inertia to the inertia time constant slows down frequency fall off rate and realizes to the void
Quasi- synchronous generator is controlled.
Preferably, the rotary inertia self adaptive control formula of the preset virtual synchronous generator are as follows:
In formula, J: rotary inertia, Pref: active command signal, P: real output signal, ω0: power grid volume constant angular velocity
Degree, ω: power grid actual angular speed, kf: frequency-tracking coefficient, D: damped coefficient, Kω: power regulation factor,Frequency
Change the variation of corresponding active power.
Preferably, the rotary inertia self adaptive control formula of the preset virtual synchronous generator further include: using used
Property time constant and active frequency droop coefficient are expressed, and expression formula is as follows:
In formula, τ ': inertia time constant, D 'P: active frequency droop coefficient.
Preferably, the inertia time constant and the relationship of rotary inertia such as following formula:
Preferably, the fluctuation range according to mains frequency calculates rotary inertia, such as following formula:
In formula, C: frequency variation limit value.Preferably, the frequency variation limit value, comprising:
The frequency variation limit value is preset according to the frequency fluctuation range that microgrid allows.
Another object of the present invention is to propose a kind of control system of virtual synchronous generator, comprising: computing module and
Control module；
The computing module calculates rotary inertia for the fluctuation range according to mains frequency；
The control module, it is adaptive for the rotary inertia based on the rotary inertia and preset virtual synchronous generator
Control algolithm is answered, the virtual synchronous generator is controlled.
Preferably, the computing module, comprising: analysis submodule；
The analysis submodule calculates rotary inertia for the fluctuation range according to mains frequency, such as following formula:
Preferably, the control module, comprising: setting submodule, default submodule and determining submodule；
The setting submodule, for presetting the rotary inertia self adaptive control of virtual synchronous generator；
The default submodule, the frequency fluctuation range for being allowed according to microgrid are preset the frequency variation and are limited
Value；
The determining submodule, for determining rotary inertia according to the fluctuation range of mains frequency.
Compared with prior art, the invention has the benefit that
Technical solution of the present invention calculates rotary inertia according to the fluctuation range of mains frequency；Based on the rotary inertia and
The rotary inertia adaptive control algorithm of preset virtual synchronous generator controls the virtual synchronous generator.It is real
Show that distributed generation resource is grid-connected with open arms, has reduced negative effect of the distributed generation resource to the high-quality operation of power grid security, improve
Receiving ability of the power grid to distributed generation resource.
Technical solution of the present invention by when power grid disturbs, virtual synchronous machine can responsive electricity grid fluctuation, have
Larger damping inhibits the power swing of power grid；After grid disturbance, virtual synchronous machine has smaller inertia, can be extensive rapidly
It is multiple, break through the VSG control of the permanent inertia of tradition.
Detailed description of the invention
Fig. 1 is the active loop control structure of the present invention；
Fig. 2 is rotary inertia auto-adaptive control theory of the invention；
Fig. 3 is VSC control and rotary inertia self adaptive control comparison of the invention；
Fig. 4 is that rotary inertia self adaptive control of the invention improves front and back comparison.
Specific embodiment
For a better understanding of the present invention, the contents of the present invention are done further with example with reference to the accompanying drawings of the specification
Explanation.
Technical solution of the present invention by when power grid disturbs, virtual synchronous machine can responsive electricity grid fluctuation, have
Larger damping inhibits the power swing of power grid；After grid disturbance, virtual synchronous machine has smaller inertia, can be extensive rapidly
It is multiple, break through the VSG control of the permanent inertia of tradition.And it is grid-connected with open arms to realize distributed generation resource, reduces distributed generation resource pair
The negative effect of the high-quality operation of power grid security improves power grid to the receiving ability of distributed generation resource.
A kind of control method of virtual synchronous generator, comprising:
Fluctuation range according to mains frequency calculates rotary inertia；
Rotary inertia adaptive control algorithm based on the rotary inertia and preset virtual synchronous generator, to described
Virtual synchronous generator is controlled.
Further, the rotary inertia based on the rotary inertia and preset virtual synchronous generator is self-adaptive controlled
Algorithm processed controls the virtual synchronous generator, comprising:
Rotary inertia adaptive control algorithm based on the preset virtual synchronous generator obtains inertia time constant
With rotary inertia relationship；
Influence by the rotary inertia to the inertia time constant slows down frequency fall off rate and realizes to the void
Quasi- synchronous generator is controlled.
Specifically,
In terms of the control angle of inverter, according to design control algolithm, inertia can be introduced on the basis of sagging control
Link simulates the inertia of synchronous generator, and inverter active control effect is made to be more closely similar to conventional synchronization generator, has tradition
The characteristics of synchronous generator primary frequency modulation and inertia, the active loop control structure of the VSG of design was as shown in Figure 1, and realizing
Cheng Zhong, J are set as constant, therefore traditional virtual synchronous machine control program is a kind of permanent rotary inertia control.
Technical solution employed in the invention are as follows:
Rotary inertia J is write as about frequency variation | f-50 | function, f be power grid real-time frequency, can be by adopting
Collection grid entry point mains voltage signal simultaneously carries out locking phase acquisition to it, and when frequency variation is greater than C, following formula formula is effective.
J=J0+kf|f-50| |f-50|≥C
In formula, J0Rotary inertia initial value (the kgm of oscillation of power is not generated for VSG investment microgrid moment2)；C is frequency
Variable quantity limit value allows frequency fluctuation range to set according to microgrid；kfFor frequency-tracking coefficient；F is frequency values.
The corresponding formula of rotary inertia self adaptive control is obtained from Fig. 2 are as follows:
In formula, J0Rotary inertia initial value (the kgm of oscillation of power is not generated for VSG investment microgrid moment2)；PrefTo have
Function command signal, P are real output signal, w0For power grid rated angular velocity, w is power grid actual angular speed, kfFor frequency with
Track coefficient, D are damped coefficient, kwFor power regulation factor.Then inertia time constant and active frequency droop coefficient are respectively as follows:
Wherein,It can be indicated with rotary inertia J.
From the above equation, we can see that: rotary inertia self adaptive control does not change active frequency droop coefficient, and it is normal only to influence inertia time
Number, rotary inertia self adaptive control slows down frequency fall off rate, but does not influence its variable quantity.
From figure 3, it can be seen that though frequency variation is slowed down using this control strategy, when to bring new problem be frequency retrieval
Between it is too long, if next time disturbance occur when frequency do not restore to rated value, then frequency can continue to change on this basis, it is possible to
Substantial deviation rated value.If using smaller rotary inertia in recovery process, frequency is restored rapidly to steady-state value, and the above problem is then not
It can occur.Rotary inertia J is divided into three kinds of situations and selected, when frequency f fluctuation does not occur, then selected by Given this problem
Original inertia J0,；When f fluctuation is larger, fluctuation difference is more than when setting constant C, then to increase accordingly inertia；When frequency f is presented reversely
When variation, then rotary inertia reverts to initial value；Rotary inertia self adaptive control selection is expressed as follows:
The comparison of rotary inertia self adaptive control and improved rotary inertia self adaptive control as can be seen from Figure 4, it is seen then that
Improved strategy restores frequency rapidly to rated value, solves the problems, such as that frequency retrieval is excessively slow, optimizes frequency retrieval curve.
It is that the active-frequency loop section structure block diagram of tradition VSG control is found out from Fig. 1, due to the active loop of synchronous inverter
It is corresponding with the mechanical motion equation of synchronous generator, therefore synchronous inverter simulates the mechanical electric of synchronous generator completely
Gas characteristic.Compared to the feature that conventional synchronization generator rotary inertia is fixed, rotation inertia parameter J is flexible in VSG control structure
It is variable, it is adapted to the control requirement of different capacity grade and adjustment speed.It is constant that inertia J is rotated in the control block diagram
Value, when the fluctuation of power grid emergent power, virtual synchronous equipment is for rotary inertia, but suitable rotary inertia value setting is more tired
Difficulty, if rotary inertia is excessive, after leading to disturbance, recovery time is longer；When rotary inertia is too small, to grid disturbance damping
Act on smaller, the inertia difficulty embodiment of virtual synchronous machine.
It is improved rotary inertia self adaptive control block diagram from Fig. 2, by rotary inertia self adaptive control, according to frequency w
The more appropriate inertia parameter of choice of fluctuation range, meet when power grid disturbs, virtual synchronous machine can have larger
Rotary inertia, to grid disturbance generate inhibiting effect, after disturbance, rotary inertia J reduce, virtual synchronous machine can with compared with
Fast speed is restored.
Another object of the present invention is to propose a kind of control system of virtual synchronous generator, comprising: computing module and
Control module；
Explanation is further explained to above-mentioned module below:
Computing module calculates rotary inertia for the fluctuation range according to mains frequency；
Control module, it is self-adaptive controlled for the rotary inertia based on the rotary inertia and preset virtual synchronous generator
Algorithm processed controls the virtual synchronous generator.
Computing module, comprising: analysis submodule；
Submodule is analyzed, calculates rotary inertia for the fluctuation range according to mains frequency, such as following formula:
Control module, comprising: setting submodule, default submodule and determining submodule；
Submodule is set, for presetting the rotary inertia self adaptive control of virtual synchronous generator；
Default submodule, the frequency fluctuation range for being allowed according to microgrid preset the frequency variation limit value；
Submodule is determined, for determining rotary inertia according to the fluctuation range of mains frequency.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above is only the embodiment of the present invention, are not intended to restrict the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent substitution, improvement and etc. done, be all contained in apply pending scope of the presently claimed invention it
It is interior.
Claims (10)
1. a kind of control method of virtual synchronous generator characterized by comprising
Fluctuation range according to mains frequency calculates rotary inertia；
Rotary inertia adaptive control algorithm based on the rotary inertia and preset virtual synchronous generator, to described virtual
Synchronous generator is controlled.
2. the control method of virtual synchronous generator as described in claim 1, which is characterized in that described used based on the rotation
The rotary inertia adaptive control algorithm of amount and preset virtual synchronous generator, controls the virtual synchronous generator
System, comprising:
Rotary inertia adaptive control algorithm based on the preset virtual synchronous generator obtains inertia time constant and turns
Dynamic inertia relationship；
Influence by the rotary inertia to the inertia time constant slows down frequency fall off rate and realizes to described virtual same
Step generator is controlled.
3. the control method of virtual synchronous generator as claimed in claim 2, which is characterized in that the preset virtual synchronous
The rotary inertia self adaptive control formula of generator are as follows:
In formula, J: rotary inertia, Pref: active command signal, P: real output signal, ω0: power grid rated angular velocity, ω:
Power grid actual angular speed, kf: frequency-tracking coefficient, D: damped coefficient, Kω: power regulation factor,The variation pair of frequency
Answer the variation of active power.
4. the control method of virtual synchronous generator as claimed in claim 3, which is characterized in that the preset virtual synchronous
The rotary inertia self adaptive control formula of generator further include: table is carried out using inertia time constant and active frequency droop coefficient
It reaches, expression formula is as follows:
In formula, τ ': inertia time constant, D 'P: active frequency droop coefficient.
5. the control method of virtual synchronous generator as claimed in claim 4, which is characterized in that the inertia time constant with
The relationship of rotary inertia such as following formula:
6. the control method of virtual synchronous generator as described in claim 1, which is characterized in that the foundation mains frequency
Fluctuation range calculates rotary inertia, such as following formula:
In formula, C: frequency variation limit value.
7. the control method of virtual synchronous generator as claimed in claim 6, which is characterized in that the frequency variation limits
Value, comprising:
The frequency variation limit value is preset according to the frequency fluctuation range that microgrid allows.
8. a kind of control system of virtual synchronous generator characterized by comprising computing module and control module；
The computing module calculates rotary inertia for the fluctuation range according to mains frequency；
The control module, it is self-adaptive controlled for the rotary inertia based on the rotary inertia and preset virtual synchronous generator
Algorithm processed controls the virtual synchronous generator.
9. the control system of virtual synchronous generator as claimed in claim 8, which is characterized in that the computing module, comprising:
Analyze submodule；
The analysis submodule calculates rotary inertia for the fluctuation range according to mains frequency, such as following formula:
10. the control system of virtual synchronous generator as claimed in claim 8, which is characterized in that the control module, packet
It includes: setting submodule, default submodule and determining submodule；
The setting submodule, for presetting the rotary inertia self adaptive control of virtual synchronous generator；
The default submodule, the frequency fluctuation range for being allowed according to microgrid preset the frequency variation limit value；
The determining submodule, for determining rotary inertia according to the fluctuation range of mains frequency.
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Application publication date: 20191008 |