CN109687741A  A kind of ThreePhase PWM Rectifier control method and system based on virtual synchronous machine  Google Patents
A kind of ThreePhase PWM Rectifier control method and system based on virtual synchronous machine Download PDFInfo
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 CN109687741A CN109687741A CN201910086190.6A CN201910086190A CN109687741A CN 109687741 A CN109687741 A CN 109687741A CN 201910086190 A CN201910086190 A CN 201910086190A CN 109687741 A CN109687741 A CN 109687741A
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Classifications

 H—ELECTRICITY
 H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
 H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
 H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
 H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
 H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
 H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
 H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
 H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
 H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
Abstract
The present invention discloses a kind of ThreePhase PWM Rectifier control method and system and obtains the operating parameter of AC network for any moment；Machine torque, excitation flux linkage and AC network angle revolving speed are calculated separately according to operating parameter；According to AC network angle revolving speed and virtual revolving speed calculating torque sag of chain；Electromagnetic torque is calculated according to threephase current, electrical angle and excitation flux linkage；New virtual revolving speed is calculated according to electromagnetic torque, machine torque and torque sag of chain, and using new virtual revolving speed as the feed back input value of subsequent time calculating torque sag of chain；New electrical angle is calculated according to new virtual revolving speed, and calculates the feed back input value of electromagnetic torque using new electrical angle as subsequent time；Virtual counter electromotive force is calculated according to new electrical angle, new virtual revolving speed and excitation flux linkage；Modulation wave signal is calculated according to virtual counter electromotive force.The present invention can be realized output voltage under steady state conditions and power stability follows setting value, and support is provided when power grid fluctuates.
Description
Technical field
The invention belongs to electric power system stability control technical fields, and in particular to a kind of threephase based on virtual synchronous machine
PWM rectifier control method and system.
Background technique
ThreePhase PWM Rectifier is the main electric power electronic device of load access power grid, there is energy to twoway circulate, specific work
The advantages that rate factor is run, output voltage and power are controllable mainly has direct Power Control and two kinds of DC voltage control controls
Scheme processed.However both control strategies cannot achieve support and demand response function to power grid, it is difficult to smart grid
Perfection docking.Load virtual synchronous machine technology is because that can realize load according to mains frequency and voltage realtime control bearing power
The friendly interaction with power grid and obtain extensive concern.Current research it is more be the virtual synchronous machine based on source side, for new
The energy generates electricity and network interface.Load side virtual synchronous machine mostly uses currentcontrol type virtual synchronous machine technology, the technical application
It is preferable in the effect of lowpower load, and when fluctuation or failure occur for power grid, it is difficult to the effect of competent voltage support.Cause
This must study voltagecontrolled type virtual synchronous machine technology to make load virtual synchronous machine technology be applied to largepower occasions.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, a kind of threephase PWM based on virtual synchronous machine is provided
Rectifier and system, can be realized output voltage under steady state conditions and power stability follows setting value, and in electricity
Net provides support when fluctuating.
To solve prior art problem, the ThreePhase PWM Rectifier control based on virtual synchronous machine that the invention discloses a kind of
Method, including the following contents:
For any moment,
The operating parameter of the AC network at current time is obtained, operating parameter includes threephase voltage, threephase current and electric angle
Degree；Turned according to the machine torque, excitation flux linkage and AC network angle that the operating parameter at current time calculates separately current time
Speed；The torque sag of chain at current time is calculated according to the AC network angle revolving speed at current time and virtual revolving speed；According to current
Threephase current, electrical angle and the excitation flux linkage at moment calculate the electromagnetic torque at current time；According to the electromagnetic torque at current time,
Machine torque and torque sag of chain calculate new virtual revolving speed, and new virtual revolving speed is sagging as subsequent time calculating torque
The feed back input value of amount, realization follow adjustment to mains frequency；New electrical angle is calculated according to new virtual revolving speed, and will be new
Electrical angle as subsequent time calculate electromagnetic torque feed back input value；According to new electrical angle, new virtual revolving speed and work as
The excitation flux linkage at preceding moment calculates the virtual counter electromotive force at current time；It is calculated according to the virtual counter electromotive force at current time current
The modulation wave signal of the control rectifier at moment.
Further,
The detailed process of the machine torque that current time is calculated according to the operating parameter at current time are as follows:
According to the threephase voltage at current time and threephase current computing system active power of output；
The reference active power set at current time and the difference of system active power of output are subjected to proportional integration
Operation obtains the machine torque at current time；Or
It is sampled to obtain DC side output voltage by DC voltage；
The difference of the reference DC voltage set at current time and DC side output voltage is subjected to proportional integration fortune
Calculation obtains the machine torque at current time.
Further,
The calculation formula of the system active power of output at the current time are as follows:
P=v_{a}i_{a}+v_{b}i_{b}+v_{c}i_{c}；
Wherein v_{a}、v_{b}、v_{c}For threephase voltage, i_{a}、i_{b}、i_{c}For threephase current；
The reference active power set and the difference of system active power of output are carried out ratio by the current time
Integral operation obtains the calculation formula of the machine torque at current time are as follows:
T_{m}=K_{p}(P_{ref}P)+K_{i}∫(P_{ref}P)dt；
Wherein, P_{ref}For with reference to active power, K_{p}For proportionality coefficient, K_{i}For integral coefficient；
The difference of the reference DC voltage set and DC side output voltage is carried out ratio product by the current time
Partite transport is calculated to obtain the calculation formula of the machine torque at current time are as follows:
T_{m}=K_{p}(V_{ref}V_{O})+K_{i}∫(V_{ref}V_{O})dt；
Wherein, V_{ref}For with reference to DC voltage, V_{O}For DC side output voltage.
Further,
The detailed process that excitation flux linkage is calculated according to the operating parameter at current time are as follows:
According to the threephase voltage at current time and threephase current computing system output reactive power；
The reference reactive power set at current time and the difference of system output reactive power are subjected to integral operation
Obtain excitation flux linkage.
Further,
The calculation formula of the system output reactive power are as follows:
Wherein v_{a}、v_{b}、v_{c}For threephase voltage, i_{a}、i_{b}、i_{c}For threephase current.
Further,
The detailed process that AC network angle revolving speed is calculated according to the operating parameter at current time are as follows:
The threephase voltage at current time is carried out locking phase to handle to obtain power grid angle revolving speed.
Further,
The torque sag of chain that current time is calculated according to the AC network angle revolving speed at current time and virtual revolving speed
Calculation formula are as follows:
Δ T=D_{p}(ωω_{s})；
Wherein, D_{p}For damped coefficient, ω is AC network angle revolving speed, ω_{s}For virtual revolving speed.
Further,
The meter of the electromagnetic torque that current time is calculated according to the threephase current at current time, electrical angle and excitation flux linkage
Calculate formula are as follows:
Wherein, M_{f}i_{f}For excitation flux linkage, i_{a}、i_{b}、i_{c}For threephase current, θ is electrical angle.
Further,
The calculating that new virtual revolving speed is calculated according to the electromagnetic torque at current time, machine torque and torque sag of chain
Formula are as follows:
Wherein, J is the rotary inertia of virtual synchronous machine rotatable parts, T_{e}For electromagnetic torque, T_{m}For machine torque, D_{p}For resistance
Buddhist nun's coefficient, ω are AC network angle revolving speed, ω_{s}For virtual revolving speed.
Further,
The new electrical angle of the basis, new virtual revolving speed and the excitation flux linkage at current time calculate the virtual of current time
The calculation formula of counter electromotive force are as follows:
Wherein, M_{f}i_{f}For excitation flux linkage,For virtual revolving speed, θ is electrical angle；When system is in stable state, i_{f}For constant value,
Further,
The initial value of the electromagnetic torque at the current time is default value.
Further,
The initial value of the electrical angle at the current time is default value.
Correspondingly, the present invention also provides a kind of ThreePhase PWM Rectifier control systems based on virtual synchronous machine, comprising:
Sampling module, the operating parameter of the AC network for obtaining current time, operating parameter include threephase voltage, three
Phase current and electrical angle；
Machine torque computing module, for calculating the machine torque at current time according to the operating parameter at current time；
Excitation flux linkage computing module, for calculating the excitation flux linkage at current time according to the operating parameter at current time；
AC network angle revolving speed computing module, for calculating the exchange at current time according to the operating parameter at current time
Power grid angle revolving speed；
Torque sag of chain computing module, for being worked as according to the AC network angle revolving speed at current time and the calculating of virtual revolving speed
The torque sag of chain at preceding moment；
Virtual revolving speed computing module, for being calculated according to the electromagnetic torque at current time, machine torque and torque sag of chain
New virtual revolving speed, and using new virtual revolving speed as the feed back input value of subsequent time calculating torque sag of chain；
Electric angle calculation module, for calculating new electrical angle according to new virtual revolving speed, and using new electrical angle as
The feed back input value of subsequent time calculating electromagnetic torque；
Core calculation module calculates separately the electromagnetic torque and void at current time for the operating parameter according to current time
Quasi counter electromotive force；And
Modulation module, the modulation of the control rectifier for calculating current time according to the virtual counter electromotive force at current time
Wave signal.
The invention has the benefit that can be realized output voltage and power stability under steady state conditions follows setting
Value, and support is provided when power grid fluctuates.
Detailed description of the invention
Fig. 1 is ThreePhase PWM Rectifier main circuit topological structure figure in the present invention；
Fig. 2 is the control block diagram (direct Power Control scheme) of a preferred embodiment of the invention；
Fig. 3 is the control block diagram (DC constant voltage control program) of another preferred embodiment of the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, a kind of ThreePhase PWM Rectifier main circuit uses three phase full bridge topological structure, including AC network, friendship
Flow input impedance, threephase rectification bridge and load.Threephase alternating current is after Ltype filter circuit filters out highfrequency interferencing signal as rectification
The input signal of circuit, output voltage use bulky capacitor pressure stabilizing, load using resistive load.
Wherein, v_{a}、v_{b}、v_{c}For threephase voltage, i_{a}、i_{b}、i_{c}It is also threephase current for the input current of rectifier, R_{S}And L_{S}Point
Not Wei AC network equivalent resistance and inductance, Q_{1}~Q_{6}For 6 insulated gate bipolar transistors containing antiparallel diodes
(IGBT), C is DC side electric capacity of voltage regulation, and R is load resistance, V_{O}For DC side output voltage.According to the physical model of synchronous machine,
It can do following equivalent: v_{a}、v_{b}、v_{c}It is equivalent to the end voltage of synchronous motor, R_{S}And L_{S}It is equivalent to stator of synchronous motor winding
Resistance and inductance, e_{a}、e_{b}、e_{c}It is equivalent to the counter electromotive force that synchronous motor is generated due to rotor rotation, just realizes three in this way
Phase PWM rectifier and synchronous motor are equivalent on circuit.
According to the armature equation of synchronous motor it is found that end voltage v=[v_{a} v_{b} v_{c}]^{T}It can be obtained by formula (1):
Wherein e=[e_{a} e_{b} e_{c}]^{T}For the counter electromotive force of synchronous motor, i=[i_{a} i_{b} i_{c}] it is the three of synchronous motor
Phase input current, counter electromotive force e can be described with equation (2):
Electrical angle of the θ between excitation winding and stator winding, Respectively as formula (3) and (4) indicate:
The activepower P and reactive power Q of system output can be described with formula (5) and formula (6):
P=vai_{a}+vbi_{b}+vci_{c}(5)；
Meanwhile the mechanical part of synchronous motor can be described with formula (7):
Wherein, J is the rotary inertia of rotatable parts, T_{e}For electromagnetic torque, T_{m}For machine torque, D_{p}For damped coefficient, ω is
AC network angle revolving speed, ω_{s}It, can Tracking Frequency of Power Grids in real time for virtual revolving speed.
Electromagnetic torque T_{e}It can be calculated and be obtained by formula (8):
Wherein,<,>indicate dot product operation.
Embodiment one
As shown in Fig. 2, the direct Power Control method of the ThreePhase PWM Rectifier based on virtual synchronous machine, including it is following interior
Hold:
For any moment, active loop section uses PI controller, may be implemented to reference activepower P_{ref}Floating
Follow, with reference to input of the difference DELTA P as PI controller of active power and system active power of output P, PI controller it is defeated
It is out machine torque T_{m}, specific formula for calculation are as follows:
T_{m}=K_{p}(P_{ref}P)+K_{i}∫(P_{ref}P)dt；
Wherein, P_{ref}For with reference to active power, K_{p}For the proportionality coefficient of PI controller, K_{i}For the integral coefficient of PI controller.
System active power of output P substitutes into formula (5) by the current electric grid operating parameter that will be got in real time and is calculated, and reference is active
Power P_{ref}For default value.
Electromagnetic torque subtracts machine torque and by damped coefficient D_{p}The torque sag of chain of introducing is as input gain
Integrator input, by formula (7) it is found that the output of the integrator be new system virtualization rotational speed omega s, by new system virtualization
Feed back input value of the rotational speed omega s as subsequent time calculating torque sag of chain.By the closedloop control of active ring, virtual revolving speed can
To follow mains frequency well, when mains frequency fluctuates, timely adjustment can be made.System virtualization rotational speed omega_{s}'s
Initial value is setting value, when new virtual rotational speed omega_{s}It is updated immediately after calculating and is used as subsequent time calculating torque sag of chain
Feed back input value.
Idle loop section uses negative gainIntegrator, reactive power Q will be referred to_{ref}With system output reactive power Q's
Input of the difference DELTA Q as integrator, the output of integrator are excitation flux linkage M_{f}i_{f}, specific formula for calculation are as follows:
Wherein, K is the antithesis amount of rotary inertia J.System output reactive power Q passes through the current electric grid that will get in real time
Operating parameter substitutes into formula (6) and is calculated, with reference to reactive power Q_{ref}For default value.If wanting that system is made to run on high power
Under factor, then set with reference to reactive power Q_{ref}It is 0；If power grid needs reactive compensation because of lowvoltage, it is arranged with reference to idle function
Rate be analog value realize quick voltage support, specifically, when network voltage fluctuates between 90%~100%, setting so that
Virtual synchronous machine issues lagging reactive power to power grid, and setting value and active power summation are no more than place capacity.
From formula (8) it is found that electromagnetic torque T_{e}By virtual excitation flux linkage M_{f}i_{f}, power grid phase current i, excitation winding and stator around
What the electrical angle θ between group was codetermined.The new virtual rotational speed omega that will be calculated in active ring_{s}Integral can be obtained new again
Electrical angle θ, its calculation formula is:
θ=∫ ω_{S}dt。
By virtual excitation flux linkage M_{f}i_{f}, power grid phase current i and new electrical angle θ substitute into formula (8) and new virtual electricity be calculated
Magnetic torque T_{e}.The initial value of electrical angle θ is setting value, and value passes through threephase phaselocked loop locking system phase and current time power grid
Phase is identical to be obtained, when passing through new virtual rotational speed omega_{s}After new electrical angle θ is calculated, under which is used as
The feed back input value of one moment calculating electromagnetic torque.
By formula (2) it is found that the counter electromotive force e of virtual synchronous machine is by virtual excitation flux linkage M_{f}i_{f}It is codetermined with electrical angle θ,
When system is in stable state, i_{f}For constant value, formula (2) is reduced to formula (9):
By the virtual excitation flux linkage M at current time_{f}i_{f}The void that the current moment is calculated in formula (9) is substituted into new electrical angle θ
Quasi counter electromotive force e.The virtual counter electromotive force e at current moment is modulated to the threephase PWM rectification that the current moment is obtained after processing
The PWM modulation wave of device.
Based on inventive concept same as the above method, the present invention also provides a kind of threephases based on virtual synchronous machine
PWM rectifier control system, comprising: sampling module, machine torque computing module, excitation flux linkage computing module, AC network angle
Spend revolving speed computing module, AC network angle revolving speed computing module, torque sag of chain computing module, virtual revolving speed computing module,
Electric angle calculation module, core calculation module and modulation module.
Sampling module is used to obtain the operating parameter of the AC network at current time, and operating parameter includes threephase voltage, three
Phase current and electrical angle.
The core cell of machine torque computing module be PI arithmetic unit, by according to the operating parameter at current time respectively based on
Calculate the machine torque at current time.
The core cell of excitation flux linkage computing module is that gain isIntegrator, for the operation according to current time
Parameter calculates separately the excitation flux linkage at current time.
The core cell of AC network angle revolving speed computing module is threephase phaselocked loop, for the operation according to current time
Parameter calculates separately the AC network angle revolving speed at current time.AC network angle revolving speed computing module is gone back at regular intervals
It exports a reset signal to reset it to electric angle calculation module, be saturated to avoid AC network angle revolving speed computing module,
It is preferred that the output period is 2 π.
The core cell of torque sag of chain computing module is D_{p}Arithmetic unit, for the AC network angle according to current time
Revolving speed and virtual revolving speed calculate the torque sag of chain at current time.
The core cell of virtual revolving speed computing module is that gain isIntegrator, for according to the electromagnetism at current time turn
Square, machine torque and torque sag of chain calculate new virtual revolving speed, and using new virtual revolving speed as subsequent time calculating torque
The feed back input value of sag of chain.
The core cell of electric angle calculation module is revolving speed integrator, for calculating new electric angle according to new virtual revolving speed
Degree, and using new electrical angle as the feed back input value of subsequent time calculating electromagnetic torque.
Core calculation module is used to be worked as according to new electrical angle, new virtual revolving speed and the calculating of the excitation flux linkage at current time
The virtual counter electromotive force at preceding moment in the present embodiment, is also used to be exported according to the operating parameter computing system at current time active
Power and system output reactive power and according to the threephase current at current time, electrical angle and excitation flux linkage calculate current time
Electromagnetic torque.
The core cell of modulation module is PWM modulator, current for being calculated according to the virtual counter electromotive force at current time
The modulation wave signal of the control rectifier at moment.
Embodiment two
As shown in figure 3, the present embodiment and embodiment one the difference is that, in the present embodiment, control mode is direct current
Isobarically Control, active ring are Voltage loop, pass through the current DC side output voltage V got_{O}It is encouraged with the calculating of reference DC voltage
Magnetic magnetic linkage, detailed process are as follows: sampled to obtain DC side output voltage by DC voltage；By the reference DC voltage set and
The difference of DC side output voltage carries out proportional integration operation and obtains machine torque, its calculation formula is:
T_{m}=K_{p}(V_{ref}V_{O})+K_{i}∫(V_{ref}V_{O})dt；
Wherein, V_{ref}For with reference to DC voltage, V_{O}For DC side output voltage.
Based on inventive concept same as the above method, the present invention also provides a kind of threephases based on virtual synchronous machine
PWM rectifier control system, comprising: sampling module, machine torque computing module, excitation flux linkage computing module, AC network angle
Spend revolving speed computing module, AC network angle revolving speed computing module, torque sag of chain computing module, virtual revolving speed computing module,
Electric angle calculation module, core calculation module and modulation module.
Sampling module is used to obtain the operating parameter of the AC network at current time, and operating parameter includes threephase voltage, three
Phase current and electrical angle.
The core cell of machine torque computing module be PI arithmetic unit, by according to the operating parameter at current time respectively based on
Calculate the machine torque at current time.
The core cell of excitation flux linkage computing module is that gain isIntegrator, for the operation according to current time
Parameter calculates separately the excitation flux linkage at current time.
The core cell of AC network angle revolving speed computing module is threephase phaselocked loop, for the operation according to current time
Parameter calculates separately the AC network angle revolving speed at current time.AC network angle revolving speed computing module is gone back at regular intervals
It exports a reset signal to reset it to electric angle calculation module, be saturated to avoid AC network angle revolving speed computing module,
It is preferred that the output period is 2 π.
The core cell of torque sag of chain computing module is D_{p}Arithmetic unit, for the AC network angle according to current time
Revolving speed and virtual revolving speed calculate the torque sag of chain at current time.
The core cell of virtual revolving speed computing module is that gain isIntegrator, for according to the electromagnetism at current time turn
Square, machine torque and torque sag of chain calculate new virtual revolving speed, and using new virtual revolving speed as subsequent time calculating torque
The feed back input value of sag of chain.
The core cell of electric angle calculation module is revolving speed integrator, for calculating new electric angle according to new virtual revolving speed
Degree, and using new electrical angle as the feed back input value of subsequent time calculating electromagnetic torque.
Core calculation module is used to be worked as according to new electrical angle, new virtual revolving speed and the calculating of the excitation flux linkage at current time
The virtual counter electromotive force at preceding moment in the present embodiment, is also used to be exported according to the operating parameter computing system at current time idle
Power and the electromagnetic torque that current time is calculated according to the threephase current at current time, electrical angle and excitation flux linkage.This implementation
In example, DC side output voltage V_{O}To collect, without being calculated.
The core cell of modulation module is PWM modulator, current for being calculated according to the virtual counter electromotive force at current time
The modulation wave signal of the control rectifier at moment.
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, CDROM, 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 computerreadable 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 a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (13)
1. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine, it is characterised in that: including the following contents:
For any moment,
The operating parameter of the AC network at current time is obtained, operating parameter includes threephase voltage, threephase current and electrical angle；
Turned according to the machine torque, excitation flux linkage and AC network angle that the operating parameter at current time calculates separately current time
Speed；
The torque sag of chain at current time is calculated according to the AC network angle revolving speed at current time and virtual revolving speed；
The electromagnetic torque at current time is calculated according to the threephase current at current time, electrical angle and excitation flux linkage；
Calculate new virtual revolving speed according to the electromagnetic torque at current time, machine torque and torque sag of chain, and will be new virtual
Feed back input value of the revolving speed as subsequent time calculating torque sag of chain, realization follow adjustment to mains frequency；
New electrical angle is calculated according to new virtual revolving speed, and calculates the antiof electromagnetic torque for new electrical angle as subsequent time
Present input value；
The virtual antielectronic of current time is calculated according to new electrical angle, new virtual revolving speed and the excitation flux linkage at current time
Gesture；
The modulation wave signal of the control rectifier at current time is calculated according to the virtual counter electromotive force at current time.
2. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 1, feature exist
In:
The detailed process of the machine torque that current time is calculated according to the operating parameter at current time are as follows:
According to the threephase voltage at current time and threephase current computing system active power of output；
The reference active power set at current time and the difference of system active power of output are subjected to proportional integration operation
Obtain the machine torque at current time；Or
It is sampled to obtain DC side output voltage by DC voltage；
The progress proportional integration operation of the difference of the reference DC voltage set at current time and DC side output voltage is obtained
To the machine torque at current time.
3. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 2, feature exist
In:
The calculation formula of the system active power of output at the current time are as follows:
P=v_{a}i_{a}+v_{b}i_{b}+v_{c}i_{c}；
Wherein v_{a}、v_{b}、v_{c}For threephase voltage, i_{a}、i_{b}、i_{c}For threephase current；
The reference active power set and the difference of system active power of output are carried out proportional integration by the current time
Operation obtains the calculation formula of the machine torque at current time are as follows:
T_{m}=K_{p}(P_{ref}P)+K_{i}∫(P_{ref}P)dt；
Wherein, P_{ref}For with reference to active power, K_{p}For proportionality coefficient, K_{i}For integral coefficient；
The difference of the reference DC voltage set and DC side output voltage is carried out proportional integration fortune by the current time
It calculates and obtains the calculation formula of the machine torque at current time are as follows:
T_{m}=K_{p}(V_{ref}V_{O})+K_{i}∫(V_{ref}V_{O})dt；
Wherein, V_{ref}For with reference to DC voltage, V_{O}For DC side output voltage.
4. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 1, feature exist
In:
The detailed process that excitation flux linkage is calculated according to the operating parameter at current time are as follows:
According to the threephase voltage at current time and threephase current computing system output reactive power；
The reference reactive power set at current time and the difference of system output reactive power are carried out integral operation to obtain
Excitation flux linkage.
5. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 4, feature exist
In:
The calculation formula of the system output reactive power are as follows:
Wherein v_{a}、v_{b}、v_{c}For threephase voltage, i_{a}、i_{b}、i_{c}For threephase current.
6. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 1, feature exist
In:
The detailed process that AC network angle revolving speed is calculated according to the operating parameter at current time are as follows:
The threephase voltage at current time is carried out locking phase to handle to obtain power grid angle revolving speed.
7. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 1, feature exist
In:
The meter of the torque sag of chain that current time is calculated according to the AC network angle revolving speed at current time and virtual revolving speed
Calculate formula are as follows:
Δ T=D_{p}(ωω_{s})；
Wherein, D_{p}For damped coefficient, ω is AC network angle revolving speed, ω_{s}For virtual revolving speed.
8. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 1, feature exist
In:
The calculating of the electromagnetic torque that current time is calculated according to the threephase current at current time, electrical angle and excitation flux linkage is public
Formula are as follows:
Wherein, M_{f}i_{f}For excitation flux linkage, i_{a}、i_{b}、i_{c}For threephase current, θ is electrical angle.
9. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 1, feature exist
In:
The calculation formula that new virtual revolving speed is calculated according to the electromagnetic torque at current time, machine torque and torque sag of chain
Are as follows:
Wherein, J is the rotary inertia of virtual synchronous machine rotatable parts, T_{e}For electromagnetic torque, T_{m}For machine torque, D_{p}For damping system
Number, ω are AC network angle revolving speed, ω_{s}For virtual revolving speed.
10. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 1, feature exist
In:
The new electrical angle of the basis, new virtual revolving speed and the excitation flux linkage at current time calculate the virtual antielectricity at current time
The calculation formula of kinetic potential are as follows:
Wherein, M_{f}i_{f}For excitation flux linkage,For virtual revolving speed, θ is electrical angle；When system is in stable state, i_{f}For constant value,
11. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 1, feature exist
In:
The initial value of the electromagnetic torque at the current time is default value.
12. a kind of ThreePhase PWM Rectifier control method based on virtual synchronous machine according to claim 1, feature exist
In:
The initial value of the electrical angle at the current time is default value.
13. a kind of ThreePhase PWM Rectifier control system based on virtual synchronous machine, it is characterised in that: include:
Sampling module, the operating parameter of the AC network for obtaining current time, operating parameter include threephase voltage, threephase electricity
Stream and electrical angle；
Machine torque computing module, for calculating the machine torque at current time according to the operating parameter at current time；
Excitation flux linkage computing module, for calculating the excitation flux linkage at current time according to the operating parameter at current time；
AC network angle revolving speed computing module, for calculating the AC network at current time according to the operating parameter at current time
Angle revolving speed；
Torque sag of chain computing module, when for calculating current according to the AC network angle revolving speed at current time and virtual revolving speed
The torque sag of chain at quarter；
Virtual revolving speed computing module, for being calculated newly according to the electromagnetic torque at current time, machine torque and torque sag of chain
Virtual revolving speed, and using new virtual revolving speed as the feed back input value of subsequent time calculating torque sag of chain；
Electric angle calculation module, for calculating new electrical angle according to new virtual revolving speed, and using new electrical angle as next
The feed back input value of moment calculating electromagnetic torque；
Core calculation module calculates separately the electromagnetic torque at current time and virtual antifor the operating parameter according to current time
Electromotive force；And
Modulation module is believed for calculating the modulating wave of control rectifier at current time according to the virtual counter electromotive force at current time
Number.
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CN110994617A (en) *  20191213  20200410  国电南瑞南京控制系统有限公司  Current harmonic suppression method for virtual synchronous machine and control system of virtual synchronous machine 
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