CN104993521B - Energy storage method based on virtual synchronous inversion control - Google Patents
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Abstract
The invention discloses a kind of energy storage method based on virtual synchronous inversion control, solve the problems, such as power electronics energy-storage system zero rotary inertia.Because converters system has zero moment of inertia characteristics, grid disturbances and frequency disturbance can cause to have a strong impact on to the control performance of energy-storage system, shorten the energy-storage system life-span, jeopardize power electronics energy storage device and power system security.The present invention adopts virtual synchronous electric machines control technology, making the external characteristics of the exchange interface of the energy storage device with power electronic system can be equivalent to synchronous motor characteristic, thus improving inertia and the damping characteristic of power electronics energy-storage system, strengthening the stability of power system.
Description
Technical field
The present invention relates to intelligent grid, particularly a kind of energy storage method based on virtual synchronous inversion control.
Background technology
Because power electronic equipment does not almost have rotary inertia and damping characteristic, consider energy-storage system from two kinds of angles
The problem of discharge and recharge.
From the point of view of electrical network, set up and improve a kind of electrical network form intelligence more friendly to generation of electricity by new energy
Electrical network, can solve the problems, such as generation of electricity by new energy well.Topmost two features of intelligent grid are exactly intelligent and big rule
Mould utilizes regenerative resource.In following intelligent grid, AC network is as the main power transmission mode of power system, direct current transportation
As the important useful supplement of ac transmission.Compared to AC network, direct current network is more friendly to generation of electricity by new energy.Small-sized
The place concentrated of distributed power generation (referring mainly to wind-power electricity generation and photovoltaic generation) small-sized DC distribution net can be set up, finally
It is incorporated to large-scale ac transmission network after unified inversion.Due to the access of extensive new forms of energy equipment, energy storage device is also following intelligence
Can the indispensable necessaries of electrical network.Building intelligent grid is an essential measure solving new energy power generation grid-connection.
From the point of view of inverter, the transformation of AC network and development occur in that another kind of thinking.Traditional bulk power grid
TRT (thermal power generation, hydroelectric generation etc.) be manufactured almost exclusively by synchronous generator generate electricity, if the inverter in distribution from
Net side is looked and can be presented the operation characteristic of synchronous generator, then just can be well compatible with traditional electrical network.For this reason, it may be necessary to
Inverter is transformed so as to assume the characteristic of synchronous generator as viewed from net side, thus the stability of electrical network of increasing exchanges.
Based on the virtual synchronous inversion controlling method of energy-storage system, according to the electromagnet inertia of synchronous generator, to inverter
It is controlled, more can reflect the characteristic of synchronous generator.The electromagnetic property of synchronous generator is simulated, rotor is used in controller
Property, primary frequency modulation and excitation voltage adjustment characteristic, more can simulate the characteristic of synchronous generator from external characteristics, and due to idle, have
There is integral element in work(control section, can achieve that idle, active indifference controls, and can substantially improve system stability.
Content of the invention
It is an object of the invention to provide a kind of energy-storage system based on virtual synchronous inversion control and its control method, should
When battery charges, inverter adopts the control strategy of virtual synchronous inversion transformation technique to system, can improve inertia and the damping of system
Characteristic, the stability of strengthening system.
The technical solution of the present invention is as follows:
A kind of energy-storage system based on virtual synchronous inversion control, its feature is, comprise battery, DC/DC changer,
DC/AC changer, transformator, AC network, the first controller and second controller;
Described battery is connected with the input of DC/DC changer, the described outfan of DC/DC changer with described
The input of DC/AC changer is connected, and the outfan of this DC/AC changer is connected with the low pressure, input end of described transformator,
The high-voltage output end of described transformator is connected with AC network;
The described outfan of the first controller is connected with the control end of described DC/DC changer, the first controller
Input is connected with the outfan of DC/DC changer, the control of the described outfan of second controller and DC/AC changer
End is connected, and the input of second controller is connected with the outfan of described DC/AC changer;
The first described controller includes first comparator and a PI controller, the output termination of this first comparator the
The input of one PI controller;
Described second controller includes virtual synchronous inversion control, Power Control, current control, voltage coordinate modulus of conversion
Block, electric current coordinate transferring and inverse coordinate transferring six part, described virtual synchronous inversion control part includes machinery
Partly, excitation system, angular transition module and electric part;
Described mechanical part outfan connects the described input of angular transition module respectively and described inverse coordinate turns
The input of die change block, the outfan of described angular transition module connects the input of described voltage coordinate modular converter respectively
With the input of electric current coordinate transferring, the described electric part of the output termination of described voltage coordinate modular converter defeated
Enter end, the output of described excitation system terminates the input of described electric part, and the output of described electric part terminates
The input of described current control, the input of the described current control of the output termination of described Power Control, described electricity
The input of the inverse coordinate transferring described in output termination of flow control;
The second comparator that described mechanical part includes being sequentially connected, the 3rd comparator, hypothetical rotor inertial element,
One adder and first integrator, the outfan of described hypothetical rotor inertial element connects described second through tune difference feedback element
Second input of comparator;
Described excitation system includes the 4th comparator, virtual magnetizing exciter and the first compensator, described virtual magnetizing exciter
Outfan connect the second input of the 4th comparator through the first described compensator;
Described power control section is divided including the 5th comparator and the 2nd PI controller, the 6th comparator and the 3rd PI control
Device;
Described current control division divides including the control of d axle component and the control of q axle component, and described d axle component controls inclusion
Second adder, the 7th comparator and the 4th PI controller, described q axle component controls and includes the 3rd adder, the 8th compares
Device and the 5th PI controller.
The first described controller and second controller are digital signal processor, single-chip microcomputer or computer.
Described DC/DC changer is high-power, wide output voltage range DC converter.
Described DC/AC changer is the Comprehensive Control being combined using virtual synchronous inversion control and conventional power control
The direct current of algorithm becomes the changer of exchange, realizes whole energy-storage system is equivalent in terms of net side the mesh of a synchronous generator
, the adaptively voltage of responsive electricity grid and frequency disturbance, the inertial properties of strengthening system and damping characteristic.
Using the control method of the described energy-storage system based on virtual synchronous inversion control, its feature is, the method
Including following content and step:
1) initialize, in this energy-storage system, following parameter value is set according to system requirements by operator:
The DC bus-bar voltage reference value of DC/AC changer
Electromagnetic power reference value P of energy-storage systemref;
Reactive power reference qref Q of energy-storage systemref;
Set difference coefficient R as between 30-50, inertia constant M as between 1-20, load-damping constant D as 1% or
2%;
Set hypothetical rotor xqImpedance x with statordIt is between 1-10;
AC voltage reference value Uref, per unit value is set to 1;
Set the gain K of the first compensator of excitation systemfWith time constant TfBetween 0-1, the gain K of excitation systema
Between 100-500, excitation system time constant TeBetween 0-1, upper limit E of excitation voltage amplitudefmax0-15 it
Between, the lower limit E of excitation voltage amplitudefmin=-Efmax;
Set the hypothetical rotor transient state impedance x ' of electric partdSpan between 0.1-0.5, the resistance of the transient state of stator
Anti- x 'qSpan between 0.3-1, the transient state open circuit time constant T of d axled′oSpan between 1.5-10, q axle
Transient state open circuit time constant T 'qoSpan between 0.5-2.0;
The control coefrficient of the first PI controller is kp1And ki1, 0<kp1<1000,0<ki1<1000;
The control coefrficient of the 2nd PI controller is kp2And ki2, 0<kp2<1000,0<ki2<1000;
The control coefrficient of the 3rd PI controller is kp3And ki3, 0<kp3<1000,0<ki3<1000;
The control coefrficient of the 4th PI controller is kp4And ki4, 0<kp4<1000,0<ki4<1000;
The control coefrficient of the 5th PI controller is kp5And ki5, 0<kp5<1000,0<ki5<1000;
Using Hall element, DC voltage, AC voltage and current are sampled, obtain DC/DC changer
(2) output end voltage Udc, unit is per unit value, and grid side three-phase voltage ea, eb, ecWith grid side three-phase current ia,
ib, ic;
2), the first controller executes according to the following steps:
21), first comparator calculates the input value of a PI controller:
22), a PI controller is calculated after the output receiving above-mentioned first comparator, and output is corresponding to be controlled
Amount:
3) mechanical part of the virtual synchronous inversion control of second controller (7) executes according to the following steps:
31), following equation is pressed by the second comparator and calculate virtual machine power Pm:
Wherein, PrefIt is the electromagnetic power reference value setting, R is difference coefficient, Δ ω is hypothetical rotor offsetFor the output of hypothetical rotor inertial element, M is the inertia constant in hypothetical rotor inertial element, and D is void
Intend the load-damping constant in rotor inertia link, s is complex frequency, the initial value of Δ ω is set to zero;
32), pass through virtual accelerating power P of the 3rd comparator calculating machine parta:
Pa=Pm-Pe, wherein PeFor the electromagnetic power of mechanical part, Pe=eaia+ebib+ecic;
33), calculating angular velocity by first adder is:ω=ω0+ Δ ω, ω0For the initial value of angular velocity, work as electrical network
Frequency is 50Hz, then ω0=2 × π × 50=314rad/s;
34), synchronous angle is calculated by first integrator:θ=∫ ω;θ is the input of angular transition module;
35), angle compensation is carried out by angular transition module, formula is as follows:
Wherein, θ ' is lock phase angle;I is power network current amplitude;egFor grid voltage amplitude;xqFor hypothetical rotor impedance;
4), the excitation system of second controller virtual synchronous inversion control executes according to the following steps:
41), pass through input quantity U that the 4th comparator calculates virtual magnetizing excitert, formula is as follows:
Ut=Uref-Ux
Wherein:UrefFor the AC magnitude of voltage setting, KfAnd TfGain for the first compensator and time constant;UxFor
The output of one compensator;
42) the input virtual excitation voltage E of electric part, is calculated by virtual magnetizing exciterf, formula is as follows:
Wherein:KaAnd TeIt is respectively gain and the time constant of virtual magnetizing exciter, EfmaxAnd EfminIt is respectively virtual magnetizing exciter
Voltage magnitude upper and lower bound;
43), pass through the first compensator and calculate Ux, formula is as follows:
5), voltage coordinate conversion module and electric current coordinate transformation module execute according to the following steps:
51), by ea、ebAnd ecCalculate line voltage d-q component U through voltage coordinate conversion moduledAnd Uq, formula is as follows:
52), by ia、ibAnd icCalculate line voltage d-q component i through electric current coordinate transformation moduledAnd iq, formula is as follows:
6), the electric part of second controller virtual synchronous inversion control executes according to the following steps:
61), calculating current is with reference to Idref1And Iqref1, formula is as follows:
Wherein:UdAnd UqIt is the d-q component of line voltage;Idref1And Iqref1It is described DC/AC changer (3) output electricity
The virtual stator current part of stream, EfIt is virtual excitation voltage;
7), second controller Power Control part executes according to the following steps:
71) input of the 2nd PI controller, is calculated by the 5th comparator:Pref-Pe;
72), the 2nd PI controller is controlled computing after the output receiving above-mentioned 5th comparator, and output is corresponding
Controlled quentity controlled variable Idref2:Idref2=kp2(Pref-Pe)+ki2∫(Pref-Pe)dt;It is the input of current control part;
73) input of the 3rd PI controller, is calculated by the 6th comparator:Qref-Qe;
74), the 3rd PI controller is controlled computing after the output receiving above-mentioned 6th comparator, and output is corresponding
Controlled quentity controlled variable Iqref2:
Iqref2=kp3(Qref-Qe)+ki3∫(Qref-Qe)dt;It is the input of current control part;
8), the d axle component of second controller (7) current control part controls and executes according to the following steps:
81), calculate d shaft current reference value Idref, formula is as follows:
Idref=Idref1+Idref2;
82) input of the 4th PI controller, is calculated by the 7th comparator:Idref-Id;IdDivide for three-phase current d axle
Amount, by ia、ibAnd icThrough coordinate transform output;
83), the 4th PI controller is controlled computing after the output receiving above-mentioned 7th comparator, and output is corresponding
Obtain controlled quentity controlled variable Udref:Udref=kp4(Idref-Id)+ki4∫(Idref-Id)dt;
9), the q axle component of second controller current control part controls and executes according to the following steps:
91), calculate q shaft current reference value Iqref, formula is as follows:
Iqref=Iqref1+Iqref2;
92) input of the 5th PI controller, is calculated by the 8th comparator:Iqref-Iq;IqDivide for three-phase current q axle
Amount, by ia、ibAnd icThrough coordinate transform output;
93), the 5th PI controller is controlled computing after the output receiving above-mentioned 8th comparator, and output is mutually deserved
Controlled quentity controlled variable Uqref:Uqref=kp5(Iqref-Iq)+ki5∫(Iqref-Iq)dt;
10), second controller output:
101), by the U being obtaineddrefAnd UqrefThrough the conversion of inverse coordinate transformation module, obtain Uaref、UbrefAnd UcrefThree tune
Ripple processed, using these three amounts as control signal with carrier wave ratio relatively, obtains the control signal of DC/AC changer (3), and formula is as follows:
The technique effect of the present invention is as follows:
In present system, and the DC/AC inverter of grid side connection adopts the control method of virtual synchronous inversion transformation technique,
Support and voltage support to the necessary frequency of electrical network, improve the stability of system.Its feature is as follows:
1st, because the external characteristics that power electronic system exchanges interface is equivalent to synchronous generator characteristic so that accumulator charge and discharge
Electrical interface equipment can participate in electrical network interaction, provide necessary support to line voltage and frequency, can improve grid stability.
2., using having high power transmission ability, wide output voltage range DC/DC changer, the sound of system can be improved
Answer speed and control accuracy.
Brief description
Fig. 1 is the entire block diagram of the energy-storage system based on virtual synchronous inversion transformation technique for the present invention.
Fig. 2 is virtual synchronous inversion control entirety control block diagram.
Fig. 3 is mechanical part control block diagram.
Fig. 4 is Excitation Controller block diagram.
Fig. 5 is the first controller control block diagram.
Fig. 6 is second controller Power Control block diagram.
Fig. 7 is second controller current control block diagram.
Fig. 8 is angular transition module
Fig. 9 is system control process figure.
Specific embodiment
With reference to embodiment and accompanying drawing, the invention will be further described, and nitrogen should not limit the protection model of the present invention with this
Enclose.
Refer to Fig. 1, Fig. 1 be the energy-storage system schematic diagram based on virtual synchronous inversion transformation technique for the present invention, comprise battery 1,
DC/DC changer 2, DC/AC changer 3, transformator 4, AC network 5, the first controller 6 and second controller 7, in detailed below
Introduce each ingredient:
Described battery 1 is to provide energy stores and the equipment of energy output for energy-storage system;
DC/DC changer 2 is high-power, wide output voltage range changer;
DC/AC changer 3 controls, using the control method of virtual synchronous inversion transformation technique and conventional power, the synthesis combining
Control algolithm, realizes whole energy-storage system is equivalent in terms of net side the purpose of a synchronous generator, adaptively responds electricity
The voltage of net and frequency disturbance, the inertial properties of strengthening system and damping characteristic.
First controller 6 is responsible for sampling, process, calculating and control of DC/DC changer 2 etc.;
Second controller 7 is responsible for data sampling, process, calculating and control etc., and the DC/AC changer 3 of net side is controlled
System.
Described battery 1 is connected with the input of DC/DC changer 2, the described outfan of DC/DC changer 2 and institute
The input of the DC/AC changer 3 stated is connected, the low pressure input of the outfan of this DC/AC changer 3 and described transformator 4
End is connected, and the described high-voltage output end of transformator 4 is connected with AC network 5;
The described outfan of the first controller 6 is connected with the control end of described DC/DC changer 2, the first controller 6
Input be connected with the outfan of DC/DC changer 2, the described outfan of second controller 7 and DC/AC changer 3
Control end is connected, and the input of second controller 7 is connected with the outfan of described DC/AC changer 3.
Fig. 2 is the control block diagram of the first controller 6, and the first described controller 6 includes first comparator and PI control
Device processed, the input of output termination the first PI controller of this first comparator.
Described second controller 7 includes virtual synchronous inversion control, Power Control, current control, voltage coordinate conversion
Module, electric current coordinate transferring and inverse coordinate transferring six part, described virtual synchronous inversion control part includes machine
Tool part, excitation system, angular transition module and electric part;
Described mechanical part outfan connects the described input of angular transition module respectively and described inverse coordinate turns
The input of die change block, the outfan of described angular transition module connects the input of described voltage coordinate modular converter respectively
With the input of electric current coordinate transferring, the described electric part of the output termination of described voltage coordinate modular converter defeated
Enter end, the output of described excitation system terminates the input of described electric part, and the output of described electric part terminates
The input of described current control, the input of the described current control of the output termination of described Power Control, described electricity
The input of the inverse coordinate transferring described in output termination of flow control;
The second comparator that described mechanical part includes being sequentially connected, the 3rd comparator, hypothetical rotor inertial element,
One adder and first integrator, the outfan of described hypothetical rotor inertial element connects described second through tune difference feedback element
Second input of comparator;
Described excitation system includes the 4th comparator, virtual magnetizing exciter and the first compensator, described virtual magnetizing exciter
Outfan connect the second input of the 4th comparator through the first described compensator;
Described power control section is divided including the 5th comparator and the 2nd PI controller, the 6th comparator and the 3rd PI control
Device;
Described current control division divides including the control of d axle component and the control of q axle component, and described d axle component controls inclusion
Second adder, the 7th comparator and the 4th PI controller, described q axle component controls and includes the 3rd adder, the 8th compares
Device and the 5th PI controller.
Fig. 3 is virtual synchronous inversion control entirety control block diagram, and Fig. 4 is mechanical part control block diagram, and Fig. 5 is virtual synchronous
The exciter control system of inversion controlling method, Fig. 6 is the Power Control block diagram of second controller 7, and Fig. 7 is the electricity of second controller
Flow control block diagram, Fig. 8 is angular transition module diagram, and Fig. 9 is the overall control flow chart of present system.Fig. 4, Fig. 5, figure
6 and Fig. 7 are included in Fig. 3.
Claims (1)
1. a kind of energy storage method based on virtual synchronous inversion control is it is characterised in that the method comprises the steps:
Step 1) initialization, in this energy-storage system, following parameter value is set according to system requirements by operator:
The DC bus-bar voltage reference value of DC/AC changer
Electromagnetic power reference value P of energy-storage systemref;
Reactive power reference qref Q of energy-storage systemref;
Set difference coefficient R as between 30-50, inertia constant M as between 1-20, load-damping constant D is as 1% or 2%;
Set hypothetical rotor xqImpedance x with statordIt is between 1-10;
AC voltage reference value Uref, per unit value is set to 1;
Set the gain K of the first compensator of excitation systemfWith time constant TfBetween 0-1, the gain K of excitation systema?
Between 100-500, excitation system time constant TeBetween 0-1, upper limit E of excitation voltage amplitudefmaxBetween 0-15,
The lower limit E of excitation voltage amplitudefmin=-Efmax;
Set the hypothetical rotor transient state impedance x ' of electric partdSpan between 0.1-0.5, the transient state impedance x ' of statorq
Span between 0.3-1, the transient state open circuit time constant T ' of d axledoSpan between 1.5-10, q axle temporary
State open circuit time constant T 'qoSpan between 0.5-2.0;
The control coefrficient of the first PI controller is kp1And ki1, 0<kp1<1000,0<ki1<1000;
The control coefrficient of the 2nd PI controller is kp2And ki2, 0<kp2<1000,0<ki2<1000;
The control coefrficient of the 3rd PI controller is kp3And ki3, 0<kp3<1000,0<ki3<1000;
The control coefrficient of the 4th PI controller is kp4And ki4, 0<kp4<1000,0<ki4<1000;
The control coefrficient of the 5th PI controller is kp5And ki5, 0<kp5<1000,0<ki5<1000;
Using Hall element, DC voltage, AC voltage and current are sampled, obtain DC/DC changer (2)
Output end voltage Udc, unit is per unit value, and grid side three-phase voltage ea, eb, ecWith grid side three-phase current ia, ib, ic;
Step 2), the first controller executes according to the following steps:
21), first comparator calculates the input value of a PI controller:
22), a PI controller is calculated after the output receiving above-mentioned first comparator, exports corresponding controlled quentity controlled variable:
Step 3) mechanical part of virtual synchronous inversion control of second controller (7) executes according to the following steps:
31), following equation is pressed by the second comparator and calculate virtual machine power Pm:
Wherein, PrefIt is the electromagnetic power reference value setting, R is difference coefficient, Δ ω is hypothetical rotor offsetFor the output of hypothetical rotor inertial element, M is the inertia constant in hypothetical rotor inertial element, and D is void
Intend the load-damping constant in rotor inertia link, s is complex frequency, the initial value of Δ ω is set to zero;
32), pass through virtual accelerating power P of the 3rd comparator calculating machine parta:
Pa=Pm-Pe, wherein PeFor the electromagnetic power of mechanical part, Pe=eaia+ebib+ecic;
33), calculating angular velocity by first adder is:ω=ω0+ Δ ω, ω0For the initial value of angular velocity, work as mains frequency
For 50Hz, then ω0=2 × π × 50=314rad/s;
34), synchronous angle is calculated by first integrator:θ=∫ ω;θ is the input of angular transition module;
35), angle compensation is carried out by angular transition module, formula is as follows:
Wherein, θ ' is lock phase angle;I is power network current amplitude;egFor grid voltage amplitude;xqFor hypothetical rotor impedance;
Step 4), the excitation system of second controller virtual synchronous inversion control executes according to the following steps:
41), pass through input quantity U that the 4th comparator calculates virtual magnetizing excitert, formula is as follows:
Ut=Uref-Ux
Wherein:UrefFor the AC magnitude of voltage setting, KfAnd TfGain for the first compensator and time constant;UxFor the first benefit
Repay the output of device;
42) the input virtual excitation voltage E of electric part, is calculated by virtual magnetizing exciterf, formula is as follows:
Wherein:KaAnd TeIt is respectively gain and the time constant of virtual magnetizing exciter, EfmaxAnd EfminIt is respectively the electricity of virtual magnetizing exciter
The upper and lower bound of pressure amplitude value;
43), pass through the first compensator and calculate Ux, formula is as follows:
Step 5), voltage coordinate conversion module and electric current coordinate transformation module execute according to the following steps:
51), by ea、ebAnd ecCalculate line voltage d-q component U through voltage coordinate conversion moduledAnd Uq, formula is as follows:
52), by ia、ibAnd icCalculate line voltage d-q component i through electric current coordinate transformation moduledAnd iq, formula is as follows:
Step 6), the electric part of second controller virtual synchronous inversion control executes according to the following steps:
61), calculating current is with reference to Idref1And Iqref1, formula is as follows:
Wherein:UdAnd UqIt is the d-q component of line voltage;Idref1And Iqref1It is described DC/AC changer (3) output current
Virtual stator current part, EfIt is virtual excitation voltage;
Step 7), second controller Power Control part executes according to the following steps:
71) input of the 2nd PI controller, is calculated by the 5th comparator:Pref-Pe;
72), the 2nd PI controller is controlled computing after the output receiving above-mentioned 5th comparator, and output is corresponding to be controlled
Amount Idref2:Idref2=kp2(Pref-Pe)+ki2∫(Pref-Pe)dt;It is the input of current control part;
73) input of the 3rd PI controller, is calculated by the 6th comparator:Qref-Qe, QeIdle work(for energy-storage system output
Rate;
74), the 3rd PI controller is controlled computing after the output receiving above-mentioned 6th comparator, and output is corresponding to be controlled
Amount Iqref2:
Iqref2=kp3(Qref-Qe)+ki3∫(Qref-Qe)dt;It is the input of current control part;
Step 8), the d axle component of second controller (7) current control part controls and executes according to the following steps:
81), calculate d shaft current reference value Idref, formula is as follows:
Idref=Idref1+Idref2;
82) input of the 4th PI controller, is calculated by the 7th comparator:Idref-Id;IdFor three-phase current d axle component,
By ia、ibAnd icThrough coordinate transform output;
83), the 4th PI controller is controlled computing after the output receiving above-mentioned 7th comparator, exports mutually deserved control
Amount U processeddref:Udref=kp4(Idref-Id)+ki4∫(Idref-Id)dt;
Step 9), the q axle component of second controller current control part controls and executes according to the following steps:
91), calculate q shaft current reference value Iqref, formula is as follows:
Iqref=Iqref1+Iqref2;
92) input of the 5th PI controller, is calculated by the 8th comparator:Iqref-Iq;IqFor three-phase current q axle component, by
ia、ibAnd icThrough coordinate transform output;
93), the 5th PI controller is controlled computing after the output receiving above-mentioned 8th comparator, exports mutually deserved control
Amount Uqref:Uqref=kp5(Iqref-Iq)+ki5∫(Iqref-Iq)dt;
Step 10), second controller output:
101), by the U being obtaineddrefAnd UqrefThrough the conversion of inverse coordinate transformation module, obtain Uaref、UbrefAnd UcrefThree modulation
Ripple, using these three amounts as control signal with carrier wave ratio relatively, obtains the control signal of DC/AC changer (3), and formula is as follows:
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