CN108418231A - A kind of mixing multiport railway power inverter and its power coordination control method - Google Patents
A kind of mixing multiport railway power inverter and its power coordination control method Download PDFInfo
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- CN108418231A CN108418231A CN201810337304.5A CN201810337304A CN108418231A CN 108418231 A CN108418231 A CN 108418231A CN 201810337304 A CN201810337304 A CN 201810337304A CN 108418231 A CN108418231 A CN 108418231A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a kind of mixing multiport railway power inverter and its power coordination control methods, first according to the power and bearing power of new energy offer, railway power regulator are calculated and needs the power compensated, makes three-phase traction Wondertek to active balance；Secondly, the back-to-back PWM rectifier of prime is controlled using modified virtual synchronous machine, realizes negative phase-sequence, idle compensation, stable high voltage side series direct current voltage, while can inhibit voltage ripple of power network, improves Traction networks power supply reliability；Finally, intergrade DC/DC converters use stabilizing low voltage busbar voltage, while controlling the voltage and power-balance at high-pressure series end, and introduce VARIABLE PARAMETER PID CONTROL according to small-signal model, enhance the dynamic property of control system, improve the adaptability of control parameter.
Description
Technical field
The present invention relates to electric railway technical fields, in particular to a kind of mixing multiport railway power conversion
Device and its power coordination control method.
Background technology
In recent years, Chinese Railway achieves rapid progress, China have become in the world high-speed railway operating mileage longest,
Largest country is built, and China " four vertical four is horizontal " all substantially all perforation of High-speed Railway Network, High-speed Railway Network just have
Scale.It is negative phase-sequence problem in electric railway thereupon to become to become increasingly conspicuous.Railway power regulator (RPC) is inhibiting to lead
Draw the voltage fluctuation for becoming power supply system and imbalance of three-phase voltage, compensation harmonic and the excessively low power quality problem of supply conductor voltage
Significant effect, be a kind of effective comprehensive treatment means.With the big rule of the grid-connected power generation systems such as China's solar energy, wind energy
Mould construction and development, and it is mainly distributed on great Northwest area so that at present generation of electricity by new energy power send outside and dissolve it is inadequate
Convenient and quick, the grid-connected and consumption problem of a large amount of distributed new systems seriously highlights.However as China's high-speed iron
The construction and development of road houlage network are extended in all direction throughout each city of national each province and certain remote mountain areas, network, and load has
Work(demand increasingly increases.In order to mitigate the contradiction between grid-connected power generation system and the highly energy-consuming railway system, research is adapted to new
The railway power regulator and its control method of energy access, which seem, to become more and more important.
Railway power regulator (RPC) was proposed by Japanese scholars in 1993 earliest.Currently, holding to improve compensation
Amount, it is proposed that railway power regulator multiplex and the structure based on Modular multilevel converter, but these railway power
Adjuster or converter could not be real although the active transfer of the large capacity of two draft arms, idle and negative sequence compensation can be realized
Now control is coordinated in the access of efficient concentration and its energy management of extensive new energy, insufficient to inhibiting voltage ripple of power network to consider.
Invention content
The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, provide a kind of mixing multiport railway work(
Rate converter and its power coordination control method realize the access on the spot and consumption of new energy, alleviate imbalance between supply and demand, realize simultaneously
The comprehensive compensation of the power quality of the railway system and energy management.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of mixing multiport railway power inverter comprising two multiwinding transformers are accessed with new energy is adapted to
Multiple power unit modules；The primary side of each multiwinding transformer is all connected with two traction power supply arms, and secondary side is separately connected power
Unit module；Each power unit module by the back-to-back H bridge type PWM rectifier of prime, intergrade isolated form DC/DC converters and
Rear class low-voltage direct microgrid forms；Intergrade isolated form DC/DC converters include multiple single-phase isolated form DC/DC converters, institute
It states multiple single-phase isolated form DC/DC converters high pressure lateral capacitances and is serially connected rear and single H bridge type PWM rectifier module back-to-back
DC bus be connected, the multiple single-phase isolated form DC/DC converters low pressure lateral capacitance is parallel with one another, reconnect rear class direct current
Microgrid；The power coordination control method includes：
1) detection two-phase load current iLjWith the output electricity of the back-to-back H bridge type PWM rectifier of each power unit module
Flow icjx, output voltage ucjx, wherein j=a, b, x=1~N, N indicate power unit module number；
2) it is real that each power unit module a, b phase of railway power regulator is calculated in the data for utilizing step 1) detection
The active-power P of border outputjx, reactive power QjxWith the active-power P of loadLj, and according to the input power P of new energyin, into
The calculating and distribution of row power obtain the active power of railway power regulator a, b phase expected compensationAnd reactive power
3) the DC bus-bar voltage u of each back-to-back H bridge type PWM rectifier of power unit module is detecteddcx；
4) by each power unit module DC bus-bar voltage reference valueWith the DC bus-bar voltage u detecteddcxPhase
Subtract, obtain error signal, error signal obtains additional active compensating instruction Δ P using pi regulatorx, then with step 2)
Obtained active power superposition, obtains the final active benefit of back-to-back H bridge type PWM rectifier a, the b phase of each power unit module
Repay instruction Psetjx；
5) it uses virtual synchronous machine to control, obtains back-to-back H bridge type PWM rectifier a, the b phase of each power unit module
Modulated signal ejx, it is re-introduced into traction busbar voltage and obtains final modulation wave signal d as feed-forward signaljx；
6) detection intergrade isolated form DC/DC converter low-voltage direct busbar voltages V1, and subtract each other with setting value, difference warp
PI controls are crossed, a part for current inner loop command signal is obtainedThe height of the single H bridge type PWM rectifier back-to-back of detection connection
Press each cell voltage V of side series capacitance2i, it is averaged Vave, then with cell voltage V2iSubtract each other and carry out P controls, obtains
The corrected value of one current inner loop command signalCorrected valueOutput valve is controlled with voltage close loopIt is added and constitutes always
Current reference signalWherein i=1~M, M indicate the DC/DC converter quantity of each power cell DC side connection；
7) according to specified transimission power PrefCalculate the phase shifting angle reference value φ of systemref, and then according to the small of system
Signal model calculates feed-forward coefficients 1/H；The current reference signal that step 6) is obtained and actual current I1iSubtract each other to obtain error
Signal delta I1i, control to obtain the correction value delta φ of phase shifting angle by the ratio that parameter is 1/Hi, correction value delta φiWith the shifting of system
Phase angle reference value φrefIt is added and obtains the phase shifting angle instruction φ of each power unit modulei.In the step 2, in order to realize three
The active power balance of phase primary side side, can push away two traction power supply arms expectation output power Psa、PsbWith multiport railway work(
Rate adjuster a, b phase expected compensation powerWith
In the step 4, in order to stablize back-to-back PWM rectifications per module DC bus-bar voltage, each power unit module
The final active compensating instruction P of back-to-back H bridge type PWM rectifier a, b phasesetax、PsetbxIn attached it is a part of it is active compensation refer to
Enable Δ Px, expression is as follows：
In the step 5), by the reactive power of the back-to-back H bridge type PWM rectifier expected compensation of each power unit module
QsetjWith reality output reactive power QjxSubtract each other, obtains reactive power error；By the output electricity of each back-to-back H bridge type PWM rectifier
Pressure amplitude value UcjxmWith rated voltage amplitude Ucjxm refSubtract each other, difference is multiplied by with the idle sagging coefficient D of voltage-q, product and idle mistake
Difference is multiplied by 1/KS after being added, and obtains modulation wave amplitude Ejx；By the active compensating instruction of each power unit module expected compensation
PsetjxWith reality output active-power PjxSubtract each other again divided by specified angular frequencyn, obtain machine torque TmjxWith electromagnetic torque Te's
Difference, i.e. torque error；By the angular frequency of virtual synchronous control outputjxWith specified angular frequencynSubtract each other multiplied by with active-frequency
The sagging coefficient D of ratep, it is multiplied by 1/JS after being added with torque error and obtains the angular frequency of virtual synchronous control, angular frequency is multiplied by with 1/S
Obtain modulating wave phase angle θjx, by EjxAnd θjxSynthesize the modulated signal e of virtual synchronous control outputjx, obtained in conjunction with electric voltage feed forward
To final modulating wave djx, expression is as follows：
In the step 7),Wherein, PinNew energy input power；V2 ref、V1 refRespectively
Single-phase isolated form DC/DC converters high-pressure side and low-pressure side rated voltage；fsIndicate fundamental frequency；L1、L2Respectively Multiple coil becomes
Depressor both sides leakage inductance；M indicates the DC/DC converter quantity of each power cell DC side connection；It is isolated for each intergrade
The current reference signal of type DC/DC converter voltages control output；ΔI1iFor each DC/DC converters low-pressure side actual current value
I1iWith command valueError；ΔφiFor current error Δ I1iPhase shifting angle corrected value after P is adjusted.
Compared with prior art, the advantageous effect of present invention is that：
(1) multiport railway power regulator of the present invention is adapted to the access of new energy, according to according to two phase load of draft arm
The general power that power and new energy resources system generate obtains the reference value of multiport railway power regulator a, b phase output power, and
Illustrate that the multiport power conversion network is a passive network, in the ideal case, does not absorb energy and also do not release energy.
(2) it adds a part of active power in virtual synchronous controls active compensating instruction and realizes pwm converter DC side
The stability contorting of voltage, and voltage magnitude to Traction networks and frequency provide certain supporting role；And in virtual synchronous machine control
Superimposed voltage feed-forward signal in the output modulating wave of device processed keeps response more rapid accurate.
(3) by the small-signal model of DC/DC converters, the phase shifting angle deviation of output current deviation and system is obtained
Between relationship, the control block diagram of design system accordingly, and each unit phase shifting angle instruction and small signal transfer function H with
The transimission power of system changes and changes, the dynamic property for the system that can tighten control in this way, improves the adaptability of control parameter.
The present invention devises a kind of mixing multiport railway power inverter, and according to the power calculation of load and new energy
Go out railway power regulator reference value；Meanwhile it using virtual synchronous control is improved, realizing three-phase power balance, inhibiting Traction networks
Voltage fluctuation improves the power supply reliability of Traction networks, stablizes prime PWM rectifier DC bus-bar voltage；Finally, pass through DC/DC
The active power of converter transfer calculates the quick response of the phase shifting angle realization power of alternating voltage, stabilizing low voltage busbar electricity
Pressure, realizes the equilibrium of high-pressure series terminal voltage and power, and establishes the small-signal model of system, and small signal transfer function H is with biography
The variation of defeated power and change, enhance the dynamic property of system；The access on the spot and consumption of new energy may be implemented in the present invention, delays
Imbalance between supply and demand is solved, while realizing comprehensive compensation and the energy management of the power quality of the railway system.
Description of the drawings
Fig. 1 is the multiport railway power regulator system construction drawing of the present invention；Wherein, (a) is trailer system structure chart；
(b) it is the back-to-back H bridge type PWM rectifier structure chart of prime multiple module paralleling；(c) it is intergrade DC/DC transformer configuration figures；
Fig. 2 is the improvement virtual synchronous machine control block diagram of prime PWM rectifier；(a) it is the work(of a, b two phase PWM converter
Rate reference signal detection figure；(b) it is the improvement virtual synchronous machine control block diagram of two phasing commutator of a, b；
Fig. 3 is the control system block diagram of intergrade DC/DC converters；
Specific implementation mode
Multiport railway power regulator shown in FIG. 1 is made of three parts, and prime is the multimode as shown in (b) in Fig. 1
The back-to-back H bridge type PWM rectifier of block parallel connection, two-phase supply arm is connected to through two multiwinding transformers；Intergrade is such as Fig. 1
In (c) shown in, formed using multiple single-phase isolated form DC/DC converters, the series connection of high pressure lateral capacitance, later with it is single back-to-back
The DC bus of H bridge type PWM rectifier module is connected, and low pressure lateral capacitance is in parallel, reconnects rear class direct-current micro-grid, is substantially carried out work(
The matching of the transmission of rate, electrical isolation and voltage class；Rear class is direct-current micro-grid, grid-connected power generation system (photovoltaic) and energy storage system
System can access the busbar.Assuming that PinFor the general power of grid-connected power generation system input, PLaAnd PLbIndicate two-phase traction power supply arm
Load locomotive power, as shown in (a) in Fig. 1.
In order to realize the active power balance and the access for adapting to new energy, multiport railway power regulation of three-phase traction net
The coordination control strategy of device is as follows：
Step 1, detection two-phase load current iLjIt is defeated with the back-to-back H bridge type PWM rectifier of each power unit module
Go out electric current icjx, output voltage ucjx, wherein j=a, b, x=1~N, expression unit module number；
Step 2, the data detected using step 1, calculate each module a, the b phase reality output of railway power regulator
Active-power Pjx, reactive power QjxWith the active-power P of loadLj, in order to realize the active power balance of three-phase primary side side, root
According to the input power P of new energyin, the calculating and distribution of power are carried out with formula (1), obtain the expectation of two traction power supply arms for electric work
Rate Psa、PsbWith multiport railway power regulator a, b phase expected compensation powerWith
In formula, PsaAnd PsbFor positive value, indicate that Traction networks provide active power；PsaAnd PsbFor negative value, indicate that Traction networks absorb
Active power.
Work as Pin<PLa+PLbWhen, then it represents that the general power that new energy resources system generates is less than the general power of locomotive load, needs at this time
The power that a part is absorbed to three-phase traction net, to realize the balance of active power.Similarly, work as Pin>PLa+PLbWhen, then it represents that
The general power that new energy resources system generates is more than the general power of locomotive load, and system may be used also other than powering to locomotive load at this time
To convey the active power of a part to three-phase traction net.
Above-mentioned two situations can obtain：
Pca ref+Pcb ref+Pin=0 (2)
Formula (2) illustrates that the multiport power conversion network is that a passive network does not absorb energy in the ideal case
It does not release energy.
The control block diagram of prime pwm converter as shown in Fig. 2, the locomotive due to trailer system has random and fluctuation,
Simultaneously locomotive into go out to will produce prodigious power rush and fluctuation, the voltage magnitude of Traction networks and the wave of frequency can be caused
It is dynamic, seriously affect the safe and stable operation of traction power supply net.In order to improve the power supply quality of Traction networks, one kind is employed herein and changes
Into virtual synchronous machine control method, certain supporting role is given to supply conductor voltage amplitude and frequency, improves traction power supply net
Security reliability.According to the detection of the power reference signal of above-mentioned analysis a, b two phase PWM converter as shown in (a) in Fig. 2.
The DC bus-bar voltage u of step 3, each back-to-back H bridge type PWM rectifier of module of detectiondcx；
Step 4, in order to realize the stability contorting of pwm converter DC voltage, by the reference per module DC bus-bar voltage
ValueWith the DC bus-bar voltage u detecteddcxSubtract each other, obtain error signal, using pi regulator GPI(s) it obtains additional
Active compensating instruction Δ Px, then it is superimposed with the active command that step 2 obtains, it is final obtains each module PWM rectifier a, b phase
Active compensating instruction Psetjx, expression is as follows：
Step 5, each electricity reference value and actual value obtained according to above step are controlled, such as Fig. 2 using virtual synchronous machine
In (b), i.e., by the idle Q of the back-to-back H bridge type PWM rectifier expected compensation of each power unit modulesetjWith reality output
Idle QjxSubtract each other, obtains reactive power error；By the output voltage amplitude U of each back-to-back rectifiercjxmWith rated voltage amplitude
Ucjxm refSubtract each other multiplied by with the idle sagging coefficient D of voltage-q, it is multiplied by 1/KS after being added with reactive power error, obtains modulation wave amplitude
Ejx；By the active P of each power unit module expected compensationsetjxWith the active P of reality outputjxSubtract each other again divided by specified angular frequency
ωnObtain machine torque TmjxWith electromagnetic torque TeDifference；By the angular frequency of virtual synchronous control outputjxWith specified angular frequency
Rate ωnSubtract each other multiplied by with active-frequency droop coefficient Dp, it is multiplied by 1/JS after being added with torque error and obtains virtual synchronous control
Angular frequency obtains modulating wave phase angle θ multiplied by with 1/Sjx, E and θ are synthesized to the modulated signal e of virtual synchronous control outputjx, then
Final modulating wave d is obtained in conjunction with electric voltage feed forwardj, formula is as follows：
From the structure of (c) in Fig. 1, it can be seen that intermediate isolating type DC/DC converters are responsible for connection prime and rear class
System manages the flowing and distribution of power, is the core component of the railway power regulating system.Here by primary study, its is equivalent
Model and port power control method.The active power of transmission such as following formula：
Wherein：A=2 π2fs(L1+L2)。I1、I2It is the Equivalent DC side current value of two-port respectively；V1、V2It is both ends respectively
The Equivalent DC side voltage value of mouth；L1、L2It is the leakage inductance of high frequency transformer both sides；P12It is the wattful power shifted between two-port
Rate.According to above-mentioned equation, it is assumed that in the case that transimission power has been determined, solve unknown number φ, then have unique solution.Due to the phase shift of φ
Range is between (- pi/2, pi/2), according to the resolution principle of quadratic equation with one unknown, then can find out：
According to above formula, can obtain：P12＜ V1V2/8fs(L1+L2), as, the maximum power transmitted between two-port is answered
Less than V1V2/8fs(L1+L2).In this way in the case where nominal transmission power has been determined, it is possible thereby to calculate exit port output alternating current
The phase shifting angle φ of pressure, it is possible thereby to realize the quick response of power.
In order to establish the small-signal model of system, it is assumed that system is stablized in operating point D, Δ I1Electric current when indicating stable state is inclined
Residual quantity；Δ φ indicates the departure of phase shifting angle.Mathematic(al) representation is transmitted according to the steady state power of two-port converter, it respectively can be with
Derive the mathematic(al) representation of stable component and error component.If ignoring the quadratic component of departure, have：
It is hereby achieved that：
It is hereby achieved that the small signal transfer function H of system can build the control block diagram of system such as on this basis
Shown in Fig. 3.Control system uses voltage and current double -loop control, outer voltage to be controlled using PI, and control and stabilizing low voltage direct current are female
Line voltage, high-pressure side series direct current voltage are controlled by prime MMC cascade connection types PWM rectifier and are stablized；Current inner loop is controlled using P
System, the control parameter of current inner loop are set as 1/H.Simultaneously in order to realize dividing equally for high-pressure series side voltage and power, adopt here
With Pressure and Control,
Step 6, detection intergrade isolated form DC/DC converter low-voltage direct busbar voltages V1, and subtract each other with setting value, it passes through
PI controls are crossed, a part for current inner loop command signal is obtainedThe single H bridge type PWM rectifier module back-to-back of detection connection
The each cell voltage V of high-pressure side series capacitance2i, it is averaged Vave, then with cell voltage V2iSubtract each other and carry out P controls,
Obtain the corrected value of a current inner loop command signalOutput valve is controlled with voltage close loopIt is added and constitutes total electric current
Reference signalWherein i=1~M indicates DC/DC converter quantity；
Step 7, foundation formula (11), according to specified transimission power Pin, high-pressure side and low-pressure side rated voltage V2 ref、
V1 ref, high frequency transformer both sides leakage inductance L1、L2, cascade module number M obtain the phase shifting angle reference value φ of systemref, further according to being
The small-signal model of system calculates feed-forward coefficients 1/H；The current reference signal that step 6 is obtainedWith each DC/DC converters
Low-pressure side actual current value I1iSubtract each other to obtain error signal Δ I1i, control to obtain the school of phase shifting angle by the ratio that parameter is 1/H
Positive value delta φi, the phase shifting angle reference value φ with systemrefIt is added and obtains the phase shifting angle instruction φ of each uniti, it is shown below：
Thus according to this signal psirefWith the output signal Δ φ of closed-loop current controli, the shifting of each unit can be obtained
Phase angle signal φi.Due to φrefAll it is to be determined according to the transimission power of system different operation phase with H, so control parameter
It is to change with the transimission power variation of system, the dynamic property for the system that can tighten control in this way improves control parameter
Adaptability.
Claims (6)
1. a kind of mixing multiport railway power inverter, which is characterized in that including two multiwinding transformers and be adapted to new
Multiple power unit modules of energy access；The primary side of each multiwinding transformer is all connected with two traction power supply arms, secondary side difference
Connect power unit module；Each power unit module is by the back-to-back H bridge type PWM rectifier of prime, intergrade isolated form DC/DC
Converter and rear class low-voltage direct microgrid composition；Intergrade isolated form DC/DC converters include that multiple single-phase isolated form DC/DC become
Parallel operation, the multiple single-phase isolated form DC/DC converters high pressure lateral capacitance are whole with single H bridge type PWM back-to-back after being serially connected
The DC bus for flowing device module is connected, and the multiple single-phase isolated form DC/DC converters low pressure lateral capacitance is parallel with one another, reconnects
Rear class direct-current micro-grid.
2. a kind of power coordination control method of mixing multiport railway power inverter described in claim 1, feature exist
In including the following steps：
1) detection two-phase load current iLjWith the output current of the back-to-back H bridge type PWM rectifier of each power unit module
icjx, output voltage ucjx, wherein j=a, b, x=1~N, N indicate power unit module number；
2) it is practical defeated that each power unit module a, b phase of railway power regulator is calculated in the data for utilizing step 1) detection
The active-power P gone outjx, reactive power QjxWith the active-power P of loadLj, and according to the input power P of new energyin, carry out work(
The calculating and distribution of rate obtain the active power of railway power regulator a, b phase expected compensationAnd reactive power
3) the DC bus-bar voltage u of each back-to-back H bridge type PWM rectifier of power unit module is detecteddcx；
4) by each power unit module DC bus-bar voltage reference valueWith the DC bus-bar voltage u detecteddcxSubtract each other, obtains
To error signal, error signal obtains additional active compensating instruction Δ P using pi regulatorx, then obtained with step 2)
Active power superposition, obtain the final active compensation of back-to-back H bridge type PWM rectifier a, the b phase of each power unit module and refer to
Enable Psetjx；
5) it uses virtual synchronous machine to control, obtains the modulation of back-to-back H bridge type PWM rectifier a, the b phase of each power unit module
Signal ejx, it is re-introduced into traction busbar voltage and obtains final modulation wave signal d as feed-forward signaljx；
6) detection intergrade isolated form DC/DC converter low-voltage direct busbar voltages V1, and subtract each other with setting value, difference passes through PI
Control, obtains a part for current inner loop command signalThe high-pressure side of the single H bridge type PWM rectifier back-to-back of detection connection
The each cell voltage V of series capacitance2i, it is averaged Vave, then with cell voltage V2iSubtract each other and carry out P controls, obtains one
The corrected value of current inner loop command signalCorrected valueOutput valve is controlled with voltage close loopIt is added and constitutes total electricity
Flow reference signalWherein i=1~M, M indicate the DC/DC converter quantity of each power cell DC side connection；
7) according to specified transimission power PrefCalculate the phase shifting angle reference value φ of systemref, and then according to the small signal of system
Model calculates feed-forward coefficients 1/H；The current reference signal that step 6) is obtained and actual current I1iSubtract each other to obtain error signal
ΔI1i, control to obtain the correction value delta φ of phase shifting angle by the ratio that parameter is 1/Hi, correction value delta φiWith the phase shifting angle of system
Reference value φrefIt is added and obtains the phase shifting angle instruction φ of each power unit modulei。
3. according to the method described in claim 2, it is characterized in that, in step 2), active powerAnd reactive power's
Calculation formula is as follows：
4. according to the method described in claim 2, it is characterized in that, in step 4), back-to-back H bridge type PWM rectifier a, b phase is most
Whole active compensating instruction PsetjxCalculation formula be：
Wherein, GPI(s) it is the transmission function of PI controllers.
5. according to the method described in claim 2, it is characterized in that, the specific implementation process of step 5) includes：By each power
The reactive power Q of the back-to-back H bridge type PWM rectifier expected compensation of unit modulesetjWith reality output reactive power QjxSubtract each other, obtains
To reactive power error；By the output voltage amplitude U of each back-to-back H bridge type PWM rectifiercjxmWith rated voltage amplitude Ucjxm refPhase
Subtract, difference is multiplied by with the idle sagging coefficient D of voltage-q, product is added with reactive power error is multiplied by 1/KS later, obtains modulation wave amplitude
Value Ejx；By the active compensating instruction P of each power unit module expected compensationsetjxWith reality output active-power PjxSubtract each other again
Divided by specified angular frequencyn, obtain machine torque TmjxWith electromagnetic torque TeDifference, i.e. torque error；Virtual synchronous is controlled
The angular frequency of outputjxWith specified angular frequencynSubtract each other multiplied by with active-frequency droop coefficient Dp, after being added with torque error
It is multiplied by 1/JS and obtains the angular frequency of virtual synchronous control, angular frequency obtains modulating wave phase angle θ multiplied by with 1/Sjx, by EjxAnd θjxIt closes
As the modulated signal e of virtual synchronous control outputjx, final modulating wave d is obtained in conjunction with electric voltage feed forwardjx, expression
It is as follows：
6. according to the method described in claim 2, it is characterized in that, in step 7),Wherein, PinNewly
Energy input power；V2 ref、V1 refRespectively single-phase isolated form DC/DC converters high-pressure side and low-pressure side rated voltage；fsIt indicates
Fundamental frequency；L1、L2Respectively multiwinding transformer both sides leakage inductance；M indicates that the DC/DC of each power cell DC side connection becomes
Parallel operation quantity；For the current reference signal of each intergrade isolated form DC/DC converter voltages control output；ΔI1iIt is every
A DC/DC converters low-pressure side actual current value I1iWith command valueError；ΔφiFor current error Δ I1iIt is adjusted by P
Phase shifting angle corrected value afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810337304.5A CN108418231B (en) | 2018-04-16 | 2018-04-16 | Hybrid multi-port railway power converter and power coordination control method thereof |
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| CN201810337304.5A CN108418231B (en) | 2018-04-16 | 2018-04-16 | Hybrid multi-port railway power converter and power coordination control method thereof |
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| CN108418231A true CN108418231A (en) | 2018-08-17 |
| CN108418231B CN108418231B (en) | 2021-05-25 |
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