CN107947544A - A kind of unit cascaded type high-power high-frequency ice-melt power control method - Google Patents
A kind of unit cascaded type high-power high-frequency ice-melt power control method Download PDFInfo
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- CN107947544A CN107947544A CN201710617946.6A CN201710617946A CN107947544A CN 107947544 A CN107947544 A CN 107947544A CN 201710617946 A CN201710617946 A CN 201710617946A CN 107947544 A CN107947544 A CN 107947544A
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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Abstract
The invention discloses a kind of unit cascaded type high-power high-frequency ice-melt power control method, it includes：Step 1, input side utilize instantaneous Direct Current Control, realize input side power factor rectification, and Direct Current Control is made of the double-closed-loop control of current inner loop and outer voltage, suppress input side harmonic wave；Step 2, combination inverter SPWM inversion controls, phase shift H bridge inverter structure controls are combined using multiplex；Step 3, combination inverter are using input pressure output sharing control；Solve the prior art ice-melt excitation input power harmonic wave it is big, input current quality is not high；Outlet side output harmonic wave is big, and produces circulation, reduces the technical problems such as the security of ice-melt power supply.
Description
Technical field
The invention belongs to transmission line de-icing technology；A kind of more particularly to unit cascaded type high-power high-frequency ice-melt power supply control
Method processed.
Background technology
Freeze in the winter time under sleety weather, line ice coating easily causes conductor galloping, tripping power failure, bar (tower), conducting wire
The catastrophe failure such as fracture.Currently used de-icing method has ac short circuit ice-melting method and DC ice melting method etc..However, ac short circuit
Ice-melt and DC ice melting are needed to power grid grid switching operation, and DC ice-melting, which needs to stop transport, carries out ice-melt, for super-pressure and extra-high voltage
Transmission line of electricity will cause huge ability to transmit electricity to lose due to stopping transport, and since grid structure Iterim Change causes power grid risk to increase
Add.Therefore, capture online de-icing method and technology is most important has extremely important application prospect.
High-frequency and high-voltage excitation de-icing method is the important technology for realizing the online ice-melt of transmission line of electricity；It passes through in ice coating wire
Upper application high-frequency and high-voltage excitation ice melting current, comprehensive uniformly hair is produced using high frequency kelvin effect and the dielectric loss principle of ice
Fuel factor realizes ice-melt, and forms system with high frequency electric microwave trap, circuit high-frenquency current blocking device, ice melting current is only limitted to line
Ice-melt section in road is flowed so as to fulfill online ice-melt；Conventional control mode is there are ice-melt excitation input power harmonic wave is big, input electricity
Family status matter is not high；Outlet side output harmonic wave is big, and produces circulation, reduces the technical problems such as the security of ice-melt power supply.
The content of the invention：
The technical problem to be solved in the present invention：A kind of unit cascaded type high-power high-frequency ice-melt power control method is provided,
Big to solve prior art ice-melt excitation input power harmonic wave, input current quality is not high；Outlet side output harmonic wave is big, and produces
Circulation, reduces the technical problems such as the security of ice-melt power supply.
Technical solution of the present invention：
A kind of unit cascaded type high-power high-frequency ice-melt power control method, it includes：
Step 1, input side utilize instantaneous Direct Current Control, realize input side power factor rectification, Direct Current Control
It is made of the double-closed-loop control of current inner loop and outer voltage, suppresses input side harmonic wave；
Step 2, combination inverter SPWM inversion controls, phase shift H bridge inverter structure controls are combined using multiplex；
Step 3, combination inverter are using input pressure output sharing control.
Current inner loop described in step 1 and outer voltage, outer voltage use PIAdjuster, makes DC output voltage udTracking
Given voltage value ud *, keep output DC-side Voltage Stabilization；Current inner loop uses current control, is detected by phase-locked loop pll defeated
Enter the frequency and phase of voltage on line side, and as given value of current value is *Assigned frequency and phase, while as current inner loop
Input signal, makes input current on line side isThe given current value i of trackings *, then realize that input side power factor is adjustable；Calculation formula
For：
In formula：uiCorrection term for current inner loop to modulation voltage,K is rate mu-factor；Ti,
KpFor pi regulator parameter；usAnd isRespectively input voltage on line side, electric current；unmIt is respectively to input voltage on line side peak value electricity with ω
Pressure and voltage angular frequency；idAnd udRespectively export DC current, voltage.
Inverter SPWM inversion controls are combined described in step 2, using multiplex combination phase shift H bridge inverter structure controls
Control method is：In n changes inversion combination unit again, sinusoidal modulation wave and carrier triangular are produced by Digital Signal Processing DSP devices
Ripple, wherein each inverter unit uses identical modulating wave, and the phase of carrier triangular wave is mutually staggered 2 π/n angle, profit
Phase-shift type PWM waveform, the control waveform of generation are generated with the waveform superposition in the waveform generation and multiple technology in PWM technologies
The controlled thyristor of each inverter unit is controlled respectively.
Inverter input pressure output sharing control is combined described in step 3 to be included：Input grading ring, output-voltage loop and electricity
Flow inner ring control；Specially：
System output voltage voThrough KvThe output voltage sampled value v of each inverter is obtained after decaying againofn, KvFor output electricity
Pressure ring downsampling factor；Output voltage reference signal vrefThe output voltage sampled value v obtained with each inversion unitofnAfter subtracting each other,
Ring pi regulator G is pressed off through outputvoObtained all information content are averaged, and obtain common reference electric current iave, and as flat
The set-point of equal current bus bar；
The DC voltage input signal v of each modulecdnWith inputting equalizing busbar reference signal vin_refSubtract each other, pressed through input
Ring pi regulator GvdObtain the DC error signal v of each inverter moduleerrn, KfFor input voltage attenuation coefficient；DC error
Signal verrnWith common reference electric current iaveThe current reference value i of each inverter module is obtained through current reference adjustment unitrefn；
The inductive current i of each inverterLfnThrough current inner loop downsampling factor KLfAfter decay with the current reference of corresponding module
Signal irefnSubtract each other, the inductive current i of corresponding inverter output is obtained by tri-state hysteresis current adjusterLfn；Output voltage vo
It is multiplied by sCfObtain capacitance current value iCf, sCfFor output voltage and output filter capacitor electric current iCfTransmission function relation；Will be defeated
Go out filter capacitor electric current iCfWith inductive current iLfSubtract each other to obtain the corresponding output current of respective inversion unit, will accordingly export electricity
Flow valuve is added to obtain output current summation, and converted impedance obtains system output voltage vo；
DC error signal verrjWith average current Setting signal iaveObtained and average current signal i by multiplierave
The sinusoidal error signal i of same-phaseregjAfterwards, with average current Setting signal iaveSubtract each other to obtain the corresponding electricity of each inverter module
Flow reference signal irefj；Being converted into mathematic(al) representation is：
irefj=iave-iregj=iave-verrjiave。
Beneficial effects of the present invention：
The input side of unit cascaded type high-power high-frequency ice-melt power supply is utilized instantaneous Direct Current Control by the present invention, is realized
Enter side unit power factor rectifier, wherein, Direct Current Control is made of the double-closed-loop control of current inner loop and outer voltage, is had
Effect suppresses input side harmonic wave, improves the quality of ice-melt driving source input current；Inversion unit is equal using SPWM multiplexes, input
Pressure, output sharing control, each intermodule makes it have each independent control loop using busbar communication mode, in separate unit unsteady flow
In the case that the switching frequency of device is not very high, H bridge inverters are in parallel, increase exponentially whole current transformer equivalent switching frequency,
And while ice-melt driving source output high frequency, the capacity of device is improved, effectively reduce current transformer output harmonic wave, unit output
Stream eliminates the circulation problem that parallel-connection structure is brought, and improves the security of high frequency ice-melt power supply；Solves prior art ice-melt
Excitation input power harmonic wave is big, and input current quality is not high；Outlet side output harmonic wave is big, and produces circulation, reduces ice-melt electricity
The technical problems such as the security in source.
Brief description of the drawings：
Fig. 1 is the instantaneous Direct Current Control schematic diagram of rectification side；
Fig. 2 is combination phase shift H bridge inverter control principle drawings；
Fig. 3 is the framework and input pressure output sharing control schematic diagram of inverter；
Fig. 4 realizes circuit control principle figure for current reference adjustment unit；
Fig. 5 is unit cascaded type high frequency ice-melt power supply architecture schematic diagram；
Fig. 6 is input side voltage, current waveform schematic diagram；
Fig. 7 is high frequency ice-melt electric power output voltage waveform；
Fig. 8 is the fft analysis schematic diagram of high frequency ice-melt electric power output voltage；
Fig. 9 is two inverter module input voltages, output current compares waveform diagram.
Embodiment：
Present invention control method realizes power cell Parallel opertation high frequency high current, is provided for power grid winter icing circuit
A kind of new ice-melting mode.
The rectification and inversion of high frequency ice-melt power supply of the present invention use full-controlled device, and the control of power cell is including whole
Stream bridge and inversion H bridges control two parts.
(1) input side utilizes instantaneous Direct Current Control, realizes into side unit power factor rectifier, wherein, Direct Current
Control is made of the double-closed-loop control of current inner loop and outer voltage, is effectively suppressed input side harmonic wave, is improved ice-melt driving source
The quality of input current；
(2) inversion unit is pressed using SPWM multiplexes, input, exports sharing control, and each intermodule is communicated using busbar
Mode makes it have each independent control loop, in the case where the switching frequency of separate unit current transformer is not very high, H bridge inversions
Device is in parallel, whole current transformer equivalent switching frequency is increased exponentially and while ice-melt driving source output high frequency, improves device
Capacity, effectively reduce current transformer output harmonic wave, unit output stream eliminates the circulation problem that brings of parallel-connection structure, improves
The security of high frequency ice-melt power supply.
Explanation is further refined to technical solution of the present invention below in conjunction with the accompanying drawings：
The first step：Rectification side input control
Rectification side utilizes instantaneous Direct Current Control, realizes that input power factor is adjustable, and effectively reduces input side harmonic wave
Content.Its control flow chart is as shown in Figure 1.Control loop is made of current inner loop and outer voltage.Outer voltage uses PI tune
Device is saved, makes DC output voltage udTrack given voltage value ud *, keep output DC-side Voltage Stabilization.Current inner loop uses electric current
Control, the frequency and phase of input voltage on line side are detected by phaselocked loop (PLL), and as given value of current value is *Assigned frequency
And phase, while as the input signal of current inner loop, make input current on line side isThe given current value i of trackings *, then realize defeated
It is adjustable to enter side power factor.
Obtained by Fig. 1：
In formula：uiCorrection term for current inner loop to modulation voltage,K is rate mu-factor；Ti,
KpFor pi regulator parameter；usAnd isRespectively input voltage on line side, electric current；unmIt is respectively to input voltage on line side peak value electricity with ω
Pressure and voltage angular frequency；idAnd udRespectively export DC current, voltage.
To improve the dynamic response of pi regulator, using idTo calculate the active constituent i to constant currents2 *, its result of calculation
With is1 *Addition obtains the set-point i of alternating currents *, so as to obtain modulated signal uab。
For deicing device when multiple rectifying is transported, phase difference is 2 π f/f to the sampled point of unit successivelysN, wherein f are
Frequency of modulated wave, fsFor sample frequency.Namely the pulsation of electric current is mutually staggered the 1/k of carrier cycle, each power cell it is humorous
Wave component, which is cancelled out each other, effectively improves the quality of ice-melt driving source input current.Ice-melt is inputted after k (k >=1) reformate stream
The main electrical current higher hamonic wave of device is 2kN ± 1 and 2kN ± 3 time (number of switching frequency when N is modulation), is equivalent to one
The switching frequency of a current transformer rectifier bridge improves k times, reduces system input harmonics content.Can using instantaneous Direct Current Control
Realize input side unit power factor rectifier, and can effectively suppress input side harmonic wave.
Second step：Combine inverter SPWM inversion controls
Inverter SPWM inversion controls strategy using multiplex as shown in Fig. 2, combine phase shift H bridge inverter structures, realization
Inverter output current is big, frequency is high, current-responsive is fast, effectively suppresses harmonic wave.Since single H bridge inverters output current cannot
Meet high current needed for ice-melt, the switching frequency of switching device is not high, and the PWM modulation mode of low switching frequency can produce greatly
Harmonic wave is measured, these factors constrain application of the single H bridge inverters in high frequency ice-melt power supply.Controlled for this using SPWM multiplexes
Technology is to reach the technical indicator needed for high frequency ice-melt power supply.In n changes inversion combination unit again, by Digital Signal Processing DSP
Device produces sinusoidal modulation wave and carrier triangular wave, wherein each inverter unit uses identical modulating wave, and by carrier triangular
The phase of ripple mutually staggers 2 π/n angle, utilizes the waveform superposition generation in waveform generation and the multiple technology in PWM technologies
Phase-shift type PWM waveform, the control waveform of generation control the controlled thyristor of each inverter unit respectively.In separate unit current transformer
In the case that switching frequency is not very high, H bridge inverters are in parallel, and use above-mentioned control mode, whole current transformer equivalent switch
Frequency increases exponentially, and while ice-melt driving source is exported high frequency, improves the capacity of device, effectively reduce unsteady flow
Device output harmonic wave.
3rd step：Combine inverter input pressure output sharing control
To solve the circulation problem of combination each intermodule of inverter parallel structure, it is same that output current is combined using input pressure
The complex controll of phase, while each intermodule uses the individual control loop of busbar communication mode, realizes and eliminates circulation, improves system
The safety and reliability of system.
It is as shown in Figure 3 to combine inverter input pressure output sharing control principle.Its control system include three it is independent
Control loop：Input grading ring, output-voltage loop and current inner loop.Specific control flow is as follows：
System output voltage voThrough KvThe output voltage sampled value v of each inverter is obtained after decaying againofn, KvFor output electricity
Pressure ring downsampling factor.Output voltage reference signal vrefThe output voltage sampled value v obtained with each inversion unitofnAfter subtracting each other,
Ring pi regulator G is pressed off through outputvoObtained all information content are averaged, and obtain common reference electric current iave, and as flat
The set-point of equal current bus bar.
The DC voltage input signal v of each modulecdnWith inputting equalizing busbar reference signal vin_refSubtract each other, pressed through input
Ring pi regulator GvdObtain the DC error signal v of each inverter moduleerrn, KfFor input voltage attenuation coefficient.DC error
Signal verrnWith common reference electric current iaveThe current reference value i of each inverter module is obtained through current reference adjustment unitrefn。
The inductive current i of each inverterLfnThrough current inner loop downsampling factor KLfAfter decay with the current reference of corresponding module
Signal irefnSubtract each other, the inductive current i of corresponding inverter output is obtained by tri-state hysteresis current adjusterLfn；Output voltage vo
It is multiplied by sCfObtain capacitance current value iCf, sCfFor output voltage and output filter capacitor electric current iCfTransmission function relation；Will be defeated
Go out filter capacitor electric current iCfWith inductive current iLfSubtract each other to obtain the corresponding output current of respective inversion unit, will accordingly export electricity
Flow valuve is added to obtain output current summation, and converted impedance obtains system output voltage vo
Wherein current reference adjustment unit is as shown in figure 4, DC error signal verrjIt is (public with average current Setting signal
Reference current) iaveObtained and average current signal i by multiplieraveThe sinusoidal error signal i of same-phaseregjAfterwards, with being averaged
Given value of current signal iaveSubtract each other to obtain the corresponding current reference signal i of each inverter modulerefj.It is converted into mathematic(al) representation such as
Shown in formula 3：
irefj=iave-iregj=iave-verrjiave(3)
Sinusoidal error signal i can be analyzed by mathematic(al) representationrefjAmplitude by DC error signal verrjAdjust, its
Phase is by average current signal iaveControl.
Wherein, above-mentioned input equalizing busbar reference signal vin_ref, output voltage reference signal vref, average current give letter
Number (common reference electric current) iaveGiven respectively by inputting equalizing busbar, output voltage reference synchronization busbar, average current busbar
To respective inversion unit；KfGrading ring voltage sample coefficient, G are inputted for devicevdRegulation ring adjuster, K are pressed to inputvTo be defeated
Go out voltage sample coefficient, GvoRegulation ring adjuster, K are pressed to exportLfFor current inner loop inductive current downsampling factor, vcd1~
vcdnFor the DC input voitage of each inverter, vof1~vofnFor each inverter output voltage sampled value, ig1~ignTotal peace
Average is average current Setting signal iave, verr1~verrnFor each inverter DC error signal, iref1~irefnFor inverter
Current reference signal, iLf1~iLfnFor the inductive current of each inverter output, iCfFor capacitance current, Z is transimpedence.
The technique effect of the present invention：
In order to verify the effective and feasibility effect of the high frequency ice-melt power supply control mode of the present invention.In Matlab/
Simulation study has been carried out in simulink.With unit cascaded the type electric power main circuit module topology structure and the present invention shown in Fig. 5
Control mode built system simulation model.System input ac voltage 0.6kV, rectifier net side inlet wire filter inductance Ls=
2mH, Support Capacitor C=0.6mF；Balance resistance R=1.3k Ω；Filter inductance Lf1=Lf2=...=Lfn=5mH, filter capacitor
Cf1=Cf2=...=Cfn=0.1mF.High frequency boosting becomes device and linear transformer model, its no-load voltage ratio 1 is used in emulation platform:40,
Leakage inductance Lr=55 μ H, distribution capacity Cp=0.5 μ F；Current transformer group number n=4 in parallel；Transmission line simulation loads maximum voltage
14kV, frequency 40kHz.
As shown in fig. 6, in system stable operation, net side inputs the voltage current waveform of each power cell exchange input side
Electric current measures electric current THD=0.98%, the voltage and current position substantially in phase of input side, realizes unit power into sineization
Factor rectification, the effect of prime controlled rectification.
System output voltage waveform makees output voltage fft analysis such as shown in fig. 7, system output voltage value is 14kV
Shown in Fig. 8, show that output voltage frequency is low in 40kHz or so, the total accounting of each harmonic content.
Fig. 9 is two inverter DC input voitages, ac output current and its output fundamental wave circulation in unsteady flow link
iH(define circulation iH=(iLf1-iLf2)/2) oscillogram.From Fig. 9 oscillograms as can be seen that under above-mentioned control program, two
The DC voltage of module input is equal, and output current is also identical, and inversion parallel connection output element realizes input pressure output and flows,
And circulation iHIt is approximately zero, shows the validity of inversion link input pressure output sharing control scheme.Demonstrate of the invention single
The effective and feasibility of first cascade connection type high-power high-frequency ice-melt power supply control strategy.
Innovation of the present invention
(1) control method of the present invention, rectification side utilize instantaneous Direct Current and the control using multiplex PWM controlled rectifications
Mode, realizes that input power factor is adjustable, and effectively suppresses input side harmonic wave.
(2) using multiplex combination phase shift H bridge inverter structures, realize that inverter output current is big, frequency is high, electric current is rung
Should soon, effectively suppress harmonic wave.
(3) current transformer rear class inverter application input, which is pressed, exports sharing control strategy, by pressing, flowing between each unit
The control mode that busbar is in communication with each other, solves the circulation problem of power cell parallel-connection structure generation, improve the safety of system with
Reliability.
(4) high frequency ice-melt power supply output frequency can reach 40kHz, output voltage stabilization, harmonic content under the control mode
It is few, it is easy to improve installed capacity, it is easy to control.
Claims (4)
1. a kind of unit cascaded type high-power high-frequency ice-melt power control method, it includes：
Step 1, input side utilize instantaneous Direct Current Control, realize input side power factor rectification, Direct Current Control is by electricity
The double-closed-loop control for flowing inner ring and outer voltage is formed, and suppresses input side harmonic wave；
Step 2, combination inverter SPWM inversion controls, phase shift H bridge inverter structure controls are combined using multiplex；
Step 3, combination inverter are using input pressure output sharing control.
A kind of 2. unit cascaded type high-power high-frequency ice-melt power control method according to claim 1, it is characterised in that：
Current inner loop described in step 1 and outer voltage, outer voltage use PIAdjuster, makes DC output voltage udTracking is specified
Magnitude of voltage ud *, keep output DC-side Voltage Stabilization；Current inner loop uses current control, and input net is detected by phase-locked loop pll
The frequency and phase of side voltage, and as given value of current value is *Assigned frequency and phase, while as the input of current inner loop
Signal, makes input current on line side isThe given current value i of trackings *, then realize that input side power factor is adjustable；Calculation formula is：
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In formula：uiCorrection term for current inner loop to modulation voltage,K is rate mu-factor；Ti, KpFor
Pi regulator parameter；usAnd isRespectively input voltage on line side, electric current；unmWith ω be respectively input voltage on line side crest voltage and
Voltage angular frequency；idAnd udRespectively export DC current, voltage.
A kind of 3. unit cascaded type high-power high-frequency ice-melt power control method according to claim 1, it is characterised in that：
Inverter SPWM inversion controls are combined described in step 2, using the control method of multiplex combination phase shift H bridge inverter structure controls
For：In n changes inversion combination unit again, sinusoidal modulation wave and carrier triangular wave are produced by Digital Signal Processing DSP devices, wherein often
A inverter unit uses identical modulating wave, and the phase of carrier triangular wave is mutually staggered 2 π/n angle, utilizes PWM technologies
In waveform generation and multiple technology in waveform superposition generation phase-shift type PWM waveform, the control waveform of generation controls respectively
The controlled thyristor of each inverter unit.
A kind of 4. unit cascaded type high-power high-frequency ice-melt power control method according to claim 1, it is characterised in that：
Inverter input pressure output sharing control is combined described in step 3 to be included：Input in grading ring, output-voltage loop and electric current
Ring controls；Specially：
System output voltage voThrough KvThe output voltage sampled value v of each inverter is obtained after decaying againofn, KvFor output-voltage loop
Downsampling factor；Output voltage reference signal vrefThe output voltage sampled value v obtained with each inversion unitofnAfter subtracting each other, through defeated
Go out to press off ring pi regulator GvoObtained all information content are averaged, and obtain common reference electric current iave, and as average electricity
Flow the set-point of busbar；
The DC voltage input signal v of each modulecdnWith inputting equalizing busbar reference signal vin_refSubtract each other, through inputting grading ring PI
Adjuster GvdObtain the DC error signal v of each inverter moduleerrn, KfFor input voltage attenuation coefficient；DC error signal
verrnWith common reference electric current iaveThe current reference value i of each inverter module is obtained through current reference adjustment unitrefn；
The inductive current i of each inverterLfnThrough current inner loop downsampling factor KLfAfter decay with the current reference signal of corresponding module
irefnSubtract each other, the inductive current i of corresponding inverter output is obtained by tri-state hysteresis current adjusterLfn；Output voltage voIt is multiplied by
sCfObtain capacitance current value iCf, sCfFor output voltage and output filter capacitor electric current iCfTransmission function relation；Output is filtered
Ripple capacitance current iCfWith inductive current iLfSubtract each other to obtain the corresponding output current of respective inversion unit, by corresponding output current value
Addition obtains output current summation, and converted impedance obtains system output voltage vo；
DC error signal verrjWith average current Setting signal iaveObtained and average current signal i by multiplieraveSame-phase
Sinusoidal error signal iregjAfterwards, with average current Setting signal iaveSubtract each other to obtain the corresponding current reference of each inverter module
Signal irefj；Being converted into mathematic(al) representation is：
irefj=iave-iregj=iave-verrjiave。
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| CN109039096A (en) * | 2018-08-29 | 2018-12-18 | 浙江双驰电气科技有限公司 | A kind of concrete pump power supply using electrolytic capacitor energy storage |
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| CN117175523A (en) * | 2023-11-03 | 2023-12-05 | 中国电力工程顾问集团西南电力设计院有限公司 | Method for inhibiting ice melting induced voltage of earth wire of uninterrupted AC line |
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Cited By (12)
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| CN110581640A (en) * | 2018-06-11 | 2019-12-17 | 中车株洲电力机车研究所有限公司 | Control method and system of multi-module direct parallel converter and storage medium |
| CN110581640B (en) * | 2018-06-11 | 2021-06-08 | 中车株洲电力机车研究所有限公司 | Control method and system of multi-module direct parallel converter and storage medium |
| CN109039096A (en) * | 2018-08-29 | 2018-12-18 | 浙江双驰电气科技有限公司 | A kind of concrete pump power supply using electrolytic capacitor energy storage |
| CN109921662A (en) * | 2019-03-25 | 2019-06-21 | 哈工大（张家口）工业技术研究院 | The control method of high-frequency isolation type variable topology AC-DC converter |
| CN110995034A (en) * | 2019-12-11 | 2020-04-10 | 西安西电电力系统有限公司 | Current sharing control method and device for parallel current sources |
| CN110995034B (en) * | 2019-12-11 | 2021-02-12 | 西安西电电力系统有限公司 | Current sharing control method and device for parallel current sources |
| CN113300307A (en) * | 2021-04-29 | 2021-08-24 | 珠海万力达电气自动化有限公司 | Railway power system interconnection equipment with dual-network ice melting function and control method |
| CN113300307B (en) * | 2021-04-29 | 2022-12-27 | 珠海万力达电气自动化有限公司 | Railway power system interconnection equipment with dual-network ice melting function and control method |
| CN113451973A (en) * | 2021-08-09 | 2021-09-28 | 河南卫华重型机械股份有限公司 | Integrated trolley line alternating-current ice melting controller |
| CN114355050A (en) * | 2021-12-02 | 2022-04-15 | 贵州电网有限责任公司 | Online identification method for dq impedance of MMC type direct-current ice melting device |
| CN117175523A (en) * | 2023-11-03 | 2023-12-05 | 中国电力工程顾问集团西南电力设计院有限公司 | Method for inhibiting ice melting induced voltage of earth wire of uninterrupted AC line |
| CN117175523B (en) * | 2023-11-03 | 2024-01-26 | 中国电力工程顾问集团西南电力设计院有限公司 | Method for inhibiting ice melting induced voltage of earth wire of uninterrupted AC line |
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