CN108336763B - Active and reactive decoupling control-based parallel connection method of H-bridge cascaded shore power supply - Google Patents
Active and reactive decoupling control-based parallel connection method of H-bridge cascaded shore power supply Download PDFInfo
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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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
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a parallel connection method of an H-bridge cascade shore power supply based on active and reactive decoupling control, which can realize parallel connection of a plurality of high-high shore power supplies so as to enlarge the capacity of the shore power supply. In the whole process, the current can be quickly tracked, the power is effectively equally divided, the circulation phenomenon is avoided, the direct current bus voltage is effectively stabilized, and the operation reliability of the system is improved.
Description
Technical Field
The invention relates to a parallel connection method of an H-bridge cascade shore power supply based on active and reactive decoupling control, and belongs to the technical field of high-voltage shore power supply parallel connection control.
Background
The shore power system is mainly divided into a low-voltage shore power system and a high-voltage shore power system, and the high-voltage shore power system is most widely applied. The high-voltage shore power system is generally realized by adopting two power supply modes, one mode is a high-low-high power supply scheme, the scheme is low in construction cost, low in efficiency, serious in harmonic pollution and high in cost, and is a scheme often adopted when the early high-voltage shore power system is immature. The other is a high-high shore power supply scheme directly adopting H-bridge cascade connection. With the demand of harbour on-shore power supply utilization, the demand of shore power supply capacity is continuously increased, and in order to save cost and improve the utilization rate of shore power supply, two or more high-high shore power supplies are often connected in parallel to meet the demand. In this way, the shore power supply can be used for independent power supply and can also be used for parallel combination power supply, and the shore power supply is convenient and flexible.
However, the parallel connection of the high-high shore power supplies becomes a new technical difficulty, and because the high-high shore power supplies adopt an H-bridge cascade topology structure, in order to reduce equipment cost, a diode rectification mode is adopted at a rectification side, and the problem of direct-current voltage overvoltage is easily caused by outgoing line circulation in parallel connection, so that the output of the high-high shore power supplies after parallel connection is unstable, and great influence is brought to loads and a power grid.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a parallel connection method of an H-bridge cascade shore power supply based on active and reactive decoupling control, which can realize parallel connection of a plurality of high-high shore power supplies so as to expand the capacity of the shore power supply. In the whole process, the current can be quickly tracked, the power is effectively equally divided, the circulation phenomenon is avoided, the direct current bus voltage is effectively stabilized, and the operation reliability of the system is improved.
The above object of the present invention is achieved by the following technical means: a parallel connection method of H-bridge cascade type shore power supplies based on active and reactive decoupling control is characterized in that a main loop of the parallel connection method is a high-high shore power variable frequency power supply based on H-bridge cascade, and the parallel connection method comprises a grid-connected switch G1, a pre-charging module M1, a rectifying link, a direct-current voltage link, an alternating-current inversion link, an output filtering link and a voltage and current detection and control link; the rectifying link comprises a phase-shifting transformer T1 and uncontrolled rectifying units 1-18; the direct-current voltage link comprises direct-current voltage units 1-18 and chopper units 1-18, and the alternating-current inversion link comprises H-bridge cascade inversion units 1-18; the output filtering link comprises an isolation transformer T2, filtering capacitors C1-C3, filtering reactors L1-L3 and an output switch G2;
the voltage and current detection and control link comprises a main power supply module and a control link of a slave power supply module, wherein the control link of the main power supply module comprises a main module voltage and current detection and a constant voltage and constant frequency controller; the control link of the slave power supply module comprises slave module voltage and current detection, an active and reactive decoupling controller and a current inner loop controller;
the rectification link adopts a phase-shifting transformer rectification technology, so that stable direct current bus voltage is provided for the alternating current inversion link, and harmonic waves are reduced; the system comprises a pre-charging module and a phase-shifting transformer T1 module, wherein the pre-charging module is responsible for smoothly charging a bus capacitor, so that impact current influence caused by quick charging is avoided;
the direct-current voltage link can quickly act when the direct-current voltage is over-voltage and stabilize the direct-current voltage, and comprises a direct-current side voltage detection module and a chopping unit module;
the alternating current inversion link adopts an H-bridge cascade topological structure, provides stable power output for a load, and comprises a carrier phase-shifting SVPWM modulator and a filtering unit module, wherein the carrier phase-shifting SVPWM modulator is matched with the H-bridge cascade topological structure for use, so that equivalent switching frequency is improved, and harmonic pollution is reduced;
the voltage and current detection and control link adopts a master-slave control method, the main power supply module adopts a constant-voltage constant-frequency control method to output stable voltage, and the slave power supply module is designed as a current follower to track the output current of the main power supply module, so that the output power is controlled, and the synchronous parallel connection of the master power supply module and the slave power supply module is realized. The specific control process is as follows:
(1) the main power supply module is started to operate firstly, a voltage set value Vref and a frequency set value Fref are used as control targets, output voltage is established, and meanwhile, the output voltages Ua, Ub and Uc are detected to form a closed loop with a given value so as to control the voltage and the frequency stability of an output side;
(2) the method comprises the steps that when output voltage is established outside a detection switch of a slave module, voltage and current signals are collected, firstly, the current value of a master module is synchronously detected according to the phase and the amplitude of the voltage signal of an output side, and the total output power of the master module and the slave module is calculated;
(3) when the total output power is greater than the parallel power starting value P _ uppet, the slave module starts to operate according to half of the real-time measured total active and reactive power value as a power control instruction so as to realize power equalization of parallel operation;
(4) in order to improve the response speed when heavy load is switched in, when the total output power is less than a parallel power starting value P _ uppet and the change rate of the total output power is greater than P _ detaSet, the slave module can be started immediately, and half of the total active and reactive power value measured in real time is used as a power control instruction to operate so as to improve the response when heavy load or impact load is switched in;
(5) the method comprises the steps that a main module runs at constant voltage, an auxiliary module regulates output power to run according to the real-time power value of the main module, and when the fact that the direct-current voltage of the auxiliary module rises and exceeds a direct-current voltage threshold value Vdc _ uppet or the total output power is reduced to be lower than a parallel connection exit set value P _ downSet is detected, the auxiliary module blocks output pulses and enters a standby state.
Compared with the prior art, the invention has the advantages that: the master module and the slave module in the invention all adopt a cascade H-bridge topological structure, thus overcoming the defect of insufficient tolerance of the power device, reducing the cost and improving the efficiency of later maintenance. On the premise of ensuring that the required power is met, the rectifying unit adopts a phase-shifting transformer technology, and the inverting unit module adopts a carrier phase-shifting SVPWM technology, so that the harmonic influence on a power grid is reduced. The control strategy of active and reactive decoupling and direct-current voltage composite suppression is adopted on the parallel technology, load and main power supply change can be quickly tracked, power equalization is effectively achieved, impact load influence is reduced, and power supply reliability is improved.
Drawings
FIG. 1 is a structural diagram of an H-bridge cascade shore power variable frequency power supply;
FIG. 2 is a block diagram of parallel control of an H-bridge cascaded shore power supply based on active and reactive decoupling control;
fig. 3 is a constant voltage and constant frequency control block diagram of the main power supply module;
FIG. 4 is an active and reactive control block diagram of the slave power supply module;
FIG. 5 is a bus voltage waveform on the DC side;
fig. 6 is an output current waveform of the main power supply module;
fig. 7 is an output current waveform from the power supply module.
Detailed Description
The present invention will be described in more detail with reference to examples.
The invention relates to a parallel connection method of an H-bridge cascade shore power supply based on active and reactive decoupling control, wherein a main loop of the parallel connection method is a high-high shore power variable frequency power supply based on H-bridge cascade, and the parallel connection method comprises a grid-connected switch G1, a pre-charging module M1, a rectifying link, a direct-current voltage link, an alternating-current inversion link, an output filtering link and a voltage and current detection and control link. The rectifying link comprises a phase-shifting transformer T1 and uncontrolled rectifying units 1-18; the direct-current voltage link comprises direct-current voltage units 1-18 and chopper units 1-18, and the alternating-current inversion link comprises H-bridge cascade inversion units 1-18; the output filtering link comprises an isolation transformer T2, filtering capacitors C1-C3, filtering reactances L1-L3 and an output switch G2.
The voltage and current detection and control link comprises a main power supply module and a control link of a slave power supply module, wherein the control link of the main power supply module comprises a main module voltage and current detection and a constant voltage and constant frequency controller; the control link of the slave power supply module comprises slave module voltage and current detection, an active and reactive decoupling controller and a current inner loop controller.
The voltage loop of the main power module is regulated as a voltage controller of the entire parallel system for controlling the output voltage of the parallel system. The output current signal of the main power supply module is used as the current reference signal of each slave power supply module, each slave module voltage controller does not participate in the regulation, and the current inner ring regulation adopts instantaneous current control to track the current change of the main power supply module at any time.
The rectification link adopts a phase-shifting transformer rectification technology, provides stable direct current bus voltage for the alternating current inversion link, and reduces harmonic waves. The bus capacitor pre-charging system comprises a pre-charging module and a phase-shifting transformer T1 module, wherein the pre-charging module is responsible for smoothly charging a bus capacitor, and impact current influence caused by quick charging is avoided.
The direct-current voltage link can rapidly act when the direct-current voltage is over-voltage and stabilize the direct-current voltage, and comprises a direct-current side voltage detection module and a chopping unit module.
The alternating current inversion link adopts an H-bridge cascade topological structure, provides stable power output for a load, and comprises a carrier phase-shifting SVPWM modulator and a filtering unit module, wherein the carrier phase-shifting SVPWM modulator is matched with the H-bridge cascade topological structure for use, so that equivalent switching frequency is improved, and harmonic pollution is reduced.
The voltage and current detection and control link adopts a master-slave control method, the main power supply module adopts a constant-voltage constant-frequency control method to output stable voltage, and the slave power supply module is designed as a current follower to track the output current of the main power supply module, so that the output power is controlled, and the synchronous parallel connection of the master power supply module and the slave power supply module is realized. The specific control process is as follows:
1. the main power supply module is started to operate firstly, a voltage set value Vref and a frequency set value Fref are used as control targets, output voltage is established, and meanwhile, the output voltages Ua, Ub and Uc are detected to form a closed loop with a given value so as to control the voltage and the frequency stability of an output side; the main power module acquires a frequency output given instruction frefGiven value of output voltage
Uq *0. And acquiring a voltage measured value through a voltage detection module. The measured value is obtained by changing Clark and Park, and the given value of voltage
And Uq *Comparing, and forming a given current value I after passing through a voltage controllerdref、IqrefSpecifically, the formula is:
wherein k ispuIs the proportionality coefficient of the voltage controller, kiuIs the integral coefficient of the voltage controller.
Obtaining a current measured value through a current detection module, wherein the measured value is a current value obtained after the measured value is changed through Clark and Park, and the current given value IdrefAnd IqrefAnd comparing, forming a modulation voltage through the current controller, outputting the modulation voltage to the SVPWM modulator to generate a corresponding control pulse, wherein the formula is as follows:
wherein k ispiIs the proportionality coefficient of the current controller, kiiIs the integral coefficient of the current controller.
2. The method comprises the steps that when output voltage is established outside a detection switch of a slave module, voltage and current signals are collected, firstly, the current value of a master module is synchronously detected according to the phase and the amplitude of the voltage signal of an output side, and the total output power of the master module and the slave module is calculated;
3. when the total output power is greater than the parallel power starting value P _ uppet, the slave module starts to operate according to half of the real-time measured total active and reactive power value as a power control instruction so as to realize power equalization of parallel operation; obtaining a given current value I from the output of a main power module by a slave power moduleref. And acquiring a current measured value through a current detection module of the power supply module. The measured value is obtained by changing Clark and Park, and is compared with the given value I of currentrefAnd comparing, forming a modulation voltage by the current controller, and outputting the modulation voltage to the SVPWM modulator to generate a corresponding control pulse.
4. In order to improve the response speed when heavy load is switched in, when the total output power is less than a parallel power starting value P _ uppet and the change rate of the total output power is greater than P _ detaSet, the slave module can be started immediately, and half of the total active and reactive power value measured in real time is used as a power control instruction to operate so as to improve the response when heavy load or impact load is switched in;
5. the method comprises the steps that a main module runs at constant voltage, an auxiliary module regulates output power to run according to the real-time power value of the main module, and when the fact that the direct-current voltage of the auxiliary module rises and exceeds a direct-current voltage threshold value Vdc _ uppet or the total output power is reduced to be lower than a parallel connection exit set value P _ downSet is detected, the auxiliary module blocks output pulses and enters a standby state;
the experimental waveforms of the high-high shore power supply parallel system based on master-slave control are shown in fig. 5, 6 and 7, wherein fig. 5 is a bus voltage waveform at a direct current side, and it can be seen that only small changes exist in direct current voltages of the master-slave modules at the time of parallel connection, so that the stability requirement of the direct current side voltage is met. Fig. 6 is an output current waveform of the main power supply module, and fig. 7 is an output current waveform of the slave power supply module, which shows that the slave module has a high response speed, and can well share the total load current, and the output voltage and current waveforms meet the power quality requirement.
The high-high shore power supply parallel system adopts the control mode, and can provide stable direct current bus voltage for an alternating current conversion link through direct current voltage control. Through a master-slave control mode, when shore power supplies are connected in parallel, the influence of impact current is reduced, the occurrence of a circulating current phenomenon is restrained, meanwhile, the influence caused by impact load is reduced, stable power supply output is provided, and the reliability of system power supply is improved.
The foregoing detailed description is exemplary only, and is intended to better enable others skilled in the art to understand the invention, and is not intended to limit the scope of the invention; any equivalent alterations or modifications made in accordance with the spirit of the present disclosure are within the scope of the present invention.
Claims (1)
1. A parallel connection method of H-bridge cascade type shore power supplies based on active and reactive decoupling control is characterized in that a main loop of the parallel connection method is a high-high shore power variable frequency power supply based on H-bridge cascade, and the parallel connection method comprises a grid-connected switch G1, a pre-charging module M1, a rectifying link, a direct-current voltage link, an alternating-current inversion link, an output filtering link and a voltage and current detection and control link; the rectifying link comprises a phase-shifting transformer T1 and uncontrolled rectifying units 1-18; the direct-current voltage link comprises direct-current voltage units 1-18 and chopper units 1-18, and the alternating-current inversion link comprises H-bridge cascade inversion units 1-18; the output filtering link comprises an isolation transformer T2, filtering capacitors C1-C3, filtering reactors L1-L3 and an output switch G2;
the voltage and current detection and control link comprises a main power supply module and a control link of a slave power supply module, wherein the control link of the main power supply module comprises a main module voltage and current detection and a constant voltage and constant frequency controller; the control link of the slave power supply module comprises slave module voltage and current detection, an active and reactive decoupling controller and a current inner loop controller;
the rectification link adopts a phase-shifting transformer rectification technology, so that stable direct current bus voltage is provided for the alternating current inversion link, and harmonic waves are reduced; the system comprises a pre-charging module and a phase-shifting transformer T1 module, wherein the pre-charging module is responsible for smoothly charging a bus capacitor, so that impact current influence caused by quick charging is avoided;
the direct-current voltage link can quickly act when the direct-current voltage is over-voltage and stabilize the direct-current voltage, and comprises a direct-current side voltage detection module and a chopping unit module;
the alternating current inversion link adopts an H-bridge cascade topological structure, provides stable power output for a load, and comprises a carrier phase-shifting SVPWM modulator and a filtering unit module, wherein the carrier phase-shifting SVPWM modulator is matched with the H-bridge cascade topological structure for use, so that equivalent switching frequency is improved, and harmonic pollution is reduced;
the voltage and current detection and control link adopts a master-slave control method, the main power supply module adopts a constant voltage and constant frequency control method to output stable voltage, and the slave power supply module is designed as a current follower to track the output current of the main power supply module so as to control the output power and realize synchronous parallel connection of the two; the specific control process is as follows:
(1) the main power supply module is started to operate firstly, a voltage set value Vref and a frequency set value Fref are used as control targets, output voltage is established, and meanwhile, the output voltages Ua, Ub and Uc are detected to form a closed loop with a given value so as to control the voltage and the frequency stability of an output side;
(2) the method comprises the steps that when output voltage is established outside a detection switch of a slave module, voltage and current signals are collected, firstly, the current value of a master module is synchronously detected according to the phase and the amplitude of the voltage signal of an output side, and the total output power of the master module and the slave module is calculated;
(3) when the total output power is greater than the parallel power starting value P _ uppet, the slave module starts to operate according to half of the real-time measured total active and reactive power value as a power control instruction so as to realize power equalization of parallel operation;
(4) in order to improve the response speed when heavy load is switched in, when the total output power is less than a parallel power starting value P _ uppet and the change rate of the total output power is greater than P _ detaSet, the slave module can be started immediately, and half of the total active and reactive power value measured in real time is used as a power control instruction to operate so as to improve the response when heavy load or impact load is switched in;
(5) the method comprises the steps that a main module runs at constant voltage, an auxiliary module regulates output power to run according to the real-time power value of the main module, and when the fact that the direct-current voltage of the auxiliary module rises and exceeds a direct-current voltage threshold value Vdc _ uppet or the total output power is reduced to be lower than a parallel connection exit set value P _ downSet is detected, the auxiliary module blocks output pulses and enters a standby state.
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Address after: 201210 3rd floor, building 1, No.400, Fangchun Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee after: Chengrui Power Technology (Shanghai) Co. Address before: 201315 3rd floor, building 1, No.400, Fangchun Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee before: CHENGRUI ELECTRIC POWER TECHNOLOGY (SHANGHAI) CO.,LTD. |