CN108242816A - A kind of Three-Phase Parallel multi-functional converter and its method of work - Google Patents
A kind of Three-Phase Parallel multi-functional converter and its method of work Download PDFInfo
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- CN108242816A CN108242816A CN201611223081.7A CN201611223081A CN108242816A CN 108242816 A CN108242816 A CN 108242816A CN 201611223081 A CN201611223081 A CN 201611223081A CN 108242816 A CN108242816 A CN 108242816A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- 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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a kind of Three-Phase Parallel multi-functional converter and its method of work, the Three-Phase Parallel multi-functional converter includes：DC side switch module, reverse-filling diode, DC filter capacitor, inverter module, filter inductor and exchange side switch module.The microprocessor module of the current transformer acquires the input current of frequency converter come the operating mode of determination device according to the load current sampling module：Wherein energy feedback pattern is by the braking energy feedback of motor to power grid, and active power filtering pattern is by the way that power grid injection and load harmonic current opposite in phase, amplitude identical compensation electric current reduces the harmonic components in power network current.Two kinds of operating modes utilize identical DC filter capacitor, inverter module and filter inductor；Microprocessor module flexibly selects operating mode, system availability is high by controlling the switching of DC side switch module.
Description
Technical field
The present invention relates to technical field of electric power more particularly to a kind of Three-Phase Parallel multi-functional converter and its work sides
Method.
Background technology
Frequency converter is using converter technique and microelectric technique, is handed over by changing motor working power Frequency Patterns to control
The electric control appliance of galvanic electricity motivation.Frequency converter is mainly by rectification, filtering, inversion, brake unit, driving unit, detection unit
The compositions such as microprocessing unit.Conducting and the shutdown of frequency converter device for power switching close to the inner portion adjust the voltage of out-put supply and frequency
Rate provides its required supply voltage, and then achieve the purpose that energy saving, speed governing according to the actual needs of motor.With work
The continuous improvement of industry the degree of automation, frequency converter have also obtained very extensive application.
When Frequency Converter Control motor operation is in motoring condition, motor drag load operation converts electrical energy into load
Mechanical energy.Since the rectifying part of frequency converter is generally using diode uncontrollable rectifier device, it is the occurring source of a higher harmonics,
Harmonic wave caused by frequency converter can generate electric power network serious interference, shadow for this interference electric system big to capacity
Sound is not fairly obvious, but for the small system of capacity, the interference that harmonic wave generates is with regard to very important.When Frequency Converter Control electricity
Machine operation in the braking state when, motor be in regenerative power generation state, and stored mechanical energy is by motor in load transmission system
Electric energy is converted into, the dc bus of frequency converter is fed back to by the afterflow anti-paralleled diode of inverter, frequency converter is inverse at this time
Become module and be in rectification state, the raising that these energy will lead to DC bus-bar voltage influences the safe and stable operation of system.
Frequency convertor system has energy expenditure type, parallel connection direct to the major way being absorbed and utilized of regenerating braking energy at present
Busbar absorption-type, energy feedback type, four-quadrant frequency converter and energy storage type etc., wherein：(1) energy expenditure type Land use systems are
An in parallel braking resistor in direct-current loop of frequency converter controls the logical of power tube by detecting DC bus-bar voltage
It is disconnected.When DC bus-bar voltage rises to the voltage quasi position of setting, regeneration energy is passed through resistance, with thermal energy by power tube conducting
Form consume, so as to prevent the rising of DC voltage.Since regeneration energy could not be utilized, it is consequently belonging to energy expenditure
Type.It is simple using the energy expenditure type Land use systems principle of braking resistor, but there are energy dissipations, efficiency is low, resistance heating
Seriously, increase heat dissipation cost.(2) parallel connection direct busbar absorption-type Land use systems are suitable for multi-cell drive system, in the system
In, every motor is both needed to a frequency converter, and more frequency converters share a net side current transformer, and all inverter modules are attempted by one
On public direct-flow bus wire.In the system, often there is one or several motors work in on-position, the electricity in on-position
Machine is in the electricity of motoring condition by parallel connection direct busbar again by other motor runs, generation regeneration energy, these energy
Machine is absorbed.Energy feedback type Land use systems are by an external device (ED) independently of frequency convertor system, the device and frequency conversion
The dc bus of device is in parallel, by the energy feedback of motor regenerative braking to power grid.Rectification link is not controlled using diode whole
For the frequency converter of stream, on the one hand which can ensure the safe and stable operation of frequency converter, on the other hand can reach energy saving
The purpose of consumption reduction saves the operating cost of frequency convertor system.(3) rectifier bridge of four-quadrant frequency converter uses IGBT (Insulated
Gate Bipolar Transistor, IGBT) as device for power switching, using PWM (Pulse Width Moduration)
Commutation technique can realize the two-way flow of energy, reach energy-efficient purpose to greatest extent, and the harmonic wave that it can also reduce power grid is dirty
Dye adjusts the input power factor of power grid close to 1.But its control mode is complex, cost is higher, is wanted to power grid
Not high application scenario is asked not apply to.(4) energy storage type Land use systems are that the energy energy storage device of motor braking is temporary
It stores, uses when needed.Energy storage method can be collected efficiently and store the energy of braking recycling, without by power grid electricity
The limitation of current voltage stability is eliminated using the energy expenditure mode that braking resistor radiates to influence caused by environment.Energy storage list
Member can be traditional energy storage device, such as plumbic acid, ni-Cd energy-storage battery；Can also be novel energy storage device, as superconduction is stored up
Can, compressed-air energy storage, ultracapacitor energy storage, flywheel energy storage etc..The frequent and larger braking power occasion in motor braking,
The regenerating braking energy of motor is absorbed according to energy storage device, then requires energy storage device that there is very big power and capacity, leads
Volume and cost is caused to increase.
Invention content
The present invention provides a kind of safety and stability, energy-efficient Three-Phase Parallel multi-functional converter and its work sides
Method.
Realize the object of the invention technical solution be：A kind of Three-Phase Parallel multi-functional converter, including sequentially connecting
The DC side switch module connect, reverse-filling diode, DC filter capacitor, inverter module, filter inductor, exchange side switch
Component further includes microprocessor module, network voltage sampling module, load current sampling module, DC bus-bar voltage sampling mould
Block, output current sampling module：
The DC side switch module is connected between DC bus capacitor of frequency converter and current transformer reverse-filling diode；
The reverse-filling diode is formed using a power diode, is serially connected in direct current positive bus or direct current negative busbar
On or formed using two power diodes, be serially connected in respectively in direct current positive bus and direct current negative busbar；
One end of the exchange side switch module is connected with filter inductor, and the other end is connected with the input terminal of power grid；
After the network voltage sampling module is in parallel with power grid, three phase network phase voltage is sampled, and is sent to micro-
Processor module；
The load current sampling module is connected between power grid and frequency converter diode uncontrollable rectifier bridge；Load current
Sampling module samples, and send microprocessor module to the input current of frequency convertor system diode uncontrollable rectifier bridge；
The DC bus-bar voltage sampling module is connected in parallel on the both ends of DC filter capacitor, on DC filter capacitor
Busbar voltage is sampled, and sends microprocessor module to；
The output current sampling module is connected between inverter module and filter inductor, filter inductor and friendship
Between stream side switch module or between exchange side switch module and power grid；Output current sampling module is more to Three-Phase Parallel
The output current of function current transformer is sampled, and sends microprocessor module to；
The microprocessor module, the frequency converter diode uncontrollable rectifier bridge sent according to load current sampling module
Input current signal, determine the on off state of DC side switch module, the working condition of inverter module controlled, so as to select
Three-Phase Parallel multi-functional converter is operated in energy feedback pattern or active power filtering pattern.
Preferably, the reverse-filling diode is formed using two power diodes, be serially connected in respectively direct current positive bus and
In direct current negative busbar；The anode of the DC filter capacitor is connected with the cathode of a power diode, the power diode
Anode is connected by DC side switch module with the direct current positive bus terminal of frequency converter；The cathode of the DC filter capacitor with it is another
The anode of one power diode is connected, and the cathode of the power diode is born by the direct current of DC side switch module and frequency converter
Busbar terminal is connected.
Further, the inverter module using two level three-phase bridge circuits, three-level three-phase bridge circuit or
Three single-phase bridge circuits.
Further, the filter inductor is formed or is used a three-phase using three independent single-phase inductors
The reactor of magnetic core altogether.
Further, when the DC side switch module is closed, exchange side switch module is closed, the inverter module
Energy feedback state, filtered inductor and exchange side switch module are operated in, by the DC voltage on DC filter capacitor
The alternating voltage of power grid is reverse into, energy is fed back in power grid.
Further, when the DC side switch module disconnects, exchange side switch module is closed, the inverter module
Active power filtering state, filtered inductor and exchange side switch module are operated in, to power grid injection and load harmonic current phase
Position is on the contrary, the identical compensation electric current of amplitude.
Further, the DC filter capacitor uses single electrolytic capacitor, two electrolytic capacitors or more electrolytic capacitors
Connection in series-parallel forms.
A kind of method of work based on the Three-Phase Parallel multi-functional converter, step are as follows：
First, network voltage sampling module carries out three-phase voltage sampling to power grid, and sends microprocessor module to；Direct current
Busbar voltage sampling module samples the busbar voltage on DC filter capacitor, and sends microprocessor module to；Load
Current sampling module samples the three-phase current of frequency converter input side, and sends microprocessor module to；Output current is adopted
Egf block samples the output current of Three-Phase Parallel multi-functional converter, and sends microprocessor module to；
Secondly, the frequency converter diode uncontrollable rectifier bridge that microprocessor module is sent according to load current sampling module
Input current signal, determine the on off state of DC side switch module, the working condition of inverter module controlled, so as to select
Three-Phase Parallel multi-functional converter is operated in energy feedback pattern or active power filtering pattern.
Further, the frequency converter diode that the microprocessor module is sent according to load current sampling module is not
The input current signal of rectifier bridge is controlled, determines the on off state of DC side switch module, it is specific as follows：
When the load current sampling module sampling frequency converter input current is less than the limit value of setting, micro- place
Reason device module selection Three-Phase Parallel multi-functional converter is operated in energy feedback operating mode, sends out control signal by DC side
Switch module is closed, by the energy feedback being had more on DC filter capacitor to power grid；
When the load current sampling module sampling frequency converter input current is more than the limit value of setting, micro- place
Reason device module selection Three-Phase Parallel multi-functional converter is operated in active power filtering operating mode, sends out control signal by DC side
Switch module disconnects, and the inverter module is controlled to export and load harmonic current opposite in phase, the identical compensation electricity of amplitude
Stream.
Compared with prior art, the present invention its remarkable advantage is：(1) there is energy feedback, it can be by motor again
The energy feedback of raw braking ensures the safe and stable operation of frequency converter, reduces using braking resistor, reduce energy wave to power grid
Take, improve equipment installation environment；(2) there is active power filtering, it can be when transducer drive motor runs well, to becoming
The harmonic current that frequency device generates compensates, and reduces the pollution to utility network, purifies power grid environment；(3) current transformer provided
System has both energy feedback and active power filtering operating mode, both operating modes all use same set of DC filter capacitor, inverse
Become device module and filter inductor；Microprocessor module flexibly selects Working mould by controlling the switching of DC side switch module
Formula improves utilization rate of equipment and installations.
Description of the drawings
Illustrate the embodiment of the present invention in order to clearer, attached drawing needed in the embodiment will be made briefly below
It introduces, it should be apparent that, the accompanying drawings in the following description is only the embodiment of the present invention, and those of ordinary skill in the art are come
It says, without creative efforts, other attached drawings can also be obtained with reference to the accompanying drawings.
Fig. 1 is the system structure diagram of the invention device.
Fig. 2 is the energy relationship schematic diagram that the invention device is operated under energy feedback pattern.
Fig. 3 is the energy relationship schematic diagram that the invention device is operated under active power filtering pattern.
Specific embodiment
Below in conjunction with attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that institute
The embodiment of description is only part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
All other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made belongs to this
Invent the range of protection.
With reference to Fig. 1, Three-Phase Parallel multi-functional converter of the present invention, including DC side switch module 121 connected in sequence,
Reverse-filling diode 122, DC filter capacitor 123, inverter module 124, filter inductor 125, exchange side switch module
126, further include microprocessor module 141, network voltage sampling module 131, load current sampling module 132, dc bus electricity
Press sampling module 133, output current sampling module 134：
The DC side switch module 121 is connected to DC bus capacitor of frequency converter and current transformer reverse-filling diode
Between 122；
The reverse-filling diode 122 is formed using a power diode, is serially connected in direct current positive bus or direct current is born
It forms, is serially connected in respectively in direct current positive bus and direct current negative busbar on busbar or using two power diodes；
One end of the exchange side switch module 126 is connected with filter inductor 125, the input terminal phase of the other end and power grid
Even；
After the network voltage sampling module 131 is in parallel with power grid, three phase network phase voltage is sampled, and sends to
Microprocessor module 141；
The load current sampling module 132 is connected between power grid and frequency converter diode uncontrollable rectifier bridge；Load electricity
Stream sampling module 132 samples, and send microprocessor to the input current of frequency convertor system diode uncontrollable rectifier bridge
Module 141；
The DC bus-bar voltage sampling module 133 is connected in parallel on the both ends of DC filter capacitor 123, to DC filtering electricity
Busbar voltage in appearance is sampled, and sends microprocessor module 141 to；
The output current sampling module 134, is connected between inverter module 124 and filter inductor 125, filtered electrical
Between sensor 125 and exchange side switch module 126 or between exchange side switch module 126 and power grid；Output current samples mould
Block 134 samples the output current of Three-Phase Parallel multi-functional converter, and sends microprocessor module 141 to；
The microprocessor module 141, the frequency converter diode sent according to load current sampling module 132 are not controlled
The input current signal of rectifier bridge determines the on off state of DC side switch module 121, controls the work of inverter module 124
State, so as to which Three-Phase Parallel multi-functional converter be selected to be operated in energy feedback pattern or active power filtering pattern.
As a kind of concrete scheme, the reverse-filling diode 122 is formed using two power diodes, is serially connected in respectively
In direct current positive bus and direct current negative busbar；The anode of the DC filter capacitor 123 is connected with the cathode of a power diode,
The anode of the power diode is connected by DC side switch module 121 with the direct current positive bus terminal of frequency converter；The direct current
The cathode of filter capacitor 123 is connected with the anode of another power diode, and the cathode of the power diode is opened by DC side
Component 121 is closed with the direct current negative busbar terminal of frequency converter to be connected.
Further, the inverter module 124 using two level three-phase bridge circuits, three-level three-phase bridge circuit or
Three single-phase bridge circuits of person.
Further, the filter inductor 125 is formed or is used one three using three independent single-phase inductors
Mutually it is total to the reactor of magnetic core.
Further, when the DC side switch module 121 is closed, exchange side switch module 126 is closed, the inversion
Device module 124 is operated in energy feedback state, filtered inductor 125 and exchange side switch module 126, by DC filtering electricity
Hold the alternating voltage that the DC voltage on 123 is reverse into power grid, energy is fed back in power grid.
Further, when the DC side switch module 121 disconnects, exchange side switch module 126 is closed, the inversion
Device module 124 is operated in active power filtering state, filtered inductor 125 and exchange side switch module 126, to power grid injection with
Load harmonic current opposite in phase, the identical compensation electric current of amplitude.
Further, the DC filter capacitor 123 is using single electrolytic capacitor, two electrolytic capacitors or more electrolysis electricity
Hold connection in series-parallel composition.
A kind of method of work based on the Three-Phase Parallel multi-functional converter, step are as follows：
First, network voltage sampling module 131 carries out three-phase voltage sampling to power grid, and sends microprocessor module to
141；DC bus-bar voltage sampling module 133 samples the busbar voltage on DC filter capacitor 123, and sends micro- place to
Manage device module 141；Load current sampling module 132 samples the three-phase current of frequency converter input side, and sends micro- place to
Manage device module 141；Output current sampling module 134 samples the output current of Three-Phase Parallel multi-functional converter, and
Send microprocessor module 141 to；
Secondly, the frequency converter diode that microprocessor module 141 is sent according to load current sampling module 132 is not controlled
The input current signal of rectifier bridge determines the on off state of DC side switch module 121, controls the work of inverter module 124
State, so as to which Three-Phase Parallel multi-functional converter be selected to be operated in energy feedback pattern or active power filtering pattern.
Further, the frequency converter two that the microprocessor module 141 is sent according to load current sampling module 132
The input current signal of pole pipe uncontrollable rectifier bridge determines the on off state of DC side switch module 121, specific as follows：
It is described when the 132 sampling frequency converter input current of load current sampling module is less than the limit value of setting
Microprocessor module 141 selects Three-Phase Parallel multi-functional converter to be operated in energy feedback operating mode, sends out control signal
DC side switch module 121 is closed, by the energy feedback being had more on DC filter capacitor 123 to power grid；
It is described when the 132 sampling frequency converter input current of load current sampling module is more than the limit value of setting
Microprocessor module 141 selects Three-Phase Parallel multi-functional converter to be operated in active power filtering operating mode, sends out control signal
DC side switch module 121 is disconnected, the inverter module 124 is controlled to export and load harmonic current opposite in phase, width
It is worth identical compensation electric current.
Embodiment 1
The present invention is based on energy feedback unit of the prior art and active filters, innovatively propose a kind of parallel three phase
Type multi-functional converter realizes Three-Phase Parallel multi-functional converter Working mould by controlling the break-make of DC side switch module
The switching of formula so as to achieve the purpose that two kinds of functions are realized in an equipment, improves utilization rate of equipment and installations.
The present invention provides a kind of Three-Phase Parallel multi-functional converters.It is the embodiment of the present invention 110 and change with reference to Fig. 1
The system structure diagram of frequency device system.Frequency convertor system mainly includes diode uncontrollable rectifier bridge 102, dc-link capacitance
103, resistive braking unit 104, the inversion bridge 105 of IGBT switching power devices composition.Power grid 101 is not controlled with diode
The input terminal of rectifier bridge 102 is connected, and the output terminal of inversion device 105 is connected with motor 106.
When motor 106 is in motor-operated running state, the energy of power grid 101, by diode uncontrollable rectifier bridge 102, directly
It flows bus capacitor 103 and inversion bridge 105 and provides electric energy to motor 106.
When motor 106 is in brake running state, the regenerating braking energy of motor 106 passes through inversion bridge 105
The anti-paralleled diode of 6 IGBT of three-phase bridge arm pours into DC bus capacitor of frequency converter 103, causes DC bus-bar voltage liter
It is high.When limit value of the DC bus-bar voltage higher than setting, resistive braking unit 104 starts running, will be extra on dc bus
Energy is consumed by resistance heating, and preventing busbar voltage from continuing raising causes frequency converter to damage, and endangers whole system safety.
Fig. 1 gives a kind of specific embodiment of apparatus of the present invention 110, mainly includes DC side switch module 121, prevents
Pour in down a chimney diode 122, DC filter capacitor 123, inverter module 124, filter inductor 125, exchange side switch module 126.
It further includes：Microprocessor module 141, network voltage sampling module 131, load current sampling module 132, DC bus-bar voltage is adopted
Egf block 133, output current sampling module 134.According to the control strategy of design, microprocessor module 141 is according to load current
The input current signal of frequency converter diode uncontrollable rectifier bridge that sampling module 132 is sent determines DC side switch module
121 on off state controls the working condition of inverter module 124, so as to which Three-Phase Parallel multi-functional converter be selected to work
In energy feedback pattern or active power filtering pattern.
The DC side switch module 121 is connected to DC bus capacitor of frequency converter 103 and two pole of current transformer reverse-filling
Between pipe 122.In the present embodiment, DC side switch module 121 uses the dedicated D.C. contactor of frequency converter.
The reverse-filling diode 122 can be formed with a power diode, be serially connected in direct current positive bus or direct current
In negative busbar, two power diodes can also be used to form, be serially connected in respectively in direct current positive bus and direct current negative busbar.At this
In embodiment, reverse-filling diode 122 uses two power diodes.
The DC filter capacitor 123 can use single electrolytic capacitor, two electrolytic capacitors or more electrolytic capacitor strings
It composes in parallel.In the present embodiment, DC filter capacitor 123 is by two electrolytic capacitor series connection groups of capacitance C21 and capacitance C22
Into.
Two level three-phase bridge circuits, three-level three-phase bridge circuit, three single-phase bridges can be used in inverter module 124
Circuit.In the present embodiment, inverter module 124 samples two level three-phase bridge circuits, and three-phase bridge arm is by 3 PIM (Power
Integrated Module, PIM) integrated power module forms, 2 device for power switching, each IGBT are included in each module
Device for power switching includes the antiparallel power diode composition therewith of a semiconductor switch device and one.In the present embodiment
It is middle to use IGBT (Insulated Gate Bipolar Transistor, IGBT) as device for power switching.
One end of filter inductor 125 is connected with the output terminal of inverter module 124, the other end and exchange side switch module
126 one end is connected.Filter inductor 125 can be made of three independent single-phase inductors or a three-phase is total to
The reactor of magnetic core.In the present embodiment, filter inductor 125 is made of three independent one-phase core inductors.
One end of exchange side switch module 126 is connected with filter inductor 125, the input terminal phase of the other end and power grid 101
Even.In the present embodiment, exchange side switch module 126 uses three-phase alternating current electromagnetic contactor.
Apparatus of the present invention further include：
Network voltage sampling module 131, it is in parallel with power grid 101, three phase network phase voltage is sampled, and by conditioning
After processing of circuit, microprocessor module 141 is sent to.In the present embodiment, network voltage sampling uses Hall voltage to pass
Sensor.
Load current sampling module 132 is connected between power grid 101 and frequency converter diode uncontrollable rectifier bridge 102, herein
It should be noted that the exchange side switch module 126 due to Three-Phase Parallel multi-functional converter 110 is also connected to power grid 101
Between frequency converter diode uncontrollable rectifier bridge 102, the needs of load current sampling module 132 are connected to close to frequency converter diode
This side of uncontrollable rectifier bridge 102.Input of the load current sampling module 132 to frequency convertor system diode uncontrollable rectifier bridge 102
Electric current is sampled, and after modulate circuit is handled, and sends microprocessor module 141 to.In the present embodiment, load current
Sampling uses Hall current sensor.
DC bus-bar voltage sampling module 133 is connected in parallel on the both ends of DC filter capacitor 123, to DC filter capacitor
On busbar voltage sampled, and after modulate circuit is handled, send microprocessor module 141 to.In the present embodiment,
DC bus-bar voltage sampling uses Hall voltage sensor.
Output current sampling module 134 can be connected between inverter module 124 and filter inductor 125, can also
It is connected between filter inductor 125 and exchange side switch module 126, exchange side switch module 126 and electricity can also be connected to
Between net 101.In the present embodiment ,] output current sampling module 134 be connected to exchange side switch module 126 and power grid 101 it
Between, using Hall current sensor.
With reference to Fig. 1, how the Three-Phase Parallel multi-functional converter 110 that the present invention will be described in detail realizes the one of energy feedback
A specific implementation method.
When motor 106 is in brake running state, the regenerating braking energy generated is by inversion bridge 105
The anti-paralleled diode of device for power switching is poured on dc-link capacitance 103, and DC bus-bar voltage is caused to increase, as direct current mother
Line voltage be more than frequency converter input side line voltage peak value when, diode uncontrollable rectifier bridge 102 due to reversely end without work,
It is zero to lead to input current.Microprocessor module 141 according to load current sampling module 132 transmit come load current signal sentence
Disconnected motor 106 at this time should be at brake running state, sends out control signal and is closed DC side switch module 121.At this point, motor
The energy of 106 regenerative brakings is transmitted to from DC bus capacitor of frequency converter 103 on the dc bus of 110 device of current transformer, is made
The voltage raising of DC filter capacitor 123 is obtained, when 110 DC bus-bar voltage of current transformer increases the limitation for reaching setting, micro- place
Reason device 141 sends out control signal and is closed exchange side switch module 126 and inverter module 124 is controlled to be allowed in energy feedback
Operating mode, by the energy feedback on DC bus capacitor of frequency converter 103 to power grid 101.Its energy flow relationship is as in Fig. 2
Shown in dotted line with the arrow.
When motor 106 is in motor-operated running state, the energy of power grid 101, by frequency converter diode uncontrollable rectifier bridge
102, dc-link capacitance 103 and inversion bridge 105 provide electric energy to motor 106.At this point, frequency converter input side electric current is humorous
Wave content is larger, and serious harmonic pollution will be generated to power grid, and the harmonic wave that frequency converter generates will influence to be connected on same power grid
The operation of other loads.Microprocessor module 141 according to load current sampling module 132 transmission come load current signal judgement
Motor 106 should be at motor-operated running state at this time, sends out control signal and disconnects DC side switch module 121 and control inverter mould
Block 124 is allowed in active power filtering operating mode, filtered inductor 125, to power grid injection and load harmonic current phase
On the contrary, the compensation electric current that amplitude is identical.Its energy flow relationship is as shown in the dotted line with the arrow in attached drawing 3.
Above example is merely illustrative, and protection scope of the present invention is not limited by the specific embodiment.For
For those skilled in the art, above description is readily appreciated that, only presently preferred embodiments of the present invention, should not be with limitation
The present invention is not departing from present inventive concept and any modification that scope of the claimed protection is made, equivalent replacement
With optimization etc., these belong to the present invention protection within.
Claims (9)
1. a kind of Three-Phase Parallel multi-functional converter, which is characterized in that including DC side switch module connected in sequence
(121), reverse-filling diode (122), DC filter capacitor (123), inverter module (124), filter inductor (125), friendship
Side switch module (126) is flowed, further includes microprocessor module (141), network voltage sampling module (131), load current sampling
Module (132), DC bus-bar voltage sampling module (133), output current sampling module (134)：
The DC side switch module (121) is connected to DC bus capacitor of frequency converter and current transformer reverse-filling diode
(122) between；
The reverse-filling diode (122) is formed using a power diode, is serially connected in direct current positive bus or direct current bears mother
It forms, is serially connected in respectively in direct current positive bus and direct current negative busbar on line or using two power diodes；
One end of the exchange side switch module (126) is connected with filter inductor (125), the input terminal phase of the other end and power grid
Even；
After the network voltage sampling module (131) is in parallel with power grid, three phase network phase voltage is sampled, and sends to micro-
Processor module (141)；
The load current sampling module (132) is connected between power grid and frequency converter diode uncontrollable rectifier bridge；Load current
Sampling module (132) samples, and send microprocessor to the input current of frequency convertor system diode uncontrollable rectifier bridge
Module (141)；
The DC bus-bar voltage sampling module (133) is connected in parallel on the both ends of DC filter capacitor (123), to DC filtering electricity
Busbar voltage in appearance is sampled, and sends microprocessor module (141) to；
The output current sampling module (134) is connected between inverter module (124) and filter inductor (125), filters
Between inductor (125) and exchange side switch module (126) or exchange side switch module (126) is between power grid；Output electricity
Stream sampling module (134) samples the output current of Three-Phase Parallel multi-functional converter, and send microprocessor mould to
Block (141)；
The microprocessor module (141), does not control according to the frequency converter diode that load current sampling module (132) is sent
The input current signal of rectifier bridge determines the on off state of DC side switch module (121), control inverter module (124)
Working condition, so as to which Three-Phase Parallel multi-functional converter be selected to be operated in energy feedback pattern or active power filtering pattern.
2. Three-Phase Parallel multi-functional converter according to claim 1, special to be, the reverse-filling diode
(122) it is formed, is serially connected in respectively in direct current positive bus and direct current negative busbar using two power diodes；The DC filtering electricity
The anode for holding (123) is connected with the cathode of a power diode, and the anode of the power diode passes through DC side switch module
(121) it is connected with the direct current positive bus terminal of frequency converter；The cathode of the DC filter capacitor (123) and another two pole of power
The anode of pipe is connected, and the cathode of the power diode passes through the direct current negative busbar end of DC side switch module (121) and frequency converter
Son is connected.
3. Three-Phase Parallel multi-functional converter according to claim 1, special to be, the inverter module
(124) using two level three-phase bridge circuits, three-level three-phase bridge circuit or three single-phase bridge circuits.
4. Three-Phase Parallel multi-functional converter according to claim 1, special to be, the filter inductor
(125) form or use a three-phase to be total to the reactor of magnetic core using three independent single-phase inductors.
5. Three-Phase Parallel multi-functional converter according to claim 1, special to be, the DC side switch module
(121) when closure, exchange side switch module (126) are closed, the inverter module (124) is operated in energy feedback state,
Filtered inductor (125) and exchange side switch module (126), by the DC voltage inversion on DC filter capacitor (123)
Into the alternating voltage of power grid, energy is fed back in power grid.
6. Three-Phase Parallel multi-functional converter according to claim 1, special to be, the DC side switch module
(121) when disconnection, exchange side switch module (126) are closed, the inverter module (124) is operated in active power filtering state,
Filtered inductor (125) and exchange side switch module (126), to power grid injection and load harmonic current opposite in phase, width
It is worth identical compensation electric current.
7. Three-Phase Parallel multi-functional converter according to claim 1 or 2, special to be, the DC filtering electricity
Hold (123) using single electrolytic capacitor, two electrolytic capacitors or more electrolytic capacitor connection in series-parallel compositions.
8. a kind of method of work based on Three-Phase Parallel multi-functional converter described in claim 1, special to be, step is such as
Under：
First, network voltage sampling module (131) carries out three-phase voltage sampling to power grid, and sends microprocessor module to
(141)；DC bus-bar voltage sampling module (133) samples, and transmit the busbar voltage on DC filter capacitor (123)
Give microprocessor module (141)；Load current sampling module (132) samples the three-phase current of frequency converter input side, and
Send microprocessor module (141) to；Output current sampling module (134) is to the output electricity of Three-Phase Parallel multi-functional converter
Stream is sampled, and sends microprocessor module (141) to；
Secondly, microprocessor module (141) is not controlled according to the frequency converter diode that load current sampling module (132) is sent
The input current signal of rectifier bridge determines the on off state of DC side switch module (121), control inverter module (124)
Working condition, so as to which Three-Phase Parallel multi-functional converter be selected to be operated in energy feedback pattern or active power filtering pattern.
9. the method for work of Three-Phase Parallel multi-functional converter according to claim 8, special to be, the microprocessor
The input electricity for the frequency converter diode uncontrollable rectifier bridge that device module (141) is sent according to load current sampling module (132)
Signal is flowed, determines the on off state of DC side switch module (121), it is specific as follows：
When described load current sampling module (132) the sampling frequency converter input current is less than the limit value of setting, described is micro-
Processor module (141) selection Three-Phase Parallel multi-functional converter is operated in energy feedback operating mode, sends out control signal
DC side switch module (121) is closed, by the energy feedback being had more on DC filter capacitor (123) to power grid；
When described load current sampling module (132) the sampling frequency converter input current is more than the limit value of setting, described is micro-
Processor module (141) selection Three-Phase Parallel multi-functional converter is operated in active power filtering operating mode, sends out control signal
DC side switch module (121) is disconnected, controls the inverter module (124) output and load harmonic current phase phase
Instead, the identical compensation electric current of amplitude.
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| CN113346769A (en) * | 2021-06-01 | 2021-09-03 | 北京交通大学 | Hybrid rectifying device |
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| CN114244188A (en) * | 2021-12-24 | 2022-03-25 | 无锡新马赫动力控制有限公司 | Braking energy recovery system, frequency conversion all-in-one machine and working method |
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| CN117200648B (en) * | 2023-11-07 | 2024-01-26 | 浙江大学 | Control device for power supply harmonic wave of alternating current motor driven by multiple inverters |
| CN118130889A (en) * | 2024-05-08 | 2024-06-04 | 山东艾克索仑电气有限公司 | Current detection device and method for alternating current frequency converter |
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