CN102646979A - Multi-module parallel DC (direct current) power supply and control method thereof - Google Patents
Multi-module parallel DC (direct current) power supply and control method thereof Download PDFInfo
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Abstract
The invention relates to a multi-module parallel DC power supply and a control method of the DC power supply. The multi-module parallel DC power supply comprises a monitor system and N DC power supply modules, wherein the monitor system includes a serial communication system, human-machine interaction equipment, and a digital control circuit; and the digital control circuit is respectively connected with the serial communication system and the human-machine interaction equipment. The control method comprises subjecting the output parameters and the set output parameters of all of the working DC power supply modules in each control period to corresponding control computation to make each DC power supply module to output current according to requirement and to realize current equalization. The multi-module parallel DC power supply provided by the invention can realize constant voltage or constant current function according to requirement, and is simple in process, few in wiring, easy in maintenance and so on. The control method of the power supply is simple in operation and reliable in control by adopting digital control. In constant voltage model, the dynamic performance of the multi-module parallel DC power supply is improved greatly, so that the multi-module parallel DC power supply can be directly applied in the digital DC power supply parallel connection system.
Description
Technical field
The present invention relates to industrial high power DC Switching Power Supply, be specifically related to a kind of multimode parallel connection direct power supply and control method thereof.
Background technology
At present, increase in the increasing demand of the various large power supplies of many industries, especially the demand of some high-power DC power supplies.But; The DC power supplier finite capacity often adopts the multimode parallel running, and its output energy is the several times of module output; Improved the power grade of DC power supply; The multimode parallel operation makes system have certain redundancy simultaneously, and module failure can not influence the operate as normal of this system, makes the reliability of whole system that large increase arranged.The multimode parallel running not only makes DC power supply have bigger power and reliability, but also has good versatility, and flexible combination becomes the system of various power as required.But most of high-power DC power supply of multimode parallel running at present all adopts the hard parallel operation pattern of constant current; Be difficult to realize the requirement of constant voltage mode; Though having the part power-supply system to adopt supervisory control system is that main principal and subordinate's control system has realized constant voltage mode; But its circuit and circuit design are all very complicated, and installation and maintenance are all very difficult.
Summary of the invention
In order to solve the problem of existing high-power DC power supply parallel operation, a kind of multimode parallel connection direct power supply and control method thereof have been proposed.Multimode parallel connection direct power supply of the present invention can be realized the constant voltage or the constant current function of power supply as required, has that technology is simple, wiring is few, is beneficial to advantage such as maintenance; Its control method adopts Digital Control, and is simple to operate, and control is reliable, and dynamic performance improves greatly when constant voltage mode, can directly apply in the digitlization DC power supply parallel system.
The present invention is achieved through following proposal: multimode parallel connection direct power supply comprises supervisory control system and N platform DC power supplier, N >=2; Said supervisory control system comprises serial communication system, human-computer interaction device, digital control circuit; Said digital control circuit is connected with serial communication system, human-computer interaction device respectively; Said serial communication system is used to realize communicating by letter between digital control circuit and the DC power supplier; Said human-computer interaction device is used to be provided with and show the output parameter of multimode parallel connection direct power supply; Said digital control circuit is controlled the output of each DC power supplier and is realized current-sharing according to the output parameter of all working DC power supplier in each control cycle and the output parameter of human-computer interaction device's setting; Said supervisory control system is connected with every DC power supplier.
Said DC power supplier comprises main power circuit, control circuit, serial communication interface unit; Said control circuit is connected with main power circuit, serial communication interface circuit respectively; Main power circuit comprises three phase rectifier filter circuit, high-frequency inverter circuit, the output rectifier and filter that connects in order, and three phase rectifier filter circuit input is connected with three phase mains, and the output rectifier and filter output is connected with load.
The serial communication system of said supervisory control system is made up of serial communication interface circuit and serial communication bus; The serial communication interface circuit of said supervisory control system is connected with the serial communication interface unit of each DC power supplier through serial communication bus.
Said output parameter comprise output current, output voltage, power output more than one.
The control command that the control circuit of said DC power supplier sends through serial communication interface unit acquisition serial communication bus is controlled the output of main power circuit.
As preferably, said digital control circuit adopts dsp processor.
The control method for parallel of above-mentioned multimode parallel connection direct power supply is following:
Said multimode parallel connection direct power supply comprises N platform DC power supplier, and i platform DC power supplier is used U
iExpression, 2≤i≤N, the voltage that each DC power supplier is corresponding is V
i, each DC power supplier current corresponding is I
iThe control computing cycle of each DC power supplier is T
c, the digital control circuit control cycle of supervisory control system is T
s, T
s=kT
c, multiple k is a positive integer;
When multimode parallel connection direct power work during in constant current mode; The control circuit of every DC power supplier passes to the serial communication interface circuit of supervisory control system with self output voltage, output current through serial communication bus in real time, and the digital control circuit of supervisory control system is at each control cycle T
sOutput current summation to each DC power supplier
, with itself and I
sOutput current I with human-computer interaction device's setting
mObtain the given electric current I of module through PID (Proportion Integration Differentiation) computing
g, i.e. every electric current that DC power supplier all should be exported, and pass to the serial communication interface unit of every DC power supplier through serial communication bus, the control circuit of every DC power supplier is controlled main power circuit by instruction output; The control circuit of DC power supplier is at one-period T
sIn, with T
cBe control computing cycle and the given electric current I of module
gFor output current is controlled main power circuit output;
When multimode parallel connection direct power work during, the output voltage V of multimode parallel connection direct power supply is set through the human-computer interaction device of supervisory control system in constant voltage mode
U, serial communication interface circuit sends it serial communication interface unit of every DC power supplier to through serial communication bus; The serial communication interface unit of every DC power supplier is delivered to the serial communication interface circuit of supervisory control system with self output voltage, output current through serial communication bus in real time, and digital control circuit is at each control cycle T
sOutput current I according to each DC power supplier
iSum is tried to achieve average current
, according to each DC power supplier voltage V
iSum is tried to achieve average voltage
, serial communication interface circuit sends to result of calculation through serial communication bus the serial communication interface unit of each DC power supplier; The control circuit of each DC power supplier calculates voltage deviation V separately
i=V
v-V
i, the control circuit of every DC power supplier is at one-period T
sIn will be with V
i+ V
iBe Voltage Feedback, with V
UCarry out the PID computing and obtain the given electric current I of module
gControl circuit is with the given electric current I of module
gOutput current I with each DC power supplier
iCarry out the PID computing, simultaneously with average current I
vOutput current I with each DC power supplier
iCarry out the PID computing, and the result of calculation of twice PID computing is controlled output through weighted mean method as PWM, taken into account the harmony of voltage output and each DC power supplier output current.
Compared with prior art, the present invention has following advantage and technique effect:
1, the present invention has well solved the constant voltage control model of multimode parallel connection direct power supply.
2, multimode parallel connection direct power supply adopts serial communication, and technology is simple, and connecting line is few, is convenient to production maintenance.
3, control method is simple and reliable, and multimode parallel connection direct power supply dynamic property improves greatly when constant voltage mode, can directly apply in the digitlization DC power supply parallel system.
Description of drawings
Fig. 1 is the multimode parallel connection direct power supply architecture block diagram in the execution mode.
Fig. 2 is the supervisory control system block diagram in the execution mode.
Fig. 3 is the DC power supplier structural representation in the execution mode.
Embodiment
Below in conjunction with specific embodiment the present invention is further specified.
Fig. 1 illustrates the multimode parallel connection direct power supply architecture block diagram in the execution mode, and this multimode parallel connection direct power supply comprises supervisory control system and N platform DC power supplier, N >=2; Said supervisory control system is connected with each DC power supplier; Be illustrated in figure 2 as the supervisory control system block diagram in the execution mode, said supervisory control system comprises serial communication system 101, human-computer interaction device 102, digital control circuit 103; Said serial communication circuit 101 comprises serial communication interface circuit and CAN bus, is used to transmit digital control processor and sends to the control command of each DC power supplier and the demand for control data that each DC power supplier sends to digital control processor; Said human-computer interaction device 102 comprises display and keyboard, is used to be provided with and show the output parameter of multimode parallel connection direct power supply; Said digital control circuit 103 comprises digital control processor and processor peripheral circuit; Through the output parameter of all working DC power supplier and the output parameter of human-computer interaction device's setting being done the control corresponding computing, make each DC power supplier export and realize current-sharing as required at each control cycle; Said digital control processor is connected with serial communication interface circuit, display, keyboard respectively.
As shown in Figure 3, be the DC power supplier structural representation in the execution mode, this DC power supplier comprises main power circuit 104, control circuit 105, serial communication interface unit 106; Said control circuit 105 is connected with main power circuit 104, serial communication interface unit 106 respectively; Main power circuit 104 comprises mains switch, three phase rectifier filter circuit, high-frequency inverter circuit, the output rectifier and filter that connects in order, and mains switch is connected with three phase mains, and the output rectifier and filter output is connected with load; It is core that said control circuit 105 adopts dsp processor, comprises output voltage and current feedback circuit, PWM output Drive Protecting Circuit, fault secure circuit, DSP peripheral circuit; The control command of the dsp processor of control circuit 105 106 supervisory control system digital control processors of obtaining to send from the serial communication interface unit through the CAN bus, and control the output of main power circuit 104 through PWM output Drive Protecting Circuit.
The serial communication interface circuit of said supervisory control system is connected with the serial communication interface unit of each DC power supplier through the CAN bus.
Said output parameter comprise following one of at least: output current, output voltage, power output.
As preferably, said digital control circuit adopts dsp processor.
The control method for parallel of above-mentioned multimode parallel connection direct power supply is following:
Said multimode parallel connection direct power supply comprises N platform DC power supplier, and i platform DC power supplier is used U
iExpression, 2≤i≤N, the voltage that each DC power supplier is corresponding is V
i, each DC power supplier current corresponding is I
iThe control computing cycle of each DC power supplier is T
c, the digital control circuit control cycle of supervisory control system is T
s, T
s=kT
c, multiple k is a positive integer;
When multimode parallel connection direct power work during in constant current mode; The control circuit of every DC power supplier passes to the serial communication interface circuit of supervisory control system with self output voltage, output current through serial communication bus in real time, and the digital control circuit of supervisory control system is at each control cycle T
sOutput current summation to each DC power supplier
, with itself and I
sOutput current I with human-computer interaction device's setting
mObtain the given electric current I of module through the PID computing
g, i.e. every electric current that DC power supplier all should be exported, and pass to the serial communication interface unit of every DC power supplier through serial communication bus, the control circuit of every DC power supplier is controlled main power circuit by instruction output; The control circuit of DC power supplier is at one-period T
sIn, with T
cBe control computing cycle and the given electric current I of module
gFor output current is controlled main power circuit output;
When multimode parallel connection direct power work during, the output voltage V of multimode parallel connection direct power supply is set through the human-computer interaction device of supervisory control system in constant voltage mode
U, serial communication interface circuit sends it serial communication interface unit of every DC power supplier to through serial communication bus; The serial communication interface unit of every DC power supplier is delivered to the serial communication interface circuit of supervisory control system with self output voltage, output current through serial communication bus in real time, and digital control circuit is at each control cycle T
sOutput current I according to each DC power supplier
iSum is tried to achieve average current
, according to each DC power supplier voltage V
iSum is tried to achieve average voltage
, serial communication interface circuit sends to result of calculation through serial communication bus the serial communication interface unit of each DC power supplier; The control circuit of each DC power supplier calculates voltage deviation V separately
i=V
v-V
i, the control circuit of every DC power supplier is at one-period T
sIn will be with V
i+ V
iBe Voltage Feedback, with V
UCarry out the PID computing and obtain the given electric current I of module
gControl circuit is with the given electric current I of module
gOutput current I with each DC power supplier
iCarry out the PID computing, simultaneously with average current I
vOutput current I with each DC power supplier
iCarry out the PID computing, and the result of calculation of twice PID computing is controlled output through weighted mean method as PWM, taken into account the harmony of voltage output and each DC power supplier output current.
Multimode parallel connection direct power supply provided by the present invention and the constant voltage control model that control method is simple in structure, wiring less, has well solved parallel system thereof, dynamic performance is good.
Specific embodiment described herein only is specifying spirit of the present invention; Those skilled in the art can make various modifications to this specific embodiment or replenish and perhaps adopt similar mode to substitute under the prerequisite of principle of the present invention and essence, but these changes all fall into protection scope of the present invention.Therefore technical scope of the present invention is not limited to the foregoing description.
Claims (5)
1. multimode parallel connection direct power supply is characterized in that comprising supervisory control system and N platform DC power supplier, N >=2; Said supervisory control system comprises serial communication system, human-computer interaction device, digital control circuit; Said digital control circuit is connected with serial communication system, human-computer interaction device respectively; Said serial communication system is used to realize communicating by letter between digital control circuit and the DC power supplier; Said human-computer interaction device is used to be provided with and show the output parameter of multimode parallel connection direct power supply; Said digital control circuit is controlled the output of each DC power supplier and is realized current-sharing according to the output parameter of all working DC power supplier in each control cycle and the output parameter of human-computer interaction device's setting; Said supervisory control system is connected with every DC power supplier.
2. multimode parallel connection direct power supply according to claim 1 is characterized in that said DC power supplier comprises main power circuit, control circuit and serial communication interface unit; Said control circuit is connected with main power circuit, serial communication interface circuit respectively; Main power circuit comprises three phase rectifier filter circuit, high-frequency inverter circuit, the output rectifier and filter that connects in order, and three phase rectifier filter circuit input is connected with three phase mains, and the output rectifier and filter output is connected with load.
3. multimode parallel connection direct power supply according to claim 2 is characterized in that the serial communication system of said supervisory control system is made up of serial communication interface circuit and serial communication bus; The serial communication interface circuit of said supervisory control system is connected with the serial communication interface unit of each DC power supplier through serial communication bus; The control command that the control circuit of said DC power supplier sends through serial communication interface unit acquisition serial communication bus is controlled the output of main power circuit.
4. multimode parallel connection direct power supply according to claim 1 is characterized in that output parameter comprises more than one in output current, output voltage, the power output.
5. the control method of each said multimode parallel connection direct power supply of claim 1-4 is characterized in that, said multimode parallel connection direct power supply comprises N platform DC power supplier, and i platform DC power supplier is used U
iExpression, 2≤i≤N, the voltage that each DC power supplier is corresponding is V
i, each DC power supplier current corresponding is I
iThe control computing cycle of each DC power supplier is T
c, the digital control circuit control cycle of supervisory control system is T
s, T
s=kT
c, multiple k is a positive integer;
When multimode parallel connection direct power work during in constant current mode; The control circuit of every DC power supplier passes to the serial communication interface circuit of supervisory control system with self output voltage, output current through serial communication bus in real time, and the digital control circuit of supervisory control system is at each control cycle T
sOutput current summation to each DC power supplier
, with itself and I
sOutput current I with human-computer interaction device's setting
mObtain the given electric current I of module through the PID computing
g, i.e. every electric current that DC power supplier all should be exported, and pass to the serial communication interface unit of every DC power supplier through serial communication bus, the control circuit of every DC power supplier is controlled main power circuit by instruction output; The control circuit of DC power supplier is at one-period T
sIn, with T
cBe control computing cycle and the given electric current I of module
gFor output current is controlled main power circuit output;
When multimode parallel connection direct power work during, the output voltage V of multimode parallel connection direct power supply is set through the human-computer interaction device of supervisory control system in constant voltage mode
U, serial communication interface circuit sends it serial communication interface unit of every DC power supplier to through serial communication bus; The serial communication interface unit of every DC power supplier is delivered to the serial communication interface circuit of supervisory control system with self output voltage, output current through serial communication bus in real time, and digital control circuit is at each control cycle T
sOutput current I according to each DC power supplier
iSum is tried to achieve average current
, according to each DC power supplier voltage V
iSum is tried to achieve average voltage
, serial communication interface circuit sends to result of calculation through serial communication bus the serial communication interface unit of each DC power supplier; The control circuit of each DC power supplier calculates voltage deviation V separately
i=V
v-V
i, the control circuit of every DC power supplier is at one-period T
sIn will be with V
i+ V
iBe Voltage Feedback, with V
UCarry out the PID computing and obtain the given electric current I of module
gControl circuit is with the given electric current I of module
gOutput current I with each DC power supplier
iCarry out the PID computing, simultaneously with average current I
vOutput current I with each DC power supplier
iCarry out the PID computing, and the result of calculation of twice PID computing is controlled output through weighted mean method as PWM.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946124A (en) * | 2012-10-25 | 2013-02-27 | 黑龙江大学 | Distributed power supply management device |
| CN103631177A (en) * | 2013-09-16 | 2014-03-12 | 华南理工大学 | Direct-current power supply asynchronous parallel digital control system and control method thereof |
| CN103812311A (en) * | 2014-03-13 | 2014-05-21 | 刘晓霖 | Parallel rapid control system based on double communication ports for switching power supply |
| CN103956729A (en) * | 2014-04-04 | 2014-07-30 | 华南理工大学 | Electrochemical direct-current power source same-frequency out-phase parallel control system and control method thereof |
| CN103984306A (en) * | 2014-05-08 | 2014-08-13 | 大连英微电气有限公司 | Double-communication-port power module and communication system for power module |
| CN104467368A (en) * | 2013-09-25 | 2015-03-25 | 比亚迪股份有限公司 | Current sharing method of voltage sources and power system |
| CN104699154A (en) * | 2015-02-13 | 2015-06-10 | 四川中测电子科技有限公司 | Adjustable power supply and average-current system with same |
| CN105633943A (en) * | 2016-04-01 | 2016-06-01 | 上海圣速电子科技股份有限公司 | Block-building switch power supply system |
| CN106712463A (en) * | 2017-01-05 | 2017-05-24 | 郑州云海信息技术有限公司 | Current equalizing device, method and system |
| CN106862738A (en) * | 2017-03-24 | 2017-06-20 | 华南理工大学 | A kind of thick strip robot plasma diced system and cutting method based on MFC |
| CN109672357A (en) * | 2018-12-14 | 2019-04-23 | 苏州诺威特测控科技有限公司 | A kind of bearing calibration of the more power module parallel current imbalances of single crystal growing furnace power supply |
| CN113162023A (en) * | 2021-03-22 | 2021-07-23 | 深圳市未蓝新能源科技有限公司 | Current balance control method of multi-direct-current branch bidirectional inverter and bidirectional inverter |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946124A (en) * | 2012-10-25 | 2013-02-27 | 黑龙江大学 | Distributed power supply management device |
| CN103631177A (en) * | 2013-09-16 | 2014-03-12 | 华南理工大学 | Direct-current power supply asynchronous parallel digital control system and control method thereof |
| CN104467368B (en) * | 2013-09-25 | 2017-10-31 | 比亚迪股份有限公司 | The current equalizing method and power-supply system of a kind of voltage source |
| CN104467368A (en) * | 2013-09-25 | 2015-03-25 | 比亚迪股份有限公司 | Current sharing method of voltage sources and power system |
| CN103812311B (en) * | 2014-03-13 | 2016-09-21 | 刘晓霖 | Switch power parallel fast acting control system based on duplex mouth |
| CN103812311A (en) * | 2014-03-13 | 2014-05-21 | 刘晓霖 | Parallel rapid control system based on double communication ports for switching power supply |
| CN103956729B (en) * | 2014-04-04 | 2016-10-05 | 华南理工大学 | A kind of electrochemistry DC source is with frequency out-phase parallel control system and control method thereof |
| CN103956729A (en) * | 2014-04-04 | 2014-07-30 | 华南理工大学 | Electrochemical direct-current power source same-frequency out-phase parallel control system and control method thereof |
| CN103984306B (en) * | 2014-05-08 | 2016-07-06 | 大连英微电气有限公司 | A kind of communication system for power module |
| CN103984306A (en) * | 2014-05-08 | 2014-08-13 | 大连英微电气有限公司 | Double-communication-port power module and communication system for power module |
| CN104699154A (en) * | 2015-02-13 | 2015-06-10 | 四川中测电子科技有限公司 | Adjustable power supply and average-current system with same |
| CN104699154B (en) * | 2015-02-13 | 2017-01-11 | 四川中测电子科技有限公司 | Adjustable power supply and average-current system with same |
| CN105633943B (en) * | 2016-04-01 | 2019-05-24 | 上海圣速电子科技股份有限公司 | Building block system switch power supply system |
| CN105633943A (en) * | 2016-04-01 | 2016-06-01 | 上海圣速电子科技股份有限公司 | Block-building switch power supply system |
| CN106712463A (en) * | 2017-01-05 | 2017-05-24 | 郑州云海信息技术有限公司 | Current equalizing device, method and system |
| WO2018126640A1 (en) * | 2017-01-05 | 2018-07-12 | 郑州云海信息技术有限公司 | Current equalizing device, method and system |
| CN106862738A (en) * | 2017-03-24 | 2017-06-20 | 华南理工大学 | A kind of thick strip robot plasma diced system and cutting method based on MFC |
| CN109672357A (en) * | 2018-12-14 | 2019-04-23 | 苏州诺威特测控科技有限公司 | A kind of bearing calibration of the more power module parallel current imbalances of single crystal growing furnace power supply |
| CN113162023A (en) * | 2021-03-22 | 2021-07-23 | 深圳市未蓝新能源科技有限公司 | Current balance control method of multi-direct-current branch bidirectional inverter and bidirectional inverter |
| CN113162023B (en) * | 2021-03-22 | 2024-05-14 | 深圳市未蓝新能源科技有限公司 | Current balance control method of multi-DC branch bidirectional inverter and bidirectional inverter |
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| CN102646979B (en) | 2014-07-30 |
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