CN100414807C - Current-sharing control method and system for parallel modular inverse power supply - Google Patents
Current-sharing control method and system for parallel modular inverse power supply Download PDFInfo
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- CN100414807C CN100414807C CNB200510032806XA CN200510032806A CN100414807C CN 100414807 C CN100414807 C CN 100414807C CN B200510032806X A CNB200510032806X A CN B200510032806XA CN 200510032806 A CN200510032806 A CN 200510032806A CN 100414807 C CN100414807 C CN 100414807C
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Abstract
The present invention discloses a current-sharing control method and a system for a parallel modular inverse power supply. The current-sharing control method comprises the following steps: output values of at least two Inverter modules are mutually compared, the maximum value of the output values is used as a current-sharing signal to be input into other inverter modules via current-sharing buses for controlling output values of other inverter modules; a control system is used for detecting an output signal of a voltage control circuit of a DC/DC part in each inverter module; the output signals are treated by a CPU circuit, control signals are fed back into the DC/AC part of each inverter module via a cascade control bus for controlling the output of each inverter module. The system comprises at least two parallel connection load inverter modules and the control system, wherein the control system controls a sine modulation signal generator to output sine modulation signals to the inverter modules by the cascade control buses for adjusting the output of the inverter modules. The wire connection of the system is simplified, and the stability of the system is enhanced.
Description
[technical field]
The present invention relates to electric and electronic technical field, relate in particular to current balance control method and system between each module of parallel modular inverse power supply system.
[background technology]
Along with the development of power electronic technology, various electronic installations are more and more higher to the requirement of power, and are also increasing to the requirement of electric current, adopt a plurality of power module parallel operations, not only can provide required electric current, but also can form the N+X redundancy structure, improve the stability of system.But, when the power module parallel running,, causing some module overload because the dispersiveness of each module parameter makes the electric current of its output impossible just the same, some module load kicks the beam, and this will make the stability of system reduce.Making the output current mean allocation of each parallel electric source module, is a problem that must solve that improves parallel power supply system stability.
Existing parallel modular inverse power supply current-sharing control method mainly contains two kinds: principal and subordinate's power supply method and automatic current equalizing method.
Fig. 1 is the circuit theory diagrams of principal and subordinate's power supply method, principal and subordinate's power supply method be with one in a plurality of power modules of parallel connection as primary module, other modules are followed primary module work.The concrete course of work is: the operating current and the output feedback signal of primary module compare, and difference signal is fed back to the control circuit of each power module (comprise primary module and from module), thereby regulate the output current size of each module.If module 1 is a primary module, the sampled voltage of its output current is V1, and the sampled voltage of other module output currents is Vn.When a certain module output current was bigger than normal, corresponding Vn increased, and compared with V1, and the Ven that obtains reduces, and feeds back in the control circuit of this module, reduces its output current, thereby realized current-sharing.The shortcoming of its existence is: each intermodule needs writes to each other, the line more complicated; In case primary module breaks down, then whole power-supply system will be collapsed, and can not be used for redundancy structure.
Fig. 2 is the circuit theory diagrams of automatic current equalizing method, and automatic current equalizing method also is the single line method, and its operation principle is that each power module is all received on the current equalizing bus bar by a current sensor and a sampling resistor.When output reached current-sharing, output current I1 was zero.Otherwise, then on the resistance R owing to there is electric current I 1 to flow through, produce a voltage U ab at its two ends, this voltage is through amplifier A output voltage U c, and it and the reference voltage Ur Δ U after relatively feeds back to the control section of power module, thereby the adjusting output current is finally realized current-sharing.The shortcoming of its existence is: must adopt current equalizing bus bar, if a module and current-sharing bus short circuit are arranged, then system just can't current-sharing, and the individual module current limliting also may cause system's instability.
[summary of the invention]
The technical problem to be solved in the present invention provides a kind of parallel modular inverse power supply current-sharing control method and system, overcome a primary module must have been arranged in the active and slave current method, in case primary module breaks down, then whole power-supply system will be collapsed, also overcome and needed a current equalizing bus bar in the automatic current equalizing method, in case sampling resistor damages, system just can't operate as normal.
The present invention realizes by following technical scheme:
A kind of parallel modular inverse power supply current-sharing control method, be used for the inverter that at least two inverter modules parallel with one another are formed, it is characterized in that may further comprise the steps: compare mutually between the detection signal of the current output value of at least two inverter modules, the maximum of getting in the output valve is input in other each inverter modules by the current-sharing bus as the current-sharing signal, to control the alternating voltage output valve of other each inverter modules; Control system will be from the voltage in each inverter module, electric current, frequency and fault-signal, after the processing through cpu circuit in the control system, by cascade control bus feedback control signal in each inverter module DC/AC circuit, to control the output of each inverter module.
Be input to the current-sharing signal of a certain inverter module and the output valve of this inverter module and compare, its difference is controlled the alternating voltage output valve of this inverter module through amplifying in the described voltage control circuit of back input by voltage control circuit.
The output signal of described voltage control circuit comprises voltage, electric current, frequency and fault-signal.
The control signal that control system is fed back is the sinusoidal pulse width modulation signal that described cpu circuit control sinusoidal pulse width modulation signal generator is produced.
A kind of parallel modular inverse power supply sharing control system comprises: by current-sharing bus two inverter modules parallel with one another at least; A control system, comprise cpu circuit and sinusoidal pulse width modulation signal SPWM generator, described control system detects the working state signal of described inverter module, through after the processing of cpu circuit, control sinusoidal pulse width modulation signal SPWM generator is exported to inverter module to sinusoidal pulse width modulation signal SPWM by the cascade control bus, to regulate the output of inverter module.
Described inverter module comprises the DC/DC translation circuit, the DC/AC inverter circuit, PWM modulation circuit and voltage control circuit, the signal input DC/AC inverter circuit that described DC/DC translation circuit is exported, the output of DC/DC translation circuit by first feedback loop signal feedback in described voltage control circuit, in described voltage control circuit, described voltage control circuit is regulated the output of described DC/DC translation circuit to the series arm of the output of DC/AC inverter circuit by second feedback loop and voltage setting circuit by the PWM modulation circuit signal feedback.
Described voltage setting circuit comprises first diode and operational amplifier, described second computing circuit links to each other with the anode of described first diode and the input in the same way of operational amplifier, the negative electrode of first diode is connected to the reverse input end of described current-sharing bus and operational amplifier, and the output of operational amplifier connects described voltage control circuit.
Described inverter module also comprises an accessory power supply to the voltage control circuit power supply, and described voltage control circuit control accessory power supply gives the input of PWM modulation circuit a PWM reference voltage.
Described second feedback loop is the series arm of the second current feedback circuit and second computing circuit.
Described sinusoidal pulse width modulation signal is input in the DC/AC inverter circuit in the inverter module.
Owing to adopted above-mentioned technical scheme, inverter module inside to be provided with to detect the testing circuit of self load output current, simplified the wiring of system; Each inverter module is by adjusting the purpose that direct voltage reaches current-sharing, in the design of circuit with implement more simple and reliable; The module of just having devoted oneself to work in the system finishes the current-sharing of each inverter module by the control signal of receiving control system feedback at short notice, has improved the stability of a system.
[description of drawings]
Fig. 1 is the circuit theory diagrams of principal and subordinate's power supply method in the prior art.
Fig. 2 is the circuit theory diagrams of automatic current equalizing method in the prior art.
Fig. 3 is a system block diagram of the present invention.
Fig. 4 is the internal frame diagram of inverter module.
[embodiment]
As shown in Figure 3, a kind of parallel modular inverse power supply sharing control system comprises:
The inverter module of at least two loads that are connected in parallel, each inverter module interconnects by the current-sharing bus; Described inverter module comprises DC/DC translation circuit, DC/AC inverter circuit, PWM modulation circuit and voltage control circuit, the signal input DC/AC inverter circuit that described DC/DC translation circuit is exported, the output termination load of DC/AC inverter circuit; The output of DC/DC translation circuit by first feedback loop signal feedback in described voltage control circuit, described first feedback loop is the series arm of voltage feedback circuit or the first current feedback circuit and first computing circuit.In described voltage control circuit, described second feedback loop is the series arm of the second current feedback circuit and second computing circuit to the series arm of the output of DC/AC inverter circuit by second feedback loop and voltage setting circuit signal feedback.Described voltage control circuit is regulated the output of described DC/DC translation circuit by the PWM modulation circuit.The current-sharing signal value of being imported compares with the value of feedback of second feedback loop in voltage setting circuit, if value of feedback is greater than the current-sharing signal value of being imported, then this inverter module keeps original operating state, and this value of feedback overrides original current-sharing signal value, and become the current current-sharing signal value of whole parallel modular inverse power supply sharing control system, be input to by the current-sharing bus in other the inverter module; If value of feedback is less than the current-sharing signal value of being imported, then the difference between them is input in the described voltage control circuit after amplifying, voltage control circuit is correspondingly controlled the output that the PWM modulation circuit is regulated described DC/DC translation circuit, make the value of feedback of DC/AC inverter circuit output equate at last, thereby make each inverter module output voltage amplitude unanimity in the whole system with the current-sharing signal value.
A control system, comprise cpu circuit and Sine Pulse Width Modulation signal generator, described control system detects the voltage magnitude and the electric voltage frequency of described voltage control circuit output, processing through cpu circuit, control described Sine Pulse Width Modulation signal generator and feed back the Sine Pulse Width Modulation signal to the DC/AC inverter circuit in the inverter module by the cascade control bus, to regulate the output voltage phase place of DC/AC inversion, make the phase place unanimity of each inverter module output voltage in the whole system.
Described inverter module also comprises an accessory power supply to the voltage control circuit power supply, and described voltage control circuit control accessory power supply gives the input of PWM modulation circuit a PWM reference voltage.
As shown in Figure 4, described voltage setting circuit comprises the first diode D1 and operational amplifier A 1, described second computing circuit links to each other with the anode of the described first diode D1 and the input in the same way of operational amplifier A 1, the negative electrode of the first diode D1 is connected to the reverse input end of described current-sharing bus and operational amplifier A 1, and the output of operational amplifier A 1 connects described voltage control circuit.Vc is the current-sharing signal on the current-sharing bus, Vi is the feedback of DC/AC inverter circuit output, as Vi during greater than Vc, the first diode D1 conducting, Vi is input to the reverse input end of operational amplifier A 1 and input in the same way simultaneously, and then to be input to the value of feedback of voltage control circuit be zero to voltage setting circuit, and then the output of this inverter module keeps original state, Vi covers Vc simultaneously, as the current-sharing signal of each inverter module of whole system; As Vi during less than Vc, the first not conducting of diode D1, then Vc is as the input of operational amplifier A 1 reverse input end, the difference of Vc and Vi is input in the voltage control circuit after amplifying through operational amplifier A 1, voltage control circuit is correspondingly controlled the output that the PWM modulation circuit is regulated described DC/DC translation circuit, make the value of feedback of DC/AC inverter circuit output equate at last, thereby make each inverter module output voltage amplitude unanimity in the whole system with the current-sharing signal value.
Claims (10)
1. a parallel modular inverse power supply current-sharing control method is used for the inverter that at least two inverter modules parallel with one another are formed, and it is characterized in that may further comprise the steps:
Compare mutually between the current output value of a, at least two inverter modules, the maximum of getting in the output valve is input in other each inverter modules by the current-sharing bus as the current-sharing signal, to control the alternating voltage output valve of other each inverter modules;
B, control system will be from the voltage in each inverter module, electric current, frequency and fault-signal, after the processing through cpu circuit in the control system, by cascade control bus feedback control signal in each inverter module DC/AC circuit, to control the output of each inverter module.
2. a kind of parallel modular inverse power supply current-sharing control method according to claim 1, it is characterized in that: the detection signal that is input to the inverter current output valve of the current-sharing signal of a certain inverter module and this inverter module compares, its higher value is controlled the alternating voltage output valve of this inverter module through in the voltage control circuit that amplifies back input inverter module by voltage control circuit.
3. a kind of parallel modular inverse power supply current-sharing control method according to claim 1, it is characterized in that: the output signal of the voltage control circuit of described inverter module comprises voltage, electric current, frequency and fault-signal.
4. a kind of parallel modular inverse power supply current-sharing control method according to claim 1 is characterized in that: the control signal that control system is fed back is the sinusoidal pulse width modulation signal SPWM that described cpu circuit control sinusoidal pulse width modulation signal SPWM generator is produced.
5. parallel modular inverse power supply sharing control system comprises:
By current-sharing bus at least two inverter modules parallel with one another;
A control system, comprise cpu circuit and sinusoidal pulse width modulation signal SPWM generator, described control system detects the working state signal of described inverter module, through after the processing of cpu circuit, control sinusoidal pulse width modulation signal SPWM generator is exported to inverter module to sinusoidal pulse width modulation signal SPWM by the cascade control bus, to regulate the output of inverter module.
6. a kind of parallel modular inverse power supply sharing control according to claim 5 system, it is characterized in that: described inverter module comprises the DC/DC translation circuit, the DC/AC inverter circuit, PWM modulation circuit and voltage control circuit, the signal input DC/AC inverter circuit that described DC/DC translation circuit is exported, the output of DC/DC translation circuit by first feedback loop signal feedback in described voltage control circuit, in described voltage control circuit, described voltage control circuit is regulated the output of described DC/DC translation circuit to the series arm of the output of DC/AC inverter circuit by second feedback loop and voltage setting circuit by the PWM modulation circuit signal feedback.
7. a kind of parallel modular inverse power supply sharing control according to claim 6 system, it is characterized in that: described voltage setting circuit comprises first diode (D1) and operational amplifier (A1), and described second feedback loop comprises the second current feedback circuit and second computing circuit; Described second computing circuit links to each other with the anode of described first diode (D1) and the input in the same way of operational amplifier (A1), the negative electrode of first diode (D1) is connected to the reverse input end of described current-sharing bus and operational amplifier (A1), and the output of operational amplifier (A1) connects described voltage control circuit.
8. a kind of parallel modular inverse power supply sharing control according to claim 6 system, it is characterized in that: described inverter module also comprises an accessory power supply to the voltage control circuit power supply, and described voltage control circuit control accessory power supply gives the input of PWM modulation circuit a PWM reference voltage.
9. a kind of parallel modular inverse power supply sharing control according to claim 6 system, it is characterized in that: described second feedback loop is the series arm of the second current feedback circuit and second computing circuit.
10. a kind of parallel modular inverse power supply sharing control according to claim 6 system is characterized in that: described sinusoidal pulse width modulation signal SPWM is input in the DC/AC inverter circuit in the inverter module.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200510032806XA CN100414807C (en) | 2005-01-21 | 2005-01-21 | Current-sharing control method and system for parallel modular inverse power supply |
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| CNB200510032806XA CN100414807C (en) | 2005-01-21 | 2005-01-21 | Current-sharing control method and system for parallel modular inverse power supply |
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| CN1808829A CN1808829A (en) | 2006-07-26 |
| CN100414807C true CN100414807C (en) | 2008-08-27 |
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| CN101202453B (en) * | 2006-12-15 | 2010-09-01 | 中兴通讯股份有限公司 | Method and system for controlling single-phase semi-bridge inversion parallel connection direct current circulating current |
| CN100461607C (en) * | 2007-04-05 | 2009-02-11 | 南京航空航天大学 | Parallel-working sine ware inverter |
| CN102005903B (en) * | 2009-08-28 | 2013-01-16 | 华为技术有限公司 | Digital current equalizing method of power source module, power source module and communication equipment |
| JP2011072167A (en) * | 2009-09-28 | 2011-04-07 | Tdk-Lambda Corp | Controller, control method, and program |
| CN101694971B (en) * | 2009-10-23 | 2013-03-20 | 中国科学院空间科学与应用研究中心 | Circuit for transforming direct current input power to alternating current output power |
| CN102638045B (en) * | 2011-02-12 | 2014-11-19 | 中国人民解放军总后勤部建筑工程研究所 | Modular parallel inverting system with loading self-adapting function and control method thereof |
| CN102231608B (en) * | 2011-07-04 | 2013-08-07 | 浙江大学 | DC (direct current) loop-current suspension device for inverter parallel system |
| CN102858064A (en) * | 2012-08-29 | 2013-01-02 | 茂硕电源科技股份有限公司 | LED (light emitting diode) centralized drive power parallel system |
| CN102832643A (en) * | 2012-09-19 | 2012-12-19 | 中船重工鹏力（南京）新能源科技有限公司 | Control method of three-phase photovoltaic grid-tied inverter based on inverse system |
| CN105048503B (en) * | 2015-08-12 | 2017-08-11 | 中国科学院电工研究所 | The control method of parallel power generating system |
| CN110190768B (en) * | 2018-02-22 | 2020-12-08 | 固纬电子实业股份有限公司 | DC-AC converter and parallel current-sharing control method thereof |
| CN109586589B (en) * | 2018-11-19 | 2020-07-21 | 许继集团有限公司 | MMC and submodule investment number calculation method, investment method and device |
| CN111077469B (en) * | 2019-11-27 | 2023-02-10 | 上海辛格林纳新时达电机有限公司 | Power supply monitoring system |
| CN113054758B (en) * | 2021-03-16 | 2023-03-14 | 中国人民解放军海军工程大学 | Multi-channel wireless power transmission system for realizing power self-balancing |
| CN113472020B (en) * | 2021-06-29 | 2024-04-16 | 国网江苏省电力有限公司电力科学研究院 | Novel AC/DC hybrid data center power supply control system and control method |
| CN118137870A (en) * | 2024-05-08 | 2024-06-04 | 广东高斯宝电气技术有限公司 | Parallel operation current sharing control method based on unidirectional inverter |
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Assignee: Shenzhen New Future Electric Power Technology Co., Ltd. Assignor: Guangxi New Future Information Industry Co., Ltd. Contract fulfillment period: 2009.6.5 to 2019.6.4 contract change Contract record no.: 2009990000675 Denomination of invention: Current-sharing control method and system for parallel modular inverse power supply Granted publication date: 20080827 License type: Exclusive license Record date: 2009.6.17 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.6.5 TO 2019.6.4; CHANGE OF CONTRACT Name of requester: SHENZHEN NEW FUTURE POWER SUPPLY TECHNOLOGY CO.,LT Effective date: 20090617 |
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