CN103515979A - Low-cost single-phase integrated energy feedback system - Google Patents
Low-cost single-phase integrated energy feedback system Download PDFInfo
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- CN103515979A CN103515979A CN201310090037.3A CN201310090037A CN103515979A CN 103515979 A CN103515979 A CN 103515979A CN 201310090037 A CN201310090037 A CN 201310090037A CN 103515979 A CN103515979 A CN 103515979A
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Abstract
The invention discloses a single-phase integrated energy feedback system. The single-phase integrated energy feedback system comprises a filter, a power grid voltage sampling circuit, an input current sensor, capacitor sets connected in parallel, a bus voltage sampling circuit, a control circuit board, a three-phase output inverter and an output current sensor, and further comprises a single-phase full-bridge circuit, and midpoints of two bridge arms of the single-phase full-bridge circuit are connected with an L wire and an N wire of a single-phase power grid through the filter. A control circuit samples bus voltage, the voltage of the power grid, an input current and an output current of the three-phase inverter. When the bus voltage is lower than the set value, a single-phase rectification bridge is formed by a reverse parallel diode of the single-phase full-bridge circuit to carry out non-control rectification on the power grid voltage, and the system is in a rectification power utilization state. When the bus voltage is higher than the set value, the single-phase full-bridge circuit serves as a full-bridge inverter to convert electric energy fed back to a bus into a single-phase alternating current, and the single-phase alternating current is input to the power grid. The integration between rectification and inversion is achieved, and the single-phase integral energy feedback system has the advantages of being simple and compact in circuit structure, easy to control, low in device cost and the like.
Description
Technical field
The present invention relates to a kind of energy feedback system, particularly use the integrated power electronic system of commutation inversion of single phase power supply.
Background technology
In the occasion of the quick start-stop of some motors, frequent rotating, when motor braking and the decline of drive potential energy loading high, motor is in generating state.Can make frequency converter busbar voltage increase to the frequency converter bus Injection Current of motor, this pump up voltage reaches certain numerical value, will puncture the operation element of frequency converter.
Too high in order to prevent frequency converter bus pump up voltage, conventionally adopt the method in frequency changer direct current bus energy consumption in parallel unit, the electric energy receiving on DC bus is discharged in hot mode by energy consumption resistance.The energy consumption unit of this solution need to take compare great space, and has wasted the electric weight that motor sends.
For the electric energy that can utilize electric power generation to produce, by the way at frequency converter bus energy back feed device in parallel, can realize feedback energy is converted to alternating current sends into electrical network.The Chinese patent literature that for example publication number is CN101692581A discloses a kind of " single-phase high-frequency energy feedback device cheaply ", and still, this scheme has the following disadvantages:
(1), for motor, rectification and feedback are two devices, system complex, and device volume is large, and components and parts are many, and cost is higher;
(2) during practical application, often exist feedback device and frequency converter not to mate, feedback device disturbs frequency converter, causes frequency converter cisco unity malfunction and situation that cannot practical application.
For rectification and feedback being integrated in a kind of circuit, the Chinese patent literature that grant number is CN201985778U has been announced " a kind of topological circuit of energy feedback all-in-one machine frequency converter and control system ", but this system has following shortcoming:
(1) input need to detect three phase network voltage and current, needs more transducer and testing circuit;
(2) have 6 switching tube demand motives, drive circuit is more;
(3) the feedback control algolithm of three-phase circuit is complicated, and software development cost is large, and needs the control chip of high performance costliness;
These shortcomings cause system cost still higher.
Summary of the invention
The present invention be directed to the shortcoming of above prior art, the occasion not high at some performance requirements, cost requirement reduces, provides a kind of and can realize commutation supply voltage and the generating integrated single-phase energy feedback system of feedback inversion transformation, realize energy-conserving and environment-protective, the object of cost.
A kind of single-phase integrated energy feedback system cheaply, be applied to use the power electronic system of single-phase mains supply, the capacitance group, busbar voltage sample circuit, control circuit board, three-phase output inverter and the output current transducer that comprise filter, line voltage sample circuit, input current transducer, parallel connection, also comprise a single-phase full bridge circuit, the mid point of two brachium pontis of described single-phase full bridge circuit connects L line and the N line of single-phase electrical network by filter, two ends of brachium pontis are received on DC bus.
Described single-phase full bridge circuit consists of Q1, Q2, Q3, Q4.
Described busbar voltage sample circuit and line voltage sample circuit, sampling DC bus-bar voltage and line voltage, sampled signal is sent into control circuit board.
The capacitance group of described parallel connection is also connected between positive and negative DC bus.
Described filter is comprised of inductance and electric capacity.
Described control circuit sampling busbar voltage, line voltage, input current and three-phase inverter output current, according to the mode of operation of the sampled value decision systems of busbar voltage, and according to the feedback signal of described line voltage sample circuit, input current transducer, busbar voltage sample circuit, three-phase inverter output current transducer and motor encoder, export respectively PWM and drive signal, control conducting and the shutoff of the switching tube of single-phase full bridge circuit and three-phase inverter.
Described single-phase full bridge circuit can be operated in following two kinds of patterns: busbar voltage is during lower than set point, and the anti-and diode of single-phase full bridge circuit forms a single-phase rectification bridge, and line voltage is not controlled to rectification, and system work is at rectification electricity condition; Busbar voltage is during higher than set point, the voltage and current signal being obtained according to detection by control circuit carries out closed loop feedback control, drive opening and turn-offing of four switching tubes of single-phase full bridge circuit, with single-phase full-bridge inverter pattern, the electric energy feeding back on bus is converted to and electrical network same frequency and synchronous sinusoidal ac input single-phase electrical network.
Described single-phase integrated energy feedback system is when feedback is generated electricity, line voltage sample circuit is converted to a square-wave signal with electrical network same frequency and same phase single-phase power network signal, in software program, use digital phase-locked loop to follow the tracks of square-wave signal, the phase place of assurance current reference signal and frequency and electrical network are consistent, the size of amplitude is controlled automatically by DC Bus voltage compensatory loop, to electrical network, sends into same frequency and synchronous sinusoidal ac.
The current sensor of described three-phase inverter outlet side and motor encoder are respectively Electric Machine Control current feedback signal and feedback speed signal are provided.
The control method that the invention provides a kind of energy feedback integral system circuit structure of new use single phase power supply and adapt to it.
Compare with existing single phase power supply energy feedback scheme, advantage of the present invention is: commutation supply voltage circuit, feedback inversion transformation electricity generate function are integrated in a circuit, have realized commutation inversion integrated, reduced hardware complexity, reduce system cost, improved reliability.
Compare with the integrated energy feedback scheme of existing three phase supply, advantage of the present invention is: the number of sensors and the testing circuit number that have reduced line voltage and input current; Because switching tube quantity reduces to have reduced drive circuit; Single phase circuit feedback control algolithm is simple, has reduced the cost of software development work; Control algolithm is simple, and the requirement of controller main control chip is reduced, and facilitates control chip price to reduce.Therefore, realized integrated energy feedback system cheaply.
Accompanying drawing explanation
Fig. 1 is first embodiment of the present invention circuit theory diagrams.
Fig. 2 is second embodiment of the present invention circuit theory diagrams.
Fig. 3 is third embodiment of the present invention circuit theory diagrams.
Embodiment
A kind of single-phase integrated energy feedback system provided by the invention, can make the cost of existing energy feedback system obtain larger reduction, below in conjunction with accompanying drawing, enforcement of the present invention is described further.
With reference to figure 1, native system comprises the current sensor of capacitance group, busbar voltage sample circuit, control circuit board, three-phase output inverter and the three-phase output inverter of filter, line voltage sample circuit, input current transducer, parallel connection, also comprise a single-phase full bridge circuit being formed by Q1, Q2, Q3, Q4, the mid point of two brachium pontis of described single-phase full bridge circuit connects L line and the N line of single-phase electrical network by filter, two ends of brachium pontis are received on DC bus.
Described busbar voltage sample circuit and line voltage sample circuit, sampling DC bus-bar voltage and line voltage, sampled signal is sent into control circuit board.
Described capacitance group in parallel is also connected between positive and negative busbar.
Described filter is comprised of inductance and electric capacity.
Described control circuit sampling busbar voltage, line voltage, input current and three-phase inverter output current, according to the mode of operation of the sampled value decision systems of busbar voltage, and according to the feedback signal of described line voltage sample circuit, input current transducer, busbar voltage sample circuit, three-phase inverter output current transducer and motor encoder, export respectively PWM and drive signal, control conducting and the shutoff of the switching tube of single-phase full bridge circuit and three-phase inverter.
Described single-phase full bridge circuit can be operated in following two kinds of patterns: busbar voltage is during lower than set point, and the anti-and diode of single-phase full bridge circuit forms a single-phase rectification bridge, and line voltage is not controlled to rectification, and system work is at rectification electricity condition; Busbar voltage is during higher than set point, the voltage and current signal being obtained according to detection by control circuit carries out closed loop feedback control, drive four switching tube (Q1 of single-phase full bridge circuit, Q2, Q3, opening and turn-offing Q4), with single-phase full-bridge inverter pattern, is converted to the electric energy feeding back on bus and electrical network same frequency and synchronous sinusoidal ac input single-phase electrical network.
Described single-phase integrated energy feedback system is when feedback is generated electricity, line voltage sample circuit is converted to a square-wave signal with electrical network same frequency and same phase single-phase power network signal, in software program, use digital phase-locked loop to follow the tracks of square-wave signal, the phase place of assurance current reference signal and frequency and electrical network are consistent, the size of amplitude is controlled automatically by DC Bus voltage compensatory loop, to electrical network, sends into same frequency and synchronous sinusoidal ac.
The busbar voltage reference value of the present embodiment is 400V, and when DC bus-bar voltage is less than 400V, system works is at rectification state; Otherwise, be operated in feedback generating state.
The current sensor of described three-phase inverter outlet side and motor encoder are respectively Electric Machine Control current feedback signal and feedback speed signal are provided.
The starting current when circuit of Fig. 2 and Fig. 3 is started working for restriction system has increased respectively a soft starting circuit being comprised of current-limiting resistance in parallel and relay in circuit structure.In addition, other situations are all the same with the scheme of Fig. 1, no longer repeat to discuss.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of making within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (4)
1. a single-phase integrated energy feedback system cheaply, be applied to use the power electronic system of single-phase mains supply, the capacitance group, busbar voltage sample circuit, control circuit board, three-phase output inverter and the output current transducer that comprise filter, line voltage sample circuit, input current transducer, parallel connection, also comprise a single-phase full bridge circuit, the mid point of two brachium pontis of described single-phase full bridge circuit connects L line and the N line of single-phase electrical network by filter, two ends of brachium pontis are received on DC bus;
Described single-phase full bridge circuit consists of Q1, Q2, Q3, Q4;
Described busbar voltage sample circuit is for detection of DC bus-bar voltage, and detected value is sent into control circuit board;
Described single-phase full bridge circuit can be operated in rectification and two kinds of patterns of inversion, the energy exchange of realization and electrical network;
Described control circuit sampling busbar voltage, line voltage, input current and three-phase inverter output current, according to the mode of operation of the sampled value decision systems of busbar voltage, and according to the feedback signal of described line voltage sample circuit, input current transducer, busbar voltage sample circuit, three-phase inverter output current transducer and motor encoder, export respectively PWM and drive signal, control conducting and the shutoff of the switching tube of single-phase full bridge circuit and three-phase inverter;
Described capacitance group in parallel is also connected between positive and negative DC bus;
Described filter is comprised of inductance and electric capacity.
2. single-phase integrated energy feedback system cheaply according to claim 1, it is characterized in that: busbar voltage is during lower than set point, anti-and the diode of single-phase full bridge circuit forms a single-phase rectification bridge, and line voltage is not controlled to rectification, and system work is at rectification electricity condition; Busbar voltage is during higher than set point, the voltage and current signal being obtained according to detection by control circuit carries out closed loop feedback control, drive opening and turn-offing of four switching tubes of single-phase full bridge circuit, with single-phase full-bridge inverter pattern, the electric energy feeding back on bus is converted to and electrical network same frequency and synchronous sinusoidal ac input single-phase electrical network.
3. according to the single-phase integrated energy feedback system cheaply described in claim 1 or 2, it is characterized in that: when system is generated electricity in feedback, line voltage sample circuit is converted to a square-wave signal with electrical network same frequency and same phase single-phase power network signal, in software program, use digital phase-locked loop to follow the tracks of square-wave signal, the phase place of assurance current reference signal and frequency and electrical network are consistent, the size of amplitude is controlled automatically by DC Bus voltage compensatory loop, to electrical network, sends into same frequency and synchronous sinusoidal ac.
4. single-phase integrated energy feedback system cheaply according to claim 1, is characterized in that: the current sensor of three-phase inverter outlet side and motor encoder are respectively control motor current feedback signal and feedback speed signal are provided.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024396A (en) * | 2014-04-29 | 2015-11-04 | 西工大常熟研究院有限公司 | Energy feedback frequency converter |
| CN105897011A (en) * | 2016-04-22 | 2016-08-24 | 华为技术有限公司 | PWM rectifier control method and control apparatus |
| CN106788111A (en) * | 2016-11-28 | 2017-05-31 | 广东美芝制冷设备有限公司 | Electric machine control system and its DC bus-bar voltage compensation method, device |
| CN110082588A (en) * | 2019-04-24 | 2019-08-02 | 深圳市迈凯诺电气股份有限公司 | A kind of current detection circuit |
| CN111244884A (en) * | 2019-12-27 | 2020-06-05 | 深圳市合信自动化技术有限公司 | Output end to ground short circuit protection method and device |
| CN112234839A (en) * | 2020-09-30 | 2021-01-15 | 国网陕西省电力公司电力科学研究院 | Hybrid distribution transformer and power-on soft start method thereof |
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| CN201207618Y (en) * | 2008-02-13 | 2009-03-11 | 焦作市明株自动化工程有限责任公司 | Energy feedback device based on power unit series connection type high-voltage frequency transformer |
| US20110103117A1 (en) * | 2009-10-30 | 2011-05-05 | Sanyo Electric Co., Ltd. | Grid interconnection inverter and grid interconnection device |
| CN202712895U (en) * | 2012-06-28 | 2013-01-30 | 比亚迪股份有限公司 | Feedback type battery maintenance system |
| CN203456879U (en) * | 2013-03-21 | 2014-02-26 | 王林兵 | Low-cost single-phase integrated energy feedback system |
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2013
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| CN201207618Y (en) * | 2008-02-13 | 2009-03-11 | 焦作市明株自动化工程有限责任公司 | Energy feedback device based on power unit series connection type high-voltage frequency transformer |
| US20110103117A1 (en) * | 2009-10-30 | 2011-05-05 | Sanyo Electric Co., Ltd. | Grid interconnection inverter and grid interconnection device |
| CN202712895U (en) * | 2012-06-28 | 2013-01-30 | 比亚迪股份有限公司 | Feedback type battery maintenance system |
| CN203456879U (en) * | 2013-03-21 | 2014-02-26 | 王林兵 | Low-cost single-phase integrated energy feedback system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105024396A (en) * | 2014-04-29 | 2015-11-04 | 西工大常熟研究院有限公司 | Energy feedback frequency converter |
| CN105897011A (en) * | 2016-04-22 | 2016-08-24 | 华为技术有限公司 | PWM rectifier control method and control apparatus |
| CN105897011B (en) * | 2016-04-22 | 2019-03-08 | 华为技术有限公司 | A kind of control method and control device of PWM rectifier |
| CN106788111A (en) * | 2016-11-28 | 2017-05-31 | 广东美芝制冷设备有限公司 | Electric machine control system and its DC bus-bar voltage compensation method, device |
| CN106788111B (en) * | 2016-11-28 | 2019-05-24 | 广东美芝制冷设备有限公司 | Electric machine control system and its compensation method of DC bus-bar voltage, device |
| CN110082588A (en) * | 2019-04-24 | 2019-08-02 | 深圳市迈凯诺电气股份有限公司 | A kind of current detection circuit |
| CN111244884A (en) * | 2019-12-27 | 2020-06-05 | 深圳市合信自动化技术有限公司 | Output end to ground short circuit protection method and device |
| CN112234839A (en) * | 2020-09-30 | 2021-01-15 | 国网陕西省电力公司电力科学研究院 | Hybrid distribution transformer and power-on soft start method thereof |
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Application publication date: 20140115 |