CN103368199B - Parallelable large energy feedback device electricity-saving device - Google Patents
Parallelable large energy feedback device electricity-saving device Download PDFInfo
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- CN103368199B CN103368199B CN201310122888.1A CN201310122888A CN103368199B CN 103368199 B CN103368199 B CN 103368199B CN 201310122888 A CN201310122888 A CN 201310122888A CN 103368199 B CN103368199 B CN 103368199B
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Abstract
The invention provides a parallelable large energy feedback device electricity-saving device, and belongs to the energy-saving technical field of motors. The invention mainly solves the problem that the existing energy feedback device is very difficult to be applied to large-power occasions. The electricity-saving device is mainly characterized by comprising a module and a control circuit, wherein the module is formed by a three-phase inverter bridge and an LC three-phase filter circuit, the direct current side end of the three-phase inverter bridge is used for being connected with a direct current bus of a converter, an alternating current output side of the three-phase inverter bridge is connected with an electric reactor which is arranged in the LC filter circuit and is not connected with a capacitor, the other end of the electric reactor is used for being connected with a three-phase power grid, the control circuit is formed by a sampling circuit and a DSP (Digital Signal Processor), the output end of the DSP is respectively connected with the control end of the three-phase inverter bridge. With the adoption of the device provided by the invention, direct current electric energy generated by motor brake can be converted into alternating current to be fed back to the power grid, the respond speed is high, the current sharing effect is good, and the reliability is high, and the device is mainly used on the large brake electric energy occasions such as motors of belt conveyors, centrifugal machines and hoisters.
Description
Technical field
The invention belongs to electric motor energy-saving technique field, particularly combine with frequency converter, for the larger occasion of the braking electric energy such as belt feeder, centrifuge, elevator motor can massive energy feedback device battery saving arrangement in parallel.
Background technology
Energy problem is the outstanding problem determining new century social development, and the utilance how improving the energy has caused the concern of the people of the world.Energy feedback type active inverter, as the access port with electrical network, can realize the conversion of direct current and alternating current form, have broad application prospects.The energy of electric capacity in frequency converter can be reverse into and return electrical network with the electric current of line voltage homophase by electric energy feedback system.While mechanical energy being re-used, decrease the caloric value of motor house.Which not only improves the stability of system, also greatly reduce the consumption of electric energy.Some energy back feed device occurs at present, but is mainly applied to the occasion of elevator constant power below class 4 5KW, and industrial occasions General Requirements power is comparatively large, and what have even reaches more than 400KW.But it is larger that unit realizes difficulty, this is because along with the raising of power grade, reactor, IGBT need the electric current that bears larger, heat radiation and the stability of device are affected, in order to solve the problem of energy back feed device capacity constraint, the present invention proposes and a kind ofly energy be carried out parallel connection and realize the method for energy feedback dilatation to meet the larger application scenario of feedback power demand.
Summary of the invention
The object of this invention is to provide one can massive energy feedback device battery saving arrangement in parallel.By the parallel connection by modular energy feedback device, realize the current-sharing of massive energy feedback in parallel running, thus reach the object of high-power dilatation.When multiple stage is in parallel simultaneously, if one breaks down, other device can work as usual, adds the stability of system.
Technical solution of the present invention is: one can massive energy feedback device battery saving arrangement in parallel, it is characterized in that: comprise the module be made up of three phase inverter bridge, LC three-phase filter circuit, and control circuit, wherein, three-phase inversion bridge DC side end is used for being connected with the DC bus of frequency converter, and three phase inverter bridge exchanges outlet side and is connected with the disjunct side reactance of LC three-phase filter circuit neutralizing capacitance, and the other end of reactance is used for being connected with three phase network, control circuit is by direct voltage Acquisition Circuit, three-phase power grid voltage Acquisition Circuit, three phase inverter bridge output current signal Acquisition Circuit, RS485 bus communication circuitry, dsp processor forms, dsp processor output is connected with the control end in three phase inverter bridge respectively, will by control circuit by direct voltage Acquisition Circuit, three-phase power grid voltage Acquisition Circuit, the three-phase power grid voltage that three phase inverter bridge output current signal Acquisition Circuit gathers and three phase inverter bridge output current signal, by calculating the active energy P that inverter bridge exports, reactive energy Q and electric network voltage phase alpha, the feedback of the given and actual active energy of active energy carries out PI adjustment, obtain inverter bridge output voltage and grid phase difference delta, delta and alpha is added the voltage-phase beta just obtaining inverter bridge and need to export, using 0 given as reactive energy, Q is as the feedback of actual reactive energy, carry out PI adjustment, obtain the voltage magnitude U that inverter bridge needs to export.Simultaneously DSP realizes between energy back feed device by RS485 bus communication circuitry Signal share.
Module described in technical solution of the present invention is the module be made up of the three phase inverter bridge of one group of three phase inverter bridge and LC three-phase filter circuit or more than a group and LC three-phase filter circuit, wherein, the wired in parallel that forms of the three phase inverter bridge of more than a group and LC three-phase filter circuit.
Module described in technical solution of the present invention is the module be made up of 2 to 10 group three phase inverter bridges and LC three-phase filter circuit.
When the multiple stage device parallel running be made up of module group and the control circuit of parallel connection, arrange wherein one be main frame, other is from machine.Main frame according to control circuit gather d-c bus voltage value carry out PI control, obtain energy back feed device export active energy given simultaneously by this given by RS485 communication issue from machine.The given of active energy is exported according to RS485 communication data as this device from machine.
Control circuit gathers three-phase power grid voltage and three phase inverter bridge output current signal, by calculating active-power P, reactive power Q and electric network voltage phase alpha that inverter bridge exports.
In the present invention, active-power P, reactive power Q, electric network voltage phase alpha calculates and comprises the steps:
Sampling obtains three-phase power grid voltage Ua, Ub, Uc, energy back feed device feedback three-phase current Ia, Ib, Ic.
The feedback of the given and actual active power of active power carries out PI adjustment, obtains inverter bridge output voltage and grid phase difference delta, delta and alpha is added the voltage-phase beta just obtaining inverter bridge and need to export.
Using 0 given as reactive energy, Q, as the feedback of actual reactive energy, carries out PI adjustment, and obtaining inverter needs output voltage and actual electric network voltage difference
, thus obtain the voltage magnitude of inverter bridge needs output
.
Control circuit needs voltage magnitude U and the phase place beta of output according to inverter bridge, calculates the three-phase voltage that inverter needs to export:
After the voltage that needs export is carried out modulation /demodulation according to actual DC busbar voltage udc by control circuit, send drive singal and control energy back feed device work.
The present invention is owing to adopting by three phase inverter bridge, the module that LC three-phase filter circuit is formed or module group, and by direct voltage Acquisition Circuit, three-phase power grid voltage Acquisition Circuit, three phase inverter bridge output current signal Acquisition Circuit, RS485 bus communication circuitry, the control circuit of dsp processor composition, three-phase inversion bridge DC side end is connected with the DC bus of frequency converter, three phase inverter bridge exchanges outlet side and is connected with the disjunct side reactance of LC three-phase filter circuit neutralizing capacitance, the other end of reactance is connected with three phase network, dsp processor output is connected with the control end in three phase inverter bridge respectively, thus, control circuit can gather direct voltage, three-phase power grid voltage, after three phase inverter bridge output current signal and RS485 communication data carry out integrated treatment, control three phase inverter bridge, the regenerative electric energy that frequency converter produces because of motor braking is returned electrical network.The present invention has fast response time, current-sharing is effective, reliability is high feature.The present invention mainly combines with frequency converter, for the occasion that the braking electric energy such as belt feeder, centrifuge, elevator motor are larger.
Accompanying drawing explanation
Fig. 1 is can the major loop schematic diagram of massive energy feedback device in parallel.
Fig. 2 is can the control circuit board function diagram of massive energy feedback device in parallel.
Fig. 3 is can massive energy feedback device parallel-connection structure figure in parallel.
Fig. 4 can regulate by massive energy feedback device active-power P I in parallel.
Fig. 5 is can massive energy feedback device sampling processing flow chart in parallel.
Fig. 6 can regulate by massive energy feedback device reactive power PI in parallel.
Embodiment
The present invention can massive energy feedback device battery saving arrangement in parallel can isolated operation, also can run by parallel current-sharing.
As shown in Figure 1.Can massive energy feedback device battery saving arrangement (control section) in parallel comprise: three phase inverter bridge, LC three-phase filter circuit and control circuit.Three phase inverter bridge is by 6 IGBT module V1, V2, V3, V4, V5, V6, and 1 group of capacitance module C1, C2 forms, LC three-phase filter circuit is by three-phase reactor La, Lb, Lc and filter capacitor composition, the method of attachment of method of attachment custom circuit as shown in Figure 1, three-phase dc side is connected with the DC bus P of frequency converter through diode VD1, three-phase dc side connects through diode VD2 and N, three phase inverter bridge exchanges the R of the three-phase reactor of outlet side and the disjunct side of LC three-phase filter circuit neutralizing capacitance, S, T holds connection, three phase network JRI is connected with the other end of three-phase reactor.Control circuit is made up of direct voltage Acquisition Circuit, three-phase power grid voltage Acquisition Circuit, three phase inverter bridge output current signal Acquisition Circuit, RS485 bus communication circuitry, dsp processor 2, and dsp processor 2 output is connected with the control end in three phase inverter bridge respectively.Dsp processor 2 has high-speed computation function.Direct voltage Acquisition Circuit, three-phase power grid voltage Acquisition Circuit, three phase inverter bridge output current signal Acquisition Circuit pass to dsp processor 2 by after required signal madulation, dsp processor 2 is output pwm signal after corresponding algorithm process, go out to control three phase inverter bridge, simultaneously dsp processor 2 realizes between energy back feed device by RS485 bus communication circuitry Signal share.The Acquisition Circuit part 1 that direct voltage Acquisition Circuit, three-phase power grid voltage Acquisition Circuit, three phase inverter bridge output current signal Acquisition Circuit are formed and dsp processor 2 are arranged on control circuit board.
As shown in Figure 2.AD sampling plate 9 is by the three-phase voltage JRI collected and ask that step signal 10 receives master board 12, the 6 road pwm signals 13 that master board 12 exports directly arrive IGBT drive circuit plate 14,6 road drive singal 15 of drive circuit board 14 are received on the pin of 6 IGBT16, and IGBT exports and receive AC network 17 after LC filter.
Display floater 11 mainly sets and monitors the operational factor of massive energy feedback device, by RS232 serial ports, the parameter of setting is issued master board 12, the operational factor of device postbacks to display floater 11 by master board 12 simultaneously, then is shown in real time by display floater 11.The phase place of AD sampling plate 9 Real-time Collection electrical network three-phase voltage 18 and amplitude, DC bus-bar voltage 8 and IGBT output to current value Ia, Ib, Ic19 of electrical network.Master board 12 mainly carries out exchanges data with display floater 11, and the signal that Real-time Obtaining AD sampling plate 9 gathers, the signal of acquisition is carried out computing, then sends control signal to IGBT drive circuit plate 14.IGBT drive circuit plate 14 drives turning on and off of IGBT according to the control signal of master board 12, and the output of IGBT outputs to electrical network after three-phase LC filter.
As shown in Figure 3.During the parallel running of multiple stage energy back feed device, arrange wherein one be main frame 3, other is from machine 4,5; Multiple stage device can simultaneously on-line operation, and every table apparatus output current is identical.
As shown in Figure 4.Main frame according to control circuit gather d-c bus voltage value carry out PI control, obtain energy back feed device export active energy given simultaneously by this given by RS485 communication issue 6.The given of active energy is exported according to RS485 communication data as this device from machine.
As shown in Figure 5.Control circuit gathers three-phase power grid voltage and three phase inverter bridge output current signal, by calculating active-power P 1, reactive power Q 1, line voltage that inverter bridge exports
with phase place alpha.Active-power P 1, reactive power Q 1, electric network voltage phase alpha calculates and comprises the steps:
three-phase current is exported to energy feedback and carries out CLARKE conversion, calculate electric current under two rest frames
,
:
As shown in Fig. 4 ~ 6.The feedback of the given and actual active power of active power carries out PI adjustment, obtains inverter bridge output voltage and grid phase difference delta, delta and alpha is added the voltage-phase beta just obtaining inverter bridge and need to export.Using 0 given as reactive energy, Q1, as the feedback of actual reactive energy, carries out PI adjustment, and obtaining inverter needs output voltage and actual electric network voltage difference
, thus obtain the voltage magnitude of inverter bridge needs output
circuit control panel needs voltage magnitude U and the phase place beta of output according to inverter bridge, calculates the three-phase voltage that inverter needs to export:
After the voltage that needs export is carried out modulation /demodulation according to actual DC busbar voltage udc by control circuit, send drive singal and control energy back feed device work.
Claims (2)
1. can a massive energy feedback device battery saving arrangement in parallel, it is characterized in that: comprise the module be made up of three phase inverter bridge, LC three-phase filter circuit, and control circuit; Wherein, three-phase inversion bridge DC side end is used for being connected with the DC bus of frequency converter, and three phase inverter bridge exchanges outlet side and is connected with the disjunct side reactance of LC three-phase filter circuit neutralizing capacitance, and the other end of reactance is used for being connected with three phase network; Control circuit is made up of direct voltage Acquisition Circuit, three-phase power grid voltage Acquisition Circuit, three phase inverter bridge output current signal Acquisition Circuit, RS485 bus communication circuitry, dsp processor, and dsp processor output is connected with the control end in three phase inverter bridge respectively; Described module is the wired in parallel be made up of the three phase inverter bridge of more than a group and LC three-phase filter circuit, and wherein one group of module is main frame, and other group module is from machine; Control circuit gathers three-phase power grid voltage Ua, Ub, Uc, energy back feed device feedback three-phase current Ia, Ib, Ic, carries out CLARKE conversion to three-phase power grid voltage, calculates voltage under two rest frames
,
:
By right
,
convert, obtain electric network voltage phase alpha and grid voltage amplitude
:
Three-phase current is exported to energy feedback and carries out CLARKE conversion, calculate electric current under two rest frames
,
:
Active-power P is calculated, reactive power Q according to the voltage and current under rest frame:
The feedback of the given and actual active power of active power carries out PI adjustment, obtains inverter bridge output voltage and grid phase difference delta, delta and alpha is added the voltage-phase beta just obtaining inverter bridge and need to export,
Using 0 given as reactive energy, Q, as the feedback of actual reactive energy, carries out PI adjustment, and obtaining inverter bridge needs output voltage and actual electric network voltage difference
, thus obtain the voltage magnitude of inverter bridge needs output
,
Control circuit needs voltage magnitude Uo and the phase place beta of output according to inverter bridge, calculates the three-phase voltage that inverter bridge needs to export:
After the voltage that needs export is carried out modulation /demodulation according to actual DC busbar voltage udc by control circuit, send drive singal and control energy back feed device work.
2. one according to claim 1 can massive energy feedback device battery saving arrangement in parallel, it is characterized in that: described module is the module be made up of 2 to 10 group three phase inverter bridges and LC three-phase filter circuit.
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| CN201072438Y (en) * | 2007-05-15 | 2008-06-11 | 北京索英电气技术有限公司 | Multi-input channel modularized high-frequency isolation single phase electric energy feedback type electronic load |
| CN101789710A (en) * | 2010-02-09 | 2010-07-28 | 深圳市贵鸿达电子有限公司 | Solar three-phase grid-connected inverter |
| CN102780414A (en) * | 2012-01-13 | 2012-11-14 | 广东志成冠军集团有限公司 | Device and method for inhibiting inrush starting current for large-power grid-connected inverter |
| CN102916435A (en) * | 2012-09-20 | 2013-02-06 | 中国电力科学研究院 | Battery energy-storage power conversion system containing Z source network and control method therefor |
| CN202737484U (en) * | 2012-08-29 | 2013-02-13 | 华南理工大学 | DSP-based energy-feedback electronic load grid-connected inversion system |
| CN203205890U (en) * | 2013-04-10 | 2013-09-18 | 万洲电气股份有限公司 | Power saving device for parallelable large-scale energy feedback device |
-
2013
- 2013-04-10 CN CN201310122888.1A patent/CN103368199B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201072438Y (en) * | 2007-05-15 | 2008-06-11 | 北京索英电气技术有限公司 | Multi-input channel modularized high-frequency isolation single phase electric energy feedback type electronic load |
| CN101789710A (en) * | 2010-02-09 | 2010-07-28 | 深圳市贵鸿达电子有限公司 | Solar three-phase grid-connected inverter |
| CN102780414A (en) * | 2012-01-13 | 2012-11-14 | 广东志成冠军集团有限公司 | Device and method for inhibiting inrush starting current for large-power grid-connected inverter |
| CN202737484U (en) * | 2012-08-29 | 2013-02-13 | 华南理工大学 | DSP-based energy-feedback electronic load grid-connected inversion system |
| CN102916435A (en) * | 2012-09-20 | 2013-02-06 | 中国电力科学研究院 | Battery energy-storage power conversion system containing Z source network and control method therefor |
| CN203205890U (en) * | 2013-04-10 | 2013-09-18 | 万洲电气股份有限公司 | Power saving device for parallelable large-scale energy feedback device |
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