CN1929287A - Device capable of returning electrical energy to electrified wire netting - Google Patents
Device capable of returning electrical energy to electrified wire netting Download PDFInfo
- Publication number
- CN1929287A CN1929287A CN 200510029449 CN200510029449A CN1929287A CN 1929287 A CN1929287 A CN 1929287A CN 200510029449 CN200510029449 CN 200510029449 CN 200510029449 A CN200510029449 A CN 200510029449A CN 1929287 A CN1929287 A CN 1929287A
- Authority
- CN
- China
- Prior art keywords
- output
- links
- voltage signal
- inductance
- frequency converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
This invention relates to one device to feedback electricity energy to electricity net, which comprises asynchronous motor and transducer, wherein, the three ends of transducer are connected to network and three output ends to the motor. The invention also comprises SPWM control drive unit, first induction, second induction and third induction current sample signals and direction parent sample voltage connection to the drive unit. The control unit input end is connected tot eh direct voltage signal with output end and IGBT inverse bridge six drive signals.
Description
Technical field
The present invention relates to a kind of be used to handle electric energy that sends when the equipment that drives when frequency converter needs fast braking or potential energy load to transfer and the device that this part electric energy is fed back to electrical network.
Background technology
When the potential energy load of motor deceleration or institute's transmission is transferred, when this moment, motor speed was greater than frequency converter output synchronous speed, mechanical energy stored in the drive system is converted to electric energy through asynchronous motor, this moment, motor was in generating state, six feedback diodes of frequency converter inverter feed back to DC side with this electric energy, cause frequency changer direct current bus voltage to raise and can't operate as normal.So frequency changer direct current bus voltage is remained in the normal range of operation, must handle to these energy; The general processing of prior art is to connect high-power brake resistance it is consumed, i.e. energy consumption braking.But this mode causes energy waste, and produces a large amount of heats, brings pollution to environment.
Summary of the invention
The technical issues that need to address of the present invention have provided a kind of device that electric energy can be fed back to electrical network, are intended to solve above-mentioned defective.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The present invention includes asynchronous motor, frequency converter; Three inputs of described frequency converter link to each other with electrical network, and its three outputs link to each other with asynchronous motor; Also comprise: the dc bus of frequency converter links to each other with three-phase IGBT inverter bridge after electrochemical capacitor E1 filtering, after connecing first inductance, first output of IGBT inverter bridge links to each other with top first main contacts of contactor, second output connects behind second inductance and links to each other with second main contacts in the middle of the contactor, and the 3rd exports and connect behind the 3rd inductance that the 3rd main contacts links to each other below contactor; First output of described contactor outputs to the first input end of frequency converter, and second output outputs to second input of frequency converter, and the 3rd output outputs to the 3rd input of frequency converter; At first output and second output, first electric capacity in parallel, at second output and the 3rd output second electric capacity in parallel, at first output and the 3rd output the 3rd electric capacity in parallel; Described contactor also is connected with the overheated overcurrent under-voltage protection unit of a control contactor break-make; Also comprise a SPWM control drive unit (Sine Wave Pulse Width Modulation); Current sampling signal on described first inductance, second inductance, the 3rd inductance links to each other with the input of SPWM control drive unit respectively with dc bus sampled voltage signal, the input of SPWM control drive unit also links to each other with DC bus-bar voltage signal through electrochemical capacitor respectively, and SPWM control drive unit output links to each other with six drive signals of IGBT inverter bridge;
Compared with prior art, the invention has the beneficial effects as follows: can give electrical network with 97% regenerative electric energy feedback, not only save electric energy greatly, but also very environmental protection: eliminated a large amount of heats that resistance braking produces; Harmonic content is few, and power factor height, and incorporating filter are pollution-free substantially to electrical network.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is the concrete line map of SPWM among Fig. 1;
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
By Fig. 1, Fig. 2 as seen: the present invention includes asynchronous motor 1, frequency converter 2; 2 three inputs of described frequency converter link to each other with electrical network, and its three outputs link to each other with asynchronous motor 1; Also comprise: the dc bus of frequency converter 2 links to each other with three-phase IGBT inverter bridge 3 after electrochemical capacitor E1 filtering, the first output U1 of IGBT inverter bridge 3 connects first inductance L, 1 back and links to each other with top first main contacts of contactor KM1, the second output V1 connects second inductance L, 2 backs and links to each other with second main contacts in the middle of the contactor KM1, and the 3rd output W1 connects the 3rd inductance L 3 back the 3rd main contactss below contactor KM1 and links to each other; First output terminals A of described contactor KM1 outputs to the first input end R of frequency converter, and the second output B outputs to the second input S of frequency converter, and the 3rd output C outputs to the 3rd input T of frequency converter; In first output terminals A and the second output B, first capacitor C 1 in parallel, in the second output B and the 3rd output C second capacitor C 2 in parallel, in first output terminals A and the 3rd output C the 3rd capacitor C 3 in parallel; Described contactor KM1 also is connected with the overheated overcurrent under-voltage protection unit 5 of a control contactor KM1 break-make; Also comprise a SPWM control drive unit 4; Current sampling signal on described first inductance L 1, second inductance L 2, the 3rd inductance L 3 links to each other with the input of SPWM control drive unit 4 respectively with dc bus sampled voltage signal, the input of SPWM control drive unit 4 also links to each other with DC bus-bar voltage signal through electrochemical capacitor E1 respectively, and SPWM control drive unit 4 outputs link to each other with six drive signals of IGBT inverter bridge 3;
Described SPWM control drive unit comprises: the A phase voltage signal links to each other with first resistance R 21 through first rectifier 41, first resistance R 21 links to each other with the positive pole of first amplifier 51 through second resistance R 22 again, be connected with the 3rd resistance R 23 between the anodal and output of first amplifier 51, be connected with first capacitor C 21 between the positive pole of first amplifier 51 and ground, the output of first amplifier 51 links to each other with polarity discriminator 8, the A phase voltage signal also links to each other with polarity discriminator 8, the A phase current signal links to each other with the negative pole of first amplifier 51 through second rectifier 42, the DC bus-bar voltage signal links to each other with PWM chip circuit (pulse-width modulation) 7, the output of PWM chip circuit links to each other with the input of first inverter 6, and the output of first inverter 6 links to each other with the node of first resistance R 21 and second resistance R 22; Described B phase voltage signal is identical with being connected of A phase voltage signal with the C phase voltage signal; Described B phase current signal is connected identical with the C phase current signal with the A phase current signal; Six groups of described polarity discriminator 8 output respectively after the isolation of light lotus root 9 as drive signal G1, G2, G3, G4, G5, the G6 of IGBT inverter bridge 3.
Main performance of the present invention is:
1. the feedback electric current is sinusoidal wave, and from the phase place of motion tracking line voltage, power factor＞0.95.
2. can be according to what of regenerative electric energy, and adjust best brake torque automatically.
Adopt the SPWM rectifier, promptly the chopper-control rectifier makes it be operated in the active inversion state.Detailed process is with the frequency of tens KHz the phase voltage detection signal to be carried out to capacitor charge and discharge, thereby produced the waveform of stack tens KHz triangular waves on the 50Hz sine wave, compare with the actual phase current detection signal as the reference signal with this waveform, its deviation is through having the high-gain amplifier of hysteresis characteristic, control inverter is somebody's turn to do mutually the on-off of two brachium pontis IGBT up and down, thereby the waveform that forces the continuous tracing preset reference signal of actual current has been realized the feedback electric current for sinusoidal wave, and from the phase place of motion tracking line voltage.Adopt acyclic type here, when the positive half cycle of voltage, only the break-make of brachium pontis is gone up in control; And when the voltage negative half cycle, only control the break-make of brachium pontis down.
Overheated overcurrent under-voltage protection unit 5 in the present invention comprises the protective circuit of being made up of elements such as comparator, amplifier, transducers, is protected location commonly used in the prior art.
Adopt a PWM chip (can with the UC3843 biserial 8 pin chips of U.S. UNITRODE company) to produce to have certain duty ratio, frequency is tens KHz, the shared switching signal of three-phase.Regulate the duty ratio of PWM chip output switching signal according to the magnitude of voltage of dc bus: when magnitude of voltage is higher, increase duty ratio, just increase the charging interval of giving electric capacity, reduce and give the capacitance discharges time, sinusoidal wave effective value is increased, so actual feedback current effective value also can increase, thereby has realized the increase brake torque; When magnitude of voltage is low, reduce duty ratio, just reduce charging interval to electric capacity, increase and give the capacitance discharges time, sinusoidal wave effective value is reduced, so actual feedback current effective value also can reduce, thereby has realized reducing brake torque.
Claims (2)
1. an energy feeds back to the device of electrical network with electric energy, comprises asynchronous motor (1), frequency converter (2); (2) three inputs of described frequency converter link to each other with electrical network, and its three outputs link to each other with asynchronous motor (1); It is characterized in that also comprising: the dc bus of frequency converter (2) links to each other with three-phase IGBT inverter bridge (3) after electrochemical capacitor (E1) filtering, first output (U1) of IGBT inverter bridge (3) connects first inductance (L1) back and links to each other with top first main contacts of contactor (KM1), second output (V1) connects second inductance (L2) back and links to each other with second main contacts in the middle of the contactor (KM1), and the 3rd output (W1) connects the 3rd inductance (L3) back and links to each other with the 3rd main contacts below the contactor (KM1); First output (A) of described contactor (KM1) outputs to the first input end (R) of frequency converter, and second output (B) outputs to second input (S) of frequency converter, and the 3rd output (C) outputs to the 3rd input (T) of frequency converter; At first output (A) and second output (B), first electric capacity in parallel (C1), at second output (B) and the 3rd output (C) second electric capacity in parallel (C2), at first output (A) and the 3rd output (C) the 3rd electric capacity (C3) in parallel; Described contactor (KM1) also is connected with the overheated overcurrent under-voltage protection unit (5) of a control contactor (KM1) break-make; Also comprise a SPWM control drive unit (4); Current sampling signal on described first inductance (L1), second inductance (L2) the 3rd inductance (L3) links to each other with the input of SPWM control drive unit (4) respectively with dc bus sampled voltage signal, the input of SPWM control drive unit (4) also links to each other with DC bus-bar voltage signal through electrochemical capacitor (E1) respectively, and SPWM control drive unit (4) output links to each other with six drive signals of IGBT inverter bridge (3).
2. the device that electric energy can be fed back to electrical network according to claim 1, it is characterized in that described SPWM control drive unit (4) comprising: the A phase voltage signal links to each other with first resistance (R21) through first rectifier (41), first resistance (R21) links to each other through the positive pole of second resistance (R22) with first amplifier (51) again, be connected with the 3rd resistance (R23) between the anodal and output of first amplifier (51), be connected with first electric capacity (C21) between the positive pole of first amplifier (51) and ground, the output of first amplifier (51) links to each other with polarity discriminator (8), the A phase voltage signal also links to each other with polarity discriminator (8), the A phase current signal links to each other through the negative pole of second rectifier (42) with first amplifier (51), the DC bus-bar voltage signal links to each other with PWM chip circuit (7), the output of PWM chip circuit links to each other with the input of first inverter (6), and the output of first inverter (6) links to each other with the node of first resistance (R21) with second resistance (R22); Described B phase voltage signal is identical with being connected of A phase voltage signal with the C phase voltage signal; Described B phase current signal is connected identical with the C phase current signal with the A phase current signal; Six groups of described polarity discriminator (8) output respectively after the isolation of light lotus root (9) as drive signal (G1), (G2), (G3), (G4), (G5), (G6) of IGBT inverter bridge (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510029449 CN1929287A (en) | 2005-09-07 | 2005-09-07 | Device capable of returning electrical energy to electrified wire netting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510029449 CN1929287A (en) | 2005-09-07 | 2005-09-07 | Device capable of returning electrical energy to electrified wire netting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1929287A true CN1929287A (en) | 2007-03-14 |
Family
ID=37859126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510029449 Pending CN1929287A (en) | 2005-09-07 | 2005-09-07 | Device capable of returning electrical energy to electrified wire netting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1929287A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101826733A (en) * | 2010-05-06 | 2010-09-08 | 苏州元泰自动化科技有限公司 | System capable of feeding load power energy back to commercial power network |
| CN101882795A (en) * | 2010-05-17 | 2010-11-10 | 宁波倍加福电子科技有限公司 | Regenerative electric energy feedback method for elevator and device thereof |
| CN101456500B (en) * | 2008-12-31 | 2011-03-23 | 杭州浙大太阳电气有限公司 | Control system for energy feedback-brake unit integrated machine of frequency conversion elevator |
| CN101533074B (en) * | 2008-09-22 | 2011-07-20 | 珠海赛比特电气设备有限公司 | Electric energy feedback type electronic load with multi-channel wide voltage input |
| CN105730248A (en) * | 2016-03-03 | 2016-07-06 | 南京南瑞继保电气有限公司 | Locomotive regenerative electric energy feedback system with ice melting function and control method |
-
2005
- 2005-09-07 CN CN 200510029449 patent/CN1929287A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533074B (en) * | 2008-09-22 | 2011-07-20 | 珠海赛比特电气设备有限公司 | Electric energy feedback type electronic load with multi-channel wide voltage input |
| CN101456500B (en) * | 2008-12-31 | 2011-03-23 | 杭州浙大太阳电气有限公司 | Control system for energy feedback-brake unit integrated machine of frequency conversion elevator |
| CN101826733A (en) * | 2010-05-06 | 2010-09-08 | 苏州元泰自动化科技有限公司 | System capable of feeding load power energy back to commercial power network |
| CN101882795A (en) * | 2010-05-17 | 2010-11-10 | 宁波倍加福电子科技有限公司 | Regenerative electric energy feedback method for elevator and device thereof |
| CN101882795B (en) * | 2010-05-17 | 2012-09-26 | 宁波倍加福电子科技有限公司 | Regenerative electric energy feedback method for elevator and device thereof |
| CN105730248A (en) * | 2016-03-03 | 2016-07-06 | 南京南瑞继保电气有限公司 | Locomotive regenerative electric energy feedback system with ice melting function and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100563086C (en) | Active bi-directional electric power adjuster | |
| CN105471238A (en) | Direct current bus voltage ripple compensating method and photovoltaic inverter | |
| CN202841003U (en) | Novel three-phase photovoltaic grid-connected inverter system structure | |
| CN102832842A (en) | Novel three-phase photovoltaic grid-connected inverter system | |
| CN112072716A (en) | Power distribution network terminal electric energy router and control method thereof | |
| CN102856916A (en) | Reactive power control method and circuit of single-phase photovoltaic inverter | |
| CN103887955A (en) | Grid-connected inverter for low-frequency current ripple output restraining of fuel cell and control device | |
| CN101316074A (en) | Back-to-back three-power level midpoint clamping current transformer of wind power generation system | |
| CN1808832A (en) | Circuit apparatus applicable to middle and high power UPS | |
| CN108242816A (en) | A kind of Three-Phase Parallel multi-functional converter and its method of work | |
| CN101005211A (en) | High frequency emergency power system | |
| CN2805210Y (en) | Main circuit for high energy feed back type electronic loading device | |
| CN105703689A (en) | High-power brushless doubly-fed machine three-level bidirectional variable-frequency speed regulation system | |
| CN1852021A (en) | L-source inventer | |
| CN102005772A (en) | Network combination inversion system and control method thereof | |
| CN111478573A (en) | Power factor adjusting framework suitable for single-phase and three-phase power grid and control method thereof | |
| CN109367417A (en) | Two-stage bidirectional power inverter and control method with charging and V2G function | |
| CN2871284Y (en) | Push motor driving system of double inverter | |
| CN1929287A (en) | Device capable of returning electrical energy to electrified wire netting | |
| CN101063440A (en) | Solar,wind energy and commercial power combined power supply without transformer device | |
| CN102570488A (en) | Power conversion system based on energy storage of lithium battery and control method thereof | |
| CN105577013A (en) | Single-phase photovoltaic grid-connected inverter with wide input voltage and low loss | |
| CN209079670U (en) | Two-stage bidirectional power inverter with charging and V2G function | |
| CN103312210A (en) | Three-phase four-wire type three-level photovoltaic grid-connected inverter | |
| CN205039734U (en) | A electromotor drive system for workover |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20070314 |