CN202305606U - Current harmonic generation device with self-compensation function - Google Patents
Current harmonic generation device with self-compensation function Download PDFInfo
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- CN202305606U CN202305606U CN201120313665XU CN201120313665U CN202305606U CN 202305606 U CN202305606 U CN 202305606U CN 201120313665X U CN201120313665X U CN 201120313665XU CN 201120313665 U CN201120313665 U CN 201120313665U CN 202305606 U CN202305606 U CN 202305606U
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Abstract
The utility model provides a current harmonic generation device with a self-compensation function. The current harmonic generation device comprises a bridge-type converter, an electrolytic capacitor, a reactor, a control and operation circuit, a data acquisition circuit, a voltage Hall sensor and a filtering module. The current harmonic generation device with the self-compensation function has the advantages that: two to sixty times of harmonic wave are generated; a synthetic waveform of waveforms is generated; the amplitude and frequency of harmonic current can be realized by programming; the actual output of the harmonic current basically accords with a simulation waveform; the anti-interference capacity of the current harmonic generation device is high, and the electric energy quality interference state of various kinds of real work condition environments can be simulated; and the current harmonic generation device is convenient to control and has the self-compensation function, so the harmonic wave cannot cause damage to a power grid in a simulated work condition environment, and poor influence cannot be caused on a system.
Description
Technical field
The utility model relates to a kind of current harmonics generating means, in particular to a kind of current harmonics generating means with the self compensation function.
Background technology
Along with the develop rapidly of new high-tech industry and the application of traditional industries employing computer management technology and advanced control technology; Increasing to the responsive load proportion of the quality of power supply in the power consumer, people have proposed renewal, higher requirement to power supply quality and power supply reliability.
The custom power technology that arises at the historic moment (Custom Power) is meant that high-power electric and electronic technology and Distribution Automation Technology integrate, and is foundation with the user to the requirement of the electric reliability and the quality of power supply, for the user provides needed electric power.For improving the quality of power supply; Reduce the loss that defective electric energy brings; Common way is that some custom power equipment (Custom Power Devices is installed between user and electrical network; Be called for short CPD), as: Active Power Filter-APF (APF), dynamic electric voltage recovery device (DVR), dynamic uninterrupted power source (DUPS) and unified electric energy quality controller (UPQC) etc.
For testing the ability of these opertaing devices solution power quality problems; Whether check electrical equipment serviceability meets the requirements; Be badly in need of a kind of quality of power supply countermeasure set that can simulate various real work condition environments; Be the current harmonics generating means, be convenient to test compensation effect and the instrument of electric energy quality compensating device, the antijamming capability of instrument.
The utility model content
The utility model purpose is:
A kind of current harmonics generating means with the self compensation function is provided; Send 60 times with 15 to 20 kinds of synthetic waveforms of interior harmonic wave harmonic; Simulate the quality of power supply disturbance regime of various real work condition environments, to reach compensation effect and the purpose of antijamming capability of test electric energy quality compensating device.
The utility model adopts following technical scheme for realizing above-mentioned purpose:
A kind of current harmonics generating means with the self compensation function is characterized in that comprising bridge-type current transformer 1, bridge-type current transformer 2, electrolytic condenser 3, LRC wave filter 8, LRC wave filter 11, reactor 7, reactor 12, control and computing circuit 4, data acquisition circuit 5, current sensor 9 and current sensor 10; Wherein the secondary line of current sensor 9, current sensor 10 is connected to the input end of control and computing circuit 4 through data acquisition circuit 5; One end of reactor 7, reactor 12 links to each other with current transformer 1, current transformer 2 respectively through LRC wave filter 8, LRC wave filter 11 respectively, and the other end is connected on the system busbar through contactor 6.
Bridge-type current transformer 1 in the technique scheme, bridge-type current transformer 2 can be that each is made up of 3 identical bridge circuit and both positive and negative polarity buses of structure, and each bridge circuit all comprises two insulated gate bipolar power tubes and two fly-wheel diodes; Wherein the drain electrode of the first insulated gate bipolar power tube connects the negative electrode and the positive electrode bus of first fly-wheel diode respectively; The source electrode of the first insulated gate bipolar power tube connects the anode of first fly-wheel diode, the drain electrode of the second insulated gate bipolar power tube, the negative electrode of second fly-wheel diode and an end of LRC wave filter respectively; The source electrode of the second insulated gate bipolar power tube connects the anode and the negative pole bus of second fly-wheel diode respectively, and the grid of first, second insulated gate bipolar power tube connects the control end of control and computing circuit 4 respectively.
LRC wave filter in above-mentioned all technical schemes can be made up of three identical filter branch of structure; Every branch road all has reactor, capacitance series resistance to constitute; Article three, the electric capacity input end of filter branch is connected on an end of filter resistance respectively, and the other end of filter resistance is connected on the reactor that is incorporated into the power networks.
The beneficial effect of the utility model is:
1, send the 2-60 subharmonic, and can send the synthetic waveform of these waveforms, the amplitude of harmonic current and number of times can be realized through programming; Simulate the quality of power supply disturbance state of various real work condition environments, control is convenient;
2, have the self compensation function, harmonic wave can not damaged electrical network again under the simulated condition environment.
Description of drawings
Fig. 1 is the electrical block diagram of current harmonics generating means of the band self compensation function of the utility model.
Embodiment
Below in conjunction with accompanying drawing 1 and specific embodiment, further illustrate the utility model;
Shown in accompanying drawing 1, current transformer 1,6 current transformers that IGBT constitutes 2, direct current capacitors group 3, reactor 7, reactor 12, LRC wave filter 8, LRC wave filter 11, current sensor 9, current sensor 10, contactor 6, data acquisition circuit 5 and controls that device is made up of 6 IGBT and computing circuit 4 are formed jointly.
When contactor 6 closures, device is started working.Current transformer 1 and current transformer 2 each 3 brachium pontis H structure that constitute by 6 IGBT and fly-wheel diode, this structure is by 3 groups of power supplies of direct current capacitors, and current transformer 1 is regulated dc capacitor two ends 3 voltages through the PI control method.In general DC voltage is high more, and the overtone order that can send is high more, and this device is chosen 850V as dc voltage for fear of hardware constraints.Current transformer 2 sends the current waveform that amplitude is identical, phase place is identical, in the opposite direction when current transformer 1 sends harmonic current.Make it to insert the side electric current and do not contain harmonic component basically at electrical network.
Current transformer 1 and the main execution unit of current transformer 2 conduct in this device, each brachium pontis is added in DC voltage on reactor 7 and the reactor 12 through the PWM control strategy, thereby obtains harmonic wave and offset current.
All can make comparisons output current signal and instruction signal at each switch periods control circuit, the margin of error is added in the instruction current of next switch periods, guarantee compensation precision.
The PWM control strategy of this device adopts the Deadbeat control algolithm; Its hardware foundation is that high performance couple of DSP realizes.Compare with simulation control, Digital Control have control flexibly, advantage such as malleable control algolithm and hardware debug be convenient; The principle of this method is the zero hour in each switch periods; The sampling inverter current i that side produces that is incorporated into the power networks; And dope the be incorporated into the power networks current reference value j of side of the inverter zero hour following one-period; Calculate switching time of switching device by difference j-i, make i equal j in the zero hour following one-period.This method calculated amount is bigger, but the characteristics that its switching frequency is fixed, dynamic response is fast are very suitable for the digital control of combining inverter.
Claims (3)
1. the current harmonics generating means with the self compensation function is characterized in that comprising bridge-type current transformer (1), bridge-type current transformer (2), electrolytic condenser (3), LRC wave filter (8), LRC wave filter (11), reactor (7), reactor (12), control and computing circuit (4), data acquisition circuit (5), current sensor (9) and current sensor (10); Wherein the secondary line of current sensor (9), current sensor (10) is connected to the input end of control and computing circuit (4) through data acquisition circuit (5); One end of reactor (7), reactor (12) links to each other with current transformer (1), current transformer (2) respectively through LRC wave filter (8), LRC wave filter (11) respectively, and the other end is connected on the system busbar through contactor (6).
2. the current harmonics generating means of band self compensation function according to claim 1; It is characterized in that said bridge-type current transformer (1), bridge-type current transformer (2) respectively are made up of 3 identical bridge circuit and both positive and negative polarity buses of structure, each bridge circuit all comprises two insulated gate bipolar power tubes and two fly-wheel diodes; Wherein the drain electrode of the first insulated gate bipolar power tube connects the negative electrode and the positive electrode bus of first fly-wheel diode respectively; The source electrode of the first insulated gate bipolar power tube connects the anode of first fly-wheel diode, the drain electrode of the second insulated gate bipolar power tube, the negative electrode of second fly-wheel diode and an end of LRC wave filter respectively; The source electrode of the second insulated gate bipolar power tube connects the anode and the negative pole bus of second fly-wheel diode respectively, and the grid of first, second insulated gate bipolar power tube connects the control end of control and computing circuit (4) respectively.
3. the current harmonics generating means that has the self compensation function according to claim 1 and 2; It is characterized in that said LRC filtration module is made up of three identical filter branch of structure; Every branch road all has reactor, capacitance series resistance to constitute; Article three, the electric capacity input end of filter branch is connected on an end of filter resistance respectively, and the other end of filter resistance is connected on the reactor that is incorporated into the power networks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120313665XU CN202305606U (en) | 2011-08-25 | 2011-08-25 | Current harmonic generation device with self-compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120313665XU CN202305606U (en) | 2011-08-25 | 2011-08-25 | Current harmonic generation device with self-compensation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305606U true CN202305606U (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120313665XU Expired - Fee Related CN202305606U (en) | 2011-08-25 | 2011-08-25 | Current harmonic generation device with self-compensation function |
Country Status (1)
| Country | Link |
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| CN (1) | CN202305606U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279294A (en) * | 2011-08-25 | 2011-12-14 | 江苏德顺祥电气有限公司 | Current harmonic generation device with self-compensating function |
-
2011
- 2011-08-25 CN CN201120313665XU patent/CN202305606U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279294A (en) * | 2011-08-25 | 2011-12-14 | 江苏德顺祥电气有限公司 | Current harmonic generation device with self-compensating function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20200825 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |