CN2624515Y - Reactive power compensating device of frequency converter - Google Patents
Reactive power compensating device of frequency converter Download PDFInfo
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- CN2624515Y CN2624515Y CN 03245270 CN03245270U CN2624515Y CN 2624515 Y CN2624515 Y CN 2624515Y CN 03245270 CN03245270 CN 03245270 CN 03245270 U CN03245270 U CN 03245270U CN 2624515 Y CN2624515 Y CN 2624515Y
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- circuit
- reactive power
- frequency converter
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- power compensation
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Abstract
The utility model relates to a frequency converter reactive power compensation device, which connects a reactive power compensation device to a secondary low voltage side of a multi-secondary rectifying transformer, and is controlled by a SCM and a host, adopts the dynamic reactive power compensation technology, the induction reactive power generated by AC-AC frequency converter can be counteracted locally with a capacitance reactive power given by a compensation device, the dual-tuning wideband filter of the compensation device can locally filter the harmonic wave and intermittent harmonic wave generated by the AC-AC frequency converter to improve the power factor, stabilize the grid voltage, manage the harmonic wave and intermittent harmonic wave according to national standards, reduce the output capacity of rectifying transformer and save the energy. The device is mainly used for metallurgy and steel rolling field.
Description
Technical field
The utility model relates to a kind of reactive power compensation device, refers in particular to a kind of ac-ac frequency converter load low pressure dynamic reactive power compensation equipment on the spot.
Background technology
The dynamic reactive power compensation technique is applied to ac-ac frequency converter, the lagging reactive power of compensating load, a filtering harmonic wave and a harmonic wave reactive power have had the history in twenties years.At present, all be to adopt at 5 times, 7 times, 11 times, 13 times high pass filters of high-pressure side installation of rectifier transformer and controllable silicon Controlled Reactor to solve the reactive power compensation problem in the world.The major defect of this technology is:
The first, compensation effect is poor: after the compensation, though can play a role to the stable high voltage line voltage, still can produce bigger voltage fluctuation but ac-ac frequency converter load fundamental wave reactive power impulse current flows into the leakage reactance that is produced behind the rectifier transformer, be unfavorable for ac-ac frequency converter operation work in low-pressure side.
The second, filtration efficiency is low: when compensating a high-pressure side, its 5 times, 7 times, 11 times, 13 times high pass filter is undesirable to the filtration result of a harmonic wave and a harmonic wave, for harmonic wave is up to state standards, can only require electric power system that bigger capacity of short circuit is provided or require ac-ac frequency converter to adopt 24 commutating phase technology, its result will cause the raising of operating cost or equipment cost.
Three, transformer loss is big: after the compensation, the power supply capacity of rectifier transformer does not reduce, and the loss on rectifier transformer is also bigger, and this loss generally will account for 2% of load active power.
The 4th: the loss of controllable silicon Controlled Reactor is big: because the high pass resistance loss of 5 times, 7 times, 11 times, 13 times high pass filters is big, make the loss of controllable silicon Controlled Reactor also bigger, the loss of high pressure compensation device generally will account for the 5-8% of load active power.
Therefore, carry out the compensation of reactive power in high-pressure side of rectifier transformer, can not effectively administer the interference of a harmonic wave and a harmonic wave, its effect energy-conservation and the raising power factor is also undesirable.
Summary of the invention
The technical problems to be solved in the utility model is: a kind of device that carries out the dynamic reactive power compensation in the rectifier transformer secondary low-pressure side is provided, this device is a harmonic wave and a harmonic wave of the generation of filtering ac-ac frequency converter on the spot, increase substantially the power factor of load, reach stable line voltage, reduction rectifier transformer output capacity and purpose of energy saving.
The utility model is that the technical scheme that its technical problem of solution is adopted is: a kind of frequency converter reactive power compensation device comprises many secondary rectifier transformer S and the ac-ac frequency converter F that is powered by three phase mains; But also comprise the multi-channel compensating system device D, the main controller E that constitute by inverse parallel silicon SCR and controlled broadband filter LC.Multi-channel compensating system device D is connected in the current circuit of each secondary of rectifier transformer S, but main controller E links to each other with the gate pole of each inverse parallel silicon SCR, each secondary of many secondary rectifier transformer S and the input of ac-ac frequency converter F join, and the output of ac-ac frequency converter F is connected with load motor M.Each secondary of many secondary rectifier transformer S is connected to a broadband filter L1C1L2, constitutes the double tunning broadband filter by controlled broadband filter LC and broadband filter L1C1L2.
Main controller E is by detecting input buffer circuit G, reactive power testing circuit H, reactive power compensation management circuit I, SCR control circuit J, optical fiber driving circuit K, failure diagnosis treatment circuit N, diagnosis input buffer circuit O, soft-touch control liquid crystal Chinese display circuit P, combined network communication circuit Q and host computer R form, be separately installed with the voltage transformer that is used to measure the current transformer of phase load electric current and is used for slotted line voltage in the three-phase current loop of ac-ac frequency converter F, the output difference of this current transformer and this voltage transformer input buffer circuit G after testing links to each other with the input port of reactive power testing circuit H; But the output port of SCR control circuit J links to each other with the gate pole of each inverse parallel silicon SCR by optical fiber driving circuit K; Be used to detect offset current, grid line voltage, radiator temperature, vacuum switch state and blower fan electric current each transducer output respectively after diagnosing the input port of input buffer circuit Q and failure diagnosis treatment circuit N join, the output port of failure diagnosis treatment circuit N links to each other with failure alarm circuit; Between reactive power testing circuit H, reactive power compensation management circuit I, SCR control circuit J and the failure diagnosis treatment circuit N respectively the form with parallel bus interconnect; Pass through combined network communication circuit Q with the form of 485 buses respectively between reactive power testing circuit H, reactive power compensation management circuit I, SCR control circuit J and the failure diagnosis treatment circuit N and link to each other with host computer R, also the form with 485 buses is connected with soft-touch control liquid crystal Chinese display circuit P.
Reactive power testing circuit H, reactive power compensation management circuit I, SCR control circuit J, barrier diagnostic process circuit N are connected by 16 Single-chip Controlling respectively with combined network communication circuit Q.
The beneficial effects of the utility model are::
1, after the compensation, not only rectifier transformer primary side line voltage is stable, and rectifier transformer secondary side line voltage is also stable, has improved power supply quality.
2, the double tunning broadband filter in the compensation arrangement has a higher harmonic wave and a harmonic filtration rate, and the improvement to harmonic wave under any design conditions all can be up to state standards.
3, after the compensation, the rectifier transformer power supply capacity reduces more than 50%, has not only reduced the cost of rectifier transformer, and makes the loss of rectifier transformer reduce more than 50%.
4, special double tunning broadband filter own loss is less than 1% of installed capacity.After the compensation, consider that the loss of rectifier transformer reduces more than 50%, can further obtain power savings.Compare with at present general high-pressure side compensation arrangement, can further obtain the energy-saving efficiency of 5-8%.
5, special double tunning broadband filter amplitude-frequency characteristic is insensitive to inductance and capacitance parameter variation, helps the stability and the reliability of work.
Description of drawings
Fig. 1 is the utility model system connection layout.
Fig. 2 is the utility model multi-channel compensating system device circuit theory diagrams.
Fig. 3 is the utility model double tunning broadband filter amplitude frequency curve figure.
Fig. 4 is the utility model host system block diagram.
Fig. 5 is the utility model optical fiber driving circuit schematic diagram.
Fig. 6 is the utility model reactive power testing circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is done to describe in further detail.
As Fig. 1, shown in Figure 2, ac-ac frequency converter F is the drive unit of high-power AC motor, generally power by the rectifier transformer of secondary more than many S, but a low pressure that is made of three tunnel inverse parallel silicon SCR and controlled broadband filter LC dynamic reactive power compensator on the spot is installed respectively at each secondary of rectifier transformer, and control by main controller E, multi-channel compensating system device D is connected in the current circuit of each secondary of rectifier transformer S, but main controller E links to each other with the gate pole of each inverse parallel silicon SCR, each secondary of many secondary rectifier transformer S and the input of ac-ac frequency converter F join, and the output of ac-ac frequency converter F is connected with load motor M.Each secondary of many secondary rectifier transformer S is connected to a broadband filter L1C1L2, and this broadband filter L1C1L2 and controlled broadband filter LC form the double tunning broadband filter jointly.But the electronic switch that three tunnel inverse parallel silicon SCR constitute control double tunning broadband filter is with 10mS speed input and withdraw from electrical network.When the double tunning broadband filter withdraws from electrical network, the direct voltage at using silicon controlled little logical technology control capacitor two ends; When the double tunning broadband filter need drop into electrical network, the control controllable silicon its both end voltage be zero and the both end voltage rate of change also be to drop into electrical network under zero situation, the filter electric current does not smoothly have impact when guaranteeing to drop into.Parameter in milling train 12MVAR reactive power compensation device major loop is respectively C=926 μ F, L=117 μ H, L2=100 μ H, L1=109 μ H, C1=640 μ F.Consider the control loop that constitutes by main controller E and the insulation of high pressure major loop, deliver to the controllable silicon gate pole through optical fiber and optical fiber driving circuit K from the signal of control loop.
That shown in Figure 3 is the amplitude frequency curve figure of double tunning broadband filter to an ac-ac frequency converter harmonic wave and a harmonic current source.5 times, 7 subharmonic and near it between harmonic wave mainly offset by the method for attachment of many secondary rectifier transformer S, double tunning broadband filter emphasis is at 500H
zTo 700H
zForm Low ESR district, broadband, so as filtering 11 times, 13 subharmonic and near it between harmonic wave.I
HBe the harmonic current source electric current of ac-ac frequency converter S, I
BFor flowing into the harmonic current of many secondary rectifier transformer F, I
FFor flowing into the harmonic current of double tunning broadband filter.Form Low ESR district, broadband, double tunning broadband filter rejection rate I at 500HZ to 700HZ
F/ I
HGreater than 80%.
As shown in Figure 4, main controller E is formed by detecting input buffer circuit G, reactive power testing circuit H, reactive power compensation management circuit I, SCR control circuit J, optical fiber driving circuit K, failure diagnosis treatment circuit N, diagnosis input buffer circuit O, soft-touch control liquid crystal Chinese display circuit P, combined network communication circuit Q and host computer R, and respectively by 16 Single-chip Controlling.Be separately installed with the voltage transformer that is used to measure the current transformer of phase load electric current and is used for slotted line voltage in the three-phase current loop of ac-ac frequency converter F, the output difference of this current transformer and this voltage transformer input buffer circuit G after testing links to each other with the input port of reactive power testing circuit H, ac-ac frequency converter F drives the milling train alternating current machine and belongs to the load of reactive power impact, reactive power testing circuit H adopts transient state reactive power algorithm, and 3.3mS just calculates the fundamental wave reactive power power that compensate.Reactive power compensation management circuit I determines those double tunning broadband filter needs inputs or withdraws from electrical network according to the fundamental wave reactive power power that should compensate.But the output port of SCR control circuit J links to each other with the gate pole of each inverse parallel silicon SCR by optical fiber driving circuit K.Be used to detect offset current, grid line voltage, radiator temperature, the output of each transducer of vacuum switch state and blower fan electric current respectively after diagnosing the input port of input buffer circuit Q and failure diagnosis treatment circuit N join, the overvoltage of this failure diagnosis treatment circuit N analysis and judgement, under-voltage, phase shortage, the phase sequence mistake, overcurrent, overload, current imbalance, the controllable silicon short circuit, controllable silicon opens circuit, the vacuum switch tripping operation, the radiator overtemperature, the cabinet fan trouble, communication failure etc., and Chinese prompt failure condition, the output port of failure diagnosis treatment circuit N links to each other with failure alarm circuit, in order to sound and light alarm.Between reactive power testing circuit H, reactive power compensation management circuit I, SCR control circuit J and the failure diagnosis treatment circuit N respectively the form with parallel bus interconnect.Reactive power testing circuit H; reactive power compensation management circuit I; passing through combined network communication circuit Q with the form of 485 buses respectively between SCR control circuit J and the failure diagnosis treatment circuit N links to each other with host computer R; also the form with 485 buses is connected with soft-touch control liquid crystal Chinese display circuit P; this combined network communication circuit Q is sent to host computer detecting data and failure condition; so that preserve and manage these data; grasp harmonic filtration effect between reactive power compensation and harmonic wave; this soft-touch control liquid crystal Chinese display circuit P is by the voltage of all detections of operational observations of soft-touch control; electric current; radiator temperature and all on off states, and running parameter and the protection parameter that all power down are not lost is set.
As shown in Figure 6, model is that 16 single-chip microcomputer U6 of 87196KC are the host computer single-chip microcomputer.Its analog signal input is from the threephase potential transformer J1 of specified output 100V standard and No. three current transformer J2 of specified output 5mA standard.Its switching signal input is from the normal opened contact of " dropping into/withdraw from " switch of main controller E.Detect input buffer circuit G and comprise voltage buffer circuit and current buffering circuit, wherein voltage buffer circuit is the amplifier L of LM324 by model
2AAnd L
1DThe difference filter of forming is finished; Current buffering circuit is by amplifier L
1C, L
2BAnd L
2CThe emitter follower of forming is finished.Model is the U of X25043
4Be memory, be used to store the calculating parameter that power down is not lost.16 single-chip microcomputer U
6Control two-way communication I/O serial RS-485 bus, the one tunnel is parallel/serial conversion chip U of 89C2051 through model
7With model be 75184 chip for driving U
5And connector J5 is connected to the combined network communication circuit; Another road is through chip for driving U
3And connector J4 is connected to controllable silicon pulse control circuit and reactive power compensation management circuit.
As shown in Figure 5, optical fiber driving circuit K is divided into multichannel, wherein each road is made of stabilized voltage power supply U1, constant-current supply U2, differential circuit RE, VMOS pipe M1 and optical fiber recipient G1 respectively, the dc power supply terminal of stabilized voltage power supply U1 and optical fiber recipient G1 joins, the control utmost point of VMOS pipe M1 links to each other with the output of optical fiber recipient G1, the input of its output stage and constant-current supply U2 joins, the output port of the input of optical fiber recipient G1 and SCR control circuit J joins, but differential circuit RE is connected with the gate pole of inverse parallel silicon SCR.10KV insulated power supplies transformer T
1, diode rectifier bridge D
1D
2D
3D
4, electrolytic capacitor E
1Form the 12V DC power supply.VMOS pipe M1, constant-current supply U2 form the 270mA constant-current source circuit.Because R
3And E
2, R
6And E
3The derivative action, pulse front edge forms 500mA and triggers by force.The break-make of VMOS pipe M1 is controlled by optical fiber recipient R-2521.Optical fiber recipient R-2521 requires stabilized voltage power supply U1 that stable 6V power supply is provided.Optical fiber is unglazed, and the controllable silicon gate current is zero; Optical fiber has light, and the controllable silicon gate current is forward position 500mA, and stabling current is 270mA.
Because the utility model is connected in reactive power compensation device the secondary low-pressure side of many secondary rectifier transformer, and by single-chip microcomputer and PC control, make the primary side line voltage stable, have a higher harmonic wave and a harmonic filtration rate, the loss of rectifier transformer and double tunning broadband filter reduces, obtain further power savings, improved the stability and the reliability of control system.
Claims (5)
1, a kind of frequency converter reactive power compensation device, comprise many secondary rectifier transformer (S) and the ac-ac frequency converter (F) of powering, it is characterized in that by three phase mains: but also comprise multi-channel compensating system device (D), the main controller (E) that constitutes by inverse parallel silicon (SCR) and controlled broadband filter (LC); Multi-channel compensating system device (D) is connected in the current circuit of each secondary of rectifier transformer (S), main controller (E) but link to each other with the gate pole of each inverse parallel silicon (SCR), the input of each secondary of many secondary rectifier transformer (S) and ac-ac frequency converter (F) joins, and the output of ac-ac frequency converter (F) is connected with load motor (M).
2, frequency converter reactive power compensation device according to claim 1 is characterized in that: each secondary of described many secondary rectifier transformer (S) is connected to one (L1C1L2) broadband filter.
3, frequency converter reactive power compensation device according to claim 1, it is characterized in that: described main controller (E) is by detecting input buffer circuit (G), reactive power testing circuit (H), reactive power compensation management circuit (I), SCR control circuit (J), optical fiber driving circuit (K), failure diagnosis treatment circuit (N), diagnosis input buffer circuit (O), soft-touch control liquid crystal Chinese display circuit (P), combined network communication circuit (Q) and host computer (R) are formed, hand over and be separately installed with the voltage transformer that is used to measure the current transformer of phase load electric current and is used for slotted line voltage in the three-phase current loop of an ac frequency converter (F), the output of this current transformer and this voltage transformer distinguishes after testing that input buffer circuit (G) links to each other with the input port of reactive power testing circuit (H); The output port of SCR control circuit (J) passes through optical fiber driving circuit (K) but links to each other with the gate pole of each inverse parallel silicon (SCR); Be used to detect offset current, grid line voltage, radiator temperature, vacuum switch state and blower fan electric current each transducer output respectively after diagnosing the input port of input buffer circuit (Q) and failure diagnosis treatment circuit (N) join, the output port of failure diagnosis treatment circuit (N) links to each other with failure alarm circuit; Between reactive power testing circuit (H), reactive power compensation management circuit (I), SCR control circuit (J) and the failure diagnosis treatment circuit (N) respectively the form with parallel bus interconnect; Pass through combined network communication circuit (Q) with the form of 485 buses respectively between reactive power testing circuit (H), reactive power compensation management circuit (I), SCR control circuit (J) and the failure diagnosis treatment circuit (N) and link to each other with host computer (R), also the form with 485 buses is connected with soft-touch control liquid crystal Chinese display circuit (P).
4, according to claim 1 or 3 described frequency converter reactive power compensation devices, it is characterized in that: described reactive power testing circuit (H), reactive power compensation management circuit (I), SCR control circuit (J), failure diagnosis treatment circuit (N) and combined network communication circuit (Q) are connected by 16 Single-chip Controlling respectively.
5, according to claim 1 or 3 described frequency converter reactive power compensation devices, it is characterized in that: described optical fiber driving circuit (K) is divided into multichannel, wherein each road is respectively by stabilized voltage power supply (U1), constant-current supply (U2), differential circuit (RE), VMOS pipe (M1) and optical fiber recipient (G1) constitute, the dc power supply terminal of stabilized voltage power supply (U1) and optical fiber recipient (G1) joins, the control utmost point of VMOS pipe (M1) links to each other with the output of optical fiber recipient (G1), the input of its output stage and constant-current supply (U2) joins, the output port of the input of optical fiber recipient (G1) and SCR control circuit (J) joins, differential circuit (RE) but be connected with the gate pole of inverse parallel silicon (SCR).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03245270 CN2624515Y (en) | 2003-04-16 | 2003-04-16 | Reactive power compensating device of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03245270 CN2624515Y (en) | 2003-04-16 | 2003-04-16 | Reactive power compensating device of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2624515Y true CN2624515Y (en) | 2004-07-07 |
Family
ID=34251546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03245270 Expired - Fee Related CN2624515Y (en) | 2003-04-16 | 2003-04-16 | Reactive power compensating device of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2624515Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100414806C (en) * | 2005-05-30 | 2008-08-27 | 广州南方电力集团电器有限公司 | On-the-spot surge-free reactive compensator for motor |
| CN107342158A (en) * | 2017-06-19 | 2017-11-10 | 朱立仁 | Transformer and its automatic protecting method |
-
2003
- 2003-04-16 CN CN 03245270 patent/CN2624515Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100414806C (en) * | 2005-05-30 | 2008-08-27 | 广州南方电力集团电器有限公司 | On-the-spot surge-free reactive compensator for motor |
| CN107342158A (en) * | 2017-06-19 | 2017-11-10 | 朱立仁 | Transformer and its automatic protecting method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |