CN202550535U - Current quality adjustment device - Google Patents
Current quality adjustment device Download PDFInfo
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- CN202550535U CN202550535U CN2012201352447U CN201220135244U CN202550535U CN 202550535 U CN202550535 U CN 202550535U CN 2012201352447 U CN2012201352447 U CN 2012201352447U CN 201220135244 U CN201220135244 U CN 201220135244U CN 202550535 U CN202550535 U CN 202550535U
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- power supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
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Abstract
The utility model discloses a current quality adjustment device, and relates to a circuit device which is used for an alternating-current trunk line or an alternating-current distribution network, in particular to a device which is suitable for stabilizing voltage and reducing harmonic waves or ripples for a high-voltage alternating-current power grid. The device comprises a current adjustment module and a detection and control module, wherein the current adjustment module and a sensitive load are connected in parallel to a three-phase system power supply; the current adjustment module is a multilevel cascaded insulated gate bipolar transistor (IGBT) power module which is in Y-type connection; every phase comprises n serially-connected fundamental current compensation units; main circuits of the fundamental current compensation units are H bridge power unit circuits which are formed by connecting IGBTs; the alternating-current sides of the H bridge power unit circuits in the same phase are serially connected in sequence; one end in the serial connection is connected to a public point in the Y-type connection; and the other end in the serial connection is serially connected with a first inductor element and connected to the three-phase system power supply. By the device, the power quality of power supply to a sensitive user can be obviously improved, the faults of the power grid and electric equipment of the sensitive load can be reduced, the loss of the power grid can be reduced, and the power utilization rate can be increased.
Description
Technical field
The utility model relates to a kind of circuit arrangement that is used for ac mains or ac distribution network, relates in particular to a kind of high-voltage alternating electrical network burning voltage and device that reduces harmonic wave or ripple of being applicable to.
Background technology
Modern industry, commerce and residential electricity consumption equipment in the urban distribution network; Like high-performance office equipment, accurate laboratory apparatus, frequency control equipment, programmable logic controller (PLC), various automatic assembly line and computer system etc. power supply characteristic is changed the sensitiveness load and be ascendant trend year by year, the requirement of the quality of power supply is improved constantly.As far as sensitive users (like semiconductor manufacturing enterprise), the voltage dip of a few tens of milliseconds just possibly cause device damage, production line to stop production, and causes the tremendous economic loss.Meanwhile, the factors such as a large amount of accesses of distributed energy, impact and interference load all make the electrical network quality of power supply have trend, the safe operation of serious threat electric power system and the operate as normal of power consumption equipment that worsens day by day.
To sensitive load quality of power supply control problem, carried out the research manufacturing of quality of power supply control product both at home and abroad.But; Quality of power supply control device does not also form standardized product; And mainly rest on low pressure low capacity scope, Chinese utility model patent " low harmonic wave power quality control system " (utility model patent number: ZL201020133972 publication number: CN201656479) disclose a kind of low harmonic wave power quality control system.Should low harmonic wave power quality control system comprise checkout gear, electric power adjusting device, resistive load device.Checkout gear receives the feedback signal that comes from the resistive load device.The control signal of checkout gear output can use voltage or electric current to be signal.After the electric power adjusting device receives said control signal, with ratio mode outputting drive voltage.Said ratio mode is for exporting the total power driving voltage at continuous output time at interval, and continuously not output time stop to export the total power driving voltage at interval.After the resistive load device received driving voltage, output feedback signal was to checkout gear.Export the total power driving voltage with the ratio mode at interval at continuous output time, and continuously not output time stop to export the total power driving voltage at interval, can effectively reduce the harmonic wave that produces electric power.But this device is only applicable to low power resistive load device, is not suitable for the electrical network quality of power supply control of high-power; Its objective is of the influence of the harmonic wave of minimizing resistive load device generation to power quality, rather than through improving the quality of power supply of power supply grid, for sensitive loads provides higher-quality power supply.
The utility model content
The purpose of the utility model is that a kind of electric current quality regulator will be provided, and solution improves the sensitive users power supply quality of power supply, the technical problem of the fault of minimizing electrical network and sensitive loads power consumption equipment, reduction grid loss, raising utilization rate of electrical.
The utility model solves the problems of the technologies described above the technical scheme that is adopted:
A kind of electric current quality regulator; Comprise current regulating module and detect control module; Described current regulating module and sensitive loads are parallel-connected on the three-phase system power supply, and the detection input of described detection control module is connected to the three-phase system power supply, the control output end of described detection control module; Be connected to current regulating module, it is characterized in that:
The multipleization cascade IGBT power model that described current regulating module connects for the Y type, each comprises n the fundamental current compensating unit that is connected in series, wherein 1≤n≤20 mutually;
The main circuit of described fundamental current compensating unit is the H bridge power unit circuit that IGBT connects to form; The AC side of each H bridge power unit circuit of same phase is connected successively; One end is connected to the common point that the Y type connects; The other end is connected on the three-phase system power supply that is connected to sensitive loads with after first inductance element is connected.
A kind of preferable technical scheme of the electric current quality regulator of the utility model is characterized in that described current regulating module also is provided with the harmonic current compensation unit; The main circuit of described harmonic current compensation unit is the H bridge power unit circuit that IGBT connects to form; Described harmonic current compensation unit is parallel-connected to the two ends of first inductance element with after second inductance element is connected.
A kind of improved technical scheme of the electric current quality regulator of the utility model is characterized in that described detection control module comprises digital signal processor, signal condition element and current/voltage-converted element; Described digital signal processor is provided with AD converter and PWM output port, and the input end of analog signal of said AD converter is connected to three-phase system power source voltage instrument transformer summation current transformer through signal condition element and current/voltage-converted element; Said PWM output port is connected respectively to the grid of the IGBT of each harmonic current compensation unit, roadbed ripple current compensation unit through the IGBT drive circuit; Described digital signal processor is connected to the grid monitoring system of three-phase system power supply through NIU.
A kind of improved technical scheme of the electric current quality regulator of the utility model; It is characterized in that described detection control module also comprises NIU, described digital signal processor is connected to the grid monitoring system of three-phase system power supply through NIU.
The beneficial effect of the utility model is:
1. the electric current quality regulator of the utility model can significantly improve the sensitive users power supply quality of power supply, reduces fault, reduction grid loss, the raising utilization rate of electrical of electrical network and sensitive loads power consumption equipment.
2. adopt multipleization cascade IGBT power model; Series connection through power cell; Reduced the requirement of withstand voltage of power device, can adopt technology maturation, cheap low pressure IGBT to form inversion unit, through the number adaptation different output voltage requirement of series unit.
3. because inverter adopts multipleization PWM technology, can obtain desirable phase voltage waveform, can be rated as perfect harmony through stack.Input power factor can reach more than 0.95, and input filter and power factor compensation device needn't be set, and has further reduced system cost.The improvement of waveform can also reduce noise and dv/dt value except that reducing output harmonic wave.
4. because each power cell of fundamental current compensating unit harmonic current compensation unit has identical structure and parameter; Be convenient to power cell is made modularization; Realize Redundancy Design; Even when the individual elements fault, also can further improve the reliability row of sensitive load system power supply through the unit bypass function with this unit short circuit.
Description of drawings
Fig. 1 is the main circuit diagram of the electric current quality regulator of the utility model;
Fig. 2 is the control unit circuit figure of the electric current quality regulator of the utility model.
The label of each parts in more than scheming: 100-three phase mains, multipleization of 200-cascade IGBT power model, 20h harmonic current compensation unit; 201～20n-fundamental current compensating unit, 300-digital signal processor, 310-AD transducer; The 320-PWM output port, 400-signal condition element, 410-current/voltage-converted element; The 500-NIU, 700-IGBT drive circuit, 900-sensitive loads.
Embodiment
In order to understand the technique scheme of the utility model better, be explained in further detail below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the main circuit diagram of the electric current quality regulator of the utility model; Comprise current regulating module 200 and detect the control module (not shown); Current regulating module 200 is parallel-connected on the three-phase system power supply 100 with sensitive loads 900; The detection input of described detection control module is connected to three-phase system power supply 100, and the control output end of described detection control module is connected to current regulating module 200.The multipleization cascade IGBT power model that current regulating module 200 connects for the Y type, each comprises n the fundamental current compensating unit 201～20n that is connected in series, wherein 1≤n≤20 mutually.
The main circuit of fundamental current compensating unit 201～20n is the H bridge power unit circuit that IGBT connects to form; The AC side of each H bridge power unit circuit of same phase is connected successively; One end is connected to the common point N that the Y type connects; Other end X is connected on the three-phase system power supply 100 that is connected to sensitive loads 900 with after the first inductance component L f connects.
In the embodiment shown in fig. 1, current regulating module 200 also is provided with harmonic current compensation unit 20h; The main circuit of harmonic current compensation unit 20h is the H bridge power unit circuit that IGBT connects to form; Harmonic current compensation unit 20h is parallel-connected to the two ends of the first inductance component L f with after the second inductance component L h connects.
Only represented the phase in multipleization of the three-phase cascade IGBT power model among Fig. 1, the circuit structure of other two phases is identical.Among the figure; The main circuit of fundamental current compensating unit 201～20n harmonic current compensation unit 20h is identical; All be the H bridge power unit circuit that insulated gate bipolar transistor (IGBT) connects to form, each power cell 201～20n and 20h are made up of IGBT (T1 to T4).Harmonic current compensation unit 20h is a high-frequency model, produce with system power in the identical electric current of high-frequency harmonic electric current, injected system side, the each harmonic component in the bucking-out system electric current; Fundamental current compensating unit 201～20n is composed in series fundamental module; Produce with system power in the fundamental wave reactive power electric current identical with negative-sequence current; The injected system side, the idle and negative-sequence current component in the bucking-out system electric current, thus look in system side; The system power power factor is near 1, and the current harmonics aberration rate is less than required value.
According to experiment test, system under test (SUT) all contains bigger harmonic wave and idle component before and after the load current sudden change, the total harmonic distortion THD=13.33% before the compensation.After inserting the electric current quality regulator of the utility model; When load was undergone mutation, device is follow load current waveform (less than 5ms) fast, and the system power after the compensation is three-phase symmetrical sine ripple basically; Harmonic content reduces greatly; System power THD is 2.35% before the sudden load change, and sudden change back system power THD is 2.25%, system power after the compensation and voltage same-phase.
The detection control module of the electric current quality regulator of the utility model comprises digital signal processor 300, signal condition element 400, current/voltage-converted element 410 and NIU 500; Digital signal processor 300 is provided with AD converter 310 and PWM output port 320; The input end of analog signal of AD converter 310; Be connected to three-phase system power source voltage instrument transformer summation current transformer through signal condition element 400 and current/voltage-converted element 410, receive supply voltage and current detection signal; PWM output port 320 is through IGBT drive circuit 700; Be connected respectively to the grid of the IGBT (T1 to T4) of each harmonic current compensation unit, roadbed ripple current compensation unit, send the pwm control signal of digital signal processor 300 generations to each power cell of multipleization cascade; Digital signal processor 300 is connected to the grid monitoring system of three-phase system power supply through NIU 500, realizes remote monitoring and networking control.
In an embodiment of the utility model; Digital signal processor 300 is the TMS320F28335 type digital signal processor of TI company, and this processor has the high speed processing ability of 150MHz, possesses 32 floating point processing units; 6 DMA passages are supported ADC, McBSP and EMIF; Nearly 18 tunnel PWM output is arranged, wherein have 6 the tunnel to be the distinctive more high-precision PWM output of TI (HRPWM), 12 16 passage ADC.IGBT drive circuit 700 can use any existing IGBT drive integrated circult, and typical embodiment is the EXB840 of EXB8 series, EXB841, EXB850; EXB851, the M57957 of M579 series, M57958; M57962, the HL402 of HL series, the GH-039 of GH series etc.In this embodiment; NIU 500 adopts the EtherCAT network interface, and EtherCAT is a real-time and opening Ethernet communications protocol, can satisfy the continuous expansion of electric power system scale; System operation mode becomes increasingly complex, to the increasingly high requirement that requires of automatization level.
28335 produce 8 road PWM ripples, see off through IGBT drive circuit 700.On the integrated circuit board with all input fault signal phases " or " give 6 the tunnel and block PWM input signals (TZ), 28335 can directly block all PWM in case guarantee to break down from hardware.
The channel attached signal condition element 400 of analog acquisition comprises with current/voltage-converted element 410: two-way voltage Hall element (CHV-50P/1200A) input; The input of 2 road current Hall elements; 4 road thermistors sampling input, AD converter adopts 28335 inner 12bitAD.
The digital input signals that 4 road DI input terminals that DIDO connects connect comprises: rectifier bridge left side brachium pontis fault, right brachium pontis fault, inverter bridge left side brachium pontis fault, right brachium pontis fault, drive plate line under-voltage fault; The digital output signal of DO output comprises: 8 road pwm signals, block by-passing signal and drive plate reset signal.
Those of ordinary skill in the art will be appreciated that; Above embodiment only is the technical scheme that is used for explaining the utility model; And be not the qualification that is used as the utility model; Any connotation based on the utility model is to variation, modification that the above embodiment did, all will drop in the protection range of claim of the utility model.
Claims (4)
1. electric current quality regulator; Comprise current regulating module and detect control module; Described current regulating module and sensitive loads are parallel-connected on the three-phase system power supply, and the detection input of described detection control module is connected to the three-phase system power supply, the control output end of described detection control module; Be connected to current regulating module, it is characterized in that:
The multipleization cascade IGBT power model that described current regulating module connects for the Y type, each comprises n the fundamental current compensating unit that is connected in series, wherein 1≤n≤20 mutually;
The main circuit of described fundamental current compensating unit is the H bridge power unit circuit that IGBT connects to form; The AC side of each H bridge power unit circuit of same phase is connected successively; One end is connected to the common point that the Y type connects; The other end is connected on the three-phase system power supply that is connected to sensitive loads with after first inductance element is connected.
2. electric current quality regulator according to claim 1 is characterized in that described current regulating module also is provided with the harmonic current compensation unit; The main circuit of described harmonic current compensation unit is the H bridge power unit circuit that IGBT connects to form; Described harmonic current compensation unit is parallel-connected to the two ends of first inductance element with after second inductance element is connected.
3. electric current quality regulator according to claim 1 and 2 is characterized in that described detection control module comprises digital signal processor, signal condition element and current/voltage-converted element; Described digital signal processor is provided with AD converter and PWM output port, and the input end of analog signal of said AD converter is connected to three-phase system power source voltage instrument transformer summation current transformer through signal condition element and current/voltage-converted element; Said PWM output port is connected respectively to the grid of the IGBT of each harmonic current compensation unit, roadbed ripple current compensation unit through the IGBT drive circuit.
4. electric current quality regulator according to claim 3 is characterized in that described detection control module also comprises NIU, and described digital signal processor is connected to the grid monitoring system of three-phase system power supply through NIU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201352447U CN202550535U (en) | 2012-04-01 | 2012-04-01 | Current quality adjustment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201352447U CN202550535U (en) | 2012-04-01 | 2012-04-01 | Current quality adjustment device |
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| CN202550535U true CN202550535U (en) | 2012-11-21 |
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| CN2012201352447U Expired - Lifetime CN202550535U (en) | 2012-04-01 | 2012-04-01 | Current quality adjustment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529347A (en) * | 2013-10-14 | 2014-01-22 | 东南大学 | Cascade inverter H-bridge unit fault detecting method based on harmonic analysis |
-
2012
- 2012-04-01 CN CN2012201352447U patent/CN202550535U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529347A (en) * | 2013-10-14 | 2014-01-22 | 东南大学 | Cascade inverter H-bridge unit fault detecting method based on harmonic analysis |
| CN103529347B (en) * | 2013-10-14 | 2015-11-11 | 东南大学 | A kind of cascade inverter H-bridge unit fault detection method based on frequency analysis |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121121 |