CN202550549U - Device for regulating quality of comprehensive overcurrent protection voltage - Google Patents
Device for regulating quality of comprehensive overcurrent protection voltage Download PDFInfo
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- CN202550549U CN202550549U CN201220138264XU CN201220138264U CN202550549U CN 202550549 U CN202550549 U CN 202550549U CN 201220138264X U CN201220138264X U CN 201220138264XU CN 201220138264 U CN201220138264 U CN 201220138264U CN 202550549 U CN202550549 U CN 202550549U
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Abstract
The utility model discloses a device for regulating the quality of comprehensive overcurrent protection voltage, and relates to a circuit device for an alternating-current main line or an alternating-current distribution network, in particular to a device which is suitable for the stabilization of the voltage of a high-voltage alternating-current power grid and the reduction of harmonic waves or corrugation. The device comprises voltage regulating modules, controllable rectification modules and a detection control module, wherein the voltage regulating modules are multiplex cascade insulated gate bipolar transistor (IGBT) power modules, and each phase of the modules consists of n pulse-width modulation (PWM) controllable rectification units and n fundamental wave voltage compensation units which are connected in series; the detection control module is provided with a comprehensive overcurrent protection circuit; and a current-limiting protection unit of the comprehensive overcurrent protection circuit is provided with two input ends, one input end is connected to a Uce detection unit, and the other input end is connected to an overcurrent detection unit by an optical coupler or optical fiber isolation. By the device, the quality of powered electric energy of sensitive users can be improved obviously, the faults of the power grid and sensitive load electric equipment are reduced, the loss of the power grid is reduced, the utilization rate of the electric energy is improved, and the reliability of a short circuit protection circuit is improved.
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 comprehensive overcurrent protection quality of voltage adjusting device will be provided; 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 comprehensive overcurrent protection quality of voltage adjusting device; Comprise VRM Voltage Regulator Module, controllable rectifier module and detection control module; Described comprehensive overcurrent protection quality of voltage adjusting device is connected between three-phase system power supply and the sensitive loads, 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 VRM Voltage Regulator Module and controllable rectifier module, it is characterized in that:
Described VRM Voltage Regulator Module is a multipleization cascade IGBT power model, and every fundamental voltage compensating unit that is connected in series by n is formed, wherein 1≤n≤20;
Described detection control module is provided with comprehensive current foldback circuit, and described comprehensive current foldback circuit comprises current-limiting protection unit, Uce detecting unit, excessive current detection unit, current sensor;
The output of described current-limiting protection unit is connected in parallel with the output of IGBT drive circuit, and is connected to the grid of protected IGBT power model;
Described current sensor is connected in the electric current output loop of IGBT power model, and the detection output of current sensor is connected to described excessive current detection unit;
The input of described Uce detecting unit is connected to the collector electrode of IGBT power model;
Described current-limiting protection unit is provided with two inputs, and an input is connected to the Uce detecting unit, and another input is connected to said excessive current detection unit through optocoupler or optical fiber isolation.
A kind of optimized technical scheme of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model is characterized in that described controllable rectifier module comprises n PWM controlled rectification unit, and each PWM controlled rectification unit connects a fundamental voltage compensating unit; The AC side of said PWM controlled rectification unit is connected to the three-phase system power supply through a multi-winding isolation transformer; Said isolating transformer comprises 3n secondary winding, PWM controlled rectification unit of the corresponding connection of each secondary winding; The main circuit of described fundamental voltage compensating unit is the H bridge power unit circuit that IGBT connects to form, and the input of each road H bridge power unit circuit is connected respectively to the DC side of corresponding PWM controlled rectification unit.
A kind of preferable technical scheme of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model; It is characterized in that described VRM Voltage Regulator Module is provided with harmonic voltage compensating unit and the PWM controlled rectification unit corresponding with it, the main circuit of described harmonic voltage compensating unit is the H bridge power unit circuit that IGBT connects to form; Said isolating transformer is provided with the secondary winding into the power supply of harmonic voltage compensating unit; Said secondary winding for the power supply of harmonic voltage compensating unit through the PWM controlled rectification unit of said correspondence, is connected to the input of the H bridge power unit circuit of described harmonic voltage compensating unit; Being connected same harmonic voltage compensating unit of going up mutually of three-phase system power supply and fundamental voltage adjustment module is connected in series.
A kind of better technical scheme of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model; It is characterized in that described comprehensive overcurrent protection quality of voltage adjusting device also is provided with controlled by-pass switch element; Said controlled by-pass switch element is parallelly connected with the output of described VRM Voltage Regulator Module, is connected between three-phase system power supply and the sensitive loads; The control utmost point of said controlled by-pass switch element is connected to described detection control module through optocoupler or light isolation.
A kind of improved technical scheme of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model is characterized in that described detection control module comprises digital signal processor, signal condition element, current/voltage-converted element and NIU; 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 roadbed wave voltage compensating unit harmonic voltage 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.
The beneficial effect of the utility model is:
1. the comprehensive overcurrent protection quality of voltage adjusting device 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.Utilize Uce detecting unit and current sensor senses, protected IGBT power model is realized integrated protection, improved the reliability of short-circuit protection circuit greatly.
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 VRM Voltage Regulator Module and controllable rectifier module has identical structure and parameter; Be convenient to power cell is made modularization; Realize Redundancy Design; Even when the individual elements fault, also can perhaps continue power supply, further improved the reliability row of sensitive load system power supply through the unit bypass function with this unit short circuit through controlled by-pass switch element.
Description of drawings
Fig. 1 is the main circuit diagram of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model;
Fig. 2 is the H bridge element circuit figure of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model;
Fig. 3 is the operation principle block diagram of multipleization cascade IGBT power model;
Fig. 4 is the control unit circuit figure of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model;
Fig. 5 is the theory diagram of comprehensive current foldback circuit.
The label of each parts in more than scheming: 100-three phase mains, multipleization of 200-cascade IGBT power model, 101～10n-PWM controlled rectification unit, 201～20n-H bridge power model; The 210-controllable rectifier module, 300-digital signal processor, 310-AD transducer, 320-PWM output port; 400-signal condition element, 410-current/voltage-converted element, 500-NIU, 600-current-limiting protection unit; The 610-Uce detecting unit, 620-excessive current detection unit, 621-external reference voltage input, 630-current sensor; 640-is soft to switch off control circuit, 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 comprehensive overcurrent protection quality of voltage adjusting device of the utility model; Comprise VRM Voltage Regulator Module 200, controllable rectifier module 210 and detect the control module (not shown); Described comprehensive overcurrent protection quality of voltage adjusting device is connected between three-phase system power supply 100 and the sensitive loads 900; The detection input of described detection control module is connected to three-phase system power supply 100; The control output end of described detection control module is connected to VRM Voltage Regulator Module 200 and controllable rectifier module 210.VRM Voltage Regulator Module 200 is a multipleization cascade IGBT power model, and every fundamental voltage compensating unit 201～20n that is connected in series by n forms wherein 1≤n≤20 (referring to Fig. 2).
Described detection control module is provided with comprehensive current foldback circuit, and comprehensive current foldback circuit is as shown in Figure 5, comprises current-limiting protection unit 600, Uce detecting unit 610, excessive current detection unit 620, current sensor 630; The output of current-limiting protection unit 600 is connected in parallel with the output of IGBT drive circuit 700, and is connected to the grid of protected IGBT power model 200; Current sensor 630 is connected in the electric current output loop of IGBT power model 200, and the detection output of current sensor 630 is connected to excessive current detection unit 620; The input of Uce detecting unit 610 is connected to the collector electrode of IGBT power model 200; Current-limiting protection unit 600 is provided with two inputs, and an input is connected to Uce detecting unit 610, and another input is isolated the output that is connected to current detecting unit 620 through optocoupler or optical fiber.
Fig. 2 is the H bridge element circuit figure of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model, has only represented the phase in multipleization of the three-phase cascade IGBT power model among Fig. 2, and the circuit structure of other two phases is identical.Among the figure; Controllable rectifier module 210 comprises n PWM controlled rectification unit 101～10n; Each PWM controlled rectification unit connects a fundamental voltage compensating unit; Be that controlled rectification unit 101 is connected to fundamental voltage compensating unit 201, controlled rectification unit 102 is connected to fundamental voltage compensating unit 203, and the like; The AC side of PWM controlled rectification unit 101～10n is connected to three-phase system power supply 100 through a multi-winding isolation transformer T10; Said isolating transformer comprises 3n secondary winding, PWM controlled rectification unit of the corresponding connection of each secondary winding.
In the present embodiment; The main circuit of PWM controlled rectification unit 101～10n is identical with the main circuit of fundamental voltage compensating unit 201～20n; It all is the H bridge power unit circuit that insulated gate bipolar transistor (IGBT) connects to form; Each power cell 101～10n or 201～20n are made up of IGBT (T1 to T4), and all PWM controlled rectification unit 101～10n form single-phase electricity die mould PWM controlled rectification; The function that completion is absorbed with function or pours in down a chimney energy to system from system guarantees that the voltage at dc bus capacitor C1～Cn two ends is stable.All fundamental voltage compensating unit 201～20n, the PWM voltage source inverter of the input of composition three-phase, single-phase output.The output voltage of each power cell 201～20n is 1,0 ,-1 three kind of state level, and every phase n unit stack just can produce the different levels of 2n+1 kind.
The input of each road H bridge power unit circuit of fundamental voltage compensating unit 201～20n is connected respectively to the DC side of corresponding PWM controlled rectification unit.
Isolating transformer T10 is a three-phase power transformer, and total 3n secondary winding is divided into the n group, and the difference through isolating transformer between every group connects group, realizes the phase difference (referring to Fig. 3) of 180/3n.Be example with 5 unit cascaded patterns among Fig. 3, connecing method with middle Δ is reference (phase difference is 0), upper and lower respectively have two covers leading respectively (+180/3n ,+360/3n) with hysteresis (180/3n ,-360/3n) 4 groups of windings.Difference through transformer connects group, can realize required difference angle.If the every group of power unit cascade that is 690V by 5 rated voltages, phase voltage is 690V * 5=3450V, and pairing line voltage is 6000V, thereby has realized realizing the function that high tension voltage compensates with the low pressure and low power element.Adopt power unit cascade, rather than connect with traditional device and to realize that high pressure exports, so the problem that does not exist device all to press.The output current that each power cell bears all equals the load phase current, that is, and and I1=I2=...=In; The voltage U i that each power cell bears (i=1-n) is the 1/n of output phase voltage U; Each power cell bears the power output of 1/3n.
Another embodiment according to the comprehensive overcurrent protection quality of voltage adjusting device of the utility model; VRM Voltage Regulator Module 200 is provided with harmonic voltage compensating unit and the PWM controlled rectification unit corresponding with it; The main circuit of the main circuit of described harmonic voltage compensating unit and fundamental voltage compensating unit is identical, all is the H bridge power unit circuit that IGBT connects to form; Isolating transformer T10 is provided with the secondary winding into the power supply of harmonic voltage compensating unit; Said secondary winding for the power supply of harmonic voltage compensating unit through the PWM controlled rectification unit of said correspondence, is connected to the input of the H bridge power unit circuit of described harmonic voltage compensating unit; Be connected after same harmonic voltage compensating unit of going up mutually of three-phase system power supply and fundamental voltage compensating unit be connected in series, through the LC filter circuit that inductance L and capacitor Cx form, series connection inserts between three-phase system power supply 100 and the sensitive loads 900.The filter inductance L of inversion outlet side provides the current-limiting protection function when load-side is short-circuited.
In the embodiment of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model shown in Figure 1; Comprehensive overcurrent protection quality of voltage adjusting device also is provided with controlled by-pass switch element BT; Controlled by-pass switch element BT can adopt the controlled power switching device of bidirectional thyristor or other reverse parallel connections to form; Controlled by-pass switch element BT is parallelly connected with the output of VRM Voltage Regulator Module 200; Just with the LC filter circuit in filter capacitor Cx parallelly connected, be connected between three-phase system power supply 100 and the sensitive loads 900; The control utmost point of said controlled by-pass switch element BT is connected to described detection control module through optocoupler or light isolation.When VRM Voltage Regulator Module 200 broke down, described detection control module was connected controlled by-pass switch element BT when closing VRM Voltage Regulator Module, and three-phase system power supply 100 can continue to sensitive loads 900 power supplies through controlled by-pass switch element BT.
The detection control module of the comprehensive overcurrent protection quality of voltage adjusting device of the utility model is as shown in Figure 4; Comprise 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 roadbed wave voltage compensating unit harmonic voltage 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 EtherCAT from station control ET1100; 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 D0 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 (5)
1. comprehensive overcurrent protection quality of voltage adjusting device; Comprise VRM Voltage Regulator Module, controllable rectifier module and detection control module; Described comprehensive overcurrent protection quality of voltage adjusting device is connected between three-phase system power supply and the sensitive loads, 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 VRM Voltage Regulator Module and controllable rectifier module, it is characterized in that:
Described VRM Voltage Regulator Module is a multipleization cascade IGBT power model, and every fundamental voltage compensating unit that is connected in series by n is formed, wherein 1≤n≤20;
Described detection control module is provided with comprehensive current foldback circuit, and described comprehensive current foldback circuit comprises current-limiting protection unit, Uce detecting unit, excessive current detection unit, current sensor;
The output of described current-limiting protection unit is connected in parallel with the output of IGBT drive circuit, and is connected to the grid of protected IGBT power model;
Described current sensor is connected in the electric current output loop of IGBT power model, and the detection output of current sensor is connected to described excessive current detection unit;
The input of described Uce detecting unit is connected to the collector electrode of IGBT power model;
Described current-limiting protection unit is provided with two inputs, and an input is connected to the Uce detecting unit, and another input is connected to said excessive current detection unit through optocoupler or optical fiber isolation.
2. comprehensive overcurrent protection quality of voltage adjusting device according to claim 1 is characterized in that described controllable rectifier module comprises n PWM controlled rectification unit, and each PWM controlled rectification unit connects a fundamental voltage compensating unit; The AC side of said PWM controlled rectification unit is connected to the three-phase system power supply through a multi-winding isolation transformer; Said isolating transformer comprises 3n secondary winding, PWM controlled rectification unit of the corresponding connection of each secondary winding; The main circuit of described fundamental voltage compensating unit is the H bridge power unit circuit that IGBT connects to form, and the input of each road H bridge power unit circuit is connected respectively to the DC side of corresponding PWM controlled rectification unit.
3. comprehensive overcurrent protection quality of voltage adjusting device according to claim 1; It is characterized in that described VRM Voltage Regulator Module is provided with harmonic voltage compensating unit and the PWM controlled rectification unit corresponding with it, the main circuit of described harmonic voltage compensating unit is the H bridge power unit circuit that IGBT connects to form; Said isolating transformer is provided with the secondary winding into the power supply of harmonic voltage compensating unit; Said secondary winding for the power supply of harmonic voltage compensating unit through the PWM controlled rectification unit of said correspondence, is connected to the input of the H bridge power unit circuit of described harmonic voltage compensating unit; Being connected same harmonic voltage compensating unit of going up mutually of three-phase system power supply and fundamental voltage adjustment module is connected in series.
4. according to claim 1,2 or 3 described comprehensive overcurrent protection quality of voltage adjusting devices; It is characterized in that described comprehensive overcurrent protection quality of voltage adjusting device also is provided with controlled by-pass switch element; Said controlled by-pass switch element is parallelly connected with the output of described VRM Voltage Regulator Module, is connected between three-phase system power supply and the sensitive loads; The control utmost point of said controlled by-pass switch element is connected to described detection control module through optocoupler or light isolation.
5. according to claim 1,2 or 3 described comprehensive overcurrent protection quality of voltage adjusting devices, it is characterized in that described detection control module comprises digital signal processor, signal condition element, current/voltage-converted element and NIU; 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 roadbed wave voltage compensating unit harmonic voltage 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220138264XU CN202550549U (en) | 2012-04-01 | 2012-04-01 | Device for regulating quality of comprehensive overcurrent protection voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220138264XU CN202550549U (en) | 2012-04-01 | 2012-04-01 | Device for regulating quality of comprehensive overcurrent protection voltage |
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| Publication Number | Publication Date |
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| CN202550549U true CN202550549U (en) | 2012-11-21 |
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| CN201220138264XU Expired - Lifetime CN202550549U (en) | 2012-04-01 | 2012-04-01 | Device for regulating quality of comprehensive overcurrent protection voltage |
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| Country | Link |
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2012
- 2012-04-01 CN CN201220138264XU patent/CN202550549U/en not_active Expired - Lifetime
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Granted publication date: 20121121 |