CN202550547U - Device for regulating quality of comprehensive overcurrent protection current - Google Patents
Device for regulating quality of comprehensive overcurrent protection current Download PDFInfo
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- CN202550547U CN202550547U CN2012201352413U CN201220135241U CN202550547U CN 202550547 U CN202550547 U CN 202550547U CN 2012201352413 U CN2012201352413 U CN 2012201352413U CN 201220135241 U CN201220135241 U CN 201220135241U CN 202550547 U CN202550547 U CN 202550547U
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Abstract
一种综合过流保护电流质量调节装置，涉及一种用于交流干线或交流配电网络的电路装置，尤其是涉及到适用于高压交流电网稳定电压和减少谐波或波纹的装置，包括电流调节模块和检测控制模块，电流调节模块与敏感负载并联连接到三相系统电源上，电流调节模块为Y型连接的多重化级联IGBT功率模块，每相包含n个串联连接的基波电流补偿单元；检测控制模块设置综合过流保护电路，综合过流保护电路的限流保护单元设有两个输入端，一个输入端连接到Uce检测单元，另一输入端通过光耦或光纤隔离连接到过电流检测单元。该装置可以显著提高敏感用户供电电能质量，减少电网和敏感负载用电设备的故障、降低电网损耗、提高电能利用率，提高短路保护电路的可靠性。
A current quality regulating device for integrated overcurrent protection, relating to a circuit device for use in AC mains or AC power distribution networks, in particular to devices suitable for stabilizing voltage and reducing harmonics or ripples in high voltage AC networks, including current regulation Module and detection control module, the current regulation module and the sensitive load are connected in parallel to the three-phase system power supply, the current regulation module is a Y-connected multiple cascaded IGBT power module, and each phase contains n series-connected fundamental wave current compensation units The detection control module is provided with a comprehensive overcurrent protection circuit, and the current limiting protection unit of the comprehensive overcurrent protection circuit is provided with two input terminals, one input terminal is connected to the Uce detection unit, and the other input terminal is connected to the overcurrent protection unit through an optocoupler or optical fiber isolation. current detection unit. The device can significantly improve the power quality of power supply for sensitive users, reduce the failure of the power grid and sensitive load electrical equipment, reduce the loss of the power grid, improve the utilization rate of power energy, and improve the reliability of the short-circuit protection circuit.
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 electric current quality regulator 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 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;
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 electric current quality regulator of the utility model; The main circuit that it is characterized in that 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, and 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 comprehensive overcurrent protection 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 comprehensive overcurrent protection 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 comprehensive overcurrent protection 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 comprehensive overcurrent protection 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.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 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 comprehensive overcurrent protection electric current quality regulator of the utility model;
Fig. 2 is the control unit circuit figure of the comprehensive overcurrent protection electric current quality regulator of the utility model;
Fig. 3 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, 20h harmonic current compensation unit, 201～20n-fundamental current compensating unit; The 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, 610-Uce detecting unit; The 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 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.
Described detection control module is provided with comprehensive current foldback circuit, and comprehensive current foldback circuit is as shown in Figure 3, 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.
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, VRM Voltage Regulator Module 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 comprehensive overcurrent protection 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 comprehensive overcurrent protection 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 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 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012201352413U CN202550547U (en) | 2012-04-01 | 2012-04-01 | Device for regulating quality of comprehensive overcurrent protection current |
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| CN2012201352413U CN202550547U (en) | 2012-04-01 | 2012-04-01 | Device for regulating quality of comprehensive overcurrent protection current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117672A (en) * | 2013-02-07 | 2013-05-22 | 江苏方程电力科技有限公司 | Inverter control circuit applied to electric power system |
| CN107887880A (en) * | 2017-12-13 | 2018-04-06 | 丽水学院 | A kind of Intelligent single-phase electricity consumption identification protecting controller and its control method |
-
2012
- 2012-04-01 CN CN2012201352413U patent/CN202550547U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117672A (en) * | 2013-02-07 | 2013-05-22 | 江苏方程电力科技有限公司 | Inverter control circuit applied to electric power system |
| CN103117672B (en) * | 2013-02-07 | 2015-08-26 | 江苏方程电力科技有限公司 | A kind of inverter control circuit be applied in electric power system |
| CN107887880A (en) * | 2017-12-13 | 2018-04-06 | 丽水学院 | A kind of Intelligent single-phase electricity consumption identification protecting controller and its control method |
| CN107887880B (en) * | 2017-12-13 | 2024-01-30 | 丽水学院 | Intelligent single-phase power consumption identification protection controller and control method thereof |
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Granted publication date: 20121121 |