CN202856353U - Software-embedded active filtering apparatus capable of rapidly responding - Google Patents

Abstract

The utility model discloses a software-embedded active filtering apparatus capable of rapidly responding, which belongs to the filtering technical field. A structure of the active filtering apparatus is composed of a main control display unit, a main circuit module, a converter module, an output electric reactor, an output filtering circuit, a control circuit module, a control system, a shell, a zero line bank, a non-linear load and the like, wherein the main circuit module, the converter module, the output electric reactor and the output filtering circuit are connected through cables, the main control display unit and the control circuit module are connected through a network control cable; and the non-linear load is connected to the other end of a three-phase power grid through a cable, the shell is composed of a small fluorescent lamp, an axial-flow blower fan and a stroke switch. By monitoring the real-time harmonic condition of the power grid, calculating contained harmonic components on line, generating a corresponding control signal, and injecting harmonic current with equal magnitude and opposite directions into the power grid, harmonic waves can be quickly and effectively filtered for 2 to 50 times; and the filtering rate can reach 97%.

Description

The active filter of the embedded quick response of software

Technical field

The utility model relates to a kind of active filter, relates in particular to a kind of active filter that is applied to the embedded quick response of software in the electric power power quality controlling technical field.

Background technology

Development along with China's economic level, the increasing use such as nonlinear loads such as frequency converter, high frequency electric sources produces a large amount of mains by harmonics in electric power system, have a strong impact on power grid quality, strengthen for electric energy consumption, active filter provides the device of power supply for needs, its application can overcome that traditional harmonic wave such as LC filter suppresses and the shortcoming of reactive-load compensation method, traditional can only fixed compensation, realize dynamic tracking compensation, and can not only mend harmonic wave but also mend idle; Theory of Instantaneous Reactive Power of Three-Phase Circuits is that the main foundation of APF development is theoretical; APF has two kinds of parallel connection type and tandem types, the former usefulness many; Active filter in parallel mainly is to administer current harmonics, and the series active filter mainly is to administer the problem that voltage harmonic etc. causes.Active filter compares with active filter, and regulation effect is good, and mainly simultaneously filtering repeatedly reach high order harmonic component, can not cause resonance, and active filter is widely used in the fields such as electric power, railway, metallurgy, chemical industry, coal, shipbuilding.

Current, the harmonic device on the market mostly is greatly passive filtration unit, and there is following shortcoming in passive filtration unit: (1), easy and electrical network generation parallel resonance have a strong impact on the safe operation of electrical network; (2), the operating efficiency of device is not high, only can filtering most of filtering can not provide the harmonic wave control effect of quality; (3), filter capacitor easily decays, and causes the filter branch off resonance, loses the effect of filtering; (4), the life-span is not long, the best passive filtering life-span is 3～4 years, after device was scrapped, electric capacity polluted the environment; (5), passive filtering can not use in the high occasion of power factor because when filtering, must compensating reactive power, the limitation that this has just caused passive filtering to be used; (6), passive filtering can only eliminate the harmonic wave of fixed number of times, if the harmonic number that contains in the electrical network is many, the way that increases branch road can be a lot, cause high cost; (7), passive filtering can not eliminate filtering dynamically, well balance is idle; (8), passive filtering is subjected to the impact of temperature very large, affects the filter effect of device.

Summary of the invention

In order to solve deficiency of the prior art, the utility model provides the active filter of the embedded quick response of a kind of software, can be rapidly, filtering harmonic wave effectively, efficient height, filtering 2～50 subharmonic effectively, rejection rate can reach 97%, response time＜8ms, degree of protection is IP40, reduce equipment loss, satisfy national standard, have high controllability and fast-response, and be not subjected to the impact of system impedance, can eliminate the danger with system impedance generation resonance.

The utility model is to realize by following technical scheme:

The active filter of the embedded quick response of software, its structure is mainly by the master control display unit, main circuit module, converter module, out put reactor, the output filtering loop, the control circuit module, control system, shell, zero line row, the formations such as nonlinear load, main circuit module wherein, converter module, out put reactor, connect by cable between the output filtering loop, the master control display unit, the control circuit intermodule connects by the network control cable, zero line row be fixed on the crossbeam of enclosure, all zero lines all are fixed on the zero line row, nonlinear load is connected in the other end of three phase network by cable, shell is by little fluorescent lamp, axial flow blower, travel switch consists of, little fluorescent lamp wherein, axial flow blower, travel switch all is fixed on the inwall of shell, and little fluorescent lamp is arranged at the upper top of the inside of shell.

Described main circuit module, its structure is made of: main circuit breaker, A.C. contactor, pre-charge resistance, fast acting fuse, electric power incoming line terminal, wherein main circuit breaker, A.C. contactor and fast acting fuse pass through cable series connection, pre-charge resistance is in parallel with A.C. contactor by cable, electric power incoming line terminal one end is connected with the upper end of main circuit breaker, another section reserved location.

Described converter module, its structure is by the IPM module, IPM module trigger board, radiator, dc bus capacitor device group, precharge switching loop, the capacitor discharge loop, output current transformer forms, wherein IPM module trigger board is screwed on the IPM module, the IPM module is screwed on radiator, the IPM module, dc bus capacitor device group, precharge switching loop, to connect by cable between the capacitor discharge loop, output current transformer is punching, directly be enclosed within on the bus, the secondary terminals sampled signal is connected with operation board in the control circuit module, converter module is the part of most critical in the complete machine work, has played the effect of active inversion and systems exchange energy.

Described out put reactor, its end of incoming cables is connected with fast acting fuse in the main circuit module by cable, leading-out terminal is connected with IPM module in the converter module by cable, mainly play the energy exchange effect with system, parameters has directly determined service behaviour, is that converter module energy output current is to the important interface unit of system.

Described output filtering loop, its structure is made of High frequency filter circuit breaker, High frequency filter resistance, HF filtering capacitor, connect successively by cable between High frequency filter circuit breaker, High frequency filter resistance, the HF filtering capacitor, High frequency filter circuit breaker end of incoming cables is connected in the leading-out terminal of the main circuit breaker in the main circuit module by cable.

Described control circuit module, its structure is by master control borad, operation board, DC power supplier, trigger board, the master control display unit, midget relay, the 1P miniature circuit breaker, the secondary fuse, the 3P miniature circuit breaker, control transformer consists of, wherein master control borad is embedded in the master control display unit, master control borad, operation board, DC power supplier, trigger board, the master control display unit interconnects by the network control cable, midget relay is connected by cable with the 1P miniature circuit breaker, the 3P miniature circuit breaker is arranged at the lower end of secondary fuse, the secondary fuse is set to three, two pins are connected to respectively on the pin of control transformer and 3P miniature circuit breaker about each, human-computer interface device is connected with the HRT-SP control module, the control circuit module is to the integral body control of HRT-SP control module work, the HRT-SP control module is to inject offset current with the harmonic current opposite sign but equal magnitude by the equipment coupling part of being incorporated into the power networks, and current harmonics is compensated.

Described operation board, its inner embedding has software, and its workflow is: at first system is carried out initialization, normal with the init state that guarantees high speed digital signal processor (DSP) and all peripheral hardwares; Then system enters into the main program circulation, and system carries out first fault self-checking, if fault is arranged, carries out troubleshooting, guarantees system safety, reliably operation; If system's fault-free occurs, then wait for the generation that the synchronized sampling control signal is interrupted, system enters into corresponding interrupt service routine and carries out frequency detecting and A/D conversion etc.; Then carry out DC voltage control, instruction current calculating, soft start control etc., if start-up course, then adopt soft starting mode, otherwise directly export pwm control signal, finished the control to a sampling period this moment, then program is returned, and the loop control of next time sampling can realize the loop control to system.

Described HRT-SP control module, it is made of core control system and hardware circuit, wherein core control system is comprised of high-performance 32-bit fixed DSP TMS320LF2812 chip, piece of CPLD EPM7256AE chip and peripheral circuit, has adopted the digitization system take DSP+CPLD as core; Its hardware circuit is comprised of data acquisition circuit, sync detection circuit, PWM isolated drive circuit, hardware protection circuit, I/O interface circuit, telecommunication circuit, power supply etc.; control system real-time that can implement device and the requirement of accuracy have directly determined performance index and the compensation effect of device.

Described data acquisition circuit, it mainly is responsible for voltage, the processing of the analog signal conversion such as electric current, because detected electric current and voltage numerical quantity is larger, numerical value far surpasses the input reference signal that DSP allows, need to reduce these analog electrical signals, and the magnitude of current is transformed to voltage, bipolar signal becomes unipolar signal, the line level of going forward side by side coupling, send into DSP after the A/D conversion and carry out computing, its implementation is: voltage, current signal (comprises 2 DC bus-bar voltage, 3 load currents and 3 compensator output currents) after the conversion of current mode Hall element, form voltage signal proportional to original signal at sampling with high precision resistance, again through filtering, isolation, after the level translation, obtain 0～3V analog input voltage, process finally by entering in the DSP after 12 A/D conversion.

Described sync detection circuit, its major function is to produce and the line voltage frequency, the synchronous working pulse signal that phase place is identical and the A/D of 256 times of electrical network fundamental frequencies adopt enabling signal synchronously, because the frequency of electrical network always fluctuates up and down at 50Hz, therefore for guaranteeing the accuracy of electrical network parameter calculating, in measuring process, need the variation of Tracking Frequency of Power Grids, revise at any time the sampling period of A/D, constant to guarantee sampling rate, sync detection circuit essence is a zero passage voltage comparator, one phase power supply ac input signal is transformed into square-wave signal, realize the phase-detection of three-phase mains voltage, utilize the saltus step of square-wave signal to trigger DSP generation interruption, change the moment in order to calculate the A/D of mains frequency and control DSP.

Described PWM isolated drive circuit; it is converted to electric drive pulse signal with the optical drive pulse signal that the HRT-SP control module produces; after processing through power amplification simultaneously; final output 6 road pwm signals; realization is to the driving control of inverter main circuit IGBT; when the fault such as overcurrent, short circuit occurring when device, block immediately the driving pulse of IGBT, and send guard signal to core control system.

Described hardware protection circuit; it has guaranteed to install reliable and stable work; when compensation arrangement is short-circuited, when overcurrent, overvoltage, overtemperature, the fault such as under-voltage; after fault-signal is processed through failure detector circuit; block immediately the PWM drive pulse signal; and the processing such as report to the police, whole apparatus system is automatically out of service, with protection system safety.

Described master control borad, it is comprised of a master control display unit, an operation board, three trigger board.

Described dc bus capacitor device group is made of individual direct current capacitor, and ceramic resistor is parallel to the two ends of dc bus capacitor device group.

Workflow of the present utility model is: the current signal (CT signal) and the voltage signal (PT signal) that gather distribution system by sampling unit, detected the voltage and current signal of target compensation by instrument transformer, real-time current and voltage signal are sent to the MICROCOMPUTER PROCESSING center of ordering calculation plate, then give the command signal that control system calculates offset current through after the conversion process, the first energy storage before system's operation of DC power supply part is boosted, after energy storage is complete signal (DC signal) is fed back to the MICROCOMPUTER PROCESSING center of ordering calculation plate, by comparison and computing, the ordering calculation buttress sends triggering command for the trigger board of inverter according to the harmonic content in the distribution system and size, it is identical with harmonic current size in the distribution system that inverter will produce, the inverter current of opposite direction is transported in the distribution system, with the harmonic wave in the distribution system, idle, the deleterious current components such as negative phase-sequence are offset, the grid side three-phase current is the symmetrical sine ripple, neutral line current is 0, realize administering harmonic wave, improve the purpose of the quality of power supply, finally obtain the mains current feedback loop of expecting.

The utility model is a kind of new harmonic abatement equipment of dynamic filtering harmonic wave, it is by monitoring electrical network real-time harmonic situation, online calculate contained harmonic component, produce corresponding control signal, the control inverter circuit, the harmonic current injection of equal and opposite in direction, opposite direction in electrical network, is reached the effect of promptly dynamically following the tracks of the filtering harmonic wave.

Owing to having adopted above technical scheme, the beneficial effect that the utlity model has is:

1, can be rapidly, filtering harmonic wave effectively, efficient is high, filtering 2～50 subharmonic effectively, rejection rate can reach 97%;

2, not only can filtering but also can carry out reactive power compensation, the rated capacity compensation of shoving be can be higher than moment, thereby flickering and voltage fluctuation eliminated;

3 and can judge voluntarily by equipment and obtain the optimum filtering effect, and can automatically adapt to the impedance variation of electrical network;

4, can change by the real-time tracking mains by harmonics, have high controllability and fast-response, compensation performance is not subjected to the mains frequency influence of fluctuations, and the special filtering characteristic of filtering is not subjected to the impact of system impedance, can eliminate the danger with system impedance generation resonance;

5, Chinese and English, graphic lcd show the clear close friend of man-machine interface;

6, have perfect self diagnosis and function for monitoring, can specifically locate fault, convenient debugging;

7, response time＜8ms, degree of protection IP40 reduces equipment loss, satisfies national standard, has high controllability and fast-response.

8, have the advantages such as reasonable in design, function admirable, have good market popularization value.

Description of drawings

Fig. 1, be front of the present utility model sectional structure schematic diagram;

Fig. 2, be back of the present utility model sectional structure schematic diagram;

Fig. 3, be the instruction flow chart of software in the utility model operation board;

Fig. 4, be the structured flowchart of the HRT-SP control module in the utility model;

Fig. 5, be the circuit diagram of HRT-SP control module in the utility model;

Fig. 6, be the schematic diagram of workflow of the present utility model;

Fig. 7 a, for not using harmonic wave control oscillogram of the present utility model in certain hospital;

Fig. 7 b, be to use harmonic wave control oscillogram of the present utility model in certain hospital;

Fig. 8 c, for not using harmonic wave control current waveform figure of the present utility model in certain Foundry Works;

Fig. 8 d, be to use harmonic wave control current waveform figure of the present utility model in certain Foundry Works;

Fig. 8 e, for not using harmonic wave control spectrum analysis figure of the present utility model in certain Foundry Works;

Fig. 8 f, be to use harmonic wave control spectrum analysis figure of the present utility model in certain Foundry Works.

In Fig. 1～2: the 1-shell, the little fluorescent lamp of 2-, the 3-axial flow blower, the 4-travel switch, the 5-ceramic resistor, 6-dc bus capacitor device group, 7-IPM module trigger board, the 8-IPM module, the 9-radiator, the 10-current transformer, the 11-A.C. contactor, the 12-fast acting fuse, 13-High frequency filter circuit breaker, the 14-main circuit breaker, the 15-out put reactor, 16-electric power incoming line terminal, the 17-midget relay, the 18-1P miniature circuit breaker, 19-secondary fuse, the 20-3P miniature circuit breaker, the 21-control transformer, the 22-DC power supplier, the 23-operation board, 24-High frequency filter resistance, the 25-pre-charge resistance, 26-direct-current discharge resistance, 27-zero line row, the 28-HF filtering capacitor; 29-capacitor discharge loop; The 31-HRT-SP control module; The 32-human-computer interface device; The 33-nonlinear load; 34-master control display unit; 35-stops indicator light; The 36-stop button; The 37-relay indicating light; The 38-start button.

Embodiment

Below in conjunction with drawings and Examples structure of the present utility model and the course of work are described further:

Shown in Fig. 1～2, the active filter of the embedded quick response of software, its structure is mainly by master control display unit 34, main circuit module, converter module, out put reactor 15, the output filtering loop, the control circuit module, control system, shell 1, zero line row 27, nonlinear load 33 parts such as grade consist of, main circuit module wherein, converter module, out put reactor 15, connect by cable between the output filtering loop, master control display unit 34, the control circuit intermodule connects by the network control cable, zero line row 27 is fixed on the crossbeam of shell 1 inside, all zero lines all are fixed on the zero line row 27, nonlinear load 33 is connected in the other end of three phase network by cable, shell 1 is by little fluorescent lamp 2, axial flow blower 3, travel switch 4 consists of, little fluorescent lamp 2 wherein, axial flow blower 3, travel switch 4 all is fixed on the inwall of shell 1, and little fluorescent lamp 2 is arranged at the upper top of the inside of shell 1.

Described main circuit module, its structure is made of: main circuit breaker 14, A.C. contactor 11, pre-charge resistance 25, fast acting fuse 12, electric power incoming line terminal 16, wherein main circuit breaker 14, A.C. contactor 11 and fast acting fuse 12 pass through cable series connection, pre-charge resistance 25 is in parallel with A.C. contactor 11 by cable, electric power incoming line terminal 16 1 ends are connected another section reserved location with the upper end of main circuit breaker 14.

Described converter module, its structure is by IPM module 8, IPM module trigger board 7, radiator 9, dc bus capacitor device group 6, precharge switching loop, capacitor discharge loop 29, output current transformer 10 forms, wherein IPM module trigger board 7 is screwed on the IPM module 8, the IPM module is fixed on the radiator 9 with 8 screws, IPM module 8, dc bus capacitor device group 6, precharge switching loop, 29 in capacitor discharge loop is to connect by cable, output current transformer 10 is punching, directly be enclosed within on the bus, the secondary terminals sampled signal is connected with operation board 23 in the control circuit module, converter module is the part of most critical in the complete machine work, has played the effect of active inversion and systems exchange energy.

Described out put reactor 15, its end of incoming cables is connected with fast acting fuse 12 in the main circuit module by cable, leading-out terminal is connected with IPM module 8 in the converter module by cable, mainly play the energy exchange effect with system, parameters has directly determined service behaviour, is that converter module energy output current is to the important interface unit of system.

Described output filtering loop, it is comprised of High frequency filter circuit breaker 13, High frequency filter resistance 24, HF filtering capacitor 28, connect successively by cable between High frequency filter circuit breaker 13, High frequency filter resistance 24, the HF filtering capacitor 28, High frequency filter circuit breaker 13 ends of incoming cables are connected to the leading-out terminal of the main circuit breaker 14 in the main circuit module by cable.

Described control circuit module, its structure is by master control borad, operation board 23, DC power supplier 22, trigger board, master control display unit 34, midget relay 17,1P miniature circuit breaker 18, secondary fuse 19,3P miniature circuit breaker 20, control transformer 21 consists of, wherein master control borad is embedded in the master control display unit 34, master control borad, operation board 23, DC power supplier 22, trigger board, master control display unit 34 interconnects by the network control cable, midget relay 17 and 1P miniature circuit breaker 18 are connected by cable, 3P miniature circuit breaker 20 is arranged at the lower end of secondary fuse 19, secondary fuse 19 is set to three, two pins are connected to respectively on the pin of control transformer 21 and 3P miniature circuit breaker 20 about each, human-computer interface device 32 is connected connection with the HRT-SP control module, the control circuit module is to the integral body control of HRT-SP control module 31 work, HRT-SP control module 31 is to inject offset current with the harmonic current opposite sign but equal magnitude by the equipment coupling part of being incorporated into the power networks, and current harmonics is compensated.

Shown in Fig. 3～5, described operation board 23, its inner embedding has software, and its workflow is: at first system is carried out initialization, normal with the init state that guarantees high speed digital signal processor (DSP) and all peripheral hardwares; Then system enters into the main program circulation, and system carries out first fault self-checking, if fault is arranged, carries out troubleshooting, guarantees system safety, reliably operation; If system's fault-free occurs, then wait for the generation that the synchronized sampling control signal is interrupted, system enters into corresponding interrupt service routine and carries out frequency detecting and A/D conversion etc.; Then carry out DC voltage control, instruction current calculating, soft start control etc., if start-up course, then adopt soft starting mode, otherwise directly export pwm control signal, finished the control to a sampling period this moment, then program is returned, and the loop control of next time sampling can realize the loop control to system.

Described HRT-SP control module 31, it is made of core control system and hardware circuit, wherein core control system is comprised of high-performance 32-bit fixed DSP TMS320LF2812 chip, piece of CPLD EPM7256AE chip and peripheral circuit, has adopted the digitization system take DSP+CPLD as core; Its hardware circuit is comprised of data acquisition circuit, sync detection circuit, PWM isolated drive circuit, hardware protection circuit, I/O interface circuit, telecommunication circuit, power supply etc.; control system real-time that can implement device and the requirement of accuracy have directly determined performance index and the compensation effect of device.

Described data acquisition circuit, it mainly is responsible for voltage, the processing of the analog signal conversion such as electric current, because detected electric current and voltage numerical quantity is larger, numerical value far surpasses the input reference signal that DSP allows, need to reduce these analog electrical signals, and the magnitude of current is transformed to voltage, bipolar signal becomes unipolar signal, the line level of going forward side by side coupling, send into DSP after the A/D conversion and carry out computing, its implementation is: voltage, current signal (comprises 2 DC bus-bar voltage, 3 load currents and 3 compensator output currents) after the conversion of current mode Hall element, form voltage signal proportional to original signal at sampling with high precision resistance, again through filtering, isolation, after the level translation, obtain 0～3V analog input voltage, process finally by entering in the DSP after 12 A/D conversion.

Described sync detection circuit, its major function is to produce and the line voltage frequency, the synchronous working pulse signal that phase place is identical and the A/D of 256 times of electrical network fundamental frequencies adopt enabling signal synchronously, because the frequency of electrical network always fluctuates up and down at 50Hz, therefore for guaranteeing the accuracy of electrical network parameter calculating, in measuring process, need the variation of Tracking Frequency of Power Grids, revise at any time the sampling period of A/D, constant to guarantee sampling rate, sync detection circuit essence is a zero passage voltage comparator, one phase power supply ac input signal is transformed into square-wave signal, realize the phase-detection of three-phase mains voltage, utilize the saltus step of square-wave signal to trigger DSP generation interruption, change the moment in order to calculate the A/D of mains frequency and control DSP.

Described PWM isolated drive circuit; it is converted to electric drive pulse signal with the optical drive pulse signal that HRT-SP control module 31 produces; after processing through power amplification simultaneously; final output 6 road pwm signals; realization is to the driving control of inverter main circuit IGBT; when the fault such as overcurrent, short circuit occurring when device, block immediately the driving pulse of IGBT, and send guard signal to core control system.

Described hardware protection circuit; it has guaranteed to install reliable and stable work; when compensation arrangement is short-circuited, when overcurrent, overvoltage, overtemperature, the fault such as under-voltage; after fault-signal is processed through failure detector circuit; block immediately the PWM drive pulse signal; and the processing such as report to the police, whole apparatus system is automatically out of service, with protection system safety.

Described master control borad, it is comprised of a master control display unit 34, an operation board 23, three trigger board.

Described dc bus capacitor device group 6 is made of 18 direct current capacitors, and ceramic resistor 5 is parallel to the two ends of dc bus capacitor device group 6.

As shown in Figure 6, workflow of the present utility model is: the current signal (CT signal) and the voltage signal (PT signal) that gather distribution system by sampling unit, detected the voltage and current signal of target compensation by instrument transformer, real-time current and voltage signal are sent to the MICROCOMPUTER PROCESSING center of ordering calculation plate 23, then give the command signal that control system calculates offset current through after the conversion process, the first energy storage before system's operation of DC power supply part is boosted, after energy storage is complete signal (DC signal) is fed back to the MICROCOMPUTER PROCESSING center of ordering calculation plate 23, by comparison and computing, ordering calculation plate 23 sends triggering command for the trigger board of inverter according to the harmonic content in the distribution system and size, it is identical with harmonic current size in the distribution system that inverter will produce, the inverter current of opposite direction is transported in the distribution system, with the harmonic wave in the distribution system, idle, the deleterious current components such as negative phase-sequence are offset, the grid side three-phase current is the symmetrical sine ripple, neutral line current is 0, realize administering harmonic wave, improve the purpose of the quality of power supply, finally obtain the mains current feedback loop of expecting.

Shown in Fig. 7 a, 7b, the utility model is applied to the embodiment of certain hospital, in hospital a large amount of large medical equipments, lighting apparatus and UPS etc. are arranged, being in operation produces 3,5,7 a large amount of inferior harmonic waves, and the normal operation of high-accuracy Medical Devices has been disturbed in the distortion that a large amount of harmonic waves produces electric current, be subjected to the impact of harmonic wave, the deadlock phenomenon of computer and losing of storing information often occur, and the utility model is directly connected in the electric power main line of hospital, its processing procedure is:

◆ basic load is accurate Medical Devices, accelerator, electron detection device, fluorescent lamp, LED large-size screen monitors, UPS etc.;

◆ quality of power supply transnormal items is harmonic current;

◆ 157.1 amperes of A phase current effective values, Current harmonic distortion rate are 48.2%; 160.8 amperes of B phase current effective values, Current harmonic distortion rate are 38.3%; 164.2 amperes of C phase current effective values, total current percent harmonic distortion are 35.6%;

Control measures

◆ find according to field working conditions and measurement result, harmonic wave is mainly produced by accurate Medical Devices and lighting apparatus, adopts the utility model device, and compensation capacity is 150A, administers the harmonic current that load produces from motion tracking, and the compensated part reactive power;

Regulation effect

◆ electric current resultant distortion rate is for being down to 3.9%, waveform non-sinusoidal waveform before administering, waveform is sinusoidal wave after administering, as seen after filter drops into, system harmonics has obtained good inhibition, promotes the reliability of electric power system, has eliminated the harm of system harmonics to distribution system, guarantee the normal operation of accurate Medical Devices, improved power factor.

Shown in Fig. 8 c, 8d, 8e, 8f, the utility model is applied to the embodiment of certain Foundry Works, status analysis:

◆ this factory owner will load and be intermediate frequency furnace, and its six pulse-phases rectifier bridge is typical harmonic source;

◆ because the transformer overload operation causes voltage distortion, thereby harmonic wave also increases greatly;

◆ the control of six pulse-phase rectifications so that in the commutation process of thyristor the rate of change of electric current very big, the waveform of whole load presents the right angle rate of change, form factor is relatively poor, harmonic distortion is serious;

◆ only be to cause owing to form factor is relatively poor when power factor can not meet the demands, can not adopt conventional reactive power compensating apparatus to compensate;

◆ when the intermediate frequency furnace oepration at full load, electric current resultant distortion rate is 22.5%, and main harmonic current is followed successively by 5 times, 7 times, and 11 times, 13 times;

◆ 761 amperes of individual event current effective values; Control measures

◆ according to on-site actual situations, at the other active power filter that to be installed in parallel a compensation capacity be 200A of intermediate frequency furnace power distribution cabinet;

Regulation effect

◆ current stabilization in the load running process, 726 amperes of monophase current effective values and are compared current effective value and are obviously reduced before the compensation, thereby reduce electric cost;

◆ when the intermediate frequency furnace oepration at full load, electric current resultant distortion rate is for being down to 5.78%, and the aberration rate of each harmonic all in 1.5%, greatly reduces harmonic content.

The utility model is a kind of new harmonic abatement equipment of dynamic filtering harmonic wave, by monitoring electrical network real-time harmonic situation, online calculate contained harmonic component, produce corresponding control signal, the control inverter circuit, the harmonic current injection of equal and opposite in direction, opposite direction in electrical network, is reached the effect of promptly dynamically following the tracks of the filtering harmonic wave.

[0076]

Claims (7)

1. the active filter of the embedded quick response of software, its structure is mainly by master control display unit [34], main circuit module, converter module, out put reactor [15], the output filtering loop, the control circuit module, control system, shell [1], zero line row [27], nonlinear load [33] consists of, it is characterized in that: main circuit module wherein, converter module, out put reactor [15], connect by cable between the output filtering loop, master control display unit [34], the control circuit intermodule connects by the network control cable, zero line row [27] is fixed on the inner crossbeam of shell [1], all zero lines all are fixed on the zero line row [27], nonlinear load [33] is connected in the other end of three phase network by cable, shell [1] is by little fluorescent lamp [2], axial flow blower [3], travel switch [4] consists of, little fluorescent lamp [2] wherein, axial flow blower [3], travel switch [4] all is fixed on the inwall of shell [1], and little fluorescent lamp [2] is arranged at the upper top of the inside of shell [1].

2. the active filter of the embedded quick response of software as claimed in claim 1, it is characterized in that: described main circuit module, its structure is made of: main circuit breaker [14], A.C. contactor [11], pre-charge resistance [25], fast acting fuse [12], electric power incoming line terminal [16], wherein main circuit breaker [14], A.C. contactor [11] and fast acting fuse [12] pass through cable series connection, pre-charge resistance [25] is in parallel with A.C. contactor [11] by cable, electric power incoming line terminal [16] one ends are connected another section reserved location with the upper end of main circuit breaker [14].

3. the active filter of the embedded quick response of software as claimed in claim 1, it is characterized in that: described out put reactor [15], its end of incoming cables is connected with fast acting fuse [12] in the main circuit module by cable, and leading-out terminal is connected with IPM module [8] in the converter module by cable.

4. the active filter of the embedded quick response of software as claimed in claim 1, it is characterized in that: described output filtering loop, it is comprised of High frequency filter circuit breaker [13], High frequency filter resistance [24], HF filtering capacitor [28], High frequency filter circuit breaker [13], High frequency filter resistance [24], HF filtering capacitor are connected successively by cable between [28], and High frequency filter circuit breaker [13] end of incoming cables is connected to the leading-out terminal of the main circuit breaker [14] in the main circuit module by cable.

5. the active filter of the embedded quick response of software as claimed in claim 1, it is characterized in that: described control circuit module, its structure is by master control borad, operation board [23], DC power supplier [22], trigger board, master control display unit [34], midget relay [17], 1P miniature circuit breaker [18], secondary fuse [19], 3P miniature circuit breaker [20], control transformer [21] consists of, wherein master control borad is embedded in the master control display unit [34], master control borad, operation board [23], DC power supplier [22], trigger board, master control display unit [34] interconnects by the network control cable, midget relay [17] is connected by cable with 1P miniature circuit breaker [18], 3P miniature circuit breaker [20] is arranged at the lower end of secondary fuse [19], secondary fuse [19] is set to three, two pins are connected to respectively on the pin of control transformer [21] and 3P miniature circuit breaker [20] about each, and human-computer interface device [32] is connected 31 with the HRT-SP control module] connect.

6. the active filter of the embedded quick response of software as claimed in claim 5, it is characterized in that: described HRT-SP control module [31], it is made of core control system and hardware circuit, wherein core control system is comprised of high-performance 32-bit fixed DSP TMS320LF2812 chip, piece of CPLD EPM7256AE chip and peripheral circuit, has adopted the digitization system take DSP+CPLD as core; Its hardware circuit is comprised of data acquisition circuit, sync detection circuit, PWM isolated drive circuit, hardware protection circuit, I/O interface circuit, telecommunication circuit, power supply.

7. the active filter of the embedded quick response of software as claimed in claim 5, it is characterized in that: described master control borad, it is comprised of a master control display unit [34], an operation board [23], three trigger board.

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