CN209472439U - Low-voltage electric energy quality testing monitoring system - Google Patents

Abstract

The utility model discloses a kind of low-voltage electric energy quality testing monitoring systems, including central controller, power quality analyzer, temperature sensor, smoke sensor device, time monitoring module, alarm module；The utility model uses the monitoring system being made of central controller, power quality analyzer, temperature sensor, smoke sensor device, time monitoring module, alarm module, realize the real time monitoring and alarm to system equipment operating status, module is occurred to three phase harmonic by PWM controller while the harmonic voltage for exporting multi-frequency superposition controls, the independent control of PWM rectification and inversion is reached, reactive compensation signal is provided further through idle simulation source, the accuracy and reliability for ensuring control logic realizes the accurate control of overtone order and amplitude；The system has many advantages, such as strong antijamming capability, operation stability are high, data test is accurate and reliable, the speed of service is fast, work efficiency is high, wiring is simple and operation is convenient, operational process is safe.

Description

Low-voltage electric energy quality testing monitoring system

Technical field

The utility model relates to a kind of monitoring system more particularly to a kind of low-voltage electric energy quality testing monitoring systems.

Background technique

In recent years, with the rapid development of electric power network technique, diversification power demand continues to increase, intermittent distribution energy A large amount of accesses in source, cause the complexity of user side equipment higher and higher, and there are many power quality problems for power supply grid, and Inevitably there is component aging, failure, by adverse circumstances during long-play in power quality detection system equipment Interference causes system equipment failure rate to rise, accuracy of measurement decline, or generates invalid abnormal data, and system equipment is whole Reliability reduces, so that three-phase imbalance problem, mains by harmonics problem also become to get worse.Currently, existing low pressure The shortcomings that Power Quality Detection monitoring system is primarily present is: since Three-phase harmonic source and reactive compensation design are unreasonable, connecing Enter the nonlinear-load of network system, impact load is easy to produce voltage fluctuation flickering, the convex liter of voltage sag and serious The problems such as three-phase imbalance, cannot ensure the accuracy and reliability of control logic, it is difficult to realize the essence of overtone order and amplitude Really control even results in system and event occurs so that low-voltage electric energy quality detecting system equipment is easy to appear abnormal operational conditions The security risks such as barrier, fire and cannot alarm in time；Additionally, there may be design it is many and diverse, parallel extended ability is poor, stable Property is lower, data test accuracy is lower and the problems such as wiring is cumbersome and complicated for operation, operational process is dangerous.

Utility model content

The technical issues of the utility model solves is to overcome the deficiencies of existing technologies, and provides a kind of low-voltage electric energy quality inspection Survey monitoring system, the low-voltage electric energy quality testing monitoring system by central controller, power quality analyzer, temperature sensor, Smoke sensor device, time monitoring module, alarm module composition, realize the real time monitoring and report to system equipment operating status It is alert, module is occurred to three phase harmonic by PWM controller while the harmonic voltage for exporting multi-frequency superposition controls, is reached The independent control of PWM rectification and inversion provides reactive compensation signal further through idle simulation source, further ensures that control is patrolled The accuracy and reliability collected, realizes the accurate control of overtone order and amplitude, reduces the safety in system operation Hidden danger.

In order to solve the above-mentioned technical problem, the utility model is addressed by following technical proposals:

Low-voltage electric energy quality testing monitoring system, including to power supply grid, power grid simulation source, Three-phase harmonic source, idle mould Central controller that the operation in quasi- source, transformer, sample is controlled, the harmonic wave for detecting Three-phase harmonic source will simultaneously be examined The harmonic value measured be transmitted to central controller power quality analyzer, for detection system equipment temperature signal temperature Sensor, for detection system equipment smoke signal smoke sensor device, be monitored for the working condition to system Time monitoring module, the alarm module for alarming system, pass through transformer between Three-phase harmonic source, idle simulation source It is connected in parallel with sample, power grid simulation source is connect with power supply grid, passes through transformation between power grid simulation source and sample Device connection, alarm module connect with host computer, power grid simulation source, Three-phase harmonic source, idle simulation source, transformer, sample, Power quality analyzer, temperature sensor, smoke sensor device, time monitoring module, alarm module are connect with central controller； Idle simulation source is equipped with reacance generator, and reacance generator includes for energy storage and filtering out the first electric of high frequency switching ripple electric current Anti- device provides PWM converter, the driving circuit of reactive compensation signal using three-phase full-controlled bridge topological form, and the first reactor is logical Transformer is crossed to connect with power supply grid, the exchange side of PWM converter is connect with the first reactor, the DC side of PWM converter with Storage capacitor connection, PWM converter are connected to central controller by driving circuit；Alarm module includes for when center control The current value and/or voltage value that device receives exceed threshold value when alert alarm Current Voltage alarm module, Alert is alarmed when time value for receiving when central controller exceeds threshold value time alarm module is used In the temperature value received when central controller exceed threshold value when alert alarm temperature alarming module, be used for When the smokescope that central controller receives exceed threshold value when alert alarm smog alarm module, be used for The harmonic wave alarm module that alert is alarmed when the harmonic value that central controller receives exceeds threshold value, electric current electricity Press alarm module, time alarm module, temperature alarming module, smog alarm module, harmonic wave alarm module and central controller Connection.Wherein, the three-phase alternating current that power grid simulation source is used to convey power supply grid is acquired, and to the three-phase alternating current of acquisition Electricity is powered the simulation of voltage deviation, frequency departure, imbalance of three-phase voltage, voltage fluctuation and flicker, realizes to power supply electricity The simulation of the normal abnormal characteristic of net, to examine sample to the adaptability of power supply grid；Idle simulation source is for mentioning For reactive compensation signal；Three-phase harmonic source is used for output harmonic wave voltage, and Three-phase harmonic source can export three phase harmonic 2 to 50 times height Subharmonic has parallel extended ability, and have strong antijamming capability, operation stability, it can be achieved that more parallel runnings It is high, data test is accurate and reliable, the speed of service is fast, work efficiency is high, wiring is simple and operation is convenient, operational process is safely etc. all More advantages；The setting being connected in parallel between Three-phase harmonic source, idle simulation source by transformer and sample, transformer is to humorous The harmonic voltage of wave producer output carries out voltage transformation and transmits electric energy, improves Three-phase harmonic source and is examining sample pair Adaptability during the compensation ability of power quality；PWM converter is made of insulated gate bipolar transistor, passes through voltage space Vector modulation technique drives insulated gate bipolar transistor to generate compensation current waveform, and storage capacitor is stored by insulated gate bipolar transistor The DC energy that pipe generates；Driving circuit receives the control signal of central controller sending, drives the semiconductor of PWM converter Power device, and also take into account the defencive function to semiconductor power device；Idle simulation source can compensating reactive power, adjusting three-phase Uneven, harmonics restraint avoids the problem of interfering with each other, and the flexible Configuration Online reactive power of energy, has effectively achieved idle The reasonable compensation of power, the system equipment to be mounted in extremely limited space provide safety guarantee.

Preferably, further including first communication module, first communication module connects with central controller, alarm module respectively It connects, warning message is transmitted to by host computer by first communication module.

Preferably, further including the data memory module being connect with central controller, by data memory module to alarm Information is stored, and data memory module can also store low-voltage electric energy quality testing data.

Preferably, data memory module includes the database server and disk array interconnected, database service Device is connect with central controller, and central controller is stored warning message to disk array, host computer by database server Warning message is read from disk array.By by database server and disk array combine the data memory module formed with The technical solution of above-mentioned monitoring system combines, and improves the reliability of power quality detection system, to improve electric energy matter The integrality and accuracy of data are measured, and different monitoring functions can be set according to monitoring demand, is taken using database is stored in The data of business device establish evaluation system, according to the anti-reliability for pushing away low-voltage electric energy quality detecting system of the superiority and inferiority of the quality of data, from And realize the assessment that long-range reliability is carried out to low-voltage electric energy quality detecting system, system reliability can also be diagnosed and be divided Analysis, and system is overhauled and safeguarded accordingly by the historical variations trend of reliability assessment.

Preferably, idle simulation source is equipped with RS485 interface, reacance generator passes through RS485 interface and central controller Connection.

Preferably, transformer is connect by RS485 interface with central controller.

Preferably, Three-phase harmonic source include detection module, for the harmonic oscillator of output harmonic wave voltage, for humorous The PWM controller that the harmonic voltage of wave producer output carries out electric voltage frequency and amplitude is controlled, harmonic oscillator and PWM are controlled Device connection processed, PWM controller are connect with host computer；Harmonic oscillator includes second communication module, relay output module, simulation Measure output module, module occurs for three phase harmonic, the input terminal of detection module connect with power supply grid, the output end of detection module and Host computer connection, host computer by second communication module respectively with the input terminal of relay output module and analog output module Input terminal connection, the output end of the output end of relay output module and analog output module occurs with three phase harmonic respectively Module connection, three phase harmonic occur module and connect with power supply grid.

Preferably, module, which occurs, for three phase harmonic is equipped with sequentially connected pre-filter, harmonic power module, post filtering Device, harmonic power module include for establishing the PWM rectifier of steady dc voltage, DC side storage capacitor, for generating The PWM inverter of given voltage signal, PWM rectifier, DC side storage capacitor, PWM inverter are sequentially connected, pre-filter Output end and the input terminal of PWM rectifier connect, the output end of PWM inverter connect with postfilter, PWM controller it is defeated Outlet is connect with PWM rectifier, PWM inverter respectively；Wherein, by host computer to three-phase current rippled interface, status monitoring Display interface and harmonic wave generate number set interface and are configured, show；Using by pre-filter, harmonic power module, rear filter Wave device combines the three phase harmonic to be formed and module occurs, and module occurs to three phase harmonic by PWM controller and exports a variety of frequencies simultaneously The harmonic voltage of rate superposition is controlled, and has reached the independent control of PWM rectification and inversion, it is ensured that the accuracy of control logic And reliability, realize the accurate control of overtone order and amplitude.

Preferably, PWM controller uses single-chip microcontroller, harmonic oscillator is located in harmonic source cabinet, and single-chip microcontroller is located at harmonic wave In control cabinet, transformer is located in transformer case, power grid simulation source, harmonic source cabinet, harmonic controling cabinet, idle simulation source, transformation Device cabinet is each provided at beside sample, and sample is set on the tester rack, and test is erected on metope, and testing jig is equipped with wiring Frame, patch bay are supported below ceiling by support frame, and support frame fixation is located on metope or ceiling, and patch bay is equipped with line Slot, cable are embedded in wire casing, and power grid simulation source, harmonic controling cabinet, idle simulation source, transformer case, is tested harmonic source cabinet Sample passes through cable and connect with power supply grid.The mounting structure formed is combined by support frame, patch bay, testing jig, both for The installation and wiring of low-voltage electric energy quality testing monitoring system provide higher stability, fixing and balanced capacity, and make The safety compact to design and with higher of low-voltage electric energy quality testing monitoring system is obtained, and is adequately utilized limited The test space.

In the utility model patent, single-chip microcontroller be equipped with dual-port parallel port RAM, dual-port parallel port RAM have data input port, Data output, address input port, address scan mouth, the data input port of dual-port parallel port RAM, address input port are connected to list On piece machine.

In the utility model patent, single-chip microcontroller is connected with the one 8 parallel port analog-digital converter, second for regulation amplitude 8 parallel port analog-digital converters, the data port of the one 8 parallel port analog-digital converter, the data port of the 2nd 8 parallel port analog-digital converter It is connect with single-chip microcontroller, the REF mouth and base of the REF mouth of the one 8 parallel port analog-digital converter, the 2nd 8 parallel port analog-digital converter The output of quasi-mode block connects.

In the utility model patent, single-chip microcontroller is also connected with the 3rd 8 parallel port analog-to-digital conversion for controlling output waveform Device, the 4th 8 parallel port analog-digital converter, the 3rd 8 parallel port analog-digital converter, the 4th 8 parallel port analog-digital converter pass through double The data output of port parallel port RAM is connected to single-chip microcontroller.

In the utility model patent, the delivery outlet of the one 8 parallel port analog-digital converter, the 2nd 8 parallel port analog-digital converter Connect respectively with the first amplifier array, the output end of the first amplifier array respectively with the 3rd 8 parallel port analog-digital converter, the 4th 8 REF mouth of position parallel port analog-digital converter connects, the output of the 3rd 8 parallel port analog-digital converter, the 4th 8 parallel port analog-digital converter End is connect with the second amplifier array respectively, and the output end of the second amplifier array is connect with harmonic oscillator.

In the utility model patent, dual-port is written by data input port and address input port in Wave data by single-chip microcontroller In the RAM of parallel port, waveform table is established, phase shift can be realized in the address difference of write-in.Single-chip microcontroller is respectively by the high by 8 of amplitude signal Position, least-significant byte send the one 8 parallel port analog-digital converter and the 2nd 8 parallel port analog-digital converter to, and the one 8 parallel port modulus turns Parallel operation and the 2nd 8 parallel port analog-digital converter pass to the first amplifier array, the first fortune by base modules calculating output voltage It is cumulative by ratio to put array, output valve is passed into the 3rd 8 parallel port analog-digital converter and the 4th 8 parallel port analog-digital converter REF mouth, to provide the amplitude of output waveform.

In the utility model patent, dual-port parallel port RAM is written in the Wave data of output by single-chip microcontroller, by each moment point Data the 3rd 8 parallel port analog-digital converter and the 4th 8 parallel port analog-digital converter, the 3rd 8 parallel port analog-digital converter is written With the 4th 8 parallel port analog-digital converter by the reference voltage of the REF mouth of itself, output voltage is calculated, sends the second amplifier to Array, to export the waveform phase of needs.

In the utility model patent, pre-filter and postfilter are all made of RLC filtering mode, wherein pre-filter and Postfilter includes the filter inductance interconnected, filter resistance, filter capacitor, and filter inductance is connected in series in PWM rectification On device, filter resistance and filter capacitor are connected in series and are connected in parallel in PWM rectifier again later.

In the utility model patent, it includes that module, B occur for completely identical in structure A phase harmonic wave that module, which occurs, for three phase harmonic Module occurs for phase harmonic wave, module occurs for C phase harmonic wave, and module occurs for A phase harmonic wave, module occurs for B phase harmonic wave, mould occurs for C phase harmonic wave Block is equipped with three phase harmonic and circuit occurs, and it includes state monitor, A.C. contactor, relay, list that circuit, which occurs, for three phase harmonic Harmonic elimination circuit, high pass harmonic elimination circuit, anti-parallel thyristor are adjusted, the input terminal of state monitor is connected by breaker and power supply grid It connects, the output end of state monitor is connected by one end of A.C. contactor and relay contact, the other end of relay contact It is connect with one end of dull harmonic elimination circuit or high pass harmonic elimination circuit, the other end of dull harmonic elimination circuit or high pass harmonic elimination circuit and anti- One end of parallel thyristors connects, and the other end of the anti-parallel thyristor of each branch links together, the touching of anti-parallel thyristor Signalling input terminal is connect with analog output module, and the coil of relay is connect with relay output module, state monitor Communication port connect with second communication module.State monitor is mainly used for realizing the status monitoring of each branch, interlocking function It with the detection of zero cross signal, can guarantee correct actuation and the no-flashy-flow switching of relay and A.C. contactor.

In the utility model patent, dull harmonic elimination circuit includes the first resistor being connected in series, the second reactor, the first electricity Container.

In the utility model patent, high pass harmonic elimination circuit includes second resistance, third reactor, the second capacitor, third Capacitor, formation parallel branch in parallel with third reactor again after third capacitor is connected with second resistance, parallel branch is again It connects with the second capacitor.

In the utility model patent, detection module includes current transformer, analog-digital converter, the input terminal of current transformer It is connect with power supply grid, the output end of current transformer and the input terminal of analog-digital converter connect, the output end of analog-digital converter It is connect with host computer.

The utility model due to use above technical scheme, have significant technical effect: using by central controller, Power quality analyzer, temperature sensor, smoke sensor device, time monitoring module, the monitoring system of alarm module composition, are realized To the real time monitoring and alarm of system equipment operating status, module is occurred to three phase harmonic by PWM controller and is simultaneously exported The harmonic voltage of multi-frequency superposition is controlled, and has reached the independent control of PWM rectification and inversion, further through idle simulation source Reactive compensation signal is provided, further ensures the accuracy and reliability of control logic, realizes overtone order and amplitude Accurate control；The system has that strong antijamming capability, operation stability are high, data test is accurate and reliable, the speed of service is fast, work Many advantages, such as high-efficient, wiring is simply and operation is convenient, operational process is safe.

Detailed description of the invention

Fig. 1 is the functional block diagram of the low-voltage electric energy quality testing monitoring system embodiment of the utility model.

Fig. 2 is the functional block diagram of the reacance generator embodiment of the utility model.

Fig. 3 is the circuit of the reacance generator embodiment being made of the first reactor and PWM converter of the utility model Schematic diagram.

Fig. 4 is that the Three-phase harmonic source of the utility model carries out the functional block diagram of detection embodiment to sample.

Fig. 5 is the schematic block circuit diagram of the Three-phase harmonic source embodiment of the utility model.

Fig. 6 is that the circuit diagram of circuit embodiments occurs for the three phase harmonic of the utility model.

Fig. 7 is that the circuit diagram of module major loop embodiment occurs for the three phase harmonic of the utility model.

Fig. 8 is that the PWM controller of the utility model uses the functional block diagram of single-chip microcontroller embodiment.

Fig. 9 is that the harmonic source cabinet, harmonic controling cabinet, sample of the utility model install the structural schematic diagram of embodiment.

Specific embodiment

The utility model is described in further detail with embodiment with reference to the accompanying drawing.

Low-voltage electric energy quality testing monitoring system, as shown in figs 1-9, including to power supply grid 4, power grid simulation source 3, three-phase Central controller 15 that the operation of harmonic source 5, idle simulation source 32, transformer 2, sample 1 is controlled, for detecting three The harmonic wave of phase harmonic source 5 and the harmonic value that will test are transmitted to the power quality analyzer 14 of central controller 15, for examining The temperature sensor 8 of the temperature signal of examining system equipment, for detection system equipment smoke signal smoke sensor device 9, use The time monitoring module 10 that is monitored in the working condition to system, the alarm module 12 for alarming system, three It is connected in parallel by transformer 2 with sample 1 between phase harmonic source 5, idle simulation source 32, power grid simulation source 3 and power supply electricity Net 4 connects, and is connected between power grid simulation source 3 and sample 1 by transformer 2, and alarm module 12 is connect with host computer 13, Power grid simulation source 3, Three-phase harmonic source 5, idle simulation source 32, transformer 2, sample 1, power quality analyzer 14, temperature Sensor 8, smoke sensor device 9, time monitoring module 10, alarm module 12 are connect with central controller 15；Idle simulation source 32 are equipped with reacance generator 6, and reacance generator 6 includes for energy storage and filtering out the first reactor of high frequency switching ripple electric current 61, PWM converter 62, the driving circuit 64 of reactive compensation signal, the first reactor are provided using three-phase full-controlled bridge topological form 61 are connect by transformer 2 with power supply grid 4, and the exchange side of PWM converter 62 is connect with the first reactor 61, PWM converter 62 DC side is connect with storage capacitor 63, and PWM converter 62 is connected to central controller 15 by driving circuit 64；Alarm mould Block 12 include current value for being received when central controller 15 and/or voltage value beyond threshold value when alert carry out The Current Voltage alarm module 121 of alarm, the time value for receiving when central controller 15 issue alarm when exceeding threshold value Sending when the time alarm module 122 that information is alarmed, the temperature value for receiving when central controller 15 exceed threshold value The temperature alarming module 123 that warning message is alarmed, the smokescope for receiving when central controller 15 exceed threshold value When alert smog alarm module 124, the harmonic value for receiving when central controller 15 alarmed exceed The harmonic wave alarm module 125 that alert is alarmed when threshold value, Current Voltage alarm module 121, time alarm module 122, temperature alarming module 123, smog alarm module 124, harmonic wave alarm module 125 are connect with central controller 15.

Further include first communication module 11 in the present embodiment, first communication module 11 respectively with central controller 15, report Alert module connection, is transmitted to host computer 13 for warning message by first communication module 11.

In the present embodiment, further includes the data memory module 7 being connect with central controller 15, pass through data memory module 7 Warning message is stored.

In the present embodiment, data memory module 7 includes the database server 71 and disk array 72 interconnected, number It is connect according to library server 71 with central controller 15, central controller 15 is stored warning message by database server 71 To disk array 72, host computer 13 reads warning message from disk array 72.

In the present embodiment, idle simulation source 32 is equipped with RS485 interface, and reacance generator 6 passes through RS485 interface and center Controller 15 connects.

In the present embodiment, transformer 2 is connect by RS485 interface with central controller 15.

In the present embodiment, Three-phase harmonic source 5 include detection module 53, for output harmonic wave voltage harmonic oscillator 52, The PWM controller 51 that harmonic voltage for exporting to harmonic oscillator 52 carries out electric voltage frequency and amplitude is controlled, harmonic wave Generator 52 is connect with PWM controller 51, and PWM controller 51 is connect with host computer 13.

In the present embodiment, harmonic oscillator 52 is defeated including second communication module 524, relay output module 522, analog quantity Module 521 occurs for module 523, three phase harmonic out, and the input terminal of detection module 53 is connect with power supply grid 4, detection module 53 Output end is connect with host computer 13, and host computer 13 passes through the input with relay output module 522 respectively of second communication module 524 End is connected with the input terminal of analog output module 523, the output end and analog output module of relay output module 522 523 output end occurs module 521 with three phase harmonic respectively and connect, and three phase harmonic occurs module 521 and connect with power supply grid 4； Three phase harmonic occurs module 521 and is equipped with sequentially connected pre-filter 16, harmonic power module 17, postfilter 18, harmonic wave function Rate module 17 includes for establishing the PWM rectifier 171 of steady dc voltage, DC side storage capacitor, given for generating Voltage signal PWM inverter 173, PWM rectifier 171, DC side storage capacitor 172, PWM inverter 173 be sequentially connected, The output end of pre-filter 16 is connect with the input terminal of PWM rectifier 171, the output end and postfilter 18 of PWM inverter 173 Connection, the output end of PWM controller 51 are connect with PWM rectifier 171, PWM inverter 173 respectively.

In the present embodiment, PWM controller 51 uses single-chip microcontroller 510, and harmonic oscillator 52 is located in harmonic source cabinet 30, monolithic Machine 510 is located in harmonic controling cabinet 31, and transformer 2 is located in transformer case 33, power grid simulation source 3, harmonic source cabinet 30, harmonic wave control Cabinet 31 processed, idle simulation source 32, transformer case 33 are each provided at 1 side of sample, and sample 1 is located on testing jig 27, surveys Examination frame 27 is located on metope, and testing jig 27 is equipped with patch bay 28, and patch bay 28 is supported below ceiling by support frame 29, support The fixation of frame 29 is located on metope or ceiling, and patch bay 28 is equipped with wire casing 280, and cable is embedded in wire casing 280, power grid mould Quasi- source 3, harmonic source cabinet 30, harmonic controling cabinet 31, idle simulation source 32, transformer case 33, sample 1 by cable with Power supply grid 4 connects.

In the present embodiment, single-chip microcontroller is equipped with dual-port parallel port RAM19, and dual-port parallel port RAM19 has data input port, number According to delivery outlet, address input port, address scan mouth, the data input port of dual-port parallel port RAM, address input port are connected to monolithic On machine.

In the present embodiment, single-chip microcontroller is connected with the one 8 parallel port analog-digital converter 24, the 2nd 8 for regulation amplitude The data port of the 26, the 1st parallel port analog-digital converter of parallel port analog-digital converter, the data port of the 2nd 8 parallel port analog-digital converter It is connect with single-chip microcontroller, the REF mouth and base of the REF mouth of the one 8 parallel port analog-digital converter, the 2nd 8 parallel port analog-digital converter The output of quasi-mode block 25 connects.

In the present embodiment, single-chip microcontroller is also connected with the 3rd 8 parallel port analog-digital converter 20 for controlling output waveform, 48 parallel port analog-digital converters the 22, the 3rd 8 parallel port analog-digital converter, the 4th 8 parallel port analog-digital converter pass through dual-port The data output of parallel port RAM is connected to single-chip microcontroller.

In the present embodiment, the one 8 parallel port analog-digital converter, the 2nd 8 parallel port analog-digital converter delivery outlet respectively with First amplifier array 23 connection, the output end of the first amplifier array respectively with the 3rd 8 parallel port analog-digital converter, the 4th 8 simultaneously The REF mouth of mouth mold number converter connects, the output end point of the 3rd 8 parallel port analog-digital converter, the 4th 8 parallel port analog-digital converter It is not connect with the second amplifier array 21, the output end of the second amplifier array is connect with harmonic oscillator.

In the present embodiment, dual-port parallel port is written by data input port and address input port in Wave data by single-chip microcontroller In RAM, waveform table is established, phase shift can be realized in the address difference of write-in.Single-chip microcontroller is respectively by the most-significant byte of amplitude signal, low 8 Position sends the one 8 parallel port analog-digital converter and the 2nd 8 parallel port analog-digital converter to, the one 8 parallel port analog-digital converter and 2nd 8 parallel port analog-digital converter calculates output voltage by base modules, passes to the first amplifier array, the first amplifier array It is cumulative by ratio, output valve is passed to the REF of the 3rd 8 parallel port analog-digital converter and the 4th 8 parallel port analog-digital converter Mouthful, to provide the amplitude of output waveform.

In the present embodiment, dual-port parallel port RAM is written in the Wave data of output by single-chip microcontroller, by the data of each moment point The 3rd 8 parallel port analog-digital converter and the 4th 8 parallel port analog-digital converter, the 3rd 8 parallel port analog-digital converter and the 4th 8 is written Position parallel port analog-digital converter calculates output voltage, sends the second amplifier array to by the reference voltage of the REF mouth of itself, from And export the waveform phase needed.

In the present embodiment, pre-filter and postfilter are all made of RLC filtering mode, wherein pre-filter and post filtering Device includes the filter inductance interconnected, filter resistance, filter capacitor, and filter inductance is connected in series in PWM rectifier, is filtered Wave resistance and filter capacitor are connected in parallel on PWM rectifier again after being connected in series.

In the present embodiment, it includes that module 5211, B occur for completely identical in structure A phase harmonic wave that module 521, which occurs, for three phase harmonic Module 5212 occurs for phase harmonic wave, module 5213 occurs for C phase harmonic wave, and it is humorous that module, B phase harmonic wave generation module, C phase occur for A phase harmonic wave Wave occurs module and is equipped with three phase harmonic generation circuit 5210, and it includes state monitor 52102, exchange that circuit, which occurs, for three phase harmonic Contactor 52103, relay 52104, dull harmonic elimination circuit 52105, high pass harmonic elimination circuit 52107, anti-parallel thyristor 52106, the input terminal of state monitor is connect by breaker 52101 with power supply grid, and the output end of state monitor passes through The connection of one end of A.C. contactor and relay contact, the other end of relay contact and dull harmonic elimination circuit or high pass harmonic elimination electricity The one end on road connects, one end connection of the other end and anti-parallel thyristor of dull harmonic elimination circuit or high pass harmonic elimination circuit, and each The other end of the anti-parallel thyristor on road links together, the trigger signal input terminal and analog output mould of anti-parallel thyristor Block connection, the coil of relay are connect with relay output module, and the communication port and second communication module of state monitor connect It connects.State monitor is mainly used for realizing the detection of the status monitoring, interlock function and zero cross signal of each branch, guarantees relay The correct actuation of device and A.C. contactor and no-flashy-flow switching.

In the present embodiment, dull harmonic elimination circuit 52105 includes the first resistor 521053 being connected in series, the second reactor 521052, first capacitor device 521051.

In the present embodiment, high pass harmonic elimination circuit 52107 includes second resistance 521073, third reactor 521071, second Capacitor 521072, third capacitor 521074, third capacitor are in parallel with third reactor again after connecting with second resistance Parallel branch is formed, parallel branch is connected with the second capacitor again.

In the present embodiment, detection module 53 includes current transformer 531, analog-digital converter 532, the input of current transformer End is connect with power supply grid, and the output end of current transformer and the input terminal of analog-digital converter connect, the output of analog-digital converter End is connect with host computer.

In short, the above is only the preferred embodiment of the present invention, it is all according to present utility model application the scope of the patents institute The equivalent changes and modifications of work should all belong to the covering scope of the utility model patent.

Claims (9)

1. low-voltage electric energy quality testing monitoring system, it is characterised in that: including to power supply grid (4), power grid simulation source (3), three The central controller that the operation of phase harmonic source (5), idle simulation source (32), transformer (2), sample (1) is controlled (15), the harmonic value for detecting the harmonic wave of Three-phase harmonic source (5) and will test is transmitted to the electric energy of central controller (15) Mass-synchrometer (14), for detection system equipment temperature signal temperature sensor (8), for the cigarette of detection system equipment The smoke sensor device (9) of fog signal, the time monitoring module (10) being monitored for the working condition to system, for being The alarm module (12) that system is alarmed, by transformer (2) and tested between Three-phase harmonic source (5), idle simulation source (32) Sample (1) is connected in parallel, and power grid simulation source (3) is connect with power supply grid (4), between power grid simulation source (3) and sample (1) It is connected by transformer (2), alarm module (12) is connect with host computer (13), power grid simulation source (3), Three-phase harmonic source (5), nothing Function simulation source (32), transformer (2), sample (1), power quality analyzer (14), temperature sensor (8), smog sensing Device (9), time monitoring module (10), alarm module (12) are connect with central controller (15)；Idle simulation source (32) is equipped with Reacance generator (6), reacance generator (6) include for energy storage and filtering out the first reactor of high frequency switching ripple electric current (61), the PWM converter (62) of reactive compensation signal, driving circuit (64) are provided using three-phase full-controlled bridge topological form, first Reactor (61) is connect by transformer (2) with power supply grid (4), the exchange side of PWM converter (62) and the first reactor (61) it connects, the DC side of PWM converter (62) is connect with storage capacitor (63), and PWM converter (62) passes through driving circuit (64) central controller (15) are connected to；Alarm module (12) includes the current value for receiving when central controller (15) And/or voltage value exceed threshold value when alert alarm Current Voltage alarm module (121), for when center control The time value that device (15) processed receives exceed threshold value when alert alarm time alarm module (122), be used for The temperature alarming module that alert is alarmed when the temperature value that central controller (15) receives exceeds threshold value (123), it is used for the cigarette that alert is alarmed when the smokescope that central controller (15) receives exceeds threshold value Mist alarm module (124) is used for the alert progress when the harmonic value that central controller (15) receives exceeds threshold value The harmonic wave alarm module (125) of alarm, Current Voltage alarm module (121), time alarm module (122), temperature alarming module (123), smog alarm module (124), harmonic wave alarm module (125) are connect with central controller (15).

2. low-voltage electric energy quality testing monitoring system according to claim 1, it is characterised in that: further include the first communication mould Block (11), first communication module (11) are connect with central controller (15), alarm module respectively, are passed through first communication module (11) Warning message is transmitted to host computer (13).

3. low-voltage electric energy quality testing monitoring system according to claim 1 or 2, it is characterised in that: further include and center The data memory module (7) of controller (15) connection, stores warning message by data memory module (7).

4. low-voltage electric energy quality testing monitoring system according to claim 3, it is characterised in that: data memory module (7) Database server (71) and disk array (72) including interconnection, database server (71) and central controller (15) Connection, central controller are stored warning message to disk array (72) by database server, and host computer (13) is from disk Warning message is read in array (72).

5. low-voltage electric energy quality testing monitoring system according to claim 1 or 2 or 4, it is characterised in that: idle simulation source (32) it is equipped with RS485 interface, reacance generator (6) is connect by RS485 interface with central controller (15).

6. low-voltage electric energy quality testing monitoring system according to claim 5, it is characterised in that: transformer (2) passes through RS485 interface is connect with central controller (15).

7. low-voltage electric energy quality testing monitoring system described according to claim 1 or 2 or 4 or 6, it is characterised in that: three-phase is humorous Wave source (5) include detection module (53), for the harmonic oscillator (52) of output harmonic wave voltage, for harmonic oscillator (52) The PWM controller (51) that the harmonic voltage of output carries out electric voltage frequency and amplitude is controlled, harmonic oscillator (52) and PWM are controlled Device (51) connection processed, PWM controller (51) are connect with host computer (13).

8. low-voltage electric energy quality testing monitoring system according to claim 7, it is characterised in that: harmonic oscillator (52) packet It includes second communication module (524), relay output module (522), analog output module (523), three phase harmonic and module occurs (521), the input terminal of detection module (53) is connect with power supply grid (4), the output end of detection module (53) and host computer (13) Connection, host computer (13) pass through second communication module (524) input terminal and analog quantity with relay output module (522) respectively The input terminal of output module (523) connects, the output end of relay output module (522) and analog output module (523) Output end occurs module (521) with three phase harmonic respectively and connect, and three phase harmonic occurs module (521) and connect with power supply grid (4)； Three phase harmonic occurs module (521) and is equipped with sequentially connected pre-filter (16), harmonic power module (17), postfilter (18), harmonic power module (17) includes for establishing the PWM rectifier of steady dc voltage (171), DC side energy storage electricity Hold, the PWM inverter (173) for generating given voltage signal, PWM rectifier (171), DC side storage capacitor (172), PWM inverter (173) is sequentially connected, and the output end of pre-filter (16) is connect with the input terminal of PWM rectifier (171), and PWM is inverse Become device (173) output end connect with postfilter (18), the output end of PWM controller (51) respectively with PWM rectifier (171), PWM inverter (173) connects.

9. low-voltage electric energy quality testing monitoring system according to claim 8, it is characterised in that: PWM controller (51) is adopted With single-chip microcontroller (510), harmonic oscillator (52) is located in harmonic source cabinet (30), and single-chip microcontroller (510) is located at harmonic controling cabinet (31) Interior, transformer (2) is located in transformer case (33), power grid simulation source (3), harmonic source cabinet (30), harmonic controling cabinet (31), idle Simulation source (32), transformer case (33) are each provided at beside sample (1), and sample (1) is located on testing jig (27), are tested Frame (27) is located on metope, and testing jig (27) is equipped with patch bay (28), and patch bay (28) is supported on ceiling by support frame (29) Lower section, support frame (29) fixation are located on metope or ceiling, and patch bay (28) is equipped with wire casing (280), and cable is embedded online In slot (280), power grid simulation source (3), harmonic source cabinet (30), harmonic controling cabinet (31), idle simulation source (32), transformer case (33), sample (1) is connect by cable with power supply grid (4).