CN209471196U - A kind of low-voltage electric energy quality detecting system - Google Patents

Abstract

The utility model discloses a kind of low-voltage electric energy quality detecting system, including power grid simulation source, Three-phase harmonic source, idle simulation source, monitoring system, the central controller controlled to system, the host computer being connect with central controller；The utility model uses the low-voltage electric energy quality detecting system being made of power grid simulation source, Three-phase harmonic source, idle simulation source, monitoring system, the adaptability for realizing the normal abnormal characteristic of simulation power supply grid by power grid simulation source and examining sample to power supply grid；Power quality problem present on simulation power supply grid is realized by Three-phase harmonic source and idle simulation source, to examine sample to the compensation ability of power quality；The security monitoring to system is realized by monitoring system；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

A kind of low-voltage electric energy quality detecting system

Technical field

The utility model relates to a kind of detection system more particularly to a kind of low-voltage electric energy quality detecting 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 power quality becomes contemporary society's electricity consumption producer and closed The main problem of the heart, in order to improve power quality, enterprise can use power compensation equipment in power grid, therefore set to power compensation The inspection of next choice compensation characteristics is particularly important.Since there are many power quality problems for power supply grid, it is temporary easily to there is voltage The misoperations phenomenon such as drop, flickering, frequency fluctuation, harmonic wave interference, instantaneous overload, and power quality detection system equipment is in length Inevitably occur component aging, failure, the interference by adverse circumstances in time operational process, causes in system equipment failure rate It rises, accuracy of measurement decline, or generates invalid abnormal data, system equipment global reliability reduces, so that three-phase is not Equilibrium problem, mains by harmonics problem also become to get worse.Currently, what existing low-voltage electric energy quality detecting system was primarily present Disadvantage is: it is on the one hand, unreasonable due to lacking effective power factor compensation mechanism or power factor compensation setting, it is easy to produce Raw undercompensation phenomenon and overcompensation phenomenon, prevent system equipment damages electrical equipment, or even danger from playing due function And system equipment and other electricity consumption installation securities, greatly reduce the service life of system equipment；On the other hand, since three-phase is humorous Wave source and reactive compensation design are unreasonable, access the nonlinear-load of network system, impact load is easy to produce voltage fluctuation The problems such as flickering, the convex liter of voltage sag and serious three-phase imbalance, it cannot ensure the accuracy and reliability of control logic, It is difficult to realize the accurate control of overtone order and amplitude, so that low-voltage electric energy quality detecting system equipment is easy to appear improper fortune Row state even results in the security risks such as system jam, fire and cannot alarm in time；Additionally, there may be design it is many and diverse, Parallel extended ability is poor, operation stability is lower, data test accuracy is lower and wiring is cumbersome and complicated for operation, operation The problems such as 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 Examining system, the low-voltage electric energy quality detecting system are made of power grid simulation source, Three-phase harmonic source, idle simulation source, monitoring system, It realizes the normal abnormal characteristic of simulation power supply grid by power grid simulation source and examines sample and power supply grid is fitted It should be able to power；Power quality problem present on simulation power supply grid is realized by Three-phase harmonic source and idle simulation source, with inspection Sample is tested to the compensation ability of power quality；The security monitoring to system is realized by monitoring system；And it is controlled by PWM Device processed to three phase harmonic occur module simultaneously export multi-frequency superposition harmonic voltage control, reached PWM rectification and The independent control of inversion further ensures the accuracy and reliability of control logic, realizes the essence of overtone order and amplitude Really control, reduces the security risk in system operation.

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

A kind of low-voltage electric energy quality detecting system, including being simulated and being examined for the normal abnormal characteristic to power supply grid It tests power grid simulation source of the sample to the adaptability of power supply grid, the Three-phase harmonic source for output harmonic wave voltage, be used for During the idle simulation source of reactive compensation signal, the monitoring system for being monitored to system are provided, controlled to system The host computer entreating controller, connecting with central controller, power grid simulation source are connect with power supply grid, and sample becomes by first Depressor is connect with power grid simulation source, is connected between Three-phase harmonic source, idle simulation source by the way that third transformer is in parallel with sample It connects, power grid simulation source, Three-phase harmonic source, idle simulation source, the first transformer, sample, host computer pass through central control respectively Device processed is connect with monitoring system.The normal abnormal characteristic of simulation power supply grid is realized by power grid simulation source and is examined tested Adaptability of the sample to power supply grid；It is realized present on simulation power supply grid by Three-phase harmonic source and idle simulation source Power quality problem, to examine sample to the compensation ability of power quality；The peace to system is realized by monitoring system Full monitoring.

Preferably, power grid simulation source, which is connected with, carries out the current detection module of current sample, to electricity to power grid simulation source Net simulation source carries out the voltage detection module of voltage sample, and current detection module, voltage detection module pass through power factor compensation Circuit is connected on central controller.By the setting of power factor compensation circuit, power factor is enabled to reach 0.95, Harmonic current content is lower than 3%FS, smaller to the interference of power supply grid；Sample is carried out by power factor compensation circuit Dynamic power factor compensation, the adaptability for making it possible to examine sample to power supply grid, realizes to power supply grid just The detection of normal abnormal characteristic.

Preferably, power factor compensation circuit include interconnect regulated power supply, power factor compensating main circuit, Pwm pulse modulation and drive control circuit, phase current voltage detecting and comparison circuit, regulated power supply are circuit power supply, power Factor compensation main circuit includes the first filter inductance, the second filter inductance, the first filter condenser, the second filter condenser, the Three filter condensers, charge and discharge capacitance device, absorption capacitor, coupling capacitor, the second transformer, current sense resistor, first Voltage detection resistances, second voltage detection resistance, the first power switch component, the second power switch component, the first filter inductance One end and alternating current input terminal L connection, the other end of the first filter inductance and charge and discharge capacitance device, first voltage detection electricity One end of the armature winding N1 of resistance, one end connection of current sense resistor, the other end of charge and discharge capacitance device and the second transformer Connection, the other end of the armature winding N1 of the second transformer and the first power switch component and the second power switch component in parallel Connection, the anode of the cathode of the first power switch component and the second power switch component are connected to the common end N of alternating current, and first The cathode of power switch component and the second power switch component and driving stage are connected respectively to pwm pulse modulation and drive control electricity First driving circuit and isolated drive circuit on road；One end of first filter condenser is connected to the input terminal L of alternating current, and first The common end N connection of the other end and alternating current of filter condenser；One end of second filter condenser and the first filter inductance connect It connects, the other end of the second filter condenser is connected on the common end N of alternating current；The other end of first voltage detection resistance is distinguished It is connect with one end of the voltage detecting circuit of phase current voltage detecting and comparison circuit, second voltage detection resistance, the second electricity The other end of pressure detection resistance is connected to the common end N of alternating current；The other end of current sense resistor passes through the second filter inductance It is connected to the output end LM of alternating current；Absorption capacitor is in parallel with the secondary windings N2 of the second transformer, and the one of absorption capacitor End is connect with the output end LM of alternating current, and the other end of absorption capacitor and one end of coupling capacitor connect, coupling capacitor The other end be connected to the common end N of alternating current；Third filter condenser, sample one end respectively with the output of alternating current Hold LM connection, third filter condenser, sample the other end be connected respectively to the common end N of alternating current.Wherein, power because When number compensation circuit work, in the input terminal L and common end N input AC electricity AC, alternating current AC of power factor compensating main circuit Charge and discharge capacitance device, the second transformer are supplied to by the first filter condenser, the first filter inductance, the second filter condenser The circuit that armature winding N1, the first power switch component, the second power switch component form, then pass through current sense resistor, warp It crosses after the second filter inductance and the filtering of third filter condenser, supplies sample；

Specifically, the voltage detecting circuit of phase current voltage detecting and comparison circuit is via power factor compensating main circuit After interior first voltage detection resistance and second voltage detection resistance partial pressure, the end voltage of sample is detected；Electricity Current detection circuit flows through the electric current of sample by current sense resistor detection, then at the voltage and current waveform that will test It after reason, is transmitted to electric current and is compared with voltage comparator circuit, pwm pulse modulation and drive control are controlled by control voltage Pwm pulse modulation circuit control driving circuit and isolated drive circuit in circuit, respectively to the first power switch component and the Two power switch components carry out switch control；Phase detecting circuit handles it to the voltage waveform that voltage detecting circuit detects Afterwards, it is transmitted to pwm pulse modulation and the phase and automatic power factor control circuit in drive control circuit, by phase and automatically Power factor control circuit controls the first power by pwm pulse modulation circuit, the first driving circuit and isolated drive circuit and opens The on-off sequence for closing element and the second power switch component, by the armature winding N1 of the second transformer to filling within the 0- pi/2 period Discharge capacity device carries out pulse charging, carries out pulsed discharge to charge and discharge capacitance device within -2 π period of 3 pi/2；In pi/2-π Pulsed discharge is carried out to charge and discharge capacitance device in period, pulsed is carried out to charge and discharge capacitance device within the π -3/2 π period and is filled Electricity；When power factor is lower than 1, electric current and voltage comparator circuit in phase current voltage detecting and comparison circuit export definite value Voltage controls pwm pulse modulation and the pwm pulse modulation circuit in drive control circuit, is driven by the first driving circuit and isolation Dynamic circuit controls the turn-on and turn-off time of the first power switch component and the second power switch component respectively, and then controls second The armature winding N1 of transformer and the make-and-break time of charge and discharge capacitance device；In alternating current 0- pi/2 and pulsed in the π -3/2 π period When on-off, the first power switch component and the second power switch component are by adjusting pwm pulse width, that is, make-and-break time, to adjust The charge volume of charge and discharge capacitance device；In alternating current pi/2-π and pulse on-off in 3/2 π-2 π period, the first power switch component With the second power switch component by adjusting PWM make-and-break time, to adjust the discharge capacity of charge and discharge capacitance device；Adjust compensation charge and discharge The discharge and recharge of electric capacitor is equivalent to the capacitance for having adjusted compensation charge and discharge capacitance device, and then realizes dynamic and compensate；When When first power switch component and the second power switch component are respectively turned on, electric current passes through the first filter inductance, charge and discharge capacitance When the armature winding N1 of device and the second transformer, electric energy is stored in the first filter inductance, works as shutdown moment, is stored in first Electric energy in filter inductance releases after the second filter inductance and the filtering of third filter condenser, carries out to sample PFC；On the other hand, the electric energy being stored in the second transformer passes through secondary windings N2, absorption capacitor and coupling Capacitor releases, and is corrected again to the power factor of sample.

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 first 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 first 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；Three-phase harmonic source is used for output harmonic wave voltage, Three-phase harmonic source Three phase harmonic 2 to 50 times higher hamonic waves can be exported, it can be achieved that more parallel runnings, have parallel extended ability, and have Have strong antijamming capability, operation stability are high, data test is accurate and reliable, the speed of service is fast, work efficiency is high, wiring simply and Operate many advantages, such as convenient, operational process is safe.

In the utility model patent, sample is connected on harmonic oscillator by third transformer, third transformer Voltage transformation is carried out to the harmonic voltage of harmonic oscillator output and transmits electric energy, Three-phase harmonic source is improved and is examining detected sample Product are to the adaptability during the compensation ability of power quality.

Preferably, it includes that module, B phase harmonic wave hair occur for completely identical in structure A phase harmonic wave that module, which occurs, for three phase harmonic Module occurs for raw module, C phase harmonic wave, and module occurs for A phase harmonic wave, module occurs for B phase harmonic wave, C phase harmonic wave occurs module and is equipped with Circuit occurs for three phase harmonic, and it includes state monitor, A.C. contactor, relay, dull harmonic elimination electricity that circuit, which occurs, for three phase harmonic The input terminal on road, high pass harmonic elimination circuit, anti-parallel thyristor, state monitor is connect by breaker with power supply grid, state The output end of monitor is connected by one end of A.C. contactor and relay contact, and the other end and the dullness of relay contact disappear The other end and inverse parallel crystalline substance lock of the connection of one end of humorous circuit or high pass harmonic elimination circuit, dull harmonic elimination circuit or high pass harmonic elimination circuit One end of pipe connects, and the other end of the anti-parallel thyristor of each branch links together, and the trigger signal of anti-parallel thyristor is defeated Enter end to connect with analog output module, the coil of relay is connect with relay output module, the communication ends of state monitor Mouth is connect with first communication module.State monitor is mainly used for realizing the status monitoring, interlock function and zero passage of each branch The detection of signal guarantees 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 first reactor, the first electricity Container.

In the utility model patent, high pass harmonic elimination circuit includes second resistance, the second reactor, the second capacitor, third Capacitor, formation parallel branch in parallel with the second 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, three phase harmonic occur module be equipped with sequentially connected pre-filter, harmonic power module, Postfilter, harmonic power module include for establishing the PWM rectifier of steady dc voltage, DC side storage capacitor, using In the PWM inverter for generating given voltage signal, PWM rectifier, DC side storage capacitor, PWM inverter are sequentially connected, preceding The output end of filter and the input terminal of PWM rectifier connect, and the output end of PWM inverter is connect with postfilter, PWM control The output end of device is connect with PWM rectifier, PWM inverter respectively；Wherein, by host computer to three-phase current rippled interface, shape State monitoring display interface and harmonic wave generate number set interface and are configured, show；Using by pre-filter, harmonic power mould Block, postfilter combine the three phase harmonic to be formed and module occur, and module occurs to three phase harmonic by PWM controller and exports simultaneously The harmonic voltage of multi-frequency superposition is controlled, and has reached the independent control of PWM rectification and inversion, it is ensured that control logic Accuracy and reliability realizes the accurate control of overtone order and amplitude.

Specifically, pre-filter and postfilter are all made of RLC filtering mode, wherein pre-filter and postfilter are equal Filter inductance, filter resistance, filter capacitor including interconnection, filter inductance are connected in series in PWM rectifier, filtered electrical Resistance is connected in parallel in PWM rectifier again after being connected in series with filter capacitor.

Preferably, PWM controller uses single-chip microcontroller, single-chip microcontroller is equipped with dual-port parallel port RAM, dual-port parallel port RAM tool There are data input port, data output, address input port, address scan mouth, the data input port of dual-port parallel port RAM, address Input port is connected on single-chip microcontroller；

Preferably, single-chip microcontroller is connected with for the one 8 parallel port analog-digital converter of regulation amplitude, the 2nd 8 parallel port Analog-digital converter, the data port of the one 8 parallel port analog-digital converter, the data port of the 2nd 8 parallel port analog-digital converter with list The connection of piece machine, the REF mouth and base modules of the REF mouth of the one 8 parallel port analog-digital converter, the 2nd 8 parallel port analog-digital converter Output connection；

Preferably, single-chip microcontroller is also connected with the 3rd 8 parallel port analog-digital converter, the 4th 8 for controlling output waveform Position parallel port analog-digital converter, the 3rd 8 parallel port analog-digital converter, the 4th 8 parallel port analog-digital converter pass through dual-port parallel port The data output of RAM is connected to single-chip microcontroller；

Preferably, the delivery outlet of the one 8 parallel port analog-digital converter, the 2nd 8 parallel port analog-digital converter is respectively with The connection of one amplifier array, the output end of the first amplifier array respectively with the 3rd 8 parallel port analog-digital converter, the 4th 8 and mouth mold The REF mouth of number converter connects, the 3rd 8 parallel port analog-digital converter, the 4th 8 parallel port analog-digital converter output end respectively with The connection of second amplifier array, the output end of the second amplifier array are 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, 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.

Preferably, idle simulation source is equipped with reacance generator, reacance generator includes being used to energy storage and filtering out high frequency open First reactor of pass ripple current, the PWM converter that reactive compensation signal is provided using three-phase full-controlled bridge topological form, second Driving circuit, the first reactor are connect by third transformer with power supply grid, the exchange side of PWM converter and the first reactor Connection, the DC side of PWM converter are connect with storage capacitor, and PWM converter is connected to central control by the second driving circuit Device；The setting being connected in parallel between Three-phase harmonic source, idle simulation source by third transformer and sample, third transformer Voltage transformation is carried out to the harmonic voltage of harmonic oscillator output and transmits electric energy, Three-phase harmonic source is improved and is examining detected sample Product are to the 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 The DC energy that transistor generates；Second driving circuit receives the control signal of central controller sending, drives PWM converter Semiconductor power device, and also take into account the defencive function to semiconductor power device；Idle simulation source can compensating reactive power, Three-phase imbalance, harmonics restraint are adjusted, the problem of interfering with each other, and the flexible Configuration Online reactive power of energy are avoided, it is effectively real The reasonable compensation of reactive power is showed, the system equipment to be mounted in extremely limited space provides safety guarantee.

In the utility model patent, harmonic oscillator is located in harmonic source cabinet, and single-chip microcontroller is located in harmonic controling cabinet, and first Transformer, third transformer are respectively provided in each transformer case, power grid simulation source, harmonic source cabinet, harmonic controling cabinet, idle Simulation source, transformer case are each provided at beside sample, and sample is set on the tester rack, and test is erected on metope, are tested It is provided with patch bay, patch bay is supported below ceiling by support frame, and support frame fixation is located on metope or ceiling, wiring It is provided with wire casing, cable is embedded in wire casing, power grid simulation source, harmonic source cabinet, harmonic controling cabinet, idle simulation source, transformation Device cabinet, sample pass through cable and connect with power supply grid.The installation formed is combined by support frame, patch bay, testing jig Structure not only provided higher stability, fixing and balanced capacity for the installation of system equipment and wiring, but also system is set Safety compact and with higher is counted, and the limited test space is adequately utilized.

In the utility model patent, monitoring system includes the harmonic wave for detecting the harmonic wave of Three-phase harmonic source and will test Value be transmitted to central controller power quality analyzer, for detection system equipment temperature signal temperature sensor, use Smoke sensor device, the time monitoring mould that is monitored for the working condition to system in the smoke signal of detection system equipment Block, the alarm module for alarming system, alarm module are connect with host computer, power quality analyzer, temperature sensing Device, smoke sensor device, time monitoring module, alarm module are connect with central controller；Alarm module includes for when center The Current Voltage alarm mould that alert is alarmed when the current value and/or voltage value that controller receives exceed threshold value The time alarm mould that alert is alarmed when block, the time value for receiving when central controller exceed threshold value The temperature alarming mould that alert is alarmed when block, the temperature value for receiving when central controller exceed threshold value The smog alarm mould that alert is alarmed when block, the smokescope for receiving when central controller exceed threshold value The harmonic wave alarm mould that alert is alarmed when block, the harmonic value for receiving when central controller exceed threshold value Block, Current Voltage alarm module, time alarm module, temperature alarming module, smog alarm module, harmonic wave alarm module are in Entreat controller connection.

In the utility model patent, monitoring system further includes second communication module, and second communication module is controlled with center respectively Device processed, alarm module connection, are transmitted to host computer for warning message by second communication module.

In the utility model patent, monitoring system further includes the data memory module connecting with central controller, passes through number Warning message is stored according to memory module, data memory module can also store low-voltage electric energy quality testing data.

In the utility model patent, data memory module includes the database server and disk array interconnected, number It is connect according to library server with central controller, central controller is stored warning message to disk battle array by database server Column, host computer read warning message from disk array.By combining the data formed by database server and disk array Memory module is combined with the technical solution of above-mentioned monitoring system, improves the reliability of power quality detection system, to mention The high integrality and accuracy of power quality data, and different monitoring functions can be set according to monitoring demand, utilize storage In the data of database server evaluation system is established, according to the anti-low-voltage electric energy quality detecting system that pushes away of the superiority and inferiority of the quality of data Reliability carries out the assessment of long-range reliability to low-voltage electric energy quality detecting system to realize, can also to system reliability into Row diagnosis and analysis, and system is overhauled and safeguarded accordingly by the historical variations trend of reliability assessment.

In the utility model patent, idle simulation source is equipped with RS485 interface, and reacance generator is by RS485 interface in Entreat controller connection.

In the utility model patent, the first transformer, third transformer pass through RS485 interface respectively and central controller connects It connects.

The utility model due to use above technical scheme, have significant technical effect: using by power grid simulation source, The low-voltage electric energy quality detecting system that Three-phase harmonic source, idle simulation source, monitoring system form, is realized by power grid simulation source It simulates the normal abnormal characteristic of power supply grid and examines sample to the adaptability of power supply grid；Pass through Three-phase harmonic source Power quality problem present on simulation power supply grid is realized with idle simulation source, to examine sample to power quality Compensation ability；The security monitoring to system is realized by monitoring system；Further through power factor compensation circuit to sample Dynamic power factor compensation is carried out, the adaptability for making it possible to examine sample to power supply grid is realized to power supply grid Normal abnormal characteristic detection, and by PWM controller to three phase harmonic occur module simultaneously export multi-frequency superposition Harmonic voltage is controlled, reached PWM rectification and inversion independent control, further ensure control logic accuracy and Reliability realizes the accurate control of overtone order and amplitude, reduces the security risk in system operation；System tool Have strong antijamming capability, operation stability are high, data test is accurate and reliable, the speed of service is fast, work efficiency is high, wiring simply and Operate many advantages, such as convenient, operational process is safe.

Detailed description of the invention

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

Fig. 2 is the circuit diagram of the power factor compensation circuit embodiment of the utility model.

Fig. 3 is the functional block diagram of the reacance generator embodiment of the utility model.

Fig. 4 is the circuit of the reacance generator embodiment being made of the first reactor and PWM converter of the utility model Schematic diagram.

Fig. 5 is that the Three-phase harmonic source of the utility model carries out the functional block diagram of detection embodiment to sample.

Fig. 6 is the schematic block circuit diagram of the Three-phase harmonic source embodiment of the utility model.

Fig. 7 is that the circuit diagram of circuit embodiments occurs for the three phase harmonic of the utility model.

Fig. 8 is that the circuit diagram of module major loop embodiment occurs for the three phase harmonic of the utility model.

Fig. 9 is that the PWM controller of the utility model uses the functional block diagram of single-chip microcontroller embodiment.

Figure 10 is that the harmonic source cabinet, harmonic controling cabinet, sample of the utility model install the structural schematic diagram of embodiment.

Figure 11 is the d shaft current closed loop feedback control block diagram of the PWM controller embodiment of the utility model.

Figure 12 is the d shaft current closed loop feedback control frame carried out using Feedforward Decoupling algorithm to Figure 11 after Feedforward Decoupling Figure.

Figure 13 is the d shaft current closed loop feedback control block diagram after simplifying Figure 12.

Figure 14 is the d shaft current inner loop control block diagram that the utility model has decoupled.

Figure 15 is the d shaft current inner loop control block diagram after simplifying Figure 14.

Specific embodiment

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

A kind of low-voltage electric energy quality detecting system, as Figure 1-10 shows, including special for the normal exception to power supply grid 4 Property simulated and examine sample to the power grid simulation source 3 of the adaptability of power supply grid 4, for output harmonic wave voltage Three-phase harmonic source 5, the idle simulation source 32 for providing reactive compensation signal, the monitoring system for being monitored to system, The central controller 15 that system is controlled, the host computer 13 being connect with central controller 15, power grid simulation source 3 and power supply electricity Net 4 connects, and sample 1 is connect by the first transformer 2 with power grid simulation source 3, Three-phase harmonic source 5, idle simulation source 32 it Between be connected in parallel with sample 1 by third transformer 37, power grid simulation source 3, Three-phase harmonic source 5, idle simulation source 32, the One transformer 2, sample 1, host computer 13 are connect by central controller 15 with monitoring system respectively.

In the present embodiment, power grid simulation source be connected with to power grid simulation source 3 carry out current sample current detection module 35, The voltage detection module 36 of voltage sample is carried out to power grid simulation source 3, current detection module 35, voltage detection module 36 pass through function Rate factor compensation circuit 34 is connected on central controller 15.

In the present embodiment, power factor compensation circuit 34 includes the regulated power supply 344 interconnected, power factor compensation master Circuit 341, pwm pulse modulation and drive control circuit 343, phase current voltage detecting and comparison circuit 342, regulated power supply 344 power for circuit, and power factor compensating main circuit 341 includes the first filter inductance 34109, the second filter inductance 34101, the One filter condenser 34110, the second filter condenser 34111, third filter condenser 34112, charge and discharge capacitance device 34107, Absorption capacitor 34113, coupling capacitor 34114, the second transformer 34106, current sense resistor 34102, first voltage inspection Measuring resistance 34103, second voltage detection resistance 34104, the first power switch component 34108, the second power switch component 34105, one end of the first filter inductance 34109 and the input terminal L connection of alternating current, the other end of the first filter inductance 34109 It is connect with one end of charge and discharge capacitance device 34107, first voltage detection resistance 34103, current sense resistor 34102, charge and discharge The other end of capacitor 34107 is connect with one end of the armature winding N1 of the second transformer 34106, the second transformer 34106 The other end of armature winding N1 is connect with the first power switch component 34108 in parallel and the second power switch component 34105, the The anode of the cathode of one power switch component 34108 and the second power switch component 34105 is connected to the common end N of alternating current, The cathode of first power switch component 34108 and the second power switch component 34105 and driving stage are connected respectively to pwm pulse tune The first driving circuit 3434 and isolated drive circuit 3432 of system and drive control circuit 343；First filter condenser 34110 One end is connected to the input terminal L of alternating current, the common end N connection of the other end and alternating current of the first filter condenser 34110；The One end of two filter condensers 34111 is connect with the first filter inductance 34109, and the other end of the second filter condenser 34111 connects It connects on the common end N of alternating current；The other end of first voltage detection resistance 34103 respectively with phase current voltage detecting with than Compared with one end connection of the voltage detecting circuit 3423, second voltage detection resistance 34104 of circuit 342, second voltage detection resistance 34104 other end is connected to the common end N of alternating current；The other end of current sense resistor 34102 passes through the second filter inductance 34101 are connected to the output end LM of alternating current；Absorption capacitor 34113 is in parallel with the secondary windings N2 of the second transformer 34106, One end of absorption capacitor 34113 and the output end LM connection of alternating current, the other end and coupled capacitor of absorption capacitor 34113 One end of device 34114 connects, and the other end of coupling capacitor 34114 is connected to the common end N of alternating current；Third filter condenser 34112, one end of sample 1 is connect with the output end LM of alternating current respectively, third filter condenser 34112, sample 1 The other end be connected respectively to the common end N of alternating current.Wherein, when power factor compensation circuit works, in power factor compensation The input terminal L and common end N input AC electricity AC, alternating current AC of main circuit by the first filter condenser, the first filter inductance, Second filter condenser is supplied to charge and discharge capacitance device, the armature winding N1 of the second transformer, the first power switch component, second The circuit of power switch component composition, then by current sense resistor, filtered by the second filter inductance and third filter condenser After wave, sample is supplied；

In the present embodiment, the voltage detecting circuit 3423 of phase current voltage detecting and comparison circuit is mended via power factor After repaying the first voltage detection resistance and second voltage detection resistance partial pressure in main circuit, the end voltage of sample is carried out Detection；Current detection circuit 3421 flows through the electric current of sample, then the voltage that will test by current sense resistor detection It after current waveform processing, is transmitted to electric current and is compared with voltage comparator circuit 3422, PWM arteries and veins is controlled by control voltage Pwm pulse modulation circuit 3433 in modulated and drive control circuit controls the first driving circuit 3434 and isolated drive circuit 3432, switch control is carried out to the first power switch component 34108 and the second power switch component 34105 respectively；Phase-detection After the voltage waveform processing that circuit 3424 detects voltage detecting circuit 3423, it is transmitted to pwm pulse modulation and is controlled with driving Phase and automatic power factor control circuit 3431 in circuit processed, are passed through by phase and automatic power factor control circuit 3431 Pwm pulse modulation circuit 3433, the first driving circuit 3434 and isolated drive circuit 3432 control the first power switch component 34108 and second power switch component 34105 on-off sequence, by the armature winding N1 of the second transformer within the 0- pi/2 period Pulse charging is carried out to charge and discharge capacitance device, pulsed discharge is carried out to charge and discharge capacitance device within -2 π period of 3 pi/2；π/ Pulsed discharge is carried out to charge and discharge capacitance device in the 2- π period, pulsed is carried out to charge and discharge capacitance device within the π -3/2 π period Charging；When power factor is lower than 1, the electric current and voltage comparator circuit output in phase current voltage detecting and comparison circuit are fixed Threshold voltage controls pwm pulse modulation and the pwm pulse modulation circuit in drive control circuit, passes through the first driving circuit and isolation Driving circuit controls the turn-on and turn-off time of the first power switch component and the second power switch component respectively, and then controls the The armature winding N1 of two transformers and the make-and-break time of charge and discharge capacitance device；In alternating current 0- pi/2 and pulse in the π -3/2 π period When formula on-off, the first power switch component and the second power switch component are by adjusting pwm pulse width, that is, make-and-break time, to adjust Save the charge volume of charge and discharge capacitance device；In alternating current pi/2-π and pulse on-off in 3/2 π-2 π period, the first power switch member Part and the second power switch component are by adjusting PWM make-and-break time, to adjust the discharge capacity of charge and discharge capacitance device；Compensation is adjusted to fill The discharge and recharge of discharge capacity device is equivalent to the capacitance for having adjusted compensation charge and discharge capacitance device, and then realizes dynamic and compensate； When the first power switch component and the second power switch component are respectively turned on, electric current is by the first filter inductance, charge and discharge electricity When the armature winding N1 of container and the second transformer, electric energy is stored in the first filter inductance, works as shutdown moment, is stored in Electric energy in one filter inductance releases after the second filter inductance and the filtering of third filter condenser, to sample into Row PFC；On the other hand, the electric energy being stored in the second transformer passes through secondary windings N2, absorption capacitor and coupling It closes capacitor to release, the power factor of sample is corrected again.

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；Harmonic oscillator 52 includes the first communication Module 521 occurs for module 524, relay output module 522, analog output module 523, three phase harmonic, detection module 53 Input terminal is connect with power supply grid 4, and the output end of detection module 53 is connect with host computer 13, and host computer 13 passes through the first communication mould Block 524 is connect with the input terminal of the input terminal of relay output module 522 and analog output module 523 respectively, and relay is defeated The output end of the output end and analog output module 523 of module 522 is connect with three phase harmonic generation module 521 respectively out, and three Phase harmonic wave occurs module 521 and connect with power supply grid 4.

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 first 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, 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 include for establishing the PWM rectifier 171 of steady dc voltage, DC side storage Can capacitor, 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, PWM inverter 173 output end is connect with postfilter 18, the output end of PWM controller 51 respectively with PWM rectifier 171, PWM inverter 173 connections.Wherein, number setting is generated to three-phase current rippled interface, status monitoring display interface and harmonic wave by host computer Interface is configured, shows；Occurred using the three phase harmonic formed is combined by pre-filter, harmonic power module, postfilter Module, occurs module to three phase harmonic by PWM controller while the harmonic voltage for exporting multi-frequency superposition controls, and reaches The independent control of PWM rectification and inversion is arrived, it is ensured that the accuracy and reliability of control logic realizes overtone order and width The accurate control of value.

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 in PWM rectifier again after being connected in series.

In the present embodiment, PWM controller 51 simulates power supply grid three-phase equilibrium or unbalanced using three-phase decoupling algorithm Normally, abnormal characteristic, three-phase decoupling algorithm include following particular content:

51 input current of PWM controller is provided by following equation (A):

Formula (A) shows that d, q shaft current intercouple, to formula (A) carry out Laplace transform and arrange obtain it is following Formula (B):

With i_1dAs controlled device, U_1dAs the output of PWM controller 51, can be obtained by formula (B) as shown in figure 11 D shaft current closed loop feedback control block diagram is derived by closed-loop current control device output U by d shaft current closed loop feedback control block diagram_1d Calculation formula (C) are as follows:

Wherein, there is symmetry, d, q shaft current are in addition to being controlled variable U between d shaft current and q shaft current_1d、U_1q's Outside influencing, also by voltage on line side U_2d、U_2qDisturbing influence, the design to PWM controller 51 that intercouples of d, q shaft current makes At certain difficulty, Laplace transform is carried out to formula (A) and significantly reduces this difficult influence to system；By Figure 11 It is found that d shaft current is not only related with given value of current, but also the shadow interfered by q shaft current and power supply grid voltage d axis component It rings, therefore, the q shaft current of coupling and the influence of power supply grid voltage d axis component interference is eliminated using Feedforward Decoupling algorithm, is used The d shaft current inner ring closed-loop control block diagram of Feedforward Decoupling algorithm is as shown in figure 12, is derived by d shaft current inner ring closed-loop control block diagram It obtains the closed loop controller after calculating by Feedforward Decoupling algorithm and exports U_1dCalculation formula (D) are as follows:

Wherein, Figure 12 simplification is obtained into Figure 13, q axis coupling electricity is as can be seen from Figure 13 eliminated using Feedforward Decoupling algorithm After the disturbance of stream and power supply grid voltage, current inner loop controlled device can simplify into a simple first order inertial loop； Simultaneously as introducing grid disturbance voltage as feedforward compensation, the anti-interference ability of system is substantially increased.

Specifically, select current controller C (s) as PI controller, shown in the transmission function of C (s) such as function (E):

Wherein,The small inertial properties for considering delay and the PWM control of current inner loop signal sampling, have decoupled D shaft current inner loop control block diagram it is as shown in figure 14, Tu14Zhong, T_SFor current inner loop current sample period, K_PWMFor bridge PWM Equivalent gain；By small time constantT_SMerge, the d shaft current inner loop control block diagram such as Figure 15 institute decoupled being simplified Show；The d axis decoupled when considering that current inner loop needs to obtain faster current following performance, according to simplification shown in figure 15 Current inner loop control block diagram can be seen that only need to be by the zero point cancellation current control object transmission function of the pi regulator of design Pole, it may be assumed thatShown in current inner loop open-loop transfer function such as function (F) after calibrated:

When taking system damping ratio ζ=0.707, calculation formula (G) can be obtained:

Formula (G) is solved to obtain the calculation formula (H) of current inner loop PI adjusting control parameter:

It is acquired shown in the current inner loop closed loop transfer function, such as function (I) after decoupling by Figure 15:

When switching frequency is sufficiently high, i.e. T_SWhen sufficiently small, due to S²Term coefficient is much smaller than S term coefficient, therefore negligible S² , then function (I) is reduced to function (J):

Calculation formula (H) substitution function (J) is obtained into the equivalent transmitting letter that the current inner loop as shown in function (K) simplifies Number:

Function (K) shows: current inner loop Approximate Equivalent is an inertial element, and the inertia time constant of the inertial element is 3T_S；Obviously, when switching frequency is sufficiently high, current inner loop has faster dynamic response；When the closed loop of closed-loop control system increases When benefit reduction extremely -3dB or its phase shift are -45 °, which may be defined as closed-loop system frequency bandwidth f_b；Since the current inner loop can It is equivalent at first order inertial loop, therefore current inner loop frequency bandwidth f_biCalculation formula such as formula (L) shown in:

Wherein, f_SFor current inner loop PWM switch modulation frequency；The PWM control of the utility model design known to formula (L) Device not only meets rapidity requirement, while also having stronger rejection ability to the High-frequency Interference of such as switching frequency noise.

In the present embodiment, PWM controller 51 uses single-chip microcontroller 510, and single-chip microcontroller 510 is equipped with dual-port parallel port RAM19, both-end Mouth parallel port RAM19 has data input port, data output, address input port, address scan mouth, dual-port parallel port RAM19's Data input port, address input port are connected on single-chip microcontroller 510；Single-chip microcontroller 510 is connected with for the one 8 of regulation amplitude simultaneously 24, the 2nd 8 parallel port analog-digital converters 26 of mouth mold number converter, the data port of the one 8 parallel port analog-digital converter 24, the 2nd 8 The data port of position parallel port analog-digital converter 26 is connect with single-chip microcontroller 510, the REF mouth of the one 8 parallel port analog-digital converter 24, the The REF mouth of 28 parallel port analog-digital converters 26 is connect with the output of base modules 25.

In the present embodiment, single-chip microcontroller 510 is also connected with the 3rd 8 parallel port analog-digital converter for controlling output waveform 20, the 4th 8 parallel port analog-digital converter 22,20, the 4th 8 parallel port analog-digital converters 22 of the 3rd 8 parallel port analog-digital converter are equal Single-chip microcontroller 510 is connected to by the data output of dual-port parallel port RAM19.

In the present embodiment, the delivery outlet point of 24, the 2nd 8 parallel port analog-digital converters 26 of the one 8 parallel port analog-digital converter Do not connect with the first amplifier array 23, the output end of the first amplifier array 23 respectively with the 3rd 8 parallel port analog-digital converter 20, The REF mouth of 48 parallel port analog-digital converters 22 connects, 20, the 4th 8 parallel port analog-to-digital conversions of the 3rd 8 parallel port analog-digital converter The output end of device 22 is connect with the second amplifier array 21 respectively, and the output end and harmonic oscillator 52 of the second amplifier array 21 connect It connects.

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, detection module 6 includes current transformer 61, analog-digital converter 62, the input of current transformer 61 End is connect with power supply grid 4, and the output end of current transformer 61 is connect with the input terminal of analog-digital converter 62, analog-digital converter 62 Output end connect with host computer 13.

In the present embodiment, idle simulation source 32 is equipped with reacance generator 6, and reacance generator 6 includes for energy storage and filtering out First reactor 61 of high frequency switching ripple electric current, the PWM that reactive compensation signal is provided using three-phase full-controlled bridge topological form are become Device 62, the second driving circuit 64 are flowed, the first reactor 61 is connect by third transformer 37 with power supply grid 4, PWM converter 62 Exchange side connect with the first reactor 61, the DC side of PWM converter 62 is connect with storage capacitor 63, and PWM converter 62 is logical It crosses the second driving circuit 64 and is connected to central controller 15；Between Three-phase harmonic source, idle simulation source by third transformer with The setting that sample is connected in parallel, third transformer carry out voltage transformation to the harmonic voltage that harmonic oscillator exports and transmit Electric energy improves adaptability of the Three-phase harmonic source during compensation ability for examining sample to power quality；PWM unsteady flow Device is made of insulated gate bipolar transistor, drives insulated gate bipolar transistor to generate compensation by Space Vector Pulse Width Modulation Current waveform, storage capacitor store the DC energy generated by insulated gate bipolar transistor；Second driving circuit receives center The control signal that controller issues, drives the semiconductor power device of PWM converter, and also take into account to semiconductor power device Defencive function；Idle simulation source can compensating reactive power, adjust three-phase imbalance, harmonics restraint, avoid the problem of interfering with each other, The flexible Configuration Online reactive power of energy again, has effectively achieved the reasonable compensation of reactive power, to be mounted on extremely limited sky Between in system equipment provide safety guarantee.

In the present embodiment, harmonic oscillator 52 is located in harmonic source cabinet 30, and single-chip microcontroller 510 is located in harmonic controling cabinet 31, First transformer 2, third transformer 37 are respectively provided in each transformer case 31, power grid simulation source 3, harmonic source cabinet 30, humorous Wave control cabinet 31, idle simulation source 32, transformer case 31 are each provided at 1 side of sample, and sample 1 is located at testing jig 27 On, testing jig 27 is located on metope, and testing jig 27 is equipped with patch bay 28, and patch bay 28 is supported under ceiling by support frame 29 Side, the fixation of support frame 29 are 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 simulation source 3, harmonic source cabinet 30, harmonic controling cabinet 31, idle simulation source 32,2 cabinet of transformer, sample 1 pass through electricity Cable is connect with power supply grid 4.The mounting structure formed is combined by support frame, patch bay, testing jig, had both been the peace of system equipment Dress and wiring provide higher stability, fixing and balanced capacity, and make system compact to design and peace with higher Quan Xing, and the limited test space is adequately utilized.

In the present embodiment, monitoring system includes that the harmonic value for detecting the harmonic wave of Three-phase harmonic source 5 and will test passes Transport to central controller 15 power quality analyzer 14, for detection system equipment temperature signal temperature sensor 8, use Smoke sensor device 9, the time monitoring that is monitored for the working condition to system in the smoke signal of detection system equipment Module 10, the alarm module 12 for alarming system pass through transformer 2 between Three-phase harmonic source 5, idle simulation source 32 It is connected in parallel with sample 1, power grid simulation source 3 is connect with power supply grid 4, is passed through between power grid simulation source 3 and sample 1 Transformer 2 connects, and alarm module 12 is connect with host computer 13, and power grid simulation source 3, idle simulation source 32, becomes Three-phase harmonic source 5 Depressor 2, sample 1, power quality analyzer 14, temperature sensor 8, smoke sensor device 9, time monitoring module 10, alarm Module 12 is connect with central controller 15；Alarm module 12 include current value for receiving when central controller 15 and/ Or the voltage value Current Voltage alarm module 121 that alert is alarmed when exceeding threshold value, for working as central controller 15 time values received exceed threshold value when alert alarm time alarm module 122, for when center control The temperature value that device 15 processed receives exceed threshold value when alert alarm temperature alarming module 123, be used in Alert is alarmed when controller 15 smokescope that receives in centre is beyond threshold value smog alarm module 124 is used The harmonic wave alarm module that alert is alarmed when the harmonic value received when central controller 15 exceeds threshold value 125, Current Voltage alarm module 121, time alarm module 122, temperature alarming module 123, smog alarm module 124, harmonic wave Alarm module 125 is connect with central controller 15.

In the present embodiment, monitoring system further includes second communication module 11, and second communication module 11 is controlled with center respectively Device 15, alarm module connection, are transmitted to host computer 13 for warning message by second communication module 11.

In the present embodiment, monitoring system further includes the data memory module 7 connecting with central controller 15, is deposited by data Storage module 7 stores warning message.

In the present embodiment, data memory module 7 includes the database server 71 and disk array 72 interconnected, data Library server 71 is connect with central controller 15, and central controller 15 is stored warning message to magnetic by database server 71 Disk array 72, host computer 13 read warning message from disk array 72.By being combined by database server and disk array The data memory module of formation is combined with the technical solution of above-mentioned monitoring system, improves the reliable of power quality detection system Property, to improve the integrality and accuracy of power quality data, and different monitoring functions can be set according to monitoring demand, Evaluation system is established using the data for being stored in database server, pushes away the inspection of low-voltage electric energy quality according to the superiority and inferiority of the quality of data is counter The reliability of examining system, thus realize the assessment that long-range reliability is carried out to low-voltage electric energy quality detecting system, it can also be to system Reliability is diagnosed and is analyzed, and system is overhauled and tieed up accordingly by the historical variations trend of reliability assessment Shield.

In the present embodiment, idle simulation source 32 is equipped with RS485 interface, and reacance generator 6 is controlled by RS485 interface and center Device 15 processed connects.

In the present embodiment, the first transformer, third transformer by RS485 interface and central controller 15 respectively by being connected It connects.

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. a kind of low-voltage electric energy quality detecting system, it is characterised in that: including for the normal abnormal characteristic to power supply grid (4) Simulated and examine sample to the power grid simulation source (3) of the adaptability of power supply grid (4), for output harmonic wave voltage Three-phase harmonic source (5), the idle simulation source (32) for providing reactive compensation signal, the monitoring for being monitored to system System, the central controller (15) that system is controlled, the host computer (13) being connect with central controller (15), power grid simulation Source is connect with power supply grid (4), and sample (1) is connect by the first transformer (2) with power grid simulation source (3), three phase harmonic Source (5), idle simulation source are connected in parallel between (32) by third transformer and sample, and power grid simulation source (3), three-phase are humorous Wave source (5), idle simulation source (32), the first transformer (2), sample (1), host computer (13) pass through central controller respectively (15) it is connect with monitoring system；Power grid simulation source (3) is connected with the current detecting mould that power grid simulation source (3) are carried out with current sample Block (35), the voltage detection module (36) that power grid simulation source (3) are carried out with voltage sample, current detection module (35), voltage inspection Module (36) are surveyed to be connected on central controller (15) by power factor compensation circuit (34).

2. a kind of low-voltage electric energy quality detecting system according to claim 1, it is characterised in that: power factor compensation circuit It (34) include the modulation of regulated power supply (344), power factor compensating main circuit (341), pwm pulse and drive control interconnected Circuit (343), phase current voltage detecting and comparison circuit (342), regulated power supply (344) are circuit power supply, and power factor is mended Repaying main circuit (341) includes the first filter inductance (34109), the second filter inductance (34101), the first filter condenser (34110), the second filter condenser (34111), third filter condenser (34112), charge and discharge capacitance device (34107), absorption Capacitor (34113), coupling capacitor (34114), the second transformer (34106), current sense resistor (34102), the first electricity Pressure detection resistance (34103), second voltage detection resistance (34104), the first power switch component (34108), the second power are opened It closes element (34105), one end of the first filter inductance (34109) and the input terminal L connection of alternating current, the first filter inductance (34109) the other end and charge and discharge capacitance device (34107), first voltage detection resistance (34103), current sense resistor (34102) one end connection, the other end of charge and discharge capacitance device (34107) and the armature winding N1 of the second transformer (34106) One end connection, the other end of the armature winding N1 of the second transformer (34106) and the first power switch component in parallel (34108) it is connected with the second power switch component (34105), the cathode and the second power of the first power switch component (34108) The anode of switch element (34105) is connected to the common end N of alternating current, the first power switch component (34108) and the second power The cathode and driving stage of switch element (34105) are connected respectively to first drive of the pwm pulse modulation with drive control circuit (343) Dynamic circuit (3434) and isolated drive circuit (3432)；One end of first filter condenser (34110) is connected to the defeated of alternating current Enter and holds L, the common end N connection of the other end and alternating current of the first filter condenser (34110)；Second filter condenser (34111) one end is connect with the first filter inductance (34109), and the other end of the second filter condenser (34111) is connected to friendship On the common end N of galvanic electricity；The other end of first voltage detection resistance (34103) is electric compared with phase current voltage detecting respectively One end connection of the voltage detecting circuit (3423), second voltage detection resistance (34104) on road (342), second voltage detection electricity The other end of resistance (34104) is connected to the common end N of alternating current；The other end of current sense resistor (34102) passes through the second filter Wave inductance (34101) is connected to the output end LM of alternating current；Time of absorption capacitor (34113) and the second transformer (34106) Grade winding N2 is in parallel, one end of absorption capacitor (34113) and the output end LM connection of alternating current, absorption capacitor (34113) The other end connect with one end of coupling capacitor (34114), the other end of coupling capacitor (34114) is connected to alternating current Common end N；Third filter condenser (34112), sample (1) one end connect respectively with the output end LM of alternating current, Three filter condensers (34112), sample (1) the other end be connected respectively to the common end N of alternating current.

3. a kind of low-voltage electric energy quality detecting system according to claim 1 or 2, it is characterised in that: Three-phase harmonic source (5) Including detection module (53), for the harmonic oscillator (52) of output harmonic wave voltage, for exporting to harmonic oscillator (52) The PWM controller (51) that harmonic voltage carries out electric voltage frequency and amplitude is controlled, harmonic oscillator (52) and PWM controller (51) it connects, PWM controller (51) is connect with host computer (13)；Harmonic oscillator (52) include first communication module (524), after Electric appliance output module (522), analog output module (523), three phase harmonic occur module (521), detection module (53) it is defeated Enter end to connect with power supply grid (4), the output end of detection module (53) is connect with host computer (13), and host computer (13) passes through first Communication module (524) connects with the input terminal of the input terminal of relay output module (522) and analog output module (523) respectively It connects, the output end of relay output module (522) and the output end of analog output module (523) occur with three phase harmonic respectively Module (521) connection, three phase harmonic occur module (521) and connect with power supply grid (4).

4. a kind of low-voltage electric energy quality detecting system according to claim 3, it is characterised in that: module occurs for three phase harmonic It (521) include that module (5211) occur for completely identical in structure A phase harmonic wave, module (5212), C phase harmonic wave hair occur for B phase harmonic wave Raw module (5213), module (5211) occur for A phase harmonic wave, module (5212) occur for B phase harmonic wave, module occurs for C phase harmonic wave (5213) it is equipped with three phase harmonic and circuit (5210) occurs, it includes state monitor that circuit (5210), which occur, for three phase harmonic (52102), A.C. contactor (52103), relay (52104), dull harmonic elimination circuit (52105), high pass harmonic elimination circuit (52107), the input terminal of anti-parallel thyristor (52106), state monitor (52102) is connected by breaker and power supply grid It connects, the output end of state monitor (52102) is connected by one end of A.C. contactor (52103) and relay (52104) contact It connects, the other end of relay (52104) contact and one end of dullness harmonic elimination circuit (52105) or high pass harmonic elimination circuit (52107) The other end of connection, dull harmonic elimination circuit (52105) or high pass harmonic elimination circuit (52107) and anti-parallel thyristor (52106) One end connection, the other end of the anti-parallel thyristor (52106) of each branch link together, anti-parallel thyristor (52106) Trigger signal input terminal is connect with analog output module (523), the coil and relay output module of relay (52104) (522) it connects, the communication port of state monitor (52102) is connect with first communication module (524).

5. a kind of low-voltage electric energy quality detecting system according to claim 4, it is characterised in that: module occurs for three phase harmonic (521) sequentially connected pre-filter (16), harmonic power module (17), postfilter (18), harmonic power module are equipped with (17) include for establish the PWM rectifier of steady dc voltage (171), DC side storage capacitor (172), for generate to The PWM inverter (173) of fixed voltage signal, PWM rectifier (171), DC side storage capacitor (172), PWM inverter (173) it is sequentially connected, the output end of pre-filter (16) is connect with the input terminal of PWM rectifier (171), PWM inverter (173) Output end connect with postfilter (18), the output end of PWM controller (51) respectively with PWM rectifier (171), PWM inversion Device (173) connection.

6. a kind of low-voltage electric energy quality detecting system according to claim 4 or 5, it is characterised in that: PWM controller (51) Using single-chip microcontroller (510), single-chip microcontroller (510) is equipped with dual-port parallel port RAM (19), and dual-port parallel port RAM (19) has data defeated Entrance, data output, address input port, address scan mouth, the data input port of dual-port parallel port RAM (19), address input Mouth is connected on single-chip microcontroller (510)；Single-chip microcontroller (510) is connected with the one 8 parallel port analog-digital converter for regulation amplitude (24), the 2nd 8 parallel port analog-digital converter (26), the data port of the one 8 parallel port analog-digital converter (24), the 2nd 8 parallel port The data port of analog-digital converter (26) is connect with single-chip microcontroller (510), the REF mouth of the one 8 parallel port analog-digital converter (24), The REF mouth of 28 parallel port analog-digital converters (26) is connect with the output of base modules (25).

7. a kind of low-voltage electric energy quality detecting system according to claim 6, it is characterised in that: single-chip microcontroller (510) also connects It is connected to the 3rd 8 parallel port analog-digital converter (20), the 4th 8 parallel port analog-digital converter (22) for controlling output waveform, the 38 parallel port analog-digital converters (20), the 4th 8 parallel port analog-digital converter (22) pass through the number of dual-port parallel port RAM (19) Single-chip microcontroller (510) are connected to according to delivery outlet.

8. a kind of low-voltage electric energy quality detecting system according to claim 7, it is characterised in that: the one 8 parallel port modulus Converter (24), the 2nd 8 parallel port analog-digital converter (26) delivery outlet connect respectively with the first amplifier array (23), first fortune Put the output end of array (23) respectively with the 3rd 8 parallel port analog-digital converter (20), the 4th 8 parallel port analog-digital converter (22) REF mouthfuls of connections, the 3rd 8 parallel port analog-digital converter (20), the 4th 8 parallel port analog-digital converter (22) output end respectively with the The connection of two amplifier arrays (21), the output end of the second amplifier array (21) are connect with harmonic oscillator (52).

9. a kind of low-voltage electric energy quality detecting system described according to claim 1 or 2 or 4 or 5 or 7 or 8, it is characterised in that: Idle simulation source (32) is equipped with reacance generator (6), and reacance generator (6) includes for energy storage and filtering out high frequency switching ripple electricity The first reactor (61) of stream, the PWM converter (62) that reactive compensation signal is provided using three-phase full-controlled bridge topological form, second Driving circuit (64), the first reactor (61) are connect by third transformer (37) with power supply grid (4), PWM converter (62) Exchange side connect with the first reactor (61), the DC side of PWM converter (62) is connect with storage capacitor (63), PWM unsteady flow Device (62) is connected to central controller (15) by the second driving circuit (64).