CN109470966B - Power Grid Simulation Source System - Google Patents
Power Grid Simulation Source System Download PDFInfo
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- CN109470966B CN109470966B CN201910038558.1A CN201910038558A CN109470966B CN 109470966 B CN109470966 B CN 109470966B CN 201910038558 A CN201910038558 A CN 201910038558A CN 109470966 B CN109470966 B CN 109470966B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is AC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a power grid analog source system which comprises a power grid analog source, wherein the power grid analog source system is composed of the power grid analog source, a current detection module, a voltage detection module and a central controller, dynamic power factor compensation is carried out on a tested sample through a power factor compensation circuit, so that the adaptability of the tested sample to a power supply power grid can be checked, the detection of the normal abnormal characteristics of the power supply power grid is realized, the control of the three-phase harmonic generation module to simultaneously output the superimposed harmonic voltage with various frequencies is realized through a PWM controller, the independent control of PWM rectification and inversion is realized, the accuracy and the reliability of control logic are further ensured, the accurate control of harmonic times and amplitude is realized, the potential safety hazard in the operation process of the system is reduced, and the system has the advantages of strong anti-interference capability, high operation stability, accurate and reliable data test, high operation speed, high working efficiency, simple wiring, convenience in operation, safe operation process and the like.
Description
Technical Field
The invention relates to an electric energy quality detection system, in particular to a power grid simulation source system for electric energy quality detection.
Background
In recent years, with the rapid development of power grid technology, the continuous increase of diversified power requirements and the massive access of intermittent distributed energy sources lead to the higher and higher complexity of user side equipment, the power supply grid has a plurality of electric energy quality problems, and the electric energy quality detection system equipment is inevitably aged and disabled in the long-time operation process, is interfered by severe environments, leads to the rise of the failure rate of the system equipment and the reduction of the measurement accuracy, or generates invalid abnormal data, and the overall reliability of the system equipment is reduced, so that the three-phase imbalance problem and the power grid harmonic problem are increasingly serious. The existing power grid analog source system mainly has the defects that on one hand, due to the fact that an effective power factor compensation mechanism is lacked or the power factor compensation is unreasonable, an under-compensation phenomenon and an over-compensation phenomenon are easy to occur, system equipment cannot play a due role, electric equipment is destroyed, even safety of the system equipment and other electric facilities is endangered, service life of the system equipment is greatly reduced, on the other hand, due to the fact that a three-phase harmonic source and reactive compensation are unreasonable in design, nonlinear load and impact load of an access power grid system are easy to generate voltage fluctuation flicker, voltage sag and rise, serious three-phase imbalance and the like, accuracy and reliability of control logic cannot be ensured, accurate control of harmonic frequency and amplitude is difficult to achieve, abnormal operation states of the system equipment are easy to occur, even potential safety hazards such as faults and fires of the system are caused, and the problems of complex design, poor parallel capacity expansion capability, low data testing accuracy, complicated wiring, complex operation, unsafe operation process and the like are also existed.
Disclosure of Invention
The invention solves the technical problems of overcoming the defects of the prior art, and providing a power grid analog source system, which consists of a power grid analog source, a current detection module, a voltage detection module and a central controller, wherein a power factor compensation circuit is used for carrying out dynamic power factor compensation on a tested sample, so that the adaptability of the tested sample to a power supply grid can be checked, the detection of the normal abnormal characteristics of the power supply grid is realized, the three-phase harmonic generation module is used for simultaneously outputting the superimposed harmonic voltage with various frequencies to control, the independent control of PWM rectification and inversion is realized, the accuracy and the reliability of control logic are further ensured, the accurate control of harmonic times and amplitude is realized, and the potential safety hazard in the operation process of the system is reduced.
In order to solve the technical problems, the invention is solved by the following technical scheme:
The power grid simulation source system comprises a power grid simulation source connected to a power supply network, a current detection module for sampling current of the power grid simulation source, a voltage detection module for sampling voltage of the power grid simulation source, a central controller for controlling the system, and an upper computer connected with the central controller, wherein a tested sample is connected with the power grid simulation source through a first transformer, the current detection module and the voltage detection module are respectively connected to the central controller through a power factor compensation circuit, and the power grid simulation source, the first transformer and the tested sample are all connected with the central controller. Through the arrangement of the power factor compensation circuit, the power factor can reach 0.95, the harmonic current content is lower than 3% FS, and the interference to a power supply grid is small.
Preferably, the power factor compensation circuit comprises a voltage stabilizing power supply, a power factor compensation main circuit, a PWM pulse modulation and drive control circuit and a phase current voltage detection and comparison circuit which are connected with each other, wherein the voltage stabilizing power supply supplies power to the circuit, the power factor compensation main circuit comprises a first filter inductor, a second filter inductor, a first filter capacitor, a second filter capacitor, a third filter capacitor, a charge-discharge capacitor, an absorption capacitor, a coupling capacitor, a second transformer, a current detection resistor, a first voltage detection resistor, a second voltage detection resistor, a first power switching element and a second power switching element, one end of the first filter inductor is connected with an input end L of alternating current, the other end of the first filter inductor is connected with one end of a charge-discharge capacitor, the first voltage detection resistor and the current detection resistor, the other end of the charge-discharge capacitor is connected with one end of a primary winding N1 of the second transformer, the other end of the primary winding N1 of the second transformer is connected with a first power switching element and a second power switching element which are connected in parallel, the cathode of the first power switching element and anode of the second power switching element are connected with a public end N of the alternating current, one end of the first power switching element and the second power switching element are connected with the first end of the first power switching element and the second power switching element respectively, one end of the first filter inductor is connected with the first end of the first filter capacitor and the drive circuit is connected with one end of the first filter capacitor, the other end of the first voltage detection resistor is respectively connected with a voltage detection circuit of the phase current voltage detection and comparison circuit and one end of the second voltage detection resistor, the other end of the second voltage detection resistor is connected with the common end N of the alternating current, the other end of the current detection resistor is connected with the output end LM of the alternating current through a second filter inductor, the absorption capacitor is connected with the secondary winding N2 of the second transformer in parallel, one end of the absorption capacitor is connected with the output end LM of the alternating current, the other end of the absorption capacitor is connected with one end of the coupling capacitor, the other end of the coupling capacitor is connected with the common end N of the alternating current, one end of the third filter capacitor and one end of a measured sample are respectively connected with the output end LM of the alternating current, and the other ends of the third filter capacitor and the measured sample are respectively connected with the common end N of the alternating current. When the power factor compensation circuit works, alternating Current (AC) is input to the input end L and the public end N of the power factor compensation main circuit, the AC is supplied to a circuit consisting of a charge-discharge capacitor, a primary winding N1 of a second transformer, a first power switching element and a second power switching element through a first filter capacitor, a first filter inductor and a second filter capacitor, and then is supplied to a sample to be tested after being filtered through a current detection resistor, a second filter inductor and a third filter capacitor;
Specifically, after the voltage detection circuit of the phase current voltage detection and comparison circuit divides the voltage through the first voltage detection resistor and the second voltage detection resistor in the power factor compensation main circuit, the terminal voltage of the tested sample is detected; the current detection circuit detects the current flowing through the tested sample through the current detection resistor, then transmits the detected voltage and current waveform to the current and voltage comparison circuit for comparison, controls the PWM pulse modulation circuit in the PWM pulse modulation and drive control circuit to control the drive circuit and the isolation drive circuit through the control voltage, respectively carries out switch control on the first power switch element and the second power switch element, the phase detection circuit processes the voltage waveform detected by the voltage detection circuit, then transmits the processed voltage waveform to the phase and automatic power factor control circuit in the PWM pulse modulation and drive control circuit, the phase and automatic power factor control circuit controls the on-off sequence of the first power switch element and the second power switch element through the PWM pulse modulation circuit, the first winding N1 of the second transformer carries out pulse charging on the charge-discharge capacitor in the period of 0-pi/2 pi, carries out pulse discharging on the charge-discharge capacitor in the period of 3 pi/2 pi, carries out pulse discharging on the charge-discharge capacitor in the period of pi-3/2 pi, when the phase factor control circuit is lower than the current and the current is compared with the current in the PWM pulse modulation and voltage comparison circuit, the method comprises the steps of respectively controlling on-off time of a first power switch element and a second power switch element through a first driving circuit and an isolation driving circuit, further controlling on-off time of a primary winding N1 of a second transformer and a charge-discharge capacitor, adjusting charge quantity of the charge-discharge capacitor through adjusting PWM pulse width, namely on-off time, of the first power switch element and the second power switch element when the first power switch element and the second power switch element are respectively turned on and off in a pulse width of 0-pi/2 and pi-3/2 pi period, adjusting discharge quantity of the charge-discharge capacitor through adjusting PWM on-off time of the first power switch element and the second power switch element, adjusting charge-discharge quantity of the compensation charge-discharge capacitor to be equivalent to adjusting capacitance value of the compensation charge-discharge capacitor, further realizing dynamic compensation, storing electric energy in a first filter inductor when the first power switch element and the second power switch element are respectively turned on, storing electric energy in the first filter inductor when the first power switch element passes through the primary winding N1 of the first filter inductor, the charge-discharge capacitor and the second transformer, and correcting the second power factor of the second filter inductor, and releasing the electric energy in a sample through the second filter inductor and the second filter capacitor, and correcting the power factor of the second filter capacitor, and then releasing the electric energy in the second filter capacitor and the second filter capacitor, and correcting the sample, and the sample is released after the second sample is subjected to power factor correction.
The three-phase harmonic source comprises a detection module, a harmonic generator for outputting harmonic voltage, and a PWM controller for controlling the voltage frequency and amplitude of the harmonic voltage output by the harmonic generator, wherein the harmonic generator is connected with the PWM controller, the PWM controller is connected with an upper computer, the harmonic generator comprises a first communication module, a relay output module, an analog output module and a three-phase harmonic generation module, the input end of the detection module is connected with a power supply grid, the output end of the detection module is connected with the upper computer, the upper computer is respectively connected with the input end of the relay output module and the input end of the analog output module through the first communication module, the output end of the relay output module and the output end of the analog output module are respectively connected with the three-phase harmonic generation module, the three-phase harmonic generation module is connected with the power supply grid, and the three-phase harmonic source is used for outputting the harmonic voltage, and can output higher harmonics of 2 to 50 times of three-phase harmonic, so that the three-phase harmonic generator can realize multiple parallel operation, and has the capacity of high anti-interference capacity, high running stability, high running data reliability, high running speed, and convenient and safe and fast running.
In the invention, the tested sample is connected to the harmonic generator through the third transformer, the third transformer performs voltage conversion on the harmonic voltage output by the harmonic generator and transmits electric energy, so that the adaptability of the three-phase harmonic source in the process of testing the compensation capacity of the tested sample on the electric energy quality is improved.
The three-phase harmonic generation module comprises a PWM rectifier, a DC side energy storage capacitor and a PWM inverter, wherein the PWM rectifier, the DC side energy storage capacitor and the PWM inverter are used for establishing stable DC voltage, the PWM inverter is used for generating given voltage signals, the PWM rectifier, the DC side energy storage capacitor and the PWM inverter are sequentially connected, the output end of the front filter is connected with the input end of the PWM rectifier, the output end of the PWM inverter is connected with the rear filter, the output end of the PWM controller is respectively connected with the PWM rectifier and the PWM inverter, wherein a three-phase current waveform interface, a state monitoring display interface and a harmonic generation frequency setting interface are set and displayed through an upper computer, the three-phase harmonic generation module formed by combining the front filter, the harmonic power module and the rear filter is used for simultaneously outputting harmonic voltages with various frequencies through the PWM controller, so that the independent control of PWM rectification and inversion is achieved, the accuracy and the reliability of control logic are ensured, and the precise control of harmonic frequency and amplitude is realized.
Specifically, the pre-filter and the post-filter both adopt an RLC filtering mode, wherein the pre-filter and the post-filter both comprise filter inductors, filter resistors and filter capacitors which are connected with each other, the filter inductors are connected to the PWM rectifier in series, and the filter resistors and the filter capacitors are connected to the PWM rectifier in parallel after being connected in series.
In the invention, the three-phase harmonic generation module comprises an A-phase harmonic generation module, a B-phase harmonic generation module and a C-phase harmonic generation module which are identical in structure, wherein the A-phase harmonic generation module, the B-phase harmonic generation module and the C-phase harmonic generation module are all provided with three-phase harmonic generation circuits, the three-phase harmonic generation circuits comprise a state monitor, an alternating current contactor, a relay, a single-mode harmonic elimination circuit, a high-pass harmonic elimination circuit and an anti-parallel thyristor, the input end of the state monitor is connected with a power supply grid through a circuit breaker, the output end of the state monitor is connected with one end of a relay contact through the alternating current contactor, the other end of the relay contact is connected with one end of the single-mode harmonic elimination circuit or the high-pass harmonic elimination circuit, the other end of the single-mode harmonic elimination circuit or the other end of the high-pass harmonic elimination circuit is connected with one end of the anti-parallel thyristor, the other end of the anti-parallel thyristor is connected with an analog output module, the coil of the relay is connected with the relay output module, and the communication port of the state monitor is connected with the first communication module. The state monitor is mainly used for realizing state monitoring, interlocking function and zero crossing signal detection of each branch, and ensuring correct attraction and no inrush current switching of the relay and the alternating current contactor.
In the invention, a single resonance elimination circuit comprises a first resistor, a first reactor and a first capacitor which are connected in series.
In the invention, the high-pass resonance elimination circuit comprises a second resistor, a second reactor, a second capacitor and a third capacitor, wherein the third capacitor is connected with the second resistor in series and then connected with the second reactor in parallel to form a parallel branch, and the parallel branch is connected with the second capacitor in series.
Preferably, the PWM controller adopts a singlechip, the singlechip is provided with a dual-port parallel port RAM, the dual-port parallel port RAM is provided with a data input port, a data output port, an address input port and an address scanning port, and the data input port and the address input port of the dual-port parallel port RAM are connected to the singlechip;
Preferably, the singlechip is connected with a first 8-bit parallel port analog-to-digital converter and a second 8-bit parallel port analog-to-digital converter which are used for regulating amplitude, a data port of the first 8-bit parallel port analog-to-digital converter and a data port of the second 8-bit parallel port analog-to-digital converter are connected with the singlechip, and a REF port of the first 8-bit parallel port analog-to-digital converter and a REF port of the second 8-bit parallel port analog-to-digital converter are connected with an output of the reference module;
Preferably, the singlechip is also connected with a third 8-bit parallel port analog-to-digital converter and a fourth 8-bit parallel port analog-to-digital converter for controlling output waveforms, and the third 8-bit parallel port analog-to-digital converter and the fourth 8-bit parallel port analog-to-digital converter are connected to the singlechip through data output ports of the dual-port parallel port RAM;
Preferably, the output ports of the first 8-bit parallel port analog-to-digital converter and the second 8-bit parallel port analog-to-digital converter are respectively connected with the first operational amplifier array, the output end of the first operational amplifier array is respectively connected with the REF ports of the third 8-bit parallel port analog-to-digital converter and the fourth 8-bit parallel port analog-to-digital converter, the output ends of the third 8-bit parallel port analog-to-digital converter and the fourth 8-bit parallel port analog-to-digital converter are respectively connected with the second operational amplifier array, and the output end of the second operational amplifier array is connected with the harmonic generator.
In the invention, the singlechip writes waveform data into the dual-port parallel port RAM through the data input port and the address input port, establishes a waveform table, and can realize phase shift by different written addresses. The single chip microcomputer respectively transmits the high 8 bits and the low 8 bits of the amplitude signal to the first 8-bit parallel port analog-to-digital converter and the second 8-bit parallel port analog-to-digital converter, the first 8-bit parallel port analog-to-digital converter and the second 8-bit parallel port analog-to-digital converter calculate output voltages through the reference module and transmit the output voltages to the first operational amplifier array, and the first operational amplifier array transmits output values to REF ports of the third 8-bit parallel port analog-to-digital converter and the fourth 8-bit parallel port analog-to-digital converter through proportional accumulation, so that the amplitude of an output waveform is regulated.
In the invention, the singlechip writes the output waveform data into the dual-port parallel port RAM, writes the data at each moment into the third 8-bit parallel port analog-to-digital converter and the fourth 8-bit parallel port analog-to-digital converter, calculates the output voltage through the reference voltage of the REF port of the third 8-bit parallel port analog-to-digital converter and the fourth 8-bit parallel port analog-to-digital converter, and transmits the output voltage to the second operational amplifier array, thereby outputting the required waveform phase.
Preferably, the detection module comprises a current transformer and an analog-to-digital converter, wherein the input end of the current transformer is connected with a power supply grid, the output end of the current transformer is connected with the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is connected with the upper computer.
In the invention, the central controller is also connected with a reactive power simulation source for providing reactive power compensation signals, the three-phase harmonic source and the reactive power simulation source are connected with a tested sample in parallel through a third transformer, the reactive power simulation source is provided with a reactive power generator, the reactive power generator comprises a first reactor for storing energy and filtering high-frequency switch ripple current, a PWM converter for providing reactive power compensation signals in a three-phase full-control bridge topology mode and a second driving circuit, the first reactor is connected with a power supply grid through the third transformer, the alternating current side of the PWM converter is connected with the first reactor, the direct current side of the PWM converter is connected with an energy storage capacitor, and the PWM converter is connected to the central controller through the second driving circuit; the three-phase harmonic source and the reactive power analog source are connected in parallel with the tested sample through a third transformer, the third transformer performs voltage conversion on harmonic voltage output by the harmonic generator and transmits electric energy, the adaptability of the three-phase harmonic source in the process of checking the compensation capability of the tested sample on the electric energy quality is improved, the PWM converter is composed of insulated gate bipolar transistors, the insulated gate bipolar transistors are driven by a voltage space vector modulation technology to generate compensation current waveforms, the energy storage capacitor stores direct current energy generated by the insulated gate bipolar transistors, the second driving circuit receives a control signal sent by the central controller to drive the semiconductor power device of the PWM converter and also has the protection function of the semiconductor power device, the reactive power analog source can compensate reactive power, regulate three-phase imbalance and harmonic suppression, avoid the mutual interference problem, flexibly configure reactive power on line and effectively realize reasonable compensation of reactive power, providing security for system equipment installed in extremely limited space.
In the invention, a harmonic generator is arranged in a harmonic source cabinet, a singlechip is arranged in a harmonic control cabinet, a first transformer and a third transformer are respectively arranged in each transformer cabinet, a power grid simulation source, a harmonic source cabinet, a harmonic control cabinet, a reactive simulation source and a transformer cabinet are all arranged beside a tested sample, the tested sample is arranged on a test frame, a test frame is arranged on a wall surface, the test frame is provided with a wiring frame, the wiring frame is supported below a ceiling by a support frame, the support frame is fixedly arranged on the wall surface or the ceiling, the wiring frame is provided with a wire slot, a cable is buried in the wire slot, and the power grid simulation source, the harmonic source cabinet, the harmonic control cabinet, the reactive simulation source, the transformer cabinet and the tested sample are all connected with a power supply grid through cables. The installation structure formed by combining the support frame, the wiring frame and the test frame not only provides higher stability, firmness and balance capacity for installation and wiring of system equipment, but also enables the system to be compact in design and high in safety, and fully utilizes limited test space.
Preferably, the central controller is connected with a monitoring system for monitoring the operation of the system. The monitoring system comprises an electric energy quality analyzer for detecting the harmonic wave of a three-phase harmonic source and transmitting the detected harmonic value to a central controller, a temperature sensor for detecting a temperature signal of system equipment, a smoke sensor for detecting a smoke signal of the system equipment, a time monitoring module for monitoring the working state of the system, and an alarm module for alarming the system, wherein the alarm module is connected with an upper computer, the electric energy quality analyzer, the temperature sensor, the smoke sensor, the time monitoring module and the alarm module are all connected with the central controller, and the alarm module comprises a current-voltage alarm module for sending alarm information to alarm when the current value and/or the voltage value received by the central controller exceed the threshold value, a time alarm module for sending alarm information to alarm when the time value received by the central controller exceeds the threshold value, a temperature alarm module for sending alarm information to alarm when the temperature value received by the central controller exceeds the threshold value, a voltage alarm module for sending alarm information when the smoke concentration received by the central controller exceeds the threshold value, and the temperature alarm module, the harmonic module and the alarm module are all connected with the central controller.
In the invention, the monitoring system also comprises a second communication module which is respectively connected with the central controller and the alarm module, and the alarm information is transmitted to the upper computer through the second communication module.
In the invention, the monitoring system also comprises a data storage module connected with the central controller, the alarm information is stored through the data storage module, and the data storage module can also store the low-voltage energy quality detection data.
In the patent of the invention, the data storage module comprises a database server and a disk array which are connected with each other, the database server is connected with the central controller, the central controller stores alarm information into the disk array through the database server, and the upper computer reads the alarm information from the disk array. The data storage module formed by combining the database server and the disk array is combined with the technical scheme of the monitoring system, so that the reliability of the electric energy quality detection system is improved, the integrity and the accuracy of electric energy quality data are improved, different monitoring functions can be set according to monitoring requirements, an evaluation system is established by utilizing the data stored in the database server, the reliability of the low-voltage electric energy quality detection system is reversely pushed according to the quality of the data, the remote reliability evaluation of the low-voltage electric energy quality detection system is realized, the reliability of the system can be diagnosed and analyzed, and the system is correspondingly overhauled and maintained through the historical change trend of the reliability evaluation.
In the invention, the reactive power simulation source is provided with an RS485 interface, and the reactive power generator is connected with the central controller through the RS485 interface.
In the invention, the first transformer and the third transformer are respectively connected with a central controller through an RS485 interface.
The power grid simulation source system comprises a power grid simulation source, a current detection module, a voltage detection module and a central controller, and the power factor compensation circuit is used for carrying out dynamic power factor compensation on a tested sample, so that the adaptability of the tested sample to a power supply grid can be checked, the detection of the normal abnormal characteristics of the power supply grid is realized, the three-phase harmonic generation module is used for simultaneously outputting the harmonic voltage with multiple superimposed frequencies to control the three-phase harmonic generation module, the independent control of PWM rectification and inversion is realized, the accuracy and the reliability of control logic are further ensured, the precise control of harmonic times and amplitude is realized, the potential safety hazard in the operation process of the system is reduced, and the system has the advantages of strong anti-interference capability, high operation stability, accurate and reliable data test, high operation speed, high working efficiency, simple wiring, convenience in operation, safe operation process and the like.
Drawings
FIG. 1 is a schematic block diagram of an embodiment of a grid analog source system of the present invention.
Fig. 2 is a schematic circuit diagram of an embodiment of the power factor compensation circuit of the present invention.
Fig. 3 is a schematic block diagram of an embodiment of the reactive generator of the present invention.
Fig. 4 is a schematic circuit diagram of an embodiment of the reactive generator of the present invention consisting of a first reactor and a PWM converter.
Fig. 5 is a schematic block diagram of an embodiment of the present invention for detecting a sample to be tested by a three-phase harmonic source.
Fig. 6 is a schematic block circuit diagram of a three-phase harmonic source embodiment of the present invention.
Fig. 7 is a schematic circuit diagram of a three-phase harmonic generation circuit embodiment of the present invention.
Fig. 8 is a schematic circuit diagram of a main loop embodiment of a three-phase harmonic generation module according to the present invention.
Fig. 9 is a schematic block diagram of an embodiment of a PWM controller according to the present invention using a single-chip microcomputer.
Fig. 10 is a schematic structural diagram of an embodiment of the invention of a harmonic source cabinet, a harmonic control cabinet and a sample to be tested.
Fig. 11 is a d-axis current closed-loop feedback control block diagram of a PWM controller embodiment of the present invention.
FIG. 12 is a block diagram of the d-axis current closed-loop feedback control after feedforward decoupling of FIG. 11 using a feedforward decoupling algorithm.
Fig. 13 is a block diagram of the d-axis current closed-loop feedback control after simplifying fig. 12.
FIG. 14 is a block diagram of a decoupled d-axis current inner loop control of the present invention.
Fig. 15 is a d-axis current inner loop control block diagram after simplifying fig. 14.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
1-10, The power grid analog source system comprises a power grid analog source 3 connected to a power supply power grid 4, a current detection module 35 for sampling current of the power grid analog source 3, a voltage detection module 36 for sampling voltage of the power grid analog source 3, a central controller 15 for controlling the system, and a host computer 13 connected with the central controller 15, wherein a tested sample 1 is connected with the power grid analog source 3 through a first transformer 2, the current detection module 35 and the voltage detection module 36 are respectively connected with the central controller 15 through a power factor compensation circuit 34, the power grid analog source 3, the first transformer 2 and the tested sample 1 are connected with the central controller 15, and the power factor compensation circuit 34 comprises a stabilized voltage supply 344, a stabilized voltage supply 344, The power factor compensation main circuit 341, the PWM pulse modulation and drive control circuit 343, the phase current voltage detection and comparison circuit 342, and the regulated power supply 344 supplies power to the circuit, the power factor compensation main circuit 341 includes a first filter inductance 34109, a second filter inductance 34101, a first filter capacitor 34110, a second filter capacitor 34111, a third filter capacitor 34112, a charge-discharge capacitor 34107, an absorption capacitor 34113, a coupling capacitor 34114, a second transformer 34106, a current detection resistor 34102, a first voltage detection resistor 34103, a second voltage detection resistor 34103, a third filter capacitor, A second voltage detection resistor 34104, a first power switching element 34108, and a second power switching element 34105, one end of the first filter inductor 34109 is connected to the input terminal L of the alternating current, and the other end of the first filter inductor 34109 is connected to the charge/discharge capacitor 34107, the first voltage detection resistor 34103, One end of a current detection resistor 34102 is connected to one end of a charge-discharge capacitor 34107, the other end of the charge-discharge capacitor 34107 is connected to one end of a primary winding N1 of a second transformer 34106, the other end of the primary winding N1 of the second transformer 34106 is connected to a first power switching element 34108 and a second power switching element 34105 connected in parallel, a cathode of the first power switching element 34108 and an anode of the second power switching element 34105 are connected to a common end N of the alternating current, cathodes and drive poles of the first power switching element 34108 and the second power switching element 34105 are respectively connected to a first drive circuit 3434 and an isolation drive circuit 3432 of a PWM pulse modulation and drive control circuit 343, one end of a first filter capacitor 34110 is connected to an input end L of the alternating current, the other end of the first filter capacitor 34110 is connected to the common end N of the alternating current, one end of the second filter capacitor 34111 is connected to a first filter inductance 34109, the other end of the second filter capacitor 34111 is connected to the common end N of the alternating current, and the other end of the first voltage detection resistor 3403 is respectively connected to a voltage detection circuit 3423 of a phase current voltage detection and comparison circuit 342, One end of a second voltage detection resistor 34104 is connected, the other end of the second voltage detection resistor 34104 is connected to the common end N of the alternating current, the other end of the current detection resistor 34102 is connected to the output end LM of the alternating current through a second filter inductor 34101, an absorption capacitor 34113 is connected in parallel with the secondary winding N2 of the second transformer 34106, one end of the absorption capacitor 34113 is connected to the output end LM of the alternating current, the other end of the absorption capacitor 34113 is connected to one end of a coupling capacitor 34114, the other end of the coupling capacitor 34114 is connected to the common end N of the alternating current, a third filter capacitor 34112, one end of the tested sample 1 is respectively connected with the output end LM of the alternating current, and the other ends of the third filter capacitor 34112 and the tested sample 1 are respectively connected with the common end N of the alternating current. When the power factor compensation circuit works, alternating Current (AC) is input to the input end L and the public end N of the power factor compensation main circuit, the AC is supplied to a circuit consisting of a charge-discharge capacitor, a primary winding N1 of a second transformer, a first power switching element and a second power switching element through a first filter capacitor, a first filter inductor and a second filter capacitor, and then is supplied to a sample to be tested after being filtered through a current detection resistor, a second filter inductor and a third filter capacitor;
In the embodiment, the voltage detection circuit 3423 of the phase current voltage detection and comparison circuit divides the voltage of the terminal voltage of the sample to be detected through the first voltage detection resistor and the second voltage detection resistor in the power factor compensation main circuit, the current detection circuit 3421 detects the current flowing through the sample to be detected through the current detection resistor, processes the detected voltage and current waveform, and then transmits the processed voltage and current waveform to the current and voltage comparison circuit 3422 for comparison, the PWM pulse modulation circuit 3433 in the PWM pulse modulation and drive control circuit is controlled to control the first drive circuit 3434 and the isolation drive circuit 3432 through the control voltage, the first power switch element 34108 and the second power switch element 34105 are respectively controlled to switch, the phase detection circuit 3424 processes the voltage waveform detected by the voltage detection circuit 3423, and then transmits the processed voltage to the phase and automatic power factor control circuit 3431 through the PWM pulse modulation circuit 3433, The first driving circuit 3434 and the isolation driving circuit 3432 control the on-off sequence of the first power switching element 34108 and the second power switching element 34105, the primary winding N1 of the second transformer respectively controls the on-off time of the first power switching element and the second power switching element, and then controls the on-off time of the primary winding N1 of the second transformer and the charge-discharge capacitor in a period of 3 pi/2-2 pi, the charge-discharge capacitor is subjected to pulse discharge in a period of pi/2-pi, the charge-discharge capacitor is subjected to pulse charge in a period of pi-3/2 pi, when the power factor is lower than 1, the current and voltage in the phase current voltage detection and comparison circuit output constant voltage control PWM pulse modulation circuit in the drive control circuit, the on-off time of the first power switching element and the second power switching element is controlled by the first driving circuit and the isolation driving circuit respectively, and the on-off time of the second power switching element is controlled by the first driving circuit and the second driving circuit, and the on-off time of the second power switching element is controlled by the first winding N1 of the second transformer is controlled, when the charge-off time of the charge-discharge capacitor is pulse-on-off in a period of pi/2-2 pi and the pi-3/2 pi, the first power switching element and the second power switching element and the charge-off time of the charge-discharge capacitor is pulse-on-off in a period of 0 pi-3 pi/2 pi and the period is pulse-3 pi, the charge-2 charge-phase is adjusted by the charge-phase current and the second power switching element and the charge-phase voltage compensation element and the charge-phase voltage control element. So as to realize dynamic compensation, when the first power switch element and the second power switch element are respectively conducted, the current passes through the first filter inductance, When the primary winding N1 of the second transformer and the discharge capacitor are charged, electric energy is stored in the first filter inductor, when the first filter inductor is turned off, the electric energy stored in the first filter inductor is filtered by the second filter inductor and the third filter capacitor and then released, and the power factor of the tested sample is corrected, on the other hand, the electric energy stored in the second transformer is released through the secondary winding N2, the absorption capacitor and the coupling capacitor, and the power factor of the tested sample is corrected again.
In this embodiment, a three-phase harmonic source 5 for outputting harmonic voltages is connected to a sample 1 to be tested through a third transformer 37, the three-phase harmonic source 5 includes a detection module 53, a harmonic generator 52 for outputting harmonic voltages, and a PWM controller 51 for controlling the voltage frequency and amplitude of the harmonic voltages outputted from the harmonic generator 52, the harmonic generator 52 is connected to the PWM controller 51, the PWM controller 51 is connected to the host computer 13, the harmonic generator 52 includes a first communication module 524, a relay output module 522, an analog output module 523, and a three-phase harmonic generation module 521, an input end of the detection module 53 is connected to the power grid 4, an output end of the detection module 53 is connected to the host computer 13, the host computer 13 is connected to an input end of the relay output module 522 and an input end of the analog output module 523 through the first communication module 524, an output end of the relay output module 522 and an output end of the analog output module 523 are connected to the three-phase harmonic generation module 521, and the three-phase harmonic generation module 521 is connected to the power grid 4.
In this embodiment, the PWM controller 51 simulates the normal or abnormal characteristics of the three-phase balance or unbalance of the power supply network by using a three-phase decoupling algorithm, where the three-phase decoupling algorithm includes the following specific contents:
the PWM controller 51 input current is provided by the following equation (a):
The formula (A) shows that d and q-axis currents are mutually coupled, and the formula (A) is subjected to Laplace transformation and is arranged to obtain the following formula (B):
Taking i 1d as a controlled object and U 1d as output of the PWM controller 51, obtaining a d-axis current closed-loop feedback control block diagram shown in fig. 11 from a formula (B), deriving a calculation formula (C) of the current closed-loop controller output U 1d from the d-axis current closed-loop feedback control block diagram, wherein the calculation formula (C) is as follows:
The D-axis current and the q-axis current have symmetry, the D-axis current and the q-axis current are influenced by the disturbance of the network side voltage U 2d、U2q besides the influence of the control variable U 1d、U1q, the D-axis current and the q-axis current are mutually coupled to cause a certain difficulty to the design of the PWM controller 51, the influence of the difficulty on a system is effectively reduced by carrying out Laplacian transformation on the formula (A), as can be seen from fig. 11, the D-axis current is not only related to the current setting, but also influenced by the D-axis component disturbance of the q-axis current and the power supply network voltage, therefore, the influence of the D-axis component disturbance of the q-axis current and the power supply network voltage is eliminated by adopting a feedforward decoupling algorithm, a D-axis current inner loop closed-loop control block diagram adopting a feedforward decoupling algorithm is shown in fig. 12, and a calculation formula (D) of the closed loop controller output U 1d calculated by a feedforward decoupling algorithm is derived from the D-axis current inner loop closed-loop control block diagram:
The figure 12 is simplified to obtain the figure 13, and it can be seen from the figure 13 that after the disturbance of q-axis coupling current and power supply grid voltage is eliminated by adopting a feedforward decoupling algorithm, the current inner loop controlled object can be simplified into a simple first-order inertia link, and meanwhile, the disturbance voltage of the grid is introduced as feedforward compensation, so that the anti-interference capability of the system is greatly improved.
Specifically, a current controller C(s) is selected as the PI controller, and the transfer function of C(s) is as shown in the function (E):
wherein, The decoupled d-axis current inner loop control block diagram is shown in figure 14, T S is the current inner loop current sampling period, K PWM is the bridge PWM equivalent gain, and the small time constant is calculated by taking the delay of the current inner loop signal sampling and the small inertia characteristic of PWM control into considerationT S is combined to obtain a simplified decoupled d-axis current inner loop control block diagram as shown in fig. 15, and when the current inner loop is considered to obtain a faster current following performance, it can be seen from the simplified decoupled d-axis current inner loop control block diagram shown in fig. 15 that only the zero point of the designed PI regulator is required to offset the pole of the transfer function of the current control object, namely: The corrected current inner loop open loop transfer function is shown as function (F):
when the system damping ratio ζ=0.707 is taken, a calculation formula (G) can be obtained:
Solving the formula (G) to obtain a calculation formula (H) of the current inner loop PI regulation control parameter:
the current inner loop closed loop transfer function after decoupling is found from fig. 15 as shown in function (I):
when the switching frequency is sufficiently high, i.e., T S is sufficiently small, the S 2 term can be ignored because the S 2 term coefficient is much smaller than the S term coefficient, and the function (I) is reduced to the function (J):
Substituting the calculation formula (H) into the function (J) to obtain an equivalent transfer function with simplified current inner loop as shown in the function (K):
The function (K) shows that the current inner loop is approximately equivalent to an inertia link, the inertia time constant of the inertia link is 3T S, the current inner loop has faster dynamic response when the switching frequency is high enough, the point can be defined as the frequency bandwidth f b of the closed loop system when the closed loop gain of the closed loop control system is reduced to-3 dB or the phase shift of the closed loop control system is-45 DEG, and the calculation formula of the frequency bandwidth f bi of the current inner loop is shown as the formula (L) because the current inner loop can be equivalent to a first-order inertia link:
the formula (L) shows that the PWM controller designed by the invention not only meets the requirement of rapidity, but also has stronger inhibition capability on high-frequency interference such as switching frequency noise.
In this embodiment, the PWM controller 51 adopts a single-chip microcomputer 510, the single-chip microcomputer 510 is provided with a dual-port parallel port RAM19, the dual-port parallel port RAM19 has a data input port, a data output port, an address input port, and an address scanning port, the data input port and the address input port of the dual-port parallel port RAM19 are connected to the single-chip microcomputer 510, the single-chip microcomputer 510 is connected with a first 8-bit parallel port analog-to-digital converter 24 and a second 8-bit parallel port analog-to-digital converter 26 for specifying the amplitude, the data port of the first 8-bit parallel port analog-to-digital converter 24 and the data port of the second 8-bit parallel port analog-to-digital converter 26 are connected to the single-chip microcomputer 510, and the REF port of the first 8-bit parallel port analog-to-digital converter 24 and the REF port of the second 8-bit parallel port analog-to-digital converter 26 are connected to the output of the reference module 25.
In this embodiment, the single chip microcomputer 510 is further connected with a third 8-bit parallel port analog-to-digital converter 20 and a fourth 8-bit parallel port analog-to-digital converter 22 for controlling output waveforms, and the third 8-bit parallel port analog-to-digital converter 20 and the fourth 8-bit parallel port analog-to-digital converter 22 are connected to the single chip microcomputer 510 through data output ports of the dual-port parallel port RAM 19.
In this embodiment, the output ports of the first 8-bit parallel port analog-to-digital converter 24 and the second 8-bit parallel port analog-to-digital converter 26 are respectively connected with the first operational amplifier array 23, the output port of the first operational amplifier array 23 is respectively connected with the REF ports of the third 8-bit parallel port analog-to-digital converter 20 and the fourth 8-bit parallel port analog-to-digital converter 22, the output ports of the third 8-bit parallel port analog-to-digital converter 20 and the fourth 8-bit parallel port analog-to-digital converter 22 are respectively connected with the second operational amplifier array 21, and the output port of the second operational amplifier array 21 is connected with the harmonic generator 52.
In this embodiment, the single chip microcomputer writes waveform data into the dual-port parallel port RAM through the data input port and the address input port, establishes a waveform table, and can realize phase shifting with different written addresses. The single chip microcomputer respectively transmits the high 8 bits and the low 8 bits of the amplitude signal to the first 8-bit parallel port analog-to-digital converter and the second 8-bit parallel port analog-to-digital converter, the first 8-bit parallel port analog-to-digital converter and the second 8-bit parallel port analog-to-digital converter calculate output voltages through the reference module and transmit the output voltages to the first operational amplifier array, and the first operational amplifier array transmits output values to REF ports of the third 8-bit parallel port analog-to-digital converter and the fourth 8-bit parallel port analog-to-digital converter through proportional accumulation, so that the amplitude of an output waveform is regulated.
In this embodiment, the single chip microcomputer writes the output waveform data into the dual-port parallel port RAM, writes the data at each time point into the third 8-bit parallel port analog-to-digital converter and the fourth 8-bit parallel port analog-to-digital converter, calculates the output voltage by the reference voltages of the REF ports of the third 8-bit parallel port analog-to-digital converter and the fourth 8-bit parallel port analog-to-digital converter, and transmits the output voltage to the second op-amp array, thereby outputting the required waveform phase.
In this embodiment, the detection module 6 includes a current transformer 61 and an analog-to-digital converter 62, an input end of the current transformer 61 is connected with the power supply grid 4, an output end of the current transformer 61 is connected with an input end of the analog-to-digital converter 62, and an output end of the analog-to-digital converter 62 is connected with the upper computer 13.
In this embodiment, the central controller 15 is connected to a monitoring system for monitoring the operation of the system. The monitoring system comprises an electric energy quality analyzer 14 for detecting the harmonic wave of the three-phase harmonic source 5 and transmitting the detected harmonic wave value to a central controller 15, a temperature sensor 8 for detecting a temperature signal of system equipment, a smoke sensor 9 for detecting a smoke signal of the system equipment, a time monitoring module 10 for monitoring the working state of the system, and an alarm module 12 for alarming the system, wherein the three-phase harmonic source 5 and a reactive power simulation source 32 are connected with a tested sample 1 in parallel through a transformer 2, a power grid simulation source 3 is connected with a power supply power grid 4, the power grid simulation source 3 is connected with the tested sample 1 through the transformer 2, the alarm module 12 is connected with an upper computer 13, and the power grid simulation source 3, the three-phase harmonic source 5, the reactive power simulation source 32, the transformer 2, the tested sample 1, the electric energy quality analyzer 14, the temperature sensor 8, the smoke sensor 9, the time monitoring module 10 and the alarm module 12 are all connected with the central controller 15; the alarm module 12 includes a current-voltage alarm module 121 for giving an alarm information when a current value and/or a voltage value received by the central controller 15 exceeds a threshold value, a time alarm module 122 for giving an alarm information when a time value received by the central controller 15 exceeds a threshold value, a temperature alarm module 123 for giving an alarm information when a temperature value received by the central controller 15 exceeds a threshold value, a smoke alarm module 124 for giving an alarm information when a smoke concentration received by the central controller 15 exceeds a threshold value, a harmonic alarm module 125 for giving an alarm information when a harmonic value received by the central controller 15 exceeds a threshold value, a current-voltage alarm module 121, the time alarm module 122, the temperature alarm module 123, the smoke alarm module 124 and the harmonic alarm module 125 are all connected with the central controller 15.
In this embodiment, the three-phase harmonic generation module 521 is provided with a front filter 16, a harmonic power module 17 and a rear filter 18 which are sequentially connected, the harmonic power module 17 includes a PWM rectifier 171 for establishing a stable dc voltage, a dc side energy storage capacitor, and a PWM inverter 173 for generating a given voltage signal, the PWM rectifier 171, the dc side energy storage capacitor 172 and the PWM inverter 173 are sequentially connected, an output end of the front filter 16 is connected to an input end of the PWM rectifier 171, an output end of the PWM inverter 173 is connected to the rear filter 18, and an output end of the PWM controller 51 is connected to the PWM rectifier 171 and the PWM inverter 173, respectively. The three-phase harmonic generation module formed by combining a front filter, a harmonic power module and a rear filter is adopted, and the three-phase harmonic generation module is used for simultaneously outputting harmonic voltages with multiple superimposed frequencies to control through a PWM controller, so that independent control of PWM rectification and inversion is achieved, the accuracy and reliability of control logic are ensured, and precise control of harmonic times and amplitude is realized.
In this embodiment, the pre-filter and the post-filter both adopt RLC filtering modes, where the pre-filter and the post-filter each include a filter inductor, a filter resistor, and a filter capacitor that are connected with each other, the filter inductor is connected in series to the PWM rectifier, and the filter resistor and the filter capacitor are connected in series and then connected in parallel to the PWM rectifier.
In this embodiment, the three-phase harmonic generation module 521 includes an a-phase harmonic generation module 5211, a B-phase harmonic generation module 5212, and a C-phase harmonic generation module 5213, where the a-phase harmonic generation module, the B-phase harmonic generation module, and the C-phase harmonic generation module are all provided with a three-phase harmonic generation circuit 5210, the three-phase harmonic generation circuit includes a state monitor 52102, an ac contactor 52103, a relay 52104, a single-mode harmonic elimination circuit 52105, a high-pass harmonic elimination circuit 52107, and an anti-parallel thyristor 52106, an input end of the state monitor is connected to a power supply network through a circuit breaker 52101, an output end of the state monitor is connected to one end of a relay contact through an ac contactor, the other end of the relay contact is connected to one end of the single-mode harmonic elimination circuit or the high-pass harmonic elimination circuit, the other end of the single-mode harmonic elimination circuit is connected to one end of the anti-parallel thyristor, the other end of each branch anti-parallel thyristor is connected together, a trigger signal input end of the anti-parallel thyristor is connected to an analog output module, a coil of the state monitor is connected to a relay output module, and a port of the state monitor is connected to a first communication module. The state monitor is mainly used for realizing state monitoring, interlocking function and zero crossing signal detection of each branch, and ensuring correct attraction and no inrush current switching of the relay and the alternating current contactor.
In this embodiment, the single tuning cancellation circuit 52105 includes a first resistor 521053, a second reactor 521052, and a first capacitor 521051 connected in series.
In this embodiment, the high-pass detuning circuit 52107 includes a second resistor 521073, a third reactor 521071, a second capacitor 521072, and a third capacitor 521074, where the third capacitor is connected in series with the second resistor and then connected in parallel with the third reactor to form a parallel branch, and the parallel branch is connected in series with the second capacitor.
In this embodiment, the central controller 15 is further connected with a reactive power analog source 32 for providing reactive power compensation signals, the three-phase harmonic source 5 and the reactive power analog source 32 are connected in parallel with the tested sample 1 through a third transformer 37, the reactive power analog source 32 is provided with a reactive power generator 6, the reactive power generator 6 comprises a first reactor 61 for storing energy and filtering high-frequency switching ripple currents, a PWM converter 62 for providing reactive power compensation signals in a three-phase full-control bridge topology form, and a second driving circuit 64, the first reactor 61 is connected with the power supply grid 4 through the third transformer 37, the ac side of the PWM converter 62 is connected with the first reactor 61, the dc side of the PWM converter 62 is connected with an energy storage capacitor 63, and the PWM converter 62 is connected to the central controller 15 through the second driving circuit 64; the three-phase harmonic source and the reactive power analog source are connected in parallel with the tested sample through a third transformer, the third transformer performs voltage conversion on harmonic voltage output by the harmonic generator and transmits electric energy, the adaptability of the three-phase harmonic source in the process of checking the compensation capability of the tested sample on the electric energy quality is improved, the PWM converter is composed of insulated gate bipolar transistors, the insulated gate bipolar transistors are driven by a voltage space vector modulation technology to generate compensation current waveforms, the energy storage capacitor stores direct current energy generated by the insulated gate bipolar transistors, the second driving circuit receives a control signal sent by the central controller to drive the semiconductor power device of the PWM converter and also has the protection function of the semiconductor power device, the reactive power analog source can compensate reactive power, regulate three-phase imbalance and harmonic suppression, avoid the mutual interference problem, flexibly configure reactive power on line and effectively realize reasonable compensation of reactive power, providing security for system equipment installed in extremely limited space.
In this embodiment, the harmonic generator 52 is disposed in the harmonic source cabinet 30, the singlechip 510 is disposed in the harmonic control cabinet 31, the first transformer 2 and the third transformer 37 are respectively disposed in each transformer cabinet 31, the power grid analog source 3, the harmonic source cabinet 30, the harmonic control cabinet 31, the reactive analog source 32 and the transformer cabinet 31 are all disposed beside the tested sample 1, the tested sample 1 is disposed on the test rack 27, the test rack 27 is disposed on a wall surface, the test rack 27 is provided with the wiring rack 28, the wiring rack 28 is supported below a ceiling by the support rack 29, the support rack 29 is fixedly disposed on the wall surface or the ceiling, the wiring rack 28 is provided with the wire slots 280, the cable is buried in the wire slots 280, and the power grid analog source 3, the harmonic source cabinet 30, the harmonic control cabinet 31, the reactive analog source 32, the transformer 2 and the tested sample 1 are all connected with the power supply grid 4 through the cable. The installation structure formed by combining the support frame, the wiring frame and the test frame not only provides higher stability, firmness and balance capacity for installation and wiring of system equipment, but also enables the system to be compact in design and high in safety, and fully utilizes limited test space.
In this embodiment, the monitoring system further includes a second communication module 11, where the second communication module 11 is connected to the central controller 15 and the alarm module, and the alarm information is transmitted to the upper computer 13 through the second communication module 11.
In this embodiment, the monitoring system further includes a data storage module 7 connected to the central controller 15, and the alarm information is stored by the data storage module 7.
In this embodiment, the data storage module 7 includes a database server 71 and a disk array 72 that are connected to each other, the database server 71 is connected to the central controller 15, the central controller 15 stores the alarm information to the disk array 72 through the database server 71, and the host computer 13 reads the alarm information from the disk array 72. The data storage module formed by combining the database server and the disk array is combined with the technical scheme of the monitoring system, so that the reliability of the electric energy quality detection system is improved, the integrity and the accuracy of electric energy quality data are improved, different monitoring functions can be set according to monitoring requirements, an evaluation system is established by utilizing the data stored in the database server, the reliability of the low-voltage electric energy quality detection system is reversely pushed according to the quality of the data, the remote reliability evaluation of the low-voltage electric energy quality detection system is realized, the reliability of the system can be diagnosed and analyzed, and the system is correspondingly overhauled and maintained through the historical change trend of the reliability evaluation.
In this embodiment, the reactive power analog source 32 is provided with an RS485 interface, and the reactive power generator 6 is connected with the central controller 15 through the RS485 interface.
In this embodiment, the first transformer and the third transformer are respectively connected with the central controller 15 through an RS485 interface.
In summary, the foregoing description is only of the preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the claims should be construed to fall within the scope of the invention.
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