CN116488113A - Fault detection and control method and system for alternating current sensor of single-phase inverter - Google Patents
Fault detection and control method and system for alternating current sensor of single-phase inverter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/56—Testing of electric apparatus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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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
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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a fault detection and control method and system for an alternating current sensor of a single-phase inverter, and belongs to the field of inverter fault detection. The main method comprises the following steps: firstly, acquiring acquired direct current bus capacitor voltage, direct current side input instantaneous power, alternating current side output current, alternating current filter capacitor voltage and grid voltage, and then calculating a reconstructed alternating current through the acquired direct current side input instantaneous power, direct current bus capacitor voltage and alternating current filter capacitor voltage, thereby providing a smart, simple and practical reconstruction current algorithm; and then carrying out zero crossing smoothing treatment on the obtained reconstructed alternating current, carrying out difference and comparison judgment on the obtained reconstructed alternating current and the actually collected alternating current side output current, and if a fault is detected, carrying out corresponding shutdown protection. The invention can rapidly detect and realize protection shutdown when the alternating current sensor fails, the reconstructed alternating current is not influenced by nonlinear change of inductance, the modulation strategy and the power device, and the practicability is extremely strong.
Description
Technical Field
The invention belongs to the field of inverter fault detection, and particularly relates to a fault detection and control method and system for an alternating current sensor of a single-phase inverter.
Background
Along with the rapid development of power electronic technology and new energy, such as photovoltaic power stations, wind power generation fields and the like, a large number of grid-connected inverters are needed to realize that electric energy is fed into a traditional power grid, single-phase inverters are commonly used in low-power household photovoltaic grid-connected power generation or energy storage systems, and a typical application scene is a whole county roof distributed photovoltaic system, so that the high-reliability design of the inverters is more important.
The current grid-connected or off-grid control scheme of the inverter is that an alternating current side is mainly realized by controlling current of the inversion side or the grid-connected side, and when an alternating current sensor suddenly fails in the operation process of the inverter, the current waveform is distorted or even the inverter overflows and explodes due to the fact that feedback quantity of a control algorithm is wrong. For this purpose, there are many control schemes for implementing fault detection and protection functions of the current sensor. However, the existing scheme has the problems of complex algorithm, difficult practical engineering application and the like, has poor practicability, has higher precision requirement on an algorithm model, and has the influences of nonlinear changes such as switching tube voltage drop, dead zone errors, inductance parameters and the like in the operation process of an actual inverter, so that the observed alternating current has larger errors, and the control and protection of the inverter cannot be accurately realized under certain working conditions.
Disclosure of Invention
In view of the above problems, a first aspect of the present invention provides a fault detection and control method for an ac current sensor of a single-phase inverter, including the steps of:
s1, acquiring acquired t 1 Time and t 2 Time direct current bus capacitor voltage U dc And t 1 Time of day or t 2 Direct current at momentSide input instantaneous power P dcs Output current I at AC side ac Capacitor voltage U of AC filter c Grid voltage U g The method comprises the steps of carrying out a first treatment on the surface of the The U is dc 、P dcs 、I ac 、U c U and U g All are collected through corresponding collecting circuits;
s2, inputting instantaneous power P through the obtained direct current side dcs DC bus capacitor voltage U dc Capacitor voltage U of alternating current filter c Calculating a reconstructed alternating current I ac_calm The method comprises the steps of carrying out a first treatment on the surface of the First according to t 1 Time and t 2 Moment direct current bus capacitor voltage U dc Solving a capacitor energy storage energy difference dEc at two moments through a capacitor energy storage formula, and inputting instantaneous power P according to a direct current side dcs Output instantaneous power P from AC side ac The principle that the difference time integral of (a) is equal to the capacitor energy storage energy difference dEc is adopted, and meanwhile, the energy conservation law is utilized to solve the output instantaneous power P of the alternating current side ac Finally, the basic principle that the AC instantaneous power is equal to the AC instantaneous voltage multiplied by the AC instantaneous current is utilized to solve the reconstruction AC current I ac_calm ；
S3, for the reconstructed alternating current I obtained in S2 ac_calm Performing zero crossing smoothing to obtain reconstructed alternating current I after zero crossing ac_cal ；
S4, reconstructing alternating current I after the obtained zero crossing point processing ac_cal With the actually collected AC side output current I ac Performing difference processing to obtain a current residual I ac_diff Judgment of I ac_diff Whether the absolute value of (a) is greater than a set threshold value, and sending a corresponding signal Soff to the control unit;
and S5, the control unit judges whether the alternating current sensor fails according to the signal Soff, and if the alternating current sensor fails, the control unit generates a PWM driving signal to carry out shutdown protection.
Preferably, the specific process in step S2 is as follows:
first according to t 1 Time and t 2 Moment direct current bus capacitor voltage U dc Solving two moments by using a capacitance energy storage formulaThe capacitance energy storage energy difference dEc is calculated as follows:
then according to the direct current side input instantaneous power P dcs Instantaneous power P output from AC side ac The principle that the difference time integral of (a) is equal to the capacitor energy storage energy difference dEc is adopted, and meanwhile, the energy conservation law is utilized to solve the output instantaneous power P of the alternating current side ac The calculation formula is as follows:
finally, the basic principle that the AC instantaneous power is equal to the AC instantaneous voltage multiplied by the AC instantaneous current is utilized to solve the reconstruction AC current I ac_calm The calculation formula is as follows:
wherein U is dc1 And U dc2 Respectively t 1 Time sum t 2 Moment direct current bus capacitor C bus Voltage value at P ac Which is the instantaneous power output on the ac side.
Preferably, the zero crossing smoothing in step S3 uses a second-order generalized integrator SOGI pair I ac_calm Processing, wherein a calculation formula adopts a complex domain formula after Laplace transformation, and the complex domain formula is as follows:
wherein k is a gain coefficient, the gain coefficient is adjusted according to actual needs, ω is the frequency fundamental wave angular frequency, and s is the complex frequency.
Preferably, the control unit in S5 also simultaneously performs the following steps according to the acquired U g 、U dc And I ac The DC bus voltage control loop and the AC current control loop generate modulation signals, and the PWM generating and driving circuit generates PWM driving signals to drive the inverter to operate, so that energy balance and port voltage and current adjustment are realized.
A second aspect of the present invention provides a single-phase inverter alternating current sensor fault detection and control device, the device comprising at least one processor and at least one memory, the processor and the memory being coupled; the memory stores a computer program; the processor, when executing the computer program stored in the memory, causes the apparatus to implement the single-phase inverter alternating current sensor fault detection and control method as described in the first aspect.
A third aspect of the present invention provides a computer-readable storage medium having stored therein a program or instructions that, when executed by a processor, cause a computer to perform the single-phase inverter alternating current sensor fault detection and control method according to the first aspect.
The fourth aspect of the invention provides a fault detection and control system for an alternating current sensor of a single-phase inverter, which comprises the fault detection and control device for the alternating current sensor of the single-phase inverter according to the second aspect, and further comprises a direct-current side input instantaneous power acquisition circuit, a direct-current bus capacitor voltage acquisition circuit, a filter capacitor voltage acquisition circuit, an alternating-current inversion side current acquisition circuit and a PWM generation and driving circuit which are connected with the inverter, and further comprises a power grid voltage acquisition circuit connected with a power grid.
The invention has the beneficial effects that:
1. the fault detection and control method for the single-phase inverter alternating current sensor provided by the invention does not need to obtain alternating current filter inductance parameters, and the reconstructed alternating current is not influenced by nonlinear change of inductance.
2. The fault detection and control method for the single-phase inverter alternating current sensor provided by the invention does not need to compensate the voltage drop and dead zone of the switching tube, and the reconstructed alternating current is not influenced by a modulation strategy and a power device.
3. The fault detection and control method for the alternating current sensor of the single-phase inverter can rapidly detect and realize protection shutdown when the alternating current sensor breaks down.
4. The fault detection and control method for the alternating current sensor of the single-phase inverter is mainly suitable for single-phase inverters, ingenious and simple in algorithm design, high in practical applicability and suitable for large-scale popularization.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of an overall fault detection and control system of the present invention.
Fig. 2 is a schematic diagram of the overall structure of a single-phase grid-connected inverter with an LCL filter according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of an ac current reconstruction waveform and a residual waveform under a non-linear disturbance-free condition according to the present invention.
Fig. 4 is a schematic diagram of ac current reconstruction and residual waveforms when the filter inductance of the present invention attenuates by 50% and the resistance measurement error is 50%.
FIG. 5 is a schematic diagram of the AC current reconstruction and residual waveform after adding the tube voltage drop and dead zone effects according to the present invention.
Fig. 6 is a schematic diagram of the inverter output current variation and the system protection waveform when the ac current sensor of the inverter has a short circuit fault.
Fig. 7 is a schematic block diagram of a simple structure of the single-phase inverter ac current sensor fault detection and control apparatus of the present invention.
Detailed Description
Example 1:
this embodiment will be further described with reference to fig. 1 to 6.
As shown in fig. 1, in order to implement the fault detection and control method of the ac current sensor of the single-phase inverter of the present invention, the adopted system structure includes a dc side input instantaneous power acquisition circuit, a dc bus capacitor voltage acquisition circuit, a filter capacitor voltage acquisition circuit, an ac inversion side current acquisition circuit, a PWM generation and driving circuit, which are connected with the inverter, and a power grid voltage acquisition circuit connected with a power grid, wherein the main part is detection and control equipment (a device) which includes an ac current reconstruction module, a reconstruction current zero crossing point processing module, a sensor fault judgment and protection module, and a control unit. Fig. 2 is a schematic diagram of the overall structure of a single-phase grid-connected inverter with LCL filters, and the method of the present invention is equally applicable to other ac filters, but is not limited to single-phase inverters.
The invention relates to a fault detection and control method for an alternating current sensor of a single-phase inverter, which mainly comprises the following steps.
Step one, acquiring an acquired t 1 Time and t 2 Time direct current bus capacitor voltage U dc And t 1 Time of day or t 2 The instantaneous power P is input on the DC side at the moment dcs Output current I at AC side ac Capacitor voltage U of AC filter c Grid voltage U g Regarding t 1 Time and t 2 The time interval is short, and the direct current side input instantaneous power P can be approximately considered dcs Output current I at AC side ac Capacitor voltage U of AC filter c Grid voltage U g The values of (2) are equal at both instants; u (U) dc 、P dcs 、I ac 、U c U and U g All are collected through corresponding collecting circuits.
Step two, inputting instantaneous power P through the obtained direct current side dcs DC bus capacitor voltage U dc And communicationCapacitor voltage U of filter c Calculating a reconstructed alternating current I ac_calm 。
First according to t 1 Time and t 2 Moment direct current bus capacitor voltage U dc The capacitance energy storage difference dEc at two moments is solved through a capacitance energy storage formula, and the calculation formula is as follows:
then according to the direct current side input instantaneous power P dcs Instantaneous power P output from AC side ac The principle that the difference time integral of (a) is equal to the capacitor energy storage energy difference dEc is adopted, and meanwhile, the energy conservation law is utilized to solve the output instantaneous power P of the alternating current side ac The calculation formula is as follows:
finally, the basic principle that the AC instantaneous power is equal to the AC instantaneous voltage multiplied by the AC instantaneous current is utilized to solve the reconstruction AC current I ac calm The calculation formula is as follows:
wherein U is dc1 And U dc2 Respectively t 1 Time sum t 2 Moment direct current bus capacitor C bus Voltage value at P ac Which is the instantaneous power output on the ac side.
The current reconstruction process in the second step is one of the most important invention points, and compared with the prior art, the current reconstruction process is ingenious in design, simple in algorithm and easy to put into practical engineering application.
Step three, the reconstructed alternating current I obtained in the step two is subjected to ac_calm Performing zero crossing smoothing to obtain reconstructed alternating current I after zero crossing ac_cal The method comprises the steps of carrying out a first treatment on the surface of the The process can adopt a filter or other digital processing modes, the invention prefers a second-order generalized integrator SOGI, and a calculation formula adopts a complex domain formula after Laplacian transformation, as follows:
wherein k is a gain coefficient, the larger the gain coefficient is, the faster the filtering response is, the worse the filtering effect is, the adjustment is carried out according to actual needs, ω is the frequency fundamental wave angular frequency, and s is the complex frequency.
Step four, the obtained reconstructed alternating current I after zero crossing point processing ac_cal With the actually collected AC side output current I ac Performing difference processing to obtain a current residual I ac_diff Judgment of I ac_diff Whether the absolute value of (a) is larger than a set threshold Th, and sends a corresponding signal Soff to the control unit; if so, a protection shutdown signal soff=1 is generated and sent, otherwise soff=0.
And fifthly, the control unit judges whether the alternating current sensor fails according to the signal Soff, and if the alternating current sensor fails, the control unit generates a PWM driving signal to carry out shutdown protection.
The control unit also obtains U according to the obtained U g 、U dc And I ac The DC bus voltage control loop and the AC current control loop generate modulation signals, and the PWM generating and driving circuit generates PWM driving signals to drive the inverter to operate, so that energy balance and port voltage and current adjustment are realized.
U dc Is a feedback signal of a direct-current voltage control loop, and is a direct-current voltage given value and U dc A given signal of the ac current control loop generated by the dc voltage control loop is transmitted to the ac current control loop, I ac For feedback signal of ac control loop, ac current controlGiven signal and I of loop ac Signal generated by ac current controller and U g And the superposition generated modulation signal is transmitted to a PWM generation and driving circuit to generate a PWM driving signal to drive the inverter to operate.
FIG. 3 shows the reconstructed waveform and residual waveform of the alternating current without nonlinear disturbance, which can be seen as the reconstructed current I after zero crossing processing under ideal conditions ac_cal Sampling AC side output current I with actual sensor ac Current residual I of (2) ac_diff Less than 1A, high reconstruction accuracy and reconstruction current I after zero crossing point processing ac_cal Output current I from actual AC side ac Substantially coincident.
I in FIGS. 3 to 6 ac Are all actual AC side output current waveforms, and are combined with the digital sampled I ac Except that the actual ac current waveform has an inductor current ripple, and the ac current ripple after digital sampling is filtered.
FIG. 4 shows the AC current reconstruction and residual waveform when the filter inductance is attenuated by 50% and the resistance measurement error is 50%, when the filter inductance is attenuated to 50% and the inductance equivalent impedance is reduced by 50%, the actual AC side output current I can be seen ac The current high-frequency ripple of (2) has become large, but does not affect the accuracy of current reconstruction, its current residual I ac_diff Still less than 1A, the reconstruction precision is high, and the fault detection precision can be ensured;
FIG. 5 is a graph showing the AC current reconstruction and residual waveforms after the tube voltage drop and dead zone effects are added, and the AC side output current I after the upper switch tube voltage drop and dead zone effects are considered ac Obvious distortion occurs, and the reconstructed current I after zero crossing point processing is obtained by adopting the current reconstruction method ac_cal High precision, the generated current residual I ac_diff Less than 2A meets the requirement of fault detection;
FIG. 6 is a graph showing the inverter output current variation and system protection waveforms when the AC current sensor of the inverter has a short circuit fault, and the reconstructed current I after zero crossing processing ac_cal Ac side output power with actual samplingStream I ac Comparing when the current residual is ac_diff When the threshold Th is exceeded, the system is stopped, the protection threshold in the picture is set to 5A, and when the current sensor has short circuit fault, the actual current I is seen ac The system triggers fault protection after rising to about 14A, so that the fault of an alternating current sensor can be effectively detected, and the damage of the inverter due to continuous overcurrent of the system can be prevented.
Example 2:
as shown in fig. 7, the present invention also provides a single-phase inverter ac current sensor fault detection and control device, which includes at least one processor and at least one memory, and also includes a communication interface and an internal bus; the memory stores computer executing program; the processor, when executing the execution program stored in the memory, causes the apparatus to execute the single-phase inverter alternating current sensor fault detection and control method as described in embodiment 1. Wherein the internal bus may be an industry standard architecture (Industry Standard Architecture, ISA) bus, an external device interconnect (Peripheral Component, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, the buses in the drawings of the present application are not limited to only one bus or one type of bus. The memory may include a high-speed RAM memory, and may further include a nonvolatile memory NVM, such as at least one magnetic disk memory, and may also be a U-disk, a removable hard disk, a read-only memory, a magnetic disk, or an optical disk. The device may be provided as a terminal, server or other form of device.
Fig. 7 is a block diagram of an apparatus shown for illustration. The device may include one or more of the following components: a processing component, a memory, a power component, a multimedia component, an audio component, an input/output (I/O) interface, a sensor component, and a communication component. The processing component generally controls overall operation of the electronic device, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component may include one or more processors to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component may include one or more modules that facilitate interactions between the processing component and other components. For example, the processing component may include a multimedia module to facilitate interaction between the multimedia component and the processing component.
The memory is configured to store various types of data to support operations at the electronic device. Examples of such data include instructions for any application or method operating on the electronic device, contact data, phonebook data, messages, pictures, videos, and the like. The memory may be implemented by any type of volatile or nonvolatile memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
The power supply assembly provides power to the various components of the electronic device. Power components may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for electronic devices. The multimedia assembly includes a screen between the electronic device and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia assembly includes a front camera and/or a rear camera. When the electronic device is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.
The audio component is configured to output and/or input an audio signal. For example, the audio component includes a Microphone (MIC) configured to receive external audio signals when the electronic device is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal may be further stored in a memory or transmitted via a communication component. In some embodiments, the audio assembly further comprises a speaker for outputting audio signals. The I/O interface provides an interface between the processing assembly and a peripheral interface module, which may be a keyboard, click wheel, button, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.
The sensor assembly includes one or more sensors for providing status assessment of various aspects of the electronic device. For example, the sensor assembly may detect an on/off state of the electronic device, a relative positioning of the assemblies, such as a display and keypad of the electronic device, a change in position of the electronic device or one of the assemblies of the electronic device, the presence or absence of user contact with the electronic device, an orientation or acceleration/deceleration of the electronic device, and a change in temperature of the electronic device. The sensor assembly may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. The sensor assembly may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly may further include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component is configured to facilitate communication between the electronic device and other devices in a wired or wireless manner. The electronic device may access a wireless network based on a communication standard, such as WiFi,2G, or 3G, or a combination thereof. In one exemplary embodiment, the communication component receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component further comprises a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the electronic device may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for executing the methods described above.
Example 3:
the present invention also provides a non-volatile computer-readable storage medium having stored therein a program or instructions that, when executed by a processor, cause a computer to perform the single-phase inverter alternating current sensor fault detection and control method as described in embodiment 1.
In particular, a system, apparatus or device provided with a readable storage medium on which a software program code implementing the functions of any of the above embodiments is stored and whose computer or processor is caused to read and execute instructions stored in the readable storage medium may be provided. In this case, the program code itself read from the readable medium may implement the functions of any of the above-described embodiments, and thus the machine-readable code and the readable storage medium storing the machine-readable code form part of the present invention.
The storage medium may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks (e.g., CD-ROM, CD-R, CD-RW, DVD-20ROM, DVD-RAM, DVD-RW), magnetic tape, and the like. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
It should be understood that the above processor may be a central processing unit (english: central Processing Unit, abbreviated as CPU), or may be other general purpose processors, digital signal processors (english: digital Signal Processor, abbreviated as DSP), application specific integrated circuits (english: application Specific Integrated Circuit, abbreviated as ASIC), or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in a processor for execution.
It should be understood that a storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an application specific integrated circuit (Application Specific Integrated Circuits, ASIC for short). The processor and the storage medium may reside as discrete components in a terminal or server.
The computer readable program instructions described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.
Computer program instructions for performing the operations of the present disclosure can be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, c++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present disclosure are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information of computer readable program instructions, which can execute the computer readable program instructions.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
While the foregoing describes the embodiments of the present invention, it should be understood that the present invention is not limited to the embodiments, and that various modifications and changes can be made by those skilled in the art without any inventive effort.
Claims (7)
1. The fault detection and control method for the alternating current sensor of the single-phase inverter is characterized by comprising the following steps of:
s1, acquiring acquired t 1 Time and t 2 Time direct current bus capacitor voltage U dc And t 1 Time of day or t 2 The instantaneous power P is input on the DC side at the moment dcs Ac side outputCurrent I ac Capacitor voltage U of AC filter c Grid voltage U g The method comprises the steps of carrying out a first treatment on the surface of the The U is dc 、P dcs 、I ac 、U c U and U g All are collected through corresponding collecting circuits;
s2, inputting instantaneous power P through the obtained direct current side dcs DC bus capacitor voltage U dc Capacitor voltage U of alternating current filter c Calculating a reconstructed alternating current I ac_calm The method comprises the steps of carrying out a first treatment on the surface of the First according to t 1 Time and t 2 Moment direct current bus capacitor voltage U dc Solving a capacitor energy storage energy difference dEc at two moments through a capacitor energy storage formula, and inputting instantaneous power P according to a direct current side dcs Output instantaneous power P from AC side ac The principle that the difference time integral of (a) is equal to the capacitor energy storage energy difference dEc is adopted, and meanwhile, the energy conservation law is utilized to solve the output instantaneous power P of the alternating current side ac Finally, the basic principle that the AC instantaneous power is equal to the AC instantaneous voltage multiplied by the AC instantaneous current is utilized to solve the reconstruction AC current I ac_calm ；
S3, for the reconstructed alternating current I obtained in S2 ac_calm Performing zero crossing smoothing to obtain reconstructed alternating current I after zero crossing ac_cal ；
S4, reconstructing alternating current I after the obtained zero crossing point processing ac_cal With the actually collected AC side output current I ac Performing difference processing to obtain a current residual I ac_diff Judgment of I ac_diff Whether the absolute value of (a) is greater than a set threshold value, and sending a corresponding signal Soff to the control unit;
and S5, the control unit judges whether the alternating current sensor fails according to the signal Soff, and if the alternating current sensor fails, the control unit generates a PWM driving signal to carry out shutdown protection.
2. The fault detection and control method of a single-phase inverter ac current sensor according to claim 1, wherein the specific process in step S2 is as follows:
first according to t 1 Time and t 2 Time of dayDC bus capacitor voltage U dc The capacitance energy storage difference dEc at two moments is solved through a capacitance energy storage formula, and the calculation formula is as follows:
then according to the direct current side input instantaneous power P dcs Instantaneous power P output from AC side ac The principle that the difference time integral of (a) is equal to the capacitor energy storage energy difference dEc is adopted, and meanwhile, the energy conservation law is utilized to solve the output instantaneous power P of the alternating current side ac The calculation formula is as follows:
finally, the basic principle that the AC instantaneous power is equal to the AC instantaneous voltage multiplied by the AC instantaneous current is utilized to solve the reconstruction AC current I ac_calm The calculation formula is as follows:
wherein U is dc1 And U dc2 Respectively t 1 Time sum t 2 Moment direct current bus capacitor C bus Voltage value at P ac Which is the instantaneous power output on the ac side.
3. The fault detection and control method as claimed in claim 1, wherein the zero crossing smoothing in step S3 is implemented by using a second-order generalized integrator SOGI to I ac_calm Processing, wherein the calculation formula adopts Laplacian transformationThe complex domain formula is as follows:
wherein k is a gain coefficient, the gain coefficient is adjusted according to actual needs, ω is the frequency fundamental wave angular frequency, and s is the complex frequency.
4. The single-phase inverter ac current sensor fault detection and control method of claim 1, wherein: the control unit in S5 also obtains U according to the obtained U g 、U dc And I ac The DC bus voltage control loop and the AC current control loop generate modulation signals, and the PWM generating and driving circuit generates PWM driving signals to drive the inverter to operate, so that energy balance and port voltage and current adjustment are realized.
5. A single-phase inverter alternating current sensor fault detection and control device is characterized in that: the apparatus includes at least one processor and at least one memory, the processor and the memory coupled; the memory stores a computer program; the processor, when executing the computer program stored in the memory, causes the apparatus to implement the single-phase inverter alternating current sensor fault detection and control method as claimed in any one of claims 1 to 4.
6. A computer-readable storage medium, wherein a program or instructions is stored in the computer-readable storage medium, which when executed by a processor, causes a computer to perform the single-phase inverter alternating current sensor fault detection and control method according to any one of claims 1 to 4.
7. A fault detection and control system of a single-phase inverter alternating current sensor is characterized in that: the fault detection and control device for the alternating current sensor of the single-phase inverter comprises the direct-current side input instantaneous power acquisition circuit, the direct-current bus capacitor voltage acquisition circuit, the filter capacitor voltage acquisition circuit, the alternating-current inversion side current acquisition circuit and the PWM generation and driving circuit which are connected with the inverter, and further comprises a power grid voltage acquisition circuit connected with a power grid.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117075027A (en) * | 2023-10-16 | 2023-11-17 | 江苏纳通能源技术有限公司 | CT transformer fault identification method and identification system thereof |
| CN117388569A (en) * | 2023-12-11 | 2024-01-12 | 浙江宏仁电气有限公司 | Electric energy metering method, electric energy metering box and medium under waveform distortion of power grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117075027A (en) * | 2023-10-16 | 2023-11-17 | 江苏纳通能源技术有限公司 | CT transformer fault identification method and identification system thereof |
| CN117075027B (en) * | 2023-10-16 | 2024-01-26 | 江苏纳通能源技术有限公司 | CT transformer fault identification method and identification system thereof |
| CN117388569A (en) * | 2023-12-11 | 2024-01-12 | 浙江宏仁电气有限公司 | Electric energy metering method, electric energy metering box and medium under waveform distortion of power grid |
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