Method and system for comprehensively testing, analyzing and verifying vector states of primary and secondary loops of transformer substation

Abstract

The invention discloses a transformer substation primary and secondary loop vector state comprehensive test, analysis and verification method and system, and relates to the technical field of transformer substation primary and secondary loop verification, and the method comprises the steps that a PC issues a control instruction to a current source module and a voltage source module through a wireless communication data concentrator, and provides a synchronization signal through a wireless reference source module; a current signal of the current source module is applied to the primary side of the CT, a voltage signal of the voltage source module is applied to the primary side of the PT, and the wireless volt-ampere phase instrument slave modules deployed on the secondary sides of the CT and the PT synchronously measure the amplitudes and phases of the voltage and the current and upload the amplitudes and the phases to the data concentrator through wireless communication; and the PC receives the current and voltage data measured by the secondary side, and compares and analyzes the current and voltage data with the current and voltage values primarily set by the control instruction to verify the correctness of the secondary circuit wiring of the transformer substation relay protection and automatic device. According to the method disclosed by the invention, the PC is used for comparing and analyzing the acquired data, so that the phase and polarity of the wiring are ensured to be correct.

Description

Technical Field

[0001] The present invention relates to the technical field of primary and secondary circuit verification of a substation, and in particular to a method and system for comprehensive testing, analyzing and verifying vector states of primary and secondary circuits of a substation. Background Art

[0002] In the development of power systems, with the rapid progress of smart grid and automation technology, relay protection devices and automatic control equipment in substations have gradually tended to be high-precision and high-reliability. As a key test link in substations, the wiring correctness of primary and secondary circuits and the direction verification of relay protection are directly related to the stability of the system. Traditionally, the testing and verification of primary and secondary circuits often rely on the test method under load. By measuring the amplitude and phase relationship of secondary voltage and current, it is determined whether the wiring of the equipment is correct. However, these methods can usually only be carried out after the equipment is energized with load. Not only is it dependent on the load, but also when the load current is insufficient or the polarity of the equipment is wrong, it is easy to cause protection malfunction, thereby affecting the safety and reliability of power grid operation. Therefore, a substation primary and secondary circuit verification method that can be used under non-load conditions and meet actual operation requirements is proposed, which has important engineering value.

[0003] However, existing testing methods have many shortcomings in achieving synchronous verification of the entire system. Traditional methods must rely on load current, and cannot complete phasor measurement when the primary equipment load is too small or there is no load, resulting in limited practical applications. Since traditional methods rely on multiple access and measurements of the secondary circuit, the frequently accessed secondary voltage and current increase the risk of short circuit or open circuit, and even increase the risk of electric shock to workers. Existing large current source equipment generally uses a combination of autocoupler voltage regulator and current booster, resulting in a large system size, inconvenient to carry, and the output frequency and phase cannot be adjusted, which cannot meet the needs of multi-point synchronous measurement. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problems solved by the present invention are: the primary and secondary circuit verification method of the substation has a strong dependence on load current, high risk of frequent wiring connections, large size of the verification equipment and non-frequency adjustment, as well as how to achieve multi-point synchronous measurement and circuit verification under non-load conditions.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a method for comprehensive testing, analyzing and verifying the vector states of primary and secondary circuits of a substation, comprising a PC issuing control instructions to a current source module and a voltage source module through a wireless communication data concentrator, and providing a synchronization signal through a wireless reference source module; the current signal of the current source module is applied to the primary side of the CT, the voltage signal of the voltage source module is applied to the primary side of the PT, and the wireless volt-ampere phase meter slave module deployed on the secondary side of the CT and PT synchronously measures the amplitude and phase of the voltage and current, and uploads them to the data concentrator through wireless communication; the PC receives the current and voltage data measured on the secondary side, and compares and analyzes them with the current and voltage values ​​set by the control instruction, so as to verify the correctness of the secondary circuit wiring of the substation relay protection and automatic device.

[0007] As a preferred solution of the method for comprehensive testing, analyzing and verifying the vector status of the primary and secondary circuits of a substation described in the present invention, the PC includes a PC connected to a data concentrator via a USB data cable, controlling different current source modules and voltage source modules to output primary voltage and current, and simultaneously receiving the secondary side voltage and current data of multi-point slaves transmitted by the data concentrator for display and analysis; the multi-point slaves and the wireless communication data concentrator communicate with each other through an Internet of Things card 4G module, and are synchronized through a GPS module and a wireless reference source broadcast synchronization signal; the PC is connected to the data concentrator via a USB data cable to issue control instructions.

[0008] As a preferred solution of the method for comprehensive testing, analyzing and verifying the vector state of the primary and secondary circuits of the substation described in the present invention, the current source module includes a large current with adjustable phase angle and amplitude generated by taking a three-phase AC380V power supply from the station, with DSP+FPGA as the control core, and the periphery is supplemented by a power supply circuit, a human-machine interface, a signal generating circuit, and a power amplifier circuit. The large current output control source is powered by a high-power switching power supply module, and the small signal of the main control board is amplified to output a large current. The large current output module is synchronized and communicated with the voltage source module and the wireless volt-ampere phase meter slave module through a wireless module and GPS, and the closed-loop PID control is performed. , the output current amplitude tracks the given current amplitude without any difference, the inverter output voltage instantaneous value negative feedback and current amplitude negative feedback form a double closed-loop system; FPGA is responsible for controlling the signal generating circuit to output, and real-time monitoring the protection signal fed back by the control loop, DSP is responsible for collecting small signals for floating-point calculation to obtain the feedback current value, and controlling the power amplifier circuit to adjust the output, and communicate with the human-machine interface; the closed-loop PID control includes an inverter based on a half-bridge bidirectional current source high-frequency link, the inner current loop of the half-bridge bidirectional current source high-frequency link inverter is nonlinear, and the second-order oscillation link of the LC filter composed of the output filter inductor and capacitor is reduced to a first-order link.

[0009] As a preferred solution of the method for comprehensive testing, analyzing and verifying the vector status of the primary and secondary circuits of the substation described in the present invention, the voltage source module includes generating a stable high voltage with adjustable phase angle and amplitude by taking the AC220V power supply in the station, with DSP+FPGA as the control core, and the periphery is supplemented by a power supply circuit, a human-machine interface, a signal generating circuit, and a power amplifier circuit. The high-voltage output control source adopts transformer rectification and filtering to supply power, amplifies the small signal of the main control board, outputs high voltage through a step-up transformer, and performs synchronization and communication through a wireless module and a GPS module.

[0010] As a preferred solution of the method for comprehensive testing, analyzing and verifying the vector status of the primary and secondary circuits of the substation described in the present invention, the wireless reference source module includes a wireless phase reference source based on the single-phase operating voltage of the substation, the wireless transmission covers the entire station, and the remaining modules are controlled by the wireless input reference voltage phase to achieve adjustable output current amplitude and phase. The wireless phase reference source detects the positive zero crossing point of the reference voltage through a hardware circuit, and transmits a synchronization pulse as a phase reference every time a positive zero crossing point is detected.

[0011] As a preferred solution of the method for comprehensive testing, analyzing and verifying the vector status of the primary and secondary circuits of a substation described in the present invention, the wireless volt-ampere phase meter slave module includes modules distributed at different positions on the secondary side of the substation, performing multi-point distributed measurement, and measuring different groups of voltage and current data at the same time, completing the secondary side voltage and current data collection, and uploading it to the data concentrator through wireless communication.

[0012] As a preferred solution of the method for comprehensive testing, analyzing and verifying the vector status of the primary and secondary circuits of a substation described in the present invention, the data concentrator includes communicating with different voltage source modules, current source modules and wireless volt-ampere phase meter slave modules, receiving PC instructions and sending them to different sub-modules, and summarizing the data sampled by multiple slaves, transmitting them to the PC via a USB data cable, completing the functions of remote control and data concentrator uploading, and at the same time sending synchronization signals and control commands to the slaves for synchronous sampling and control.

[0013] Another object of the present invention is to provide a comprehensive test, analysis and verification system for the vector status of primary and secondary circuits of a substation, which can apply the current signal of the current source module to the primary side of the CT, and the voltage signal of the voltage source module to the primary side of the PT. The wireless volt-ampere phase meter slave module deployed on the secondary sides of the CT and PT synchronously measures the amplitude and phase of the voltage and current, and uploads them to the data concentrator through wireless communication, thereby solving the problem of high risk in the current primary and secondary circuit verification technology of substations.

[0014] As a preferred solution of the substation primary and secondary circuit vector state comprehensive test analysis and verification system described in the present invention, it includes: a signal synchronization module, a synchronous measurement module, and an analysis and verification module; the signal synchronization module is used for the PC to issue control instructions to the current source module and the voltage source module through the wireless communication data concentrator, and provide a synchronization signal through the wireless reference source module; the synchronous measurement module is used for the current signal of the current source module to be applied to the primary side of the CT, and the voltage signal of the voltage source module to be applied to the primary side of the PT, and the wireless volt-ampere phase meter slave module deployed on the secondary side of the CT and PT synchronously measures the amplitude and phase of the voltage and current, and uploads them to the data concentrator through wireless communication; the analysis and verification module is used for the PC to receive the current and voltage data measured on the secondary side, and compare and analyze with the current and voltage values ​​set by the control instruction, so as to verify the correctness of the secondary circuit wiring of the substation relay protection and automatic device.

[0015] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of a method for comprehensive testing, analyzing and verifying the vector states of primary and secondary circuits of a substation.

[0016] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for comprehensive testing, analyzing and verifying the vector states of primary and secondary circuits of a substation.

[0017] Beneficial effects of the present invention: The method for comprehensive testing, analyzing and verifying the vector status of the primary and secondary circuits of a substation provided by the present invention realizes synchronous and high-precision operation of multiple modules through centralized control and real-time signal monitoring of FPGA, which not only improves the convenience of operation and reduces the error of manual adjustment, but also ensures the consistency of the signals of each module and reduces the verification errors caused by phase or frequency deviation. Through current hysteresis control and dual closed-loop control systems, the output accuracy of the inverter is improved. This design enables the system to work efficiently under low voltage input and adapt to complex load conditions, and reduces the second-order oscillation link of the LC filter to a first-order link, further improving the stability of the system. , avoiding signal output distortion. At the same time, distributed measurement and wireless communication reduce the frequency of manual access and reduce the risk of short circuit or electric shock. Through the comparison and analysis of the collected data by PC, the wiring accuracy verification of relay protection and automatic devices is realized to ensure that the phase and polarity of the wiring are correct. The real-time signal acquisition and closed-loop control of DSP ensure the measurement accuracy and avoid the risk of false triggering caused by wiring errors. In addition, the use of SPWM algorithm enables the system to cope with various fault conditions, improves the adaptability and quality of the test, and provides stronger guarantee for the safe commissioning of the substation. The present invention has achieved better results in terms of reliability, safety and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 This is an overall flow chart of a method for comprehensive testing, analyzing and verifying the vector status of primary and secondary circuits in a substation provided in the first embodiment of the present invention.

[0020] Figure 2 A signal synchronization structure diagram of a method for comprehensive testing, analyzing and verifying the vector status of primary and secondary circuits in a substation provided in a second embodiment of the present invention.

[0021] Figure 3 A schematic diagram of the signal path and connection of a method for comprehensive testing, analyzing and verifying the vector status of primary and secondary circuits in a substation provided in a second embodiment of the present invention.

[0022] Figure 4 This is an overall flow chart of a system for comprehensive testing, analyzing and verifying the vector status of primary and secondary circuits in a substation provided in the third embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0024] Example 1, reference Figure 1 , which is an embodiment of the present invention, provides a method for comprehensive testing, analyzing and verifying the state of primary and secondary circuit vectors of a substation, comprising: S1: The PC issues control instructions to the current source module and the voltage source module through the wireless communication data concentrator, and provides synchronization signals through the wireless reference source module.

[0025] Furthermore, the PC includes a PC and a data concentrator connected via a USB data cable, controlling different current source modules and voltage source modules to output primary voltage and current, and simultaneously receiving multi-point slave secondary side voltage and current data transmitted by the data concentrator for display and analysis; the multi-point slaves and the wireless communication data concentrator communicate with each other through the Internet of Things card 4G module, and are synchronized through the GPS module and the wireless reference source broadcast synchronization signal, and the PC is connected to the data concentrator via a USB data cable to issue control instructions.

[0026] It should be noted that the current source module includes a three-phase AC380V power supply taken from the station to generate a large current with adjustable phase angle and amplitude. It uses DSP+FPGA as the control core, and is supplemented by a power supply circuit, a human-machine interface, a signal generating circuit, and a power amplifier circuit. The large current output control source is powered by a high-power switching power supply module, and the small signal of the main control board is amplified to output a large current. The large current output module is synchronized and communicated with the voltage source module and the wireless volt-ampere phase meter slave module through a wireless module and GPS. Through closed-loop PID control, the output current amplitude is tracked with the given current amplitude without difference, and the inverter outputs the instantaneous value of the voltage and the current amplitude with negative feedback, forming a double closed-loop system; FPGA is responsible for controlling the signal generating circuit to output, and real-time monitoring the protection signal fed back by the control loop; DSP is responsible for collecting small signals for floating-point operations to obtain the feedback current value, and controlling the power amplifier circuit The output is adjusted and communicated with the human-machine interface; the closed-loop PID control includes an inverter based on a half-bridge bidirectional current source high-frequency link. The inner loop of the half-bridge bidirectional current source high-frequency link inverter has nonlinearity, and the second-order oscillation link of the LC filter composed of the output filter inductor and capacitor is reduced to a first-order link; the double closed-loop system includes a waveform of a large current generator, which is synthesized by DSP using the waveform parameters input by the user through mathematical operations, and harmonic superposition and fault playback are performed. The waveform is sent from the corresponding GPIO to the inverter unit after high-frequency conversion by the SPWM algorithm. The actual output current is collected by a high-precision standard mutual inductor and sent to the DSP through the conditioning circuit and the AD acquisition circuit. The current amplitude and the phase difference with the remote phase reference source are obtained through calculation. The DSP compares the collected current amplitude with the set current information, and performs zero-difference tracking of the output current amplitude and the given current amplitude through closed-loop PID control.

[0027] It should also be noted that SPWM (Sinusoidal Pulse Width The SPWM algorithm is used in the present invention to control the output waveform of the inverter, so that the waveform of the output current and voltage is closer to the ideal sine wave. The function of SPWM is to convert the sine signal into a high-frequency pulse width modulation signal, thereby improving the accuracy and stability of the system output waveform, especially playing a key role in the large current output control process of the current source module. The SPWM algorithm generates a series of pulse signals by comparing the input sine reference signal with the high-frequency triangular carrier signal. The width of these pulse signals changes with the amplitude of the sine reference signal, so that the duty cycle of the pulse conforms to the shape of the sine function, thereby approximately generating a sine output waveform; the use of SPWM in specific steps includes: FPGA is responsible for generating control signals and outputting SPWM modulation signals, FPGA collects various feedback signals (such as protection signals, status signals, etc.) in the control loop in real time to ensure that the entire system is in a stable synchronous state, at this time, the SPWM algorithm is initialized on the FPGA to determine the frequency and carrier frequency of the modulation signal, and the FPGA generates the pulse width of the SPWM signal through high-speed logic control and transmits it to the DSP for further processing to achieve accurate control of current and voltage; DSP uses the SPWM algorithm to achieve large current generation The DSP synthesizes an ideal sinusoidal waveform through floating-point operations according to the waveform parameters set by the user (such as frequency, phase, and amplitude), and uses this waveform as the reference signal of SPWM. The DSP compares the reference sinusoidal signal with the high-frequency carrier signal to generate an SPWM pulse sequence, which is output to the power amplifier circuit of the inverter unit through the GPIO port. In the power amplifier circuit, the SPWM control pulse adjusts the switching state of the half-bridge inverter to generate a large current output. At the same time, the DSP collects the actual output current signal through a high-precision mutual inductor, and obtains the real-time amplitude and Phase difference, DSP compares the actual output current with the set value in a closed-loop PID. If there is a deviation, it is corrected by adjusting the pulse width of SPWM to ensure that the output current tracks the set current value without error. DSP uses closed-loop control to adjust the pulse width of the SPWM signal in real time to cope with sudden changes in load or input voltage. When the load or input voltage changes, SPWM can stabilize the output voltage by adjusting the output pulse width in real time to avoid distortion of the voltage and current waveforms. This high-frequency modulation technology combined with current hysteresis control effectively reduces the nonlinear error of the current inner loop, reduces the LC filter oscillation link to the first order, and improves system stability.

[0028] It should also be noted that the voltage source module includes a stable high voltage with adjustable phase angle and amplitude generated by taking the AC220V power supply from the station. It uses DSP+FPGA as the control core, and is supplemented by a power supply circuit, a human-machine interface, a signal generating circuit, and a power amplifier circuit. The high-voltage output control source is powered by transformer rectification and filtering, amplifies the small signal of the main control board, outputs high voltage through a step-up transformer, and synchronizes and communicates through a wireless module and a GPS module.

[0029] It should also be noted that the wireless reference source module includes a wireless phase reference source based on the single-phase operating voltage of the substation, and the wireless transmission covers the entire station. The remaining modules are controlled by the wireless input reference voltage phase to achieve adjustable output current amplitude and phase. The wireless phase reference source detects the positive zero crossing point of the reference voltage through a hardware circuit, and transmits a synchronization pulse as a phase reference each time a positive zero crossing point is detected.

[0030] It should also be noted that the control commands are transmitted to the current source module and the voltage source module through the centralized control of the PC and the distribution instructions of the wireless communication data concentrator, and the phase and frequency consistency of all modules are ensured with the help of the synchronization signal sent by the wireless reference source module. This configuration uses FPGA to be responsible for the generation and real-time monitoring of the control signal, ensuring that each module can respond immediately after the control command is issued, and automatically perform signal calibration and feedback protection. Under the monitoring of FPGA, each module can work according to the set frequency and phase, and monitor the feedback protection signal of the loop in real time, avoiding false triggering or protection failure caused by unstable voltage and current.

[0031] S2: The current signal of the current source module is applied to the primary side of the CT, and the voltage signal of the voltage source module is applied to the primary side of the PT. The wireless volt-ampere phase meter slave module deployed on the secondary sides of the CT and PT synchronously measures the amplitude and phase of the voltage and current, and uploads them to the data concentrator through wireless communication.

[0032] Furthermore, the slave modules of the wireless volt-ampere phase meter are distributed at different locations on the secondary side of the substation to perform multi-point distributed measurement, simultaneously measure different groups of voltage and current data, complete secondary side voltage and current data collection, and upload them to the data concentrator through wireless communication.

[0033] It should be noted that the data concentrator includes communications with different voltage source modules, current source modules and wireless volt-ampere phase meter slave modules, receives PC instructions and sends them to different sub-modules, and summarizes the data sampled by multiple slaves, and transmits it to the PC through a USB data cable to complete the functions of remote control and data concentrator upload, and at the same time sends synchronization signals and control commands to the slaves for synchronous sampling and control.

[0034] It should also be noted that the current source module and the voltage source module apply signals to the primary side of the CT and PT respectively, and the amplitude and phase of the voltage and current are obtained through multi-point distributed measurement of the wireless volt-ampere phase meter slave module on the secondary side. These modules use the collaborative control of DSP and FPGA. The DSP is responsible for collecting small signals of current and voltage and performing floating-point operations to obtain accurate feedback current values. At the same time, it adjusts the power amplifier circuit to achieve high-precision control and stable output. It is particularly noteworthy that the system uses a half-bridge bidirectional current source high-frequency link inverter, which has the characteristics of strong load adaptability, few power switches, and simple topology. The stability of the output signal is ensured through current hysteresis control, and it has high efficiency under low voltage input.

[0035] S3: The PC receives the current and voltage data measured on the secondary side, and compares and analyzes them with the current and voltage values ​​set by the control instructions to verify the correctness of the secondary circuit wiring of the substation relay protection and automatic devices.

[0036] Furthermore, the reference voltage range of the wireless reference source is 30V to 300V, and the input voltage range is relatively large, which places high requirements on the accuracy and sensitivity of the zero-crossing detection circuit. Therefore, the delay of the synchronization pulse at different input voltages should be considered as much as possible during circuit design, and compensation should be performed through hardware circuits and software to reduce synchronization errors. The input front end uses a 2mA / 2mA current transformer to convert the input voltage into current, and the output current is converted into voltage through a resistor. After being amplified by an operational amplifier, it enters the comparator. The comparator output is inverted by a PNP transistor and synchronized with the input voltage. The software uses a high-precision timer to detect whether the synchronization pulse is an industrial frequency signal (50Hz) and filters unqualified pulse signals.

[0037] It should be noted that the PC receives real-time measurement data from the secondary side through the wireless communication data concentrator, and compares it with the current and voltage values ​​set in the primary side, automatically analyzing whether the wiring of each circuit is correct. In this process, the DSP uses the signal collected by the high-precision standard mutual inductor to calculate the feedback current amplitude and the difference with the phase of the reference source in real time through the conditioning circuit and the AD acquisition circuit. Through closed-loop PID control, it ensures the error-free tracking of the output current and the set current. At the same time, the DSP can also use the SPWM algorithm to process the input signal at a high frequency to realize transient functions such as harmonic superposition and fault playback, providing accurate simulation and precise testing for verification in complex power environments.

[0038] Example 2, reference Figure 2-Figure 3 , which is an embodiment of the present invention, provides a method for comprehensive testing, analyzing and verifying the vector status of primary and secondary circuits in a substation. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0039] First, the PC is connected to the wireless communication data concentrator via a USB data cable, and communication with the remote module is established through the 4G module of the Internet of Things card; the experiment uses a current source module to provide a modulation signal for a three-phase AC380V power supply, and uses DSP and FPGA as the core, combined with closed-loop PID control and SPWM algorithm to accurately modulate the output current signal; FPGA is responsible for generating modulation signals and real-time monitoring of protection signals; DSP adjusts the power amplifier circuit through high-precision calculations to ensure that the waveform and amplitude of the output current meet the set parameters; the wireless reference source module provides a synchronization signal for the system to ensure that all modules operate at the same reference phase and frequency; the reference source module generates a synchronization pulse by detecting the positive zero crossing of the reference voltage in the range of 30V to 300V in the station and broadcasts it to the voltage source module, current source module and volt-ampere phase meter slave; the synchronization pulse keeps the operation of all modules in the system coordinated, avoiding data errors caused by asynchrony; Figure 2 The structural relationship between the PC, wireless communication data concentrator, wireless reference source, voltage source module, current source module and volt-ampere phase meter slave in the system is described, and the connection method between GPS synchronization and IoT card communication is indicated. Figure 3 It shows the signal path flow of the PC, wireless communication data concentrator, and wireless reference source in the system, the signal application points of the voltage source and current source modules, and the measurement point location of the volt-ampere phase meter slave module, and specifically explains the direction and connection of signal transmission.

[0040] During the experiment, the signal output of the current source module was applied to the primary side of the CT, and the signal of the voltage source module was applied to the primary side of the PT; the wireless volt-ampere phase meter slave modules distributed on the secondary sides of the CT and PT began to synchronously collect the amplitude and phase of the voltage and current, and uploaded them to the data concentrator through wireless communication; the data concentrator collected all the slave data and transmitted them to the PC for display and analysis; the PC compared the collected current and voltage data with the set control instruction value in real time; the DSP used the SPWM algorithm to perform high-frequency modulation on the reference sinusoidal signal to generate an ideal waveform, and corrected the output current deviation in real time through closed-loop PID control; finally, the system generated a verification report to record the voltage and current deviation information, and verified the wiring correctness and stability of the primary and secondary circuits of the substation; compared with the prior art, the present invention effectively overcomes the problems of large synchronization error, high delay and high distortion rate in traditional systems.

[0041] Example 3, reference Figure 4 , which is an embodiment of the present invention, provides a substation primary and secondary circuit vector state comprehensive test analysis and verification system, including a signal synchronization module, a synchronous measurement module, and an analysis and verification module.

[0042] The signal synchronization module is used by the PC to issue control instructions to the current source module and the voltage source module through the wireless communication data concentrator, and the synchronization signal is provided by the wireless reference source module; the synchronous measurement module is used to apply the current signal of the current source module to the primary side of the CT, and the voltage signal of the voltage source module to the primary side of the PT. The wireless volt-ampere phase meter slave module deployed on the secondary side of the CT and PT synchronously measures the amplitude and phase of the voltage and current, and uploads them to the data concentrator through wireless communication; the analysis and verification module is used by the PC to receive the current and voltage data measured on the secondary side, and compare and analyze them with the current and voltage values ​​set by the control instruction, so as to verify the correctness of the secondary circuit wiring of the substation relay protection and automatic device.

[0043] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk, etc. Various media that can store program codes.

[0044] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0045] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk case (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0046] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logical function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for comprehensive testing, analyzing and verifying the vector status of primary and secondary circuits in a substation, characterized in that: include: The PC issues control instructions to the current source module and the voltage source module through the wireless communication data concentrator, and provides synchronization signals through the wireless reference source module; The current signal of the current source module is applied to the primary side of the CT, and the voltage signal of the voltage source module is applied to the primary side of the PT. The wireless volt-ampere phase meter slave module deployed on the secondary sides of the CT and PT synchronously measures the amplitude and phase of the voltage and current, and uploads them to the data concentrator through wireless communication; The PC receives the current and voltage data measured on the secondary side, and compares and analyzes them with the current and voltage values ​​set by the control instructions to verify the correctness of the secondary circuit wiring of the substation relay protection and automatic devices.

2. The method for comprehensive testing, analyzing and verifying the primary and secondary circuit vector states of a substation according to claim 1, characterized in that: The PC includes a PC connected to a data concentrator via a USB data cable, controlling different current source modules and voltage source modules to output primary voltage and current, and simultaneously receiving secondary side voltage and current data of multiple slaves transmitted by the data concentrator for display and analysis; The multi-point slaves and the wireless communication data concentrator communicate with each other through the Internet of Things card 4G module, and are synchronized through the GPS module and the wireless reference source broadcast synchronization signal. The PC is connected to the data concentrator through a USB data cable to issue control instructions.

3. The method for comprehensive testing, analyzing and verifying the primary and secondary circuit vector states of a substation according to claim 2, characterized in that: The current source module includes a three-phase AC380V power supply taken from the station to generate a large current with adjustable phase angle and adjustable amplitude. The DSP+FPGA is used as the control core, and the periphery is supplemented by a power supply circuit, a human-machine interface, a signal generation circuit, and a power amplifier circuit. The large current output control source is powered by a high-power switching power supply module, and the small signal of the main control board is amplified to output a large current. The large current output module is synchronized and communicated with the voltage source module and the wireless volt-ampere phase meter slave module through a wireless module and GPS. Through closed-loop PID control, the output current amplitude is tracked without difference with the given current amplitude, and the inverter output voltage instantaneous value negative feedback and current amplitude negative feedback are negatively fed back to form a double closed-loop system; FPGA is responsible for controlling the signal generation circuit to output and monitoring the protection signal fed back by the control loop in real time. DSP is responsible for collecting small signals to perform floating-point operations to obtain the feedback current value, controlling the power amplifier circuit to adjust the output, and communicating with the human-machine interface. The closed-loop PID control includes an inverter based on a half-bridge bidirectional current source high-frequency link. The inner current loop of the half-bridge bidirectional current source high-frequency link inverter has nonlinearity, which reduces the second-order oscillation link of the LC filter composed of the output filter inductor and capacitor to a first-order link. The dual closed-loop system includes a waveform of a large current generator synthesized by DSP using waveform parameters input by the user through mathematical operations, and harmonic superposition and fault playback are performed. The waveform is high-frequencyized by the SPWM algorithm and sent from the corresponding GPIO to the inverter unit. The actual output current is collected by a high-precision standard mutual inductor and sent to the DSP through a conditioning circuit and an AD acquisition circuit. The current amplitude and the phase difference with the remote phase reference source are obtained through calculation. The DSP compares the collected current amplitude with the set current information, and performs error-free tracking of the output current amplitude and the given current amplitude through closed-loop PID control.

4. The method for comprehensive testing, analyzing and verifying the primary and secondary circuit vector states of a substation as claimed in claim 3 is characterized by: The voltage source module includes a stable high voltage with adjustable phase angle and amplitude generated by taking the AC220V power supply in the station, with DSP+FPGA as the control core, and the periphery is supplemented by a power supply circuit, a human-machine interface, a signal generating circuit, and a power amplifier circuit. The high-voltage output control source adopts transformer rectification and filtering to power the small signal of the main control board, amplifies the high voltage through the step-up transformer, and synchronizes and communicates through the wireless module and the GPS module.

5. The method for comprehensive testing, analyzing and verifying the primary and secondary circuit vector states of a substation according to claim 4, characterized in that: The wireless reference source module includes a wireless phase reference source that takes one-phase operating voltage of the substation as a reference, and wireless transmission covers the entire station. The remaining modules are controlled by the wireless input reference voltage phase to achieve adjustable output current amplitude and phase. The wireless phase reference source detects the positive zero crossing point of the reference voltage through a hardware circuit, and transmits a synchronization pulse as a phase reference every time a positive zero crossing point is detected.

6. The method for comprehensive testing, analyzing and verifying the primary and secondary circuit vector states of a substation according to claim 5, characterized in that: The wireless volt-ampere phase meter slave module is distributed at different locations on the secondary side of the substation to perform multi-point distributed measurement, simultaneously measure different groups of voltage and current data, complete secondary side voltage and current data collection, and upload to the data concentrator through wireless communication.

7. The method for comprehensive testing, analyzing and verifying the primary and secondary circuit vector states of a substation according to claim 6, characterized in that: The data concentrator includes a module that communicates with different voltage source modules, current source modules and wireless volt-ampere phase meter slave modules, receives PC instructions and sends them to different sub-modules, and summarizes the data sampled by multiple slaves and transmits them to the PC via a USB data cable to complete the functions of remote control and data concentrator uploading. At the same time, the synchronization signal and control command are sent to the slave for synchronous sampling and control.

8. A system using the method for comprehensive testing, analyzing and verifying the primary and secondary circuit states of a substation as claimed in any one of claims 1 to 7, characterized in that: It includes signal synchronization module, synchronous measurement module and analysis and verification module; The signal synchronization module is used for the PC to issue control instructions to the current source module and the voltage source module through the wireless communication data concentrator, and to provide synchronization signals through the wireless reference source module; The synchronous measurement module is used for applying the current signal of the current source module to the primary side of the CT, and the voltage signal of the voltage source module to the primary side of the PT. The wireless volt-ampere phase meter slave module deployed on the secondary side of the CT and PT synchronously measures the amplitude and phase of the voltage and current, and uploads them to the data concentrator through wireless communication; The analysis and verification module is used for the PC to receive the current and voltage data measured on the secondary side, and compare and analyze them with the current and voltage values ​​set by the control instruction to verify the correctness of the secondary circuit wiring of the substation relay protection and automatic device.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for comprehensive testing, analyzing and verifying the primary and secondary circuit vector states of a substation described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for comprehensive testing, analyzing and verifying the primary and secondary circuit vector states of a substation described in any one of claims 1 to 7 are implemented.

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