WO2006081736A1 - Systeme de surveillance pour moteur a mazout et reseau electrique longue distance et methode d'analyse et de surveillance de leurs ondes harmoniques - Google Patents

Systeme de surveillance pour moteur a mazout et reseau electrique longue distance et methode d'analyse et de surveillance de leurs ondes harmoniques Download PDF

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Publication number
WO2006081736A1
WO2006081736A1 PCT/CN2006/000069 CN2006000069W WO2006081736A1 WO 2006081736 A1 WO2006081736 A1 WO 2006081736A1 CN 2006000069 W CN2006000069 W CN 2006000069W WO 2006081736 A1 WO2006081736 A1 WO 2006081736A1
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WO
WIPO (PCT)
Prior art keywords
monitoring
oil machine
harmonic
signal
frequency
Prior art date
Application number
PCT/CN2006/000069
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English (en)
Chinese (zh)
Inventor
Chenggang Duan
Haiwen Zhang
Xiaohua Wu
Ming Feng
Haitao Cai
Original Assignee
Emerson Network Power Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Emerson Network Power Co., Ltd. filed Critical Emerson Network Power Co., Ltd.
Publication of WO2006081736A1 publication Critical patent/WO2006081736A1/fr

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
    • G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols

Definitions

  • the present invention relates to oil machine monitoring and grid monitoring equipment, and more particularly to an apparatus for remote fuel tank monitoring and grid monitoring. Background technique
  • oil machine self-starting devices For the monitoring of oil engines (fuel generators, usually diesel generators), there are various oil machine self-starting devices in the industry. These devices are usually installed on the oil machine, which can realize the self-starting control of the oil machine and the monitoring of the oil machine. Among these devices, there are usually local human-machine interfaces, and some also have remote communication interfaces.
  • the prior art oil machine monitoring device and the power grid monitoring device which are to be solved by the present invention operate independently, which brings great inconvenience to the monitoring work, especially the remote monitoring work.
  • the present invention provides an apparatus for realizing remote oil machine monitoring and power grid monitoring, including: a digital signal processor; an analog parameter input interface for inputting an oil machine simulation parameter and a grid simulation parameter, and An analog to digital converter coupled between the analog parameter input interface and the digital signal processor; a digital input processor coupled to the digital signal processor for inputting a switch quantity of the oil machine; and the digital signal processor And a control signal output interface for outputting a control signal; and a remote communication interface for connecting to the digital signal processor for implementing remote communication.
  • the analog parameter input interface includes three AC voltage measurement channels, three AC current measurement channels, and one oil machine start battery voltage measurement channel;
  • the utility model comprises a 12-way switch quantity collecting channel; wherein the control signal output interface comprises 4 way relay driving channels.
  • the invention also provides a method for realizing harmonic analysis monitoring by using the above monitoring device, which comprises the following steps -
  • v t is the amplitude of the fundamental wave
  • v 2 , v 3 , 1 ⁇ 4, ..., v n are the amplitudes of the respective harmonics.
  • the method of the present invention further includes the steps of: determining whether the calculated total harmonic distortion rate exceeds a predetermined total harmonic distortion rate permit value, or determining whether the calculated nth harmonic content exceeds a predetermined nth time
  • the harmonic content permit value if yes, the control device sends a control signal to disable the grid power supply, and starts the oil machine to generate electricity.
  • the alternating signal can be simultaneously sampled by using a weekly wave of 128 or 256 points.
  • the software synchronous sampling method can be used to adjust the AC sampling frequency according to the frequency of the AC signal, so that the sampling frequency and the signal frequency are synchronized, and the sampling frequency is 128 times or 256 times of the frequency of the AC signal. It is also possible to use a hardware phase-locked loop synchronous sampling method to perform frequency-multiplying tracking on the input AC signal, and directly trigger the AC sampling using the output multi-frequency synchronization signal.
  • the invention integrates the oil machine monitoring and the power grid monitoring function, and adopts a high-performance digital signal processor, and has an analog input parameter interface with good low-pass and linear characteristics, and enough High signal sampling speed, can complete telemetry, remote signaling, remote control, and remote test functions on the oil machine, and can be used as a basic reference to the power grid.
  • the number and other parameters are monitored, in particular, the harmonics of the power grid can be analyzed, and the harmonic analysis data can be used to reduce the negative interference of harmonic pollution on the user's sensitive electronic equipment.
  • FIG. 1 is a schematic diagram of an apparatus for implementing remote oil machine monitoring and power grid monitoring according to the present invention
  • FIG. 2 is a preferred embodiment of the present invention.
  • FIG. 3 is a schematic illustration of the application of the apparatus of the present invention for implementing remote oil machine monitoring and grid monitoring. detailed description
  • One of the objects of the invention is to achieve integrated remote monitoring of the grid and the oil machine through a single product. Its technical solution is to integrate the oil machine monitoring and grid monitoring functions.
  • the principle is shown in Figure 1. These include: a digital signal processor; an analog parameter input interface for inputting analog parameters of the oil machine and analog parameters of the power grid; an analog-to-digital converter (ADC) connected between the analog parameter input interface and the digital signal processor , used to convert analog parameters into digital signals; digital input interface, which is used to input multiple switches of the oil machine; control signal output interface, which is used to output control signals, such as relay drive signals, LED drive signals; Communication interface, which is used to implement remote communication.
  • ADC analog-to-digital converter
  • FIG. 2 A preferred embodiment of the present invention is illustrated in Figure 2, in which the DSP (Digital Signal Processor) and its peripheral circuitry form the DSP minimum system (shown in the dashed box in the figure).
  • DSP Digital Signal Processor
  • the 12-channel switch signal is directly input to the lower left I/O interface, and the other analog is input to the ADC (analog-to-digital converter), which converts it into a digital signal that the DSP can process.
  • ADC analog-to-digital converter
  • the DSP After the DSP processes these switching signals and the ADC-converted digital signals, on the one hand, four relay driving signals are output through the lower left I/O interface, and one of the relay driving signals can be used to realize the oil machine. Control (start or stop), other switch control functions can be realized by using the remaining three relay drive signals; the I/O interface also outputs two LED drive signals to display the working state of the device through the LEDs.
  • the DSP also provides the monitored parameters and processing results to the upper-level users through the upper communication interface; at the same time, the user can remotely call various functions of the device through the communication interface to realize monitoring of the power grid and the oil machine. .
  • the TMS320LF2407A in Figure 2 is the DSP chip model used, including all the functional blocks in the solid line frame.
  • WD is the watchdog clock module, which is used for system monitoring and automatically resets when a program error occurs. However, it is not used in this embodiment, but a more reliable external system monitoring circuit is used.
  • CAN Controller Area Network Interface
  • SCI Serial Communication Interface
  • SPI Serial Peripheral Interface
  • the Comm Interface is the entire communication interface part including CAN, SCI, and SPI.
  • DARAM is a dual-port RAM integrated in the DSP that acts as an internal storage resource for variables and data.
  • EVA is an integrated event management module in DSP, which is not used in the embodiment.
  • the EVB is also an event management module integrated in the DSP, which is not used in this embodiment.
  • SARAM is a single-port RAM integrated in the DSP that acts as an internal storage resource for variables and data.
  • FLASH is a flash memory used to store programs.
  • External memory interface is an external memory interface for connecting to external memory.
  • the SRAM is an external memory that is interfaced with the external memory.
  • External clock is an external clock source for inputting clock signals.
  • the JTAG port is a JTAG interface for interfaces for program emulation and download.
  • the serial EEPROM is used to store the configuration data of the system. JTAG connector for and emulator The JTAG interface is connected to download programs or emulations.
  • An external system supervisory circuit is used to monitor system voltage and system program operation, providing a
  • the RS232 control port and the RS485 communication port share a DSP serial communication interface, and the communication arbitration circuit provides high-priority arbitration for the RS232 interface. If RS232 is connected, RS485 is invalid.
  • the DSP can process and analyze the input of the above-mentioned one-way starting battery voltage measuring channel and 12-channel digital input channel, and can output four relay driving signals, thereby realizing the telemetry, remote signaling and remote control functions of the oil machine. Oil machine test function can also be realized, where -
  • Oil machine telemetry Refers to the analog parameters of the remote measuring oil machine, such as measuring the voltage of the oil starting battery;
  • Oil machine remote signal Refers to the remote measurement of the oil machine's switching amount (alarm quantity and status quantity), such as manual / automatic status, start / stop status, high water temperature alarm, low oil pressure alarm, low fuel level Alarm, oil machine failure alarm;
  • Oil machine remote control refers to the start/stop of the remote control oil machine
  • Oil machine remote test Refers to the remote start test run, combined with relevant parameters to determine whether the oil machine is normal.
  • the DSP can process and analyze the input of the above three AC voltage measurement channels and three AC current measurement channels, and the following monitoring functions can be realized -
  • Basic parameter monitoring including monitoring of current RMS, voltage RMS, active power, reactive power, apparent power, power factor, active energy, reactive energy, apparent power, grid frequency, etc.
  • Power quality analysis including monitoring of voltage deviation, frequency deviation, harmonic analysis, and three-phase voltage imbalance;
  • Fault recording Record the voltage and current fault waveform by continuously identifying the system disturbance
  • Event Logging Record system events and time stamps, and note the various grid parameters at the time.
  • one, multiple or all of the above monitoring functions can be selected.
  • harmonics in the power grid generally come from the pollution of the power grid by non-linear loads. These harmonic pollutions will cause interference to the user's sensitive electronic equipment, and will also cause the core of the transformer to heat up and shorten its service life.
  • harmonic analysis the percentage of harmonics in the power grid can be obtained. According to this, it can be judged whether the harmonic content in the power grid exceeds the standard. In China's national standard, the voltage total harmonic distortion rate of the 380V power grid does not exceed 5%. Based on this, it is determined whether the grid voltage is suitable for use, so that the user can protect the device and assist the user in locating the harmonic pollution problem. For example, in order to protect sensitive electronic equipment, the user can set, when the monitoring result shows that the voltage total harmonic distortion rate of the power grid exceeds 5 %, the grid power supply is deactivated, and the oil machine is started to generate electricity.
  • the AC sampling circuit should have good low-pass and linear characteristics to ensure that the higher harmonics can pass smoothly;
  • the signal sampling speed should be high enough to ensure that the high-order harmonics reach the Nyquist frequency required by the Shannon's theorem and reduce the spectral aliasing;
  • the CPU also needs high digital signal processing capability. This should use a suitable digital signal processor, such as the ⁇ 2000 series fixed-point DSP that can be used.
  • the AC sampling of the harmonic analysis can simultaneously sample the AC signal by using the weekly wave 128 or 256 points.
  • THD n (%) ⁇ ⁇ , ⁇ ⁇ / ⁇
  • Vn is the nth harmonic amplitude
  • Vt is the fundamental amplitude
  • the user can set the power grid power supply to be deactivated when the monitoring result shows that the voltage total harmonic distortion rate of the grid exceeds 5%, and start the oil generator to generate power to protect sensitive equipment.
  • FIG. 3 is a schematic diagram of an application of the device of the present invention. It shows the use of telecommunications
  • the households use the DC power supply system to supply power to the telecommunication equipment.
  • the input power of the DC power supply system comes from the mains.
  • the user In order to improve the reliability and use the oil machine to generate electricity to save costs during peak hours, the user generally It is equipped with a spare diesel generator.
  • the mains and the oil machine are switched by the ATS (Automatic Transfer Switchgear).
  • ATS Automatic Transfer Switchgear
  • the monitoring device processes the collected grid voltage and current signals, calculates various grid parameters, and analyzes the grid harmonics to calculate the percentage of grid harmonics. Then, through the remote communication port ( Figure RS485 in 3), these parameters are sent to the upper user.
  • the monitoring device obtains the operating state and alarm condition of the oil machine through the collected switch quantity, and can also execute the oil machine test command sent by the user according to the predetermined process, which is convenient for realizing the remote operation of the oil machine. Regular testing to achieve remote maintenance of the oil machine.
  • the 18-60V DC power supply in Figure 3 is the operating power supply to the monitoring unit.

Abstract

L'invention concerne un dispositif de surveillance pour moteur à mazout et réseau électrique longue distance comprenant un processeur de signal numérique, une interface d'entrée de paramètre analogique pour introduire le ou les paramètres analogiques du moteur à mazout et le ou les paramètres analogiques du réseau électrique, un convertisseur A/N raccordé entre l'interface d'entrée de paramètre analogique et le processeur de signal numérique, une interface d'entrée de valeur de commutation pour introduire le ou les signaux de valeur de commutation du moteur à mazout, une interface de sortie de signal de contrôle et une interface de communication longue distance. Les fonctions de surveillance du moteur à mazout et du réseau électrique sont intégrées ensemble et il est possible d'obtenir ainsi la mesure à distance, la détection à distance, le commande à distance et les fonctions de mesure longue distance du moteur à mazout, la surveillance de différents paramètres du réseau électrique et l'analyse des ondes harmoniques du réseau électrique.
PCT/CN2006/000069 2005-02-03 2006-01-17 Systeme de surveillance pour moteur a mazout et reseau electrique longue distance et methode d'analyse et de surveillance de leurs ondes harmoniques WO2006081736A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200510033186.1 2005-02-03
CNB2005100331861A CN100429858C (zh) 2005-02-03 2005-02-03 远程油机、电网监控装置及其谐波分析监控方法

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WO2016045112A1 (fr) * 2014-09-28 2016-03-31 万盛(中国)科技有限公司 Dispositif de commande de gaz permettant la simulation d'une source d'incendie et procédé de commande
CN112485523A (zh) * 2020-11-25 2021-03-12 云南电网有限责任公司电力科学研究院 一种判定谐波电压测量失真方法
CN112506114A (zh) * 2020-12-29 2021-03-16 河南辉煌科技股份有限公司 基于dsp芯片的铁路信号外电网监测装置
CN112924798A (zh) * 2021-02-08 2021-06-08 北京中电普华信息技术有限公司 一种电能质量监测方法、装置及电子设备
CN114527384A (zh) * 2022-03-07 2022-05-24 江苏斯菲尔电气股份有限公司 一种带有工业以太网的电动机保护及故障诊断控制器
CN117572158A (zh) * 2024-01-16 2024-02-20 武汉邢仪新未来电力科技股份有限公司 录波定位型故障指示方法、系统及指示器

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CN104316884B (zh) * 2014-11-04 2017-07-07 张海呈 一种基于fft频谱分析的油机发电监测终端
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WO2016045112A1 (fr) * 2014-09-28 2016-03-31 万盛(中国)科技有限公司 Dispositif de commande de gaz permettant la simulation d'une source d'incendie et procédé de commande
CN112485523A (zh) * 2020-11-25 2021-03-12 云南电网有限责任公司电力科学研究院 一种判定谐波电压测量失真方法
CN112485523B (zh) * 2020-11-25 2024-04-09 云南电网有限责任公司电力科学研究院 一种判定谐波电压测量失真方法
CN112506114A (zh) * 2020-12-29 2021-03-16 河南辉煌科技股份有限公司 基于dsp芯片的铁路信号外电网监测装置
CN112924798A (zh) * 2021-02-08 2021-06-08 北京中电普华信息技术有限公司 一种电能质量监测方法、装置及电子设备
CN112924798B (zh) * 2021-02-08 2022-11-08 北京中电普华信息技术有限公司 一种电能质量监测方法、装置及电子设备
CN114527384A (zh) * 2022-03-07 2022-05-24 江苏斯菲尔电气股份有限公司 一种带有工业以太网的电动机保护及故障诊断控制器
CN114527384B (zh) * 2022-03-07 2023-10-27 江苏斯菲尔电气股份有限公司 一种带有工业以太网的电动机保护及故障诊断控制器
CN117572158A (zh) * 2024-01-16 2024-02-20 武汉邢仪新未来电力科技股份有限公司 录波定位型故障指示方法、系统及指示器
CN117572158B (zh) * 2024-01-16 2024-03-29 武汉邢仪新未来电力科技股份有限公司 录波定位型故障指示方法、系统及指示器

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