CN102520236A - Multifunctional wind power quality monitor - Google Patents

Abstract

The invention relates to the field of wind power quality and provides a multifunctional wind power quality monitor. The monitor includes: voltage sensor and current sensor: convert the high voltage and high current to be measured in the wind power system into low voltage, low current analog signals; signal conditioner: filter and bias the analog signals; A/ D converter: convert the processed analog signal into a digital signal; DSP processor: DSP reads the digital signal converted by the A/D conversion module, uses the fast Fourier algorithm FFT to process the digital signal, and transfers the processed data through the SCI interface Pass it to the MCU module; MCU module: display the received data in real time according to the ARM application program; the A/D conversion module is also externally connected with a phase-locked frequency multiplier module and a zero-crossing comparison optocoupler isolation module. The invention can simultaneously monitor multiple power quality parameters and display the power quality parameters in real time.

Description

Multifunctional wind power quality monitor

technical field

The invention relates to the field of wind power quality, in particular to a multifunctional wind power quality monitor.

Background technique

As the main form of wind energy utilization, wind power generation has been highly valued by countries all over the world. With the continuous increase of installed wind power capacity in the world, the impact of wind power generation on the power grid and the impact of power harmonics cannot be ignored, and the voltage, frequency fluctuations and power harmonics caused by unstable wind speed will have a negative impact on equipment connected to the power grid. In severe cases, it will threaten the safe and stable operation of the power grid. Therefore, it is very necessary to develop a wind power quality monitoring and management system for long-term and continuous monitoring and management of power quality for a comprehensive grasp and improvement of power quality. At present, the current domestic wind power quality monitoring terminals can only monitor the voltage, current effective value and active power, but cannot monitor the voltage and current distortion rate and harmonic content, and cannot display the monitored parameters in the form of waveforms, which affects the wind power. Real-time analysis and evaluation of quality is not conducive to troubleshooting.

Contents of the invention

The purpose of the present invention is to overcome the single-function limitation of the existing wind power quality monitoring system and provide a multifunctional wind power quality monitor. The monitor can simultaneously monitor multiple power quality parameters and display them in appropriate forms and windows on the terminal interface.

The purpose of the present invention is achieved through the following technical solutions: a multifunctional wind power quality monitor, comprising a voltage sensor, a current sensor, a signal conditioner, an A/D converter, a DSP processor and an MCU module, and the voltage sensor and the current sensor are respectively The high voltage and high current to be measured in the wind power system are converted into low voltage and low current analog signals. After the signal conditioner filters and biases the analog signal, the A/D converter collects the analog signal and converts it to Convert it into a digital signal, and then read the digital signal into the memory by the DSP processor, then call the FFT algorithm for calculation and processing by the DSP processor, and finally pass the processed data to the MCU module for real-time display through the SCI interface.

The monitor also includes a zero-crossing comparison optocoupler isolation module and a phase-locked frequency multiplication module, and the power grid, the zero-crossing comparison optocoupler isolation module, the phase-locked frequency multiplier module and the A/D converter are connected in sequence.

The zero-crossing comparison optocoupler isolation module is provided with a zero-crossing comparator to ensure that the sampling signal is strictly synchronized with the signal to be tested; the phase-locked frequency multiplication module is provided with a phase-locked loop to ensure that the A/D conversion The sampling frequency of the device.

The DSP data processor is externally connected with an SRAM memory.

The DSP data processor is downloaded and debugged through the JTAG interface.

The MCU module is externally connected with a FRAM memory.

The MCU module is connected with the computer through the communication interface.

The MCU module is externally connected with an LCD display and a keyboard input module.

Described DSP processor adopts DSP TMS320F2812 processor.

The MCU module adopts ARM9 S3C2440 processor.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

The multi-functional wind power quality monitoring terminal can comprehensively monitor the operation of the wind power system, especially the harmonic content of each voltage and current, providing a strong guarantee for finding the cause of system failure and providing a guarantee for the safe and reliable operation of the entire wind power system. Reliable data protection. And it can save historical data for future query and provide effective prediction for the future operation status of wind power system based on historical data. At the same time, the device is easy to operate, safe and reliable, intuitive and easy to understand, which greatly facilitates and simplifies the measurement and control of wind farms.

Description of drawings

Fig. 1 is a functional block diagram of the present invention.

Fig. 2 is a histogram of phase A voltage harmonics output by the monitor of the present invention.

Fig. 3 is a three-phase voltage waveform diagram output by the monitor of the present invention.

Fig. 4 is a three-phase current waveform diagram output by the monitor of the present invention.

Detailed ways

The implementation of the present invention will be further described below in conjunction with the drawings and embodiments, but the implementation of the present invention is not limited thereto.

As shown in Figure 1, a multifunctional wind power quality monitor includes a voltage sensor, a current sensor, a signal conditioner, an A/D converter, a DSP processor, and an MCU module. The measured high voltage and high current are converted into low voltage and small current analog signals, and after the signal conditioner filters and biases the analog signal, the A/D converter collects the analog signal and converts it into a digital signal. Then the DSP processor reads the digital signal into the memory, and then the DSP processor calls the FFT algorithm for calculation and processing, and finally transmits the processed data to the MCU module through the SCI interface for real-time display.

The monitor also includes a zero-crossing comparison optocoupler isolation module and a phase-locked frequency multiplication module, and the power grid, the zero-crossing comparison optocoupler isolation module, the phase-locked frequency multiplier module and the A/D converter are connected in sequence.

The zero-crossing comparison optocoupler isolation module is provided with a zero-crossing comparator to ensure that the sampling signal is strictly synchronized with the signal to be tested; the phase-locked frequency multiplication module is provided with a phase-locked loop to ensure that the A/D conversion The sampling frequency of the device.

The DSP data processor is externally connected with an SRAM memory.

The DSP data processor is downloaded and debugged through the JTAG interface.

The MCU module is externally connected with a FRAM memory.

The MCU module is connected with the computer through the communication interface.

The MCU module is externally connected with an LCD display and a keyboard input module.

Described DSP processor adopts DSP TMS320F2812 processor.

The MCU module adopts ARM9 S3C2440 processor.

The multi-functional wind power monitor adopts the dual CPU mode of DSP+ARM, making full use of the advantages of DSP in data processing and the super interface display capability of ARM. As a slave, DSP is mainly used for data acquisition and processing, such as harmonic content analysis, calculation of voltage and current distortion rate, and calculation of various basic electrical parameters. As the host, ARM completes the control and display of the entire device, such as parameter setting, real-time display of power quality parameters, etc.

In terms of hardware: what DSP selects is a high-performance 32-bit fixed-point DSP TMS320F2812, which is a fixed-point digital signal processor based on the TMS320Cxx core, and what ARM selects is Samsung's ARM9 chip S3C2440; in terms of software: DSP adopts the classic fast Fourier Leaf algorithm (FFT), which can accurately and quickly analyze the harmonic content of voltage and current. ARM adopts WINCE embedded operating system, and ARM application programs are written in C# language using Visual Studio 2008 development tools.

Use wire to connect the grid in the wind power system with the corresponding wiring port of the monitoring instrument of the present invention, turn on the power supply, and the monitoring instrument can start to work, as shown in Figure 2 is the A-phase voltage harmonic histogram of the monitoring instrument output of the present invention; Fig. 3 and FIG. 4 are respectively the three-phase voltage waveform diagram and the three-phase current waveform diagram output by the monitor of the present invention.

Claims (10)

1. multi-functional wind-powered electricity generation quality monitor; It is characterized in that said monitor comprises voltage sensor, current sensor, signal conditioner, A/D converter, dsp processor and MCU module; Voltage sensor and current sensor are the simulating signal of low-voltage, little electric current with high voltage to be measured in the wind power system with big current conversion respectively; After via signal conditioner this simulating signal being carried out filtering and bias treatment; This simulating signal of A/D converter collection converts thereof into digital signal; By dsp processor this digital signal is read in the internal memory, dsp processor calls fft algorithm and carries out computing then again, and the data transfer after will handling through the SCI interface at last shows for the MCU module in real time.

2. a kind of multi-functional wind-powered electricity generation quality monitor according to claim 1; It is characterized in that said monitor also comprised zero balancing light-coupled isolation module and phase locking frequency multiplying module, electrical network, mistake zero balancing light-coupled isolation module, phase locking frequency multiplying module are connected with A/D converter successively.

3. a kind of multi-functional wind-powered electricity generation quality monitor according to claim 2 is characterized in that the said zero balancing light-coupled isolation module of crossing is provided with zero-crossing comparator, in order to guarantee sampled signal and measured signal strict synchronism; Said phase locking frequency multiplying module is provided with phaselocked loop, in order to guarantee the SF of A/D converter.

4. a kind of multi-functional wind-powered electricity generation quality monitor according to claim 1 is characterized in that said DSP data processor is externally connected with the SRAM storer.

5. a kind of multi-functional wind-powered electricity generation quality monitor according to claim 4 is characterized in that said DSP data processor downloads and debug through jtag interface.

6. a kind of multi-functional wind-powered electricity generation quality monitor according to claim 1 is characterized in that said MCU module is externally connected with the FRAM storer.

7. a kind of multi-functional wind-powered electricity generation quality monitor according to claim 6 is characterized in that said MCU module is connected with computing machine through communication interface.

8. a kind of multi-functional wind-powered electricity generation quality monitor according to claim 7 is characterized in that said MCU module is externally connected with LCD display and keyboard load module.

9. a kind of multi-functional wind-powered electricity generation quality monitor according to claim 1 is characterized in that said dsp processor adopts DSP TMS320F2812 processor.

10. a kind of multi-functional wind-powered electricity generation quality monitor according to claim 1 is characterized in that said MCU module adopts ARM9 S3C2440 processor.

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