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Design and Implementation of the device measurement unit synchronized phasor measurements

Author: XuHuaDong
Tutor: HuangZuo
School: University of Electronic Science and Technology
Course: Detection Technology and Automation
Keywords: Synchronized Phasor Measurement Measurement unit Fast Fourier Transform DFT recursive Network Communications
CLC: TM732
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 1
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Abstract


With the growing scale of the power system, the increasing demands of the real-time monitoring of the grid. Synchronized phasor measurement unit has become a core part of the modern power monitoring because of its advantage in synchronous measurement and real-time monitoring, and widely used in wide-area measurement system. Synchronized phasor measurement device will send the bus phasor monitoring points with a time stamp of the whole network, generator power angle information to the control center, to achieve real-time dynamic monitoring of the entire network. In this paper, the synchronized phasor measurement unit of measurement unit, and the hardware design and software implementation. The measurement unit is divided into the synchronous bus phasor measurement units and synchronous generators within absolute potential measurement unit, respectively measuring the bus phasor and generator power angle, speed. This paper first introduces the overall structure of the measuring unit, sub-chapters for hardware design and software implementation. Hardware design, including a sub-module of the analog signal acquisition module, the key phase pulse acquisition module, the measurement unit control module, network communications, hardware design, software implementation of the data processing and communications module. The analog signal acquisition module comprises the strong signal acquisition circuit, a voltage follower, filter and analog to digital converter circuit. The function of this module is to achieve a the grid strong signal acquisition, filter out interference, and converts the analog signal into a digital signal, the completion of the acquisition of the signal under test. Completion of the key phase pulse acquisition module generator key phase pulse without delay acquisition. The measurement unit control module is a control architecture of the CPLD DSP, CPLD sampling pulse, and sent according to the received GPS signal in the synchronous generator absolute inner potential acquisition key phase pulse, calculated the generator Keyphasor pulse angle and speed measurement unit, DSP is the main processor of the measurement unit, responsible for data processing and analysis. Network communication hardware design minimum based on Rabbit3000 microcontroller network communication system, the measurement data sent through the network to the upper processor. Data processing and communication module DSP phasor measurement algorithms phasor decomposition algorithm, power angle measurement the algorithm algorithm achieve and Rabbit3000 of in the realization of the network traffic. Choose phasor measurement method for the discrete Fourier transform method, the radix-4 fast Fourier transform, DFT recursive algorithm, DFT correction algorithm to obtain fundamental phase. Phasor decomposition after symmetrical components for positive sequence, negative sequence and zero-sequence component. Selection of improved power angle measurement method to avoid the traditional zero-crossing detection due to error, and improve the measurement accuracy. Based on the the Dynamic C measurement unit with the upper processor network communication design, so that data over longer distances, faster transmission. The article in the final design completed measuring unit has been tested, the test results show that the measuring unit can be realized bus phasor and the real-time measurement of the electrical potential within the generator, and the measuring accuracy is higher, to meet the design requirements of the functional indicators.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system scheduling, management, communication > The operation of the power system
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