CN103513105A - 220V synchronous phasor measurement device on user side - Google Patents

220V synchronous phasor measurement device on user side Download PDF

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CN103513105A
CN103513105A CN201310397678.3A CN201310397678A CN103513105A CN 103513105 A CN103513105 A CN 103513105A CN 201310397678 A CN201310397678 A CN 201310397678A CN 103513105 A CN103513105 A CN 103513105A
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unit
phasor
main cpu
information
user
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赵庆生
陈群伟
何志方
郭贺宏
韩肖清
熊洁
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Taiyuan University of Technology
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Abstract

The invention provides a 220V synchronous phasor measurement device on a user side. The device comprises a driving CPU and a driven CPU which are in seamless connection through a serial peripheral interface; the driving CPU is connected with a 220V alternating-current power grid through a signal acquiring and processing unit and obtains phasor information in the alternating-current power grid through FFT, and the driving CPU is further connected with a data storage unit and a display unit and controls the working state of the data storage unit and the working state of the display unit through a keyboard; the driven CPU receives the phasor information of the driving CPU and is connected with a synchronous clock unit so as to obtain accurate time information, and the driven CPU is connected with a communication unit so that the time-scale-carrying phasor information can be transmitted to a server terminal. The measurement device is low in cost, simple in structure, convenient to install and prone to achieve wide area measuring of the power grid compared with a traditional phasor measurement unit.

Description

A kind of 220V user's side synchronous phasor measuring device
Technical field
The present invention relates to electrical power system wide-area phasor measuring technique field, relate to more precisely a kind of high performance 220V user's side synchronous phasor measuring device.
Background technology
In recent years, the widespread use in electric system along with automatic technology and the communication technology, the large Power System Interconnection of country becomes a kind of obvious trend, so that electrical network scale progressively increases, and distributed new is grid-connected more and more, this is in the urgent need to implementing wide area measurement, collective analysis to electrical network phasor.What at present electric system is carried out to wide area measurement mainly relies on is PMU (phasor measurement unit), due to its cost and installation and maintenance expense more expensive, thereby PMU mounting points is only confined to electric power system power plant or transformer station, it on a large scale, highdensity layouting be restricted.Yet, in user's side electrical network, also exist a large amount of valuable large electrical network multidate informations, especially frequency characteristic, because its information does not change with electric pressure, when monitoring frequency and change, can obtain the frequency response of whole electrical network, so the degree of depth is excavated electric system low-pressure side phasor information to large power grid operation important in inhibiting.
Summary of the invention
In order to address the above problem, the invention provides a kind of high performance 220V user's side synchronous phasor measuring device that can realize electrical power system wide-area measurement, cost is low, flexible for installation, need not be arranged in generating plant or transformer station.
Technical scheme provided by the invention is: a kind of 220V user's side synchronous phasor measuring device, comprises main CPU unit and from CPU element, the two realizes seamless link by serial peripheral equipment interface SPI; Main CPU unit is connected with 220V AC network by signal acquisition process unit, and utilize FFT conversion to obtain the phasor information in AC network, main CPU unit is also connected with display unit with data storage cell, and by the duty of Keyboard Control data storage cell and display unit; From CPU element, receive the phasor information of main CPU unit, thereby and be connected the correct time information that obtains with synchronous clock unit, thereby by be connected with communication unit will with time target phasor communication to server terminal.
As optimal way of the present invention, main CPU unit and all adopt data signal processor from CPU element, wherein data signal processor is TMS320F2812 type; Signal acquisition process unit comprises voltage transformer (VT) and auxiliary circuit, frequency overlapped-resistable filter, biasing circuit and A/D modular converter, and wherein the A/D chip in A/D modular converter is ADS8364 type; Keyboard comprises four independently buttons; Display unit comprises LCD MODULE, and wherein LCD MODULE is FYD12864-0402B type; Synchronous clock unit comprises GPS receiver and outer clock circuit, and wherein GPS receiver is M12T type; Communication unit comprises CAN bus and ethernet communication module.
In the present invention, the specific works step of main CPU unit is:
(1) system initialization;
(2) wait for from CPU element and send and receive sampled data instruction; Receive A/D sampled data, take 65 sampled points as a data window, and open its built-in EVB general purpose timer 3 enable bit simultaneously, start counting;
(3) call FFT function, with sample sequence
Figure 790035DEST_PATH_IMAGE001
with
Figure 729042DEST_PATH_IMAGE002
carry out twice 64 FFT conversion, obtain amplitude and the phase angle of voltage, utilize phase angle change rate, obtain the frequency in electrical network;
(4) keyboard scan information, carries out data storage and display operation;
(5) voltage magnitude of calculating, phase angle and frequency are put into SPI and sent buffer register, and send slave data receiver enable signal, phasor value is sent to from CPU element, receive time and positional information from CPU element simultaneously;
(6) every 0.1s enters the cycle interruption of EVB general purpose timer 3, again receives sampled data, returns to execution step (3).
In the present invention, from the specific works step of CPU element, be:
(1) system initialization;
(2) wait for the time that receives synchronous clock unit; By interrupt mode, follow the tracks of 1PPS signal, take its rising edge as benchmark, utilize its built-in timer internal, the Synchronous Sampling Pulse of output 3200Hz, receives with the fifo mode of serial communication interface SCI the temporal information that synchronous clock unit provides;
(3) to main CPU unit, send an instruction that receives sampled data;
(4) receive the voltage phasor value that main CPU unit calculates, integrate the phasor value and the temporal information that receive, obtain the electrical network phasor of sequential;
(5) will with time target data by CAN bus, turn Ethernet mode and send to server terminal.
Compared with prior art, the major function that the present invention realizes has:
(1) real-time online measuring 220V user side electrical network phasor, comprises voltage magnitude, phase angle and frequency;
(2) utilize GPS receiver, for the whole network provides unified time tag, obtain current time and longitude and latitude accurately;
(3) by CAN bus, turn Ethernet mode, being connected between implement device and server terminal, real time high-speed transmission data.
Compared with prior art, beneficial effect of the present invention is:
(1) user's side electrical network phasor is implemented to wide area measurement, collective analysis, for power system stability operation provides reliable foundation;
(2) adopt dual-cpu structure, real-time and efficiently to electrical network phasor information and transmission;
(3) voltage signal gathering is carried out to FFT conversion, obtain the fundamental phasors of signal, the rate of change of recycling phase angle obtains mains frequency value;
(4) adopt GPS technology to provide unified time tag for the whole network, thereby and after making to lose gps signal in conjunction with outer clock circuit device can also have correct time information;
(5) by CAN bus, turn the communication between Ethernet mode implement device and server, data with time tag are transferred to server terminal real-time, server is collected the information of different device, electrical network is carried out to collective analysis, thereby obtain fast the multidate information of electrical network.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present invention;
Fig. 2 is signal acquisition process cellular construction schematic diagram in the present invention;
Fig. 3 is A/D chip and main CPU unit connection diagram in the present invention;
Fig. 4 is main CPU unit and keyboard and display unit connection diagram in the present invention;
Fig. 5 be in the present invention synchronous clock unit with from CPU element connection diagram;
Fig. 6 is main CPU unit workflow diagram in the present invention;
Fig. 7 is from CPU element workflow diagram in the present invention.
Embodiment
Below in conjunction with accompanying drawing, with specific embodiment, the present invention is described in further detail, the technician in described field, after having read this specific embodiment, can realize technical solutions according to the invention, also can embody advantage of the present invention and good effect simultaneously.
As shown in Figure 1, a kind of 220V user's side synchronous phasor measuring device provided by the invention, comprises main CPU unit and from CPU element, the two realizes seamless link by serial peripheral equipment interface SPI; Main CPU unit is connected with 220V AC network by signal acquisition process unit, and utilize FFT conversion to obtain the phasor information in AC network, main CPU unit is also connected with display unit with data storage cell, and by the duty of Keyboard Control data storage cell and display unit; From CPU element, receive the phasor information of main CPU unit, thereby and be connected the correct time information that obtains with synchronous clock unit, thereby by be connected with communication unit will with time target phasor communication to server terminal.
As shown in Figure 2, signal acquisition process unit mainly comprises voltage transformer (VT) and auxiliary circuit, Anti-aliasing Filter Circuits, biasing circuit and A/D modular converter, and 220V AC network, voltage transformer (VT) and auxiliary circuit thereof, Anti-aliasing Filter Circuits, biasing circuit and A/D modular converter are connected successively.220V ac voltage signal is through voltage transformer (VT), forceful electric power signal is converted to weak electric signal, then exports to successively after Anti-aliasing Filter Circuits and biasing circuit, finally passes to A/D modular converter, obtain the instantaneous value of voltage, main CPU unit utilizes FFT conversion to obtain the fundametal compoment of voltage signal.
As shown in Figure 3, the A/D chip in A/D modular converter is selected high-precision 16 ADS8364 types, and maximum operation frequency can reach 5MHz, and internal reference voltage 2.5V is provided.The data bus of A/D chip is connected with the external memory unit of main CPU unit, data parallel is transferred in the external memory storage of main CPU unit, EOC signal is connected with external interrupt 1 pin of main CPU unit, address signal is provided by the GPIO mouth of main CPU unit, clock signal is by the EVA(task manager A of main CPU unit) produce PWM waveform, A/D starts switching signal by providing from CPU element timer internal.
Because biasing circuit output signal range is 0.04 ~ 2.4V, scope corresponding to A/D sampled value is 524 ~ 31456, therefore according to the linear relationship of A/D sampled value and input signal, calculates actual value, and concrete calculating is as follows in formula:
Figure 177603DEST_PATH_IMAGE003
(1)
Wherein:
Figure 444636DEST_PATH_IMAGE004
output valve for signal condition;
Figure 705853DEST_PATH_IMAGE005
with
Figure 437049DEST_PATH_IMAGE006
maximal value and minimum value for signal condition output;
Figure 994194DEST_PATH_IMAGE007
for A/D sampled value.
As shown in Figure 4, display unit comprises LCD MODULE, and wherein LCD MODULE is selected FYD12864-0402B type.Keyboard comprises four independently buttons, comprises and moves, moves down, returns and confirm function, and main CPU unit can complete the control to LCD MODULE median surface by keyboard.In master menu, on move and lower shifting function shows by moving up and down dynamically of vernier, in the time need to showing the definite information of a certain index, while only needing vernier to move so far index location, press acknowledgement key and can see the definite information of this index, by return key, return to master menu.
Main CPU unit is mated and should be followed following condition with the sequential between LCD MODULE: when read operation, it is more than high level 140ns should keeping enable signal E; When write operation, before enable signal E becomes low level, more than data should keep 40ns; The time interval of two data reading and writing should be greater than 1200ns.
Between main CPU unit and LCD MODULE, by parallel communications pattern, LCD MODULE is controlled by main CPU unit, carries out the demonstration of information, and the content of demonstration mainly contains: (1) voltage magnitude, phase angle and frequency; (2) time and geographical location information.
As shown in Figure 5, synchronous clock unit comprises GPS receiver and outer clock circuit, and wherein GPS receiver is M12T type, and clock chip is DS1302 type.GPS receives function 1PPS signal and temporal information is provided, and this time can be local time or UTC time.1PPS signal is connected with external interrupt 1 pin from CPU element.Temporal information is transferred to from CPU element by serial ports, utilizes the fifo mode receiving time information of SCI from CPU element.Outer clock circuit can guarantee that device can also obtain correct time information when GPS receiver loss signal.
In the present invention, main CPU unit and all adopt data signal processor from CPU element, all selects TMS320F2812 type, have powerful data-handling capacity and abundant peripheral hardware for, can meet the requirement of complicated algorithm computing.Main CPU unit and be divided into following components from CPU element major function in the present invention:
(1) utilize SPI communication, realize the seamless link between two CPU element;
(2) control A/D modular converter, obtain the instantaneous value of voltage;
(3) utilize its built-in timer internal, output Synchronous Sampling Pulse;
(4) receive time and the positional information of synchronous clock unit, obtain the latitude and longitude information of UTC time and device accurately;
(5) utilize FFT conversion, obtain the fundamental phasors of voltage, and by the rate of change of phase angle, obtain the frequency values of electrical network;
(6) stamp time tag to phasor information, obtain the electrical network phasor of sequential;
(7) start transmitting element, will with time target data by CAN bus, turn Ethernet mode and be transferred to server terminal;
(8) receive keyboard instruction, carry out data storage and display operation.
As shown in Figure 6, be main CPU unit workflow diagram, its specific works step is:
(1) system initialization: data signal processor system initialization, GP configuring IO mouth, interrupt vector program; The initialization of A/D modular converter, is mainly initialization register, reset operation, translative mode; Display unit initialization, mainly comprises the operations such as startup, cls; SPI carries out initialization setting;
(2) the data receiver instruction that utilizes external interrupt 2 to follow the tracks of since CPU element, take its rising edge as benchmark, starts to receive the numerical value of A/D modular converter conversion, take 65 sampled points as a data window, and the general purpose timer 3 of simultaneously opening EVB starts regularly;
(3) use formula (1), convert sampled value to actual value, then carry out after Q format conversion, utilize the FFT conversion of 64, obtain the fundametal compoment of voltage signal, pass a sampled point, carry out equally 64 FFT conversion, the rate of change by phase angle obtains frequency values;
(4) scanning button, carries out data demonstration and storage operation;
(5) the voltage phasor value calculating is sent in cache register, by SPI module, sends data to from CPU element;
(6) the every 0.1s of general purpose timer 3 enters cycle interruption, returns to execution step (3).
As shown in Figure 7, for from CPU element workflow diagram, its specific works step is:
(1) system initialization: data signal processor system initialization, GP configuring IO mouth, interrupt vector program; The initialization of GPS receiver, receives local latitude and longitude information, reduces start-up time; CAN bus initialization, sets operations such as sending baud rate, byte length, mailbox priority;
(2) wait for 1PPS signal and the temporal information of GPS receiver, if lose gps time signal, by outer clock circuit, provide the current time;
(3) take 1PPS rising edge as benchmark, utilize timer internal 0 output Synchronous Sampling Pulse, and send data receiver instruction to main CPU unit;
(4) receive the phasor information of main CPU unit, integrate the UTC time, obtain the electrical network phasor information of sequential;
(5) will with time target data by CAN bus, turn Ethernet mode and be transferred to server terminal.
The foregoing is only preferred embodiment of the present invention, it is not limitation of the invention, relating in this manual other technology contents and technical term should understand and implement according to the common practise of this area and habitual technological means, also can enforcement be set by rational analysis ratiocination.

Claims (10)

1. 220V user's side synchronous phasor measuring device, is characterized in that: comprise main CPU unit and from CPU element, the two realizes seamless link by serial peripheral equipment interface SPI; Main CPU unit is connected with 220V AC network by signal acquisition process unit, and utilize FFT conversion to obtain the phasor information in AC network, main CPU unit is also connected with display unit with data storage cell, and by the duty of Keyboard Control data storage cell and display unit; From CPU element, receive the phasor information of main CPU unit, thereby and be connected the correct time information that obtains with synchronous clock unit, thereby by be connected with communication unit will with time target phasor communication to server terminal.
2. a kind of 220V user's side synchronous phasor measuring device according to claim 1, is characterized in that:
Described main CPU unit and all adopt data signal processor from CPU element.
3. a kind of 220V user's side synchronous phasor measuring device according to claim 2, is characterized in that: described data signal processor is TMS320F2812 type.
4. a kind of 220V user's side synchronous phasor measuring device according to claim 1, it is characterized in that: described signal acquisition process unit comprises voltage transformer (VT) and auxiliary circuit, frequency overlapped-resistable filter, biasing circuit and A/D modular converter, and wherein the A/D chip in A/D modular converter is ADS8364 type.
5. a kind of 220V user's side synchronous phasor measuring device according to claim 1, is characterized in that: described keyboard comprises four independently buttons.
6. a kind of 220V user's side synchronous phasor measuring device according to claim 1, is characterized in that: described display unit comprises LCD MODULE, and wherein LCD MODULE is FYD12864-0402B type.
7. a kind of 220V user's side synchronous phasor measuring device according to claim 1, is characterized in that: described synchronous clock unit comprises GPS receiver and outer clock circuit, and wherein GPS receiver is M12T type.
8. a kind of 220V user's side synchronous phasor measuring device according to claim 1, is characterized in that: described communication unit comprises CAN bus and ethernet communication module.
9. according to arbitrary described a kind of 220V user's side synchronous phasor measuring device in claim 1-7, it is characterized in that: the specific works step of main CPU unit is:
(1) system initialization;
(2) wait for from CPU element and send and receive sampled data instruction; Receive A/D sampled data, take 65 sampled points as a data window, and open its built-in EVB general purpose timer 3 enable bit simultaneously, start counting;
(3) call FFT function, with sample sequence
Figure 2013103976783100001DEST_PATH_IMAGE001
with
Figure 939991DEST_PATH_IMAGE002
carry out twice 64 FFT conversion, obtain amplitude and the phase angle of voltage, utilize phase angle change rate, obtain the frequency in electrical network;
(4) keyboard scan information, carries out data storage and display operation;
(5) voltage magnitude of calculating, phase angle and frequency are put into SPI and sent buffer register, and send slave data receiver enable signal, phasor value is sent to from CPU element, receive time and positional information from CPU element simultaneously;
(6) every 0.1s enters the cycle interruption of EVB general purpose timer 3, again receives sampled data, returns to execution step (3).
10. according to arbitrary described a kind of 220V user's side synchronous phasor measuring device in claim 1-7, it is characterized in that: from the specific works step of CPU element, be:
(1) system initialization;
(2) wait for the time that receives synchronous clock unit; By interrupt mode, follow the tracks of 1PPS signal, take its rising edge as benchmark, utilize its built-in timer internal, the Synchronous Sampling Pulse of output 3200Hz, receives with the fifo mode of serial communication interface SCI the temporal information that synchronous clock unit provides;
(3) to main CPU unit, send an instruction that receives sampled data;
(4) receive the voltage phasor value that main CPU unit calculates, integrate the phasor value and the temporal information that receive, obtain the electrical network phasor of sequential;
(5) will with time target data by CAN bus, turn Ethernet mode and send to server terminal.
CN201310397678.3A 2013-09-05 2013-09-05 220V synchronous phasor measurement device on user side Pending CN103513105A (en)

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WO2015157989A1 (en) * 2014-04-18 2015-10-22 华北电力大学 Synchronous phasor measurement method applicable to p-type phasor measurement unit (mpu)
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CN105242225A (en) * 2015-09-06 2016-01-13 中国电力科学研究院 Dynamic phasor measurement device calibration system and calibration method thereof
CN105182073B (en) * 2015-09-06 2018-11-20 中国电力科学研究院 A kind of the dynamic phasor measurement system and its measurement method of synchronous phasor measuring device
CN105242225B (en) * 2015-09-06 2019-03-22 中国电力科学研究院 A kind of calibration system and its calibration method of dynamic phasor measurement device
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CN111157784A (en) * 2019-12-31 2020-05-15 浙江华云信息科技有限公司 Multi-loop electric measurement synchronous sampling device and sampling method thereof
CN111983407A (en) * 2020-08-26 2020-11-24 河南四达电力设备股份有限公司 Live detection method and device for insulation state of distribution cable

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Application publication date: 20140115