CN102761099B - Protection device with synchronization function in digital substation and synchronization method - Google Patents
Protection device with synchronization function in digital substation and synchronization method Download PDFInfo
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- CN102761099B CN102761099B CN201110110661.6A CN201110110661A CN102761099B CN 102761099 B CN102761099 B CN 102761099B CN 201110110661 A CN201110110661 A CN 201110110661A CN 102761099 B CN102761099 B CN 102761099B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 50
- 230000001360 synchronised effect Effects 0.000 claims description 53
- 230000001681 protective effect Effects 0.000 claims description 46
- 238000005070 sampling Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 3
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- 239000013307 optical fiber Substances 0.000 description 2
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Abstract
The invention discloses a protection device with a synchronization function in a digital substation and a synchronization method utilizing the protection device. The protection device comprises a main CPU (central processing unit) and multiple communication CPUs in data communication with the main CPU, and each communication CPU comprises a message decoding circuit. By the protection device with the synchronization function in the digital substation, protection of a logical algorithm is completed, synchronization of voltage and current signals is realized, and the number of devices is reduced, so that a substation system is simpler in structure and lower in cost; PWM (pulse-width modulation) signals of the main CPU are taken as synchronization pulse control signals, so that no outside synchronization device is needed, and the protection device is free of delay error and more accurate in synchronization control effect; and in addition, a hardware circuit is adopted to obtain sampling time of sampling points of an electronic mutual inductor, so that accuracy is high and error is small.
Description
Technical field
The present invention relates to the protective device with synchronizing function in a kind of digital transformer substation and synchronous method.
Background technology
In digital transformer substation, protective device by gathering voltage and current signal in electrical network, and adopts certain protection algorism to determine point closing operation of protected device switch.But protective device, when carrying out protection algorism, needs the voltage and current signal of synchronization, and this just exists voltage and current signal stationary problem.The scheme that present most of producers adopt is: GPS timing device is signal when merge cells provides pair; synchronization pulse is sent to instrument transformer again by merge cells; thus ensure that the synchronism of electronic type voltage transformer and electronic current mutual inductor sampled signal; merge cells is sent to corresponding protective device by optical fiber after current signal and voltage signal being merged; now be spaced apart example with one to be described, as shown in Figure 1.
As can be seen from Figure 1, signal synchronizing function is realized jointly by GPS timing device, merge cells and instrument transformer, although this can reach the object of synchronizing voltage, current signal, also improves the complexity of system simultaneously, adds system cost.
Summary of the invention
The object of the invention is to solve the problems referred to above occurred in prior art, the protective device with synchronizing function in a kind of digital transformer substation is provided.
The protective device with synchronizing function in digital transformer substation of the present invention, comprise: host CPU, for sending PWM synchronous control signal and receiving signal that communication CPU transmits and carry out relay protective scheme algorithm, then generate the control signal of Control protection switch on and off and this control signal sent to the digital terminal of protective device outside, multiple communication CPU, that described communication CPU and described host CPU carry out data communication and be connected with electronic mutual inductor, wherein, each communication CPU comprises message decoding circuit, this message decoding circuit receive come from electronic mutual inductor include the message of sampled value after, record receives the moment of message first character joint, communication CPU is used for while receiving PWM synchronous control signal, record receives the moment of PWM synchronous control signal, and according to the moment receiving message first character joint in the moment and message decoding circuit record that receive PWM synchronous control signal, calculate the sampled value of signal when receiving the moment of PWM synchronous control signal that electronic mutual inductor exports, realize the synchronous of signal thus, and send to described host CPU to carry out relay protective scheme algorithm the signal after synchronous.
In one embodiment, the protective device with synchronizing function in digital transformer substation of the present invention also comprises for translating address and each communication CPU being distributed to the decoding circuit of unique address, and described host CPU controls this decoding circuit by address bus.
In one embodiment, described multiple communication CPU and described host CPU carry out data communication by parallel data bus line.
In one embodiment, described host CPU and described communication CPU are DSP2407 chip.
The invention also discloses a kind of synchronous method utilizing above-mentioned protective device, the method comprises the steps: that host CPU sends PWM synchronous control signal, communication CPU receive come from electronic mutual inductor include the message of sampled value after, by message decoding circuit record receive message first character joint moment, communication CPU is while receiving PWM synchronous control signal, record receives the moment of PWM synchronous control signal, and receiving the moment of message first character joint and receiving the moment of PWM synchronous control signal according to message decoding circuit record, calculate the sampled value of signal when receiving the moment of PWM synchronous control signal that electronic mutual inductor exports, realize the synchronous of signal thus, and send to host CPU to carry out relay protective scheme computing the signal after synchronous, host CPU generates the control signal of Control protection switch on and off and this control signal is sent to the digital terminal of protective device outside.
Protective device of the present invention, not only completes relay protective scheme algorithm, and also achieves the synchronous of voltage and current signal, decreases the quantity of device, makes that transformer substation system structure is more simple, cost is lower.Utilize the pwm signal of host CPU as synchronized-pulse control signal, without the need to external sync device, there is not time delay error, Synchronization Control effect is more accurate; In addition, the present invention adopts hardware circuit to obtain the sampling instant of electronic mutual inductor sampled point, and precision is high, and error is little.
Accompanying drawing explanation
Fig. 1 is the signal flow graph using prior art synchronizing voltage and current signal;
Fig. 2 is the structural representation of protective device of the present invention;
Fig. 3 is signal flow graph when using protective device of the present invention;
Fig. 4 is that the linear interpolation method that utilizes of the present invention realizes the synchronous schematic diagram of signal;
Fig. 5 is the schematic diagram of linear interpolation algorithm.
Embodiment
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Fig. 2 is the structural representation of protective device of the present invention, and as shown in Figure 2, protective device of the present invention comprises host CPU 1, multiple communication CPU 21,22,23,24, and each communication CPU has message decoding circuit.Wherein, host CPU 1 is for carrying out relay protective scheme algorithm and sending PWM synchronous control signal; then generate the control signal of Control protection switch on and off and this control signal sent to the digital terminal of protective device outside, by the break-make of this digital terminal Control protection switch.Message decoding circuit be used for receive that electronic mutual inductor sends include the message of sampled value after in, record receives the moment of message first character joint.Multiple communication CPU 21,22,23,24 and host CPU 1 carry out data communication preferably by parallel data bus line D0-D15; and be connected with electronic mutual inductor, the signal after synchronous also sends to host CPU 1 to carry out relay protective scheme computing by the signal exported for synchronous electronic mutual inductor.In one embodiment, host CPU 1 and communication CPU 21,22,23,24 are DSP2407 chip.
This protective device also comprises decoding circuit 3, and host CPU 1 controls this decoding circuit 3 by address bus A0-A7.Decoding circuit 3 for translating address and distributing unique address to each communication CPU so that host CPU 1 communicates with each communication CPU.
For example, as shown in Figure 2, communication CPU 21,22 processes for the fiber-optic signal exported electronic current mutual inductor; Communication CPU23,24 processes for the fiber-optic signal exported electronic type voltage transformer.Although it should be noted that in Fig. 2 and 2 road signals have been shown, 4 communication CPU, protective device of the present invention also can increase the quantity of communication CPU, to realize the synchronous of multiple signals.Hereafter the synchronizing function of protective device of the present invention will be described for Fig. 2.
Undistorted for ensureing data; better to data analysis; electronic mutual inductor all adopts the mode of over-sampling; now sample 128 for the every cycle of electronic mutual inductor and be described; because these sampled points are free sampled point at equal intervals; (mains frequency is 50HZ at every cycle for voltage signal and current signal; so locating every cycle is 20mS) in sampled point not synchronous; these data can not be directly applied to relay protective scheme computing, therefore first synchronization is carried out to free sampled point in communication CPU.Implementation method is as follows: the every cycle of host CPU 1 sends 32 PWM synchronous control signals, each communication CPU 21,22,23,24 is while receiving pwm control signal, record receives the moment of pwm control signal pulse, each communication CPU adopts same crystal oscillator as clock timing, thus ensure the synchronism of each communication CPU institute writing time, and calculate in the sampled value receiving that moment of control signal pulse by linear interpolation method, ensure the synchronous of electric current and voltage signal sampling point with this.As shown in Figure 4, two waveforms represent analog current signal and analog voltage signal respectively; Black color dots represents the actual samples point of electronic mutual inductor output current/voltage signal; Vertical line represents the pwm control signal that host CPU sends, if every cycle sends 32 control signals, then the time interval Ts between adjacent two control signals is 0.625mS.
Part in dotted line frame in Fig. 4 is amplified, namely as shown in Figure 5, according to linear difference method, has following relational expression:
(Y
T-Y
i)*(T
i+1-T
i)＝Δt*(Y
i+1-Y
i)
When calculating the magnitude of voltage Y in T moment
ttime, Y
i+1and Y
ifor datum, the time difference (T between Δ t and two sampled points only need be known
i+1-T
i), this just needs communication CPU 21,22,23,24 can record the sampling instant of instrument transformer.
Protective device of the present invention adopts unique hardware circuit design, solves the problem that the mutual inductor sample moment precisely records dexterously.Electronic mutual inductor carries out equal interval sampling with the respective fixed cycle, and sampled value is real-time transmitted to protective device with message form.Particularly; message is sent to the message decoding circuit of the communication CPU of protective device by optical fiber; message decoding circuit, while reception message, receives the moment of message first character joint, thus makes communication CPU 21,22,23,24 can determine the sampling instant of instrument transformer with hardware mode record.Therefore, can accurately calculate in the sampled value receiving that moment of control signal pulse, sampled point is synchronous.Subsequently, after signal is synchronous, the signal after synchronous sends to host CPU 1 to carry out relay protective scheme computing by parallel data bus line D0-D15 by communication CPU 21,22,23,24.
The invention also discloses a kind of synchronous method utilizing above-mentioned protective device, it comprises the following steps:
Host CPU sends PWM synchronous control signal;
Communication CPU receive come from electronic mutual inductor comprise the message of sampled value after, by message decoding circuit record receive first word of text joint moment;
Communication CPU is while receiving PWM synchronous control signal, record receives the moment of PWM synchronous control signal, and according to message decoding circuit record receive message first character joint moment (because message time delay is in the transmission extremely short, in addition the time of each message delay is fixed, for equally spaced sampling, the error of calculation can not be caused, then the moment receiving first word of text joint of message decoding circuit record can be similar to sampling instant) and receive moment of PWM synchronous control signal, calculate the sampled value of signal when receiving the moment of PWM synchronous control signal that electronic mutual inductor exports, realize the synchronous of signal thus, and send to host CPU to carry out relay protective scheme computing the signal after synchronous, host CPU generates the control signal of Control protection switch on and off and this control signal is sent to the digital terminal of protective device outside.
Protective device of the present invention, not only completes relay protective scheme algorithm, and also achieves the synchronous of voltage and current signal, decreases the quantity of device, makes that transformer substation system structure is more simple, cost is lower, as shown in Figure 3; Adopt parallel data bus line to carry out data communication between each CPU, communication speed is fast; Utilize the pwm signal of host CPU as synchronized-pulse control signal, without the need to external sync device, there is not time delay error, Synchronization Control effect is more accurate; In addition, the present invention adopts hardware circuit to obtain the sampling instant of electronic mutual inductor sampled point, and precision is high, and error is little, and worst error is only 1.2/1000ths.
Finally it should be noted that, the foregoing is only better embodiment of the present invention, instead of the restriction to technical solution of the present invention, any equivalent replacement of doing the technology of the present invention feature or corresponding improvement, still within protection scope of the present invention.
Claims (5)
1. the protective device with synchronizing function in digital transformer substation, is characterized in that, comprising:
Host CPU, for sending PWM synchronous control signal and receiving signal that communication CPU transmits and carry out relay protective scheme algorithm, then generates the control signal of Control protection switch on and off and this control signal is sent to the digital terminal of protective device outside;
Multiple communication CPU, described communication CPU carries out data communication with described host CPU and is connected with electronic mutual inductor, wherein, each communication CPU comprises message decoding circuit, this message decoding circuit receive come from electronic mutual inductor include the message of sampled value after, record receives the moment of message first character joint, communication CPU is used for while receiving PWM synchronous control signal, record receives the moment of PWM synchronous control signal, and according to the moment receiving message first character joint in the moment and message decoding circuit record that receive PWM synchronous control signal, calculate the sampled value of signal when receiving the moment of PWM synchronous control signal that electronic mutual inductor exports, realize the synchronous of signal thus, and send to described host CPU to carry out relay protective scheme algorithm the signal after synchronous.
2. protective device as claimed in claim 1, is characterized in that, also comprise for translating address and each communication CPU being distributed to the decoding circuit of unique address, described host CPU controls this decoding circuit by address bus.
3. protective device as claimed in claim 1, it is characterized in that, described multiple communication CPU and described host CPU carry out data communication by parallel data bus line.
4. protective device as claimed in claim 1, it is characterized in that, described host CPU and described communication CPU are DSP2407 chip.
5. utilize a synchronous method for the protective device of claim 1, it is characterized in that, comprise the following steps:
Host CPU sends PWM synchronous control signal;
Communication CPU receive come from electronic mutual inductor include the message of sampled value after, by message decoding circuit record receive message first character joint moment;
Communication CPU is while receiving PWM synchronous control signal, record receives the moment of PWM synchronous control signal, and receiving the moment of message first character joint and receiving the moment of PWM synchronous control signal according to message decoding circuit record, calculate the sampled value of signal when receiving the moment of PWM synchronous control signal that electronic mutual inductor exports, realize the synchronous of signal thus, and send to host CPU to carry out relay protective scheme computing the signal after synchronous, host CPU generates the control signal of Control protection switch on and off and this control signal is sent to the digital terminal of protective device outside.
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| CN101980416A (en) * | 2010-10-15 | 2011-02-23 | 中国南方电网有限责任公司超高压输电公司柳州局 | Method for realizing sampling value synchronization in intelligent substation system |
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| CN101980416A (en) * | 2010-10-15 | 2011-02-23 | 中国南方电网有限责任公司超高压输电公司柳州局 | Method for realizing sampling value synchronization in intelligent substation system |
Non-Patent Citations (2)
| Title |
|---|
| 电子式互感器数据同步的研究;曹团结等;《电力系统及其自动化学报》;20070430;第19卷(第2期);第108-113页 * |
| 高压线路新型微机保护装置的研究与开发;曹团结;《中国优秀硕士学位论文全文数据库工程科技II辑》;20080715(第7期);第6－8、22－30页 * |
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Inventor after: Liu Yongmeng Inventor after: Tian Zhigang Inventor after: Li Hao Inventor after: Yang Chunli Inventor after: Qi Hailong Inventor after: Zhang Wei Inventor after: Wang Yiming Inventor after: Han Xuguang Inventor before: Tian Zhigang Inventor before: Li Hao Inventor before: Yang Chunli Inventor before: Qi Hailong Inventor before: Zhang Wei Inventor before: Liu Yongmeng Inventor before: Wang Yiming Inventor before: Han Xuguang |
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Granted publication date: 20150422 |