CN102768314A - Double-closed-loop testing device for intelligent substation and control method thereof - Google Patents
Double-closed-loop testing device for intelligent substation and control method thereof Download PDFInfo
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Abstract
The invention discloses a double-closed-loop testing device for an intelligent substation. The double-closed-loop testing device is characterized by comprising a main control board unit, a digital/analog conversion unit, a power amplification unit, a feedback loop switching unit, an analog/digital conversion unit, a liquid crystal display unit, a network communication unit and a power supplying unit which provides different voltages for various units of the device. The device is combined with an upper computer software platform and a master clock, and the connecting reliability of secondary equipment of the substation such as a merging unit, a network switch, a relay protection device, a measurement control device, a safety control device, a metering device and a background monitoring system and the configuration accuracy can be tested. The device is provided with two closed loops, wherein by one closed loop for correcting zero drift of the units of the device, the degree of automation is increased, the workload of debugging personnel for the device is reduced, the maintenance of the device is reduced, and the field debugging personnel of the intelligent substation can correct the system error before an experiment; and by the other closed loop, the output quantity of the double-closed-loop testing device can be monitored in real time, and the output waveform in a steady state is corrected according to a detection value.
Description
Technical field
The present invention relates to intelligent substation test, test field, specifically is two closed-loop testing devices of a kind of intelligent substation and control method.
Background technology
The intelligent grid fast development, according to State Grid Corporation of China's planning, China will build up a large amount of intelligent substations, and the test method of old intelligent substation secondary side can not meet the demands, and need inquire into out brand-new test method.At first existing apparatus does not all have closed loop, has only through path, thereby can not revise in real time the waveform that sends, and can not observe the waveform that self sends; Secondly existing apparatus does not all have closed loop, has only through path, thereby measurement is manually regularly measured in the drift that can not accomplish power amplifier unit automatically; In the existing apparatus, such as relay-protection tester, number of active lanes is limited once more, can only carry out reaying protection test to single protective device or 2-3 platform protective device, can not make an experiment to all circuits of secondary side simultaneously; Event need improve.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, this provide a kind of combine the upright platform of upper computer software and major clock to the time intelligent substation pair closed-loop testing devices.
The present invention realizes like this; Construct the two closed-loop testing devices of a kind of intelligent substation, it is characterized in that: include master control borad unit, D/A conversion unit, power amplification unit, feedback loop switch unit, AD conversion unit, liquid crystal display, network communication unit and provide the power supply of voltage that the unit is provided for each unit of device; Said master control borad unit is connected communication with network communication unit; The master control borad unit also is connected communication with D/A conversion unit; D/A conversion unit is connected communication with power amplification unit; The feedback loop switch unit is connected communication with power amplification unit with AD conversion unit, AD conversion unit is connected communication with the master control borad unit, and liquid crystal display connects the master control borad unit.
According to the two closed-loop testing devices of a kind of intelligent substation of the present invention, it is characterized in that: said D/A conversion unit comprises D/A modular converter, filtration module and protection module 104c;
Said D/A modular converter is used for simulated digital amount conversion of signals is become simulating signal; Said filtration module is used to filter the signal that disturbs power frequency 50Hz frequency; Said protection module 104c is used for rear end D/A modular converter and power amplification unit are isolated.
According to the two closed-loop testing devices of a kind of intelligent substation of the present invention, it is characterized in that: said AD conversion unit comprises protection module 107a, signal condition module and A/D modular converter; Said protection module 107a is used to isolate rear end A/D modular converter and front end power amplification unit; The signal condition module is used for the above signal of filtering 100Hz, and anti-aliasing filter.
According to the two closed-loop testing devices of a kind of intelligent substation of the present invention, it is characterized in that: network communication unit comprises communication network module and setting network module, and said communication network module is used to connect the host computer emulation platform, carries out data interaction; Said setting network module be used for main frame to the time, make this device be synchronized with major clock.
According to the two closed-loop testing devices of a kind of intelligent substation of the present invention; It is characterized in that: the feedback loop switch unit comprises feedback control loop control module and mutual inductor module, and said mutual inductor module is used for the electric current that meets electric power standard, voltage transitions are become the voltage signal that can directly be gathered by AD conversion unit.
According to the two closed-loop testing devices of a kind of intelligent substation of the present invention; It is characterized in that: said master control borad unit comprises the FPGA processor and goes out three-dimensional DSP at a high speed; Said FPGA processor is responsible for handling from the emulated data of the emulation platform row of channels of going forward side by side and is distributed; And in corrective system drift process, revise the drift value and revise the emulation steady-state value in the emulated data process normal the transmission; Said DSP is responsible for gathering output data and calculates, and draws modified value and control liquid crystal display.
This device of root can simulated intelligence transformer station the characteristic of conventional mutual inductor; The electric analog data-switching of upper computer software emulation platform is become to meet electric current, the voltage of intelligent substation standard; Before using this device to do experiment, the error correction of whole device be can accomplish automatically, the drift of power amplification unit, the error of closed loop switch unit, the error of D/A conversion unit comprised through closed loop; Through closed loop the waveform that sends in real time and the waveform of reception and emulation platform are put in collection, after handling through Fast Fourier Transform (FFT), the waveform that can real time correction device sends.
The two closed loop test control methods of a kind of intelligent substation is characterized in that:
When normally sending emulated data:
At first, by extraneous software emulation platform emulation power failure, production figures amount, this system receive emulated data, and are stored in the master control borad unit through network communication unit, after the data channel allocation process, are ready for sending to D/A conversion unit;
Then, D/A conversion unit receives after the digital quantity signal of master control borad unit, with digital quantity signal convert to scope for-10V to+10V voltage analog signal, the processing through filtration module obtains clean sine wave signal;
Power amplification unit zooms into the big electric current that meets the electric system standard, big voltage with the small signal analog quantity that receives then, and sends to the merge cells of access;
The mutual inductor module of feedback loop switch unit then, the big electric current that no-load voltage ratio as required will send, big voltage unification convert scope to and are-5V the voltage signal to+5V;
Send AD conversion unit to through the later voltage signal of second-order filter then, will simulate the small-signal amount and convert digital quantity signal to, and prepare to send to the master control borad unit;
After last WT master control borad unit high speed processor DSP obtains the digital quantity of digital quantity and upper layer software (applications) emulation of AD conversion unit; Calculate difference between the amount of actual amount that sends and emulation through Fourier; Go out the modified value of next time sending according to algorithm computation successively, give FPGA processor this modified value;
Corrective system drift and error:
The at first touch through LCD MODULE; The FPGA processor transmits control signal for the loop switch unit; Inform that current device will get into system's drift and error correction state; The correction drift in the two closed loops of startup and the loop of error, all emulated data data and control signals that device shielding this moment emulation platform sends, and it is zero to make FPGA send to D/A conversion unit;
Pass through power amplification unit then, loop switch unit, AD conversion unit; The DC quantity that exists in the system is collected the master control borad unit; This moment, high speed processor DSP calculated drift and the error that exists in the system, write down this value, as normal conversion and the modified value of sending emulated data.
The invention has the advantages that: (1) this device is the output signal of the conventional mutual inductor of simulated intelligence transformer station; So, can test the connection reliability of secondary devices such as merge cells, the network switch, protective relaying device, measuring and controlling, peace control device, WT-MSR, background monitoring system in conjunction with the upper computer software platform.(2) this device can convert host computer electric analog small-signal to meet the intelligent substation requirement electric current, voltage signal.(3) this device has two closed loops; Wherein the closed loop of each unit drift of means for correcting has improved automaticity; Reduced device debugging personnel's workload, also reduced simultaneously the later maintenance of this device, let intelligent substation field adjustable personnel can be before experiment the corrective system error.(4) this device has two closed loops, and wherein the closed loop of normal monitoring device output quantity can detect output quantity, the output waveform in the time of can proofreading and correct stable state in real time.(5) this device has two closed loops, and wherein the closed loop of normal monitoring device output quantity has filter function.(6) this device and major clock time part and this device and the data interaction of host computer simulation software are partly adopted independently network portion, make data interaction and to the time do not disturb each other.(7) have with main frame to the time function, so can multi-platform combined use give each bar circuit of synchronous intelligent substation, transformer, female difference merge cells input current, voltage.(8) this device has liquid crystal touch screen, and is simple to operation.
Description of drawings
Fig. 1 is this device user mode block diagram.
Fig. 2 apparatus function unit module synoptic diagram.
Fig. 3 master control borad unit block diagram.
Fig. 4 D/A conversion unit block diagram.
Fig. 5 feedback loop switch unit block diagram.
Fig. 6 AD conversion unit block diagram.
Fig. 7 network communication unit block diagram.
Among the figure: 101, master control borad unit, 101a, FPGA processor, 101b, high speed processor DSP, 102, network communication unit; 103, liquid crystal display, 104, D/A conversion unit, 104a, D/A modular converter, 104b, filtration module; 104c, protection module, 105, power amplification unit, 106, the feedback loop switch unit, 106a, feedback control loop control module; 106b, mutual inductor module, 107, AD conversion unit, 107a, protection module; 107b, signal condition module, 107c, A/D modular converter, 108, power supply provides the unit.
Embodiment
Describe the present invention below in conjunction with accompanying drawing:
The present invention provides a kind of intelligent substation two closed-loop testing devices at this, includes master control borad unit 101, D/A conversion unit 104, power amplification unit 105, feedback loop switch unit 106, AD conversion unit 107, liquid crystal display 103, network communication unit 102 and device is realized that the power supply of voltage transitions provides unit 108.The power supply power supply unit converts alternating current 220V into the voltage of the needed various grades of device.Wherein the master control borad unit 101, accomplish data processing; Control liquid crystal display 103; Control digital-to-analogue unit 104; Control modulo unit 107, feedback loop switch unit 106, network communication unit 102.D/A conversion unit 104 wherein according to the invention is used for the electric analog data-switching is become analog current, voltage small-signal, uses to power amplification unit.Said power amplification unit 105 is used for converting analog current, voltage small-signal to meet the transformer substation communication standard electric current, voltage signal.Which bar closed loop work said feedback loop switch unit 106 is used to select.AD conversion unit 107 is used for converting analog current, voltage small-signal to meet master control borad unit 101 standards digital quantity signal.Said liquid crystal display 103 is used to the electric current, the amplitude of voltage signal, the phase angle information that show that current automated closed-loop proving installation sends, and the error amount that exists of system; And can select the state of said pair of closed loop through the touch button of liquid crystal display.Wherein said network communication unit 102 is used to receive the emulated data of upper computer software emulation platform, and wireless IEEE1588 to the time.
As shown in Figure 2: said master control borad unit 101 is connected communication with network communication unit 102; Master control borad unit 101 also is connected with D/A conversion unit 104; D/A conversion unit 104 is connected communication with power amplification unit 105; Feedback loop switch unit 106 is connected communication with power amplification unit 105 with AD conversion unit 107, and AD conversion unit 107 is connected communication with master control borad unit 101, and liquid crystal display 103 connects master control borad unit 101.
Said D/A conversion unit 104 comprises D/A modular converter 104a, filtration module 104b and protection module 104c.Said D/A modular converter 104a is used for simulated digital amount conversion of signals is become simulating signal; Said filtration module 104b is used for the signal that filters frequency except that power frequency 50Hz; Said protection module 104c is used for rear end D/A modular converter 104a and power amplification unit 105 are isolated.
Said AD conversion unit 107 comprises protection module 107a, signal condition module 107b and A/D modular converter 107c; Said protection module 107a is used to isolate rear end analog-to-digital conversion module 107 and front end power amplification unit 105; Signal condition module 107b is used for the above signal of filtering 100Hz, and anti-aliasing filter.
Network communication unit 102 comprises communication network module and setting network module, and said communication network module is used to connect the host computer emulation platform, carries out data interaction; Said setting network module be used for main frame to the time.
Feedback loop switch unit 106 comprises feedback control loop control module 106a and mutual inductor module 106b, and said mutual inductor module 106b is used for the electric current that meets electric power standard, voltage transitions are become the voltage small-signal that can directly be gathered by A/D modular converter 107c.
Said master control borad unit 101 comprises FPGA processor 101a and goes out at a high speed three-dimensional DSP101b, and said FPGA processor 101a is responsible for handling from the emulated data of the emulation platform row of channels of going forward side by side and distributes, and said DSP is responsible for gathering output data and calculates.
The two closed loop test control methods of a kind of intelligent substation,
When normally sending emulated data:
At first, by extraneous software emulation platform emulation power failure, production figures amount; This system receives emulated data, and is stored in master control borad unit 101 through network communication unit 102; After the data channel allocation process, be ready for sending to D/A conversion unit 104;
Then, D/A conversion unit 104 receives after the digital quantity signal of master control borad unit 101, with digital quantity signal convert to scope for-10V to+10V voltage analog signal, the processing through filtration module 104b obtains cleaner sine wave signal;
The mutual inductor module 106b of feedback loop switch unit 106 then, the big electric current that no-load voltage ratio as required will send, big voltage become scope and are-5V the voltage signal to+5V;
Send AD conversion unit 107 to through the later voltage signal of second-order filter then, will simulate the small-signal amount and convert digital quantity signal to, and prepare to send to master control borad unit 101;
After last master control borad unit high speed processor DSP obtains the digital quantity of digital quantity and upper layer software (applications) emulation of AD conversion unit 107; Calculate difference between the amount of actual amount that sends and emulation through Fourier; Go out the modified value of next time sending according to algorithm computation successively, give FPGA processor this modified value;
Corrective system drift and error:
At first pass through the touch of LCD MODULE 103; The FPGA processor transmits control signal for loop switch unit 106; Inform that current device will get into system's drift and error correction state; The correction drift in the two closed loops of startup and the loop of error, all data that device shielding this moment emulation platform sends, and FPGA will send zero to D/A conversion unit 104;
Pass through power amplification unit 105 then; Loop switch unit 106; AD conversion unit 107 collects master control borad unit 101 with the DC quantity that exists in the system, and this moment, high speed processor DSP101b calculated drift and the error that exists in the system; Write down this value, as normal conversion and the modified value of sending emulated data.
Master control borad unit 101 adopts the pattern of FPGA+DSP among the present invention, and FPGA processor 101a is responsible for handling from the emulated data of the emulation platform row of channels of going forward side by side and distributes.High speed processor DSP101b is responsible for gathering output data and calculates.D/A conversion unit comprises D/A modular converter, filtration module and protection module.The D/A modular converter is used for simulated digital amount conversion of signals is become simulating signal; Filtration module is used for the signal that filters frequency except that power frequency 50Hz; Protection module is used for rear end D/A module and power amplification unit are isolated.
Power amplification unit comprises that current signal amplifies and voltage signal amplifies.Feedback loop switch unit 106 comprises feedback control loop control module and mutual inductor module.Master control borad unit 101 is through a control signal wire Control and Feedback loop module, thus the work shape body of the two closed loops of selection; The mutual inductor module is used for the electric current that meets electric power standard, voltage transitions are become the voltage small-signal that can directly be gathered by the A/D chip; This module only is operated in when sending electric analog numerical value; And in the corrective system error process, be without this module, direct current signal is directly given AD conversion unit.AD conversion unit 107 comprises protection module, signal condition module and A/D modular converter.Protection module is used to isolate rear end modulo unit and front end power amplifier unit; The signal condition module is used for the above signal of filtering 100Hz, and anti-aliasing filter.Network communication unit 102 comprises communication network module and setting network module, and said communication network module is used to connect the host computer emulation platform, carries out data interaction; Said setting network module be used for main frame to the time.
Master control borad unit, D/A conversion unit, feedback loop switch unit, AD conversion unit; Constitute one of them closed loop of this device; Be used for measurement mechanism and normally send before the emulated data, the inherent error of the existence of the feedback loop switch unit described in described AD conversion unit, power amplification unit and the feedback control loop in the through path.
Master control borad unit, D/A conversion unit, feedback loop switch unit, AD conversion unit constitute another closed loop of this device, and when being used for measurement mechanism and normally sending emulated data, device is given the Wave data of follow-up tested device and calculated the error current value.
Claims (7)
1. the two closed-loop testing devices of intelligent substation is characterized in that: include master control borad unit (101), D/A conversion unit (104), power amplification unit (105), feedback loop switch unit (106), AD conversion unit (107), liquid crystal display (103), network communication unit (102) and provide the power supply of voltage that unit (108) is provided for each unit of device; Said master control borad unit (101) is connected communication with network communication unit (102); Master control borad unit (101) also is connected communication with D/A conversion unit (104); D/A conversion unit (104) is connected communication with power amplification unit (105); Feedback loop switch unit (106) is connected communication with power amplification unit (105) with AD conversion unit (107); AD conversion unit (107) is connected communication with master control borad unit (101), and liquid crystal display (103) connects master control borad unit (101).
2. the two closed-loop testing devices of a kind of intelligent substation according to claim 1, it is characterized in that: said D/A conversion unit (104) comprises D/A modular converter (104a), filtration module (104b) and protection module (104c);
Said D/A modular converter (104a) is used for simulated digital amount conversion of signals is become simulating signal; Said filtration module (104b) is used to filter the signal that disturbs power frequency 50Hz frequency; Said protection module (104c) is used for rear end D/A modular converter (104a) and power amplification unit (105) are isolated.
3. the two closed-loop testing devices of a kind of intelligent substation according to claim 1, it is characterized in that: said AD conversion unit (107) comprises protection module (107a), signal condition module (107b) and A/D modular converter (107c); Said protection module (107a) is used to isolate rear end A/D modular converter (107c) and front end power amplification unit (105); Signal condition module (107b) is used for the above signal of filtering 100Hz, and anti-aliasing filter.
4. the two closed-loop testing devices of a kind of intelligent substation according to claim 1; It is characterized in that: network communication unit (102) comprises communication network module and setting network module; Said communication network module is used to connect the host computer emulation platform, carries out data interaction; Said setting network module be used for main frame to the time, make this device be synchronized with major clock.
5. the two closed-loop testing devices of a kind of intelligent substation according to claim 1; It is characterized in that: feedback loop switch unit (106) comprises feedback control loop control module (106a) and mutual inductor module (106b), and said mutual inductor module (106b) is used for the electric current that meets electric power standard, voltage transitions are become the voltage signal that can directly be gathered by AD conversion unit.
6. the two closed-loop testing devices of a kind of intelligent substation according to claim 1; It is characterized in that: said master control borad unit (101) comprises FPGA processor (101a) and goes out three-dimensional DSP (101b) at a high speed; Said FPGA processor (101a) be responsible for to be handled from the emulated data of the emulation platform row of channels of going forward side by side and is distributed; And in corrective system drift process, revise the drift value and revise the emulation steady-state value in the emulated data process normal the transmission; Said DSP is responsible for gathering output data and calculates, and draws modified value and control liquid crystal display.
7. two closed loop test control methods of an intelligent substation is characterized in that:
When normally sending emulated data
At first, by extraneous software emulation platform emulation power failure, production figures amount; This system receives emulated data, and is stored in master control borad unit (101) through network communication unit (102); After the data channel allocation process, be ready for sending to D/A conversion unit (104);
Then; D/A conversion unit (104) receives after the digital quantity signal of master control borad unit (101); With digital quantity signal convert to scope for-10V to+10V voltage analog signal, the processing through filtration module (104b) obtains clean sine wave signal;
Power amplification unit (105) zooms into electric current, the voltage that meets the electric system standard with the small signal analog quantity that receives then, and sends to the merge cells of access;
The mutual inductor module (106b) of feedback loop switch unit (106) then, the big electric current that no-load voltage ratio as required will send, big voltage unification convert scope to and are-5V the voltage signal to+5V;
Send AD conversion unit (107) to through the later voltage signal of second-order filter then, will simulate the small-signal amount and convert digital quantity signal to, and prepare to send to WT master control borad unit (101);
After last WT master control borad unit high speed processor DSP obtains the digital quantity of digital quantity and upper layer software (applications) emulation of AD conversion unit (107); Calculate difference between the amount of actual amount that sends and emulation through Fourier; Go out the modified value of next time sending according to algorithm computation successively, give FPGA processor this modified value;
Corrective system drift and error
At first pass through the touch of LCD MODULE (103); The FPGA processor transmits control signal for loop switch unit (106); Inform that current device will get into system's drift and error correction state; The correction drift in the two closed loops of startup and the loop of error, all emulated data data and control signals that device shielding this moment emulation platform sends, and it is zero to make FPGA send to D/A conversion unit (104);
Pass through power amplification unit (105) then; Loop switch unit (106); AD conversion unit (107) collects master control borad unit (101) with the DC quantity that exists in the system, and this moment, high speed processor DSP calculated drift and the error that exists in the system; Write down this value, as normal conversion and the modified value of sending emulated data.
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| CN103713214A (en) * | 2013-12-24 | 2014-04-09 | 国家电网公司 | Intelligent transformer station relay protection closed loop test system |
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| CN102768314B (en) | 2014-09-24 |
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