CN201966860U - Synchronous generator simulation excitation system based on DSP - Google Patents
Synchronous generator simulation excitation system based on DSP Download PDFInfo
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- CN201966860U CN201966860U CN2010206578991U CN201020657899U CN201966860U CN 201966860 U CN201966860 U CN 201966860U CN 2010206578991 U CN2010206578991 U CN 2010206578991U CN 201020657899 U CN201020657899 U CN 201020657899U CN 201966860 U CN201966860 U CN 201966860U
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Abstract
The utility model discloses the synchronous generator simulation excitation system based on DSP, characterized in that the direct current side and the negative resistance ware of threephase commutate bridge all concatenate in the excitation return circuit of synchronous generator; DSP's PWM port meets through the trigger end of pulse driving circuit with the threephase commutate bridge; Synchronous generator terminal voltage signal, synchronous generator end current signal, exciting voltage signal, exciting current signal all insert DSP's AD input port, and the voltage synchronization signal connects DSP's CAP input. Should simulate excitation system sexual valence relative altitude, easily implement, and have very high practical value based on DSP's synchronous generator.
Description
Technical field
The utility model belongs to the Power System and its Automation technical field, relates to a kind of synchronous generator simulation excitation system based on DSP.
Background technology
Synchronous generator simulation excitation system is one of visual plant of Electrical Power System Dynamic simulation, be mainly used in the scientific research of scientific research institute and Electric Power Automation Equipment manufacturing enterprise, the research and development of electric power new technology and equipment and power product check and measurement, and the scientific research of institution of higher learning and experimental teaching.
Because economy and fail safe, the Test to Failure of electric power system does not generally carry out in the Electrical Power System Dynamic simulation laboratory in practical power systems.The former simulation excitation system of synchronous generator is one of visual plant of Electrical Power System Dynamic simulation, and large disturbance problem and electromechanical transient process in the research electric power system have the effect of can not ignore.The simulation Research on Excitation also lags behind excitation system at present, though the simulation excitation system product of digital control is arranged, but still exist following several problem:
(1) the control core adopts 196 single-chip microcomputers, compares professional peripheral hardware that data processing speed, precision, chip integration become etc. with motor special control chip TMS320F2812DSP and has a long way to go.
(2) man-machine interface is poor, adopts charactron and indicator light to come display parameters and state, and compare man-machine interface with the large-screen LCD display friendly inadequately.
What (3) adopt with the host computer communication system is the RS232 interface, and transmission speed is little, and distance is short, poor anti jamming capability.
(4) control mode of simulation generator is few, and the protection limitation function is perfect inadequately, does not simulate the many failure problems that occurred in the generator operation process, becomes broken string loss of excitation etc. such as generator broken string, excitation.
Therefore, be necessary existing simulation excitation system is carried out improvement and design.
The utility model content
Technical problem to be solved in the utility model is to propose a kind of synchronous generator simulation excitation system based on DSP, should based on synchronous generator simulation excitation system cost performance height of DSP, easy to implement, have a very high practical value.
Technical solution of the present utility model is as follows:
A kind of synchronous generator simulation excitation system based on DSP, the DC side of three-phase commutation bridge and dynatron all are concatenated in the energized circuit of synchronous generator; The PWM port of DSP joins by the trigger end of pulse driving circuit and three-phase commutation bridge;
Synchronous generator terminal voltage signal, synchronous generator end current signal, exciting voltage signal, exciting current signal all are linked into the AD input port of DSP, and the voltage synchronizing signal connects the CAP input of DSP.
DSP communicates to connect by serial communication interface and host computer.
DSP and LCD display are joined.
Three-phase commutation bridge is a three-phase full-controlled rectifier bridge, and the voltage synchronizing signal is the signal that the synchronous generator terminal voltage signal is exported behind zero-crossing comparator, is used for the floating voltage zero crossing.
Beneficial effect:
Synchronous generator simulation excitation system based on DSP of the present utility model serves as the control core with 32 high-speed dedicated dsp chip TM3202812, in dsp chip, can adopt immune algorithm that Control Parameter is optimized and adjust; And in the simulation excitation system, added the measuring power angle function.
Utilize the high-speed data disposal ability of DSP, do not increasing hardware, only utilize the certificate of sampling in real time, accurately, realized the accurate Calculation at merit angle, the control precision of synchronous generator simulation excitation system can significantly be provided.Native system adopts the RS-485 communication interface to communicate by letter with host computer, all improves a lot than existing RS-232 communication speed and distance; Adopt the large-screen LCD display,, better man-machine interface arranged than existing LED charactron and indicator light, and with chip microcontroller the serial parallel of DSP between shielding with LCD change, increased the reliability of transmitting.Make the user can carry out operations such as parameter adjustment intuitively.
Description of drawings
Fig. 1 is the major loop schematic diagram of synchronous generator simulation excitation system;
Fig. 2 is the overall circuit block diagram of synchronous generator simulation excitation system.
Embodiment
Below with reference to the drawings and specific embodiments the utility model is described in further details:
Embodiment 1:
As depicted in figs. 1 and 2, a kind of synchronous generator simulation excitation system based on DSP, the DC side of three-phase commutation bridge and dynatron all are concatenated in the energized circuit of synchronous generator; The PWM port of DSP joins by the trigger end of pulse driving circuit and three-phase commutation bridge; Synchronous generator terminal voltage signal, synchronous generator end current signal, exciting voltage signal, exciting current signal all are linked into the AD input port of DSP, and the voltage synchronizing signal connects the CAP input of DSP.DSP communicates to connect by serial communication interface and host computer.DSP and LCD display are joined.
Pulse driving circuit is existing common circuit.
Three-phase alternating-current supply is transformed to DC power supply through controlled rectifier, produces trigger impulse by control circuit and regulates direct voltage.
The design philosophy of the major loop of synchronous generator simulation excitation system is: field regulator is gathered desired signal from the simulation synchronous generator, the exciting current of simulation synchronous generator is promptly controlled in the output of control exciting power unit, dynatron is serially connected in the excitation winding loop, increases the excitation winding time constant.
This excitation system is to the design of 15KVA unit, and exciting current is 3.5A, and exciting voltage is 200V.
Machine excitation system power output part adopts the three-phase fully-controlled bridge rectification circuit.The three-phase thyristor bridge rectification circuit, its phase shift angle is the 15-150 degree, is connected to magnetism elimination circuit or adopts inversion field suppression.The fully controlled bridge inversion field suppression is from the anti-AC side of sending back to of DC side with magnetic field energy.Pilot angle is controlled by the phase shift trigger impulse.When trigger angle 0 when the pi/2, rectification circuit is in rectification state; When trigger angle greater than pi/2 less than π, rectification circuit is in inverter mode.
Digital excitation regulator comprises: power module, watchdog module, storage expanding module, signal acquisition module; synchronous frequency measurement module is with host computer communication module, keyboard input module; relaying protection and switching value output module, the LCD display module, PWM exports Isolation Amplifier Module.
The operation principle of system is: sampled signals such as the set end voltage of generator, machine end electric current, exciting voltage, exciting current, the isolation and the conversion of process signal convert the ADC module that 0～3V signal is sent into TMS320F2812 to.DSP carries out calculation process according to Control Parameter, working method, protection restrictive condition to sampled result, according to operation result control PWM trigger impulse angle, simultaneously information is given LCD and shows.Pwm signal is through the pulse amplification module, and the output back directly drives the silicon controlled trigger electrode, control exciting current size, thus regulate set end voltage.Simultaneously, the input and output of malfunction monitoring module real-time monitoring system.When monitoring fault when taking place,, allow DSP fast processing event of failure immediately with interrupt mode notice DSP.In addition, TMS320F2812 communicates by RS485 communication module and host computer, swap data.
The design of dsp system basic hardware
TMS320F2812 is the dsp chip that is specifically designed to motor and other motion control that TI company releases, integrated multiple advanced person's peripheral hardware on the device.Contemporary code instruction and F24x series digit signal processor are compatible fully, thereby but have guaranteed the continuity of project or product design.Compare with F24x series digit signal processor, F28lx series digit signal processor has improved the precision (32) of computing and the disposal ability (reaching 150MIPS) of system.This series digit signal processor is the also integrated Flash memory of 128KB, the boot ROM of 4KB, the OTPROM of mathematical operation table and 2KB, thus improved application flexibility greatly.128 cryptoguard mechanism has been protected the intellectual property of product effectively.Two event manager modules provide good controlled function for motor and Power Conversion control.12 ADC unit of 16 passage high-performance provide two sampling hold circuits, can realize the double-channel signal synchronized sampling.
The I/O operating voltage of TMS320F2812 is 3.3V, and therefore, its I/O level also is the 3.3V logic level.When the design dsp system, except dsp chip, must design the interface of dsp chip and other peripheral chips, if the operating voltage of peripheral chip also is 3.3V, so just can directly connect.It is the peripheral chip of 3.3V that this control system adopts operating voltage as far as possible, so that circuit reduction.
The watchdog chip that this digital signal processing system adopts is X5163, the CPU monitor of band SPI interface 16Kb E2PROM.The monitoring of WatchDog Timer, operating voltage and three kinds of function combinations of E2PROM in an encapsulation, and adopt the Serial Peripheral Interface (SPI) (SPI) and the software protocol of three-way bus work, reduced system cost, improved the functional reliability of system, needing to be very suitable for the on-the-spot occasion of revising data, can be widely used in fields such as instrument and meter, industry automatic control.In application, the read-write of storage array, the setting of WatchDog Timer are then needed to finish by the instruction that chip requires.
The Serial Peripheral Interface (SPI) (SPI) of the serial input/output port of X5163 and TMS320F2812 joins, adopt the input of SPI clock, the GPIOB3 of DSP (PWM10) selects control pin as sheet, the reset signal output pin connects the resetting pin of DSP, when program fleet or deadlock state, X5163 sends low level, allows DSP reset, system restart.When program is moved for the first time, initialization X5163, the GPIOB3 of DSP (PWM10) pin is put low, chooses X5163, and under the SPICLK sequential cooperated, control command and data write X5163 by SI.WatchDog Timer is set, and the data that will need simultaneously to preserve write the X5163 preservation.When program was moved once more, data were read in DSP from the SO mouth, had finished the preservation to data like this.When the timing value that is provided with then, program is if can not reset, then the RST of X5163 sends low level, TMS320F2812 is resetted, system restart.
DSP and upper machine communication circuit
For excitation controlling device, mainly need the function that realizes as follows with the PC communication:
(1) with the various operational factors of excitation unit, uploads PC, utilize the abundant software and hardware resources of PC, realize the demonstration of image;
(2) by the application software on the PC, various operational factors are made amendment, be sent in the excitation controlling device then.If do not need real-time image data, the real-time of excitation controlling device pair and PC communication requires not high, and data quantity transmitted also and little.
The design of dynatron case
What the excitation winding of generator can be regarded as inductance L and resistance R connects its time constant
In the Electrical Power System Dynamic simulation laboratory, the simulation unit manufactures and designs by the physical similarity principle.And unit set inertia time constant H wherein
jSimulation simulation synchronous motor group rotor structure is restricted, the time constant of its excitation winding less than the time constant of the excitation winding of electric power system mesarcs generator, particularly satisfies large-size machine H mostly
jWith rotor winding resistance r
fSimulation require to be mutual contradiction.When requiring H
jMore hour, the simulation of rotor winding resistance is difficulty more, (synchronous compensator for example, its H
jSpecial little).Guaranteeing under the similar situation of other electric parameter the general big several times that require than prototype machine always of molded motor rotor resistance.In order to guarantee to simulate the unit requirement similar, must the resistance of its energized circuit be compensated with the prototype unit parameter.The excitation winding time constant T of universal model motor
DoBe approximately about 2 seconds, and the T of Generator Set
DoIt is 5～13 seconds.In the dynamic simulation experiment chamber of electric power system, must be connected in series negative resistance increases time constant.
Before the compensation of dynatron time constant, should at first adjust through zeroing and negative resistance, could guarantee to obtain required negative resistance charactertistic then.Dynatron works in that " zeroing ", " adjust " with " compensation " during the position, should be opened the working power switch.
Adjusting zero method
Regulate " zeroing " potentiometer, measure dynatron both end voltage (voltage between RIRO), making voltage is zero getting final product.After general the mixing up for the first time, do not need to carry out to adjust next time.
Setting method
External experiment power supply note both positive and negative polarity insert+,-jack, " mode switch " puts " adjusting " position, the voltage that adjusting adds experiment power supply increases gradually by zero, read dynatron both end voltage and the electric current that flows through dynatron, and calculate negative electricity resistance (dynatron both end voltage remove electric current), regulate the negative resistance potentiometer of " adjusting " and make ratio equal required numerical value to get final product.In the present embodiment, external experiment power supply capacity is 30V/3A, and the numerical value of the dynatron both end voltage when the electric current that flows through dynatron equals 1A equals the resistance of negative resistance, and dynatron is adjusted and finished.
Claims (3)
1. the synchronous generator simulation excitation system based on DSP is characterized in that the DC side of three-phase commutation bridge and dynatron all are concatenated in the energized circuit of synchronous generator; The PWM port of DSP joins by the trigger end of pulse driving circuit and three-phase commutation bridge;
Synchronous generator terminal voltage signal, synchronous generator end current signal, exciting voltage signal, exciting current signal all are linked into the AD input port of DSP, and the voltage synchronizing signal connects the CAP input of DSP.
2. the synchronous generator simulation excitation system based on DSP according to claim 1 is characterized in that DSP communicates to connect by serial communication interface and host computer.
3. the synchronous generator simulation excitation system based on DSP according to claim 1 and 2 is characterized in that DSP and LCD display are joined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206578991U CN201966860U (en) | 2010-12-13 | 2010-12-13 | Synchronous generator simulation excitation system based on DSP |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206578991U CN201966860U (en) | 2010-12-13 | 2010-12-13 | Synchronous generator simulation excitation system based on DSP |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197565A (en) * | 2013-03-21 | 2013-07-10 | 北京工业大学 | Motor imitator multi-source signal processing system capable of networking and extending |
| CN104579041A (en) * | 2015-01-23 | 2015-04-29 | 中国核工业电机运行技术开发有限公司 | Control board used for excitation control over synchronous motor |
| CN104834213A (en) * | 2014-02-12 | 2015-08-12 | 国家电网公司 | Excitation interference control system |
| CN105262390A (en) * | 2015-11-26 | 2016-01-20 | 国家电网公司 | Negative resistance device |
| CN109560732A (en) * | 2017-09-25 | 2019-04-02 | 西安科技大学 | A kind of Excitation Controller for Synchronous Generator based on DSP |
-
2010
- 2010-12-13 CN CN2010206578991U patent/CN201966860U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197565A (en) * | 2013-03-21 | 2013-07-10 | 北京工业大学 | Motor imitator multi-source signal processing system capable of networking and extending |
| CN104834213A (en) * | 2014-02-12 | 2015-08-12 | 国家电网公司 | Excitation interference control system |
| CN104834213B (en) * | 2014-02-12 | 2017-11-17 | 国家电网公司 | A kind of Excitation interference control system |
| CN104579041A (en) * | 2015-01-23 | 2015-04-29 | 中国核工业电机运行技术开发有限公司 | Control board used for excitation control over synchronous motor |
| CN105262390A (en) * | 2015-11-26 | 2016-01-20 | 国家电网公司 | Negative resistance device |
| CN109560732A (en) * | 2017-09-25 | 2019-04-02 | 西安科技大学 | A kind of Excitation Controller for Synchronous Generator based on DSP |
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Granted publication date: 20110907 Termination date: 20121213 |