CN102223128B - Digital excitation control system based on 32-bit floating-point type processor and working method - Google Patents
Digital excitation control system based on 32-bit floating-point type processor and working method Download PDFInfo
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Abstract
The invention relates to a digital excitation control system based on a 32-bit floating-point type processor and a working method. The digital excitation control system mainly comprises a DSP (digital signal processor) processor module, a switch quantity input module, a level conversion module, a switch quantity output module, an analogue quantity adapting module, a frequency measuring module, an alternating-current sampling module, a data storage module, an excitation current adapting module, a data receiving and emitting module and an intelligent displaying unit module. In the invention, the high-performance 32-bit floating-point type processor is used as a main CPU chip; and a touchable tablet computer with excellent performance is connected with a main control unit by a dual-high-speed CAN (controller area network) network to form an intelligent displaying system. The advanced alternating-current sampling algorithm is combined with the excellent performance of the DSP so as to realize the deep digitalization of the excitation controller, thus really realizing standardization on data processing; and on data transmission, the high-speed and stable transmission of the data is realized by the dual-high-speed CAN network, thus improving the whole performance index of the excitation control system.
Description
Technical field:
The present invention relates to electric power system synchronous generator exciting controller data acquisition technique field, particularly a kind of Digital Excitation Control System and method of work based on 32 floating type processors.
Background technology:
Excitation system is the important component part of generator system, and its topmost effect is to keep the normal operation of generator and power system stability operation.The microcomputer excitation epoch have been entered already to today, the adjuster of releasing on the domestic market is generally all take 16,32 single-chip microcomputers as primary processor, generally use binary channels or multi-channel structure at hardware configuration, by adjuster cabinet and power demagnetization cabinet and excitation transformer excitation control system.In order to satisfy the needs of power system stability operation, except needs increase more protection and limitation function in exciter control system, also need more advanced persons' excitation control theory and algorithm application in excitation controlling device.This development trend is to main control unit, man-machine interface, the power cell of exciter control system, and the data transmission between each unit has all proposed very high requirement.And at present no matter be digital excitation control system take 16 single-chip microcomputers as core, or the excitation controller take 32 (fixed point type) processors as core, all there is shortcoming and defect more or less in it on the ability of data operation and processing, for property indices and the operational factor precision that improves exciter control system, research just becomes the development need of synchronous generator excited system as the digital excitation control system of core take 32 novel floating type dsp chips.
Central processing unit DSPf28335 is the dsp chip of the up-to-date release of TI company, is 32 most advanced on the present international market, that function is the most powerful float-point DSP.It and have digital signal processing capability, have again powerful incident management ability and embedded Control function, be specially adapted to the observing and controlling occasion that data in enormous quantities are processed, such as industrial automatic control, power electronic technology application, smart instrumentation and motor, motor servo-control system etc.
Chinese patent CN200510122302.7 discloses a kind of data Collection ﹠ Processing System of the digital excitation controller based on DSP; It is the excitation system take f2812 as core, insufficient section is in data acquisition system, although selected sampling A/D chip precision is higher, processor also is 32, can be owing to processor itself is fixed point type processor, therefore in the calculating process of reality, can increase the error of calculation, thereby and then increase control precision and the response that systematic error can affect whole system; In addition, in the power rectification loop, it is how to produce that the required trigger impulse of controllable silicon does not have clear and definite explanation, in excitation system, owing to reasons such as electromagnetic interference, a very important link is exactly how pulse produces and send on the rectifier bridge, if long transmission distance, then pulse signal is easy to disturbed.
Summary of the invention
The object of the present invention is to provide a kind of Digital Excitation Control System based on 32 floating type processors and method of work, can overcome the defective of prior art.The present invention selects high performance 32 floating type processors as the host CPU chip in the main control unit module, connects to form data sampling, calculating and the treatment system of excitation controller by rational hardware circuit design and high-precision AC sampling chip; Select the tangible panel computer of excellent performance to be connected the intelligent display system of construction system with main control unit by two high-speed CAN networks.The present invention is aspect signal sampling, by selecting suitable A/D sampling A/D chip, advanced person's AC sampling algorithm and the excellent properties of DSP self are perfectly combined, realize the degree of depth digitlization of excitation controller, on data are processed, really realized standardization, aspect the data transmission, by two high-speed CAN networks, realized the high speed of data, stable delivery, and then improved the overall performance index of exciter control system.
A kind of Digital Excitation Control System based on 32 floating type processors provided by the invention mainly comprises:
Analog quantity sampling unit: be used for the collection to signals such as generator unit stator voltage, stator current, exciting currents;
Switching value input and output unit: be used for finishing collection and output to system switching amount signal;
CPU main control unit: be used for finishing conversion and logical operation to all data, calculate at that time required SCR Trigger Angle degree under the operating mode, finish the warning of major failure signal and processing etc.;
Display unit: be used for finishing key data and various operating state signal, alarm signal demonstration.
Principal character of the present invention comprises:
Dsp processor module, switching input module, the first level switch module, second electrical level modular converter, switching value output module, analog quantity adaptation module, frequency measurement module, AC sampling module, data memory module, exciting current adaptation module, the first data transmit-receive module, the second data transmit-receive module and intelligent display unit module.
The output of said switching input module connects the input of the first level switch module, and the output of the first level switch module connects the I/O input of dsp processor module;
The input of said second electrical level modular converter is connected with the I/O output of dsp processor module, the input of the output connecting valve amount output module of second electrical level modular converter;
Said analog quantity adaptation module output connects the input of AC sampling module, for AC sampling module, its data output end is connected to the data/address bus input (data/address bus) of dsp processor module, and the logic output terminal of the control AC sampling of dsp processor module connects the control bus input of AC sampling module; Simultaneously, at the output of analog quantity adaptation module, wherein the output of one tunnel stator voltage signal is connected to the input of frequency measurement module; The output of frequency measurement module connects the seizure input of dsp processor module; The SPI output of dsp processor module is connected with the input of data memory module; The input of exciting current adaptation module is connected with the exciting current output of intelligent power cabinet unit, and the output of exciting current adaptation module is connected with the input of the inside A/D (direct current sampling) of dsp processor module; The CAN1 communication output of dsp processor module is connected with the input of the first data transmit-receive module is two-way, and the output of the first data transmit-receive module is connected with the intelligent power unit with intelligent display unit respectively that input is two-way to be connected; The CAN2 communication output of dsp processor module is connected with the input of the second data transmit-receive module is two-way, and the output of the second data transmit-receive module is connected with the intelligent power unit with intelligent display unit respectively that input is two-way to be connected.
For switching input module: in the existing technology, this partial circuit generally only is comprised of the optically coupled isolation circuit of routine, the said switching input module of the present invention is by low-pass filter circuit, optically coupled isolation circuit, diode display circuit and logical transition the electric circuit constitute, after its first order circuit carries out low-pass filtering to 24V switching value signal, by the second level optically coupled isolation circuit signal is converted to 5V and by diode displaying, is delivered to the input of the first level switch module after the logical transition circuit negate by the third level again by 24V;
Above-mentioned said the first level switch module is take level transferring chip as main, cooperates corresponding interface circuit to consist of, and the 5V switching value signal that collects is converted to the I/O input that inputs to the dsp processor module behind the 3.3V;
Above-mentioned said second electrical level modular converter is take level transferring chip as main, cooperates corresponding interface circuit to consist of, and will be converted to from the 3.3V switching value signal that dsp processor module I/O output receives the input that inputs to switching value output module behind the 5V;
Above-mentioned said switching value output module is comprised of two-level logic change-over circuit, optically coupled isolation circuit and diode display circuit, with the 5V switching value signal that receives through twice logical transition, be converted to the 24V signal by optically coupled isolation circuit, and by diode displaying out, transfer out at last;
Above-mentioned said analog quantity adaptation module is comprised of the analog quantity pre-process circuit, the analog input signal comprises synchronous generator stator voltage and two kinds of baseband signals of stator current, discharge circuit by routine forms, by adapter circuit with the threephase stator voltage signal, threephase stator current signal (stator current signal need be converted to voltage signal through behind the electric resistance partial pressure) is adjusted to and satisfies the required voltage range of AC sampling module input, deliver to the input of AC sampling module, to finish simultaneously the phase in the adaptive stator voltage three-phase, be delivered to the input of frequency measurement module;
Above-mentioned said frequency measurement module is comprised of than output circuit, output violent change protective circuit filter circuit, input saturation circuit, voltage ratio, with single-phase stator voltage signal, the square-wave signal that is converted to 5V exports the seizure pin input end of dsp processor module to by these circuit;
The interface circuit of above-mentioned said AC sampling module and dsp processor module is comprised of analog to digital converter (AC sampling chip) and digital signal processor and relevant interface device, DSP finishes control by the logic control signal of control bus to analog to digital converter, after the analog signal input AC sampling A/D chip after the analog module processing, directly be converted to the digital signal that can satisfy the requirement of DSP input terminal voltage and input the data input pin of dsp chip by data/address bus, then process the control parameter that obtains being correlated with according to the designed AC sampling algorithm of software;
Above-mentioned said data memory module is comprised of outside extended menory, DSP by SPI with extend out ferroelectric memory and be connected, can in system's running, can realize the communication that high speed is simple and direct, can preserve at any time the switching value information and the time tag that gather in the course of work, finish the reading and writing of data, and support power down to preserve.
Above-mentioned said exciting current adaptation module mainly is comprised of the exciting current adapter circuit, after it will become voltage signal by electric resistance partial pressure from the exciting current signal that the intelligent power cabinet unit collects, again by rational amplifier adapter circuit, the exciting current signal is treated to satisfies dsp processor inside modules A/D and input desired voltage signal, flow to the dsp processor unit, finish excitation controller to the sampling of system's exciting current signal.
Above-mentioned said data transmit-receive module (comprising the first data transmit-receive module and the second data transmit-receive module) mainly is comprised of the CAN communicating circuit, this partial circuit mainly comprises optically coupled isolation circuit, CAN transmission circuit and relevant adapter circuit, realize the light isolation of CAN communication signal, digital received and sent work.The input of the first data transmit-receive module and the second data transmit-receive module is connected to form two CAN net redundant networks with the CAN1 communication port of dsp processor module and CAN2 communication port respectively, the output of data transmit-receive module is connected with the communication input port of intelligent display module and intelligent power cabinet unit, consists of the two CAN Netcom of the said redundant high-speed of the present invention news network.Wherein each node of communication network has the network self-checking function, when network breaks down, can realize the automatic switchover of operational network and backup network, and then has guaranteed safety and the stability of excitation system operation.
The method of work of a kind of Digital Excitation Control System based on 32 floating type processors provided by the invention comprises the steps:
1) by analog quantity adaptation module, AC sampling module, can realize the sampling work of generator threephase stator voltage, threephase stator electric current, generator outlet frequency signal, can finish sampling to system's exciting current by the exciting current adaptation module, after all sampled signals enter the dsp processor unit, can be calculated the voltage effective value, current effective value, active power, reactive power of generator system and every data in current excitation system power loop through software;
2) by switching input module and the first level switch module; excitation controller can be finished the collection to system switching amount signal, and then can detect state (stopped status, trystate, no-load running state or and guipure carry state), operational mode (constant-pressure operation, constant current operation or other working method) and other the switching value information of current generator system.
3) the central data processing module is identified, is judged and process the switching value signal that collects and the every data that calculate; and according to the running status of current generator system; after PID calculating and various protection limiting program check correction, can draw the control angle α (15 °-150 °) of the required phase-shift pulse in intelligent power loop.
4) last dsp processor unit sends to the intelligent power cabinet unit by fieldbus, and power cell can produce trigger impulse and then finish triggering to thyristor in the rectifier bridge, the output exciting current according to control angle.Simultaneously, by fieldbus various data and quantity of state are sent to intelligent display unit, the demonstration of the various variablees of completion system and figure.
The calculating of the signal described in the above-mentioned steps realizes with the software of excitation control law: at first, task manager by DSP passes through catching the processing of square-wave signal on the pin, can draw the electric voltage frequency of generator outlet, but the AC sampling by software phase-lock loop and AC sampling subprogram completion system analog quantity again; Can obtain voltage effective value, current effective value, active power, the reactive power of generator system by counting subroutine.Then can calculate the exciting current of system by the inner A/D converter of DSP.Can directly calculate the required current pilot angle α of control impuls by CPU according to the main logic of excitation system and various protection/limitation function subprogram; then send/accept subprogram by data pilot angle is sent to the intelligent power cabinet unit; finish forming of trigger impulse by it; the control rectifier bridge is finished the control to exciting current.
In sum as can be known, excitation controller can pass through collection and the calculating to various signals, can by control output α size, control the change of excitation system exciting current, thereby reach the purpose of automatic regulator generator voltage and load or burden without work.
The present invention's advantage compared with prior art and the good effect of generation:
The present invention has overcome the defective of prior art.Conditioner unit sends to power cell with pilot angle α via the CAN bus with main control unit, after the intelligent power unit receives α, self produces trigger impulse, directly supply with rectifier bridge, so both can avoid electromagnetic interference, can improve pulse precision again, under the prerequisite that guarantees system safety stable operation, also improve the precision of excitation system; In the excitation system of the present invention, selected on main control unit is 32 floating type processors, what adopt on system configuration is many CPU dcs, select the characteristics such as two CAN net heat redundancies in communication, all be better than like this prior art in the industry at aspects such as sampling precision, data processing, arithmetic speed, data transmission, figure demonstration and electromagnetic compatibilities.In a word, owing to having used the floating type processor, reduced the error of calculation in the data processing, realized more accurately standardization, simplified the data operation process, thereby reduced the burden of core processor, made the master control system operation become safer, stable.By the high-speed field bus network excitation controller is connected with the intelligent power cabinet unit, has solved to a great extent in the excitation control system adjuster and be connected with power cabinet and be subjected to the far and near restriction of on-the-spot distance, increased the practicality of excitation control system; Excitation regulation main control unit simultaneously, intelligent display unit, and and the intelligent power cabinet unit between by at a high speed two CAN network connections, greatly strengthened the Electro Magnetic Compatibility of excitation system.Communication system adopts the dual network Redundancy Design, and each node has the network self-checking function, when network breaks down, can automatically switch, and has guaranteed the security and stability of excitation system operation, and then generator system can be safely and steadily run more.
Description of drawings
Fig. 1 is general structure schematic diagram of the present invention.
Fig. 2 is switching input module circuit diagram of the present invention.
Fig. 3 is switching value output module circuit diagram of the present invention.
Fig. 4 is frequency measurement modular circuit schematic diagram of the present invention.
Fig. 5 is exciting current adaptation module circuit diagram of the present invention.
Fig. 6 is data transmit-receive module circuit diagram of the present invention.
Fig. 7 is that the present invention is to the software flow pattern of exciting current control.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiment (accompanying drawing), but they not restriction the present invention.
As shown in Figure 1, a kind of Digital Excitation Control System based on 32 floating type processors comprises: dsp processor module, switching input module, the first level switch module 1, second electrical level modular converter 1, switching value output module, analog quantity adaptation module, frequency measurement module, AC sampling module, data memory module, exciting current adaptation module, the first data transmit-receive module 1, the second data transmit-receive module 2 and intelligent display unit module form.The output of said switching input module connects the input of level switch module 1, and the output of the first level switch module 1 connects the I/O input of dsp processor module; The input of said second electrical level modular converter 1 is connected with the I/O output of dsp processor module, the input of the output connecting valve amount output module of second electrical level modular converter 1; Said analog quantity adaptation module output connects the input of AC sampling module, for AC sampling module, its data output end is connected to the data/address bus input of dsp processor module, and the logic output terminal of the control AC sampling of dsp processor module connects the control bus input of AC sampling module; Simultaneously, at the output of analog quantity adaptation module, wherein the output of one tunnel stator voltage signal is connected to the input of frequency measurement module; The output of frequency measurement module connects the seizure input of dsp processor module; The SPI output of dsp processor module is connected with the input of data memory module; The input of exciting current adaptation module is connected with the exciting current output of intelligent power cabinet unit, and the output of exciting current adaptation module is connected with the input of the inside A/D (direct current sampling) of dsp processor module; The CAN1 communication output of dsp processor module is connected with the input of the first data transmit-receive module 1 is two-way, and the output of the first data transmit-receive module 1 is connected with the intelligent power unit with intelligent display unit respectively that input is two-way to be connected; The CAN2 communication output of dsp processor module is connected with the input of the second data transmit-receive module 2 is two-way, and the output of the second data transmit-receive module 2 is connected with the intelligent power unit with intelligent display unit respectively that input is two-way to be connected.
As shown in Figure 2, above-mentioned said switching input module is by low-pass filter circuit, optically coupled isolation circuit, diode display circuit and logical transition the electric circuit constitute, after its first order circuit carries out low-pass filtering to 24V switching value signal, by the second level optically coupled isolation circuit signal is converted to 5V and by diode displaying, is delivered to the input of the first level switch module 1 after the logical transition circuit negate by the third level again by 24V;
The SN74LVC4245 chip that above-mentioned said the first level switch module 1 is produced take Texas Instruments is as main, consist of in conjunction with conventional hardware interface circuit, the 5V switching value signal that collects is converted to the I/O input that inputs to the dsp processor module behind the 3.3V;
The SN74LVC4245 chip that above-mentioned said second electrical level modular converter 1 is produced take Texas Instruments is as main, consist of in conjunction with conventional hardware interface circuit, will be converted to from the 3.3V switching value signal that dsp processor module I/O output receives the input that inputs to switching value output module behind the 5V;
As shown in Figure 3, above-mentioned said switching value output module is comprised of two-level logic change-over circuit, optically coupled isolation circuit and diode display circuit, with the 5V switching value signal that receives through twice logical transition, be converted to the 24V signal by optically coupled isolation circuit, and by diode displaying out, transfer out at last;
Above-mentioned said analog quantity adaptation module is comprised of the analog quantity pre-process circuit, the analog input signal comprises synchronous generator stator voltage and two kinds of baseband signals of stator current, discharge circuit by routine forms, by adapter circuit with the threephase stator voltage signal, threephase stator current signal (stator current signal need be converted to voltage signal through behind the electric resistance partial pressure) is adjusted to and satisfies the required voltage range of AC sampling module input, deliver to the input of AC sampling module, to finish simultaneously the phase in the adaptive stator voltage three-phase, be delivered to the input of frequency measurement module;
As shown in Figure 4, above-mentioned said frequency measurement module is comprised of than output circuit, output violent change protective circuit filter circuit, input saturation circuit, voltage ratio, with single-phase stator voltage signal, the square-wave signal that is converted to 5V exports the seizure pin input end of dsp processor module to by these circuit;
Above-mentioned said dsp processor module with the TMS320f2833532 position floating type dsp chip of the up-to-date release of Texas Instrument (TI) as central processing unit of the present invention, AC sampling module is produced 14 with MAXIM company, 8 passages, synchronized sampling ADC conversion chip MAX1324 is main, by the alternating current sampling circuit of corresponding hardware interface circuit MAX1324 and DSPf28335 construction system.DSP finishes control by the logic control signal of control bus to MAX1324, after the analog signal input AC sampling A/D chip after the analog module processing, directly be converted to the digital signal that can satisfy the requirement of DSP input terminal voltage and input the data input pin of dsp chip by data/address bus, then process the control parameter that obtains being correlated with according to the designed AC sampling algorithm of software;
Above-mentioned said data memory module is comprised of outside extended menory, the FM25L256 chip that outer extension memory selects Ramtron company to produce, DSP by SPI with extend out ferroelectric memory and be connected, can in system's running, can realize the communication that high speed is simple and direct, can preserve at any time the switching value information and the time tag that gather in the course of work, finish the reading and writing of data, and support power down to preserve.
As shown in Figure 5, above-mentioned said exciting current adaptation module mainly is comprised of the exciting current adapter circuit, after it will become voltage signal by electric resistance partial pressure from the exciting current signal that the intelligent power cabinet unit collects, again by rational amplifier adapter circuit, the exciting current signal is treated to satisfies dsp processor inside modules A/D and input desired voltage signal, flow to the dsp processor unit, finish excitation controller to the sampling of system's exciting current signal.
As shown in Figure 6, above-mentioned said data transmit-receive module (comprising the first data transmit-receive module 1 and the second data transmit-receive module 2) mainly is comprised of the CAN communicating circuit, what provide is the circuit structure diagram of the first data transmit-receive module 1 herein, the second data transmit-receive module 2 principles are identical with the first data transmit-receive module 1, no longer repeat), this partial circuit mainly comprises optically coupled isolation circuit, CAN transmission circuit and relevant adapter circuit, realize the light isolation of CAN communication signal, digital received and sent work.Wherein the CAN transceiver is selected SN65HVD1050DR (VP1050) chip that Texas Instrument produces, the input of the first data transmit-receive module 1 and the second data transmit-receive module 2 is connected to form two CAN net redundant networks with the CAN1 communication port of dsp processor module and CAN2 communication port respectively, the output of data transmit-receive module is connected with the communication input port of intelligent display module and intelligent power cabinet unit, consists of the two CAN Netcom of the said redundant high-speed of the present invention news network.Wherein each node of communication network has the network self-checking function, when network breaks down, can realize the automatic switchover of operational network and backup network, and then has guaranteed safety and the stability of excitation system operation.
Method of work based on the Digital Excitation Control System of 32 floating type processors comprises the steps: in detail
1) by analog quantity adaptation module, AC sampling module, can realize the sampling work of generator threephase stator voltage, threephase stator electric current, generator outlet frequency signal, can finish sampling to system's exciting current by the exciting current adaptation module, after all sampled signals enter the dsp processor unit, can be calculated the voltage effective value, current effective value, active power, reactive power of generator system and every data in current excitation system power loop through software;
The collection of the signal described in this step is through being: for generator threephase stator voltage U g by voltage transformer (excitation PT, its no-load voltage ratio is */100V) with the Ug step-down; For generator threephase stator electric current I g, by current transformer (excitation CT, its no-load voltage ratio is */5A) electric current is diminished, then stator voltage, stator current signal after will processing are delivered to the analog quantity adaptation module, through adaptive, the stator voltage signal is converted to satisfy the voltage signal of AC sampling module and frequency measurement module input, stator current signal is converted to satisfy the voltage signal of AC sampling module input.In the adaptive rear threephase stator voltage one is delivered to mutually the input of frequency measurement module, behind frequency measurement circuit, become the seizure pin input end that square-wave signal is delivered to DSP.To deliver to through the voltage signal that satisfies AC sampling module after adaptive the input of AC sampling module, and by the analog to digital converter of AC sampling module analog quantity will be converted to digital quantity and deliver at last the DSP data input pin by data/address bus.
2) by switching input module and the first level switch module 1; excitation controller can be finished the collection to system switching amount signal, and then can detect state (stopped status, trystate, no-load running state or and guipure carry state), operational mode (constant-pressure operation, constant current operation or other working method) and other the switching value information of current generator system.
3) the central data processing module is identified, is judged and process the switching value signal that collects and the every data that calculate; and according to the running status of current generator system; after PID calculating and various protection limiting program check correction, can draw the control angle α (15 °-150 °) of the required phase-shift pulse in intelligent power loop.
4) last dsp processor unit sends to the intelligent power cabinet unit by fieldbus, and power cell can produce trigger impulse and then finish triggering to thyristor in the rectifier bridge, the output exciting current according to control angle.Simultaneously, by fieldbus various data and quantity of state are sent to intelligent display unit, the demonstration of the various variablees of completion system and figure.
In sum as can be known, this excitation controller can pass through collection and the calculating to various signals, can by control output α size, control the change of excitation system exciting current, thereby reach the purpose of automatic regulator generator voltage and load or burden without work.
The hardware completing steps is described below in the above-mentioned steps:
The collection of the signal step 1) is through being: for generator threephase stator voltage U g by voltage transformer (excitation PT, its no-load voltage ratio is */100V) with the Ug step-down; For generator threephase stator electric current I g, by current transformer (excitation CT, its no-load voltage ratio is */5A) electric current is diminished, then stator voltage, stator current signal after will processing are delivered to the analog quantity adaptation module, through adaptive, the stator voltage signal is converted to satisfy the voltage signal of AC sampling module and frequency measurement module input, stator current signal is converted to satisfy the voltage signal of AC sampling module input.In the adaptive rear threephase stator voltage one is delivered to mutually the input of frequency measurement module, behind frequency measurement circuit, become the seizure pin input end that square-wave signal is delivered to DSP.To deliver to through the voltage signal that satisfies AC sampling module after adaptive the input of AC sampling module, and by the analog to digital converter of AC sampling module analog quantity will be converted to digital quantity and deliver at last the DSP data input pin by data/address bus.
The calculating of the signal described in the above-mentioned steps realizes with the software of excitation control law: at first, by to catching the processing of square-wave signal on the pin, can draw the electric voltage frequency of generator outlet by the task manager of DSP.But obtained frequency and can by the AC sampling of software phase-lock loop and AC sampling subprogram completion system analog quantity, can obtain voltage effective value, current effective value, active power, the reactive power of generator system by counting subroutine.Then can calculate the exciting current of system by the inner A/D converter of DSP.Can directly calculate the required current pilot angle α of control impuls by CPU according to the main logic of excitation system and various protection/limitation function subprogram; then send/accept subprogram by data pilot angle is sent to the intelligent power cabinet unit; finish forming of trigger impulse by it; the control rectifier bridge is finished the control to exciting current.
The software routines that comprises of the present invention is:
AC sampling subprogram: the AC sampling of finishing analog quantity;
Switching value input subroutine: finish the input control to the system switching amount;
Switching value output subroutine: finish the output control to the system switching amount;
Software phase-lock loop subprogram: guarantee that the signal in each sampling period is within the same cycle;
Analog quantity counting subroutine: calculate generator terminal voltage, stator current, meritorious/idle, exciting current, exciting voltage;
The PID counting subroutine: calculate current rectifier bridge trigger angle α, and the various quantity of states of system;
Data sending/receiving subprogram: finish and other intelligent object between the data input and data output task;
The read/write subprogram of outer extension memory: finish the storage of some main fixed variables of excitation system;
Mark the one subprogram: the mark one of finishing every data calculates;
The main logic of excitation system and various defencive function subprogram: finish the logic of excitation system is judged and various protection and limitation function;
Auxiliary generator is finished the test subprogram (only use, no longer describe in detail) of type approval test when generator carries out type approval test.
As shown in Figure 7, the software flow to exciting current control of the present invention is as follows:
(1) system power-on reset;
(2) system program initialization: according to initialize routine, the every state of initialization system and each control register;
(3) close interruption: forbid all interruptions;
(4) initialization PIE interrupt vector table: program begins the interrupt vector of the system of reorientating, and makes it point to the interruption subroutine of user oneself definition;
(5) open interruption; Enable all interruptions;
(6) system enters main circulating program, waits for interrupting, and then enters next step user-defined system subroutine such as interrupt response, as interrupting without response, then continues to wait for;
(7) enter system subroutine after, program is divided into three branches to be moved respectively, respectively executing data storage program, switching value input program and analog quantity handling procedure;
In this step, can be divided into following steps again for the analog quantity handling procedure:
1. carry out the frequency measurement program: finish the frequency measurement to the synchronous generator port of export;
2. can realize soft phase-locked loop according to measured system frequency, and then finish the AC sampling program;
3. according in the outer extension memory to the initial setting of some analog quantitys, finish the calculating to the system core analog quantity, and the analog quantity of needs deposited in the outer extension memory;
(8) executing data mark the one program is finished the standardization of main analog quantity;
(9) system running state and operational mode are confirmed in the switching value completion system identification of switch amount input program processing, finish PID and calculate, and obtain the control angle α of the current needs of system; Confirm simultaneously the various running statuses of system;
After executing previous step, system program divides two branch's operations:
(10) for through after the PID computing, reaffirm that the system mode assignment is to corresponding switching value;
(11) simultaneously, the execute protection limiting program is tested and is proofreaied and correct the pilot angle α that calculates;
(12) executing data receives the transmission program, and last pilot angle α and switching value are sent by fieldbus other node to system.
The Digital Excitation Control System that to the present invention is based on 32 floating type DSP be core is with (32 of the high performance DSP TMS320f28335 of the up-to-date release of TI company, the floating type processor) is central processing unit, with the A/D modular converter of MAX1324 chip as the system core signal, realize data transmission between main control units and intelligent display unit, the intelligent power cabinet unit by two high-speed CAN networks.Main control unit DSC and intelligent display unit consist of excitation controller system described in the invention, at last by to intelligent power cabinet transmitted pilot angle α, finish control to generator with the intelligent power cabinet unit.
Claims (10)
1. Digital Excitation Control System based on 32 floating type processors comprises:
Analog quantity sampling unit: be used for the collection to generator unit stator voltage, stator current, exciting current signal;
Switching value input and output unit: be used for finishing collection and output to system switching amount signal;
CPU main control unit: be used for finishing conversion and logical operation to all data, calculate at that time required SCR Trigger Angle degree under the operating mode, finish warning and processing to the major failure signal;
Display unit: be used for finishing key data and various operating state signal, alarm signal demonstration;
It is characterized in that it mainly comprises:
Dsp processor module, switching input module, the first level switch module, second electrical level modular converter, switching value output module, analog quantity adaptation module, frequency measurement module, AC sampling module, data memory module, exciting current adaptation module, the first data transmit-receive module, the second data transmit-receive module and intelligent display unit module;
The output of said switching input module connects the input of the first level switch module, and the output of the first level switch module connects the I/O input of dsp processor module;
The input of said second electrical level modular converter is connected with the I/O output of dsp processor module, the input of the output connecting valve amount output module of second electrical level modular converter;
Said analog quantity adaptation module output connects the input of AC sampling module, for AC sampling module, its data output end is connected to the data/address bus input of dsp processor module, and the logic output terminal of the control AC sampling of dsp processor module connects the control bus input of AC sampling module; Simultaneously, at the output of analog quantity adaptation module, wherein the output of one tunnel stator voltage signal is connected to the input of frequency measurement module; The output of frequency measurement module connects the seizure input of dsp processor module; The SPI output of dsp processor module is connected with the input of data memory module; The input of exciting current adaptation module is connected with the exciting current output of intelligent power cabinet unit, and the output of exciting current adaptation module is connected with the input of the inside A/D of dsp processor module; The CAN1 communication output of dsp processor module is connected with the input of the first data transmit-receive module is two-way, and the output of the first data transmit-receive module is connected with the intelligent power unit with intelligent display unit respectively that input is two-way to be connected; The CAN2 communication output of dsp processor module is connected with the input of the second data transmit-receive module is two-way, and the output of the second data transmit-receive module is connected with the intelligent power unit with intelligent display unit respectively that input is two-way to be connected.
2. according to the said control system of claim 1, it is characterized in that said switching input module is by low-pass filter circuit, optically coupled isolation circuit, diode display circuit and logical transition the electric circuit constitute, after its first order circuit carries out low-pass filtering to 24V switching value signal, by the second level optically coupled isolation circuit signal is converted to 5V and by diode displaying, is delivered to the input of the first level switch module after the logical transition circuit negate by the third level again by 24V;
Said the first level switch module is made of with corresponding interface circuit level transferring chip, the 5V switching value signal that collects is converted to the I/O input that inputs to the dsp processor module behind the 3.3V; Said second electrical level modular converter is made of with corresponding interface circuit level transferring chip, will be converted to from the 3.3V switching value signal that dsp processor module I/O output receives the input that inputs to switching value output module behind the 5V;
Said switching value output module is comprised of two-level logic change-over circuit, optically coupled isolation circuit and diode display circuit, with the 5V switching value signal that receives through twice logical transition, be converted to the 24V signal by optically coupled isolation circuit, and by diode displaying out, transfer out at last.
3. according to the said control system of claim 1, it is characterized in that said analog quantity adaptation module is comprised of the analog quantity pre-process circuit, the analog input signal comprises synchronous generator stator voltage and two kinds of baseband signals of stator current, discharge circuit by routine forms, by adapter circuit with the threephase stator voltage signal, the threephase stator current signal is adjusted to and satisfies the required voltage range of AC sampling module input, deliver to the input of AC sampling module, to finish simultaneously the phase in the adaptive stator voltage three-phase, be delivered to the input of frequency measurement module; Said threephase stator current signal need be converted to voltage signal through behind the electric resistance partial pressure.
4. according to the said control system of claim 1; it is characterized in that said frequency measurement module is comprised of than output circuit, output violent change protective circuit filter circuit, input saturation circuit, voltage ratio; with single-phase stator voltage signal, the square-wave signal that is converted to 5V exports the seizure pin input end of dsp processor module to by these circuit.
5. according to the said control system of claim 1, the interface circuit that it is characterized in that said AC sampling module and dsp processor module is comprised of analog to digital converter and digital signal processor and relevant interface device, DSP finishes control by the logic control signal of control bus to analog to digital converter, after the analog signal input AC sampling A/D chip after the analog module processing, directly be converted to the digital signal that can satisfy the requirement of DSP input terminal voltage and input the data input pin of dsp chip by data/address bus, then process the control parameter that obtains being correlated with according to the designed AC sampling algorithm of software.
6. according to the said control system of claim 1, it is characterized in that said data memory module is comprised of outside extended menory, DSP by SPI with extend out ferroelectric memory and be connected, in system's running, realize the simple and direct communication of high speed, preserve at any time the switching value information and the time tag that gather in the course of work, finish the reading and writing of data, and support power down to preserve.
7. according to the said control system of claim 1, it is characterized in that said exciting current adaptation module mainly is comprised of the exciting current adapter circuit, after it will become voltage signal by electric resistance partial pressure from the exciting current signal that the intelligent power cabinet unit collects, again by rational amplifier adapter circuit, the exciting current signal is treated to satisfies dsp processor inside modules A/D and input desired voltage signal, flow to the dsp processor unit, finish excitation controller to the sampling of system's exciting current signal.
8. according to the said control system of claim 1, it is characterized in that said data transmit-receive module, comprise the first data transmit-receive module and the second data transmit-receive module, formed by the CAN communicating circuit, mainly comprise optically coupled isolation circuit, CAN transmission circuit and relevant adapter circuit, realize the light isolation of CAN communication signal, digital received and sent work; The input of the first data transmit-receive module and the second data transmit-receive module is connected to form two CAN net redundant networks with the CAN1 communication port of dsp processor module and CAN2 communication port respectively, the output of data transmit-receive module is connected with the communication input port of intelligent display module and intelligent power cabinet unit, consist of the two CAN Netcom of redundant high-speed news network, wherein each node of communication network has the network self-checking function, when network breaks down, the automatic switchover of operational network and backup network be can realize, and then safety and the stability of excitation system operation guaranteed.
9. the method for work of the said Digital Excitation Control System based on 32 floating type processors of a claim 1 is characterized in that comprising the steps:
1) by analog quantity adaptation module, AC sampling module, realize the sampling work of generator threephase stator voltage, threephase stator electric current, generator outlet frequency signal, can finish sampling to system's exciting current by the exciting current adaptation module, after all sampled signals enter the dsp processor unit, calculate the voltage effective value, current effective value, active power, reactive power of generator system and every data in current excitation system power loop through software;
2) by switching input module and the first level switch module, excitation controller is finished the collection to system switching amount signal, so detect current generator system stopped status, trystate, no-load running state or and guipure carry state, operational mode and other switching value information;
3) the central data processing module is identified, is judged and process the switching value signal that collects and the every data that calculate, and according to the running status of current generator system, after PID calculating and various protection limiting program check correction, draw the control angle α of the required phase-shift pulse in intelligent power loop;
4) last dsp processor unit sends to the intelligent power cabinet unit by fieldbus, and power cell can produce trigger impulse and then finish triggering to thyristor in the rectifier bridge, the output exciting current according to control angle; Simultaneously, by fieldbus various data and quantity of state are sent to intelligent display unit, the demonstration of the various variablees of completion system and figure;
The calculating of the signal described in the above-mentioned steps realizes with the software of excitation control law: at first, task manager by DSP passes through catching the processing of square-wave signal on the pin, can draw the electric voltage frequency of generator outlet, but the AC sampling by software phase-lock loop and AC sampling subprogram completion system analog quantity again; Can obtain voltage effective value, current effective value, active power, the reactive power of generator system by counting subroutine; Then can calculate the exciting current of system by the inner A/D converter of DSP; Can directly calculate the required current pilot angle α of control impuls by CPU according to the main logic of excitation system and various protection/limitation function subprogram; then send/accept subprogram by data pilot angle is sent to the intelligent power cabinet unit; finish forming of trigger impulse by it; the control rectifier bridge is finished the control to exciting current.
10. according to the method for work of the said control system of claim 9, it is characterized in that said software routines is:
AC sampling subprogram: the AC sampling of finishing analog quantity;
Switching value input subroutine: finish the input control to the system switching amount;
Switching value output subroutine: finish the output control to the system switching amount;
Software phase-lock loop subprogram: guarantee that the signal in each sampling period is within the same cycle;
Analog quantity counting subroutine: calculate generator terminal voltage, stator current, meritorious/idle, exciting current, exciting voltage;
The PID counting subroutine: calculate current rectifier bridge trigger angle α, and the various quantity of states of system;
Data sending/receiving subprogram: finish and other intelligent object between the data input and data output task;
The read/write subprogram of outer extension memory: finish the storage of some main fixed variables of excitation system;
Mark the one subprogram: the mark one of finishing every data calculates;
The main logic of excitation system and various defencive function subprogram: finish the logic of excitation system is judged and various protection and limitation function;
The software flow of exciting current control is as follows:
(1) system power-on reset;
(2) system program initialization: according to initialize routine, the every state of initialization system and each control register;
(3) close interruption: forbid all interruptions;
(4) initialization PIE interrupt vector table: program begins the interrupt vector of the system of reorientating, and makes it point to the interruption subroutine of user oneself definition;
(5) open interruption; Enable all interruptions;
(6) system enters main circulating program, waits for interrupting, and then enters next step user-defined system subroutine such as interrupt response, as interrupting without response, then continues to wait for;
(7) enter system subroutine after, program is divided into three branches to be moved respectively, respectively executing data storage program, switching value input program and analog quantity handling procedure;
In this step, be divided into again following steps for the analog quantity handling procedure:
1. carry out the frequency measurement program: finish the frequency measurement to the synchronous generator port of export;
2. can realize soft phase-locked loop according to measured system frequency, and then finish the AC sampling program;
3. according in the outer extension memory to the initial setting of some analog quantitys, finish the calculating to the system core analog quantity, and the analog quantity of needs deposited in the outer extension memory;
(8) executing data mark the one program is finished the standardization of main analog quantity;
(9) system running state and operational mode are confirmed in the switching value completion system identification of switch amount input program processing, finish PID and calculate, and obtain the control angle α of the current needs of system; Confirm simultaneously the various running statuses of system;
After executing previous step, system program divides two branch's operations:
(10) for through after the PID computing, reaffirm that the system mode assignment is to corresponding switching value;
(11) simultaneously, the execute protection limiting program is tested and is proofreaied and correct the pilot angle α that calculates;
(12) executing data receives the transmission program, and last pilot angle α and switching value are sent by fieldbus other node to system.
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| CN112825464B (en) * | 2019-11-20 | 2023-03-14 | 株洲中车时代电气股份有限公司 | Excitation control device configured with multi-network redundancy |
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