CN102691583B - Constant speed and constant frequence double-closed-loop control system and method for small-power diesel generator - Google Patents
Constant speed and constant frequence double-closed-loop control system and method for small-power diesel generator Download PDFInfo
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- CN102691583B CN102691583B CN201110387032.8A CN201110387032A CN102691583B CN 102691583 B CN102691583 B CN 102691583B CN 201110387032 A CN201110387032 A CN 201110387032A CN 102691583 B CN102691583 B CN 102691583B
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Abstract
The invention relates to a constant speed and constant frequence double-closed-loop control system and a method for a small-power diesel generator. The control system consists of a diesel engine rotation speed closed loop serving as an inner loop, and a generator set frequency closed loop serving as an outer loop, wherein the error input of the generator set frequency closed loop serves the input of the diesel engine rotation speed closed loop after being adjusted by a PID (Proportion Integration Differentiation) controller; the power output of a diesel engine is used for driving a generator set through a drive system; and the error input of the generator set frequency closed loop is a difference value between a preset frequency and the frequency measurement value of the generator set. By the system and the method, the accurate control on the rotation speed of different types of diesel engines can be realized, and the frequency fluctuation problem of the generator set can be solved.
Description
Technical field
The present invention relates to a kind of diesel generator field, particularly its control system and method.
Background technique
Diesel Engine Digital Electronic Speed System is in fact belong to speed control system, i.e. velocity close-loop control.Along with the development of automatic control technology, also more and more higher to the requirement of engine governed speed performance.Motor uses centrifugal mechanical governor at first.Centrifugal mechanical governor is as first generation speed regulator, and adjusting speed accuracy is poor, is mainly used in mini engine speed governing.Can be described as second generation speed regulator at the hydraulic machinery speed regulator of the mid-1970s extensive use, adjusting function increases, and is once widely used in electric power plant with internal combustion engine speed governing and Ship Power Equipment etc.Along with the raising that continuous increase and some special electricity consumption object of generating set capacity require power supply quality, there is again the all-electronin speed regulator taking analog circut as core, third generation speed regulator can be summarized as.In recent years, the speed governing of diesel engine also turns to digital control from traditional simulation technique, has occurred the forth generation Digital governor taking microprocessor as core.As the R082 type of German MTU company, the PROACTI/II/I I/IV series of WOODWARD company of the U.S., the MG-80 type digital electronic governor etc. of Japanese NABCO company.Adjust as a new generation's electricity, digital electric is adjusted has the advantages such as algorithm is flexible, precision is high, antijamming capability is strong, and since 90 mid-nineties 90s, in engine governed speed field, oneself promotes gradually for it.
Diesel Engine Digital Electronic Speed System has the characteristics such as complicated non-linear, time lag, time-varying Hurst index because of it, is difficult to set up accurate mathematical model to it.PID controls a kind of Engineering Control method generally adopted as actual production process, have amount of calculation little, real-time, be easy to the features such as realization, therefore, be widely adopted in speed governing field.At present, domestic and international diesel generating set electronic speed regulator all realizes based on PID control technique, and great majority still adopt analog circut to realize.Most typical two companies are Woodward Governor Co., Ltd. of the U.S. and German glycolylurea hereby Man.This two companies product all adopts analog circut to realize PID arithmetic.Its specific implementation is distinguished again to some extent: the proportional component of Woodward Governor Co., Ltd. have employed PHASE-LOCKED LOOP PLL TECHNIQUE, and it is input as frequency quantity.Glycolylurea hereby Man then adopts pressure switch technology frequently that the frequency signal of electromagnetic sensor is converted to voltage, then compares and enlarges process.For digital electronic governor, only have Xin Ge Sida Company of the U.S. to have commercially produced product both at home and abroad, it controls to be still and adopts common pid computing, and each parameter tuning must adjust accordingly with corollary equipment.For improve further digital electric adjust performance index, still need in control theory and control algorithm etc. strengthening research.
The foreign brand name of electronic governor mainly contains German glycolylurea hereby Man, ABB AB of Switzerland, German Bosch company, AMBAC company of the U.S. and Xin Ge Sida Company of the U.S. etc.; Home brands mainly contain Lanzhou Inst. of Electric Vehicle and wound power etc. is inspired confidence in Shanghai.
Comprehensive present Research both at home and abroad, at present, the control for small power diesel generators power supply voltage frequency realizes by diesel engine speed regulator, still belongs to blank for controlling the constant digital double-closed-loop control method of small power diesel generators frequency of supply.Given this, the small power diesel generators double-closed-loop control method that this patent proposes is the core that diesel generating set output voltage frequency keeps constant, the various forms of speed adjusting technique of alternative existing small power diesel generators, with solve strong inside and outside disturbance cause output voltage frequency to fluctuate problem.
Summary of the invention
The object of this invention is to provide System for Small Power Diesel Generator constant-speed and constant-frequency double closed-loop control system and method, in order to the frequency fluctuation problem of the accurate control and generator set that solve dissimilar diesel engine speed.
For achieving the above object, system schema of the present invention is: small power diesel generators constant-speed and constant-frequency double closed-loop control system, this control system is made up of the diesel engine speed closed loop as inner ring and the generator set frequency closed loop as outer shroud, the error input of described generator set frequency closed loop is as the input of diesel engine speed closed loop after PID controller regulates, and the Power output of described diesel engine is by transmission system drives generator set; The error of described generator set frequency closed loop is input as the difference of setpoint frequency and generator set frequency measurement.
Output to actuator after the input of described diesel engine speed closed loop and the difference of diesel engine speed measured value are regulated by a self adaption rotational speed governor, actuating mechanism controls connects Injection Pump, by controlling the rotating speed of the fuel delivery regulation and control diesel engine of Injection Pump.
Described diesel engine speed measured value is obtained by the speed probe be arranged on diesel engine output shaft.
Described generator set frequency measurement is obtained by the voltage transducer and corresponding digital signal processing circuit being arranged on generator output end.
Method scheme of the present invention is: carry out diesel engine speed closed loop control and generator set Frequency servo to diesel generator, and diesel engine speed closed loop is inner ring, and generator set frequency closed loop is outer shroud; And making the error input of generator set frequency closed loop as the input of diesel engine speed closed loop after PID controller regulates, the error of described generator set frequency closed loop is input as the difference of setpoint frequency and generator set frequency measurement.
Diesel engine start and stopping process time, adopt der Geschwindigkeitkreis to control diesel generator, when normal work and load changing process, employing speed closed loop and frequency closed loop control diesel generator.
Diesel generating set work process is divided into startup, normal work, load changing and shutdown four mode of operations.Starting and shutting down mode of operation adopts speed closed loop to control diesel engine, under normal work and load changing mode of operation, adopt rotating speed and frequency closed loop to control diesel engine.
According to diesel engine starting and stopping signal, der Geschwindigkeitkreis is directly used to control; Set a steady-sxtate wave motion rate, characterize the fluctuation ratio of diesel engine speed, when overshoot rate exceedes steady-sxtate wave motion rate, be load changing mode of operation, other situations are normal mode of operation.The judgement of these patterns realizes by controller software.
Both can implement to jointly control to diesel engine speed and generator set output voltage frequency, independent control can have been implemented respectively again, to realize diesel generating set rotating speed or frequency stabilization.Adopting control system of the present invention, efficiently solving the generator set output voltage frequency fluctuation problem because causing in power transmission mode between diesel engine and generator (as rigid connection, flexibly jointed chain) and varying load situation.
Accompanying drawing explanation
Fig. 1 is double closed-loop control system block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
System embodiment
As shown in Figure 1, System for Small Power Diesel Generator constant-speed and constant-frequency double closed-loop control system is made up of diesel engine speed closed loop (hereinafter referred to as speed closed loop) and generator set (output voltage) frequency closed loop (hereinafter referred to as frequency closed loop) two links, speed closed loop is inner ring, and frequency closed loop is outer shroud.
Output to actuator after the input of speed closed loop and the error of diesel engine speed measured value are regulated by a self adaption rotational speed governor, actuating mechanism controls connects Injection Pump, by controlling the rotating speed of the fuel delivery regulation and control diesel engine of Injection Pump.The output of speed closed loop connects generator set by transmission system drives, and the generating voltage frequency of generator set is the output quantity of frequency closed loop.The error input of frequency closed loop is as the input of speed closed loop after PID controller regulates, and the error of frequency closed loop is input as the difference of setpoint frequency and generator set frequency measurement.Diesel engine speed measured value is obtained by the speed probe be arranged on flywheel shell of diesel engine.Speed closed loop is run under setting working speed by diesel engine stability contorting, tach signal is detected by the rotating speed electromagnetic sensor be arranged on flywheel casing, according to measuring the deviation of rotating speed with setting working speed, control actuator by self adaption rotational speed governor and change accelerator rod position, regulate fuel delivery size, reduce rotating speed deviation, thus realize the automatic adjustment of rotating speed.Generator set frequency measurement, by being arranged on the voltage measuring transformer output voltage signal of generator output end, then processes the frequency obtaining this voltage signal to this voltage signal by corresponding digital signal processing circuit.According to the deviation of measuring frequency with setting frequency of okperation, as the input quantity of speed closed loop after PID controller regulates.
Embodiment of the method
The feature of method of the present invention is on the basis of diesel engine speed closed loop, increase the generating voltage Frequency servo of a generator, and using frequency closed loop as outer shroud, make the error input of generator set frequency closed loop as the input of diesel engine speed closed loop after PID controller regulates, the error of described generator set frequency closed loop is input as the error of setpoint frequency and generator set frequency measurement.
Diesel generating set by starting, normally work, load changing and shutdown four working procedure form, to start and stopping process adopts and only adopts a speed closed loop to control, at normal work and load changing process employing double-closed-loop control.According to diesel engine starting and stopping signal, der Geschwindigkeitkreis is directly used to control; Set a steady-sxtate wave motion rate, characterize the fluctuation ratio of diesel engine speed, when overshoot rate exceedes steady-sxtate wave motion rate, be load changing mode of operation, other situations are normal mode of operation.SC system controller accepts diesel engine starting and stopping signal, and detection judges the information such as fluctuation ratio, so the judgement of above-mentioned pattern is by SC system controller software simulating.
Claims (6)
1. small power diesel generators constant-speed and constant-frequency double closed-loop control system, it is characterized in that, this control system is made up of the diesel engine speed closed loop as inner ring and the generator set frequency closed loop as outer shroud, the error input of described generator set frequency closed loop is as the input of diesel engine speed closed loop after PID controller regulates, and the Power output of described diesel engine is by transmission system drives generator set; The error of described generator set frequency closed loop is input as the difference of setpoint frequency and generator set frequency measurement; Described control system solves the generator set output voltage frequency fluctuation problem because causing in power transmission mode between diesel engine and generator and varying load situation.
2. small power diesel generators constant-speed and constant-frequency double closed-loop control system according to claim 1, it is characterized in that, actuator is outputted to after the input of described diesel engine speed closed loop and the difference of diesel engine speed measured value are regulated by a self adaption rotational speed governor, actuating mechanism controls connects Injection Pump, by controlling the rotating speed of the fuel delivery regulation and control diesel engine of Injection Pump.
3. small power diesel generators constant-speed and constant-frequency double closed-loop control system according to claim 2, is characterized in that, described diesel engine speed measured value is obtained by the speed probe be arranged on diesel engine output shaft.
4. the small power diesel generators constant-speed and constant-frequency double closed-loop control system according to claim 1 or 2 or 3, it is characterized in that, described generator set frequency measurement is obtained by the voltage transducer and corresponding digital signal processing circuit being arranged on generator output end.
5. small power diesel generators constant-speed and constant-frequency double-closed-loop control method, is characterized in that, carries out diesel engine speed closed loop control and generator set Frequency servo to diesel generator, and diesel engine speed closed loop is inner ring, and generator set frequency closed loop is outer shroud; And making the error input of generator set frequency closed loop as the input of diesel engine speed closed loop after PID controller regulates, the error of described generator set frequency closed loop is input as the difference of setpoint frequency and generator set frequency measurement; Described controlling method solves the generator set output voltage frequency fluctuation problem because causing in power transmission mode between diesel engine and generator and varying load situation.
6. small power diesel generators constant-speed and constant-frequency double-closed-loop control method according to claim 5; it is characterized in that; diesel engine start and stopping process time; der Geschwindigkeitkreis is adopted to control diesel generator; when normal work and load changing process, speed closed loop and frequency closed loop is adopted to control diesel generator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110387032.8A CN102691583B (en) | 2011-11-29 | 2011-11-29 | Constant speed and constant frequence double-closed-loop control system and method for small-power diesel generator |
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| CN201110387032.8A CN102691583B (en) | 2011-11-29 | 2011-11-29 | Constant speed and constant frequence double-closed-loop control system and method for small-power diesel generator |
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| CN102691583A CN102691583A (en) | 2012-09-26 |
| CN102691583B true CN102691583B (en) | 2015-06-17 |
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| CN103485914B (en) * | 2013-09-26 | 2016-01-06 | 南车戚墅堰机车有限公司 | Diesel engine of diesel locomotive rotational speed setup signal scaling system and controlling method thereof |
| CN107255051A (en) * | 2017-06-20 | 2017-10-17 | 吴联凯 | A kind of vehicle power power-generating control system and control method |
| CN107165725A (en) * | 2017-06-20 | 2017-09-15 | 吴联凯 | A kind of control method of dynamic power for emergency management and rescue vehicle |
| CN109188962B (en) * | 2018-08-23 | 2021-08-10 | 惠州海卓科赛医疗有限公司 | Double closed-loop control algorithm of control system |
| CN112202384B (en) * | 2020-08-25 | 2022-06-24 | 海南广源隆节能环保股份有限公司 | Automatic control safety protection method and device for photoelectric water control system |
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| CN2355494Y (en) * | 1997-11-12 | 1999-12-22 | 湛江海洋大学工程学院 | Synchronous power generator with electrohydraulic control by marine engine shaft |
| CN101815628A (en) * | 2007-07-10 | 2010-08-25 | 轮廓硬化公司 | Ac electrical generation system |
| CN201696147U (en) * | 2010-06-08 | 2011-01-05 | 郑州金阳电气有限公司 | Electronic speed regulator for diesel generator set |
| CN202451288U (en) * | 2011-11-29 | 2012-09-26 | 河南科技大学 | Constant-speed constant-frequency double closed loop control system of low-power diesel generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2756827C (en) * | 2009-04-21 | 2016-06-14 | Gen-Tech Llc | Power generator system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2355494Y (en) * | 1997-11-12 | 1999-12-22 | 湛江海洋大学工程学院 | Synchronous power generator with electrohydraulic control by marine engine shaft |
| CN101815628A (en) * | 2007-07-10 | 2010-08-25 | 轮廓硬化公司 | Ac electrical generation system |
| CN201696147U (en) * | 2010-06-08 | 2011-01-05 | 郑州金阳电气有限公司 | Electronic speed regulator for diesel generator set |
| CN202451288U (en) * | 2011-11-29 | 2012-09-26 | 河南科技大学 | Constant-speed constant-frequency double closed loop control system of low-power diesel generator |
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