CN104156513A - Model for modeling large steam turbine generator with function of static excitation - Google Patents
Model for modeling large steam turbine generator with function of static excitation Download PDFInfo
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- CN104156513A CN104156513A CN201410360871.4A CN201410360871A CN104156513A CN 104156513 A CN104156513 A CN 104156513A CN 201410360871 A CN201410360871 A CN 201410360871A CN 104156513 A CN104156513 A CN 104156513A
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Abstract
The invention discloses a model for modeling a large steam turbine generator with a function of static excitation. The model comprises a static excitation subsystem model, an excitation winding subsystem model and a rotor shafting subsystem model; the static excitation subsystem model implemented by a modeling method considers ground capacitance of a neutral point; the excitation winding subsystem model considers the influence of input-output upon an end and excitation winding loss related to frequency; the rotor shaft system subsystem model considers ground capacitance of a rotor shaft and shafting impedance of a steam turbine. The output end of the static excitation subsystem model is connected to the input end of the excitation winding subsystem model. The output end of the static excitation subsystem model is connected to the input end of the excitation winding subsystem model. The output end of the excitation winding subsystem model is connected to the input end of the rotor shafting subsystem model. The static excitation subsystem model of the generator is established, the excitation winding subsystem model and the rotor shafting subsystem model are established, shaft voltage waveform produced by a static excitation system can be acquired for the generator in a simulation manner, and simulation analysis and research for control of shaft voltage is facilitated. The model has the advantages of simple structure, easiness in implementation and high precision.
Description
Technical field
The present invention relates to a kind of modeler model of large turbo-type generator of static excitation, belong to turbodynamo technical field.
Background technology
Turbodynamo, as one of nucleus equipment of electrical energy production, is being undertaken very important task in electric system.The fault of generator and stoppage in transit, not only can damage expensive motor body, and will directly threaten safety and the reliable power supply of electric system.Along with the increase of genset single-machine capacity, by shaft voltage problem, cause that bearing shell damage accident should cause enough attention.If it is not kept a close eye on and takes safeguard procedures; shaft voltage is enough to puncture the oil film between axle and bearing and discharges; cause motor component damage, acceleration mechanical wearing and tearing, when serious, also can cause bearing shell burn out and by forced-stopping machine, cause unnecessary maintenance and power generation loss.
In recent years, along with the fast development of Power Electronic Technique, static excitation system is used widely in large turbo-type generator, cause a kind of new, frequency is higher, the shaft voltage source that amplitude is larger.Static excitation system is worked alternating voltage by thyristor rectifier output dc voltage, therefore unavoidably in the output of excitation system, there is flutter component, and between rotor winding and macro-axis, there is coupling capacitance, macro-axis in service can produce ac coupling capacitor voltage because of electromagnetic induction phenomenon.Shaft voltage amplitude that static excitation system causes is very high and have high-frequency fluctuation, is the high fdrequency component place in whole shaft voltage, and waveform has complicated harmonic pulse component, much higher when its peak pulse is than heavy load in the light hours, needs key protection.
MATLAB is a kind of software platform that integrates mathematical computations, analysis, visual, algorithm development and issue etc., comprises two large divisions: mathematical computations and Engineering Simulation.In Engineering Simulation SIMULINK environment, use SimPowerSystems storehouse, electric system simulation tool box, carry out electric power, electronic system modeling and simulation has a wide range of applications in electric system.SimPowerSystems is mainly comprised of application word bank, power supply word bank, element word bank, additional word bank, motor word bank, measurement word bank and these seven module librarys of power electronics word bank, assembled package goes out more complicated module as required simultaneously, can to studied object, carry out various Digital Simulation modelings easily thus, understand electric parameter and change the impact on Power System Analysis, operation, proof theory analysis result.
Summary of the invention
The object of the present invention is to provide a kind of modeler model of large turbo-type generator of static excitation, the shaft voltage that static excitation system is caused carries out simulation modeling, is convenient to the control of shaft voltage to carry out simulation analysis and research.
The technical solution adopted in the present invention is: the modeler model of the large turbo-type generator of static excitation, the static excitation subsystem model of neutral point ground capacitance that comprised the consideration that realizes by modeling method, considered the impact of inputoutput pair end and with the field copper subsystem model of the field copper loss of frequency dependence and considered the rotor axial system subsystem model of armature spindle ground capacitance and turbine shafting impedance, the input end of the output terminal access field copper subsystem model of described static excitation subsystem model, the input end of the output terminal access rotor axial system subsystem model of described field copper subsystem model.
Described static excitation subsystem model comprises: three-phase alternating current source model: for three-phase alternating voltage signal is provided; Three-phase transformer model: for regulation output voltage magnitude; The former limit of described three-phase transformer model adopts triangle to connect, and secondary adopts Y-connection; Three-phase full-controlled bridge model: the alternating voltage of three-phase transformer model output is changed and changes six pulsed dc voltages into; Synchronous six generator models: for sending pulse triggering signal, control six thyristors that trigger three-phase full-controlled bridge model; Oscillograph one model: for observing common mode voltage U
c; Capacitor model C
w: for simulating neutral point ground capacitance.
Described field copper subsystem model comprises: the first coil former: for simulating first coil of generator excitation winding; Last coil former: for simulating last coil of generator excitation winding; Intermediate coil model: for simulating the intermediate coil of generator excitation winding; Passive RL loop model RL
c1, RL
c2: for the analog equivalent field copper loss relevant with frequency, RL
c1, RL
c2by the resistance being connected in parallel and inductance, form; Described the first coil former, intermediate coil model and last coil former are connected in series; RL
c1, RL
c2be connected on respectively on the input end, output terminal of intermediate coil model.
Described rotor axial system subsystem model comprises: for simulating the inductor models L of steam turbine high-pressure cylinder
hpt; For the inductor models L that simulates Steam Turbine Through IP Admission
mpt; Be respectively used to simulate the inductor models L of two low pressure (LP) cylinders of steam turbine
lpt0, inductor models L
lpt; For simulating the impedance model R of generator ground brush
brush; For simulating passive RL loop model RLi1, the RLi2 of the impedance of electricity generator stator core inner rotor shaft and frequency dependence; Capacitor model for model rotor axle ground capacitance; Oscillograph two models for output display shaft voltage.
The beneficial effect that the present invention reaches is: by building generator static excitation subsystem model and setting up field copper and the subsystem model of rotor axial system, can obtain to emulation the shaft voltage waveform that generator is produced by static excitation system, be convenient to the control of shaft voltage to carry out simulation analysis and research, the present invention has advantages of that model structure is simple, be easy to realization, degree of accuracy is high.
Accompanying drawing explanation
Fig. 1 is modeling structure block diagram of the present invention.
Fig. 2 is steam turbine generator system structural drawing.
Fig. 3 is common mode voltage and shaft voltage equivalent circuit diagram.
Fig. 4 is static excitation subsystem model figure.
Fig. 5 is field copper subsystem model figure.
Fig. 6 is rotor axial system subsystem model figure.
Fig. 7 is MATLAB/Power System modeling structure figure of the present invention.
Fig. 8 is MATLAB/Power System simulation result figure of the present invention.
Fig. 9 is the pi-network of the first coil former and last coil former.
Figure 10 is the pi-network of intermediate coil model.
In figure: 1, steam turbine; 1a, high pressure cylinder; 1b, intermediate pressure cylinder; 1c, low pressure (LP) cylinder; 2, generator; 2a, armature spindle; 2b, casing; 2c, field copper; 2d, stator; 2e, rotor core; 3, rectification excitation system; 3a, three-phase full-controlled bridge; 3b, three-phase transformer; 4, oscillograph one model; 5, oscillograph two models.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples are only for technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
As shown in Figure 2, steam turbine generator system comprises steam turbine 1, generator 2 and rectification excitation system 3, and steam turbine 1 comprises a high pressure cylinder 1a, an intermediate pressure cylinder 1b and two low pressure (LP) cylinder 1c; Generator 2 comprises casing 2b, armature spindle 2a, rotor core 2e, field copper 2c and the stator 2d consisting of stator core and stator winding; Rectification excitation system 3 adopts three-phase thyristor bridge rectification excitation system, the three-phase full-controlled bridge 3a that comprises three-phase transformer 3b and formed by six thyristors, adopt three-phase thyristor bridge rectification that three-phase alternating voltage is transformed to six pulsed dc voltages, negative edge by step signal enables synchronous six pulse producers, adopt Two-pulse triggering, 30 ° of initial phase angles, in power frequency period, six thyristor impulse phases differ 60 ° successively.In figure, C
tfor field copper is to rotor core electric capacity, C
wfor neutral point ground capacitance, C
sfor armature spindle ground capacitance, U
1and U
2be respectively the voltage of the anodal A of rectification output end neutral point C relative to negative pole B, direct current output field voltage is U
d=U
1-U
2, common mode voltage is U
c=(U
1+ U
2)/2.The typical waveform of common mode voltage is the voltage jump square wave of three times of fundamental frequencies, symmetrical in the situation that, only has common mode voltage U
caffect shaft voltage U
s, its equivalent electrical circuit shows as Fig. 3.Common mode voltage UC is equivalent to a voltage source, by three capacitor C
t, C
w, C
sform a closed-loop path, shaft voltage is armature spindle ground capacitance C
son dividing potential drop, can obtain
As shown in Figure 1, be modeling structure block diagram of the present invention, comprise static excitation subsystem model, field copper subsystem model and rotor axial system subsystem model.As shown in Figure 7, be MATLAB/Power System modeling structure figure, the input end of the output terminal access field copper subsystem model of static excitation subsystem model, the input end of the output terminal access rotor axial system subsystem model of field copper subsystem model.Powergui, Clock, workspace1 and workspace are needed control in SimPowerSystems emulation, and powergui is electric system simulation module, for electric power system data analytical calculation; Clock is clock module, for providing and show the function of simulation time; Workspace1 and workspace are respectively used to holding time variable and shaft voltage variable.
As shown in Figure 4, be static excitation subsystem model figure, comprising: three-phase alternating current source model: for simulating three-phase alternating-current supply, provide three-phase alternating voltage signal; Three-phase transformer model: for simulating three-phase transformer 3b, for regulation output voltage magnitude, three-phase transformer model adapts with three-phase transformer 3b: former limit adopts triangle to be connected, and secondary adopts Y-connection; Three-phase full-controlled bridge model: for simulating three-phase full-controlled bridge 3a, the alternating voltage of three-phase transformer model output is changed and changes six pulsed dc voltages into; Synchronous six generator models: for simulating synchronous six pulse producers, send pulse triggering signal, control six thyristors that trigger three-phase full-controlled bridge model; Oscillograph one model 4: for observing common mode voltage U
c.Consider neutral point ground capacitance, static excitation subsystem model is also provided with for simulating the capacitor model C of neutral point ground capacitance
w.
As shown in Figure 5, be field copper subsystem model figure, the first coil former, intermediate coil model and last coil former are connected in series.Consider the impact of inputoutput pair end, separately to first coil of field copper and last coil modeling.The first coil former: for simulating first coil of generator excitation winding; Last coil former: for simulating last coil of generator excitation winding.The first coil former is identical with last coil former syndeton, wherein C
t0=C
t1=C
t2=...=C
t26=C
t27, L
t0=L
t1=L
t2=...=L
t26=L
t27, the first coil former and last coil former are composed in series by some groups of pi-networks as shown in Figure 9, and this pi-network is by inductance L
t0and capacitor C
t0, capacitor C
t1' form.Each group pi-network analog equivalent one circle field copper, is graphic simplicity, in Fig. 5 by two capacitor C in parallel
txbe equivalent to 2C
tx, x=0 wherein, 1,2 ... 26,27.Intermediate coil model: for simulating the intermediate coil of generator excitation winding, intermediate coil model pi-network is as shown in Figure 10 composed in series, each group pi-network analog equivalent half turn field copper.C wherein
c=C
c1=C
c2=...=C
c22=C
c23, L
c=L
c1=L
c2=...=L
c22=L
c23, identical, in Fig. 5, be graphic simplicity, by two electric capacity in parallel
be equivalent to a C
cy, y=1 wherein, 2 ... 22,23.Consider within the scope of certain frequency, with the field copper loss of frequency dependence, adopt passive RL loop model to carry out analog equivalent.Passive RL loop is comprised of the resistance being connected in parallel and inductance.The input end of the intermediate coil model passive RL loop model RL that connects
c1, the output terminal passive RL loop model RL that connects
c2.In figure, R
c0and R
c1all for the resistance of analog equivalent field copper.
As shown in Figure 6, be rotor axial system subsystem model figure.In steam turbine part, the inductance between armature spindle and cylinder has determined the impedance of axle system, considers turbine shafting impedance, respectively low pressure (LP) cylinder, intermediate pressure cylinder, high pressure cylinder is carried out to analog equivalent with a corresponding inductance: inductor models L
hptbe used for simulating steam turbine high-pressure cylinder, inductor models L
mptbe used for simulating Steam Turbine Through IP Admission, inductor models L
lpt0, inductor models L
lptbe respectively used to simulate two low pressure (LP) cylinders of steam turbine, C
oil1for analog equivalent steam turbine cylinder pressure side armature spindle ground capacitance, C
oil2and C
oil3be respectively used to simulate the ground capacitance of two low pressure (LP) cylinders, C
oil4for simulating ground capacitance, the C of intermediate pressure cylinder
oil5ground capacitance for simulated high-pressure cylinder.C
oilbe used for simulating excitation side armature spindle ground capacitance, impedance model R
brushbe used for simulating generator ground brush, C
insfor the ground capacitance of analogue ground brush, armature spindle ground capacitance C
s=C
oil+ C
ins.For high frequency shaft voltage, because armature spindle impedance is larger, generator one end dress ground brush is on the not too many impact of the other end.Passive RL loop model RLi1, RLi2 are for simulating the impedance of electricity generator stator core inner rotor shaft and frequency dependence.R
i0for the impedance of analog equivalent generator rotor shaft, oscillograph two models 5 are for output display shaft voltage U
s.
As shown in Figure 8, be by after MATLAB/Power System emulation, the shaft voltage Us oscillogram simulation result figure of oscillograph two model 5 output displays.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (4)
1. the modeler model of the large turbo-type generator of static excitation, it is characterized in that, the static excitation subsystem model of neutral point ground capacitance that comprised the consideration that realizes by modeling method, considered the impact of inputoutput pair end and with the field copper subsystem model of the field copper loss of frequency dependence and considered the rotor axial system subsystem model of armature spindle ground capacitance and turbine shafting impedance, the input end of the output terminal access field copper subsystem model of described static excitation subsystem model, the input end of the output terminal access rotor axial system subsystem model of described field copper subsystem model.
2. the modeler model of the large turbo-type generator of static excitation according to claim 1, is characterized in that, described static excitation subsystem model comprises:
Three-phase alternating current source model: for three-phase alternating voltage signal is provided;
Three-phase transformer model: for regulation output voltage magnitude; The former limit of described three-phase transformer model adopts triangle to connect, and secondary adopts Y-connection;
Three-phase full-controlled bridge model: the alternating voltage of three-phase transformer model output is changed and changes six pulsed dc voltages into;
Synchronous six generator models: for sending pulse triggering signal, control six thyristors that trigger three-phase full-controlled bridge model;
Oscillograph one model: for observing common mode voltage U
c;
Capacitor model C
w: for simulating neutral point ground capacitance.
3. the modeler model of the large turbo-type generator of static excitation according to claim 2, is characterized in that, described field copper subsystem model comprises:
The first coil former: for simulating first coil of generator excitation winding;
Last coil former: for simulating last coil of generator excitation winding;
Intermediate coil model: for simulating the intermediate coil of generator excitation winding;
Passive RL loop model RL
c1, RL
c2: for the analog equivalent field copper loss relevant with frequency, RL
c1, RL
c2by the resistance being connected in parallel and inductance, form;
Described the first coil former, intermediate coil model and last coil former are connected in series;
RL
c1, RL
c2be connected on respectively on the input end, output terminal of intermediate coil model.
4. the modeler model of the large turbo-type generator of static excitation according to claim 3, is characterized in that, described rotor axial system subsystem model comprises:
For simulating the inductor models L of steam turbine high-pressure cylinder
hpt;
For the inductor models L that simulates Steam Turbine Through IP Admission
mpt;
Be respectively used to simulate the inductor models L of two low pressure (LP) cylinders of steam turbine
lpt0, inductor models L
lpt;
For simulating the impedance model R of generator ground brush
brush;
For simulating passive RL loop model RLi1, the RLi2 of the impedance of electricity generator stator core inner rotor shaft and frequency dependence;
Capacitor model for model rotor axle ground capacitance;
Oscillograph two models for output display shaft voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410360871.4A CN104156513A (en) | 2014-07-25 | 2014-07-25 | Model for modeling large steam turbine generator with function of static excitation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410360871.4A CN104156513A (en) | 2014-07-25 | 2014-07-25 | Model for modeling large steam turbine generator with function of static excitation |
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| Publication Number | Publication Date |
|---|---|
| CN104156513A true CN104156513A (en) | 2014-11-19 |
Family
ID=51882011
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548655A (en) * | 2015-12-07 | 2016-05-04 | 辽宁东科电力有限公司 | Device for monitoring and controlling shaft voltage and shaft current of turbo-generator online |
| CN110767048A (en) * | 2018-07-25 | 2020-02-07 | 中国石油化工股份有限公司 | Steam extraction heat supply generating set simulation system |
| CN110767047A (en) * | 2018-07-25 | 2020-02-07 | 中国石油化工股份有限公司 | Multi-axis simulation system of thermoelectric unit |
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| US20040085051A1 (en) * | 2002-10-30 | 2004-05-06 | Kim Chan Ki | Static excitation system having capability of eliminating shaft vibrations of a generator and overvoltage when underexited |
| CN204028910U (en) * | 2014-07-25 | 2014-12-17 | 国家电网公司 | The modeler model of the large turbo-type generator of static excitation |
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2014
- 2014-07-25 CN CN201410360871.4A patent/CN104156513A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040085051A1 (en) * | 2002-10-30 | 2004-05-06 | Kim Chan Ki | Static excitation system having capability of eliminating shaft vibrations of a generator and overvoltage when underexited |
| CN204028910U (en) * | 2014-07-25 | 2014-12-17 | 国家电网公司 | The modeler model of the large turbo-type generator of static excitation |
Non-Patent Citations (3)
| Title |
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| WALTER N.ALERICH/JEFF KELJIK: "《电工技术（下册）》", 31 July 2001 * |
| 周春阳: "发电机转子绕组匝间绝缘监测装置的研究与设计", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548655A (en) * | 2015-12-07 | 2016-05-04 | 辽宁东科电力有限公司 | Device for monitoring and controlling shaft voltage and shaft current of turbo-generator online |
| CN110767048A (en) * | 2018-07-25 | 2020-02-07 | 中国石油化工股份有限公司 | Steam extraction heat supply generating set simulation system |
| CN110767047A (en) * | 2018-07-25 | 2020-02-07 | 中国石油化工股份有限公司 | Multi-axis simulation system of thermoelectric unit |
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Application publication date: 20141119 |
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