CN104730936A - Electromechanical transient model actual measuring and modeling method for nuclear power unit 39-phase self-excitation brushless excitation system - Google Patents
Electromechanical transient model actual measuring and modeling method for nuclear power unit 39-phase self-excitation brushless excitation system Download PDFInfo
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Abstract
The invention relates to an electromechanical transient model actual measuring and modeling method for a nuclear power unit 39-phase self-excitation brushless excitation system. Based on structure characteristics of the nuclear power unit 39-phase self-excitation brushless excitation system and static and dynamic test actually measured data, model parameters for power system electromechanical transient analysis are obtained, and verification is carried out on model precision in the stable analysis process. The method solves the problem that a nuclear power unit multi-phase rectifier brushless excitation system lacks calculation model parameters according with actual situations, the precision when an electromechanical transient program calculates nuclear power unit features can be effectively improved, and powerful supporting is provided for safe and stable operation of a power grid.
Description
Technical field
The present invention relates to field of power, be specifically related to a kind of nuclear power generating sets 39 phase self-excitation brushless excitation system machine-electricity transient model actual-measurement modeling method.
Background technology
Along with socioeconomic development, Electricity Demand constantly increases, the contradiction of the relatively in short supply and a large amount of disposal of pollutants of traditional fossil-fired unit of the energy.Nuclear energy is the modern energy that can substitute conventional energy resources on a large scale, not only clean but also economical.Because of atmosphere polluting problem, Construction of Nuclear Electricity is just restarted in current China.Reach 4,000 ten thousand kilowatts according to " planning of Chinese Nuclear Power Long-and Medium-term Development " China's nuclear power installed capacity in 2015, build 1,800 ten thousand kilowatts; The year two thousand twenty planning installed capacity reaches 5,800 ten thousand kilowatts, is building 3,000 ten thousand kilowatts.In technical field of nuclear power, nuclear power generating sets run high to excitation system reliability requirement.Concerning more than 10,000,000,000,000 jumbo nuclear power generating sets, poly phase rectification self-excitation brushless excitation system becomes first-selected excitation system undoubtedly because having the plurality of advantages such as axle system is short, high without rotor ring, poly phase rectification reliability, the life-span is grown.
The serial brushless exciter of TKJ produced with French Alstom company at the poly phase rectification brushless exciter of nuclear power application is at present for representative.The self-excitation brushless excitation system that the P320 V2 type field regulator that Alstom company of France produces and TKJ 167-45 type 39 phase brushless exciter combine all has application on 16 nuclear power generating sets such as China's Ningde nuclear power, Fuqing nuclear power, ridge Australia nuclear power, Fan family mountain nuclear power, red nuclear power along the river.The operation of this poly phase rectification self-excitation brushless excitation unit and the fired power generating unit relating to net stability contorting characteristic and conventional three-machine excitation system are very different, for electric system and nuclear power generating sets under research fault disturbance dynamic behaviour and the interphase interaction of machine net and influence each other, set up can accurate response advanced Nuclear Power unit encourage oneself brushless excitation system dynamic perfromance realistic model and to propose a set of feasible measurement technology be very necessary.But, much more compared with three-phase brushless exciter for armature terminal poly phase rectification brushless exciter, and rotate with rotor again, armature voltage cannot be measured, and this causes technical difficulty to the parameter of nuclear power brushless excitation system actual measurement modeling.
Summary of the invention
The object of the present invention is to provide a kind of nuclear power generating sets 39 phase self-excitation brushless excitation system machine-electricity transient model actual-measurement modeling method.
For achieving the above object, technical scheme of the present invention is: a kind of nuclear power generating sets 39 phase self-excitation brushless excitation system machine-electricity transient model actual-measurement modeling method, according to the design feature of nuclear power generating sets 39 phase self-excitation brushless excitation system, abstract simplification nuclear power generating sets excitation system electromechanical transient stability Calculation model, then carry out corresponding static state, dynamic test, test its each point of Link Model parameter, and check each Link Model parameters precision by contrast measured result and the method for simulation result and whether meet Power System Analysis needs.
In embodiments of the present invention, described method specifically comprises the steps,
Step 101: the physical arrangement of field regulator, three-phase controllable silicon power amplification unit, 39 phase brushless exciters and generator and design parameter in input nucleus group of motors excitation system, form excitation system initial model;
Step 102: according to excitation system initial model, analyzes the identifiability of its model parameter, and the parameter high to differentiability carries out actual measurement identification, and the parameter low to differentiability carries out matching identification;
Step 103: in unit stationary state, comprises set end voltage measurement links time constant Tr to field regulator model parameter, amplitude limit link carries out parameter actual measurement, carry out spectral characteristic test to PID link logical organization and parameter;
Step 104: carry out identification according to the parameter of static measured data to field regulator pid parameter, set end voltage measurement links time constant Tr, amplitude limit link;
Step 105: according to generator and exciter no load saturation characteristic calculating generator field voltage reference value, exciting current of exciter reference value, exciter excitation voltage reference value, generator and exciter saturation coefficient, calculates armature of exciter reaction demagnetization coefficient according to exciter load characteristic;
Step 106: calculate power of controlled silicon according to Cosine Phase-shift principle and amplify phase shift link theoretical gain, and verified by the unloaded little step of separate excitation;
Step 107: generator boosts near 70% rated voltage under separate excitation idle condition, is surveyed generator d-axis open circuit time constant by inversion field suppression admission generator voltage decline curve;
Step 108: generator carries out open loop and determines the test of angle step under the unloaded low saturated operating mode of separate excitation, produces exciter excitation voltage step signal, the change curve of admission exciter excitation voltage, exciting current of exciter;
Step 109: ignore generator and exciter saturation characteristic, set up 39 phase brushless exciters and generator electromechanical transient simplified model, input the step form consistent with determining exciter excitation voltage in angle step, obtain exciting current of exciter response characteristic, according to determining exciting current of exciter change measured curve in angle step, time domain identification is carried out to 39 phase brushless exciter constants idle time;
Step 110: under carrying out DCgenerator motor field system self-excitation mode, the unloaded large stepped characteristic of closed loop is surveyed, and calculates nuclear power excitation system export-restriction value;
Step 111: under carrying out the self-excitation mode of DCgenerator motor field system, the unloaded little step response of closed loop is surveyed, and test data is as judging the foundation whether modeling accuracy is qualified;
Step 112: the result of combination step 104, step 105, step 106, step 107, step 109 and step 110, forms complete nuclear power generating sets excitation system model parameter;
Step 113: set up nuclear power generating sets excitation system simulation example, simulation calculation is carried out to the measured data of step 111, result of calculation meet predetermined error criterion be qualified, if do not meet, then return step 104, check the error of the respective result of step 104, step 105, step 106, step 107, step 109 and step 110 with step 111 measured data successively, and adjust accordingly, until meet predetermined error criterion;
Step 114: gather identification of Model Parameters result, and preserve correlation computations check pilot process.
In embodiments of the present invention, in described step 106, separate excitation operating mode adopts the connecting line untied generator exciter energized circuit and excitation and become, use 50Hz 380V constant voltage source instead as controllable silicon B-power, exit regulator lead-lag link, putting PID is pure proportional-plus-integral link, unloaded little step method is adopted to measure per unit value and the step amount ratio of exciter excitation voltage variety before and after step, amplify the gain of phase shift link to power of controlled silicon to survey, avoid the impact of lead-lag link transient state gain inaccurate and controllable silicon anode voltage change on measured result.
In embodiments of the present invention, in described step 108, have employed the open loop of exciter excitation voltage when time domain identification is carried out to exciter constant idle time and determine angle step experimental technique and eliminate voltage close loop and control interference to exciting current of exciter response characteristic measurement process.
In embodiments of the present invention, in described step 109, during identification exciter constant idle time, generally under the low saturated operating mode of 70% specified set end voltage, exciter and generator field saturated comparatively light, generally can be similar to and get saturation coefficient is 0; Ignore 39 phase brushless exciter commutating reactances, the impact of commutating reactance is integrated into load current demagnetizing effect and gets on consideration, order is determined angle step realistic model and is greatly simplified.
Compared to prior art, the present invention has following beneficial effect: the invention provides the dynamo-electric transient Model of a kind of nuclear power generating sets 39 commutating phase brushless excitation system electric system and point link parameter actual-measurement modeling method, simulation accuracy greatly improves compared with typical excitation model parameter, and effectively avoids the many solutions problem in the many-valued parameter identification process of high-order control system.Therefore the present invention can directly apply in the dynamo-electric transient analysis of the electric system relevant to nuclear power generating sets excitation con-trol, has important engineer applied and is worth.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the actual-measurement modeling method of the dynamo-electric transient Model of nuclear power generating sets excitation system electric system of the present invention.
Fig. 2 is nuclear power generating sets 39 phase provided by the invention self-excitation brushless excitation system structural drawing.
Fig. 3 is nuclear power generating sets 39 phase provided by the invention self-excitation brushless excitation system illustraton of model.
Fig. 4 is nuclear power generating sets field regulator PID link frequency domain characteristic theory calculate provided by the invention and measured result comparison diagram.
Fig. 5 is that nuclear power generating sets excitation system power provided by the invention amplifies phase shift link GAIN TEST oscillogram.
Fig. 6 is the unloaded illustraton of model of the generator band exciter ignored in saturation effect and exciter commutating reactance situation provided by the invention.
Fig. 7 is that angle 10% step exciter excitation voltage-contrast design sketch is determined in nuclear power brushless exciter constant idle time provided by the invention test.
Fig. 8 is that angle 10% step exciting current of exciter contrast effect figure is determined in nuclear power brushless exciter constant idle time provided by the invention test.
Fig. 9 is unloaded+5% step set end voltage simulation curve of nuclear power generating sets provided by the invention self-excitation brushless excitation system closed loop and measured waveform contrast effect figure.
Figure 10 is unloaded+5% step exciter excitation voltage simulation curve of nuclear power generating sets provided by the invention self-excitation brushless excitation system closed loop and measured waveform contrast effect figure.
Figure 11 is unloaded-5% step set end voltage simulation curve of nuclear power generating sets provided by the invention self-excitation brushless excitation system closed loop and measured waveform contrast effect figure.
Figure 12 is unloaded-5% step exciter excitation voltage simulation curve of nuclear power generating sets provided by the invention self-excitation brushless excitation system closed loop and measured waveform contrast effect figure.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is specifically described.
As shown in Figure 1, the present invention proposes a kind of nuclear power generating sets 39 phase self-excitation brushless excitation system machine-electricity transient model actual-measurement modeling method, according to the design feature of nuclear power generating sets excitation system, abstract simplification the dynamo-electric transient calculation model of nuclear power generating sets excitation system electric system, then, carry out corresponding static state, dynamic test, test its each Link Model parameter, and check each partial model parameters precision by contrast measured result and the method for simulation result and whether meet Power System Analysis needs, the specific implementation process of the method is as follows
1) physical arrangement of the field regulator of input nucleus group of motors excitation system, three-phase controllable silicon power amplification unit, 39 phase brushless exciters and generator and design parameter, form excitation system initial model;
2) according to nuclear power excitation system initial model, analyze the identifiability of its model parameter, the parameter high to differentiability carries out actual measurement identification, and the parameter low to differentiability carries out matching identification;
3) in unit stationary state, set end voltage measurement links time constant Tr is comprised to field regulator model parameter, amplitude limit link carries out parameter actual measurement, spectral characteristic actual measurement is carried out to PID link logical organization and parameter;
4) identification is carried out according to the parameter of static measured data to field regulator pid parameter, set end voltage measurement links time constant Tr, amplitude limit link;
5) according to generator and exciter no load saturation characteristic calculating generator field voltage reference value, exciting current of exciter reference value, exciter excitation voltage reference value, generator and exciter saturation coefficient, calculate armature of exciter reaction demagnetization coefficient according to exciter load characteristic;
6) calculate power of controlled silicon according to Cosine Phase-shift principle and amplify phase shift link theoretical gain
, and verified by the unloaded little step of separate excitation;
7) generator boosts near 70% rated voltage under separate excitation idle condition, is surveyed generator d-axis open circuit time constant Td0 ' by inversion field suppression admission generator voltage decline curve;
8) generator carries out open loop and determine the test of angle step under the unloaded 70% specified set end voltage operating mode of separate excitation, produces exciter excitation voltage step signal, enrolls the change curve of exciter excitation voltage, exciting current of exciter;
9) generator and exciter saturation characteristic is ignored, set up 39 phase brushless exciters and generator electromechanical transient simplified model, input the step form consistent with determining exciter excitation voltage in angle step, obtain exciting current of exciter response characteristic, according to determining exciting current of exciter change measured curve in angle step, to 39 phase brushless exciter constants idle time
carry out time domain identification;
10) under carrying out DCgenerator motor field system self-excitation mode, the unloaded large stepped characteristic of closed loop is surveyed, and calculates nuclear power excitation system export-restriction value;
11) under carrying out the self-excitation mode of DCgenerator motor field system, the unloaded little step response of closed loop is surveyed, and test data is as judging the foundation whether modeling accuracy is qualified;
12) combine 4), 5), 6), 7), 9) and 10) result, form complete nuclear power generating sets excitation system model parameter;
13) nuclear power generating sets excitation system simulation example is set up, to 11) measured data carry out simulation calculation, result of calculation meet predetermined error criterion be qualified, if do not meet, then return step 4), check 4 successively with step 10) measured data), 5), 6), 7), 9) and 10) error of respective result, and do and suitably adjust mutually, until meet predetermined error criterion;
14) gather excitation system identification of Model Parameters result, and preserve correlation computations check pilot process.
Embodiment
For the typical nuclear power generating sets poly phase rectification self-excitation brushless excitation system shown in Fig. 2, the present invention is further described in detail below, but the invention is not restricted to given example.
Use method provided by the invention to carry out actual measurement modeling to the dynamo-electric transient Model of nuclear power generating sets excitation system electric system, step is as follows:
Whether step one: according to field regulator and generator data, check its equipment and the model of Fig. 3 can be adopted to represent, if there is difference, then carry out corresponding modify;
Step 2: carry out model parameter actual measurement to field regulator under static state, can adopt typical time domain identification method or frequency domain identification method.Regulator pid parameter arranges lower overall frequency domain characteristic theory calculate and measured result to such as Fig. 4 in operation;
Step 3: according to generator and exciter no load saturation characteristic calculating generator field voltage reference value, exciting current of exciter reference value, exciter excitation voltage reference value, generator and exciter saturation coefficient
s e, calculate armature of exciter reaction demagnetization coefficient according to exciter load characteristic
k d;
Step 4: exit lead-lag link, puts regulator parameter grv1=6.9, trv1=trv3=1s, trv2=5s, carries out the unloaded little step test of separate excitation, as Fig. 5.The per unit value and the step amount ratio that measure exciter excitation voltage variety before and after step are excitation system open loop full gain, removing proportional gain
be the gain of power amplification phase shift link
;
Step 5: generator boosts near 70% rated voltage under separate excitation idle condition, by inversion field suppression admission generator voltage decline curve, the time interval of getting when set end voltage drops to 0.368 times of initial value is generator d-axis open circuit time constant Td0 ';
Step 6: generator carries out open loop and determines the test of angle step under the unloaded 70% specified set end voltage of separate excitation, produces exciter excitation voltage step signal, the change curve of admission exciter excitation voltage, exciting current of exciter.Ignore generator and exciter saturation characteristic, set up the unloaded simplified model of generator band 39 phase brushless exciter as Fig. 6, inputting the step form consistent with determining exciter excitation voltage in angle step as Fig. 7, adopting time domain identification technique to obtain
t e during=0.428s, exciting current of exciter simulated properties and measured curve are the most close, as Fig. 8.This 0.428 s is exciter constant idle time
t e identifier.
Step 7: obtain nuclear power generating sets 39 phase self-excitation brushless excitation system overall model parameter according to identification result combination, carry out emulation and the actual measurement contrast of closed test, unit set end voltage and exciter excitation voltage emulate with actual measurement comparing result as shown in Fig. 9-Figure 12.Both characteristics visible are basically identical, and the correctness of nuclear power generating sets excitation system identification of Model Parameters result is described.
Finally should be noted that: with above-mentioned Alstom 39 phase self-excitation brushless excitation system electromechanical transient modeling embodiments only in order to illustrate that technical scheme of the present invention is not intended to limit at 39 phase brushless excitation units.Although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Be more than preferred embodiment of the present invention, all changes done according to technical solution of the present invention, when the function produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (5)
1. a nuclear power generating sets 39 phase self-excitation brushless excitation system machine-electricity transient model actual-measurement modeling method, it is characterized in that: according to the design feature of nuclear power generating sets 39 phase self-excitation brushless excitation system, abstract simplification nuclear power generating sets excitation system electromechanical transient stability Calculation model, then carry out corresponding static state, dynamic test, test its each point of Link Model parameter, and check each Link Model parameters precision by contrast measured result and the method for simulation result and whether meet Power System Analysis needs.
2. nuclear power generating sets 39 phase self-excitation brushless excitation system machine-electricity transient model actual-measurement modeling method according to claim 1, is characterized in that: specifically comprise the steps,
Step 101: the physical arrangement of field regulator, three-phase controllable silicon power amplification unit, 39 phase brushless exciters and generator and design parameter in input nucleus group of motors excitation system, form excitation system initial model;
Step 102: according to excitation system initial model, analyzes the identifiability of its model parameter, and the parameter high to differentiability carries out actual measurement identification, and the parameter low to differentiability carries out matching identification;
Step 103: in unit stationary state, comprises set end voltage measurement links time constant Tr to field regulator model parameter, amplitude limit link carries out parameter actual measurement, carry out spectral characteristic test to PID link logical organization and parameter;
Step 104: carry out identification according to the parameter of static measured data to field regulator pid parameter, set end voltage measurement links time constant Tr, amplitude limit link;
Step 105: according to generator and exciter no load saturation characteristic calculating generator field voltage reference value, exciting current of exciter reference value, exciter excitation voltage reference value, generator and exciter saturation coefficient, calculates armature of exciter reaction demagnetization coefficient according to exciter load characteristic;
Step 106: calculate power of controlled silicon according to Cosine Phase-shift principle and amplify phase shift link theoretical gain, and verified by the unloaded little step of separate excitation;
Step 107: generator boosts near 70% rated voltage under separate excitation idle condition, is surveyed generator d-axis open circuit time constant by inversion field suppression admission generator voltage decline curve;
Step 108: generator carries out open loop and determines the test of angle step under the unloaded low saturated operating mode of separate excitation, produces exciter excitation voltage step signal, the change curve of admission exciter excitation voltage, exciting current of exciter;
Step 109: ignore generator and exciter saturation characteristic, set up 39 phase brushless exciters and generator electromechanical transient simplified model, input the step form consistent with determining exciter excitation voltage in angle step, obtain exciting current of exciter response characteristic, according to determining exciting current of exciter change measured curve in angle step, time domain identification is carried out to 39 phase brushless exciter constants idle time;
Step 110: under carrying out DCgenerator motor field system self-excitation mode, the unloaded large stepped characteristic of closed loop is surveyed, and calculates nuclear power excitation system export-restriction value;
Step 111: under carrying out the self-excitation mode of DCgenerator motor field system, the unloaded little step response of closed loop is surveyed, and test data is as judging the foundation whether modeling accuracy is qualified;
Step 112: the result of combination step 104, step 105, step 106, step 107, step 109 and step 110, forms complete nuclear power generating sets excitation system model parameter;
Step 113: set up nuclear power generating sets excitation system simulation example, simulation calculation is carried out to the measured data of step 111, result of calculation meet predetermined error criterion be qualified, if do not meet, then return step 104, check the error of the respective result of step 104, step 105, step 106, step 107, step 109 and step 110 with step 111 measured data successively, and adjust accordingly, until meet predetermined error criterion;
Step 114: gather identification of Model Parameters result, and preserve correlation computations check pilot process.
3. nuclear power generating sets 39 phase self-excitation brushless excitation system machine-electricity transient model actual-measurement modeling method according to claim 2, it is characterized in that: in described step 106, separate excitation operating mode adopts the connecting line untied generator exciter energized circuit and excitation and become, use 50Hz 380V constant voltage source instead as controllable silicon B-power, exit regulator lead-lag link, putting PID is pure proportional-plus-integral link, unloaded little step method is adopted to measure per unit value and the step amount ratio of exciter excitation voltage variety before and after step, amplify the gain of phase shift link to power of controlled silicon to survey, avoid the impact of lead-lag link transient state gain inaccurate and controllable silicon anode voltage change on measured result.
4. nuclear power generating sets 39 phase self-excitation brushless excitation system machine-electricity transient model actual-measurement modeling method according to claim 3, it is characterized in that: in described step 108, have employed the open loop of exciter excitation voltage when time domain identification is carried out to exciter constant idle time and determine angle step experimental technique and eliminate voltage close loop and control interference to exciting current of exciter response characteristic measurement process.
5. nuclear power generating sets 39 phase self-excitation brushless excitation system machine-electricity transient model actual-measurement modeling method according to claim 4, it is characterized in that: in described step 109, during identification exciter constant idle time, general under the low saturated operating mode of 70% specified set end voltage, exciter and generator field saturated comparatively light, generally can be similar to and get saturation coefficient is 0; Ignore 39 phase brushless exciter commutating reactances, the impact of commutating reactance is integrated into load current demagnetizing effect and gets on consideration, order is determined angle step realistic model and is greatly simplified.
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