CN102611124A - Primary frequency regulation control method applicable to thermal generator set of intelligent power grid - Google Patents
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Abstract
The invention discloses a primary frequency regulation control method applicable to a thermal regulator set of an intelligent power grid. By the aid of the primary frequency regulation control method, frequency regulation performances of the set are effectively improved, stability of primary frequency regulation action is maintained, and frequency fluctuation of a system is reduced. The primary frequency regulation control method applicable to the thermal generator set of the intelligent power grid includes that a primary frequency regulation power compensation value multiplies a modification function to be corrected, the modification function consists of correction factors for characteristics including front pressure, rated pressure and valve flow, real-time computation is carried out by the aid of the modification function according to a state of the set when primary frequency regulation is not actuated, a back switching block generates a self-holding loop after the primary frequency regulation action, state parameters of the set during the primary frequency regulation action are kept, the modification function keeps unchanged, certain swinging of load is avoided, and stability of the primary frequency regulation action is maintained.
Description
Technical field
The present invention relates to adapt to the thermal power generation unit primary frequency modulation control method of intelligent grid.
Background technology
Along with new forms of energy are incorporated into the power networks, the continuous increase of load growth and scale of power; Under the new situation interconnected at extra-high voltage grid and large regional grid; Grid contacts at different levels are day by day tight; The requirement of cooperation is also increasingly high between electrical network and the unit, and the primary frequency modulation in the net factory coordination function becomes one of effective means of stablizing in electrical network.The generating set primary frequency regulation function is the intrinsic function of turbo generator set; Mainly be through regulating the admission adjustment doors of DEH system, utilize boiler heat storage, occurring under the unusual situation at electrical network; The requirement of responsive electricity grid fast; Electric power grid frequency stabilization to remedy the network load gap, is kept the safety of electrical network.
The controlled function framework of unit primary frequency modulation is a kind of poor linear regulation that simply has basically; I.e. specification requirement according to the associated documents that are incorporated into the power networks is provided with corresponding frequency modulation amount static function in load control logic; And reckon without the variation of fired power generating unit in the dynamic characteristic and the operational factor of running; Existing primary frequency modulation control strategy does not fully take into account the unit different parameters consistency of the responding ability of frequency modulation next time; Cause the primary frequency modulation response amplitude not enough or regulate excessively, main cause is that the amplitude of variation of primary frequency modulation is a response under the nominal parameter of unit, but in actual moving process; Receive the influence of unit operation parameter, operational mode and boiler operatiopn state, cause the preceding pressure of machine not reach corresponding requirement; DEH pitch flow nonlinear characteristic often makes the people ignore to the influence of unit primary frequency modulation performance in addition; Many units in the net since fail standard, regularly the valve flow compensated curve of adjusting causes the steam turbine pitch in different opening; The generating set frequency modulation performance demonstrates stronger non-linear; Incremental speed governor droop will change accordingly, makes the actual act amplitude adjusted of primary frequency modulation perhaps produce overshoot inadequately, is difficult to take into account the primary frequency modulation ability of load global extent.
Summary of the invention
The object of the invention provides a kind of thermal power generation unit primary frequency modulation control method that adapts to intelligent grid exactly for addressing the above problem, and it can effectively improve the performance of unit frequency modulation, keeps the stability of primary frequency modulation action, has reduced the power system frequency fluctuation.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
The thermal power generation unit primary frequency modulation control method that adapts to intelligent grid, primary frequency modulation power back-off amount adopts and correction function multiplies each other revises, and correction function is a function of being made up of pressure, rated pressure and valve flow characteristic correction factor before the machine; When primary frequency modulation is failure to actuate; Correction function calculates according to the state of unit in real time, and after the primary frequency modulation action, the handoff block of back produces a self-holding circuit; State parameter when keeping the action of unit primary frequency modulation; Keep correction function constant, avoiding loading produces certain swing, keeps the stability of primary frequency modulation action.
Said makeover process employing correction function f (x1, x2),
ρ wherein: the valve flow characteristic correction factor,
X1: pressure before the machine is a process variables;
X2: the rated pressure of unit, the rated pressure of different units is different;
δ
i: the speed governor droop of load i section;
δ
N: the rated speed diversity factor.
F (x1; X2) be to propose on the basis of repeatedly theoretical research and lot of test; Have the preciseness of science and the pragmatic property of practice, in the primary frequency modulation function of unit, obtained checking and approval, for the frequency difference of compensation network with keep the stable of electrical network and have great importance.
Through revised primary frequency modulation power back-off amount, process amplitude limiter, handoff block are delivered to and are delivered to each valve characteristic curve, the action of regulating and controlling valve after adder is handled.
The present invention to the correction of primary frequency modulation function for the primary frequency modulation function technical research of going deep into unit, the performance of improving the primary frequency modulation of unit has great importance.
Engineering test
Several performance parameters that primary frequency modulation is main: [national grid section (2011) " thermal power generation unit primary frequency modulation test guide rule "]
1 frequency modulation dead band
Unit is participated in the primary frequency modulation dead band and should be not more than | ± 0.033|Hz or | ± 2|r/min.
2 dynamic indicators
2.1 unit is participated in the response time of primary frequency modulation should be less than 3s.
2.2 unit is participated in the stabilization time of primary frequency modulation should be less than 1min.
2.3 the load responding speed of unit primary frequency modulation should satisfy: the time that coal-fired unit reaches 75% target load should be not more than 15s, and the time that reaches 90% target load should be not more than 30s, and the time that the combustion gas unit reaches 90% target load should be not more than 15s.
3 units are participated in the load variations amplitude of primary frequency modulation
3.1 the fired power generating unit of 250MW＞Po, limited amplitude >=10%Po;
3.2 the fired power generating unit of 350MW >=Po >=250MW, limited amplitude >=8%Po;
3.3 the fired power generating unit of 500MW >=Po＞350MW, limited amplitude >=7%Po;
3.4 the fired power generating unit of Po＞500MW, limited amplitude >=6%Po.
Process of the test and data:
The operating mode of primary frequency modulation test is a lot; And be that the corresponding testing site of each operating mode has three; As space is limited, we have chosen the general operational mode-coordination mode of present unit, and the testing site is selected in 75% load point place; So test is carried out under the CCS+DEH mode, and the prioritization scheme that has adopted this paper to propose.The subjects Subcritical Units; Rated output 330MW, senior middle school's pressing cylinder, resuperheat twin-cylinder double flow condensing turbine; High intermediate pressure cylinder adopts and closes the anti-flow structure of cylinder; Low pressure (LP) cylinder adopts double-deck flow dividing structure, and steam turbine has eight grades of non-adjustment regenerative steams, and the rated speed of steam turbine is 3000r/min.
The speed governor droop of machine settings is 5%, when slip is 12r/min (frequency difference is 0.2Hz), disregards the frequency modulation dead band, power back-off amount Δ P=26.4MW.
The load point of selection 75% makes an experiment, and test data sheet is following:
Reduction of Students' Study Load lotus conditional curve such as Fig. 2 (cursor was located in action in 3 seconds), data such as table 1.
Table 1: primary frequency modulation Reduction of Students' Study Load lotus process testing data (slip comprises the dead band)
| Parameter | Before the test | After the |
After the disturbance 15 seconds | After the disturbance 30 seconds | Unit |
| Speed discrepancy (n-n O) | -2 | 14 | 14 | 14 | r/min |
| Unit load | 253.127 | 250.979 | 230.212 | 221.644 | MW |
| The pitch stroke | 17.564 | 15.819 | 15.716 | 15.460 | ％ |
| Main vapour pressure | 16.450 | 16.608 | 16.827 | 17.030 | MPa |
| Main stripping temperature | 539.329 | 539.329 | 539.329 | 539.559 | ℃ |
| Steam water-level | -17.257 | -20.974 | -46.041 | -73.121 | mm |
| Furnace pressure | -92.511 | -69.909 | -84.749 | -132.939 | Pa |
| Vacuum | 94.927 | 94.927 | 94.927 | 95.034 | kpa |
From Fig. 2, can find out with table 1, in the primary frequency modulation course of action, be the requirement that static index, dynamic indicator or load variations amplitude all satisfy performance index, result of calculation such as following table 2 (slip, frequency difference comprise the dead band).
Performance index result of calculation (slip comprises the dead band) in the table 2 primary frequency modulation Reduction of Students' Study Load lotus process
Load up conditional curve such as Fig. 3 (cursor was located in action in 30 seconds), data such as following table 3.
Table 3: load up process testing data (slip comprises the dead band)
| Parameter | Before the test | After the |
After the disturbance 15 seconds | After the disturbance 30 seconds | Unit |
| Speed discrepancy (n-n O) | 1 | -14 | -14 | -14 | r/min |
| Unit load | 221.198 | 223.998 | 242.660 | 247.174 | MW |
| The pitch stroke | 17.474 | 18.756 | 19.098 | 19.161 | ％ |
| Main vapour pressure | 14.848 | 14.736 | 14.508 | 14.393 | MPa |
| Main stripping temperature | 531.463 | 531.415 | 530.944 | 530.372 | ℃ |
| Steam water-level | 1.131 | -0.079 | 18.877 | 41.200 | mm |
| Furnace pressure | -59.515 | -53.701 | 9.097 | 86.172 | Pa |
| Vacuum | 91.601 | 91.601 | 91.601 | 91.601 | kpa |
Can find out from Fig. 3 and table 3, in the primary frequency modulation course of action, be the requirement that static index, dynamic indicator or load variations amplitude all satisfy performance index.Result of calculation such as following table 4 (slip, frequency difference comprise the dead band):
Table 4 primary frequency modulation action load up process result of calculation (slip comprises the dead band)
The invention has the beneficial effects as follows:
1, the be incorporated into the power networks quality of primary frequency modulation performance of unit directly influence the stable of mains frequency, through function correction primary frequency modulation movement range, keeps stablizing of mains frequency, for the safe and stable operation of intelligent grid provides technical support.
2, improve the control precision of unit primary frequency modulation, avoid producing some unnecessary disturbances, keep the economic security operation of unit.
3, frequency is the important indicator of the quality of power supply, and the stabilization energy of the frequency of electrical network improves users' the electric equipment and the safe and effective operation of power equipment.
Description of drawings
Fig. 1 is that figure is regulated in improvement of the present invention.
Fig. 2 is the real-time curve of each parameter in the primary frequency modulation Reduction of Students' Study Load lotus process.
Fig. 3 is the real-time curve of each parameter in the primary frequency modulation load up process.
Wherein, 1, multiplier 2, handoff block 3, amplitude limiter 4, adder 5, switch 6, correction function 7, condenser vacuum 8, boiler export temperature 9, tachometer value 10, main vapour pressure 11, unit load 12, steam water-level 13, combustion chamber draft 14, pitch valve position feedback.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Among Fig. 1; The thermal power generation unit primary frequency modulation control method that adapts to intelligent grid; When mains frequency was unstable, system can calculate primary frequency modulation power back-off amount Δ P (the load compensation amount is by machine set type and the decision of unit capacity size, and fixing standard is arranged) according to frequency departure; (x1, the numerical value that x2) calculates this moment does function f simultaneously
(p1 is the preceding force value of the machine of this moment, p
NThe rated pressure of unit for this reason, ρ is the flow correction coefficient of unit for this reason) because primary frequency modulation action this moment, switch 5 produces self-sustainings, can keep present numerical value
Constant during this primary frequency modulation action.The power back-off amount is Δ P and correction function f (x1; X2) multiply each other; The interval that obtains
amplitude limiter is [μ; μ]; μ is the amplitude peak of the unit primary frequency modulation action of a constant volume; Under the normal condition;
(amplitude limiter plays the protective effect under the abnormal conditions);
sends into handoff block 2 behind amplitude limiter; Under the situation that the primary frequency modulation input satisfies condition, handoff block 2 is sent to data
in the adder, and with the addition of comprehensive valve bit instruction after deliver to each valve characteristic curve; The demand of network load is satisfied in the action of regulating and controlling valve.
Employing correction function f during correction (x1, x2),
ρ wherein: the valve flow characteristic correction factor,
X1: pressure before the machine is a process variables;
X2: the rated pressure of unit, different unit rated pressures is different;
δ
i: the speed governor droop of load i section;
δ
N: the rated speed diversity factor.
Claims (1)
1. adapt to the thermal power generation unit primary frequency modulation control method of intelligent grid, primary frequency modulation power back-off amount adopts and correction function multiplies each other revises, and correction function is a function of being made up of pressure, rated pressure and valve flow characteristic correction factor before the machine; When primary frequency modulation is failure to actuate; Correction function calculates according to the state of unit in real time, and after the primary frequency modulation action, the handoff block of back produces a self-holding circuit; State parameter when keeping the action of unit primary frequency modulation; Keep correction function constant, avoiding loading produces certain swing, keeps the stability of primary frequency modulation action; Wherein said correction function be f (x1, x2),
ρ wherein: the valve flow characteristic correction factor,
X1: pressure before the machine is a process variables;
X2: the rated pressure of unit, different unit rated pressures is different;
δ
i: the speed governor droop of load i section;
δ
N: the rated speed diversity factor.
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| CN103147804A (en) * | 2013-02-20 | 2013-06-12 | 哈尔滨汽轮机厂有限责任公司 | One-step frequency modulation control method for steam turbine |
| CN103545840A (en) * | 2013-10-23 | 2014-01-29 | 国家电网公司 | Method capable of guaranteeing primary frequency modulation action effectiveness of 300MW generator set |
| CN103779862A (en) * | 2014-02-12 | 2014-05-07 | 国家电网公司 | Primary frequency modulation regulating system and method under unit plant TF |
| CN104052072A (en) * | 2014-05-27 | 2014-09-17 | 国家电网公司 | Thermal power generating unit primary frequency modulation optimal control method and system based on amplitude keeping |
| CN104779618A (en) * | 2015-04-29 | 2015-07-15 | 酒泉钢铁(集团)有限责任公司 | Coordination control method for generator sets in large power supply to large load direct power supply system |
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