CN103901875A - Load change actual increasing and decreasing rate calculating method for generator unit AGC test - Google Patents

Abstract

The invention relates to a load change actual increasing and decreasing rate calculating method for a generator unit AGC test. The method comprises the steps that (1) a unit load Q1 obtained after the actual load value exceeds an instruction within +/-1 % Pe is selected as a start point load of a change, and the specific time T1 when the change occurs is recorded at the same time; (2) a unit load Q2 obtained after the actual load value reaches the instrument within +/-1% Pe is selected as a terminal point load of the change, and the specific time T2 when the change occurs is recorded at the same time; (3) the actual change rate V=(Q2-Q1)/(T2-T1) is calculated; (4) if the unit grinding start stage or the unit grinding stop stage of the load change process is passed, the time T3 when the unit is in the start/stop grinding load point within +/-1% Pe is recorded, the time T4 when the unit is not in the start/stop grinding load point within +/-1% Pe is recorded, and the change rate is changed into V=(Q2-Q1)/(T2-T1-T4+T3). According to the load change actual increasing and decreasing rate calculating method for the generator unit AGC test, by means of determination of the most reasonable start point and the terminal point of the load change, whether the AGC test is up to standard or not is accurately judged.

Description

The method of the actual elevation rate of load variations in genset AGC test

Technical field

The invention belongs to Automatic Generation Control technical field technical field, the method for the actual elevation rate of load variations in especially a kind of genset AGC test.

Background technology

At present according to grid-connected administrative provisions and safety evaluatio file, ensure electricity net safety stable reliability service, carry out the control of interconnection power and frequency control, need to carry out genset AGC(Automatic Generation Control according to the time between overhauls(TBO) of each power plant) performance test, pilot project is mainly as follows: Load Regulation speed, degree of regulation and response time.Three variablees calculate independent but interact.

The definition of index, regulations speed refers to the speed that in a period of time, unit active power changes, load instruction changes, just carry out regulations speed calculating, each speed of calculated load instruction changes phase, if instruction does not change, do not calculate, if opening mill point, reject and open the time that mill point consumes.

Open mill point and refer to, start the time period of coal pulverizer, can be compared to automobile lifting shelves the same, during to certain generation load, will change the number of units of moving coal pulverizer, generally need about 10 minutes.

At present, in various files specify, as " region, North China generate electricity by way of merging two or more grid systems factory's assistant service management implementation detailed rules and regulations " adopts said method regulation to regulations speed, but in actual computation, whether specifically note load variations starting point and destination node, so each computing method will draw different conclusions, especially in the time judging raising speed rate whether qualified, the difference of account form, access time, the difference of point will produce near the small deviation of qualified criterion, it is qualified causing underproof rate calculations, and qualified being calculated as is defective.By retrieval, do not retrieve pertinent literature and the patent content of the method solving the problems of the technologies described above in this technical field at present.

Summary of the invention

The object of the invention is for the deficiencies in the prior art, and propose the method for the actual elevation rate of load variations in a kind of genset AGC test.

The present invention solves its technical matters and takes following technical scheme to realize:

A method for the actual elevation rate of load variations in genset AGC test, comprises that step is as follows:

(1) choose the starting point of load variations, i.e., after unit load instruction changes, actual load value exceeds after instruction ± 1%Pe, and the unit load Q1 in this moment is the point load that rises changing, and records the concrete moment T1 that changes simultaneously;

(2) choose the terminal of load variations, i.e., after unit load instruction stops changing, after actual load entry instruction ± 1%Pe, the unit load Q2 in this moment is the terminal load changing, and records the concrete moment T2 that changes simultaneously;

(3) calculate actual rate: V=(Q2-Q1)/(T2-T1);

(4) if having passed through unit, load alternation process opens the mill stage, or stop the mill stage, record unit and enter and open/stop the time T 3 of grinding load point ± 1%Pe, record leaves the T4 of start and stop mill load point ± 1%Pe, and rate of change is changed to: V=(Q2-Q1)/(T2-T1-T4+T3).

Advantage of the present invention and good effect are:

1, can be according to this method, find the most rational starting point of each load variations and terminal;

2, utilize starting point and terminal, accurately calculate each speed during AGC tests central load variations;

3, according to each speed, no matter calculate mean speed or minimum-rate, can judge whether AGC test is qualified as raw data.

Brief description of the drawings

Fig. 1 is the starting point of load variations and the schematic diagram of evaluation of end point in the inventive method;

Fig. 2 is that in the inventive method, unit opens the mill stage, and stops the timing schematic diagram in the stage of grinding;

Fig. 3 is the starting point of load variations and the schematic diagram of evaluation of end point in example of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the invention process is further described, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.

A method for the actual elevation rate of load variations in genset AGC test, as shown in Figure 1, method step is as follows:

(1) choose the starting point of load variations, i.e., after unit load instruction changes, actual load value exceeds after instruction ± 1%Pe, and this moment is the starting point Q1 that unit load changes, and records the concrete moment T1 that changes simultaneously; Wherein, choose load variations starting point Q1 according to being:

First we establish A, B 2 points, A point refers to, the moment that load instruction changes, B point refers to, after load instruction changes, actual load in load instruction change direction for the first time by the moment of former load instruction, if actual load and former load instruction do not have intersection point in load instruction change direction, get the intersection point place of last actual load and former load instruction.

As shown in Figure 1, if choose A point or B point as zequin, will conflict mutually with another index " response time ", after response time refers to that system is sent instruction, unit load former go out on the basis in force, step out reliably the adjusting dead band used time consistent with regulating direction.Regulate dead band to get 1%Pe, the rated power of the unit that Pe refers to, general response time starting point is chosen A point, and end point is T1 place.Reason one: the starting point of rate of load change is chosen to A point or B point because A point or B point also former go out within the dead band in force, do not step out dead band, thus think that this adjustment does not also have substantial progress, so should not select A point or B point.Two: three indexs of reason, response time, regulations speed, degree of regulation are interactional three amounts, choosing the response time should not affect the calculating of regulations speed, between their two variablees, it should be the mutual linking of time point, so it is very rational starting point being chosen to T1 from this aspect, and chose A point or B point is irrational in the past;

(2) choose the terminal of load variations, i.e., after unit load instruction stops changing, after actual load entry instruction ± 1%Pe, this moment is the terminal Q2 that unit load changes, and records the concrete moment T2 that changes simultaneously; Wherein, choose load variations terminal Q2 according to being:

First we establish C, D 2 points, C point refers to, actual load produces intersection point for the first time according to load instruction change direction moment with new load instruction, D point refers to, after load instruction changes, actual load reaches the moment of first peak value after load instruction change direction is for the first time by new load instruction.

If choose C point or D point as rate calculations terminal, will conflict mutually with the calculating of static deviation, static deviation refers to unit operation unit actual load and load deviation between instruction in the time of steady-state process.Steady-state process starting point refers to after unit instruction variation, changes to new instruction by former instruction, and unit actual load enters into the dead zone range of the new instruction of unit.And the terminal of steady-state process refers to the moment that unit instruction changes next time.If the relation between steady-state process and response time, regulations speed calculation stages, it should be an organic process overlapping, reason one: if choose C point or the D point terminal as rate calculations, because C point, D point have entered steady-state process, should there is no direct relation with lift adjustment process, but unit is in around the new instruction stable operation of unit.Reason two: if choose C point, D point as terminal, conflict mutually with the calculation stages of steady-state deviation.So the end point of calculating AGC speed is chosen should be at T2;

(3) calculate actual rate: V=(Q2-Q1)/(T2-T1);

(4) as shown in Figure 2, if this process has been passed through unit and opened the mill stage, or stop the mill stage, record unit and enter and open/stop the time T 3 of grinding load point ± 1%Pe, record leaves the T4 of start and stop mill load point ± 1%Pe, and rate of change is changed to: V=(Q2-Q1)/(T2-T1-T4+T3).

Example 1

Certain power plant's AGC process of the test is described below:

Unit rated capacity 330MW, testing standard: it is 6.6MW/min that regulations speed is not less than 2%Pe.

On 06 11st, 2012, three coal pulverizer operations, referring to Fig. 3, 11:25:46 is at A point, load instruction is made as 220MW by 165MW, main vapour pressure 14.54MPa, load changing rate is set as 7MW/min, 11:26:01 actual load arrives B point, leave 1% dead band T1 point to 11:26:06 actual load, 11:34:26 arrives T2 point, 11:34:30 actual load arrives C point, and to the time of peaking D be 11:35:02, if choose A point or B point according to starting point, terminal is chosen T2, the result of computation rate is 6.35MW/min, 6.53MW/min, be starting point and choose T1, and C point, D point is terminal, speed is respectively 6.55MW/min, 6.15MW/min, standard 6.6MW/min according to the rules, if access time, point was not right, speed does not reach requirement, thereby can not obtain AGC and drop into license.

According to the AGC test period standard that is month, if this defective next stand the test, at least the loss of the electricity price of this month is calculated according to following formula: taking 330MW unit as example, monthly the unit generation time was according to 500 hours, 0.001 yuan/kilowatt hour of the electric price difference of every degree, result is 0.001 yuan/kilowatt hour=165000 yuan of 500 hours * 330*1000 kilowatt hour *.Bring approximately more than 160,000 yuan of direct economic loss.

Claims (1)

1. a method for the actual elevation rate of load variations in genset AGC test, is characterized in that comprising that step is as follows:

(1) choose the starting point of load variations, i.e., after unit load instruction changes, actual load value exceeds after instruction ± 1%Pe, and the unit load Q1 in this moment is the point load that rises changing, and records the concrete moment T1 that changes simultaneously;

(2) choose the terminal of load variations, i.e., after unit load instruction stops changing, after actual load entry instruction ± 1%Pe, the unit load Q2 in this moment is the terminal load changing, and records the concrete moment T2 that changes simultaneously;

(3) calculate actual rate: V=(Q2-Q1)/(T2-T1);

(4) if having passed through unit, load alternation process opens the mill stage, or stop the mill stage, record unit and enter and open/stop the time T 3 of grinding load point ± 1%Pe, record leaves the T4 of start and stop mill load point ± 1%Pe, and rate of change is changed to: V=(Q2-Q1)/(T2-T1-T4+T3).

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