CN108227501B - Compensation method for load control static deviation of thermal power generating unit - Google Patents

Compensation method for load control static deviation of thermal power generating unit Download PDF

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CN108227501B
CN108227501B CN201810038193.8A CN201810038193A CN108227501B CN 108227501 B CN108227501 B CN 108227501B CN 201810038193 A CN201810038193 A CN 201810038193A CN 108227501 B CN108227501 B CN 108227501B
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陆海
苏适
罗恩博
杨洋
严玉廷
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
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Abstract

The application discloses a compensation method for load control static deviation of a thermal power unit, wherein a static deviation compensation loop interface is added in a load control loop of the thermal power unit, and the calculation process of the load compensation quantity comprises the steps of obtaining a main steam pressure rated value P of the thermal power unitT0Load variation set value RsetCompensating coefficient K and detecting current main steam pressure operation value P of thermal power generating unitT(i)(ii) a According to a calculation formula
Figure DDA0001548639880000011
Calculating the load compensation LC. The method for compensating the static deviation of the load control of the thermal power generating unit provided by the application is characterized in that the load compensation quantity L is addedCCompensating the load command value Lset(i)With the actual value of the load LR(i)The deviation between the thermal power generating units provides a powerful guarantee for improving the load control rapidity and the load control precision of thermal power generating unit scheduling by a power grid, and simultaneously provides a powerful support for improving the AGC and primary frequency modulation assessment indexes of a power plant.

Description

Compensation method for load control static deviation of thermal power generating unit
Technical Field
The application relates to the technical field of thermal automatic control of thermal power plants, in particular to a compensation method for load control static deviation of a thermal power unit.
Background
In recent years, with the rapid development of grid-connected power generation of new energy such as wind power and photovoltaic, the power generation proportion of the new energy in a power grid is continuously increased, and the fluctuation of the new energy forms a greater challenge to power scheduling. At present, in order to compensate fluctuation of new energy generated in power generation and improve the acceptance capacity of a power grid to the new energy, a common solution is to improve the load control capacity of the power grid to a thermal power generating unit.
Fig. 1 is a schematic diagram of a load control loop of a conventional power grid to a thermal power generating unit, and as shown in fig. 1, a load control process of the power grid to the thermal power generating unit includes acquiring an AGC instruction of the unit, a primary frequency modulation amount and a unit load; selecting a switching processor T for a unit AGC instruction or a local unit instruction set value IA, and passing the processed value through a rate limiting processor LIMITER; superposing the value subjected to the rate limiting processing with the primary frequency modulation amount, and inputting the superposed value into a unit power regulation controller as a set value SP of the unit power regulation controller; the load of the unit passes through a FILTER FILTER, and the processed value is used as a measured value PV of the unit power regulation controller and is input into the unit power regulation controller; and the unit power regulation controller performs proportional, integral and differential control operation on the difference between the input set value SP and the input measured value PV, and outputs the operated result to the steam turbine DEH for control.
However, in the process of controlling the load of the thermal power generating unit by the power grid, especially when the thermal power generating unit is in high load variation, a large static deviation exists between the actual load generated by the thermal power generating unit and the load instruction of the power grid. In addition, in an actual power grid, a plurality of thermal power generating units often perform load fluctuation simultaneously, static deviations generated by the plurality of thermal power generating units are overlapped, the static deviation between the actual load of the thermal power generating units and a load instruction of the power grid is further increased, and Control and evaluation indexes of power dispatching on Automatic Generation Control (AGC) and primary frequency modulation of the thermal power generating units are further influenced.
Disclosure of Invention
The application provides a compensation method for load control static deviation of a thermal power unit, and aims to solve the problem that in a higher load change process, a larger static deviation exists between an actual load generated by the thermal power unit and a load instruction of a power grid in the prior art.
The application provides a compensation method for load control static deviation of a thermal power generating unit, which comprises the steps of additionally arranging a static deviation compensation loop interface in a load control loop of the thermal power generating unit, wherein the static deviation compensation loop interface is used for calculating a load compensation quantity, the calculation process of the load compensation quantity comprises the following steps,
obtaining main steam pressure rated value P of thermal power generating unitT0Load variation set value RsetCompensating coefficient K and detecting current main steam pressure operation value P of thermal power generating unitT(i)；
According to a calculation formula
Figure BDA0001548639860000011
Calculating the load compensation LC。
Preferably, the process of obtaining the compensation coefficient K includes,
obtaining the current load instruction value L of the power grid in the load changeset(i)The actual load value L is compared with the current load actual value L of the thermal power generating unitR(i)And according to a calculation formula
Figure BDA0001548639860000012
Calculating a load deviation delta L;
detecting current main steam pressure operation value P of thermal power generating unitT(i)；
According to a calculation formula
Figure BDA0001548639860000021
And calculating a compensation coefficient K.
Preferably, after calculating the compensation coefficient K, the method further includes determining whether the compensation coefficient K can compensate for a static deviation in the load variation of the thermal power generating unit, specifically including,
applying the calculated compensation coefficient K to the compensation quantity L for calculating the loadCIs calculated by
Figure BDA0001548639860000022
Performing the following steps;
obtaining the current load instruction value L of the power grid in the load changeset(i)The actual load value L is compared with the current load actual value L of the thermal power generating unitR(i)And according to a calculation formula
Figure BDA0001548639860000023
Calculating a check deviation rate E;
judging whether the check deviation rate E is smaller than a preset positive standard deviation rate E and larger than a preset negative standard deviation rate-E;
if the check deviation rate E is smaller than a preset positive standard deviation rate E and larger than a preset negative standard deviation rate-E, judging that the compensation coefficient K can compensate the static deviation in the load variation of the thermal power generating unit;
and if the check deviation rate E is equal to or greater than a preset standard deviation rate E, or the check deviation rate E is equal to or less than a preset negative standard deviation rate-E, determining that the compensation coefficient K cannot compensate the static deviation in the load variation of the thermal power unit.
The application provides a compensation method for load control static deviation of a thermal power generating unit, wherein a static deviation compensation loop interface is added in a load control loop of the thermal power generating unit, and the calculation process of the load compensation quantity comprises the steps of obtaining a main steam pressure rated value P of the thermal power generating unitT0Load variation set value RsetCompensating coefficient K and detecting current main steam pressure operation value P of thermal power generating unitT(i)(ii) a According to a calculation formula
Figure BDA0001548639860000024
Calculating the load compensation LC. The method for compensating the static deviation of the load control of the thermal power generating unit provided by the application is characterized in that the load compensation quantity L is addedCCompensating the load command value Lset(i)With the actual value of the load LR(i)The deviation between the thermal power generating units provides a powerful guarantee for improving the load control rapidity and the load control precision of thermal power generating unit scheduling by a power grid, and simultaneously provides a powerful support for improving the AGC and primary frequency modulation assessment indexes of a power plant.
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In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a load control loop of a conventional power grid to a thermal power generating unit;
FIG. 2 is a schematic diagram of a load control loop of a power grid to a thermal power generating unit.
Detailed Description
Fig. 2 is a schematic diagram of a load control loop of a power grid to a thermal power generating unit according to the present application, and as shown in fig. 2, the method for compensating for the static deviation of the load control of the thermal power generating unit includes adding a static deviation compensation loop interface in the load control loop of the thermal power generating unit, where the static deviation compensation loop interface is used to calculate a load compensation amount, where the calculation process of the load compensation amount includes,
step S100, obtaining a main steam pressure rated value P of the thermal power generating unitT0Load variation set value RsetCompensating coefficient K and detecting current main steam pressure operation value P of thermal power generating unitT(i)。
In the present application, the process of obtaining the compensation coefficient K includes,
step S110, obtaining the current load instruction value L of the power grid in the load changeset(i)The actual load value L is compared with the current load actual value L of the thermal power generating unitR(i)And according to a calculation formula
Figure BDA0001548639860000025
Calculating a load deviation delta L;
step S120, detecting the current main steam pressure operation value P of the thermal power generating unitT(i)；
Step S130, according to the calculation formula
Figure BDA0001548639860000031
And calculating a compensation coefficient K.
In actual operation, a certain time is required for the load change to reach the preset load change amount, and the main steam pressure operation value is not a stable value during the certain time, so that in actual calculation, a plurality of groups of offset compensation coefficients k in unit time t are required to be calculated firstly(i)Then, for a plurality of sets of offset compensation coefficients k(i)And adding and averaging to obtain an average value which is the compensation coefficient K.
The calculation of the compensation factor K is explained below by way of an exampleThe process of (1). After the detection configuration is correct, the load change amount is 15%, the load change rate is 1.5% (the load change amount per unit time t is 1.5%), and the main steam pressure operation value is p(i)The load fluctuation test of (1).
First, a load variation R is obtainedset15% load change rate rset1.5% and main steam pressure operating value PT(i)＝p(i)。
Then, a plurality of sets of offset compensation coefficients k in the unit time t are calculated(i). Which calculates an offset compensation coefficient k(i)The process specifically comprises the following steps: acquiring a main steam pressure operation value p every time t(i)And determining the load command value L in one load changeset(i)With the actual value of the load LR(i)Has a deviation of Δ l(i)I.e. Δ L ═ Δ L(i)(ii) a Will r isset＝1.5％、PT(i)＝p(i)And Δ L ═ Δ L(i)Substitution formula
Figure BDA0001548639860000032
Is that
Figure BDA0001548639860000033
Wherein P isT0Is the main steam pressure rated value; calculating to obtain a bias compensation coefficient k(i). It should be noted that this calculation process continues until the load variation amount RsetTo 15%.
Finally, for the calculated multiple groups of offset compensation coefficients k(i)Adding and averaging to obtain an average value which is the compensation coefficient K, namely
Figure BDA0001548639860000034
After the compensation coefficient K is calculated, the method further comprises the step of judging whether the compensation coefficient K can compensate the static deviation in the load variation of the thermal power generating unit, specifically comprising,
step S140, applying the calculated compensation coefficient K to the compensation quantity L for calculating the loadCIs calculated by
Figure BDA0001548639860000035
Performing the following steps;
step S150, obtaining the current load instruction value L of the power grid in the load changeset(i)The actual load value L is compared with the current load actual value L of the thermal power generating unitR(i)And according to a calculation formula
Figure BDA0001548639860000036
Calculating a check deviation rate E;
step S160, judging whether the check deviation rate E is smaller than a preset positive standard deviation rate E and larger than a preset negative standard deviation rate-E;
step S161, if the check deviation rate E is smaller than a preset positive standard deviation rate E and larger than a preset negative standard deviation rate-E, determining that the compensation coefficient K can compensate the static deviation in the load variation of the thermal power generating unit;
and step S162, if the check deviation rate E is equal to or greater than a preset standard deviation rate E, or the check deviation rate E is equal to or less than a preset negative standard deviation rate-E, determining that the compensation coefficient K cannot compensate the static deviation in the load variation of the thermal power unit.
Of course, the person skilled in the art can set the values of the positive standard deviation rate e and the negative standard deviation rate-e according to the actual requirement, for example, the positive standard deviation rate e is 3% or 5%, etc., and the negative standard deviation rate-e is-3% or-5%, etc., which all belong to the protection scope of the field.
And if the check deviation rate E is equal to or greater than the preset standard deviation rate E, correspondingly reducing the numerical value of the compensation coefficient K, and then judging whether the compensation coefficient K can compensate the static deviation in the load variation of the thermal power unit again until the compensation coefficient K can compensate the static deviation in the load variation of the thermal power unit.
And if the check deviation rate E is equal to or less than the preset negative standard deviation rate-E, correspondingly increasing the numerical value of the compensation coefficient K, and then judging whether the compensation coefficient K can compensate the static deviation in the load variation of the thermal power unit again until the compensation coefficient K can compensate the static deviation in the load variation of the thermal power unit.
Step S200, according to a calculation formula
Figure BDA0001548639860000041
Calculating the load compensation LC。
Load compensation amount L to be calculatedCThe full-working-condition compensation method is used for full-working-condition compensation quantities under different pressures, different loads and different load change rates, and can realize complete compensation of static deviation of a load instruction value and a load actual value when the load is changed according to a set load change quantity.
The method for compensating the static deviation of the load control of the thermal power generating unit provided by the application is characterized in that the load compensation quantity L is addedCCompensating the load command value Lset(i)With the actual value of the load LR(i)The deviation between the unit AGC and the primary frequency modulation can improve the load control precision and the load adjustment rapidity of the scheduling on the AGC and the primary frequency modulation of the thermal power generating unit, also improve the control quality of the AGC and the primary frequency modulation of the unit, and generate positive promotion effect on further improving the new energy accepting capability at present.

Claims (1)

1. A compensation method for load control static deviation of a thermal power generating unit is characterized by comprising the steps of additionally arranging a static deviation compensation loop interface in a load control loop of the thermal power generating unit, wherein the static deviation compensation loop interface is used for calculating a load compensation quantity, the calculation process of the load compensation quantity comprises the steps of,
obtaining main steam pressure rated value P of thermal power generating unitT0Load variation set value RsetCompensating coefficient K and detecting current main steam pressure operation value P of thermal power generating unitT(i)；
The process of obtaining the compensation coefficient K comprises the step of obtaining the current load instruction value L of the power grid in load changeset(i)The actual load value L is compared with the current load actual value L of the thermal power generating unitR(i)And according to the formula Δ L ═ Lset(i)-LR(i)Calculating load deviation delta L; detecting current main steam pressure operation value P of thermal power generating unitT(i)(ii) a According to a calculation formula
Figure FDA0002612664560000011
Calculating a compensation coefficient K;
judging whether the compensation coefficient K can compensate the static deviation in the load variation of the thermal power generating unit, and concretely comprising the step of applying the calculated compensation coefficient K to the calculation of the load compensation quantity LCIs calculated by
Figure FDA0002612664560000012
Performing the following steps; obtaining the current load instruction value L of the power grid in the load changeset(i)The actual load value L is compared with the current load actual value L of the thermal power generating unitR(i)And according to a calculation formula
Figure FDA0002612664560000013
Calculating a check deviation rate E; judging whether the check deviation rate E is smaller than a preset positive standard deviation rate E and larger than a preset negative standard deviation rate-E; if the check deviation rate E is smaller than a preset positive standard deviation rate E and larger than a preset negative standard deviation rate-E, judging that the compensation coefficient K can compensate the static deviation in the load variation of the thermal power generating unit; if the check deviation rate E is equal to or greater than a preset standard deviation rate E, or the check deviation rate E is equal to or less than a preset negative standard deviation rate-E, judging that the compensation coefficient K cannot compensate the static deviation in the load variation of the thermal power unit;
according to a calculation formula
Figure FDA0002612664560000014
Calculating the load compensation LC。
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