CN113078658B - Primary frequency modulation control method based on unit output limit - Google Patents

Primary frequency modulation control method based on unit output limit Download PDF

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Publication number
CN113078658B
CN113078658B CN202110297226.2A CN202110297226A CN113078658B CN 113078658 B CN113078658 B CN 113078658B CN 202110297226 A CN202110297226 A CN 202110297226A CN 113078658 B CN113078658 B CN 113078658B
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Prior art keywords
load
frequency modulation
primary frequency
unit
turbine unit
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CN113078658A (en
Inventor
陈鹏原
赵宇
郭楚珊
卫昱光
周小朋
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Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
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Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/20—Special adaptation of control arrangements for generators for steam-driven turbines

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Control Of Eletrric Generators (AREA)
  • Control Of Turbines (AREA)

Abstract

The invention discloses a primary frequency modulation control method based on unit output limitation, which specifically comprises the following steps: step 1, acquiring an original load instruction A of a turbine unit; step 2, calculating a rotation speed difference B; step 3, obtaining a primary frequency modulation action load instruction C; step 4, solving the lowest load lower limit D when the turbine unit participates in primary frequency modulation action load reduction; step 5, solving the highest load upper limit E when the turbine unit participates in primary frequency modulation action load lifting; step 6, comparing the primary frequency modulation action load instruction C with the lowest load lower limit D when the unit participates in primary frequency modulation, and taking a larger value to be named as F; step 7, comparing the result F obtained in the step 6 with the highest load upper limit E when the turbine unit participates in primary frequency modulation, and taking a smaller value to be named as G; and 8, solving a main control instruction H of the turbine unit. The invention can ensure that the unit can perform accurate primary frequency modulation according to the power grid requirement on the premise of safe and stable operation.

Description

Primary frequency modulation control method based on unit output limit
Technical Field
The invention belongs to the technical field of automatic control of thermal power generation, and relates to a primary frequency modulation control method based on unit output limit.
Background
Along with the increasing level of the power grid construction in China, when the frequency of the power grid is changed, an adjusting system of an operating unit in a grid-connected state changes the actual load of the unit according to the set rotation speed unequal rate so as to adapt to the load requirement of the power grid on the operating unit, and the mode of automatically adjusting the output power by the unit adjusting system to reduce the frequency change amplitude of the power grid is primary frequency modulation. The most widely used primary regulation control of the current unit is shown in fig. 1: the actual rotating speed of the steam turbine is subtracted from 3000r/min to obtain a rotating speed difference B, the rotating speed difference B is converted into a primary frequency modulation action load instruction C through a rotating speed unequal rate function, and the primary frequency modulation action load instruction C and the original load instruction A are overlapped to be used as a final load instruction H of the steam turbine. The upper and lower limit values of the primary frequency modulation operation load are set in the rotation speed unequal ratio function. However, the upper limit and the lower limit of the primary frequency modulation action load are simply set in the rotation speed unequal rate function, primary frequency modulation occurs when the actual load of the unit is at the lowest steady burning load and rated load, and the primary frequency modulation action cannot be accurately performed according to the relevant regulations of the power grid to adjust the load.
Disclosure of Invention
The invention aims to provide a primary frequency modulation control method based on unit output limitation, by adopting the method, the unit can be ensured to perform accurate primary frequency modulation action according to the power grid requirement on the premise of safe and stable operation (ensuring that the load of the unit after participating in primary frequency modulation is within a specified range).
The invention adopts the technical scheme that the primary frequency modulation control method based on the output limit of a unit specifically comprises the following steps:
step 1, acquiring an original load instruction A of a turbine unit;
step 2, calculating the actual rotating speed R and rated rotating speed R of the turbine unit 0 A rotational speed difference B between them;
step 3, converting the rotation speed difference B obtained in the step 2 through a rotation speed unequal rate function F (x) to obtain a primary frequency modulation action load instruction C;
step 4, solving the lowest load lower limit D when the turbine unit participates in primary frequency modulation action load reduction;
step 5, solving the highest load upper limit E when the turbine unit participates in primary frequency modulation action load lifting;
step 6, comparing the primary frequency modulation action load instruction C with the lowest load lower limit D when the unit participates in primary frequency modulation, and taking a larger value between the primary frequency modulation action load instruction C and the unit as F;
step 7, comparing the result F obtained in the step 6 with the highest load upper limit E when the turbine unit participates in primary frequency modulation, and taking a smaller value between the result F and the highest load upper limit E as G;
and 8, solving a main control instruction H of the turbine unit according to the original load instruction A of the turbine unit obtained in the step 1 and the result G obtained in the step 7.
The invention is also characterized in that:
the specific process of the step 2 is as follows: the rotational speed difference B is calculated using the following formula (1):
B＝R-R 0 (1)。
the specific process of the step 4 is as follows: the lowest load lower limit D when the turbine unit participates in primary frequency modulation action load reduction is calculated by adopting the following formula (2):
D＝P 3 -P real world (2)；
Wherein P is Real world The actual operation load of the turbine unit; p (P) 3 For the lowest load value of the unit which participates in primary frequency modulation and is allowed to run when the unit is under the lowest stable combustion load, the following formula (3) is adopted for calculation:
P 3 ＝P 1 -P B (3)；
wherein P is 1 For the lowest stable combustion load value of the unit, P B When the unit is in the lowest stable combustion load operation, the primary frequency modulation action reduces the maximum load action.
The specific process of the step 5 is as follows: the highest load upper limit E when the turbine unit participates in primary frequency modulation action load lifting is calculated by adopting the following formula (4):
E＝P 4 -P real world (4)；
Wherein P is 4 For the highest load value, P, of the unit which is allowed to run after participating in primary frequency modulation during rated load 4 The calculation is performed using the following formula (5):
P 4 ＝P 2 +P T (5)；
wherein P is 2 For rated load value of unit, P T When the unit is in rated load operation, the primary frequency modulation action increases the maximum action quantity of load.
The specific process of the step 8 is that the main control instruction H of the turbine unit is calculated by adopting the following formula (6):
H＝A+G (6)。
compared with the original control scheme, the primary frequency modulation control method based on the unit output limit has the advantages that firstly, the load characteristic value P of the unit, which can carry out + -P' adjustment on the load, is defined 5 And P 6 Then using the load characteristic value P 5 And P 6 And deducing specific upper and lower limit values when the unit participates in primary frequency modulation lifting load in different load sections together with the lowest stable combustion load and rated load of the unit. The control scheme provided by the invention has strong universality, and when the minimum stable combustion load and rated load of units with different installed capacities or the same unit are changed, a new load characteristic value P is found out only according to the method disclosed by the patent 3 And P 4 Then update P in the control scheme 3 And P 4 The primary frequency modulation action of the machine set according to the network modulation requirement can be realized.
Drawings
FIG. 1 is a logic block diagram of a conventional primary frequency modulation control scheme;
FIG. 2 is a graph of limiting values when load is increased during primary frequency modulation adjustment of different load section time groups according to power grid requirements;
FIG. 3 is a graph of limiting values when load is adjusted by primary frequency modulation of time groups of different load segments according to power grid requirements;
FIG. 4 is a logic block diagram of a primary frequency modulation control method based on unit output limitation of the present invention.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The primary frequency modulation control method based on the unit output limit can ensure that the unit can perform accurate primary frequency modulation according to the power grid requirement on the premise of safe and stable operation (ensuring that the load of the unit after participating in primary frequency modulation is within a specified range).
The invention relates to a plurality of load characteristic values of a unit in a primary frequency modulation process:
P 0 assembling capacity for the machine;
P 1 the minimum stable combustion load value of the unit is set;
P 2 the rated load value of the unit is set;
p' is the adjustment load amount during primary frequency modulation action;
P B when the unit is in the lowest stable combustion load operation, the primary frequency modulation action reduces the maximum load action;
P T when the unit is in rated load operation, the primary frequency modulation action increases the maximum action quantity of load;
P 3 the minimum load value P of the unit which participates in primary frequency modulation and is allowed to run is the lowest stable combustion load 3 ＝P 1 -P B ；
P 4 For the highest load value, P, of the unit which is allowed to run after participating in primary frequency modulation during rated load 4 ＝P 2 +P T ；
P 5 To at P 3 On the basis of calculation, the minimum load value, P, when the unit can carry out maximum load reduction adjustment of the primary frequency modulation quantity 5 ＝P 3 +P’；
P 6 To at P 4 On the basis of calculation, the maximum load value, P, when the unit can carry out maximum rising load adjustment of the primary frequency modulation quantity 6 ＝P 4 -P’；
Taking a machine set with the installed capacity of 600MW as an example and accessing a northwest power grid, P' is 6%P 0 ，P T Should be 5% P 0 ，P B Should be 3% P 0 . According to the northwest power grid requirement, the lower limit of the load output of the unit is P when the unit participates in primary frequency modulation 3 (i.e. the lower limit value after the original load instruction A of the machine set and the primary frequency modulation action load instruction is P 3 ) The method comprises the steps of carrying out a first treatment on the surface of the Similarly, when the unit participates in primary frequency modulation, the upper limit of the load output of the unit should be P 4 (i.e. the lower limit value after the original load instruction A of the machine set and the primary frequency modulation action load instruction is P 4 )。
According to the analysis, deducing that when the unit participates in primary frequency modulation, the primary frequency modulation action load reduction instruction can reach the maximum value-P' and meet the condition that the output of the unit does not exceed the minimum limit P 3 Is P 5 ＝P 3 +p'; the primary frequency modulation action load increasing instruction can reach the maximum value P' and meet the condition that the output of the unit does not exceed the maximum limit P 4 Is P 6 ＝P 4 -P’。
According to the above analysis, the load rise limit curve of the primary frequency modulation load of the time group in different load segments is obtained, as shown in FIG. 2 (the abscissa is the unit load value and the ordinate is the primary frequency modulation load amount), that is, the primary frequency modulation command upper limit value should be the curve J-K-P when the primary frequency modulation action rises the load 4 . That is, when the actual load of the unit is at P 1 -P 6 The upper limit of the primary frequency rising load adjustment amount is P' when the actual load is P 6 -P 2 In the middle, the upper limit of the primary frequency modulation rising load adjustment amount is a curve K-P 4 。
The load reduction limiting curve during primary frequency modulation load adjustment of the time group of different load segments is obtained by the same method, as shown in figure 3 (the abscissa is the unit load value and the ordinate is the primary frequency modulation load adjustment amount), that is, the primary frequency modulation command lower limit value should be curve P during the primary frequency modulation action load reduction 3 -M-N; that is, when the actual load of the unit is at P 1 -P 5 In the middle, the lower limit of the primary frequency modulation load reduction adjustment amount is a curve P 3 M, when the actual load is at P 5 -P 2 And when the load is reduced, the upper limit of the primary frequency modulation load reducing adjustment amount is-P'.
According to fig. 2, 3 and the above analysis, the primary frequency modulation control method based on the unit output limit of the present invention is obtained, a logic control block diagram is shown in fig. 4, SUB represents subtraction, ADD represents addition, and specifically includes the following steps:
step 1, acquiring an original load instruction A of a turbine unit;
step 2, calculating the actual rotating speed R and rated rotating speed R of the turbine unit 0 (R 0 Taking the rotation speed difference B between 3000 r/min);
the specific process of the step 2 is as follows: the rotational speed difference B is calculated using the following formula (1):
B＝R-R 0 (1)。
step 3, converting the rotation speed difference B obtained in the step 2 through a rotation speed unequal rate function F (x) to obtain a primary frequency modulation action load instruction C;
step 4, solving the lowest load lower limit D when the turbine unit participates in primary frequency modulation action load reduction;
the specific process of the step 4 is as follows: the lowest load lower limit D when the turbine unit participates in primary frequency modulation action load reduction is calculated by adopting the following formula (2):
D＝P 3 -P real world (2)；
Wherein P is Real world The actual operation load of the turbine unit; p (P) 3 The minimum load value is the minimum steady burning load value of the unit which participates in primary frequency modulation and then is allowed to run;
wherein P is 1 For the lowest stable combustion load value of the unit, P B When the unit is in the lowest stable combustion load operation, the primary frequency modulation action reduces the maximum load action.
Step 5, solving the highest load upper limit E when the turbine unit participates in primary frequency modulation action load lifting;
the specific process of the step 5 is as follows: the highest load upper limit E when the turbine unit participates in primary frequency modulation action load lifting is calculated by adopting the following formula (4):
E＝P 4 -P real world (4)；
Wherein P is 4 For the highest load value of the unit which is allowed to run after participating in primary frequency modulation at rated load,
wherein P is 2 For rated load value of unit, P T When the unit is in rated load operation, the primary frequency modulation action increases the maximum action quantity of load.
Step 6, comparing the primary frequency modulation action load instruction C with the lowest load lower limit D when the unit participates in primary frequency modulation, and taking a larger value between the primary frequency modulation action load instruction C and the unit as F;
step 7, comparing the result F obtained in the step 6 with the highest load upper limit E when the turbine unit participates in primary frequency modulation, and taking a smaller value between the result F and the highest load upper limit E as G;
and 8, solving a main control instruction H of the turbine unit according to the original load instruction A of the turbine unit obtained in the step 1 and the result G obtained in the step 7.
The specific process of the step 8 is that the main control instruction H of the turbine unit is calculated by adopting the following formula (6):
H＝A+G (6)。

Claims (2)

1. a primary frequency modulation control method based on unit output limit is characterized in that: the method specifically comprises the following steps:
step 1, acquiring an original load instruction A of a turbine unit;
step 2, calculating a rotation speed difference B between the actual rotation speed R and the rated rotation speed R0 of the turbine unit;
step 3, converting the rotation speed difference B obtained in the step 2 through a rotation speed unequal rate function F (x) to obtain a primary frequency modulation action load instruction C;
step 4, solving the lowest load lower limit D when the turbine unit participates in primary frequency modulation action load reduction;
the specific process of the step 4 is as follows: the lowest load lower limit D when the turbine unit participates in primary frequency modulation action load reduction is calculated by adopting the following formula (2):
d=p3-preal (2);
wherein P is the actual running load of the turbine unit;
p3 is the lowest load value of the unit which participates in primary frequency modulation and then is allowed to run when the unit is under the lowest stable combustion load, and the calculation is carried out by adopting the following formula (3):
P3＝P1-PB (3)；
wherein P1 is the lowest stable combustion load value of the unit, PB is the maximum load reduction amount of primary frequency modulation action when the unit is in the lowest stable combustion load operation;
step 5, solving the highest load upper limit E when the turbine unit participates in primary frequency modulation action load lifting;
the specific process of the step 5 is as follows: the highest load upper limit E when the turbine unit participates in primary frequency modulation action load lifting is calculated by adopting the following formula (4):
e=p4-preal (4);
wherein, P4 is the highest load value that the unit is allowed to run after participating in primary frequency modulation in rated load, and P4 is calculated by adopting the following formula (5):
P4＝P2+PT (5)；
wherein P2 is a rated load value of the unit, PT is the maximum action amount of primary frequency modulation action load lifting when the unit is in rated load operation;
step 6, comparing the primary frequency modulation action load instruction C with the lowest load lower limit D when the unit participates in primary frequency modulation, and taking a larger value between the primary frequency modulation action load instruction C and the unit as F;
step 7, comparing the result F obtained in the step 6 with the highest load upper limit E when the turbine unit participates in primary frequency modulation, and taking a smaller value between the result F and the highest load upper limit E as G;
step 8, obtaining a main control instruction H of the turbine unit according to the original load instruction A of the turbine unit obtained in the step 1 and the result G obtained in the step 7;
the specific process of the step 8 is that the main control instruction H of the turbine unit is calculated by adopting the following formula (6):
H＝A+G (6)。
2. the primary frequency modulation control method based on unit output limitation of claim 1, wherein the primary frequency modulation control method comprises the following steps: the specific process of the step 2 is as follows: the rotational speed difference B is calculated using the following formula (1):
B＝R-R0 (1)。
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102646980A (en) * 2012-04-12 2012-08-22 山东电力研究院 Novel primary frequency-modulation compensation control method of unit thermal generator set
WO2016011751A1 (en) * 2014-07-25 2016-01-28 国网上海市电力公司 Speed adjustment method based on combined circulation gas turbine system model
CN105826936A (en) * 2016-05-06 2016-08-03 上海明华电力技术工程有限公司 Thermal power generating unit intelligent primary frequency modulation control method aiming at large frequency-difference of power grid
CN111082438A (en) * 2020-01-03 2020-04-28 中国大唐集团科学技术研究院有限公司西北电力试验研究院 Control method for locking AGC instruction by priority primary frequency modulation function

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102646980A (en) * 2012-04-12 2012-08-22 山东电力研究院 Novel primary frequency-modulation compensation control method of unit thermal generator set
WO2016011751A1 (en) * 2014-07-25 2016-01-28 国网上海市电力公司 Speed adjustment method based on combined circulation gas turbine system model
CN105826936A (en) * 2016-05-06 2016-08-03 上海明华电力技术工程有限公司 Thermal power generating unit intelligent primary frequency modulation control method aiming at large frequency-difference of power grid
CN111082438A (en) * 2020-01-03 2020-04-28 中国大唐集团科学技术研究院有限公司西北电力试验研究院 Control method for locking AGC instruction by priority primary frequency modulation function

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