CN111255529B - Rapid response automatic power generation control system and method during operation of heat supply cylinder cutting unit - Google Patents
Rapid response automatic power generation control system and method during operation of heat supply cylinder cutting unit Download PDFInfo
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- CN111255529B CN111255529B CN202010194619.6A CN202010194619A CN111255529B CN 111255529 B CN111255529 B CN 111255529B CN 202010194619 A CN202010194619 A CN 202010194619A CN 111255529 B CN111255529 B CN 111255529B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/70—Type of control algorithm
- F05D2270/701—Type of control algorithm proportional
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
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- F05D2270/706—Type of control algorithm proportional-integral-differential
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Abstract
The invention discloses a quick response automatic power generation control system and a quick response automatic power generation control method when a heat supply cylinder cutting unit operates, wherein the system comprises a high-pressure cylinder steam inlet regulating valve arranged at an inlet of a high-pressure cylinder of a steam turbine, a PID controller connected with the high-pressure cylinder steam inlet regulating valve, a low-pressure cylinder steam inlet regulating butterfly valve arranged between a middle pressure cylinder and a low-pressure cylinder of the steam turbine, a function generator connected with the low-pressure cylinder steam inlet regulating butterfly valve, and a PI controller; the two paths of input signals of the PID controller are respectively an automatic power generation control instruction signal and a power generation actual load signal of the electric power sensor; the input signal of the function generator is an automatic power generation control command signal; the two paths of input signals of the PI controller are respectively exhaust pressure measurement values of exhaust pressure measurement points of a middle pressure cylinder between the middle pressure cylinder and the low pressure cylinder of the steam turbine and exhaust pressure set values of the middle pressure cylinder of the steam turbine; when the automatic power generation control instruction of the heat supply cylinder cutting unit changes, the steam inlet adjusting butterfly valve of the high-pressure cylinder and the low-pressure cylinder is adjusted simultaneously; the two paths of signals jointly act to meet the requirement of load change of the heat supply cylinder cutting unit.
Description
Technical Field
The invention relates to the technical field of automatic control of thermal power stations, in particular to a rapid response automatic power generation control system and method during operation of a heat supply cylinder cutting unit.
Background
In recent years, the installed capacity of new energy sources such as wind power, photovoltaic power, hydropower and the like in China continuously and rapidly increases, and the installed capacity in service and in construction are the first in the world. Wind power, photovoltaic and other new energy sources provide a large amount of clean power for us, but on the other hand, the randomness and the instability of the generated output of the wind power, the photovoltaic and other new energy sources also provide great challenges for the safe operation and the power supply guarantee of a power system. The power system regulation capability needs to be suitable for the requirements of large-scale development and digestion of new energy, especially in the region of the three north areas, a large number of thermal power generating units in winter bear resident heating tasks, but meanwhile, the local wind power is generally high in winter, the power load is not obviously increased, and the serious problems of wind abandoning, light abandoning and water abandoning occur in part of the regions at one time. In order to improve the capacity of new energy consumption, the peak regulation and frequency modulation potential of the thermal power generating unit is excavated, and the load regulation flexibility of the thermal power generating unit is very important, wherein the low-pressure cylinder cutting operation (or the low-pressure cylinder zero-output operation) is an important means of thermoelectric decoupling, so that the heat supply requirements of residents can be ensured, the electric load can be obviously reduced, and the capacity of absorbing clean energy sources such as wind, light and the like is improved.
However, the flexible operation requirement of the power grid on the generator set needs to be that the thermal decoupling is needed, the lowest power generation load is reduced to consume clean energy, and the power generation load is required to be quickly and flexibly adjusted to adapt to intermittent fluctuation of clean energy such as wind, light and the like, so that the power balance and stability of the whole power grid are maintained. Therefore, automatic power generation control (AGC) is an indispensable important technology for a power grid, is one of important measures for guaranteeing safe and economical operation of the power grid, and is also one of important functions of a power grid dispatching automation system. In order to encourage and compensate the automatic generating control unit, a compensation checking measurement method is provided for the automatic generating control in two rules of each power grid, and the performance index requirement for flexibly adjusting the generating unit is defined.
The automatic power generation control assessment principle in the current 'two rules' of each power grid is mainly that the automatic power generation control assessment index comprises an availability index K A Regulating performance index K 1 (adjusting the rate), K 2 (adjustment accuracy), K 3 (response time).
In recent years, the heat supply cylinder cutting technology is a major breakthrough to the original heat supply operation mode, and compared with the technologies such as high back pressure heat supply, optical axis heat supply transformation and the like, the heat supply cylinder cutting technology can realize the flexible switching of the heat supply unit in a non-stop mode of a steam extraction condensing type operation mode and a high back pressure operation mode. The core of the technology is that only a small amount of cooling steam is reserved to enter the low-pressure cylinder, so that the zero-output operation of the low-pressure rotor is realized, and the electric load is reduced; more steam enters the heating system, and the heat supply capacity is improved.
Although heat supply cylinder cutting machineThe group can well solve the problems of deep peak regulation and thermoelectric decoupling, but the load regulation process is calculated according to the power ratio of the low-pressure cylinder of 20% -30% because of less participation of the output change of the low-pressure cylinder, so that the actual unit load change corresponding to the same valve position instruction is only 70% -80% of the pure condensation working condition. In addition, when the heat supply cylinder is cut, the adjustment capacity of the heat supply auxiliary load is 0, so that the speed, the amplitude and the steady-state adjustment time of the heat supply cylinder cutting unit in response to automatic power generation control are reduced correspondingly and greatly. In addition, the existing conventional unit mainly depends on a short-time boiler heat storage supporting steam turbine to quickly increase flow and power along with an automatic power generation control instruction. In order to ensure the heat supply flow and the load demand, the heat supply cylinder cutting unit runs at the position of the opening of the valve of the steam turbine close to the upper limit for a long time, so that when an automatic power generation control instruction starts an upward action, the steam turbine cannot open the valve to increase the flow and the power, and the unit cannot respond to the automatic power generation control instruction, so that the actual load is slowly increased. At present, the automatic power generation control assessment phenomenon is serious and K exists when the type of heat supply cylinder cutting unit operates in the winter heat supply period 1 、K 2 、K 3 The value can not reach the standard. In order to cope with the situation, measures are needed to optimize and reform the control system.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a quick response automatic power generation control system and a quick response automatic power generation control method for a heat supply cylinder cutting unit during operation, so that the heat supply cylinder cutting unit can meet the assessment requirement of a power grid on automatic power generation control on the premise of ensuring heat supply during heat supply operation.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the quick response automatic power generation control system comprises a high-pressure cylinder steam inlet regulating valve 1 arranged at an inlet of a high-pressure cylinder 2 of a steam turbine, a PID controller 13 connected with the high-pressure cylinder steam inlet regulating valve, a low-pressure cylinder steam inlet regulating butterfly valve 5 arranged on a low-pressure communication pipe between a medium-pressure cylinder 4 of the steam turbine and a low-pressure cylinder 6 of the steam turbine, a function generator 14 connected with the low-pressure cylinder steam inlet regulating butterfly valve 5, a PI controller 15, a heat supply main pipe pressure regulating butterfly valve 16 and a heat supply main pipe pressure measuring point 17 which are arranged on a steam extraction pipeline of the medium-pressure cylinder 4 of the steam turbine to a heat supply main pipe; the two paths of input signals of the PID controller 13 are respectively an automatic power generation control command signal 12 and a power generation actual load signal of an electric power sensor 10 arranged at the output end of the generator; the input signal of the function generator 14 is an automatic generation control command signal 12; the two input signals of the PI controller 15 are respectively exhaust pressure measurement values of the exhaust pressure measuring point 9 of the middle pressure cylinder on the low pressure communication pipe between the middle pressure cylinder 4 and the low pressure cylinder 6 of the steam turbine, and the exhaust pressure set value 11 of the middle pressure cylinder of the steam turbine.
According to the control method of the quick response automatic power generation control system when the heat supply cylinder cutting unit operates, when the automatic power generation control command of the heat supply cylinder cutting unit changes, the automatic power generation control command signal 12 changes quickly, deviation occurs between the automatic power generation control command signal and an actual power generation load signal from the electric power sensor 10, the PID controller 13 is activated to output action, and the high-pressure cylinder steam inlet regulating valve 1 is regulated; meanwhile, the output of the function generator 14 also acts along with the change of the automatic power generation control command signal 12 to adjust the low-pressure cylinder steam inlet adjusting butterfly valve 5; the two paths of signals jointly act to meet the requirement of load change of the heat supply cylinder cutting unit.
The specific control method comprises the following steps: the high-pressure cylinder steam inlet regulating valve 1 adopts the regulation of a PID controller 13, and the PID controller 13 comprises a proportional (P) function, an integral (I) function and a differential (D) function; when the automatic power generation control command signal 12 gives a load lifting command, the differential (D) action of the PID controller 13 directly gives a valve opening command to the high-pressure cylinder steam inlet regulating valve 1, meanwhile, as positive deviation occurs between the automatic power generation control command signal 12 and the power generation actual load signal of the electric power sensor 10, the proportional (P) action and the integral (I) action of the PID controller 13 start to act, and the valve opening command is sent to meet the load lifting requirement of the hot-cut cylinder unit; similarly, when the automatic power generation control command signal 12 gives a load reducing command, the differential (D) action of the PID controller 13 directly gives a valve closing command to the high-pressure cylinder steam inlet regulating valve 1, and meanwhile, as negative deviation occurs between the automatic power generation control command signal 12 and the power generation actual load signal of the electric power sensor 10, the proportional (P) action and integral (I) action of the PID controller 13 start to act, and the valve closing command is sent out to meet the load reducing requirement of the heat supply cylinder cutting unit;
the adjustment of the low-pressure cylinder steam inlet adjusting butterfly valve 5 adopts the combined action of two paths of adjustment and is divided into an automatic power generation control instruction stable working condition and an automatic power generation control instruction change working condition;
when the automatic power generation control instruction is stable, the exhaust pressure of the pressure cylinder in the steam turbine needs to be ensured to be maintained within an allowable range during normal heat supply, and the steam turbine is dangerous due to the fact that the pressure is too high, and the limit value of tripping is triggered; the pressure is too low to maintain the pressure of the heat supply main pipe required by normal heat supply, so when an automatic power generation control instruction is stable, the aim is realized through a PI controller 15, a demand signal from a medium pressure cylinder exhaust pressure set value 11 is met through the action of a proportion (P) and the action of an integral (I), and when the exhaust pressure measured value of a medium pressure cylinder exhaust pressure measuring point 9 is higher than the medium pressure cylinder exhaust pressure set value 11, the action of the proportion (P) and the action of the integral (I) enables the low pressure cylinder intake regulating butterfly valve 5 to be closed; when the exhaust pressure measured value of the exhaust pressure measuring point 9 of the medium pressure cylinder is lower than the exhaust pressure set value 11 of the medium pressure cylinder, the low pressure cylinder exhaust regulating butterfly valve 5 is opened under the action of the proportion (P) and the integral (I), so that the exhaust pressure measured value of the exhaust pressure measuring point 9 of the medium pressure cylinder meets the operation requirement;
when the automatic power generation control instruction changes, the function generator 14 directly predicts and adjusts the low-pressure cylinder steam inlet adjusting butterfly valve 5, and as the low-pressure cylinder steam inlet adjusting butterfly valve of the heat supply cylinder cutting unit is too fast and too large to open, the heat supply pressure is influenced, the upper limit and the lower limit of an output value are set in the function generator 14 according to the actual running condition of the heat supply unit, so that the safety of the unit is ensured; the function middle section is processed according to linearization;
because the high-pressure cylinder steam inlet regulating valve 1 and the low-pressure cylinder steam inlet regulating butterfly valve 5 act simultaneously, the steam outlet pressure measured value of the medium-pressure cylinder steam outlet pressure measuring point 9 and the pressure measured value of the heat supply main pipe pressure measuring point 17 are influenced, the control of the steam outlet pressure measured value of the medium-pressure cylinder steam outlet pressure measuring point 9 is completed by the PI controller 15, and the control method is the same as the control method when an automatic power generation control instruction is stable; the pressure change range of the heat supply main pipe pressure measuring point 17 needs to be maintained in a normal range, and when the pressure measured value of the heat supply main pipe pressure measuring point 17 is too low, the heat supply main pipe pressure regulating butterfly valve 16 needs to be opened manually; when the pressure measured value of the pressure measuring point 17 of the main heat supply pipe is too high, the pressure regulating butterfly valve 16 of the main heat supply pipe needs to be manually closed to ensure the safety of heat supply.
The upper limit of the output value set in the function generator 14 is 25, and the lower limit is 5; the value corresponding to the lowest steady burning load (40% rated load) in the winter heating period was set to 5, and the value corresponding to the highest load (80% rated load) that could be achieved was set to 25.
The normal range maintained by the pressure change range of the pressure measuring point 17 of the heat supply main pipe is as follows: when the hot water supply side circulating pump is a steam-driven unit, the pressure change range of the hot water supply main pipe pressure measuring point 17 needs to be maintained at 0.2-0.3MPa, and when the hot water supply side circulating pump is a motor unit, the pressure change range of the hot water supply main pipe pressure measuring point 17 needs to be maintained at 0.03-0.05MPa.
Compared with the prior art, the invention has the following advantages:
1) The control system can effectively improve the automatic power generation control performance of the heat supply cylinder cutting unit, and has the advantages that after the adjusting function of the low-pressure cylinder steam inlet adjusting butterfly valve 5 is added, when the automatic power generation control instruction of the heat supply cylinder cutting unit changes, the output power of the high-pressure cylinder of the steam turbine can change. The output power of the middle pressure cylinder and the low pressure cylinder of the steam turbine can be changed, so that the high pressure cylinder, the middle pressure cylinder and the low pressure cylinder of the heat supply cylinder cutting unit can effectively and quickly respond when the automatic power generation control command is increased, and the quick load response capability of the unit is improved.
2) The control method can meet the requirements of quick and accurate response to the automatic power generation control instruction when the hot cut cylinder unit operates. Meanwhile, the stability of the medium exhaust pressure and the stability of the heat supply flow and the pressure are maintained, and further guarantee is provided for the economic and safe operation of the power plant.
Drawings
The figure is a schematic diagram of the system structure of the invention.
In the figure: 1, a high-pressure cylinder steam inlet regulating valve; 2, a high-pressure cylinder of the steam turbine; 3—a reheater; 4, a middle pressure cylinder of the steam turbine; 5, a low-pressure cylinder steam inlet adjusting butterfly valve; 6, a low-pressure cylinder of the steam turbine; 7, a generator set rotor; 8-a generator; 9, measuring a steam exhaust pressure point of the medium pressure cylinder; 10—an electric power sensor; 11-a set value of exhaust pressure of the medium pressure cylinder; 12-automatic power generation control command signal; 13—a PID controller; 14-a function generator; 15—pi controller; 16-a main heating pipe pressure regulating butterfly valve; 17-heat supply main pipe pressure measuring point.
Detailed Description
As shown in figure 1, the invention relates to a quick response automatic power generation control system when a hot-cut cylinder unit operates, which comprises a high-pressure cylinder steam inlet regulating valve 1 arranged at an inlet of a high-pressure cylinder 2 of a steam turbine, a PID controller 13 connected with the high-pressure cylinder steam inlet regulating valve, a low-pressure cylinder steam inlet regulating butterfly valve 5 arranged on a low-pressure communication pipe between a middle-pressure cylinder 4 of the steam turbine and a low-pressure cylinder 6 of the steam turbine, a function generator 14 connected with the low-pressure cylinder steam inlet regulating butterfly valve 5, a PI controller 15, a heat supply main pipe pressure regulating butterfly valve 16 and a heat supply main pipe pressure measuring point 17 which are arranged on a steam extraction pipeline of the middle-pressure cylinder 4 of the steam turbine to a heat supply main pipe; the two paths of input signals of the PID controller 13 are respectively an automatic power generation control command signal 12 and a power generation actual load signal of an electric power sensor 10 arranged at the output end of the generator; the input signal of the function generator 14 is an automatic generation control command signal 12; the two input signals of the PI controller 15 are respectively exhaust pressure measurement values of the exhaust pressure measuring point 9 of the middle pressure cylinder on the low pressure communication pipe between the middle pressure cylinder 4 and the low pressure cylinder 6 of the steam turbine, and the exhaust pressure set value 11 of the middle pressure cylinder of the steam turbine.
As shown in fig. 1, according to the control method of the rapid response automatic power generation control system when the heat supply cylinder cutting unit is operated, when the automatic power generation control command of the heat supply cylinder cutting unit is changed, an automatic power generation control command signal 12 is rapidly changed, deviation occurs between the automatic power generation control command signal and a power generation actual load signal from an electric power sensor 10, and a PID controller 13 is activated to output and act so as to adjust a high-pressure cylinder steam inlet regulating valve 1; meanwhile, the output of the function generator 14 also acts along with the change of the automatic power generation control command signal 12 to adjust the low-pressure cylinder steam inlet adjusting butterfly valve 5; the two paths of signals jointly act to meet the requirement of load change of the heat supply cylinder cutting unit.
The specific working principle is as follows: when the automatic power generation control instruction changes, the heat supply cylinder cutting unit is acted by the high-pressure cylinder steam inlet regulating valve 1 and the low-pressure cylinder steam inlet regulating butterfly valve 5 together.
The specific control method comprises the following steps: the high-pressure cylinder steam inlet regulating valve 1 adopts the regulation of a PID controller 13, and the PID controller 13 comprises a proportional (P) function, an integral (I) function and a differential (D) function. When the automatic power generation control command signal 12 gives a load lifting command, the differential (D) action of the PID controller 13 directly gives a valve opening command to the high-pressure cylinder steam inlet regulating valve 1, and meanwhile, the positive deviation between the automatic power generation control command signal 12 and the power generation actual load signal of the electric power sensor 10 causes the proportional (P) action and integral (I) action of the PID controller 13 to start to act, and the valve opening command is sent out to meet the load lifting requirement of the heat supply cylinder cutting unit. Similarly, when the automatic power generation control command signal 12 gives a load reducing command, the differential (D) action of the PID controller 13 directly gives a valve closing command to the high-pressure cylinder steam inlet regulating valve 1, and meanwhile, as negative deviation occurs between the automatic power generation control command signal 12 and the power generation actual load signal of the electric power sensor 10, the proportional (P) action and integral (I) action of the PID controller 13 start to act, and a valve closing command is sent to meet the load reducing requirement of the heat supply cylinder cutting unit.
The strategy which only depends on the high-pressure cylinder steam inlet regulating valve 1 to work has the advantages of simplicity and easiness in operation and can meet the requirements of most heating units. However, the disadvantage is that the operation requirement cannot be met when the device is applied to a heat supply cylinder cutting unit. Because the high-pressure cylinder steam inlet regulating valve 1 is independently and rapidly opened or closed, steam needs to sequentially do work through the high-pressure cylinder of the steam turbine, the reheater of the boiler and the medium-pressure cylinder of the steam turbine, the flow of acting steam entering the medium-pressure cylinder of the steam turbine cannot be obviously changed within a short time (10-13 s), and the increased or decreased steam quantity cannot enter the low-pressure cylinder of the steam turbine to continuously do work, but directly enters the heat supply main pipe through the heat supply main pipe pressure regulating butterfly valve 16, so that the response of automatic power generation control is relatively lagged compared with that of a non-heat supply cylinder cutting unit. Therefore, the control system of the invention adds an auxiliary control strategy of the low-pressure cylinder steam inlet adjusting butterfly valve 5 on the basis of the conventional method.
The adjustment of the low-pressure cylinder steam inlet adjusting butterfly valve 5 adopts the combined action of two paths of adjustment and is divided into an automatic power generation control instruction stable working condition and an automatic power generation control instruction change working condition.
When the automatic power generation control instruction is stable, the invention is only aimed at the heat supply cylinder cutting unit, so that the heat supply stability is very important. During normal heat supply, the exhaust pressure of the pressure cylinder in the steam turbine needs to be ensured to be maintained within an allowable range (normally kept at 0.3-0.4 MPa), because the pressure is too high, the steam turbine is dangerous, and the limit value of tripping is triggered; the pressure is too low to maintain the pressure of the main heating pipe required for normal heating. Therefore, when the automatic power generation control command is stable, the aim is needed to be achieved through the PI controller 15, the demand signal from the intermediate pressure cylinder exhaust pressure set value 11 is met through the action of the proportion (P) and the action of the integral (I), and when the exhaust pressure measured value of the intermediate pressure cylinder exhaust pressure measuring point 9 is higher than the intermediate pressure cylinder exhaust pressure set value 11, the low pressure cylinder intake regulating butterfly valve 5 is closed through the action of the proportion (P) and the action of the integral (I); when the exhaust pressure measured value of the exhaust pressure measuring point 9 of the medium pressure cylinder is lower than the exhaust pressure set value 11 of the medium pressure cylinder, the low pressure cylinder exhaust regulating butterfly valve 5 is opened under the action of the proportion (P) and the integral (I), so that the exhaust pressure measured value of the exhaust pressure measuring point 9 of the medium pressure cylinder meets the operation requirement.
When the automatic power generation control instruction changes, the function generator 14 directly predicts and adjusts the low-pressure cylinder steam inlet adjusting butterfly valve 5, and as the low-pressure cylinder steam inlet adjusting butterfly valve of the heat supply cylinder cutting unit is opened too fast and too much, the heat supply pressure is influenced, so that the upper limit and the lower limit of the output value are set in the function generator 14 in combination with the actual running condition of the heat supply unit at first, and the safety of the unit is ensured (normally, the upper limit and the lower limit are recommended to be set at 5-25, the working process lower than 5 can lead the heat supply steam side pressure to generate fluctuation, and the power generation amount of the steam turbine is increased and the heat supply capacity is reduced because the upper limit and the lower limit are higher than 25). In the hot-cut cylinder block, the parameter setting of the function generator 14 may be set to 5 for the lowest steady burning load (40% rated load) in the winter heating period and 25 for the highest load (80% rated load) that can be achieved. And the function middle section is processed according to linearization. The specific parameters are shown in the following table:
table: parameter setting table for function generator 14
Because the high-pressure cylinder steam inlet regulating valve 1 and the low-pressure cylinder steam inlet regulating butterfly valve 5 act simultaneously, the steam outlet pressure measurement value of the medium-pressure cylinder steam outlet pressure measuring point 9 and the pressure measurement value of the heat supply main pipe pressure measuring point 17 can be influenced, the control of the steam outlet pressure measurement value of the medium-pressure cylinder steam outlet pressure measuring point 9 is completed by the PI controller 15, and the control method is the same as the control method when the automatic power generation control instruction is stable. The pressure variation range of the pressure measuring point 17 of the heat supply main pipe is usually maintained at 0.2-0.3MPa (suitable for a set with a steam-driven hot water side circulating pump) or 0.03-0.05MPa (suitable for a set with a motor-driven hot water side circulating pump). When the pressure measured value of the pressure measuring point 17 of the main heating pipe is too low, the main heating pipe pressure regulating butterfly valve 16 needs to be opened manually; when the pressure measured value of the pressure measuring point 17 of the main heat supply pipe is too high, the pressure regulating butterfly valve 16 of the main heat supply pipe needs to be manually closed to ensure the safety of heat supply. The main pressure regulating butterfly valve 16 is rarely operated during normal operation, so manual control is adopted.
The control system can effectively improve the automatic power generation control performance of the heat supply cylinder cutting unit, and has the advantages that after the adjusting function of the low-pressure cylinder steam inlet adjusting butterfly valve 5 is added, when the automatic power generation control instruction of the heat supply cylinder cutting unit changes, the output power of the high-pressure cylinder of the steam turbine can change. The output power of the middle pressure cylinder and the low pressure cylinder of the steam turbine can be changed, so that the high pressure cylinder, the middle pressure cylinder and the low pressure cylinder of the heat supply cylinder cutting unit can effectively and quickly respond when the automatic power generation control command is increased, and the quick load response capability of the unit is improved.
In conclusion, the control method can meet the requirements of quick and accurate response to the automatic power generation control instruction when the hot-cut cylinder unit operates. Meanwhile, the stability of the medium exhaust pressure and the stability of the heat supply flow and the pressure are maintained, and further guarantee is provided for the economic and safe operation of the power plant.
Claims (4)
1. A control method of a quick response automatic power generation control system when a heat supply cylinder cutting unit operates is characterized by comprising the following steps of: the control system comprises a high-pressure cylinder steam inlet regulating valve (1) arranged at an inlet of a high-pressure cylinder (2) of a steam turbine, a PID controller (13) connected with the high-pressure cylinder steam inlet regulating valve, a low-pressure cylinder steam inlet regulating butterfly valve (5) arranged on a low-pressure communication pipe between a medium-pressure cylinder (4) of the steam turbine and a low-pressure cylinder (6) of the steam turbine, a function generator (14) connected with the low-pressure cylinder steam inlet regulating butterfly valve, and a PI controller (15), a heat supply main pipe pressure regulating butterfly valve (16) and a heat supply main pipe pressure measuring point (17) which are arranged on a steam extraction pipeline of the medium-pressure cylinder (4) of the steam turbine to a heat supply main pipe; two paths of input signals of the PID controller (13) are respectively an automatic power generation control command signal (12) and a power generation actual load signal of an electric power sensor (10) arranged at the output end of the generator; the input signal of the function generator (14) is an automatic power generation control command signal (12); two paths of input signals of the PI controller (15) are respectively exhaust pressure measurement values of an exhaust pressure measuring point (9) of the middle pressure cylinder on a low-pressure communication pipe between the middle pressure cylinder (4) of the steam turbine and the low pressure cylinder (6) of the steam turbine, and exhaust pressure set values (11) of the middle pressure cylinder of the steam turbine;
the control method comprises the following steps: when the automatic power generation control command of the heat supply cylinder cutting unit changes, the automatic power generation control command signal (12) changes rapidly, deviation occurs between the automatic power generation control command signal and a power generation actual load signal from the electric power sensor (10), the PID controller (13) is activated to output and act, and the high-pressure cylinder steam inlet regulating valve (1) is regulated; meanwhile, the output of the function generator (14) also acts along with the change of the automatic power generation control command signal (12) to adjust the low-pressure cylinder steam inlet adjusting butterfly valve (5); the two paths of signals jointly act to meet the requirement of load change of the heat supply cylinder cutting unit.
2. The control method according to claim 1, characterized in that: the method comprises the following steps:
the high-pressure cylinder steam inlet regulating valve (1) adopts the regulation of a PID controller (13), and the PID controller (13) comprises a proportion P function, an integral I function and a differential D function; when the automatic power generation control command signal (12) gives a load lifting command, the differential action D of the PID controller (13) can directly give a valve opening command to the high-pressure cylinder steam inlet regulating valve (1), meanwhile, as positive deviation occurs between the automatic power generation control command signal (12) and a power generation actual load signal of the electric power sensor (10), the proportional action and the integral action I of the PID controller (13) start to act, and the valve opening command is sent out, so that the load lifting requirement of a heat supply cylinder cutting unit is met; meanwhile, as negative deviation appears between the automatic power generation control command signal (12) and the power generation actual load signal of the electric power sensor (10), the proportion P action and the integral I action of the PID controller (13) start to act, and the command of closing and regulating the valve is sent out, so as to meet the load reducing requirement of the heat supply cylinder cutting unit;
the adjustment of the low-pressure cylinder steam inlet adjusting butterfly valve (5) adopts the combined action of two paths of adjustment and is divided into an automatic power generation control instruction stable working condition and an automatic power generation control instruction change working condition;
when the automatic power generation control instruction is stable, the exhaust pressure of the pressure cylinder in the steam turbine needs to be ensured to be maintained within an allowable range during normal heat supply, and the steam turbine is dangerous due to the fact that the pressure is too high, and the limit value of tripping is triggered; the pressure is too low and the pressure of a heat supply main pipe required by normal heat supply cannot be maintained, so when an automatic power generation control instruction is stable, the aim is realized through a PI controller (15), a demand signal from a medium pressure cylinder exhaust pressure set value (11) is met through a proportion P effect and an integral I effect, and when the exhaust pressure measured value of a medium pressure cylinder exhaust pressure measuring point (9) is higher than the medium pressure cylinder exhaust pressure set value (11), the low pressure cylinder intake regulating butterfly valve (5) is closed through the action of the proportion P effect and the integral I effect; when the exhaust pressure measured value of the exhaust pressure measuring point (9) of the medium pressure cylinder is lower than the exhaust pressure set value (11) of the medium pressure cylinder, the proportion P function and the integral I function enable the low pressure cylinder exhaust regulating butterfly valve (5) to be opened, so that the exhaust pressure measured value of the exhaust pressure measuring point (9) of the medium pressure cylinder meets the operation requirement;
when an automatic power generation control instruction changes, the function generator (14) directly predicts and adjusts the low-pressure cylinder steam inlet adjusting butterfly valve (5), and as the low-pressure cylinder steam inlet adjusting butterfly valve of the heat supply cylinder cutting unit is too fast and too large to open, the heat supply pressure is influenced, the upper limit and the lower limit of an output value are set in the function generator (14) according to the actual running condition of the heat supply unit, and the safety of the unit is ensured; the middle section of the function is processed according to linearization;
because the high-pressure cylinder steam inlet regulating valve (1) and the low-pressure cylinder steam inlet regulating butterfly valve (5) act simultaneously, the steam outlet pressure measurement value of the medium-pressure cylinder steam outlet pressure measuring point (9) and the pressure measurement value of the heat supply main pipe pressure measuring point (17) are influenced, the control of the steam outlet pressure measurement value of the medium-pressure cylinder steam outlet pressure measuring point (9) is completed by the PI controller (15), and the control method is the same as the control method when the automatic power generation control instruction is stable; the pressure change range of the heat supply main pipe pressure measuring point (17) needs to be maintained in a normal range, and when the pressure measured value of the heat supply main pipe pressure measuring point (17) is too low, the heat supply main pipe pressure regulating butterfly valve (16) needs to be opened manually; when the pressure measured value of the pressure measuring point (17) of the main heating pipe is too high, the pressure regulating butterfly valve (16) of the main heating pipe is required to be manually closed to ensure the safety of heating.
3. The control method according to claim 2, characterized in that: the upper limit of the output value set in the function generator (14) is 25, and the lower limit is 5; the value corresponding to the lowest steady burning load in the winter heating period, namely, 40% rated load is set to 5, and the value corresponding to the highest load which can be achieved, namely, 80% rated load is set to 25.
4. The control method according to claim 2, characterized in that: the normal range maintained by the pressure change range of the pressure measuring point (17) of the heat supply main pipe is as follows: when the hot water supply side circulating pump is a steam-driven unit, the pressure change range of the hot water supply main pipe pressure measuring point (17) needs to be maintained at 0.2-0.3MPa, and when the hot water supply side circulating pump is an electric unit, the pressure change range of the hot water supply main pipe pressure measuring point (17) needs to be maintained at 0.03-0.05MPa.
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| CN112412557B (en) * | 2020-11-09 | 2022-09-06 | 大庆石油管理局有限公司 | Steam turbine high-side flexible heat supply system with auxiliary frequency modulation function |
| CN112415970A (en) * | 2020-11-23 | 2021-02-26 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Method for eliminating large-range fluctuation of fuel quantity caused by small-range change of AGC (automatic gain control) instruction |
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