CN115079560A - Oil gas temperature control method and system for compressed air energy storage system - Google Patents
Oil gas temperature control method and system for compressed air energy storage system Download PDFInfo
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- CN115079560A CN115079560A CN202210283143.2A CN202210283143A CN115079560A CN 115079560 A CN115079560 A CN 115079560A CN 202210283143 A CN202210283143 A CN 202210283143A CN 115079560 A CN115079560 A CN 115079560A
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses an oil-gas temperature control method for a compressed air energy storage system, which is used for the compressed air energy storage system, the compressed air energy storage system comprises a multi-stage compressor and a multi-stage oil-gas heat exchanger, the oil quantity of the primary oil-gas heat exchanger is the same as that of the final-stage oil-gas heat exchanger, and the method comprises the following steps: establishing a cascade control loop for controlling the outlet air temperature of the final-stage compressor; introducing an oil temperature correction quantity to correct the set value of the outlet air temperature of the final-stage oil-gas heat exchanger in real time; the compressor airflow correction amount is introduced to correct the nonlinearity of the primary regulator and act as a feed forward corrected secondary regulator. The invention also discloses an oil gas temperature control system for the compressed air energy storage system. The oil-gas temperature control method and the oil-gas temperature control system for the compressed air energy storage system can control the outlet oil temperature and the inlet air temperature within a reasonable range, have simple structure, are easy to realize and are suitable for engineering application.
Description
Technical Field
The invention relates to an oil-gas temperature control method and system for a compressed air energy storage system, and belongs to the technical field of large-scale physical energy storage.
Background
China further takes renewable energy as the development focus of an energy system, and proposes to adjust the proportion of the renewable energy, which means that the renewable energy becomes the main body of energy consumption increment gradually; but the renewable energy has the inherent defects of intermittency, instability and the like, so that the power generation of the renewable energy cannot be subjected to rapid peak load regulation, and the load balance of a power grid is damaged to a certain extent. The compressed air energy storage power generation has the characteristics of large scale, strong flexibility and the like, can enhance the response capability of a power grid to faults, makes up the defect that renewable energy sources cannot adjust peaks, and has important strategic significance for building strong smart power grids.
Because of the high-temperature pressure vessel manufacturing difficulty is big, the installation is difficult to solve to and reasons such as the operating temperature restriction of equipment, this means to obtain higher gas storage pressure and need adopt multistage compressor and multistage cooling mode, accurate effectual control strategy can guarantee that multistage compression and refrigerated heat accumulation formula air energy storage system are steady, the efficient operation. Through a control strategy of feedforward compensation, parameters such as temperature, pressure and the like of each stage of compressor and cooling material are ensured to be in a reasonable working range, so that coordinated control among multi-stage equipment is realized, and finally the safety and efficiency of the system are ensured.
At present, the research on the control of the compressor at home and abroad has a certain foundation, but the thermal inertia of a multi-stage compressor and a multi-stage heat exchanger system is larger, and the control research is not deep. Patent application No. 202011611660.5 discloses "a method for controlling inlet temperature of cascade compressor of compressed air energy storage power station", which takes oil temperature as control target and realizes adjustment of air temperature through nonlinear function. The method has the defects that the accuracy of the air temperature is sacrificed by using the oil temperature as a control target, and the condition of overshoot or hysteresis is easy to occur in the adjustment of the air temperature by using a nonlinear function.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an oil-gas temperature control method and system for a compressed air energy storage system, so that the vacancy of the temperature control method of the conventional multistage compressor and multistage heat exchanger is filled, the outlet oil temperature and the inlet air temperature can be controlled within a reasonable range, the structure is simple, the realization is easy, and the method and system are suitable for engineering application.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an oil-gas temperature control method for a compressed air energy storage system, wherein the method is used for the compressed air energy storage system, the compressed air energy storage system comprises a multistage compressor and a multistage oil-gas heat exchanger, and a primary compressor, a primary oil-gas heat exchanger, a middle-stage compressor, a final-stage oil-gas heat exchanger and a final-stage compressor are sequentially arranged, the oil quantity of the primary oil-gas heat exchanger and the oil quantity of the final-stage oil-gas heat exchanger are the same, and the method comprises the following steps:
establishing a cascade control loop for controlling the outlet air temperature of the final-stage compressor;
introducing an oil temperature correction quantity to correct the set value of the outlet air temperature of the final-stage oil-gas heat exchanger in real time;
the compressor airflow correction amount is introduced to correct the nonlinearity of the primary regulator and act as a feed forward corrected secondary regulator.
The cascade control loop comprises a main regulator, an auxiliary regulator, an oil valve, a primary oil-gas heat exchanger and a final oil-gas heat exchanger which are sequentially connected, the main regulator takes the outlet air temperature of the final oil-gas heat exchanger as a set value and collects the real-time outlet air temperature of the final oil-gas heat exchanger for control, and the auxiliary regulator takes the outlet temperature of the primary oil-gas heat exchanger as a set value and takes the oil valve as an auxiliary loop regulator for regulating the outlet temperature of the primary oil-gas heat exchanger.
The oil temperature correction quantity Y (x) is a quadratic equation obtained by fitting according to the outlet oil temperature and outlet gas temperature data, and the outlet temperature of the final-stage oil-gas heat exchanger has an allowable range [ T [) o,min ，T o,max ]，T o,min And T o,max Respectively representing the lowest outlet temperature and the highest outlet temperature when the outlet oil temperature is lower than T o,min When +3, the set value of the air outlet temperature is increased, and when the outlet oil is dischargedTemperature higher than T o，max -3, the outlet gas temperature set point is decreased.
The feedforward controller F (x) of the main regulator is formed by fitting according to the air flow change, the required oil quantity change and the air outlet temperature, and when the air flow is increased or decreased, the corresponding oil quantity is required to be correspondingly increased or decreased to obtain the same air outlet temperature.
And a feedforward controller f (x) of the auxiliary regulator is formed by fitting the variable quantity of the air flow and the required variable quantity of the oil quantity, and when the air flow is increased or reduced, the corresponding oil quantity is required to be correspondingly increased or reduced to obtain the same outlet air temperature.
The compressed air flow correction amount corrects the nonlinearity of the main regulator by converting the controlled object into a linear part and a nonlinear part,
A f (z -1 )y(k+1)＝B f (z -1 )u PID (k)+γ(k) (1)
wherein y (k +1) represents the controlled quantity output at the time of k +1, and γ (k) is a nonlinear part, satisfying
y (k) represents the controlled quantity output at time k,
is the linear model output, u PID (k) Represents the master PID controller output; z is a radical of -1 Is a unit lag operator; a. the f ，B f Is z -1 The polynomial of (c):
a 1 to
And b 0 To
A decomposition coefficient representing a linear model;
the nonlinear master PID controller is represented as:
u PID (k)＝u PID (k-1)+K P [e(k)-e(k-1)] +K I e(k)+K D [e(k)-2e(k-1)+e(k-2)]+K no γ(k) (3)
K I 、K P 、K D and K no Respectively representing integral, proportional, differential and nonlinear components of the main PID controller, and e (k) representing controlled quantity deviation;
e (k) is equal to y set (k) Substituting y (k) into equation (3) yields:
wherein, y set (k) The setting value of the controlled quantity is shown,
an oil-gas temperature control system for a compressed air energy storage system comprises a cascade control loop, an oil temperature correction module and a compressor air flow correction module, wherein the cascade control loop comprises a main regulator, an auxiliary regulator, an oil valve, a primary oil-gas heat exchanger and a final oil-gas heat exchanger which are sequentially connected, the main regulator regulates the outlet temperature of the final oil-gas heat exchanger, the auxiliary regulator regulates the outlet temperature of the primary oil-gas heat exchanger through the oil valve, the oil temperature correction module is used for introducing an oil temperature correction into the cascade control loop, and the compressor air flow correction module is used for introducing a compressor air flow correction into the cascade control loop.
The invention has the beneficial effects that: the invention provides an oil-gas temperature control method and system for a compressed air energy storage system, which fill the vacancy of the temperature control method of the existing multi-stage compressor and multi-stage heat exchanger, when the outlet temperature of the last stage oil-gas heat exchanger deviates from a set value, the last stage oil-gas heat exchanger can be quickly corrected back by adjusting an oil valve through a cascade loop, if the oil temperature exceeds the limit in the adjustment process of the oil valve, the set value of the outlet temperature can be adjusted, so that the outlet oil temperature and the outlet temperature are both controlled within a reasonable range, and the controller has a simple structure and is easy to realize. In addition, the invention provides a solution to the nonlinear and thermal inertia problems of the system, the nonlinear problem is solved by a PID method with a nonlinear correction function and the feedforward function correction of the outlet air flow, the thermal inertia of the controlled object is reduced by cascade PID, and the thermal inertia problem is solved by the advance action of the feedforward function.
Drawings
FIG. 1 is a schematic diagram of a method of oil and gas temperature control for a compressed air energy storage system according to the present invention;
FIG. 2 is a control diagram of the temperature of the compressed air stored energy outlet when the control method of the present invention does not reach the temperature limit of the heat transfer oil;
FIG. 3 is a control diagram of the temperature of the compressed air energy storage outlet when the control method of the invention reaches the lower limit of the temperature of the heat transfer oil.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and the following examples are only for clearly illustrating the technical solutions of the present invention, and should not be taken as limiting the scope of the present invention.
As shown in figure 1, the invention discloses an oil-gas temperature control method for a compressed air energy storage system, which is used for the compressed air energy storage system, wherein the compressed air energy storage system comprises a multistage compressor and a multistage oil-gas heat exchanger, the multistage oil-gas heat exchanger comprises a primary compressor, a primary oil-gas heat exchanger, a middle-stage compressor, a final-stage oil-gas heat exchanger and a final-stage compressor in sequence, and the oil volumes of the primary oil-gas heat exchanger and the final-stage oil-gas heat exchanger are the same.
The control method of the invention comprises the following steps:
a cascade control loop is established for controlling the outlet air temperature of the last stage compressor. The cascade control loop comprises a main regulator, an auxiliary regulator, an oil valve, a primary oil-gas heat exchanger and a final oil-gas heat exchanger which are sequentially connected. The main regulator takes the outlet air temperature of the final oil-gas heat exchanger as a set value, collects the real-time outlet air temperature of the final oil-gas heat exchanger for control, and the auxiliary regulator takes the outlet temperature of the primary oil-gas heat exchanger as a set value and takes an oil valve as an auxiliary loop regulator for regulating the outlet temperature of the primary oil-gas heat exchanger. When the outlet temperature of the final-stage oil-gas heat exchanger just deviates from a set value, the controller acts on the secondary loop firstly, the delay time of the secondary loop is short, the inertia is small, the outlet temperature of the primary oil-gas heat exchanger is rapidly adjusted by the oil valve, the outlet problem of the final-stage oil-gas heat exchanger is directly influenced, and the problems of long delay time and large inertia in the process of controlling the outlet temperature of the final-stage heat exchanger by the oil valve can be solved by the loop.
And introducing an oil temperature correction quantity to correct the set value of the outlet air temperature of the final-stage oil-gas heat exchanger in real time. The oil temperature correction quantity Y (x) is a quadratic equation obtained by fitting according to the outlet oil temperature and the outlet gas temperature data, and the outlet temperature of the final-stage oil-gas heat exchanger has an allowable range [ T [) o，min ，T o，max ]，T o，min And T o，max Representing the lowest outlet temperature and the highest outlet temperature, respectively. In the present embodiment, T o，min And T o，max The values were 127 ℃ and 154 ℃, respectively. The outlet temperature of the oil has an allowable range [127, 154 ]]When the oil temperature is lower than 130 ℃, the set value of the air outlet temperature is increased, and when the oil temperature is higher than 151 ℃, the set value of the air outlet temperature is decreased.
The compressor airflow correction amount is introduced to correct the nonlinearity of the main regulator and act as a feed-forward correcting secondary regulator. And the feedforward controller F (x) of the main regulator is formed by fitting according to the variable quantity of the air flow, the variable quantity of the required oil quantity and the temperature of the outlet air. When the temperature of the discharged gas is 180-200 ℃, F (x) is 3x 2 +5.6x +2, x is the gas flow, when the temperature of the gas is 160-180 ℃, F (x) 2x 2 +3.5x + 4. When the air flow is increased or decreased, the corresponding increase or decrease of the oil quantity is needed to obtain the same outlet air temperature.
And the feedforward controller f (x) of the auxiliary regulator is formed by fitting according to the air flow change and the required oil change. (x) 0.8x 2 +1.2x + 0.5. When the air flow is increased or decreased, the corresponding increase or decrease of the oil amount is needed to obtain the same outlet air temperature.
The compressed air flow correction amount corrects the nonlinearity of the main regulator by converting the controlled object into a linear part and a nonlinear part,
A f (z -1 )y(k+1)＝B f (z -1 )u PID (k)+γ(k) (1)
wherein y (k +1) represents the controlled quantity output at the time of k +1, and γ (k) is a nonlinear part, satisfying
y (k) represents the controlled quantity output at time k,
is the output of the linear model u PID (k) Represents the master PID controller output; z is a radical of -1 Is a unit lag operator; a. the f ，B f Is z -1 The polynomial of (c):
a 1 to
And b 0 To
A decomposition coefficient representing a linear model;
the nonlinear master PID controller is represented as:
u PID (k)＝u PID (k-1)+K P [e(k)-e(k-1)] +K I e(k)+K D [e(k)-2e(k-1)+e(k-2)]+K no γ(k) (3)
K I 、K P 、K D and K no Respectively representing integral, proportional, differential and non-linear components of the main PID controller, where K D The compressed air flow is calculated by identification. e (k) represents the controlled quantity deviation;
e (k) is equal to y set (k) Substituting y (k) into equation (3) yields:
wherein, y set (k) The setting value of the controlled quantity is shown,
the invention also discloses an oil-gas temperature control system for the compressed air energy storage system, which comprises a cascade control loop, an oil temperature correction module and a compressor air flow correction module, wherein the cascade control loop comprises a main regulator, an auxiliary regulator, an oil valve, a primary oil-gas heat exchanger and a final oil-gas heat exchanger which are sequentially connected, the main regulator regulates the gas outlet temperature of the final oil-gas heat exchanger, the auxiliary regulator regulates the outlet temperature of the primary oil-gas heat exchanger through the oil valve, the oil temperature correction module is used for introducing an oil temperature correction quantity into the cascade control loop, and the compressor air flow correction module is used for introducing a compressor air flow correction quantity into the cascade control loop.
When the oil gas temperature control method is adopted for control, the control effect shown in the figure 2 can be obtained when the oil temperature limit is not reached. As can be seen from FIG. 2(a), the air temperature of the final heat exchanger can return to the vicinity of the set value within about 250s, and the control is smooth and has no oscillation. As can be seen from fig. 2(b), the flow rate of the heat transfer oil is stabilized at about 150 seconds. When the oil temperature limit is reached, the control effect of fig. 3 can be obtained. It can be seen from fig. 3(a) that the outlet temperature of the final heat exchanger is stable in about 400s, and it can be seen from fig. 3(b) that the outlet temperature of the heat transfer oil is stable in about 400s, and it can be seen from fig. 3(c) that the flow rate of the heat transfer oil is stable in about 300 s.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. An oil gas temperature control method for a compressed air energy storage system is characterized by comprising the following steps: the compressed air energy storage system comprises a multi-stage compressor and a multi-stage oil-gas heat exchanger, and the oil quantity of the primary oil-gas heat exchanger is the same as that of the final oil-gas heat exchanger; establishing a cascade control loop for controlling an outlet air temperature of a last stage compressor of a compressed air energy storage system, the method comprising:
introducing the oil temperature correction quantity into the established cascade control loop to correct the set value of the outlet air temperature of the final-stage oil-gas heat exchanger in real time;
a compressor airflow modifier is introduced into the established cascade control loop to modify the primary regulator nonlinearity and act as a feed forward modified secondary regulator.
2. The method for controlling the oil and gas temperature of the compressed air energy storage system according to claim 1, wherein the method comprises the following steps: the compressed air energy storage system sequentially comprises a primary compressor, a primary oil-gas heat exchanger, a middle-stage compressor, a final-stage oil-gas heat exchanger and a final-stage compressor.
3. The method of claim 1, wherein the method comprises the steps of: the cascade control loop comprises a main regulator, an auxiliary regulator, an oil valve, a primary oil-gas heat exchanger and a final oil-gas heat exchanger which are sequentially connected, the main regulator takes the outlet air temperature of the final oil-gas heat exchanger as a set value and collects the real-time outlet air temperature of the final oil-gas heat exchanger for control, and the auxiliary regulator takes the outlet temperature of the primary oil-gas heat exchanger as a set value and takes the oil valve as an auxiliary loop regulator for regulating the outlet temperature of the primary oil-gas heat exchanger.
4. The method of claim 1, wherein the method comprises controlling the temperature of the compressed air in the compressed air energy storage system: the oil temperature correction quantity Y (x) is a quadratic equation obtained by fitting according to the outlet oil temperature and outlet gas temperature data, and the outlet temperature of the final-stage oil-gas heat exchanger has an allowable range [ T [) o,min ，T o,max ]，T o,min And T o,max Respectively representing the lowest outlet temperature and the highest outlet temperature when the outlet oil temperature is lower than T o,min When the temperature is +3, the set value of the air outlet temperature is increased, and when the temperature of the outlet oil is higher than T o,max -3, the outlet gas temperature set point is decreased.
5. The method of claim 1, wherein the method comprises the steps of: and a feedforward controller F (x) of the main regulator is formed by fitting according to the air flow variable quantity, the required oil quantity variable quantity and the air outlet temperature, and when the air flow is increased or decreased, the corresponding oil quantity is correspondingly increased or decreased to obtain the same air outlet temperature.
6. The method of claim 1, wherein the method comprises the steps of: and a feedforward controller f (x) of the auxiliary regulator is formed by fitting according to the variation of the air flow and the variation of the required oil quantity, and when the air flow is increased or decreased, the corresponding oil quantity is correspondingly increased or decreased to obtain the same outlet air temperature.
7. The method of claim 1, wherein the method comprises the steps of: the nonlinearity of the master regulator is corrected by converting the controlled object into a linear part and a nonlinear part,
A f (z -1 )y(k+1)＝B f (z -1 )u PID (k)+γ(k) (1)
wherein y (k +1) represents the controlled quantity output at the time of k +1, and γ (k) is a nonlinear part, satisfying
y (k) represents the controlled quantity output at time k,
is the output of the linear model u PID (k) Represents the master PID controller output; z is a radical of -1 Is a unit lag operator; a. the f ,B f Is z -1 The polynomial of (c):
a 1 to
And b 0 To
A decomposition coefficient representing a linear model;
the nonlinear master PID controller is represented as:
u PID (k)＝u PID (k-1)+K P [e(k)-e(k-1)]+K I e(k)+K D [e(k)-2e(k-1)+e(k-2)]+K no γ(k) (3)
K I 、K P 、K D and K no Respectively representing integral, proportional, differential and nonlinear components of the main PID controller, and e (k) representing controlled quantity deviation;
e (k) is equal to y set (k) By substituting y (k) into equation (3), we can obtain:
wherein, y set (k) The setting value of the controlled quantity is shown,
8. the utility model provides an oil gas temperature control system for compressed air energy storage system which characterized in that: the cascade control system comprises a cascade control loop, an oil temperature correction module and a compressor air flow correction module, wherein the cascade control loop comprises a main regulator, an auxiliary regulator, an oil valve, a primary oil-gas heat exchanger and a final oil-gas heat exchanger which are sequentially connected, the main regulator regulates the outlet temperature of the final oil-gas heat exchanger, the auxiliary regulator regulates the outlet temperature of the primary oil-gas heat exchanger through the oil valve, the oil temperature correction module is used for introducing an oil temperature correction quantity into the cascade control loop, and the compressor air flow correction module is used for introducing a compressor air flow correction quantity into the cascade control loop.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116149401A (en) * | 2023-04-19 | 2023-05-23 | 中能建数字科技集团有限公司 | System and method for controlling outlet temperature of heat exchanger of compressed air energy storage power station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116149401A (en) * | 2023-04-19 | 2023-05-23 | 中能建数字科技集团有限公司 | System and method for controlling outlet temperature of heat exchanger of compressed air energy storage power station |
| CN116149401B (en) * | 2023-04-19 | 2023-09-05 | 中能建数字科技集团有限公司 | System and method for controlling outlet temperature of heat exchanger of compressed air energy storage power station |
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