CN111522365B - Method and system for regulating and controlling steam extraction flow in multi-unit combined heat supply mode - Google Patents
Method and system for regulating and controlling steam extraction flow in multi-unit combined heat supply mode Download PDFInfo
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- CN111522365B CN111522365B CN202010361620.3A CN202010361620A CN111522365B CN 111522365 B CN111522365 B CN 111522365B CN 202010361620 A CN202010361620 A CN 202010361620A CN 111522365 B CN111522365 B CN 111522365B
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D7/06—Control of flow characterised by the use of electric means
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Abstract
The application discloses a method and a system for regulating and controlling steam extraction flow in a multi-unit combined heat supply mode, wherein the method comprises the following steps: collecting unit parameters of each unit for combined heat supply; calculating the load increase and decrease adjustable space of each unit according to the unit parameters; determining the steam extraction flow value to be adjusted according to the load increase and decrease adjustable space and the unit operation mode of each unit; and adjusting and distributing the extraction flow of each unit according to the extraction flow value to be adjusted. The system comprises: the device comprises a unit parameter acquisition module, an analysis calculation module and an adjustment module. Through the method and the device, the load adjusting space of the units can be effectively improved, the steam extraction flow between the units can be reasonably allocated, the heat supply quality can be guaranteed, the AGC performance index of the units can be guaranteed, and therefore the accuracy and the stability of the operation of a power grid are guaranteed.
Description
Technical Field
The application relates to the technical field of multi-unit combined heat supply, in particular to a method and a system for regulating and controlling steam extraction flow in a multi-unit combined heat supply mode.
Background
With the enlargement of the urban scale, the corresponding heating demand is continuously increased, and large-scale central heating is the main trend of the current heating industry development. In order to ensure the stability of a heat supply source, most heat supply units adopt a 'heat-to-power' operation mode, and the power generation load is influenced by the heat supply extraction flow, so that the power generation load regulation range and speed of the units are greatly limited. With the large-scale thermoelectric unit being put into heat supply and steam extraction operation, the load regulation capacity of the power grid is greatly attenuated, and adverse effects are generated on the safe operation of the power grid. The power generation load adjusting range of a typical steam extraction type unit under a non-heat supply working condition is 50% -100%, and after the unit is put into heat supply operation, the power generation load adjusting range is only 60% -80%. And for the backpressure unit, the generating load adjusting capacity is basically lost under the heating working condition. In order to ensure the stable operation of the power system, the frequency of the power grid must be controlled within an allowable range around 50Hz when the power system is operated, otherwise the quality of the power of the system is reduced. Therefore, how to regulate and control the power generation of the units is an important problem in a multi-unit combined heat supply mode.
At present, an AGC (Automatic Generation Control) system is usually used to regulate and Control a power grid, and the AGC system is an Automatic integrated Control system for realizing real-time balance between generated power and load of a power system and ensuring that the frequency of the power grid and exchange power of a tie line are maintained at specified values. Large thermal power generating units all require the introduction of an Automatic Generation Control (AGC) function. The power grid AGC divides each unit to bear a power regulation mode into: an Off-regulated mode, namely that the unit does not bear the power regulation under any condition, namely that the unit tracks a planned output curve issued by a power grid and changes more smoothly; the R (Regulated) mode is that the unit unconditionally undertakes to adjust the power under any condition of need, the power of the unit changes frequently, and the change space is large. The AGC system regulation principle can refer to the network source AGC coordination control schematic diagram of fig. 1. As shown in fig. 1, the current AGC Control system mainly calculates ACE (Area Control Error) according to the grid frequency and the tie line power flow, and after the ACE is generated, the ACE is distributed to each AGC set according to a certain mechanism to jointly act to eliminate the deviation, so as to achieve the stability of the grid frequency.
The existing AGC regulation and control method usually adopts an R mode, because a unit in the R mode needs to carry out random load regulation according to the regional control deviation ACE, the load fluctuates in a certain range, if the steam extraction flow of the unit is too large at the moment, the requirement of a power grid cannot be met when the load is increased, the AGC evaluation index does not reach the standard, and the safety of the power grid and the power quality are influenced. In addition, the allowable fluctuation range of the load in the current AGC regulation and control method is narrow, so that the operation stability of the power grid is poor.
Disclosure of Invention
The application provides a method and a system for regulating and controlling steam extraction flow in a multi-unit combined heat supply mode, and aims to solve the problems that the AGC regulation and control method in the prior art reduces the quality of electric energy and the running stability of a power grid is poor.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
a method for regulating and controlling steam extraction flow rate in a multi-unit combined heat supply mode comprises the following steps:
the method comprises the following steps of collecting unit parameters of each unit for combined heat supply, wherein the unit parameters comprise: the method comprises the following steps of (1) setting a set rated load, a set actual load, a set minimum stable combustion load, a set steam extraction flow, a set operation mode and an R mode single AGC (automatic gain control) adjustment step length;
calculating the load increase and decrease adjustable space of each unit according to the unit parameters;
determining the steam extraction flow value to be adjusted according to the load increase and decrease adjustable space and the unit operation mode of each unit, wherein the unit operation mode comprises the following steps: an O mode and an R mode;
and adjusting and distributing the extraction flow of each unit according to the extraction flow value to be adjusted.
Optionally, the method for calculating the load increase and decrease adjustable space of each unit according to the unit parameters includes:
according to the rated load of any unit, the load corresponding to the steam extraction flow of the unit and the actual load of the unit, a formula delta P is utilized I ＝P H -P A Load increase of computer group adjustable space, wherein P H ＝P N -P E ，P H For adjustable upper limit of load, P, of the unit N For rated load of the unit, P A For the actual load of the unit, P E The load corresponding to the steam extraction flow of the unit;
according to the lowest stable combustion load of the unit, the load corresponding to the steam extraction flow of the unit and the actual load of the unit, a formula delta P is utilized D ＝P A -P L Load reduction of computer group adjustable space, wherein P L ＝P C +P E ，P L For a set adjustable load lower limit, P C The lowest stable combustion load of the unit.
Optionally, the minimum steady combustion load value of the unit is as follows: p C ＝(30％-50％)*P N 。
Optionally, the method for determining the extraction flow value to be adjusted according to the load increase and decrease adjustable space and the unit operation mode of each unit includes:
determining a unit operation mode of each unit;
when the unit operation mode is the O mode, determining the value which can be increased by the extraction flow of the unit according to the steam flow value corresponding to the load increase adjustable space of the unit;
when the unit operation mode is an R mode, determining a smaller value between the load increase adjustable space and the load decrease adjustable space of the unit;
judging whether the smaller value is larger than a set AGC adjustment space value or not;
if so, the extraction flow is not adjusted;
if not, determining P 0 -Min(ΔP I ,ΔP D ) Matched steam flow value, wherein P 0 Adjusting the space value for the set AGC;
and determining the steam flow value as an extraction steam flow value to be adjusted.
Optionally, the set AGC adjustment space value is n R-mode single AGC adjustment step sizes, where n is a natural number.
Optionally, the method for adjusting and allocating the extraction flow of each unit according to the extraction flow value to be adjusted includes:
determining a unit operation mode of each unit;
when the unit operation mode is the O mode, the steam extraction flow of each unit is adjusted according to the steam extraction flow increasing value of the unit;
when the unit operation mode is an R mode, determining an O mode unit with an adjustment space in each unit;
judging whether the increasable value of the steam extraction flow of the O-mode unit is more than or equal to the value of the steam extraction flow to be adjusted;
if yes, averagely distributing the extraction flow value to be adjusted to the O-mode unit;
if not, an alarm is given.
A regulation and control system for extraction flow under a multi-unit combined heat supply mode comprises:
the unit parameter acquisition module is used for acquiring unit parameters of each unit for combined heat supply, and the unit parameters comprise: the method comprises the following steps of (1) setting a set rated load, a set actual load, a set minimum stable combustion load, a set steam extraction flow, a set operation mode and an R mode single AGC (automatic gain control) adjustment step length;
the analysis and calculation module is used for calculating the load increase and decrease adjustable space of each unit according to the unit parameters, and determining the steam extraction flow value to be adjusted according to the load increase and decrease adjustable space and the unit operation mode of each unit, wherein the unit operation mode comprises the following steps: o mode and R mode;
and the adjusting module is used for adjusting and distributing the steam extraction flow of each unit according to the steam extraction flow value to be adjusted.
Optionally, the adjusting module includes:
the first unit operation mode determining unit is used for determining the unit operation modes of all the units;
the first adjusting unit is used for adjusting the steam extraction flow of each unit according to the steam extraction flow increasing value of the unit when the unit operation mode is the O mode;
the O-mode unit determining unit is used for determining an O-mode unit with an adjusting space in each unit when the unit operation mode is an R mode;
the first judgment unit is used for judging whether the increasable value of the steam extraction flow of the O-mode unit is larger than or equal to the value of the steam extraction flow to be adjusted;
the second adjusting unit is used for averagely distributing the steam extraction flow value to be adjusted to the O-mode unit when the increasable value of the steam extraction flow of the O-mode unit is larger than or equal to the steam extraction flow value to be adjusted;
and the alarm unit is used for giving an alarm when the steam extraction flow rate increasable value of the O-mode unit is smaller than the steam extraction flow rate value to be adjusted.
Optionally, the analysis calculation module comprises:
a calculation unit for utilizing a formula delta P according to the unit rated load of any one unit, the load corresponding to the unit steam extraction flow and the actual load of the unit I ＝P H -P A ComputingThe load of the unit is increased by an adjustable space, and a formula delta P is utilized according to the lowest stable combustion load of the unit of any unit, the load corresponding to the extraction flow of the unit and the actual load of the unit D ＝P A -P L Load reduction of computer group adjustable space, wherein P H ＝P N -P E ，P H For adjustable upper limit of load, P, of the unit L ＝P C +P E ，P L For a set adjustable load lower limit, P N For rated load of the unit, P A For the actual load of the unit, P E Load, P, corresponding to the extraction flow of the unit C The lowest stable combustion load of the unit is set;
the second unit operation mode determining unit is used for acquiring the unit operation modes of all the units;
the unit steam extraction flow increasable value determining unit is used for determining the steam extraction flow increasable value of the unit according to the steam flow value corresponding to the load increase adjustable space of the unit when the unit operation mode is the O mode;
the smaller value determining unit is used for determining the smaller value between the load increase adjustable space and the load decrease adjustable space of the unit when the unit operation mode is the R mode;
the second judging unit is used for judging whether the smaller value is larger than a set AGC adjustment space value or not;
a steam extraction flow value to be adjusted determining unit used for determining P when the smaller value is less than or equal to the set AGC adjustment space value 0 -Min(ΔP I ,ΔP D ) The matched steam flow value is determined as the extraction steam flow value to be adjusted, wherein P is 0 The spatial value is adjusted for the set AGC.
Optionally, the analysis calculation module comprises: a first subtractor DEV1, a second subtractor DEV2, a third subtractor DEV3, a fourth subtractor DEV4, a fifth subtractor DEV5, an adder ADD, a logical AND unit AND, a multiplier MUL, a small value unit MIN, a comparator CMP, AND an analog quantity selector AXSEL;
a first input end of the fifth subtracter DEV5 is connected with the unit parameter acquisition module and used for acquiring unit steam extraction flow, a second input end of the fifth subtracter DEV5 is connected with the adjustment module and used for acquiring a steam extraction flow adjustment instruction sent by the adjustment module, an output end of the fifth subtracter DEV5 is connected to a second input end of the first subtracter DEV1 through a first function generator F1 (x), an output end of the fifth subtracter DEV5 is also connected to a first input end of the adder ADD through the first function generator F1 (x), and the first function generator F1 (x) is used for converting the unit steam extraction flow into load;
a first input end of the first subtracter DEV1 is connected with the unit parameter acquisition module and used for acquiring a rated load of a unit, and an output end of the first subtracter DEV1 is connected to a first input end of a second subtracter DEV 2;
the second input end of the second subtracter DEV2 is connected with the unit parameter acquisition module and used for acquiring the actual load of a unit, the output end of the second subtracter DEV2 is connected to the first input end of the decimal value calculating unit MIN, the output end of the second subtracter DEV2 is further connected with a third function generator F3 (x), the third function generator F3 (x) is used for converting the output quantity of the second subtracter DEV2 into a value which can be increased by the unit steam extraction flow under an O mode, and the output end of the third function generator F3 (x) is connected to the adjustment module;
a second input end of the adder ADD is connected with the unit parameter acquisition module and used for acquiring the lowest stable combustion load of the unit, and an output end of the adder ADD is connected to a second input end of the third subtracter DEV 3;
a first input end of the third subtracter DEV3 is connected with the unit parameter acquisition module and used for acquiring the actual load of the unit, and an output end of the third subtracter DEV3 is connected to a second input end of the decimal value calculating unit MIN;
the small value calculating unit MIN is used for determining the smaller value between the load increase adjustable space and the load decrease adjustable space of the unit and sending the smaller value to the second input end of the fourth subtracter DEV 4;
the multiplier MUL is used for amplifying the R-mode single AGC adjustment step length acquired by the unit parameter acquisition module by n times and sending the R-mode single AGC adjustment step length amplified by n times to a first input end of a fourth subtracter DEV4, wherein n is a natural number;
the output terminal of the fourth subtractor DEV4 is connected to the first input terminal of the comparator CMP, the output terminal of the fourth subtractor DEV4 is further connected to the first input terminal of the analog quantity selector AXSEL via a second function generator F2 (x), the second function generator F2 (x) is configured to convert the output quantity of the fourth subtractor DEV4 into a corresponding extraction flow;
a second input end of the comparator CMP is set to be constant 0, AND an output end of the comparator CMP is connected to a second input end of the AND logic unit AND;
the analog quantity selector AXSEL is used for determining an extraction flow value to be adjusted of the unit in the R mode, a second input end of the analog quantity selector AXSEL is set to be a constant 0, and an output end of the analog quantity selector AXSEL is connected to the adjusting module;
the logic AND unit AND is used for determining whether steam extraction flow adjustment is performed or not, a first input end of the logic AND unit AND is connected with the unit parameter acquisition module AND is used for acquiring an R-mode unit operation signal, an output end of the logic AND unit AND is connected to a position end of an analog quantity selector AXSEL, AND an output end of the logic AND unit AND is further connected to the adjustment module.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the method comprises the steps of firstly collecting unit parameters of each unit, then calculating load increase and decrease adjustable spaces of each unit according to the collected unit parameters, secondly determining extraction flow values to be adjusted according to the load increase and decrease adjustable spaces and unit operation modes, and finally adjusting and distributing the extraction flow of each unit according to the extraction flow values to be adjusted. The unit parameters collected by the embodiment comprise a unit operation mode and a unit extraction flow, the collection of related unit parameters is more comprehensive and accurate, and the adjustable space and the unit operation mode of each unit are increased or decreased according to the load when the extraction flow value to be adjusted is determined. According to the embodiment, the extraction flow of each unit is adjusted and distributed according to the extraction flow value to be adjusted, namely, the heat supply quality can be ensured, the average value of the ACE in a certain period of time can be ensured to be controlled within a specified range through the AGC, and the stability of the operation of a power grid is improved.
The application also provides a regulation and control system of steam extraction flow under the multi-unit combined heat supply mode, and the system mainly comprises: the unit parameter acquisition module, the analysis calculation module and the adjustment module, the unit parameters acquired by the unit parameter acquisition module include: the method has the advantages that the set rated load, the set actual load, the set minimum stable combustion load, the set steam extraction flow, the set operation mode and the R mode single AGC adjustment step length can be used for collecting related set parameters more comprehensively and accurately. The load increase and decrease adjustable space of each unit can be calculated through the rated load of the unit, the actual load of the unit, the minimum stable combustion load of the unit and the steam extraction flow of the unit, and the analysis and calculation module can reasonably allocate the steam extraction flow between the combined heat supply units according to the actual parameters of the unit when calculating the load increase and decrease adjustable space of each unit, so that the load adjustment space of the unit can be promoted, the AGC performance index of the unit can be ensured, and the safety of a power grid and the quality of electric energy can be improved. In this embodiment, the adjustment module adjusts and distributes the extraction flow of each unit according to the extraction flow value to be adjusted, i.e. the heat supply quality can be ensured, and the average value of the ACE in a certain period of time can be ensured to be controlled within a specified range through the AGC, which is beneficial to improving the stability of the operation of the power grid.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating a network source AGC cooperative deployment control in the prior art;
fig. 2 is a schematic flow chart of a method for regulating and controlling an extraction flow rate in a multi-unit combined heat supply manner according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a system for regulating and controlling a steam extraction flow rate in a multi-unit combined heating mode according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an operating principle of an adjustment module in an embodiment of the present application;
FIG. 5 is a schematic structural diagram of an analysis and computation module according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of another analysis and calculation module in the embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For a better understanding of the present application, embodiments thereof are explained in detail below with reference to the accompanying drawings.
Example one
Referring to fig. 2, fig. 2 is a schematic flow chart of a method for regulating and controlling an extraction flow rate in a multi-unit combined heat supply mode according to an embodiment of the present application. As can be seen from fig. 2, the method for regulating and controlling the extraction flow rate in the multi-unit combined heat supply mode in this embodiment mainly includes the following steps:
s1: and collecting unit parameters of each unit for combined heat supply.
The unit parameters collected in this embodiment include: the method comprises the steps of set rated load, set actual load, set minimum stable combustion load, set steam extraction flow, set operation mode and R mode single AGC adjustment step length.
After the unit parameters are collected, executing the step S2: and calculating the load increase and decrease adjustable space of each unit according to the unit parameters.
The load increase and decrease adjustable space of each unit in the embodiment comprises two types: load increase adjustable space and load decrease adjustable space. Specifically, step S2 includes the following processes:
s21: according to the rated load of any unit, the load corresponding to the extraction flow of the unit and the actual load of the unit, a formula delta P is used I ＝P H -P A The load of the computer set increases the adjustable space.
Wherein, P H ＝P N -P E ，P H For adjustable upper limit of load, P, of the unit N For rated load of the unit, P A For the actual load of the unit, P E The load corresponding to the extraction flow of the unit.
S22: according to the lowest stable combustion load of any unit, the load corresponding to the steam extraction flow of the unit and the actual load of the unit, the formula delta P is utilized D ＝P A -P L The load of the computer set is reduced by an adjustable space.
Wherein, P L ＝P C +P E ，P L For adjustable load lower limit, P, of the unit C The minimum stable combustion load of the unit is determined according to the minimum stable combustion test of the unit, and the minimum stable combustion load value of the unit in the embodiment is as follows: p C ＝(30％-50％)*P N 。
With continued reference to fig. 2, after the load increase/decrease adjustable space of each unit is calculated, step S3 is executed: according to the load increase and decrease adjustable space and the unit operation mode of each unit, determining the steam extraction flow value to be adjusted, wherein the unit operation mode comprises the following steps: o mode and R mode.
The mode that each unit bears the regulated power is divided into by the power grid AGC: the system comprises an O mode and an R mode, wherein the O mode is an Off-regulated mode, which means that the unit does not undertake the task of adjusting power under any condition, namely the unit tracks a planned output curve issued by a power grid, and the change is smooth; the R mode, namely the Regulated mode, refers to the task that the unit unconditionally undertakes power regulation under any required condition, and the unit power changes frequently and has a large change space.
Specifically, step S3 includes the following processes:
s31: and determining the unit operation mode of each unit.
That is, whether the operation mode of each unit is the O mode or the R mode is determined.
When the unit operation mode is the O mode, step S32 is executed: and determining the increasable value of the extraction flow of the unit according to the steam flow value corresponding to the load increase adjustable space of the unit.
When the unit operation mode is the O mode, the value of the increased steam extraction flow of the unit is obtained according to the step S32, in this embodiment, the value of the increased steam extraction flow of the unit in the O mode is an adjustable space Δ P added to the unit load I The corresponding steam flow value. In this embodiment, the corresponding functional relationship between the unit load and the steam flow rate may be determined according to a ratio of the rated capacity of the unit to the rated steam flow rate.
When the unit operation mode is the R mode, step S33 is executed: and determining the smaller value between the load increase adjustable space and the load decrease adjustable space of the unit.
The smaller value between the load increase adjustable space and the load decrease adjustable space of the unit in this embodiment is denoted as Min (Δ P) I ,ΔP D )。
S34: and judging whether the smaller value is larger than the set AGC adjustment space value or not.
Set AGC adjusted space value P 0 Can be based on n RThe mode single AGC adjustment step is determined, that is, n AGC adjustment steps in R mode, that is, P 0 ＝n*ΔP S N is a natural number, Δ P S And adjusting the step size for the R mode single AGC. Wherein n is determined according to the regional control deviation and the number of the R mode units.
If the smaller value is larger than the set AGC adjustment space value, judging that the triggering condition of the steam extraction flow adjustment is met, and executing a step S35: determining P 0 -Min(ΔP I ,ΔP D ) The matched steam flow value.
S36: and determining the steam flow value as the steam extraction flow value to be adjusted.
As can be seen from the above steps S31 to S36, in this embodiment, different operations are performed according to different unit operation modes. When the unit operation mode is the O mode, the increased value of the extraction steam flow of the unit is only required to be taken; when the unit operation mode is the R mode, whether the unit meets the triggering condition of the extraction flow adjustment needs to be judged, and the extraction flow value to be adjusted is output only when the triggering condition of the extraction flow adjustment is met. The trigger conditions in this embodiment are: the adjustable space of unit load can not satisfy the condition and the unit operates in R mode, and the judgement condition whether the adjustable space of unit load satisfies the requirement is: adjustable space delta P for increasing unit load I Adjustable space delta P for reducing load of unit D The smaller value between the values is larger than the preset AGC adjustment space value. That is, the adjustable space Δ P is increased when the load of the unit is increased I Adjustable space delta P for reducing load of unit D When the smaller value is larger than the preset AGC adjustment space value, the unit load adjustable space is judged to meet the conditions, the triggering conditions of steam extraction flow adjustment are not met, and the steam extraction flow value to be adjusted is not output. Only when the load of the unit increases by the adjustable space Δ P I Adjustable space delta P for reducing load of unit D When at least one value is less than or equal to the preset AGC adjusting space value, the unit load adjustable space is judged not to meet the conditions, and when the unit operates in the R mode, the triggering conditions of steam extraction flow adjustment are judged to be met, and the steam extraction flow value to be adjusted is output.
S4: and adjusting and distributing the extraction flow of each unit according to the extraction flow value to be adjusted.
Specifically, step S4 includes:
s41: and determining the unit operation mode of each unit.
When the unit operation mode is the O mode, step S42 is executed: and adjusting the steam extraction flow of each unit according to the steam extraction flow increasing value of the unit.
When the unit operation mode is the R mode, step S43 is executed: and determining the O-mode units with the adjusting space in each unit.
S44: and judging whether the increasable value of the steam extraction flow of the O-mode unit is more than or equal to the value of the steam extraction flow to be adjusted.
If the increasable value of the steam extraction flow of the O-mode unit is larger than or equal to the value of the steam extraction flow to be adjusted, executing the step S45: and averagely distributing the extraction flow value to be adjusted to an O-mode unit.
If the increased value of the extraction steam flow of the O-mode unit is smaller than the value of the extraction steam flow to be adjusted, executing the step S46: and sending out an alarm.
From the above steps S41 to S46, when the R-mode unit satisfies the extraction flow adjustment triggering condition, the R-mode unit retrieves the extraction flow to be adjusted, and equally distributes the extraction flow value to be adjusted to the O-mode unit with an adjustment space for combined heat supply, and if the increased extraction flow value of the O-mode unit is smaller than the extraction flow value to be adjusted, an alarm signal is sent to notify the operator to perform corresponding processing.
Example two
Referring to fig. 3 based on the embodiment shown in fig. 2, fig. 3 is a schematic structural diagram of a system for regulating and controlling an extraction flow rate in a multi-unit combined heating mode according to an embodiment of the present application. As can be seen from fig. 3, the regulating system in this embodiment mainly includes: the device comprises a unit parameter acquisition module, an analysis calculation module and an adjustment module. Wherein, unit parameter acquisition module is used for gathering the unit parameter of each unit of joint heating, and the unit parameter includes: the method comprises the steps of set rated load, set actual load, set minimum stable combustion load, set steam extraction flow, set operation mode and R mode single AGC adjustment step length. The analysis and calculation module is used for calculating the load increase and decrease adjustable space of each unit according to the unit parameters, and determining the steam extraction flow value to be adjusted according to the load increase and decrease adjustable space and the unit operation mode of each unit, wherein the unit operation mode comprises the following steps: o mode and R mode. And the adjusting module is used for adjusting and distributing the steam extraction flow of each unit according to the steam extraction flow value to be adjusted.
Further, the adjusting module in this embodiment includes: the device comprises a first unit operation mode determining unit, a first adjusting unit, an O-mode unit determining unit, a first judging unit, a second adjusting unit and an alarming unit. The first unit operation mode determining unit is used for determining the unit operation modes of all the units. And the first adjusting unit is used for adjusting the steam extraction flow of each unit according to the increased value of the steam extraction flow of the unit when the unit operation mode is the O mode. And the O-mode unit determining unit is used for determining the O-mode units with the adjusting space in each unit when the unit operation mode is the R mode. And the first judgment unit is used for judging whether the increasable value of the steam extraction flow of the O-mode unit is more than or equal to the value of the steam extraction flow to be adjusted. And the second adjusting unit is used for averagely distributing the extraction flow value to be adjusted to the O-mode unit when the increasable value of the extraction flow of the O-mode unit is larger than or equal to the extraction flow value to be adjusted. And the alarm unit is used for giving an alarm when the steam extraction flow rate increasable value of the O-mode unit is smaller than the steam extraction flow rate value to be adjusted. The working principle of the adjusting module in this embodiment is shown in fig. 4.
The analysis and calculation module in this embodiment has two structural forms, and the structural form of the first analysis and calculation module is shown in fig. 5. As can be seen from fig. 5, the analysis calculation module includes: the device comprises a calculation unit, a second unit operation mode determination unit, a unit steam extraction flow increasable value determination unit, a smaller value determination unit, a second judgment unit and a steam extraction flow value to be adjusted determination unit.
Wherein, the calculation unit is used for utilizing a formula delta P according to the rated load of the unit, the load corresponding to the steam extraction flow of the unit and the actual load of the unit I ＝P H -P A Load increase of computer groupAdding adjustable space, and according to the lowest stable combustion load of any unit, the load corresponding to the steam extraction flow of the unit and the actual load of the unit, utilizing a formula delta P D ＝P A -P L Load reduction of computer group adjustable space, wherein P H ＝P N -P E ，P H For an adjustable upper limit load, P, of the unit L ＝P C +P E ，P L For a set adjustable load lower limit, P N For rated load of the unit, P A For the actual load of the unit, P E Load, P, corresponding to the extraction flow of the unit C The lowest stable combustion load of the unit. And the second unit operation mode determining unit is used for acquiring the unit operation modes of all the units. And the unit steam extraction flow increasable value determining unit is used for determining the increasable value of the steam extraction flow of the unit according to the steam flow value corresponding to the load increase adjustable space of the unit when the unit operation mode is the O mode. And the smaller value determining unit is used for determining the smaller value between the load increase adjustable space and the load decrease adjustable space of the unit when the unit operation mode is the R mode. And the second judgment unit is used for judging whether the smaller value is larger than the set AGC adjustment space value. A steam extraction flow value to be adjusted determining unit used for determining P when the smaller value is less than or equal to the set AGC adjusting space value 0 -Min(ΔP I ,ΔP D ) The matched steam flow value is determined as the extraction steam flow value to be adjusted, wherein P 0 Adjusting spatial values for a set AGC
Fig. 6 shows that another structure of a calculation and analysis module in this embodiment is shown in fig. 6, and as can be seen from fig. 6, the calculation and analysis module mainly includes: a first subtractor DEV1, a second subtractor DEV2, a third subtractor DEV3, a fourth subtractor DEV4, a fifth subtractor DEV5, an adder ADD, a logical AND unit AND, a multiplier MUL, a calculus unit MIN, a comparator CMP, AND an analog quantity selector AXSEL.
As shown in fig. 6, in this embodiment, a first input end of a fifth subtractor DEV5 is connected to the unit parameter acquisition module and configured to obtain a unit extraction steam flow, a second input end of the fifth subtractor DEV5 is connected to the adjustment module and configured to obtain an extraction steam flow adjustment command sent by the adjustment module, an output end of the fifth subtractor DEV5 is connected to a second input end of the first subtractor DEV1 through a first function generator F1 (x), an output end of the fifth subtractor DEV5 is further connected to a first input end of the adder ADD through the first function generator F1 (x), and the first function generator F1 (x) is configured to convert the unit extraction steam flow into a load.
The first input end of the first subtracter DEV1 is connected with the unit parameter acquisition module and used for acquiring the rated load of the unit, and the output end of the first subtracter DEV1 is connected to the first input end of the second subtracter DEV 2. The second input of second subtractor DEV2 is connected with unit parameter acquisition module for obtain unit actual load, the output of second subtractor DEV2 is connected to the first input of asking for decimal unit MIN, the output of second subtractor DEV2 still is connected with third function generator F3 (x), third function generator F3 (x) are used for converting the output of second subtractor DEV2 into the volume of group steam extraction flow value that can increase under the O mode, the output of third function generator F3 (x) is connected to the adjustment module. The second input end of the adder ADD is connected with the unit parameter acquisition module and used for acquiring the lowest stable combustion load of the unit, and the output end of the adder ADD is connected to the second input end of the third subtracter DEV 3. The first input of third subtractor DEV3 is connected with unit parameter acquisition module for obtain unit actual load, the output of third subtractor DEV3 is connected to the second input of asking decimal value unit MIN. And the small value calculating unit MIN is used for determining the smaller value between the load increase adjustable space and the load decrease adjustable space of the unit and sending the smaller value to the second input end of the fourth subtracter DEV 4.
And the multiplier MUL is used for amplifying the R-mode single AGC adjustment step length acquired by the unit parameter acquisition module by n times and sending the R-mode single AGC adjustment step length amplified by n times to a first input end of a fourth subtracter DEV4, wherein n is a natural number. The output terminal of the fourth subtractor DEV4 is connected to the first input terminal of the comparator CMP, the output terminal of the fourth subtractor DEV4 is further connected to the first input terminal of the analog quantity selector AXSEL via a second function generator F2 (x), and the second function generator F2 (x) is configured to convert the output quantity of the fourth subtractor DEV4 into a corresponding extraction flow quantity. The second input terminal of the comparator CMP is set to constant 0 AND the output terminal of the comparator CMP is connected to the second input terminal of the AND logic unit AND. And the analog quantity selector AXSEL is used for determining the steam extraction flow value to be adjusted of the unit in the R mode, the second input end of the analog quantity selector AXSEL is set to be a constant 0, and the output end of the analog quantity selector AXSEL is connected to the adjusting module. The device comprises a logic AND unit AND used for determining whether steam extraction flow adjustment is performed or not, wherein a first input end of the logic AND unit AND is connected with a unit parameter acquisition module AND used for acquiring an R mode unit operation signal, an output end of the logic AND unit AND is connected to a position end of an analog quantity selector AXSEL, AND an output end of the logic AND unit AND is also connected to an adjustment module.
The working process and the working principle of the regulation and control system for the extraction flow rate in the multi-unit combined heat supply mode in this embodiment are described below by taking a certain power plant in the power grid in the north China area as an example.
The regional control deviation set by the power grid is +/-120MW, and the R-mode single AGC adjustment step length delta P of a 300MW unit S For 3MW, the total number of R-mode units to be used daily is 19 or 20, and the adjustment range of each unit in a single time is 120 ÷ 20=6MW, that is, a load adjustment space of 6MW needs to be reserved in the unit, so the value of n here should be n =6 ÷ 3=2.
The plant jointly supplies heat for 2 300MW units of the same type, and only one unit is put into the R mode to operate at each time. Rated load P of unit N =300MW, minimum stable combustion load P of unit C At 45% rated load, i.e. P C =45% × 300=135mw. The rated steam flow of the unit is 1026t/h, and the conversion between the steam flow and the load is shown in the table 1.
| Steam flow (t/h) | Load (MW) |
| 0 | 0 |
| 1026 | 300 |
TABLE 1 steam flow and load conversion TABLE
And (3) the #1 unit is put into the R mode to operate at a certain moment in a certain day in 12 months, and the #2 unit is operated in the O mode.
The actual load of the #1 unit at the moment is 235MW, the steam extraction flow is 210t/h, and the reduced load is
The upper limit value of the unit adjustable load output by the subtracter DEV1 is P H ＝P N -P E =300-61.4=238.6MW, and the lower limit value of the adjustable load of the unit output by the adder ADD is P L ＝P C +P E =135+61.4=196.4mw, and the unit load increase adjustable space output by the subtractor DEV2 is Δ P I ＝P H -P A =238.6-235=3.6mw, and the unit load reduction adjustable space output by the subtractor DEV3 is Δ P I ＝P A -P L =235-196.4=38.6mw, the output of the minifying module MIN is MIN (Δ P) I ,ΔP D ) =3.6MW. The first input end X1 of the minification module MIN has a value n X Δ P S If =2 × 3=6mw, the output of the subtractor DEV4 is 6-3.6=2.4mw, AND the value is sent to the comparator CMP, AND compared with 0, because the value is greater than 0, the output of the comparator CMP is a high level signal "1", because the #1 unit is in R mode operation at this time, both input ends of the AND logic module AND are high level signals "1", AND the output of the AND logic module AND is a high level signal "1", that is, the adjustment AND distribution module #1 unit is informed of the need of flow adjustment; at the same time, since the set terminal S of the analog quantity selector AXSEL is at high level "1", the value X1 at the first input terminal is outputted, which is ^ greater or greater>
Namely, the extraction flow of 8.2t/h needs to be adjusted.
The actual load of the #2 unit at the moment is 215MW, the steam extraction flow is 218t/h, and the reduced load is
The upper limit value of the unit adjustable load output by the subtracter DEV1 is P H ＝P N -P E =300-63.7=236.3MW, and the lower limit value of the unit adjustable load output by the adder ADD is P L ＝P C +P E =135+63.7=198.7mw, and the unit load increase adjustable space output by subtractor DEV2 is Δ P I ＝P H -P A =236.3-215=21.3mw, and the unit load reduction adjustable space output by the subtractor DEV3 is Δ P I ＝P A -P L =215-198.7=16.3mw. At this time, the #2 unit operates in the O mode, so the first input terminal Z1 of the AND logic block AND is the low level signal "0", AND the output of the AND logic block AND is the low level signal "0", so as to inform the adjustment AND distribution block #2 unit that the flow adjustment is not required. The unit load increase adjustable space output by the subtracter DEV2 is converted into an O-mode unit steam extraction increasable value through a function F3 (x), and the value is ^ and ^>
Namely, the maximum extraction steam flow can be increased by 55.7 t/h.
The adjustment and distribution module carries out flow adjustment signals '1' according to the acquired requirement of the #1 unit, the steam extraction flow of the #1 unit to be adjusted is 8.2t/h, the steam extraction of the #2 unit can be increased by 55.7t/h, as the 8.2-to-55.7-short-to-55.7, a steam flow adjustment instruction of the #1 unit is sent, and a steam flow adjustment instruction of the #2 unit is sent, namely, the steam extraction flow is reduced by 8.2 for the #1 unit through a subtracter DEV5, and the steam extraction flow is increased by 8.2 for the #2 unit, so that the load adjustment space of the #1 unit is ensured, the stability of the whole steam extraction flow of the combined heat supply unit is ensured, and the AGC performance index and the heat supply quality are ensured to meet the requirements.
For parts of this embodiment that are not described in detail, reference may be made to the first embodiment shown in fig. 2, and the two embodiments may be referred to each other, which is not described herein again.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A method for regulating and controlling the extraction flow rate in a multi-unit combined heat supply mode is characterized by comprising the following steps:
the method comprises the following steps of collecting unit parameters of each unit for combined heat supply, wherein the unit parameters comprise: the method comprises the following steps of (1) setting a set rated load, a set actual load, a set minimum stable combustion load, a set steam extraction flow, a set operation mode and an R mode single AGC (automatic gain control) adjustment step length;
calculating the load increase and decrease adjustable space of each unit according to the unit parameters;
determining the steam extraction flow value to be adjusted according to the load increase and decrease adjustable space and the unit operation mode of each unit, wherein the unit operation mode comprises the following steps: an O mode and an R mode;
adjusting and distributing the steam extraction flow of each unit according to the steam extraction flow value to be adjusted;
the method for calculating the load increase and decrease adjustable space of each unit according to the unit parameters comprises the following steps:
according to the rated load of any unit, the load corresponding to the steam extraction flow of the unit and the actual load of the unit, a formula delta P is utilized I ＝P H -P A Load increase of computer group adjustable space, wherein P H ＝P N -P E ，P H For an adjustable upper limit load, P, of the unit N For rated load of the unit, P A For the actual load of the unit, P E For the steam extraction flow of the unitA corresponding load;
according to the lowest stable combustion load of the unit, the load corresponding to the steam extraction flow of the unit and the actual load of the unit, a formula delta P is utilized D ＝P A -P L Load reduction of computer group adjustable space, wherein P L ＝P C +P E ，P L For adjustable load lower limit, P, of the unit C The lowest stable combustion load of the unit is set;
the method for determining the extraction flow value to be adjusted according to the load increase and decrease adjustable space and the unit operation mode of each unit comprises the following steps:
determining a unit operation mode of each unit;
when the unit operation mode is the O mode, determining the value which can be increased by the extraction flow of the unit according to the steam flow value corresponding to the load increase adjustable space of the unit;
when the unit operation mode is an R mode, determining a smaller value between the load increase adjustable space and the load decrease adjustable space of the unit;
judging whether the smaller value is larger than a set AGC adjustment space value or not;
if so, the extraction flow is not adjusted;
if not, determining P 0 -Min(ΔP I ,ΔP D ) Matched steam flow value, wherein P 0 Adjusting the space value for the set AGC;
and determining the steam flow value as an extraction steam flow value to be adjusted.
2. The method for regulating and controlling the steam extraction flow rate in the multi-unit combined heat supply mode according to claim 1, wherein the minimum stable combustion load value of the unit is as follows: p is C ＝(30％-50％)*P N 。
3. The method for regulating and controlling the extraction flow rate in the multi-unit combined heat supply mode according to claim 1, wherein the set AGC adjustment space value is n R-mode single AGC adjustment step lengths, and n is a natural number.
4. The method for regulating and controlling the extraction flow rate in the multi-unit combined heating mode according to claim 1, wherein the method for regulating and distributing the extraction flow rate of each unit according to the extraction flow rate value to be regulated comprises the following steps:
determining a unit operation mode of each unit;
when the unit operation mode is the O mode, the steam extraction flow of each unit is adjusted according to the steam extraction flow increasing value of the unit;
when the unit operation mode is an R mode, determining an O mode unit with an adjustment space in each unit;
judging whether the increasable value of the steam extraction flow of the O-mode unit is more than or equal to the value of the steam extraction flow to be adjusted;
if yes, averagely distributing the extraction flow value to be adjusted to the O-mode unit;
if not, an alarm is given.
5. A steam extraction flow regulation and control system under a multi-unit combined heat supply mode is characterized by comprising:
the unit parameter acquisition module is used for acquiring unit parameters of each unit for combined heat supply, and the unit parameters comprise: the method comprises the following steps of (1) setting a rated load of a unit, an actual load of the unit, a minimum stable combustion load of the unit, a steam extraction flow of the unit, a unit operation mode and an R mode single AGC (automatic gain control) adjustment step length;
the analysis and calculation module is used for calculating the load increase and decrease adjustable space of each unit according to the unit parameters, and determining the steam extraction flow value to be adjusted according to the load increase and decrease adjustable space and the unit operation mode of each unit, wherein the unit operation mode comprises the following steps: an O mode and an R mode;
the adjusting module is used for adjusting and distributing the extraction flow of each unit according to the extraction flow value to be adjusted;
wherein the analysis calculation module comprises:
a calculation unit for calculating the rated load and steam extraction flow of any unitCorresponding load and actual load of the unit are calculated by using a formula delta P I ＝P H -P A Calculating the load increase adjustable space of the unit, and utilizing a formula delta P according to the lowest stable combustion load of the unit, the load corresponding to the steam extraction flow of the unit and the actual load of the unit D ＝P A -P L Load reduction of computer group adjustable space, wherein, P H ＝P N -P E ，P H For adjustable upper limit of load, P, of the unit L ＝P C +P E ，P L For adjustable load lower limit, P, of the unit N For rated load of the unit, P A For the actual load of the unit, P E Load, P, corresponding to the extraction flow of the unit C The lowest stable combustion load of the unit is set;
the second unit operation mode determining unit is used for acquiring the unit operation modes of all the units;
the unit steam extraction flow increasable value determining unit is used for determining the steam extraction flow increasable value of the unit according to the steam flow value corresponding to the load increase adjustable space of the unit when the unit operation mode is the O mode;
the smaller value determining unit is used for determining the smaller value between the load increase adjustable space and the load decrease adjustable space of the unit when the unit operation mode is the R mode;
the second judging unit is used for judging whether the smaller value is larger than a set AGC adjustment space value or not;
a unit for determining the steam extraction flow value to be adjusted, which is used for determining P when the smaller value is less than or equal to the set AGC adjustment space value 0 -Min(ΔP I ,ΔP D ) The matched steam flow value is determined as the extraction steam flow value to be adjusted, wherein P is 0 The spatial value is adjusted for the set AGC.
6. The system for regulating and controlling the flow rate of extracted steam in a multi-unit combined heating mode according to claim 5, wherein the adjusting module comprises:
the first unit operation mode determining unit is used for determining the unit operation modes of all the units;
the first adjusting unit is used for adjusting the steam extraction flow of each unit according to the steam extraction flow increasing value of the unit when the unit operation mode is the O mode;
the O-mode unit determining unit is used for determining an O-mode unit with an adjusting space in each unit when the unit operation mode is an R mode;
the first judgment unit is used for judging whether the increasable value of the steam extraction flow of the O-mode unit is more than or equal to the value of the steam extraction flow to be adjusted;
the second adjusting unit is used for averagely distributing the steam extraction flow value to be adjusted to the O-mode unit when the increasable value of the steam extraction flow of the O-mode unit is larger than or equal to the steam extraction flow value to be adjusted;
and the alarm unit is used for giving an alarm when the steam extraction flow rate increasable value of the O-mode unit is smaller than the steam extraction flow rate value to be adjusted.
7. The system for regulating and controlling the extraction steam flow rate in the multi-unit combined heating mode according to claim 5 or 6, wherein the analysis and calculation module comprises: a first subtractor (DEV 1), a second subtractor (DEV 2), a third subtractor (DEV 3), a fourth subtractor (DEV 4), a fifth subtractor (DEV 5), an Adder (ADD), a logical AND unit (AND), a Multiplier (MUL), a small value calculating unit (MIN), a Comparator (CMP) AND an analog quantity selector (AXSEL);
a first input end of the fifth subtracter (DEV 5) is connected with the unit parameter acquisition module and used for acquiring unit steam extraction flow, a second input end of the fifth subtracter (DEV 5) is connected with the adjustment module and used for acquiring a steam extraction flow adjustment instruction sent by the adjustment module, an output end of the fifth subtracter (DEV 5) is connected to a second input end of the first subtracter (DEV 1) through a first function generator F1 (x), an output end of the fifth subtracter (DEV 5) is also connected to a first input end of the Adder (ADD) through the first function generator F1 (x), and the first function generator F1 (x) is used for converting the unit steam extraction flow into load capacity;
a first input end of the first subtracter (DEV 1) is connected with the unit parameter acquisition module and used for acquiring a rated load of a unit, and an output end of the first subtracter (DEV 1) is connected to a first input end of a second subtracter (DEV 2);
the second input end of the second subtracter (DEV 2) is connected with a unit parameter acquisition module and used for acquiring the actual load of a unit, the output end of the second subtracter (DEV 2) is connected to the first input end of the small value calculating unit (MIN), the output end of the second subtracter (DEV 2) is further connected with a third function generator F3 (x), the third function generator F3 (x) is used for converting the output quantity of the second subtracter (DEV 2) into a value which can be increased by the unit steam extraction flow under an O mode, and the output end of the third function generator F3 (x) is connected to an adjusting module;
the second input end of the Adder (ADD) is connected with the unit parameter acquisition module and used for acquiring the lowest stable combustion load of the unit, and the output end of the Adder (ADD) is connected to the second input end of the third subtracter (DEV 3);
a first input end of the third subtracter (DEV 3) is connected with a unit parameter acquisition module and used for acquiring the actual load of a unit, and an output end of the third subtracter (DEV 3) is connected to a second input end of the decimal value calculating unit (MIN);
the minimum value calculating unit (MIN) is used for determining the smaller value between the load increase adjustable space and the load decrease adjustable space of the unit and sending the smaller value to the second input end of a fourth subtracter (DEV 4);
the Multiplier (MUL) is used for amplifying the R-mode single AGC adjustment step length acquired by the unit parameter acquisition module by n times, and sending the R-mode single AGC adjustment step length amplified by n times to a first input end of a fourth subtracter (DEV 4), wherein n is a natural number;
the output end of the fourth subtracter (DEV 4) is connected with the first input end of the Comparator (CMP), the output end of the fourth subtracter (DEV 4) is also connected with the first input end of the analog quantity selector (AXSEL) through a second function generator F2 (x), and the second function generator F2 (x) is used for converting the output quantity of the fourth subtracter (DEV 4) into the corresponding steam extraction flow quantity;
a second input terminal of the Comparator (CMP) is set to be constant 0, AND an output terminal of the Comparator (CMP) is connected to a second input terminal of the logical AND unit (AND);
the analog quantity selector (AXSEL) is used for determining an extraction steam flow value to be adjusted of the unit in the R mode, a second input end of the analog quantity selector (AXSEL) is set to be a constant 0, and an output end of the analog quantity selector (AXSEL) is connected to the adjusting module;
the system comprises a logic AND unit (AND) AND an adjusting module, wherein the logic AND unit (AND) is used for determining whether steam extraction flow adjustment is performed or not, a first input end of the logic AND unit (AND) is connected with a unit parameter acquisition module AND is used for acquiring an R-mode unit operation signal, an output end of the logic AND unit (AND) is connected to a setting end of an analog quantity selector (AXSEL), AND an output end of the logic AND unit (AND) is further connected to the adjusting module.
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