CN115854412B - Electric boiler system of heat supply unit of urban power plant - Google Patents
Electric boiler system of heat supply unit of urban power plant Download PDFInfo
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Abstract
The invention provides an electric boiler system of a heating unit of an urban power plant, which comprises: heating unit and set up the electric boiler in heating unit one side, still include: the demand monitoring module is used for monitoring the power grid load demand of the urban power plant, judging whether the heat supply unit runs at full load or not when the power grid load demand is larger than the preset load demand, and if yes, determining a first relation function between a full load running result and the power grid load demand; the relation analysis module is used for controlling the electric boiler to stop running when the first relation function meets the first constraint; when the first relation function meets the second constraint, controlling the electric boiler to operate according to a preset control instruction; and the operation control module is used for controlling the heat supply unit to perform low-load operation when the heat supply unit does not meet the load operation, and simultaneously controlling the electric boiler to perform high-load operation. The electric boilers and the heating units under different conditions are respectively controlled through judging the load demands, so that the demands of power generation and heat supply are effectively met.
Description
Technical Field
The invention relates to the technical field of electric boilers, in particular to an electric boiler system of a heating unit of an urban power plant.
Background
The unit above 330MW grade of urban power plant adopts high back pressure (double back pressure double rotor exchange) circulating water heat supply, which is a high-efficiency heat supply technology rapidly developed in recent years. The heat supply period steam turbine adopts a specially manufactured high back pressure heat supply low pressure rotor, improves the steam exhaust back pressure of the steam turbine, directly connects the outlet and inlet of the condenser circulating cooling water into a heat supply system, and uses the heat supply network circulating water as the condenser circulating cooling water. The circulating water can be heated for the first time by adopting a series two-stage heating system, the circulating water of the heating network firstly passes through a condenser to absorb the latent heat of the exhaust steam of the low-pressure cylinder, then the circulating water is heated for the second time by passing through a steam heater of a heat supply first station to generate high-temperature hot water, the high-temperature hot water is sent to a hot water pipe network to exchange heat with the circulating water of the second-stage heating network by a second-stage heat exchange station, the high-temperature hot water is cooled and then returns to a condenser of a unit to form a complete circulating water path, and the steam source of the heat supply first station can select the local or temporary heat supply steam extraction. The following diagram is the heating scheme system, as shown in fig. 1.
The non-heating period adopts a pure condensing low-pressure rotor, the condenser circulating water is switched to the original circulating cooling water supply state, the steam turbine exhaust parameters are restored to the normal level, and low back pressure is formed, namely, the steam turbine is restored to the operation of the pure condensing working condition.
However, because the high back pressure unit of the urban high-capacity thermal power plant adopts a running mode of using heat to fix electricity, the requirements of power generation and heat supply in the spot market of the power grid can not be met, and the defects are obvious.
Therefore, the invention provides an electric boiler system of a heating unit of an urban power plant.
Disclosure of Invention
The invention provides an electric boiler system of a heating unit of an urban power plant, which is used for respectively controlling an electric boiler and the heating unit under different conditions through judging load demands so as to effectively meet the demands of power generation and heat supply.
The invention provides an electric boiler system of a heating unit of an urban power plant, which comprises: heating unit and set up the electric boiler of heating unit one side still includes:
the demand monitoring module is used for monitoring the power grid load demand of the urban power plant, judging whether the heat supply unit runs at full load or not when the power grid load demand is larger than a preset load demand, and if so, determining a first relation function between a full load running result and the power grid load demand;
the relation analysis module is used for controlling the electric boiler to stop running when the first relation function meets a first constraint;
when the first relation function meets a second constraint, controlling the electric boiler to operate according to a preset control instruction;
the operation control module is used for judging whether the urban power plant needs to consume new energy electric quantity or not when the heat supply unit does not meet the load operation;
if the energy is needed to be absorbed, the heating unit is controlled to perform low-load operation, and meanwhile, the electric boiler is controlled to perform high-load operation.
Preferably, the demand monitoring module includes:
the output load determining unit is used for capturing the outward output loads of the urban power plant at different moments, constructing an output load curve, and obtaining a third curve in a intercepting range, a fourth curve outside an upper intercepting side line and a fifth curve outside a lower intercepting side line by performing second transverse interception on the output load curve;
an average load determining unit configured to obtain a first average load of the third curve, a second average load of the fourth curve, and a third average load of the fifth curve;
acquiring a first difference value c1 between the second average load and the first average load and a second difference value c2 between the first average load and the third average load;
a demand determination unit for taking the first average load as a grid load demand of the urban power plant when s01< c1-c2< s02 and s03< t (y 4) -t (y 5) < s04, wherein s01, s02 represent setting constants for the loads; s03, s04 denote setting constants for time; t (y 4) represents the total time of the fourth curve y 4; t (y 5) represents the total time of the fifth curve y 5;
the power generation load determining unit is used for counting power generation curves of different power generation equipment in the urban power plant when s01< c1-c2< s02 and s03< t (y 4) -t (y 5) < s04 are not met, and according to the equipment type and the equipment standard loss of each power generation equipment, adjusting the corresponding power generation curve y0 according to y1=a1×y0 to obtain a first curve y1, wherein a1 represents an adjustment coefficient obtained based on the equipment type and the equipment standard loss of the corresponding power generation equipment;
the curve intercepting unit is used for intercepting the first curve transversely according to the generating capacity intercepting function to obtain a second curve and further obtaining an exceeding curve exceeding the uppermost transverse line;
the power generation load determining unit is used for determining a first power generation load of the urban power plant according to a second curve of each power generation device, correcting the first power generation load x1 according to a curve relation a2 between an exceeding curve of the same power generation device and the second curve and x1 according to x2=a2 to obtain a second power generation load x2, and taking the second power generation load x2 as a power grid load demand of the urban power plant.
Preferably, the demand monitoring module further includes:
the unit monitoring unit is used for monitoring the current load running value f1 of the heating unit in real time;
when (when)When the heating unit is operating at full load, wherein +.>Representing a full load operating value;
otherwise, judging that the heating unit is not operated under full load.
Preferably, the demand monitoring module further includes:
a relation function establishing unit for establishing a relation function according toDetermining a full load level b1 of said full load operation, simultaneously according to +.>Determining a demand level b2 of the load demand, wherein +.>Representing a load variable; />Representing grid load demand; />Representing a preset load demand; />Representing a demand variable; []Representing a rounding symbol;
and establishing a first relation function Y1 (b 1, b 2) according to the full load level and the demand level.
Preferably, the relationship analysis module includes:
a first judging unit, configured to judge whether b1 in the first relation function is in a first range (s 001, s 002) corresponding to the first constraint and whether b2 in the first relation function is in a second range (s 003, s 004) corresponding to the first constraint, where s002> s001, s004> s003, and s001, s002, s003, s004 are boundary constants;
if both are, then the first constraint is considered to be satisfied;
a second determining unit, configured to determine whether b1 in the first relationship function is in a first range (s 005, s 006) corresponding to the second constraint and whether b2 in the first relationship function is in a second range (s 007, s 008) corresponding to the second constraint, where s006> s005, s008> s007, and s006, s007, s008, s009 are boundary constants;
if they are, then the second constraint is deemed satisfied.
Preferably, the value determining unit is used for whenWhen the urban power plant needs to consume new energy, the heat supply unit is judged not to meet the load operation, and when the urban power plant needs to consume new energy, the heat supply unit is determined to consume new energyFirst electrical quantity d1 +.>The absolute value d2 of the difference of (2);
the grade mapping unit is used for obtaining a mapping load grade from a mapping database according to the first electric quantity d1, the difference absolute value d2 and the current load running value f1 of the heat supply unit, and obtaining a first boundary range of the mapping load grade;
the factor acquisition unit is used for acquiring the working loss factor of the heat supply unit in the working process;
wherein G1 represents a working loss factor set of the heat supply unit; />Representing a maximum workload of the heating unit within an ith workload range; />Representing the actual workload of the heating unit at the j1 th moment in the i-th workload range; />Representing an actual average workload of the heating unit within an ith workload range; />Representing a reference average workload of the heating unit within an ith workload range; />Representing the work loss factor of the heating unit in the ith work load range; m1 represents a total point in time within the corresponding ith workload range; m2 represents the number of workload ranges existing in the heat supply unit;
the factor matching unit is used for matching the first boundary range with a work load range corresponding to the work loss factor set, and obtaining a to-be-used loss factor matched with the first boundary range;
the factor determining unit is used for obtaining the final loss factor of each range point according to the preset loss factor of each range point in the first boundary range and combining the preset loss factor with the corresponding loss factor to be used;
and the low-load control unit is used for extracting the minimum loss factor from all the final loss factors, locking the final point corresponding to the minimum loss factor, generating a control instruction based on the load value corresponding to the final point, transmitting the control instruction to the heat supply unit, and performing low-load operation by the heat supply unit according to the control instruction.
Preferably, the low load control unit is configured to:
wherein min represents a minimum value symbol; />Representing a loss factor to be used; />Represents the +.o in the first boundary range>The preset loss factors of the low load corresponding to the position points; />Represents the +.o in the first boundary range>The low load weight corresponding to each position point; />Representing the final loss factor.
Preferably, the operation control module further includes:
the heat supply determining unit is used for determining the heat supply condition of the electric boiler according to the current running power of the new energy unit, the low-load running power of the heat supply unit, the consumed electricity, the electricity demand and the heat demand;
a parameter monitoring unit for monitoring a current operation parameter of the electric boiler, wherein the current operation parameter is related to the water level and the water temperature of the water level control device and the air combustion ratio of the combustion control device;
the function building unit is used for building a first function R1 of the condition to be heated and simultaneously building a second function R2 of the current operation parameters;
the function comparison unit is used for comparing the first function R1 with the second function R2 to obtain a comparison value of each comparison element;
the condition acquisition unit is used for acquiring a first control condition based on a water level analysis model according to a first comparison sequence of the water level control device; acquiring a second control condition based on the combustion analysis model according to a second comparison sequence of the air combustion control device;
a command generating unit for generating a water level control command of the electric boiler and an air input control command of an air inlet based on the first control condition and the second control condition;
and the instruction control unit is used for controlling the water level electromagnetic valve to perform corresponding first work based on the water level control instruction and controlling the fan to perform second work based on the air input control instruction.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a system diagram of a heating scheme in an embodiment of the invention;
FIG. 2 is a block diagram of an electric boiler system of a heating unit of an urban power plant in an embodiment of the invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
The invention provides an electric boiler system of a heating unit of an urban power plant, as shown in fig. 2, comprising: heating unit and set up the electric boiler of heating unit one side still includes:
the demand monitoring module is used for monitoring the power grid load demand of the urban power plant, judging whether the heat supply unit runs at full load or not when the power grid load demand is larger than a preset load demand, and if so, determining a first relation function between a full load running result and the power grid load demand;
the relation analysis module is used for controlling the electric boiler to stop running when the first relation function meets a first constraint;
when the first relation function meets a second constraint, controlling the electric boiler to operate according to a preset control instruction;
the operation control module is used for judging whether the urban power plant needs to consume new energy electric quantity or not when the heat supply unit does not meet the load operation;
if the energy is needed to be absorbed, the heating unit is controlled to perform low-load operation, and meanwhile, the electric boiler is controlled to perform high-load operation.
In this embodiment, the preset load demand is preset, and the full load operation is preset.
In this embodiment, the electric boiler includes a water level control device and an air combustion control device.
In this embodiment, the first constraint and the second constraint are related to the corresponding full load level and demand level, primarily to determine whether the corresponding levels are within a matching range.
In this embodiment, the relationship function is determined based on the full load operation result and the grid load demand.
In this embodiment, the new energy electricity refers to electric energy generated by green energy sources such as water, wind, and the like.
In this embodiment, the low load operation refers to that the heating unit is operated in a low load manner, for example, when the heating unit is operated at full load, the corresponding load is k1, and when the heating unit is operated at low load, the corresponding load is less than 0.2k 1.
In this embodiment, the high-load operation means that the electric boiler is operated in a high-load manner, for example, the load corresponding to the full-load operation of the electric boiler is k2, and the load corresponding to the high-load operation is greater than 0.6k 2.
In the embodiment, when the power grid load demand is large, the high back pressure unit runs at full load, the electric boiler is stopped, the power generation load is high, the heat supply capacity is high, the large power demand of power generation and heat supply can be met, and meanwhile, large power generation and heat supply benefits are obtained under the condition of high electricity price.
The electric boiler or the heat accumulating electric boiler is used for directly heating the circulating water of the heat supply network, so that the electric energy consumption is increased, the power on-line electric quantity of a power plant is reduced, and the power peak regulation capacity of a unit and the new energy consumption capacity of a power grid are improved by phase change.
From the implementation principle, the electric boiler has complete thermoelectric decoupling capacity, and the thermoelectric decoupling capacity is strong, so that the conversion efficiency from electric energy to heat energy can reach more than 99%.
When the power grid load demand is smaller and a large amount of green new energy electric quantity such as wind power, photovoltaic and the like is required to be consumed, the high back pressure unit operates under the lowest load, meanwhile, the electric boiler is started to operate under the full load, the power generation load is very low, but the power generation peak regulation demand and the heat supply load demand can be met under the condition of low electricity price and even negative electricity price by means of high energy conversion efficiency and extremely strong thermal decoupling capacity of the electric boiler, and meanwhile, under the condition of low electricity price, the power grid is helped to consume green new energy, the loss of the power price of surfing the internet is reduced, and the urban centralized heat supply capacity is ensured.
The beneficial effects of the technical scheme are as follows: the electric boilers and the heating units under different conditions are respectively controlled through judging the load demands, so that the demands of power generation and heat supply are effectively met.
The invention provides an electric boiler system of a heating unit of an urban power plant, which comprises a demand monitoring module, a control module and a control module, wherein the demand monitoring module comprises:
the output load determining unit is used for capturing the outward output loads of the urban power plant at different moments, constructing an output load curve, and obtaining a third curve in a intercepting range, a fourth curve outside an upper intercepting side line and a fifth curve outside a lower intercepting side line by performing second transverse interception on the output load curve;
an average load determining unit configured to obtain a first average load of the third curve, a second average load of the fourth curve, and a third average load of the fifth curve;
acquiring a first difference value c1 between the second average load and the first average load and a second difference value c2 between the first average load and the third average load;
a demand determination unit for taking the first average load as a grid load demand of the urban power plant when s01< c1-c2< s02 and s03< t (y 4) -t (y 5) < s04, wherein s01, s02 represent setting constants for the loads; s03, s04 denote setting constants for time; t (y 4) represents the total time of the fourth curve y 4; t (y 5) represents the total time of the fifth curve y 5;
the power generation load determining unit is used for counting power generation curves of different power generation equipment in the urban power plant when s01< c1-c2< s02 and s03< t (y 4) -t (y 5) < s04 are not met, and according to the equipment type and the equipment standard loss of each power generation equipment, adjusting the corresponding power generation curve y0 according to y1=a1×y0 to obtain a first curve y1, wherein a1 represents an adjustment coefficient obtained based on the equipment type and the equipment standard loss of the corresponding power generation equipment;
the curve intercepting unit is used for intercepting the first curve transversely according to the generating capacity intercepting function to obtain a second curve and further obtaining an exceeding curve exceeding the uppermost transverse line;
the power generation load determining unit is used for determining a first power generation load of the urban power plant according to a second curve of each power generation device, correcting the first power generation load x1 according to a curve relation a2 between an exceeding curve of the same power generation device and the second curve and x1 according to x2=a2 to obtain a second power generation load x2, and taking the second power generation load x2 as a power grid load demand of the urban power plant.
In this embodiment, the outward output load refers to the electric charge supplied outward, that is, the case of electric charge that is currently required by the outside world.
In this embodiment, the output load curve is from time 1 to time 2, where time is taken as the abscissa, the load output corresponding to time is taken as the ordinate, the second lateral intercept is to intercept the load output curve in the preset output load range from time 1 to time 2, and is regarded as the third curve, and is regarded as the fourth curve and the fifth curve outside the preset output load range, and the upper intercept is outside the maximum value of the preset output load range and the lower intercept is outside the minimum value of the preset output load range.
In this embodiment, the average load is calculated by averaging the output load of the corresponding curve.
In this embodiment, the first difference and the second difference are greater than or equal to 0.
In this embodiment, the constant setting for the load and the constant setting for the time are both set in advance.
In this embodiment, the calculation formula of the adjustment coefficient a1 is as follows:
, wherein ,/>Representing the actual loss of the corresponding device type; />Standard loss representing the corresponding device type; />Representing the adjustment parameters, wherein the value is generally 3; />The value range of (5) is [0,0.1 ]]。
In this embodiment, the power generation amount intercepting function refers to intercepting the first curve within a preset power generation amount range within a certain period of time, thereby obtaining the second curve, and the exceeding curve refers to a curve outside the maximum value of the preset power generation amount range.
In this embodiment, the calculation formula of the curve relationship a2 is as follows:
；
wherein ,the representation is based on exceeding the curve->And a second curveIs a relational function of->Time segments representing corresponding curves.
The beneficial effects of the technical scheme are as follows: and determining whether the difference value and the time meet the set conditions or not by determining the outward output load, determining the corresponding power grid load demand based on the outward output load when the difference value and the time meet the set conditions, and calculating the power generation load of the power grid according to the related information of large lighting when the difference value and the time are not met, and taking the power generation load as the power grid load demand, so that the follow-up effective control of a heat supply unit and an electric boiler is ensured.
The invention provides an electric boiler system of a heating unit of an urban power plant, which comprises a demand monitoring module and also comprises the following components:
the unit monitoring unit is used for monitoring the current load running value f1 of the heating unit in real time;
when (when)When the heating unit is operating at full load, wherein +.>Representing a full load operating value;
otherwise, judging that the heating unit is not operated under full load.
Preferably, the demand monitoring module further includes:
a relation function establishing unit for establishing a relation function according toDetermining a full load level b1 of said full load operation, simultaneously according to +.>Determining a demand level b2 of the load demand, wherein +.>Representing a load variable; />Representing grid load demand; />Representing a preset load demand; />Representing a demand variable; []Representing a rounding symbol;
and establishing a first relation function Y1 (b 1, b 2) according to the full load level and the demand level.
The beneficial effects of the technical scheme are as follows: the full load level and the demand level are conveniently and effectively obtained by comparing the current load operation value with the full load operation value, so that a relation function is conveniently and subsequently constructed, and an effective basis is provided for subsequent system control.
The invention provides an electric boiler system of a heating unit of an urban power plant, which comprises a relation analysis module, a control module and a control module, wherein the relation analysis module comprises:
a first judging unit, configured to judge whether b1 in the first relation function is in a first range (s 001, s 002) corresponding to the first constraint and whether b2 in the first relation function is in a second range (s 003, s 004) corresponding to the first constraint, where s002> s001, s004> s003, and s001, s002, s003, s004 are boundary constants;
if both are, then the first constraint is considered to be satisfied;
a second determining unit, configured to determine whether b1 in the first relationship function is in a first range (s 005, s 006) corresponding to the second constraint and whether b2 in the first relationship function is in a second range (s 007, s 008) corresponding to the second constraint, where s006> s005, s008> s007, and s006, s007, s008, s009 are boundary constants;
if they are, then the second constraint is deemed satisfied.
The beneficial effects of the technical scheme are as follows: and comparing two levels in the same function with ranges under different constraints respectively, so as to determine whether constraint conditions are met or not, and providing a basis for subsequent effective control.
The invention provides an electric boiler system of a heating unit of an urban power plant, which comprises an operation control module, a control module and a control module, wherein the operation control module comprises:
a value determining unit for determining whenWhen the heating unit is judged not to meet the load operation, and when the urban power plant needs to consume new energy electric quantity, the first electric quantity d1 and +.>The absolute value d2 of the difference of (2);
the grade mapping unit is used for obtaining a mapping load grade from a mapping database according to the first electric quantity d1, the difference absolute value d2 and the current load running value f1 of the heat supply unit, and obtaining a first boundary range of the mapping load grade;
the factor acquisition unit is used for acquiring the working loss factor of the heat supply unit in the working process;
wherein G1 represents a working loss factor set of the heat supply unit;representing a maximum workload of the heating unit within an ith workload range; />Representing the actual workload of the heating unit at the j1 th moment in the i-th workload range; />Representing an actual average workload of the heating unit within an ith workload range;representing a reference average workload of the heating unit within an ith workload range; />Representing the work loss factor of the heating unit in the ith work load range; m1 represents a total point in time within the corresponding ith workload range; m2 represents the number of workload ranges existing in the heat supply unit;
the factor matching unit is used for matching the first boundary range with a work load range corresponding to the work loss factor set, and obtaining a to-be-used loss factor matched with the first boundary range;
the factor determining unit is used for obtaining the final loss factor of each range point according to the preset loss factor of each range point in the first boundary range and combining the preset loss factor with the corresponding loss factor to be used;
and the low-load control unit is used for extracting the minimum loss factor from all the final loss factors, locking the final point corresponding to the minimum loss factor, generating a control instruction based on the load value corresponding to the final point, transmitting the control instruction to the heat supply unit, and performing low-load operation by the heat supply unit according to the control instruction.
In this embodiment, the mapping database includes different amounts of electricity, differences, load operation values and load levels matched thereto, so that the first boundary range may be obtained, mainly for determining the low load operation range of the heating unit.
In this embodiment, because the heat supply unit has a loss during operation, in the low load operation, an optimal low load operation mode needs to be determined to reduce the loss, so that the working effect of the heat supply unit is as optimal as possible, and therefore, the loss factors in the ranges consistent with the first boundary range, that is, the loss factors to be used, are matched by calculating the loss in the different load ranges.
In this embodiment, the losses corresponding to the heating units under different loads are preset, so that a preset loss factor can be obtained, and by combining with the loss factor to be used, a minimum loss factor can be effectively obtained.
, wherein ,/>Representing a minimum symbol; />Representing a loss factor to be used; />Representing a preset loss factor of a low load corresponding to a j2 position point in the first boundary range;the weight of the low load corresponding to the j2 position point in the first boundary range is represented;
the beneficial effects of the technical scheme are as follows: the boundary range is determined through the mapping database, and then the loss factor of each position point in the boundary range is combined with the loss factor to be used to lock the final point, so that the low-load control of the heat supply unit is realized, and the power generation and heat supply requirements are indirectly ensured.
The invention provides an electric boiler system of a heating unit of an urban power plant, which comprises an operation control module and further comprises:
the heat supply determining unit is used for determining the heat supply condition of the electric boiler according to the current running power of the new energy unit, the low-load running power of the heat supply unit, the consumed electricity, the electricity demand and the heat demand;
a parameter monitoring unit for monitoring a current operation parameter of the electric boiler, wherein the current operation parameter is related to the water level and the water temperature of the water level control device and the air combustion ratio of the combustion control device;
the function building unit is used for building a first function R1 of the condition to be heated and simultaneously building a second function R2 of the current operation parameters;
the function comparison unit is used for comparing the first function R1 with the second function R2 to obtain a comparison value of each comparison element;
the condition acquisition unit is used for acquiring a first control condition based on a water level analysis model according to a first comparison sequence of the water level control device; acquiring a second control condition based on the combustion analysis model according to a second comparison sequence of the air combustion control device;
a command generating unit for generating a water level control command of the electric boiler and an air input control command of an air inlet based on the first control condition and the second control condition;
and the instruction control unit is used for controlling the water level electromagnetic valve to perform corresponding first work based on the water level control instruction and controlling the fan to perform second work based on the air input control instruction.
In this embodiment, the condition to be heated refers to heat that needs to be supplied again in addition to the heat that can be supplied by the heating unit, that is, a certain amount of heat power needs to be supplied by the electric boiler, so as to satisfy the economic benefit of the heating unit.
In this embodiment, the comparison of the first function and the second function is a comparison of the same parameters, such as a comparison of the water level, a comparison of the water level temperature, etc., and thus, the sequences corresponding to the different devices, that is, the comparison values of the parameters included in the corresponding devices, are obtained.
In this embodiment, the water level analysis model and the combustion analysis model are both pre-trained, and the training samples are different training sequences and control conditions matched with the sequences.
In this embodiment, the control instruction is associated with a corresponding control condition.
The beneficial effects of the technical scheme are as follows: the electric boiler is convenient to acquire accurate control conditions and generate accurate control instructions by determining the heat supply condition to be heated of the electric boiler and constructing and comparing functions of the heat supply condition and operation parameters, so that an accurate basis is provided for follow-up control of the electric boiler, and the requirements of power generation and heat supply are guaranteed.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (5)
1. An electric boiler system of a heating unit of an urban power plant, comprising: heating unit and set up the electric boiler of heating unit one side, its characterized in that:
the demand monitoring module is used for monitoring the power grid load demand of the urban power plant, judging whether the heat supply unit runs at full load or not when the power grid load demand is larger than a preset load demand, and if so, determining a first relation function between a full load running result and the power grid load demand;
the relation analysis module is used for controlling the electric boiler to stop running when the first relation function meets a first constraint;
when the first relation function meets a second constraint, controlling the electric boiler to operate according to a preset control instruction;
the operation control module is used for judging whether the urban power plant needs to consume new energy electric quantity or not when the heat supply unit does not meet the load operation;
if the energy is needed to be absorbed, the heating unit is controlled to perform low-load operation, and meanwhile, the electric boiler is controlled to perform high-load operation;
wherein, the demand monitoring module further includes:
the unit monitoring unit is used for monitoring the current load running value f1 of the heating unit in real time;
when (when)When the heating unit is operating at full load, wherein +.>Representing a full load operating value;
otherwise, judging that the heating unit is not operated under full load;
wherein, the demand monitoring module further includes:
a relation function establishing unit for establishing a relation function according toDetermining a full load level b1 of said full load operation, simultaneously according to +.>Determining a demand level b2 of the load demand, wherein +.>Representing a load variable; />Representing grid load demand; />Representing a preset load demand; />Representing a demand variable; []Representing a rounding symbol;
establishing a first relation function Y1 (b 1, b 2) according to the full load level and the demand level;
wherein, the relation analysis module includes:
a first judging unit, configured to judge whether b1 in the first relation function is in a first range (s 001, s 002) corresponding to the first constraint and whether b2 in the first relation function is in a second range (s 003, s 004) corresponding to the first constraint, where s002> s001, s004> s003, and s001, s002, s003, s004 are boundary constants;
if both are, then the first constraint is considered to be satisfied;
a second determining unit, configured to determine whether b1 in the first relationship function is in a first range (s 005, s 006) corresponding to the second constraint and whether b2 in the first relationship function is in a second range (s 007, s 008) corresponding to the second constraint, where s006> s005, s008> s007, and s006, s007, s008, s009 are boundary constants;
if they are, then the second constraint is deemed satisfied.
2. The municipal power plant heating unit electric boiler system according to claim 1, wherein the demand monitoring module comprises:
the output load determining unit is used for capturing the outward output loads of the urban power plant at different moments, constructing an output load curve, and obtaining a third curve in a intercepting range, a fourth curve outside an upper intercepting side line and a fifth curve outside a lower intercepting side line by performing second transverse interception on the output load curve;
an average load determining unit configured to obtain a first average load of the third curve, a second average load of the fourth curve, and a third average load of the fifth curve;
acquiring a first difference value c1 between the second average load and the first average load and a second difference value c2 between the first average load and the third average load;
a demand determination unit for taking the first average load as a grid load demand of the urban power plant when s01< c1-c2< s02 and s03< t (y 4) -t (y 5) < s04, wherein s01, s02 represent setting constants for the loads; s03, s04 denote setting constants for time; t (y 4) represents the total time of the fourth curve y 4; t (y 5) represents the total time of the fifth curve y 5;
the power generation load determining unit is used for counting power generation curves of different power generation equipment in the urban power plant when s01< c1-c2< s02 and s03< t (y 4) -t (y 5) < s04 are not met, and according to the equipment type and the equipment standard loss of each power generation equipment, adjusting the corresponding power generation curve y0 according to y1=a1×y0 to obtain a first curve y1, wherein a1 represents an adjustment coefficient obtained based on the equipment type and the equipment standard loss of the corresponding power generation equipment;
the curve intercepting unit is used for intercepting the first curve transversely according to the generating capacity intercepting function to obtain a second curve and further obtaining an exceeding curve exceeding the uppermost transverse line;
the power generation load determining unit is used for determining a first power generation load of the urban power plant according to a second curve of each power generation device, correcting the first power generation load x1 according to a curve relation a2 between an exceeding curve of the same power generation device and the second curve and x1 according to x2=a2 to obtain a second power generation load x2, and taking the second power generation load x2 as a power grid load demand of the urban power plant.
3. The municipal power plant heating unit electric boiler system according to claim 1, wherein the operation control module comprises:
a value determining unit for determining whenWhen the heating unit is judged not to meet the load operation, and when the urban power plant needs to consume new energy electric quantity, the first electric quantity d1 and +.>The absolute value d2 of the difference of (2);
the grade mapping unit is used for obtaining a mapping load grade from a mapping database according to the first electric quantity d1, the difference absolute value d2 and the current load running value f1 of the heat supply unit, and obtaining a first boundary range of the mapping load grade;
the factor acquisition unit is used for acquiring the working loss factor of the heat supply unit in the working process;
wherein ,representing a working loss factor set of the heating unit; />Representing a maximum workload of the heating unit within an ith workload range; />Representing the actual workload of the heating unit at the j1 th moment in the i-th workload range; />Representing an actual average workload of the heating unit within an ith workload range;representing a reference average workload of the heating unit within an ith workload range; />Representing the work loss factor of the heating unit in the ith work load range; m1 represents a total point in time within the corresponding ith workload range; m2 represents the number of workload ranges existing in the heat supply unit;
the factor matching unit is used for matching the first boundary range with a work load range corresponding to the work loss factor set, and obtaining a to-be-used loss factor matched with the first boundary range;
the factor determining unit is used for obtaining the final loss factor of each range point according to the preset loss factor of each range point in the first boundary range and combining the preset loss factor with the corresponding loss factor to be used;
and the low-load control unit is used for extracting the minimum loss factor from all the final loss factors, locking the final point corresponding to the minimum loss factor, generating a control instruction based on the load value corresponding to the final point, transmitting the control instruction to the heat supply unit, and performing low-load operation by the heat supply unit according to the control instruction.
4. An electric boiler system for a heating unit of an urban power plant according to claim 3, characterized in that said low-load control unit is adapted to:
wherein ,/>Representing a minimum symbol; />Representing a loss factor to be used; />Representing a preset loss factor of a low load corresponding to a j2 position point in the first boundary range;/>the weight of the low load corresponding to the j2 position point in the first boundary range is represented; z1 represents the final loss factor.
5. The municipal power plant heating unit electric boiler system according to claim 1, wherein the operation control module further comprises:
the heat supply determining unit is used for determining the heat supply condition of the electric boiler according to the current running power of the new energy unit, the low-load running power of the heat supply unit, the consumed electricity, the electricity demand and the heat demand;
a parameter monitoring unit for monitoring a current operation parameter of the electric boiler, wherein the current operation parameter is related to the water level and the water temperature of the water level control device and the air combustion ratio of the combustion control device;
the function building unit is used for building a first function R1 of the condition to be heated and simultaneously building a second function R2 of the current operation parameters;
the function comparison unit is used for comparing the first function R1 with the second function R2 to obtain a comparison value of each comparison element;
the condition acquisition unit is used for acquiring a first control condition based on a water level analysis model according to a first comparison sequence of the water level control device; acquiring a second control condition based on the combustion analysis model according to a second comparison sequence of the air combustion control device;
a command generating unit for generating a water level control command of the electric boiler and an air input control command of an air inlet based on the first control condition and the second control condition;
and the instruction control unit is used for controlling the water level electromagnetic valve to perform corresponding first work based on the water level control instruction and controlling the fan to perform second work based on the air input control instruction.
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