CN112902273A - Regulation and control method of heat accumulating type photovoltaic power generation heating system - Google Patents

Regulation and control method of heat accumulating type photovoltaic power generation heating system Download PDF

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CN112902273A
CN112902273A CN202011297145.4A CN202011297145A CN112902273A CN 112902273 A CN112902273 A CN 112902273A CN 202011297145 A CN202011297145 A CN 202011297145A CN 112902273 A CN112902273 A CN 112902273A
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heat
electricity
heating
photovoltaic
period
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翟旭京
田寿涛
许叶林
李庆波
吕盼
辛超山
李伟
李海峰
薛静杰
陈露锋
王鹏朝
童辉
丰志财
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Beijing Huadian Tianda Technology Co ltd
State Grid Xinjiang Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Xinjiang Electric Power Co Ltd
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Beijing Huadian Tianda Technology Co ltd
State Grid Xinjiang Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Xinjiang Electric Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D13/00—Electric heating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1096—Arrangement or mounting of control or safety devices for electric heating systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

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Abstract

The invention discloses a regulation and control method of a heat accumulating type photovoltaic power generation heating system, which comprises the steps of constructing a heat accumulating type photovoltaic power generation heating commercial mode and a heat accumulating type photovoltaic power generation heating system; based on a heat accumulating type photovoltaic power generation heating commercial mode, dividing photovoltaic output of a heat accumulating type photovoltaic power generation heating system into output in a peak power time period and output in a valley power time period; setting a regulation strategy of the output at the peak power time period and a regulation strategy of the output at the valley power time period based on the relation between the photovoltaic output and the heating demand; constructing a profit model and solving the profit model based on a regulation strategy of the output at the peak power time period and a regulation strategy of the output at the valley power time period; regulating and controlling the heat accumulating type photovoltaic power generation heating system based on the optimal gain control strategy; the method enables poor farmers to meet heating requirements in heating seasons with little or no heating cost, and even can obtain benefits, improves the enthusiasm of the poor farmers in using the heat accumulating type photovoltaic heating system, and promotes the popularization of energy conservation and emission reduction and the consumption of new energy.

Description

Regulation and control method of heat accumulating type photovoltaic power generation heating system
Technical Field
The invention relates to the technical field of power systems, in particular to a regulating and controlling method of a heat accumulating type photovoltaic power generation heating system.
Background
The heat accumulating type photovoltaic power generation heating system has the characteristics that the photovoltaic self-generation self-use supplies power for electric heating, the electric heating tracks the photovoltaic power generation in real time for heat accumulation and the like, and the problem of low benefit of coal-to-electricity project can be effectively solved by utilizing the characteristics; however, because photovoltaic output and operation of heat accumulating type electric heating have strong uncertainty, an effective regulation and control method needs to be adopted for a heat accumulating type photovoltaic power generation heating system; the prior art has proposed a distributed electric heating load collaborative optimization operation strategy, which can effectively control the peak load and reduce the operation cost.
However, in the prior art, most researches on the regulation and control method of the heat accumulating type photovoltaic power generation heating system only aim at the combined operation of photovoltaic power generation and heat accumulating type electric heating, and whether the regulation and control method meets the investment expectation of the project or not and is suitable for the business mode of the project operation or not is not considered from the aspect of the project construction from the economic benefit.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for regulating a heat accumulating type photovoltaic power generation heating system, which is a detailed regulation method provided in a specific business model, and combines the characteristics of the photovoltaic output time period, the peak-valley electricity price time period and the heat accumulating type electric heating equipment, so that poor farmers can meet the heating demand in the heating season with little or no heating cost, and even can obtain benefits, thereby forming a good situation of low investment and high benefit, improving the enthusiasm of the poor farmers in using the heat accumulating type photovoltaic heating system, and promoting the popularization of energy conservation and emission reduction and the absorption of new energy.
The technical scheme adopted by the invention is as follows: a regulation and control method for a heat accumulating type photovoltaic power generation heating system comprises the following steps:
s100: constructing a heat accumulating type photovoltaic power generation heating commercial mode and a heat accumulating type photovoltaic power generation heating system;
s200: based on the heat accumulating type photovoltaic power generation heating business mode and the peak-valley electricity price policy, dividing the photovoltaic output of the heat accumulating type photovoltaic power generation heating system into the peak-electricity time period output and the valley-electricity time period output;
s300: setting a regulation strategy of the output at the peak power time period and a regulation strategy of the output at the valley power time period based on the relation between the photovoltaic output and the heating demand;
s400: constructing a project undertaker income model and a poor farmer income model and solving the models based on a regulation strategy of the output at the peak power time period and a regulation strategy of the output at the valley power time period;
s500: and regulating and controlling the heat accumulating type photovoltaic power generation heating system based on the optimal gain control strategy.
Preferably, the control strategy of the output at the peak power time in step S300 specifically includes:
if the photovoltaic output is less than the heating demand, heating is carried out by the photovoltaic output and the energy stored by the heat accumulator, and if the sum of the photovoltaic output and the energy stored by the heat accumulator is not enough to meet the heating demand, electricity is purchased at the peak electricity time period;
if the photovoltaic output is greater than the heating demand, storing the redundant electric energy to the heat accumulator in a heat accumulation manner after the photovoltaic output meets the heating demand, and surfing the Internet with the photovoltaic surplus electricity after the heat accumulation amount of the heat accumulator reaches the upper limit;
and if the photovoltaic output is equal to the heating demand, the energy stored by the heat accumulator is not used, and electricity is not purchased.
Preferably, the photovoltaic contribution is expressed by the following formula:
Figure RE-GDA0002964018330000021
in the formula, PPV(t) is a photovoltaic output value;
Figure RE-GDA0002964018330000025
photovoltaic installation capacity; gSTCIs the solar radiation intensity under standard rated conditions, and has a value of 1000W/m2；TSTCThe temperature of the photovoltaic cell panel is 25 ℃ under the standard rated condition; k is a power temperature coefficient, and is-0.45; gS(t) the solar radiation intensity of the photovoltaic working point in the period of t; t iscAnd (t) is the photovoltaic working point temperature in the period of t.
Preferably, the heating demand is obtained by the following formula:
Figure RE-GDA0002964018330000022
in the formula, Qh(t) the heating load (heating demand) required for the period t; qn′The thermal load required for heating; t is a heat supply time period; f is the building area of the building; q. q.sfIs a heating area heat index of a building, W/m2。
Preferably, the electric quantity of the photovoltaic surplus power grid is obtained by the following formula:
Figure RE-GDA0002964018330000023
in the formula, Qs(t) is the electric quantity of the surplus electricity on the grid in the photovoltaic time period t; delta QWIs the amount of electricity required to fully store the thermal storage device; qPV(t) is the power generation capacity of the photovoltaic t period; qh(t) is the amount of heat required for the period t.
Preferably, the electricity purchase amount during the peak period is obtained by the following formula:
Figure RE-GDA0002964018330000024
in the formula, QB(t) the amount of electricity purchased during the peak period; qPV(t) is the power generation capacity of the photovoltaic t period; qh(t) the heat supply required for the time period t; qWIs the heat storage amount of the heat storage body.
Preferably, the control strategy of the output in the valley power period is specifically as follows:
heating is carried out based on the heat stored by the heat accumulator, and if the heat stored by the heat accumulator cannot meet the heat demand at night, electricity is purchased at the valley electricity time period to supply heat in real time;
and according to the predicted photovoltaic power generation amount and the predicted heat demand in the next day peak power period, storing heat in a valley power period.
Preferably, the purchase electricity amount required by the real-time heating in the valley electricity period is obtained by the following formula:
Figure RE-GDA0002964018330000031
in the formula, Qb1The electricity purchasing quantity required by heat supply in the valley electricity period; qh(t) the heat supply required for the time period t; qW(t1) The heat storage capacity of the heat accumulator at the beginning of valley electricity; t is t1The beginning time of the valley electricity in the evening of the day;
after the heat accumulator supplies heat at night, the residual heat accumulation amount of the heat accumulator is expressed by the following formula:
Figure RE-GDA0002964018330000032
in the formula, QW(t2) The heat storage capacity of the heat accumulator at the beginning of peak electricity; qW(t1) The heat storage capacity of the heat accumulator at the beginning of valley electricity; qh(t) is the amount of heat required for the period t.
Preferably, if the photovoltaic power generation amount does not meet the heat demand in the peak electricity time period of the next day, storing heat in the valley electricity time period, wherein the required stored heat is obtained by the following formula:
Figure RE-GDA0002964018330000033
in the formula, Qb2The heat stored before the end of the valley period, QpPredicting the photovoltaic power generation capacity for the next day; qh(t) is the amount of heat required for the period t.
Preferably, the project undertaker profit model is specifically:
Figure RE-GDA0002964018330000034
in the formula, CinEarnings for project undertakers; c1The price of the valley electricity is; c2Peak electricity prices; c3Patching for photovoltaic power generation; qB(t) the purchase amount of electricity; a is the total hours of heating; qb1For supplying heat during off-peak periodsElectric quantity, Qb2The heat stored before the valley electricity time period is over;
the poor peasant household income model specifically comprises the following steps:
Figure RE-GDA0002964018330000041
in the formula, COPThe income of poor farmers; c4Selling the electricity price for the surplus electricity on the internet; cbeforeThe cost of the farmers spent in the heating season before the project is implemented; qs(t) is the electric quantity of the surplus electricity on the grid in the photovoltaic time period t; a is the total hours of heating; cinThe income of the project undertaker, namely the cost of the farmers for spending in the heating season.
The beneficial effects of the technical scheme are as follows:
(1) the regulation and control method disclosed by the invention can enable poor farmers to form a good situation of low investment and high profit in the heating season, improve the enthusiasm of the poor farmers in using the heat accumulating type photovoltaic heating system, and promote the popularization of energy conservation and emission reduction and the consumption of new energy.
(2) For the heat accumulating type photovoltaic power generation heating project bearer, the regulation and control method provided by the invention can be used for providing certain expectation for the income situation and providing reference indexes for the project in the investment aspect to a certain extent.
(3) The regulation and control method disclosed by the invention is more suitable for engineering operation conditions, and the user enthusiasm is improved.
Drawings
Fig. 1 is a flow chart of a regulating method of a heat accumulating type photovoltaic power generation heating system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a heat accumulating type photovoltaic power generation heating business model according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first day heating operation strategy provided in an exemplary embodiment of the present invention;
fig. 4 is a schematic diagram of the operation strategy after the first day of heating provided in the calculation example of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, which is defined by the claims, i.e., the invention is not limited to the preferred embodiments described.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example one
As shown in fig. 1, the invention provides a regulation and control method of a heat accumulating type photovoltaic power generation heating system, which comprises the following steps:
s100: constructing a heat accumulating type photovoltaic power generation heating commercial mode and a heat accumulating type photovoltaic power generation heating system;
as shown in fig. 2, in the heat accumulating type photovoltaic power generation heating business model, a photovoltaic fund is established by a power grid company in combination with other social capital, and the power grid company and the government participate in a photovoltaic project through a photovoltaic fund composition project company; wherein, the government mainly undertakes the supervision and administration responsibility and gives certain policy subsidies to the project; the main fund of the project is derived from the photovoltaic fund, and the project company is responsible for project construction and operation.
The heat accumulating type photovoltaic power generation heating system comprises a photovoltaic power generation system and a heat accumulating type electric heating system, the heat accumulating type electric heating power utilization mode of the system is that the photovoltaic power generation amount is preferentially utilized to supply heat and accumulate heat, if the photovoltaic power generation amount cannot meet the heat requirement of the whole day, the photovoltaic power generation amount is supplemented by the valley power time period, the peak power is avoided to be used as far as possible, and the operation regulation strategy is combined with the photovoltaic output characteristic and classified according to the peak-valley power price time period.
S200: based on a heat accumulating type photovoltaic power generation heating commercial mode, on the basis of the existing peak-valley electricity price policy, the photovoltaic output of a heat accumulating type photovoltaic power generation heating system is divided into output in a peak electricity time period and output in a valley electricity time period;
on the basis of a heat accumulating type photovoltaic power generation heating business mode and the existing peak-valley electricity price policy, the photovoltaic output of a heat accumulating type photovoltaic power generation heating system is divided into the peak-electricity time period output and the valley-electricity time period output, and the peak-electricity time period output and the valley-electricity time period output follow different regulation and control strategies. The current peak-to-valley electricity rate policy is shown in table 1.
TABLE 1 peak-valley electricity price of electric heating
Type of electric heating Peak electricity time (Yuan/kilowatt hour) Valley period (Yuan/kilowatt hour)
Distributed electric heating 0.224 0.112
Centralized electric heating 0.18 0.09
Remarking: the valley power period is 23: 00-9: 00, 14: 00-16: 00.
s300: setting a regulation strategy of the output at the peak power time period and a regulation strategy of the output at the valley power time period based on the relation between the photovoltaic output and the heating demand;
(1) regulation and control strategy for output in peak power period
Because the main influencing factor of the strategy is the photovoltaic output condition when the peak power time is mainly illuminated in the daytime, the regulation strategy in the peak power time is as follows: if the photovoltaic output is smaller than the heating demand, heating is carried out by the photovoltaic output and the energy stored by the heat accumulator, and if the sum of the photovoltaic output and the energy stored by the heat accumulator is not enough to meet the heating demand, electricity needs to be bought during the peak period; if the photovoltaic output is greater than the heating demand, storing the redundant electric energy to the heat accumulator in a heat accumulation manner after the photovoltaic output meets the heating demand, and surfing the net for the residual electric quantity after the heat accumulation amount of the heat accumulator reaches the upper limit; if the photovoltaic output is equal to the heating demand, the photovoltaic output can just meet the heating demand, and no redundant energy is stored and the energy stored by the heat accumulator or electricity purchasing is not needed.
The photovoltaic output condition is related to the solar radiation illuminance, the ambient temperature and the output power of the photovoltaic under the standard rated condition, and the photovoltaic output is expressed by the following formula:
Figure RE-GDA0002964018330000061
in the formula, PPV(t) is a photovoltaic output value;
Figure RE-GDA0002964018330000062
photovoltaic installation capacity; gSTCIs the solar radiation intensity under standard rated conditions, and has a value of 1000W/m2；TSTCThe temperature of the photovoltaic cell panel is 25 ℃ under the standard rated condition; k is a power temperature coefficient, and is-0.45; gS(t) the solar radiation intensity of the photovoltaic working point in the period of t; t isc(t) is the photovoltaic working point temperature in the period t, and is obtained by the following formula:
Figure RE-GDA0002964018330000063
in the formula, Tc(t) is the photovoltaic operating point temperature at time t; t isout(t) ambient temperature for a period of t; gS(t) the solar radiation intensity of the photovoltaic working point in the period of t; gSTCThe intensity of solar radiation under standard rated conditions.
The heating demand is given by the following formula:
Figure RE-GDA0002964018330000064
in the formula, Qh(t) the heating load (heating demand) required for the period t; qn′The thermal load required for heating; t is a heat supply time period; f is the building area of the building; q. q.sfIs a heating area heat index of a building, W/m2。
The output of the electric heating system meets the following formula:
QEH(t)＝Qh(t) (4)
in the formula, QEH(t) is the output value of electric heating in the time period of t; qh(t) is the amount of heat required for the period t.
The electric quantity of the photovoltaic surplus power on the grid is obtained through the following formula:
Figure RE-GDA0002964018330000065
in the formula, Qs(t) is the electric quantity of the surplus electricity on the grid in the photovoltaic time period t; delta QWIs the amount of electricity required to fully store the thermal storage device; qPV(t) is the power generation capacity of the photovoltaic t period; qh(t) is the amount of heat required for the period t.
The electricity purchasing quantity is obtained by the following formula:
Figure RE-GDA0002964018330000066
in the formula, QB(t) the purchase amount of electricity; qPV(t) Power Generation for photovoltaic time period tAn amount; qh(t) the heat supply required for the time period t; qWIs the heat storage amount of the heat storage body.
(2) Control strategy for output in valley power period
Because the valley electricity period is mainly when there is no illumination at night, and the price of electricity is lower during the valley electricity period, therefore the regulation and control strategy during the valley electricity period is mainly divided into two parts:
the first part is to supply heat by means of the heat stored in the heat accumulator; if the heat accumulator can not meet the heat demand at night by utilizing the heat stored by the photovoltaic in the daytime, the heat accumulator needs to supplement heat in the off-peak electricity period at night to supply heat in real time;
after the peak electricity time period of the heat accumulator is over, if the electricity purchasing situation occurs, the heat accumulation amount at the beginning of the valley electricity is 0; if the condition of surplus electricity on the network occurs, the heat storage capacity is rated; if the above two cases do not occur, the heat storage amount at the beginning of the bottom electricity at night is calculated by subtracting the heat storage amount used during the peak electricity period from the heat storage amount at the beginning of the peak electricity, which is specifically obtained by the following equation:
Figure RE-GDA0002964018330000071
in the formula, QW(t1) The heat storage capacity of the heat accumulator at the beginning of valley electricity; qW(t2) The heat storage capacity of the heat accumulator at the beginning of peak electricity; qW(t) the stored heat amount in the period t; t is t1The beginning time of the valley electricity in the evening of the day; t is t2The time of ending off-peak electricity and starting peak electricity in the next morning; t is t1' is the time of the next day when the valley electricity starts.
If the heat accumulator can not meet the heat demand at night by utilizing the heat stored by the photovoltaic in the daytime, the heat accumulator needs to supplement heat (purchase electricity) at the off-peak electricity period at night to supply heat in real time; the electricity purchasing quantity required by real-time heat supply in the valley electricity period is obtained by the following formula:
Figure RE-GDA0002964018330000072
in the formula, Qb1For supplying during the valley periodElectricity purchase for heat demand; qh(t) the heat supply required for the time period t; qW(t1) The heat storage capacity of the heat accumulator at the beginning of valley electricity; t is t1The beginning time of the valley electricity in the evening of the day.
After the heat accumulator supplies heat at night, the residual heat accumulation amount of the heat accumulator is expressed by the following formula:
Figure RE-GDA0002964018330000073
in the formula, QW(t2) The heat storage capacity of the heat accumulator at the beginning of peak electricity; qW(t1) The heat storage capacity of the heat accumulator at the beginning of valley electricity; qh(t) is the amount of heat required for the period t.
The second part is to store heat in the valley power period according to the predicted photovoltaic power generation amount and heat demand in the next day peak power period;
the electric heating control system predicts the photovoltaic power generation amount and the heat demand amount in the next day peak power period, if the photovoltaic power generation amount does not meet the heat demand amount, in order to prevent the high electricity price in the peak power period, a certain amount of heat (electric quantity) should be stored before the end of the valley power period, and the required stored electric quantity is obtained through the following formula:
Figure RE-GDA0002964018330000081
in the formula, Qb2The heat stored before the end of the valley period, QpPredicting the photovoltaic power generation capacity for the next day; qh(t) is the amount of heat required for the period t.
S300: constructing a project undertaker income model and a poor farmer income model and solving the models based on a regulation strategy of the output at the peak power time period and a regulation strategy of the output at the valley power time period;
constructing a project undertaker income model and a poor farmer income model, and calculating the income available to the project undertaker and the income available to the poor farmer through the project according to the models;
for a project company, the project undertaker revenue model is:
Figure RE-GDA0002964018330000082
in the formula, CinEarnings for project undertakers; c1The price of the valley electricity is; c2Peak electricity prices; c3Patching for photovoltaic power generation; qB(t) the purchase amount of electricity; a is the total hours of heating; qb1The amount of electricity, Q, required for supplying heat during the off-peak periodb2The amount of heat stored before the end of the off-peak period.
For poor farmers, the income model of the poor farmers is as follows:
Figure RE-GDA0002964018330000083
in the formula, COPThe income of poor farmers; c4Selling the electricity price for the surplus electricity on the internet; cbeforeThe cost of the farmers spent in the heating season before the project is implemented; qs(t) is the electric quantity of the surplus electricity on the grid in the photovoltaic time period t; a is the total hours of heating; cinThe income of the project undertaker is also the expense for the farmers to pay in the heating season.
S400: and regulating and controlling the heat accumulating type photovoltaic power generation heating system based on the optimal gain control strategy.
The practical effects of the present invention are analyzed by combining specific examples as follows:
(1) basic parameters of arithmetic example
The method includes the steps that a newly-built heat accumulating type photovoltaic power generation heating project in a certain rural area of Xinjiang is selected, solar energy resources in the area are rich, the heat accumulating type photovoltaic power generation heating project is suitable for being developed, the known project in the embodiment relates to 6858 households, and the heating index is 100W/m heating index per household unit area2The heating area is 60m2The heat load was calculated based on the heating standard, and the required heat supply per household per day was 144kW/h and the number of heating days was 151 days in the case of 24-hour heating. According to the policy of electric heating price of the region, the regionThe peak-to-valley electricity rates of the electric heating are shown in table 1.
(2) Operating according to the operating strategy of the invention
The operation of the project is divided into a first day and a second day, the first day and the second day are calculated, each day is calculated from the peak power moment of the day, 24 hours from the end of the valley power moment of the second day is a heating day, the operation strategy of the first day of heating is shown as the following 3, the heat storage amount of the peak power starting moment of the first day is zero, whether the photovoltaic output meets the heating requirement or not is judged for each time interval, if yes, the sizes of the heat storage amount of the electric heating heat storage body and the capacity of the heat storage body are judged, if not, the redundant photovoltaic output is stored in a heat storage mode, the heat storage amount of the heat storage body is judged again, and the rest electric quantity after the heat storage amount of the heat storage body reaches the upper limit is used for surfing. If the photovoltaic does not meet the heating requirement, the heat storage amount of the heat accumulator and the photovoltaic output are judged whether to meet the heating requirement, if the heat storage amount of the photovoltaic output and the heat accumulator can be used for heating together, if the heat storage amount of the heat accumulator cannot be met, electricity is needed to be purchased, whether the time is a peak electricity time period is judged, if the time is, electricity is purchased according to the peak electricity price, otherwise, electricity is purchased according to the valley end price.
The operation strategy is shown in fig. 4 after the first heating day, and after the first heating day, because the standby heat process is performed, for each time period, only the output of the photovoltaic is needed to be judged to meet the heating requirement, if the output of the photovoltaic meets the heating requirement, the heat storage capacity of the electric heating heat accumulator and the capacity of the heat accumulator are judged, if the heat accumulator is not full, the redundant photovoltaic output is stored in a heat storage mode, then the heat storage capacity of the heat accumulator is judged, and the residual electric quantity after the heat storage capacity of the heat accumulator reaches the upper limit is used for surfing the internet. And if the photovoltaic output does not meet the heating requirement, heating is carried out by using the photovoltaic output and the heat storage amount of the heat accumulator together.
According to the photovoltaic output condition of the area, the thermoelectric conversion efficiency of the heat accumulating type electric heating is considered to be 95%, and various electric quantity conditions can be obtained according to the operation strategy, as shown in table 2.
Table 2 heat accumulating type photovoltaic power generation heating operation first day each item electric quantity condition
Figure RE-GDA0002964018330000091
Figure RE-GDA0002964018330000101
First day night standby heat expenditure: (144-50.5343)' 0.112 ═ 10.4681 (yuan)
The working example shows that the actual photovoltaic output of the farmer family is less, and the problem of surplus power on the internet is solved, so that the power utilization heating in the peak power time can be avoided under the condition of fully utilizing the photovoltaic power generation heating only by carrying out night heat preparation after the first day.
For the project company, the yield of the new heating season of the project company is 1086.55 ten thousand yuan when the photovoltaic power generation subsidy is not counted, namely, when C3 is 0, as can be obtained from the formula (10).
For poor farmers, the heating cost spent by farmers in the heating season is 1584.3535 yuan per household, the farmers need to pay 3000-3300 yuan per household in the heating season before the project is implemented locally, the benefits of the farmers can be obtained by the formula (10), and the farmers can obtain about 1416-1716 yuan in the heating season, namely the regulating and controlling method of the heat accumulating type photovoltaic power generation heating system can help the poor farmers to save the heating cost.
The regulation and control method disclosed by the invention can enable poor farmers to form a good situation of low investment and high profit in the heating season, improve the enthusiasm of the poor farmers in using the heat accumulating type photovoltaic heating system, and promote the popularization of energy conservation and emission reduction and the consumption of new energy. For the heat accumulating type photovoltaic power generation heating project bearer, the regulation and control method provided by the invention can be used for providing certain expectation for the income situation and providing reference indexes for the project in the investment aspect to a certain extent.
The regulation and control method disclosed by the invention is more suitable for engineering operation conditions, and the user enthusiasm is improved.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (10)

1. A regulation and control method for a heat accumulating type photovoltaic power generation heating system is characterized by comprising the following steps:
s100: constructing a heat accumulating type photovoltaic power generation heating commercial mode and a heat accumulating type photovoltaic power generation heating system;
s200: based on the heat accumulating type photovoltaic power generation heating business mode and the peak-valley electricity price policy, dividing the photovoltaic output of the heat accumulating type photovoltaic power generation heating system into the peak-electricity time period output and the valley-electricity time period output;
s300: setting a regulation strategy of the output at the peak power time period and a regulation strategy of the output at the valley power time period based on the relation between the photovoltaic output and the heating demand;
s400: constructing a project undertaker income model and a poor farmer income model and solving the models based on a regulation strategy of the output at the peak power time period and a regulation strategy of the output at the valley power time period;
s500: and regulating and controlling the heat accumulating type photovoltaic power generation heating system based on the optimal gain control strategy.
2. The method according to claim 1, wherein the strategy for controlling the peak-power-period output in step S300 is specifically as follows:
if the photovoltaic output is less than the heating demand, heating is carried out by the photovoltaic output and the energy stored by the heat accumulator, and if the sum of the photovoltaic output and the energy stored by the heat accumulator is not enough to meet the heating demand, electricity is purchased at the peak electricity time period;
if the photovoltaic output is greater than the heating demand, storing the redundant electric energy to the heat accumulator in a heat accumulation manner after the photovoltaic output meets the heating demand, and surfing the Internet with the photovoltaic surplus electricity after the heat accumulation amount of the heat accumulator reaches the upper limit;
and if the photovoltaic output is equal to the heating demand, the energy stored by the heat accumulator is not used, and electricity is not purchased.
3. The method of claim 2, wherein the photovoltaic contribution is expressed by the formula:
Figure RE-FDA0002964018320000011
in the formula, PPV(t) is a photovoltaic output value;
Figure RE-FDA0002964018320000012
photovoltaic installation capacity; gSTCIs the solar radiation intensity under standard rated conditions, and has a value of 1000W/m2；TSTCThe temperature of the photovoltaic cell panel is 25 ℃ under the standard rated condition; k is a power temperature coefficient, and is-0.45; gS(t) the solar radiation intensity of the photovoltaic working point in the period of t; t iscAnd (t) is the photovoltaic working point temperature in the period of t.
4. The method of regulating as claimed in claim 2, wherein the heating demand is given by the following formula:
Qh(t)＝Qn′×t＝∑qf·F×10-3×t (3)
in the formula, Qh(t) the heating load (heating demand) required for the period t; qn′The thermal load required for heating; t is a heat supply time period; f is the building area of the building; q. q.sfIs a heating area heat index of a building, W/m2。
5. A control method according to claim 2, wherein the amount of electricity in the photovoltaic surplus electricity grid is obtained by the following formula:
Figure RE-FDA0002964018320000021
in the formula, Qs(t) is the electric quantity of the surplus electricity on the grid in the photovoltaic time period t; delta QWIs the amount of electricity required to fully store the thermal storage device; qPV(t) is the power generation capacity of the photovoltaic t period; qh(t) is the amount of heat required for the period t.
6. The method of claim 2, wherein the peak period electricity purchase amount is obtained by the following formula:
Figure RE-FDA0002964018320000022
in the formula, QB(t) the amount of electricity purchased during the peak period; qPV(t) is the power generation capacity of the photovoltaic t period; qh(t) the heat supply required for the time period t; qWIs the heat storage amount of the heat storage body.
7. The method according to claim 1, wherein the control strategy for the off-peak period output is specifically:
heating is carried out based on the heat stored by the heat accumulator, and if the heat stored by the heat accumulator cannot meet the heat demand at night, electricity is purchased at the valley electricity time period to supply heat in real time;
and according to the predicted photovoltaic power generation amount and the predicted heat demand in the next day peak power period, storing heat in a valley power period.
8. A control method according to claim 7, wherein the amount of electricity purchased for real-time heating during off-peak periods is obtained by the following formula:
Figure RE-FDA0002964018320000023
in the formula, Qb1The electricity purchasing quantity required by heat supply in the valley electricity period; qh(t) the heat supply required for the time period t; qW(t1) The heat storage capacity of the heat accumulator at the beginning of valley electricity; t is t1The beginning time of the valley electricity in the evening of the day;
after the heat accumulator supplies heat at night, the residual heat accumulation amount of the heat accumulator is expressed by the following formula:
Figure RE-FDA0002964018320000024
in the formula, QW(t2) The heat storage capacity of the heat accumulator at the beginning of peak electricity; qW(t1) The heat storage capacity of the heat accumulator at the beginning of valley electricity; qh(t) is the amount of heat required for the period t.
9. A control method according to claim 7, wherein if the photovoltaic power generation amount is predicted not to meet the heat demand during the sub-daily peak-power period, storing heat during the valley-power period, wherein the required stored heat is obtained by the following formula:
Figure RE-FDA0002964018320000031
in the formula, Qb2The heat stored before the end of the valley period, QpPredicting the photovoltaic power generation capacity for the next day; qh(t) is the amount of heat required for the period t.
10. The method of claim 1, wherein the project undertaker revenue model is specifically:
Figure RE-FDA0002964018320000032
in the formula, CinEarnings for project undertakers; c1The price of the valley electricity is; c2Peak electricity prices; c3Patching for photovoltaic power generation; qB(t) the purchase amount of electricity; a isTotal hours of heating; qb1The amount of electricity, Q, required for supplying heat during the off-peak periodb2The heat stored before the valley electricity time period is over;
the poor peasant household income model specifically comprises the following steps:
Figure RE-FDA0002964018320000033
in the formula, COPThe income of poor farmers; c4Selling the electricity price for the surplus electricity on the internet; cbeforeThe cost of the farmers spent in the heating season before the project is implemented; qs(t) is the electric quantity of the surplus electricity on the grid in the photovoltaic time period t; a is the total hours of heating; cinThe income of the project undertaker, namely the cost of the farmers for spending in the heating season.
CN202011297145.4A 2020-11-18 2020-11-18 Regulation and control method of heat accumulating type photovoltaic power generation heating system Pending CN112902273A (en)

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