CN113128767A - Method for minimizing load operation cost of agricultural irrigation pump by considering standby income - Google Patents
Method for minimizing load operation cost of agricultural irrigation pump by considering standby income Download PDFInfo
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Abstract
The invention relates to the technical field of power system scheduling, in particular to a method for minimizing the load operation cost of an agricultural irrigation water pump considering standby income. The invention provides a method for calculating the maximum reserve capacity of a load of an agricultural irrigation water pump, which utilizes the electricity utilization flexibility of the agricultural irrigation load, obtains benefits by participating in the operation of a power system for reserve while comprehensively considering the expenditure of electricity charges, and thus reduces the energy utilization cost of agricultural irrigation.
Description
Technical Field
The invention relates to the technical field of power system scheduling, in particular to a method for minimizing the load operation cost of an agricultural irrigation pump by considering standby income.
Background
The existing power system mainly utilizes standby resources on a power generation side to realize real-time balance of power, and generally realizes the real-time balance by scheduling traditional generator sets such as coal power, gas power, water power and the like. In a power supply structure mainly based on coal electricity in China, a coal electricity unit has the limitations of slow starting and minimum technical output constraint; if the starting amount of the coal-electricity machine is too much, the serious problems of wind and light abandoning are caused, and the great waste of clean energy is caused; if the coal-electricity power-on amount is insufficient, the adjustment cannot keep up with the rapid fluctuation of renewable energy sources and loads due to the fact that the power-on is not in time or the adjustment speed is insufficient, and the power failure risk is caused. Therefore, conventional standby resources are increasingly unable to adapt to the development of new situation, and it is necessary to fully mine other power fast-adjusting resources, for example, to play the role of demand-side adjustable resources.
Water conservancy has an important role in agricultural development, irrigation and drainage loads are also the largest loads in agricultural production, however, agricultural irrigation loads are subjected to extensive management for a long time, particularly in summer, the agricultural irrigation loads are superposed with air conditioner loads, the load peak value of a power grid is further increased, and the safe and economic operation of the power grid is influenced. Although the agricultural irrigation load is suitable for the growth cycle of crops, the requirement on real-time performance is not outstanding, so the agricultural irrigation load can be used as a typical demand-side adjustable resource and has the capability of providing operation standby for a power system. So, when improving electric wire netting operation security and economic nature through orderly peak-shifting irrigation, the agricultural irrigation load can be through providing the reserve gain of obtaining of operation, further reduces the energy cost of self.
Disclosure of Invention
The invention provides a method for minimizing the operating cost of the agricultural irrigation pump load by considering the standby income, which overcomes the defects of the prior art and reduces the energy cost of the agricultural irrigation pump load by acquiring the standby income.
The technical scheme of the invention is realized by the following measures: a method for minimizing the load operation cost of an agricultural irrigation water pump considering the standby income comprises the steps of determining the quantitative relation constraint of the agricultural irrigation water pump load and the flow of the agricultural irrigation water pump, calculating the constraint of the upper standby capacity and the lower standby capacity of the agricultural irrigation water pump, giving the flow constraint of the agricultural irrigation water pump, giving the interval constraint of daily irrigation net water amount, dividing the time length T of one day into n time periods with the length of delta T based on the constraint, freezing the time variation of the water pump flow in the delta T, and constructing an agricultural irrigation water pump load operation cost minimization model considering the standby income, namely constructing an energy consumption cost function of the agricultural irrigation water pump load considering the standby income and participating in power system scheduling:
wherein E is an energy consumption cost function of the agricultural irrigation pump load taking standby income into consideration and participating in power system dispatching, and P (k) delta t pie(k) Charge of electricity for the kth time period, Rup(k)Δtπr.up(k) Upper spare capacity gain for kth time period, Rdown(k)Δtπr.down(k) The lower spare capacity gain in the kth time period, P (k) is the agricultural irrigation pump load in the kth time period, pie(k) Electricity price for the kth time period, Rup(k)、Rdown(k) Upper spare capacity and lower spare capacity, respectively, of the kth time periodr.up(k)、πr.down(k) Respectively, an upper reserve capacity price and a lower reserve capacity price for the kth time period.
The following is further optimization or/and improvement of the technical scheme of the invention:
the quantitative relation constraint of the agricultural irrigation pump load and the pump flow is as follows:
wherein P (k) is the agricultural irrigation pump load in the kth time period, c is a fixed constant, q (k) is the agricultural irrigation pump flow in the kth time period, h is the total head of the agricultural irrigation pump, and eta is the total efficiency of the water pump, the motor and the transmission device.
The constraints of the upper spare capacity and the lower spare capacity of the agricultural irrigation pump are as follows:
0≤Rup(k)≤Rup.max(k)
0≤Rdown(k)≤Rdown.max(k)
Rup.max(k)＝P(k)
Rdown.max(k)＝Pmax–P(k)
wherein R isup.maxFor maximum upper spare capacity, Rdown.maxTo maximum lower spare capacity, PmaxIs the maximum load of the agricultural irrigation pump, qmaxThe maximum flow of the agricultural irrigation pump.
The flow constraint of the agricultural irrigation pump is as follows: q is more than or equal to 0 and less than or equal to kmax。
The interval constraint of the water purification amount of daily irrigation is as follows:
wherein the content of the first and second substances,
for the water pump daily irrigation water purification, QminMinimum amount of water per day for crops irrigation, QmaxThe maximum net water amount is irrigated for crops every day.
The invention provides a method for calculating the maximum reserve capacity of a load of an agricultural irrigation water pump, which utilizes the electricity utilization flexibility of the agricultural irrigation load, obtains benefits by participating in the operation of a power system for reserve while comprehensively considering the expenditure of electricity charges, and thus reduces the energy utilization cost of agricultural irrigation.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described below with reference to the following examples:
example (b): as shown in FIG. 1, the method for minimizing the operating cost of the agricultural irrigation pump load considering the standby income comprises the following steps:
step 1, determining quantitative relation constraint of agricultural irrigation pump load and pump flow.
The electrical load of a single agricultural irrigation water pump is related to the water flow, the total pump lift and the overall operating efficiency of the water pump, when the electrical load of the water pump in a day is investigated, the time axis is not discretized, the time length T in one day is divided into n time periods with the length of delta T, the time variation of the water pump water flow in the delta T is frozen, and the quantitative relation constraint of the agricultural irrigation water pump load and the water pump flow is as follows:
wherein P (k) is the load (unit kW) of the agricultural irrigation pump in the kth time period, and c is a fixed constant (unit kW s/m)4) And q (k) is the flow rate (m) of the agricultural irrigation pump in the kth time period3And/s), h is the total head (unit m) of the agricultural irrigation pump, and eta is the total efficiency of the pump, the motor and the transmission device.
And 2, calculating the maximum upper spare capacity and the maximum lower spare capacity of the agricultural irrigation pump.
In the dispatching operation process of the power system, the reserve capacity provided by the agricultural irrigation water pump is divided into an upper reserve (reducing power consumption) and a lower reserve (increasing power consumption), and the specific calculation method comprises the following steps:
Rup.max(k)＝P(k) (2)
wherein R isup.maxFor maximum upper spare capacity, Rdown.maxTo maximum lower spare capacity, PmaxFor maximum load of agricultural irrigation pump, qmaxThe maximum flow of the agricultural irrigation pump.
The upper and lower spare capacity that agricultural irrigation pump can provide in each period is restricted by the maximum upper and lower spare capacity:
0≤Rup(k)≤Rup.max(k) (4)
0≤Rdown(k)≤Rdown.max(k) (5)
wherein R isup(k)、Rdown(k) Respectively, the upper spare capacity and the lower spare capacity of the kth period.
And step 3, providing flow restriction of the agricultural irrigation pump.
The agricultural irrigation pump is limited by the technical parameters, the maximum water flow exists in the operation process, and the flow constraint of the agricultural irrigation pump is as follows:
0≤q(k)≤qmax (6)
and 4, providing daily irrigation water purification amount interval constraints.
The clean water volume of the pump daily irrigation should be in a proper interval to meet the requirement of crop growth (the clean water volume required by different crops is not consistent and is not discussed here), so the clean water volume of the pump daily irrigation needs to meet the constraint that:
wherein the content of the first and second substances,
for the water pump daily irrigation water purification, QminMinimum amount of water per day for crops irrigation, QmaxThe maximum net water amount is irrigated for crops every day.
And 5, providing a model for minimizing the load operation cost of the agricultural irrigation pump considering the standby income.
Wherein E is an energy consumption cost function of the agricultural irrigation pump load taking standby income into consideration and participating in power system dispatching
Three parts, P (k) Δ t πe(k) Charge of electricity for the kth time period, Rup(k)Δtπr.up(k) Upper spare capacity gain for kth time period, Rdown(k)Δtπr.down(k) For the next spare capacity gain of the kth time period, pie(k) Electricity price for the kth time period, pir.up(k)、πr.down(k) Respectively, an upper reserve capacity price and a lower reserve capacity price for the kth time period.
The method for minimizing the load operation cost of the agricultural irrigation pump considering the standby income is applied to the scheduling of a single-stage agricultural irrigation pump participating in the power system, and the parameter settings of the simulation example are shown in the table 1.
In combination with the data in table 1, the daily energy cost of the agricultural irrigation pump load is 10.603 yuan when the standby income is not considered, and the total daily energy cost of the agricultural irrigation pump load is reduced to 9.238 yuan when the standby income is considered (i.e. the method for minimizing the operation cost of the agricultural irrigation pump load considering the standby income is adopted in the embodiment).
In conclusion, the method for minimizing the operating cost of the agricultural irrigation pump load considering the standby income of the invention obtains the income by participating in the operation of the power system for standby while comprehensively considering the electric charge expenditure by utilizing the electricity utilization flexibility of the agricultural irrigation load, thereby reducing the energy utilization cost of the agricultural irrigation load.
The technical characteristics form an embodiment of the invention, which has strong adaptability and implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Table 1 parameter settings of simulation examples
| Parameter name | Value of parameter |
| Δt | 10min |
| c | 9.81kW·s/m4 |
| qmax | 0.1m3/s |
| h | 7m |
| η | 0.7 |
| Qmin | 1000m3 |
| Qmax | 1200m3 |
| πe(k),k＝1、2···n | 0.389 yuan/kW.h |
| πr.up(k),k＝1、2···n | 0.05 yuan/kW.h |
| πr.down(k),k＝1、2···n | 0.03 yuan/kW.h |
Claims (8)
1. A method for minimizing the load operation cost of an agricultural irrigation water pump considering the standby income is characterized by determining the quantitative relation constraint of the agricultural irrigation water pump load and the flow of the agricultural irrigation water pump, calculating the constraint of the upper standby capacity and the lower standby capacity of the agricultural irrigation water pump, giving the flow constraint of the agricultural irrigation water pump, giving the interval constraint of the irrigation water purification amount on the given day, dividing the time length T of one day into n time periods with the length of delta T based on the constraint, freezing the time variation of the water pump flow in the delta T, and constructing an agricultural irrigation water pump load operation cost minimization model considering the standby income, namely constructing an energy consumption cost function of the agricultural irrigation water pump load considering the standby income and participating in the power system scheduling:
wherein E is the agricultural irrigation pump load considering the standby income and participates in the power system dispatchingUsing energy cost function, P (k) Δ t πe(k) Charge of electricity for the kth time period, Rup(k)Δtπr.up(k) Upper spare capacity gain for kth time period, Rdown(k)Δtπr.down(k) The lower spare capacity gain in the kth time period, P (k) is the agricultural irrigation pump load in the kth time period, pie(k) Electricity price for the kth time period, Rup(k)、Rdown(k) Upper spare capacity and lower spare capacity, respectively, of the kth time periodr.up(k)、πr.down(k) Respectively, an upper reserve capacity price and a lower reserve capacity price for the kth time period.
2. The method of minimizing operational costs of agricultural irrigation pump load in view of standby revenue as claimed in claim 1, wherein the quantitative relationship constraint of agricultural irrigation pump load and pump flow is:
wherein P (k) is the agricultural irrigation pump load in the kth time period, c is a fixed constant, q (k) is the agricultural irrigation pump flow in the kth time period, h is the total head of the agricultural irrigation pump, and eta is the total efficiency of the water pump, the motor and the transmission device.
3. A method for minimizing the operating cost of a load of an agricultural irrigation pump considering reserve income according to claim 1 or 2, wherein the constraints of the upper reserve capacity and the lower reserve capacity of the agricultural irrigation pump are as follows:
0≤Rup(k)≤Rup.max(k)
0≤Rdown(k)≤Rdown.max(k)
Rup.max(k)＝P(k)
Rdown.max(k)＝Pmax–P(k)
wherein R isup.maxFor maximum upper spare capacity, Rdown.maxTo maximum lower spare capacity, PmaxIs the maximum load of the agricultural irrigation pump, qmaxThe maximum flow of the agricultural irrigation pump.
4. A method for minimizing the load operation cost of an agricultural irrigation pump considering the reserve income according to claim 1 or 2, wherein the flow rate constraint of the agricultural irrigation pump is: q is more than or equal to 0 and less than or equal to kmax。
5. A method for minimizing the operational cost of a pump for agricultural irrigation which takes into account the reserve income as set forth in claim 3, wherein 0. ltoreq. q (k). ltoreq. qmax。
6. A method for minimizing the load operation cost of agricultural irrigation water pumps considering reserve income according to claim 1, 2 or 5, characterized in that the interval constraint of the water amount of the daily irrigation net water is as follows:
wherein the content of the first and second substances,
for the water pump daily irrigation water purification, QminMinimum amount of water per day for crops irrigation, QmaxThe maximum net water amount is irrigated for crops every day.
7. A method for minimizing the operational cost of a pump for agricultural irrigation in consideration of spare income according to claim 3, characterized in that the interval constraint of the water volume for daily irrigation is:
wherein the content of the first and second substances,
for the water pump daily irrigation water purification, QminMinimum amount of water per day for crops irrigation, QmaxThe maximum net water amount is irrigated for crops every day.
8. The method for minimizing the operating cost of the agricultural irrigation pump load considering the standby income according to claim 4, wherein the daily irrigation net water volume interval constraint is as follows:
wherein the content of the first and second substances,
for the water pump daily irrigation water purification, QminMinimum amount of water per day for crops irrigation, QmaxThe maximum net water amount is irrigated for crops every day.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116667342A (en) * | 2023-07-27 | 2023-08-29 | 南京邮电大学 | Agricultural greenhouse temperature control load regulation and control method considering standby capability |
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Cited By (2)
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| CN116667342A (en) * | 2023-07-27 | 2023-08-29 | 南京邮电大学 | Agricultural greenhouse temperature control load regulation and control method considering standby capability |
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