CN113572180A - Energy storage system power regulation and control method based on lightning stroke probability - Google Patents
Energy storage system power regulation and control method based on lightning stroke probability Download PDFInfo
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Abstract
Under the condition of known lightning stroke probability, in order to reduce possible power loss of a system caused by lightning stroke, other power supplies need to be adjusted to transfer power flow, and therefore loss of the system is reduced when a lightning stroke accident occurs. The invention relates to a method for controlling the output power of an energy storage system, in particular to a method for controlling the output power of the energy storage system. The invention has the following advantages: and the energy storage is scheduled to perform power flow transfer under the condition that the lightning stroke probability exists, so that the loss caused by lightning can be obviously reduced.
Description
Technical Field
The invention belongs to the technical field of dynamic lightning protection of power systems, and particularly relates to a power regulation and control method of an energy storage system based on lightning stroke probability.
Background
At present, in the field of lightning protection of electric power systems, passive lightning protection measures for installing equipment such as lightning rods and lightning wires are mainly taken. In order to further improve the capability of the system to deal with lightning, the related technology of dynamic lightning protection is rapidly developed. The technology how to adjust other schedulable energy sources for power support and transfer is less under the condition of lightning stroke probability, mainly the other schedulable energy sources are considered to be output with constant power, the adjustment mode cannot dynamically update other power sources according to the lightning stroke probability, and the economic operation of the system is not facilitated.
In order to further improve the active defense capability of the system against lightning, the invention takes the stored energy as a scheduling object, and dynamically adjusts the output power of the stored energy according to the forecast result of the lightning probability under the condition of lightning so that the energy storage system bears partial load, thereby reducing the loss load caused by lightning stroke, improving the power supply capability and the power supply quality of the system and improving the active defense capability of the system against the lightning stroke.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an energy storage power regulation and control method based on lightning stroke probability.
The invention adopts the following technical scheme:
an energy storage system power regulation and control method based on lightning stroke probability comprises the following steps:
step 1, for the current time interval
Probability of lightning forecast
When collecting
Then, entering step 2; otherwise, collecting the next time interval
Probability of lightning forecast
Repeating the step;
representing the minimum lightning forecast probability of the method for regulating and controlling the power of the energy storage system; said time interval
The period is a thunder and lightning forecast period, is equal to an energy storage regulation period and has the unit of hour;
step 2, based on the collection in step 1
Calculating possible loss caused by lightning before the output power of the dispatchable power supply is regulated and controlled;
step 3, calculating the power loss of a system containing the schedulable power supply due to lightning stroke when the schedulable power supply output power is regulated and controlled;
step 4, obtaining the adjustment quantity of the output power of the dispatchable power supply according to the thunder forecast probability, and carrying out adjustment on the current time interval
And (4) after the energy storage power is adjusted, returning to the step 1, and performing thunder forecast probability acquisition and schedulable power output power regulation and control at the next time interval.
In step 1, when the probability of lightning forecast
When the lightning is not thunder, the lightning is not thunder;
<probability of lightning forecast
When the lightning is not in use, the lightning is basically not thunder;
probability of thunder forecast is less than or equal to
When the lightning exists, the lightning is possible; probability of lightning forecast
In the meantime, the lightning exists.
In step 2, when the schedulable power supply does not participate in the regulation, the possible loss caused by the lightning stroke is as follows:
wherein the content of the first and second substances,
the unit of power loss caused by lightning striking a line is kW;
is the electricity price, the unit is yuan/kWh;
forecasting probability for lightning;
the period is equal to the period of energy storage regulation and control, and the unit is hour.
Step 3 comprises the following steps:
step 3.1, calculating the short-time scheduling cost loss of the schedulable power supply;
step 3.2, calculating the possible loss caused by lightning stroke when the output power of the dispatchable power supply is regulated and controlled;
the short-time scheduling cost loss of the schedulable power supply in step 3.1 satisfies the following relation:
wherein the content of the first and second substances,
the unit is element for the schedulable power supply short-time scheduling cost;
the unit price is yuan/(kW)2h，
The number of charge and discharge cycles of the schedulable power supply is given in units of times;
the unit is kW for the actual power of the schedulable power supply;
the unit is yuan/kWh for the investment cost of the schedulable power supply;
the efficiency of the power supply can be scheduled.
In step 3.2, the possible loss caused by the lightning stroke during the output power regulation of the schedulable power supply meets the following relational expression:
wherein the content of the first and second substances,
the unit is kW for the actual power of the schedulable power supply;
is the electricity price, the unit is yuan/kWh;
the unit of power loss caused by lightning striking a line is kW;
the period is equal to the period of energy storage regulation and control, and the unit is hour.
Step 4 comprises the following steps:
step 4.1, calculating an expected difference value before and after the output power of the dispatchable power supply is regulated;
step 4.2, calculating the schedulable power supply output power which can make the expected difference value in the step 4.1 be the optimal value of the schedulable power supply output power
；
And 4.3, adjusting the output power of the schedulable power supply according to the operation constraint of the energy storage system.
The expected difference before and after the output power of the schedulable power supply in step 4.1 is regulated satisfies the following relation:
in step 4.2, the schedulable power supply outputs the optimum value of power
The following relation is satisfied:
in step 4.3, the operating constraints of the energy storage system satisfy the following relation:
wherein the content of the first and second substances,SOC min、SOC maxrespectively as the minimum and maximum allowable states of charge for the operation of the schedulable power supply;SOC(t) is the actual state of charge of the schedulable power supply;P BminandP Bmaxrespectively the minimum and maximum power allowed for operation of the schedulable power supply,
the actual power of the power supply is schedulable.
The method for adjusting the output power of the dispatching power supply comprises the following steps:
compared with the prior art, the invention has the beneficial effects that:
1. the invention dispatches the stored energy to carry out the power flow transfer under the condition that the lightning stroke probability exists, can improve the initiative of the system for dealing with the lightning stroke event, ensures the power supply of important loads in the system, and obviously reduces the power loss caused by the lightning;
2. the algorithm provided by the invention can reduce the power transmission between different power grids under the lightning condition and reduce the relation between the power grid in the lightning area and other power grids, and under the condition, even if a lightning accident occurs, the influence on other power grids can be reduced.
3. The method provided by the invention can be applied to the regulation and control of the energy storage power of the energy storage battery, and can achieve the same effect when the energy storage battery is changed into other schedulable power supplies.
Drawings
FIG. 1 is a flow chart of an energy storage system power regulation method based on lightning stroke probability according to the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in fig. 1, a flow chart of a method for regulating and controlling power of an energy storage system based on lightning stroke probability according to the present invention includes:
step 1, for the current time interval
Probability of lightning forecast
When collecting
Then, entering step 2; otherwise, collecting the next time interval
Probability of lightning forecast
Repeating the step;
representing the minimum lightning forecast probability of the method for regulating and controlling the power of the energy storage system;
the period is a thunder and lightning forecast period, is equal to an energy storage regulation period and has the unit of hour;
for a specific site, the probability of lightning forecast is specified as follows: probability of lightning forecast
No thunder and lightning;
<probability of lightning forecast
Substantially no lightning;
probability of thunder forecast is less than or equal to
Lightning is possible; probability of lightning forecast
There is lightning. Preferably, the first and second liquid crystal materials are,
is 20 percent of the total weight of the mixture,
the content of the active carbon is 50 percent,
the content was 70%.
In order to ensure the safety of the system and reduce unnecessary loss caused by thunder as much as possible, the probability of thunder forecast is
The method for controlling the output power of the schedulable power supply is triggered in time.
In an embodiment of the invention, the schedulable power source used is a battery.
Step 2, based on the collection in step 1
And calculating the possible loss caused by the lightning before the output power of the dispatchable power supply is regulated and controlled. The possible loss of the system due to lightning strikes is determined without regard to the dispatchable power supply for power transfer.
When the dispatchable power supply does not participate in regulation, the possible loss caused by lightning stroke is as follows:
wherein the content of the first and second substances,
the unit of power loss caused by lightning striking a line is kW;
is the electricity price, the unit is yuan/kWh;
forecasting probability for lightning;
the period is equal to the period of energy storage regulation and control, and the unit is hour.
And 3, calculating the power loss possibly caused by lightning stroke of a system containing the schedulable power supply when the schedulable power supply output power is regulated and controlled.
Step 3.1, calculating the short-time scheduling cost loss of the schedulable power supply;
the operation cost of the schedulable power supply depends on the number of charging and discharging cycles of the stored energy on one hand, and on the other hand, the discharging current also increases the internal resistance of the battery, and the short-time scheduling cost loss of the schedulable power supply can be determined by the following formula under the condition of considering the two aspects.
Wherein the content of the first and second substances,
the unit is element for the schedulable power supply short-time scheduling cost;
the unit price is yuan/(kW)2h，
The number of charge and discharge cycles of the schedulable power supply is given in units of times;
the unit is kW for the actual power of the schedulable power supply;
the unit is yuan/kWh for the investment cost of the schedulable power supply;
the efficiency of the power supply can be scheduled.
Step 3.2, calculating the possible loss caused by lightning stroke when the output power of the dispatchable power supply is regulated and controlled;
when the output power of the schedulable power supply is regulated, the schedulable power supply bears a part of power, and the possible loss caused by the lightning stroke is as follows:
wherein the content of the first and second substances,
the unit is kW for the actual power of the schedulable power supply;
is the electricity price in units of yuan/kWh.
Step 4, obtaining the adjustment quantity of the output power of the dispatchable power supply according to the thunder forecast probability, and carrying out adjustment on the current time interval
And (4) after the energy storage power is adjusted, returning to the step 1, and performing thunder forecast probability acquisition and schedulable power output power regulation and control at the next time interval.
Step 4.1, the expected difference value before and after the output power of the schedulable power supply is regulated is as follows:
step 4.2, obviously, ΔY< 0, i.e. the finding enables a ΔYMinimum, i.e. maximum loss reduction, at which time the output power of the power supply can be scheduled
Can be determined by the quadratic function of step 4.1, and the optimal value of the schedulable power supply output power can be found from the quadratic function of step 4.1
This is represented by the following formula.
At this time, possible loss of the entire system due to lightning can be reduced. And adjusting the output power of the dispatchable power supply when the lightning forecast data is obtained according to the relational expression.
And 4.3, adjusting the output power of the schedulable power supply according to the operation constraint of the energy storage system.
The constraint conditions satisfy the following relations:
wherein the content of the first and second substances,SOC min、SOC maxrespectively as the minimum and maximum allowable states of charge for the operation of the schedulable power supply;SOC(t) is the actual state of charge of the schedulable power supply;P BminandP Bmaxrespectively the minimum and maximum power allowed for operation of the schedulable power supply,
in order to be able to schedule the actual power of the power supply, in this context, the discharge is required, so
>0。
In view of the above constraints, the method for adjusting the output power of the schedulable power supply can be obtained as shown in the following formula.
After the regulation period is finished, the next regulation period is switched to, and the time t is correspondingly increased
。
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (11)
1. An energy storage system power regulation and control method based on lightning stroke probability is characterized by comprising the following steps:
step 1, for the current time interval
Probability of lightning forecast
When collecting
Then, entering step 2; otherwise, collecting the next time interval
Probability of lightning forecast
Repeating the step;
representing the minimum lightning forecast probability of the method for regulating and controlling the power of the energy storage system; said time interval
The period is a thunder and lightning forecast period, is equal to an energy storage regulation period and has the unit of hour;
step 2, based on the collection in step 1
Calculating possible loss caused by lightning before the output power of the dispatchable power supply is regulated and controlled;
step 3, calculating the power loss of a system containing the schedulable power supply due to lightning stroke when the schedulable power supply output power is regulated and controlled;
step 4, obtaining the adjustment quantity of the output power of the dispatchable power supply according to the thunder forecast probability, and carrying out adjustment on the current time interval
And (4) after the energy storage power is adjusted, returning to the step 1, and performing thunder forecast probability acquisition and schedulable power output power regulation and control at the next time interval.
2. The energy storage system power regulation method based on lightning stroke probability according to claim 1, characterized in that:
in the step 1, when the probability of lightning forecast is
When the lightning is not thunder, the lightning is not thunder;
<probability of lightning forecast
When the lightning is not in use, the lightning is basically not thunder;
probability of thunder forecast is less than or equal to
When the lightning exists, the lightning is possible; probability of lightning forecast
In the meantime, the lightning exists.
3. The energy storage system power regulation method based on lightning stroke probability according to claim 1, characterized in that:
in step 2, when the schedulable power supply does not participate in the regulation, the possible loss caused by the lightning stroke is as follows:
wherein the content of the first and second substances,
the unit of power loss caused by lightning striking a line is kW;
is the electricity price, the unit is yuan/kWh;
forecasting probability for lightning;
the period is equal to the period of energy storage regulation and control, and the unit is hour.
4. The energy storage system power regulation method based on lightning stroke probability according to claim 3, characterized in that:
the step 3 comprises the following steps:
step 3.1, calculating the short-time scheduling cost loss of the schedulable power supply;
and 3.2, calculating the possible loss caused by the lightning stroke when the output power of the dispatchable power supply is regulated and controlled.
5. The energy storage system power regulation method based on lightning stroke probability according to claim 4, characterized in that:
the short-time scheduling cost loss of the schedulable power supply in the step 3.1 meets the following relational expression:
wherein the content of the first and second substances,
the unit is element for the schedulable power supply short-time scheduling cost;
the unit price is yuan/(kW)2h，
The number of charge and discharge cycles of the schedulable power supply is given in units of times;
the unit is kW for the actual power of the schedulable power supply;
the unit is yuan/kWh for the investment cost of the schedulable power supply;
the efficiency of the power supply can be scheduled.
6. The energy storage system power regulation method based on lightning stroke probability according to claim 5, characterized in that:
the possible loss caused by the lightning stroke during the regulation and control of the output power of the schedulable power supply in the step 3.2 meets the following relational expression:
wherein the content of the first and second substances,
the unit is kW for the actual power of the schedulable power supply;
is the electricity price, the unit is yuan/kWh;
the unit of power loss caused by lightning striking a line is kW;
the period is equal to the period of energy storage regulation and control, and the unit is hour.
7. The energy storage system power regulation method based on lightning stroke probability according to claim 6, characterized in that:
the step 4 comprises the following steps:
step 4.1, calculating an expected difference value before and after the output power of the dispatchable power supply is regulated;
step 4.2, calculating the schedulable power supply output power which can make the expected difference value in the step 4.1 be the optimal value of the schedulable power supply output power
；
And 4.3, adjusting the output power of the schedulable power supply according to the operation constraint of the energy storage system.
8. The energy storage system power regulation method based on lightning stroke probability according to claim 7, characterized in that:
the expected difference before and after the output power of the schedulable power supply in the step 4.1 is regulated meets the following relation:
9. the energy storage system power regulation method based on lightning stroke probability according to claim 7, characterized in that:
in the step 4.2, the output power optimum value of the schedulable power supply
The following relation is satisfied:
10. the energy storage system power regulation method based on lightning stroke probability according to claim 7, characterized in that:
in the step 4.3, the operation constraint conditions of the energy storage system satisfy the following relation:
wherein the content of the first and second substances,SOC min、SOC maxrespectively as the minimum and maximum allowable states of charge for the operation of the schedulable power supply;SOC(t) is the actual state of charge of the schedulable power supply;P BminandP Bmaxrespectively the minimum and maximum power allowed for operation of the schedulable power supply,
the actual power of the power supply is schedulable.
11. The energy storage system power regulation method based on lightning strike probability of claim 10, wherein:
the method for adjusting the output power of the dispatching power supply comprises the following steps:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115276062A (en) * | 2022-07-22 | 2022-11-01 | 国网江苏省电力有限公司苏州供电分公司 | Wind storage combined system power two-layer regulation and control method and system based on lightning stroke probability |
| CN115409427A (en) * | 2022-10-28 | 2022-11-29 | 国网江西省电力有限公司供电服务管理中心 | Method and device for evaluating multiple states of available adjustment capacity of residential load |
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| GUO JUNTIAN等: "Lightning warning method of transmission lines based on multi-information fusion Analysis of summer thunderstorms in Jiangsu", 《2014 INTERNATIONAL CONFERENCE ON LIGHTNING PROTECTION》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276062A (en) * | 2022-07-22 | 2022-11-01 | 国网江苏省电力有限公司苏州供电分公司 | Wind storage combined system power two-layer regulation and control method and system based on lightning stroke probability |
| CN115276062B (en) * | 2022-07-22 | 2024-04-26 | 国网江苏省电力有限公司苏州供电分公司 | Wind-storage combined system power two-layer regulation and control method and system based on lightning probability |
| CN115409427A (en) * | 2022-10-28 | 2022-11-29 | 国网江西省电力有限公司供电服务管理中心 | Method and device for evaluating multiple states of available adjustment capacity of residential load |
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| CN113572180B (en) | 2022-01-25 |
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