CN114665514A - Photovoltaic absorption and auxiliary peak regulation coordination control method for energy storage - Google Patents

Photovoltaic absorption and auxiliary peak regulation coordination control method for energy storage Download PDF

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Publication number
CN114665514A
CN114665514A CN202111497566.6A CN202111497566A CN114665514A CN 114665514 A CN114665514 A CN 114665514A CN 202111497566 A CN202111497566 A CN 202111497566A CN 114665514 A CN114665514 A CN 114665514A
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energy storage
power
charging
time period
constraint
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赵璐
邓少平
巩晋通
范黎
李园林
陈红坤
高鹏
杨鑫源
张哲原
肖厦颖
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Wuhan University WHU
PowerChina Hubei Electric Engineering Co Ltd
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Wuhan University WHU
PowerChina Hubei Electric Engineering Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management

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Abstract

The invention relates to the technical field of energy storage regulation and control, in particular to a photovoltaic absorption and auxiliary peak regulation coordination control method for energy storage. Acquiring actual output data and theoretical maximum output data of a photovoltaic power station on a typical day, and determining a light abandoning time period and a light abandoning curve; obtaining an energy storage charging time period according to the light abandoning curve, and executing an energy storage consumption control strategy in the light abandoning time period to obtain charging power; acquiring a daily load curve of a node system, and correcting a peak regulation time period and an initial value of energy storage capacity of the load curve according to an energy storage charging time period and charging power; determining the time period and the charging and discharging power of the energy storage participating in the auxiliary peak shaving according to the load curve after the peak shaving time period is corrected; and performing energy storage all-day charging and discharging control according to the light abandoning time period, the auxiliary peak regulation time period, the charging power stored in the light abandoning time period and the charging/discharging power stored in the auxiliary peak regulation time period. The light abandoning rate requirement is met, the number of hours for energy storage utilization can be increased, and the application scenarios of light abandoning and auxiliary peak regulation can be met.

Description

Photovoltaic energy storage consumption and auxiliary peak regulation coordination control method
Technical Field
The invention relates to the technical field of energy storage regulation and control, in particular to a photovoltaic absorption and auxiliary peak regulation coordination control method for energy storage.
Background
The total installed capacity of wind power and solar power generation in China in 2020-2030 years can reach more than 12 hundred million kilowatts, and the new energy output has the problems of randomness, intermittence and the like, so that a severe challenge is provided for the flexibility of a power grid. The energy storage technology has an energy space-time transfer function, so that the power fluctuation of new energy can be effectively inhibited, the new energy consumption rate is greatly improved, and the development mode of new energy and energy storage becomes common knowledge in the industry. Related policies for configuring and constructing energy storage of new energy stations are also continuously introduced in various provinces of China, and energy storage equipment with the configuration time of 5% -20% and the continuous charging and discharging time of not shorter than 2 hours is mostly required to be configured. However, the existing research on the energy storage control strategy focuses on optimization in a single application scene, such as peak clipping and valley filling, frequency modulation, and stabilizing new energy output, and does not relate to a coordination control method among multiple application scenes, the proposed control strategy cannot adapt to multiple application scenes in which energy storage is configured in a new situation and simultaneously participates in light curtailment and peak modulation auxiliary service, and the number of hours for energy storage utilization is low.
Under this background, through the charge-discharge period and the power of reasonable control energy storage, can make the energy storage of new forms of energy station configuration outside satisfying self task of disappearing, further promote the utilization ratio of energy storage through participating in supplementary peak shaver, be favorable to the popularization of new forms of energy + energy storage mode.
Disclosure of Invention
The invention aims to provide a photovoltaic absorption and auxiliary peak regulation coordination control method for energy storage, aiming at the defects of the prior art, by reasonably dividing time periods of different application scenes and adopting corresponding control strategies aiming at the different application scenes, the requirement of the light rejection rate is met, the number of hours for utilizing the energy storage is increased, the application scenes of absorption and auxiliary peak regulation can be met simultaneously, and the popularization of a new energy source and energy storage mode is facilitated.
The invention relates to a coordination control method for energy storage to promote photovoltaic absorption and participate in peak regulation auxiliary service, which adopts the technical scheme that the method comprises the following steps:
acquiring actual output data and theoretical maximum output data of a photovoltaic power station on a typical day, and determining a light abandoning time period and a light abandoning curve;
obtaining an energy storage charging time period according to the light abandoning curve, and executing an energy storage consumption control strategy in the light abandoning time period to obtain charging power;
acquiring a daily load curve of a node system, and correcting a peak regulation time period and an initial value of energy storage capacity of the load curve according to the energy storage charging time period and the charging power;
determining the time period and the charging and discharging power of the energy storage participating in the auxiliary peak shaving according to the load curve after the peak shaving time period is corrected;
and performing energy storage all-day charging and discharging control according to the light abandoning time period, the auxiliary peak regulation time period, the charging power stored in the light abandoning time period, and the charging power and the discharging power stored in the auxiliary peak regulation time period.
Preferably, the method for determining the light abandoning time period includes:
judgment formula
Figure RE-GDA0003633670470000021
Whether the time period is established or not is judged, if so, the time period is a light abandoning time period;
wherein the content of the first and second substances,
Figure RE-GDA0003633670470000022
is a photovoltaic theoretical output value at the time t,
Figure RE-GDA0003633670470000023
is the actual output value of the photovoltaic at the time t,
Figure RE-GDA0003633670470000024
and the photovoltaic light abandoning power at the time t is obtained.
Preferably, the executing the energy storage consumption control strategy in the light abandoning time period to obtain the charging power of the light abandoning time period includes:
setting a lower limit P of the energy storage consumption abandoned optical power in the abandoned optical time periodcThe initial value and the iteration step length delta P;
judging whether a first constraint condition is met at the moment t, wherein the first constraint condition comprises a light rejection rate constraint and an energy storage capacity constraint;
if so, according to the formula
Figure RE-GDA0003633670470000031
Calculating the charging power of the light abandoning time period at the time t
Figure RE-GDA0003633670470000032
And outputting;
if the light rejection rate constraint is not satisfied, let Pc＝Pc- Δ P is iterated until a first constraint is met, the new stored energy is taken away and the optical power lower limit P is abandonedcSubstituting into formula
Figure RE-GDA0003633670470000033
Outputting charging power at time t
Figure RE-GDA0003633670470000034
If the energy storage capacity constraint is not satisfied, let Pc＝PcThe + delta P is iterated until a first constraint condition is met, and the new energy storage is consumed to abandon the lower limit P of the optical powercSubstituting into formula
Figure RE-GDA0003633670470000035
Outputting charging power at time t
Figure RE-GDA0003633670470000036
Wherein the content of the first and second substances,
Figure RE-GDA0003633670470000037
the photovoltaic light rejection power at the time t,
Figure RE-GDA0003633670470000038
the maximum charging power is stored.
Preferably, the lower limit of the optical power P is eliminated by the stored energycThe initial value of (A) is any value between 0 and the maximum abandoned optical power.
Preferably, the first constraint condition includes:
Figure RE-GDA0003633670470000039
wherein eta is the light rejection rate required to be achieved, E is the energy storage capacity, delta t is the charging power switching time interval, i-j are the light rejection time interval, RqgTo reject ratio, EpvThe actual photovoltaic power generation capacity in the period is calculated.
Preferably, the correcting the peak shaving time interval and the initial value of the energy storage capacity of the load curve according to the energy storage charging time period and the charging electric quantity comprises:
using a formula
Figure RE-GDA0003633670470000041
Correcting the peak regulation time interval and the initial value of the energy storage capacity of the load curve;
wherein, TtfFor peak shaving periods, T is the duration of the day, TxnTo take away the light-off period, EiniFor the initial value of the energy storage capacity of the energy storage participating in the auxiliary peak shaving,
Figure RE-GDA0003633670470000042
and delta t is the charging power of the stored energy at the moment t, the switching time interval of the charging power is delta t, and E is the energy storage capacity.
Preferably, determining the time period and the charge-discharge power during which the stored energy participates in the auxiliary peak shaving according to the load curve after the peak shaving period is corrected includes:
calculating according to the load curve after the peak regulation period to obtain the average load power, and determining the lower limit P of the discharge power according to the average load power, the maximum load power and the minimum load power1And upper limit of charging power P2And an iteration step size Δ P;
judging whether a second constraint condition is met at the moment t, wherein the second constraint condition comprises energy storage capacity constraint, energy storage correction electric quantity constraint and energy storage charge and discharge quantity balance constraint;
if EchIf the energy storage capacity constraint is not satisfied, let P2＝P2- Δ P iterates until EchThe constraint condition of energy storage capacity is met;
if Edisch,1Or Edisch,2If the energy storage capacity constraint is not satisfied, let P1＝P1+ Δ P iterations until Edisch,1And Edisch,2All satisfy the constraint condition of energy storage capacity;
if the energy storage correction electric quantity constraint is not satisfied on the premise that the energy storage capacity constraint is satisfied, then order P2＝P2- Δ P iterating until the energy storage correction electric quantity constraint is met;
if the energy storage charging and discharging amount balance constraint is not satisfied and the charging electric quantity is greater than the discharging electric quantity on the premise that the energy storage capacity constraint and the energy storage correction electric quantity constraint are both satisfied, then P is ordered2＝P2- Δ P iterating until an energy storage charge-discharge balance constraint is met;
if the energy storage charging and discharging amount balance constraint is not satisfied and the charging electric quantity is less than the discharging electric quantity on the premise that the energy storage capacity constraint and the energy storage correction electric quantity constraint are both satisfied, P is enabled1＝P1The + delta P is iterated until the energy storage charge-discharge quantity balance constraint is met;
under the premise that each constraint of the second constraint conditions is met, according to a formula
Figure RE-GDA0003633670470000051
Calculating the charging power at the t moment in the time period of the energy storage participating in the auxiliary peak regulation
Figure RE-GDA0003633670470000052
And discharge power at time t
Figure RE-GDA0003633670470000053
And outputting;
according to the final lower limit P of discharge power1And upper limit of charging power P2Determining a time period for the energy storage to participate in the auxiliary peak regulation;
wherein E ischFor the charging capacity during peak shaving periods of energy storage, Edisch,1For the first peak clipping period
Figure RE-GDA0003633670470000054
Amount of discharge electricity, Edisch,2For the second peak clipping period
Figure RE-GDA0003633670470000055
The amount of electricity is discharged,
Figure RE-GDA0003633670470000056
for the load power at the time t,
Figure RE-GDA0003633670470000057
in order to store the maximum charging power,
Figure RE-GDA0003633670470000058
the maximum discharge power is stored.
Preferably, the lower limit P of the discharge power is determined according to the average power of the load, the maximum power of the load and the minimum power of the load1And upper limit of charging power P2The initial values of (a) include:
lower limit of discharge power P1The initial value of (a) is set between the average power of the load and the maximum power of the load;
upper limit of charging power P2Is set between the load minimum power and the average power.
Preferably, the final lower limit P of the discharge power is1And upper limit of charging power P2Determining the time period for which the stored energy participates in the auxiliary peak shaving comprises:
the load power is higher than the lower limit P of the discharge power1And the period before the light abandoning period is used as the first peak clipping period
Figure RE-GDA0003633670470000059
The load power is higher than the lower limit P of the discharge power1And a period after the light discarding period is taken as a second peak clipping period
Figure RE-GDA0003633670470000061
Setting the load power at P1And P2The time period between the two is used as the energy storage non-action time period;
the load power is lower than the upper limit P of the charging power2As the charging period Tch。
Preferably, the second constraint condition is:
Figure RE-GDA0003633670470000062
wherein E is the energy storage capacity, Δ t is the charging power switching time interval, EiniAnd the initial value of the energy storage capacity for the energy storage to participate in the auxiliary peak regulation.
The beneficial effects of the invention are as follows:
1. aiming at the defects that the existing energy storage control strategy is only limited to a single application scene and cannot coordinate and control energy storage and simultaneously participate in new energy consumption and peak shaving auxiliary service, the method realizes energy storage hierarchical coordination control by reasonably dividing two application scenes. The photovoltaic power station can meet the requirement of light abandoning rate and improve the number of hours for energy storage utilization, can meet the application scenes of light abandoning and auxiliary peak regulation at the same time, is suitable for the photovoltaic power station with the light abandoning phenomenon, is favorable for the popularization of a new energy source and energy storage mode, and greatly improves the positivity of new energy source station configuration energy storage.
2. In the energy storage hierarchical coordination control, the first layer makes a control strategy by taking the light rejection rate reduction as a constraint in the light rejection stage, and energy storage control is performed by adopting the charging power of the light rejection time period and the charging power of the light rejection time period obtained by the strategy, so that the requirement of the light rejection rate can be met.
3. In the energy storage hierarchical coordination control, the second layer corrects the energy storage capacity and the load curve according to the configuration result of the first layer, adopts an improved power difference control method to make a charging and discharging strategy in an energy storage auxiliary peak shaving stage, adopts the auxiliary peak shaving time period obtained by the strategy and the charging power and the discharging power of the auxiliary peak shaving time period to carry out energy storage control, and can greatly improve the utilization hours of energy storage.
Drawings
Fig. 1 is a schematic flow chart of a coordinated control method of photovoltaic absorption and auxiliary peak shaving for energy storage according to the present invention;
FIG. 2 is a flow chart of a coordination control strategy for energy storage to facilitate photovoltaic absorption and participation in peak shaving auxiliary services in accordance with the present invention;
FIG. 3 is a flow chart of a light rejection strategy of the present invention;
FIG. 4 is a schematic diagram of energy storage charging and discharging during the light abandoning period;
FIG. 5 is a flow chart of an improved power difference control strategy;
FIG. 6 is a schematic diagram of energy storage charging and discharging during peak shaving period;
FIG. 7 is a graph of the light rejection curve of a preferred embodiment;
FIG. 8 is a load curve of a preferred embodiment;
FIG. 9 is a schematic diagram showing the comparison of the before and after discarding light after the energy storage participates in the absorption;
fig. 10 is a schematic diagram showing comparison of load curves before and after the energy storage participates in the peak shaving auxiliary service;
FIG. 11 is a schematic diagram of an energy storage output curve;
fig. 12 is a schematic diagram of a variation curve of energy storage capacity.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Example one
Fig. 1 and 2 show a schematic structural diagram of a coordinated control method for photovoltaic absorption and auxiliary peak shaving of energy storage according to a preferred embodiment of the present application (fig. 1 shows a first embodiment of the present application), and for convenience of description, only the parts related to the present embodiment are shown, and the detailed description is as follows:
the method comprises the following steps:
step 1, acquiring actual output data and theoretical maximum output data of a photovoltaic power station on a typical day, and determining a light abandoning time period and a light abandoning curve.
By collecting the actual sunrise output curve and the theoretical maximum output curve of the actual photovoltaic power station, the light abandoning curve of the photovoltaic power station can be obtained, as shown in the following formula:
Figure RE-GDA0003633670470000081
wherein the content of the first and second substances,
Figure RE-GDA0003633670470000082
is a photovoltaic theoretical output value at the time t,
Figure RE-GDA0003633670470000083
is the actual output value of the photovoltaic at the time t,
Figure RE-GDA0003633670470000091
and the photovoltaic light abandoning power at the time t is obtained.
Judgment formula
Figure RE-GDA0003633670470000092
And if so, the time period is the light abandoning time period.
And step 2, obtaining an energy storage charging time period according to the light abandoning curve, and executing an energy storage consumption control strategy in the light abandoning time period to obtain charging power. The specific control strategy is shown in fig. 3:
setting a lower limit P of the energy storage consumption abandoned optical power in the abandoned optical time periodcInitial value and iteration step length delta P, energy storage and abandon optical power lower limit PcTaking the initial value ofAny value between 0 and the maximum abandoned optical power;
judging whether a moment t meets a first constraint condition, wherein the first constraint condition comprises a light rejection rate constraint and an energy storage capacity constraint;
if so, according to the formula
Figure RE-GDA0003633670470000093
Calculating the charging power of the light abandoning time period at the time t
Figure RE-GDA0003633670470000094
And outputting;
if the light rejection rate constraint is not satisfied, let Pc＝Pc- Δ P is iterated until a first constraint is satisfied, and the new stored energy is discarded by the lower optical power limit PcSubstituting into formula
Figure RE-GDA0003633670470000095
Outputting charging power at time t
Figure RE-GDA0003633670470000096
If the energy storage capacity constraint is not satisfied, let Pc＝PcThe + delta P is iterated until a first constraint condition is met, and the new energy storage is consumed to abandon the lower limit P of the optical powercSubstituting into formula
Figure RE-GDA0003633670470000097
Outputting charging power at time t
Figure RE-GDA0003633670470000098
Wherein the content of the first and second substances,
Figure RE-GDA0003633670470000099
the photovoltaic light rejection power at the time t,
Figure RE-GDA00036336704700000910
the maximum charging power is stored.
Wherein the first constraint condition comprises:
Figure RE-GDA0003633670470000101
wherein eta is the light rejection rate required to be achieved, generally regarded as 5%, E is the energy storage capacity, delta t is the charging power switching time interval, i-j are light rejection time periods, RqgTo reject light rate, EpvThe actual photovoltaic power generation capacity in the period is calculated.
When the abandoned optical power is greater than PcWhen the power of the abandoned light is less than PcWhen the energy is stored, the energy storage is not operated. PcWhen t is equal to i, j, the energy storage charging time period is i-j, and the energy storage charging time period is as shown in fig. 4.
And 3, acquiring a daily load curve of the node system, and correcting the peak regulation time period and the initial value of the energy storage capacity of the load curve according to the energy storage charging time period and the charging power.
And (3) according to the time period for photovoltaic absorption of the stored energy determined in the previous step, the stored energy cannot participate in subsequent peak shaving, the time period is cut off in the load curve, and the load curve is divided into two intervals before and after absorption and light abandonment. Meanwhile, the SOC state of the stored energy is changed due to charging, and the initial capacity of the stored energy is no longer 0 in a time period after light is eliminated.
Thus, using the formula
Figure RE-GDA0003633670470000102
And correcting the peak regulation time interval and the initial value of the energy storage capacity of the load curve.
Wherein, TtfFor peak shaving periods, T is the duration of the day, TxnTo take away the light-off period, EiniFor the initial value of the energy storage capacity of the energy storage participating in the auxiliary peak shaving,
Figure RE-GDA0003633670470000103
and delta t is the charging power of the stored energy at the moment t, the switching time interval of the charging power is delta t, and E is the energy storage capacity.
And 4, determining the time period and the charging and discharging power of the energy storage participating in the auxiliary peak shaving according to the load curve after the peak shaving time period is corrected. The specific process is shown in fig. 5:
calculating according to the load curve after the peak regulation period to obtain the average load power, and determining the lower limit P of the discharge power according to the average load power, the maximum load power and the minimum load power1And upper limit of charging power P2And an iteration step size Δ P. In particular the charging power P1Is set between the average load power and the maximum load power, and the upper limit of the charging power is set to be P2The initial value of (b) is set between the minimum power and the average power of the load;
judging whether a second constraint condition is met at the moment t, wherein the second constraint condition comprises energy storage capacity constraint, energy storage correction electric quantity constraint and energy storage charge and discharge quantity balance constraint;
the second constraint condition is specifically:
Figure RE-GDA0003633670470000111
wherein E is the energy storage capacity, Δ t is the charging power switching time interval, EiniAnd the initial value of the energy storage capacity for the energy storage to participate in the auxiliary peak regulation.
If EchIf the energy storage capacity constraint is not satisfied, let P2＝P2- Δ P iterates until EchThe constraint condition of energy storage capacity is met;
if Edisch,1Or Edisch,2If the energy storage capacity constraint is not satisfied, let P1＝P1+ Δ P iterations until Edisch,1And Edisch,2All satisfy the constraint condition of energy storage capacity;
if the energy storage correction electric quantity constraint is not satisfied on the premise that the energy storage capacity constraint is satisfied, then P is enabled2＝P2- Δ P iterating until the energy storage correction electric quantity constraint is met;
if the energy storage capacity constraint and the energy storage correction electric quantity constraint are both satisfied, the energy storage charging and discharging quantity balance constraint is not satisfiedBinding, and making P be greater than discharge electric quantity2＝P2- Δ P iterating until an energy storage charge-discharge balance constraint is met;
if the energy storage charging and discharging amount balance constraint is not satisfied and the charging electric quantity is less than the discharging electric quantity on the premise that the energy storage capacity constraint and the energy storage correction electric quantity constraint are both satisfied, P is enabled1＝P1The + delta P is iterated until the energy storage charge-discharge quantity balance constraint is met;
on the premise that each constraint of the second constraint condition is satisfied, according to a formula
Figure RE-GDA0003633670470000121
Calculating the charging power at the t moment in the time period of the energy storage participating in the auxiliary peak regulation
Figure RE-GDA0003633670470000122
And discharge power at time t
Figure RE-GDA0003633670470000123
And outputting;
according to the final lower limit P of discharge power1And upper limit of charging power P2Determining the time period of the energy storage participating in the auxiliary peak regulation, specifically: the load power is higher than the lower limit P of the discharge power1And a period before the light abandoning period is used as a first peak clipping period
Figure RE-GDA0003633670470000124
The load power is higher than the lower limit P of the discharge power1And a period after the light discarding period is taken as a second peak clipping period
Figure RE-GDA0003633670470000125
Setting the load power at P1And P2The time period between the two is used as the energy storage non-action time period;
the load power is lower than the upper limit P of the charging power2As the charging period TchTool for measuringThe body is shown in figure 6;
in this step, EchCharging capacity for peak shaving period of energy storage, Edisch,1For the first peak clipping period
Figure RE-GDA0003633670470000126
Amount of discharge electric power, Edisch,2For the second peak clipping period
Figure RE-GDA0003633670470000127
The amount of electricity is discharged,
Figure RE-GDA0003633670470000128
for the load power at the time t,
Figure RE-GDA0003633670470000129
in order to store the maximum charging power,
Figure RE-GDA00036336704700001210
storing the maximum discharge power;
and 5, performing energy storage all-day charging and discharging control according to the light abandoning time period, the auxiliary peak regulation time period, the charging power stored in the light abandoning time period, the charging power stored in the auxiliary peak regulation time period and the discharging power.
By the formula
Figure RE-GDA0003633670470000131
The load peak-to-valley difference rate can be calculated.
By the formula Itf＝(Edisch,1+Edisch,2) B can calculate the profit of the energy storage participating in the peak shaving auxiliary service, wherein ItfAnd B is the peak regulation compensation price.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Example two
The effectiveness and the rationality of the evaluation method provided by the invention are verified by taking certain actual photovoltaic power station data as an embodiment.
The maximum power of the photovoltaic power station in the embodiment is 20MW, and the load peak value is 49.5 MW. The capacity of the energy storage battery is 12MWh, and the maximum charge-discharge power is 3 MW.
The light rejection curve of the photovoltaic power station and the load curve of the system are shown in figures 7 and 8. The initial light rejection was 12.84%, the peak-to-valley difference was 13.65MW, and the peak-to-valley difference was 27.57%. The iteration step Δ P is set to 0.01 MW.
1) Results of the examples
Obtaining P according to a light abandoning strategycWhen the energy storage, absorption and light abandonment time interval is 10:00-14:00 and the total charge capacity is 5.8MWh, the MW is 0.51 MW. The comparison of the abandoned light before and after the energy storage is shown in FIG. 9.
The time period of the corrected load curve is 0:00-10:00, 14:00-24:00, and the initial capacity of the stored energy Eini＝6.2MWh。
Deriving P from an improved power difference control strategy1＝45.45MW,P2And when the energy storage auxiliary peak-shaving charging and discharging time interval is 38.12MW, the charging and discharging amount is positive to indicate energy storage charging, and the charging and discharging amount is negative to indicate energy storage discharging. As shown in table 1.
TABLE 1 energy storage peak shaving period charge and discharge strategy
Period of action Charging and discharging capacity (MWh)
Energy storage charging 0:00-5:00 +10.6631
First discharge of stored energy 7:00-9:00 -4.4733
Second discharge of stored energy 16:00-21:00 -11.9898
The comparison of the load curves before and after the energy storage participation peak shaving auxiliary service is shown in figure 10.
The final energy storage all-day charge and discharge power and charge and discharge quantity obtained by integrating the calculation are shown in figures 11 and 12.
2) Analysis of results
The technical index pairs before and after the energy storage participates in the light abandonment and peak shaving auxiliary service are shown in table 2.
TABLE 2 comparison of technical indexes before and after participation of energy storage
Light rejection Peak valley difference (MW) Peak to valley difference rate
Before the energy storage participates 12.84％ 13.65 27.57％
After the energy storage participates 4.98％ 8.38 18.02％
Therefore, the energy storage coordination control strategy for promoting photovoltaic absorption and participating in the peak shaving auxiliary service provided by the invention can ensure that the energy storage configured by the photovoltaic power station can optimize the system load curve, increase the utilization hours of the energy storage and improve the positivity of the energy storage configured by the photovoltaic power station by participating in the peak shaving auxiliary service market on the premise of meeting the light abandoning rate requirement of the photovoltaic power station.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and they should be construed as being included in the present application.

Claims (10)

1. A coordination control method for promoting photovoltaic absorption and participating in peak shaving auxiliary service by energy storage is characterized by comprising the following steps:
acquiring actual output data and theoretical maximum output data of a photovoltaic power station on a typical day, and determining a light abandoning time period and a light abandoning curve;
obtaining an energy storage charging time period according to the light abandoning curve, and executing an energy storage consumption control strategy in the light abandoning time period to obtain charging power;
acquiring a daily load curve of a node system, and correcting a peak regulation time period and an initial value of energy storage capacity of the load curve according to the energy storage charging time period and the charging power;
determining the time period and the charging and discharging power of the energy storage participating in the auxiliary peak shaving according to the load curve after the peak shaving time period is corrected;
and performing energy storage all-day charging and discharging control according to the light abandoning time period, the auxiliary peak regulation time period, the charging power of the stored energy in the light abandoning time period, the charging power and the discharging power of the auxiliary peak regulation time period.
2. The method for coordinated control of energy storage-facilitated photovoltaic consumption and participation in peak shaving assistance services as claimed in claim 1, wherein said method for determining the period of light curtailment comprises:
judgment formula
Figure RE-FDA0003633670460000011
Whether the time period is established or not is judged, if so, the time period is a light abandoning time period;
wherein the content of the first and second substances,
Figure RE-FDA0003633670460000012
is a photovoltaic theoretical output value at the time t,
Figure RE-FDA0003633670460000013
is the actual output value of the photovoltaic power at the moment t,
Figure RE-FDA0003633670460000014
and the photovoltaic light abandoning power at the time t is obtained.
3. The method of claim 1, wherein the step of executing the energy storage consumption control strategy during the light abandonment period to obtain the charging power during the light abandonment period comprises:
setting a lower limit P of the energy storage consumption abandoned optical power in the abandoned optical time periodcThe initial value and the iteration step length delta P;
judging whether a first constraint condition is met at the moment t, wherein the first constraint condition comprises a light rejection rate constraint and an energy storage capacity constraint;
if so, according to the formula
Figure RE-FDA0003633670460000021
Calculating the charging power of the light abandoning time period at the t moment
Figure RE-FDA0003633670460000022
And outputting;
if the light rejection rate constraint is not satisfied, let Pc＝Pc- Δ P is iterated until a first constraint is satisfied, and the new stored energy is discarded by the lower optical power limit PcSubstituting into formula
Figure RE-FDA0003633670460000023
Outputting charging power at time t
Figure RE-FDA0003633670460000024
If the energy storage capacity constraint is not satisfied, let Pc＝PcThe + delta P is iterated until a first constraint condition is met, and the new energy storage is consumed to abandon the lower limit P of the optical powercSubstituting into formula
Figure RE-FDA0003633670460000025
Outputting charging power at time t
Figure RE-FDA0003633670460000026
Wherein, the first and the second end of the pipe are connected with each other,
Figure RE-FDA0003633670460000027
the photovoltaic light rejection power at the time t,
Figure RE-FDA0003633670460000028
the maximum charging power is stored.
4. The method as claimed in claim 3, wherein the energy storage consumption curtailment optical power lower limit P is a lower limit of energy storage consumption curtailment optical powercThe initial value of (2) is any value between 0 and the maximum abandoned optical power.
5. The method for coordinating and controlling photovoltaic absorption and participation in peak shaving auxiliary services according to claim 3, wherein the first constraint condition comprises:
Figure RE-FDA0003633670460000029
wherein eta is the light rejection rate required to be achieved, E is the energy storage capacity, delta t is the charging power switching time interval, i-j are the light rejection time interval, RqgTo reject ratio, EpvThe actual photovoltaic power generation capacity in the period is calculated.
6. The method of claim 1, wherein the step of correcting the peak shaving period and the initial value of the energy storage capacity of the load curve according to the energy storage charging period and the charging capacity comprises:
using formulas
Figure RE-FDA0003633670460000031
Correcting the peak regulation time interval and the initial value of the energy storage capacity of the load curve;
wherein, TtfFor peak shaving periods, T is the duration of the day, TxnTo take away the light-off period, EiniFor the initial value of the energy storage capacity of the energy storage participating in the auxiliary peak shaving,
Figure RE-FDA0003633670460000032
and delta t is the charging power of the stored energy at the moment t, the switching time interval of the charging power is delta t, and E is the energy storage capacity.
7. The method of claim 1, wherein determining the time period and the charging/discharging power for the energy storage to participate in the auxiliary peak shaving according to the load curve after the peak shaving period is corrected comprises:
calculating according to the load curve after the peak regulation period to obtain the average load power, and determining the lower limit P of the discharge power according to the average load power, the maximum load power and the minimum load power1And upper limit of charging power P2And an iteration step size Δ P;
judging whether a second constraint condition is met at the moment t, wherein the second constraint condition comprises energy storage capacity constraint, energy storage correction electric quantity constraint and energy storage charge and discharge quantity balance constraint;
if EchIf the energy storage capacity constraint is not satisfied, let P2＝P2- Δ P iterates until EchThe constraint condition of energy storage capacity is met;
if Edisch,1Or Edisch,2If the energy storage capacity constraint is not satisfied, let P1＝P1+ Δ P iterations until Edisch,1And Edisch,2All satisfy the constraint condition of energy storage capacity;
if the energy storage correction electric quantity constraint is not satisfied on the premise that the energy storage capacity constraint is satisfied, then order P2＝P2- Δ P iterating until the energy storage correction electric quantity constraint is met;
if the energy storage charging and discharging amount balance constraint is not satisfied and the charging electric quantity is greater than the discharging electric quantity on the premise that the energy storage capacity constraint and the energy storage correction electric quantity constraint are both satisfied, then P is ordered2＝P2- Δ P iterating until an energy storage charge-discharge balance constraint is met;
if the energy storage capacity constraint and the energy storage correction electric quantity constraint are both satisfied,if the energy storage charge and discharge capacity balance constraint is not satisfied and the charge capacity is less than the discharge capacity, P is set1＝P1The + delta P is iterated until the energy storage charge-discharge quantity balance constraint is met;
on the premise that each constraint of the second constraint condition is satisfied, according to a formula
Figure RE-FDA0003633670460000041
Calculating the charging power at the t moment in the time period of the energy storage participating in the auxiliary peak regulation
Figure RE-FDA0003633670460000042
And discharge power at time t
Figure RE-FDA0003633670460000043
And outputting;
according to the final lower limit P of discharge power1And upper limit of charging power P2Determining a time period for the energy storage to participate in the auxiliary peak regulation;
wherein E ischFor the charging capacity during peak shaving periods of energy storage, Edisch,1For the first peak clipping period
Figure RE-FDA0003633670460000044
Amount of discharge electric power, Edisch,2For the second peak clipping period
Figure RE-FDA0003633670460000045
The amount of electricity is discharged,
Figure RE-FDA0003633670460000046
for the load power at the time t,
Figure RE-FDA0003633670460000047
in order to store the maximum charging power,
Figure RE-FDA0003633670460000048
the maximum discharge power is stored.
8. The method for coordinating and controlling energy storage-facilitated photovoltaic consumption and participation in peak shaving auxiliary services according to claim 7, wherein a lower discharging power limit P is determined according to the load average power, the load maximum power and the load minimum power1And upper limit of charging power P2The initial values of (a) include:
lower limit of discharge power P1The initial value of (a) is set between the average power of the load and the maximum power of the load;
upper limit of charging power P2Is set between the load minimum power and the average power.
9. The method for coordinating control of energy storage-facilitated photovoltaic consumption and participation in peak shaving auxiliary services according to claim 7, wherein said lower limit P is based on a final discharge power1And upper limit of charging power P2Determining the time period for which the stored energy participates in the auxiliary peak shaving comprises:
the load power is higher than the lower limit P of the discharge power1And the period before the light abandoning period is used as the first peak clipping period
Figure RE-FDA0003633670460000051
The load power is higher than the lower limit P of the discharge power1And a period after the light discarding period is taken as a second peak clipping period
Figure RE-FDA0003633670460000052
Setting the load power at P1And P2The time period between the two is used as the energy storage non-action time period;
the load power is lower than the upper limit P of the charging power2As a charging period Tch。
10. The method for coordinating and controlling photovoltaic absorption promotion and participation in peak shaving auxiliary service according to claim 7, wherein the second constraint condition is:
Figure RE-FDA0003633670460000053
wherein E is the energy storage capacity, Δ t is the charging power switching time interval, EiniAnd the initial value of the energy storage capacity for the energy storage to participate in the auxiliary peak regulation.
CN202111497566.6A 2021-12-09 2021-12-09 Photovoltaic absorption and auxiliary peak regulation coordination control method for energy storage Pending CN114665514A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115189375A (en) * 2022-07-26 2022-10-14 洛阳理工学院 Charging period selection method for multipoint-distributed energy storage power station participating in power grid peak shaving

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115189375A (en) * 2022-07-26 2022-10-14 洛阳理工学院 Charging period selection method for multipoint-distributed energy storage power station participating in power grid peak shaving

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