CN113067349A - Frequency emergency control method in island operation mode - Google Patents
Frequency emergency control method in island operation mode Download PDFInfo
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- CN113067349A CN113067349A CN202110343543.3A CN202110343543A CN113067349A CN 113067349 A CN113067349 A CN 113067349A CN 202110343543 A CN202110343543 A CN 202110343543A CN 113067349 A CN113067349 A CN 113067349A
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- 238000004146 energy storage Methods 0.000 claims abstract description 28
- 150000001875 compounds Chemical class 0.000 claims description 15
- 238000004378 air conditioning Methods 0.000 claims description 13
- 230000033228 biological regulation Effects 0.000 claims description 11
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
- H02J3/28—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
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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Abstract
The invention discloses a frequency emergency control method in an island operation mode, which comprises the following steps: (1) acquiring the up-down adjustment capacity of the adjustable capacity calculated by the control target; (2) calculating and dynamically adjusting a droop control coefficient by acquiring the upper and lower adjusting capacity; (3) and calculating the required adjustment amount according to the frequency offset and the droop control coefficient. The invention aims at adopting a droop control mode for the energy storage battery, the air conditioner and the electric automobile, simultaneously considers the SOC state of the energy storage battery and the operating characteristics of the air conditioner and the electric automobile, and changes the energy storage battery, the air conditioner and the electric automobile into adjustable resources through a control means on the premise of not influencing the production and life of residents to participate in the frequency modulation service of the micro-grid, thereby improving the frequency quality of the micro-grid.
Description
Technical Field
The invention relates to a frequency emergency control method in an island operation mode, and belongs to the technical field of frequency emergency control.
Background
The existing micro-grid operation control uses synchronous power supplies such as a gas turbine, a diesel engine and the like as main power supplies, and is matched with distributed power supplies such as wind power, photovoltaic and the like to jointly supply power for micro-grid loads. Because wind Power and photovoltaic are obviously affected by the operation condition, the active Power has stronger volatility and randomness, and the Maximum Power Point Tracking (MPPT) control is generally adopted, so that the MPPT does not participate in the frequency regulation of the system, the frequency fluctuation of the micro-grid is larger, and the active regulation capability is weaker. The adjustment quantity of various adjustable resources is related to the self state and the user requirement by considering the adjustment characteristics of the energy storage battery, the air conditioner and the electric automobile. For the energy storage battery, the adjustment capacity is related to the SOC, wherein the SOC represents the Charge amount (SOC), the Charge and discharge power of the energy storage battery is reasonably controlled to keep a good SOC State, a large adjustable range is provided, the discharge depth of the battery is reduced, the service life of the battery is prolonged, for the electric vehicle, the travel requirement of a user needs to be considered for determining the adjustment capacity, and the minimum loss degree of the battery is ensured. For the air conditioner, the adjustment capacity needs to be determined by considering the comfort requirement of a user, and the adjustment capacity is reasonably controlled according to the current running state of the air conditioner and the change of the indoor temperature.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the frequency emergency control method in the island operation mode is provided to solve the problems in the prior art.
The technical scheme adopted by the invention is as follows: a method for emergency frequency control in an islanding mode of operation, the method comprising the steps of:
(1) acquiring the up-down adjustment capacity of the adjustable capacity calculated by the control target;
(2) calculating and dynamically adjusting a droop control coefficient by acquiring the upper and lower adjusting capacity;
(3) and calculating the required adjustment amount according to the frequency offset and the droop control coefficient.
The calculation formula for dynamically adjusting the droop control coefficient in the step (2) is as follows:
in the formula: kdroop1And Kdroop2Respectively representing the droop coefficients of the frequency during the frequency up-regulation and the frequency down-regulation, namely Hz/kW; pupAnd PdownRespectively representing the upper and lower regulation capacity, kW, of a control target; f. ofmax＝50.5Hz、fmin49.5Hz and fN50Hz is the frequency maximum, minimum and nominal frequency, Hz, respectively, for droop control.
The control target in the step (1) comprises an energy storage battery, an air conditioner and an electric automobile.
The method for determining the up-down regulation capacity of the energy storage battery comprises the following steps: the maximum discharge power of the energy storage battery considering the SOC is calculated by:
in the formula, Pc,max、Pd,maxRepresenting the maximum charge and discharge power, kW, of the stored energy in consideration of the SOC state; qSOCRepresenting the SOC of the current energy storage battery; a is1、a2、b1、b2、c1、c2、d1、d2All are constant coefficients.
The average tuning capacity is shown below:
in the formula: p0Representing the average conditioning capacity, kW.
The method for determining the up-down regulation capacity of the air conditioner comprises the following steps:
(1) determining the on-off state of the air conditioner at the initial moment;
(2) adjustable capacity at the initial time;
in the formula, Pup、PdownCapacity that can be adjusted up and capacity that can be adjusted down, kW, that represent air conditioning load; pNRepresenting the rated power of the air conditioner, kW; n is a radical of1Representing the number of the on-state air conditioners; n is a radical of2Representing the number of the off-state air conditioners;
(3) update indoor temperature with increasing time:
in the formula, Tin(tn+1)、Tin(tn) Represents tn+1And tnIndoor temperature at that moment, DEG C; Δ t represents the frequency modulation duration, h; C. r respectively represents the heat capacity and the heat resistance of the room, and the unit is respectively as follows: F. omega; t isout(tn) Represents tnThe outdoor temperature at that time, DEG C; m (t)n) Represents tnThe air-conditioning state at the moment, the value of which is 1 indicates that the air-conditioning state is in an on state, and the value of which is 0 indicates that the air-conditioning state is in an off state;
(4) updating the on-off state of the air conditioner;
in the formula, m (t)n)、m(tn-1) Represents tnAnd tn-1The air conditioning state at that moment; t isin(tn) Represents the indoor temperature at time tn, ° c; t isset_min、Tset_maxRespectively representing the minimum value and the maximum value, DEG C, of the critical temperature of the change of the air conditioner operation state.
The method for determining the up-down adjustment capacity of the adjustable capacity of the electric automobile comprises a method for determining the up-down adjustment capacity and a method for determining the down-down adjustment capacity.
The method for determining the adjustable capacity comprises the following steps:
the capacity of the electric automobile is adjusted up without affecting the travel demand and the battery life of a user, and the minimum electric quantity and the discharge depth of the electric automobile after the frequency modulation are specified are shown as the following formula (9-10):
in the formula (I), the compound is shown in the specification,
the minimum value of the allowed electric quantity of the ith electric automobile after the frequency modulation is finished is represented, so that the travel requirement of a user is guaranteed;
represents a desired amount of power of the user i;
representing the rated charging power, kW (negative); etaEVThe charge and discharge efficiency is shown;
represents a desired charging time, h, for user i; cEV,iIndicating the capacity of the ith electric vehicle, kWh;
the charge quantity of the ith electric automobile at the frequency modulation starting time t is represented; dmaxIndicating the maximum depth of discharge allowed.
The maximum charge-discharge power of the electric automobile during the frequency modulation period is shown as the formula (10):
in the formula (I), the compound is shown in the specification,
the difference value of the initial electric quantity of the electric automobile and the minimum electric quantity allowed by the end of frequency modulation is obtained; when in use
And the real-time adjustable capacity of the electric automobile is as follows:
in the formula (I), the compound is shown in the specification,
representing the adjustable capacity, kW, of the ith electric vehicle;
the up-regulation capacity, kW, which can be provided by the cluster electric automobile is represented; n represents the number of electric vehicles.
Method for determining the down-regulated capacity:
if the current grid-connected power of the electric automobile is smaller than the maximum charging power and the electric quantity is not full, the frequency is adjusted downwards, and the maximum charging power allowed by the electric automobile is adjusted
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
representing the difference value between the electric quantity of the electric automobile before frequency modulation and the maximum electric quantity; when in use
When it is, electric steam is usedThe vehicle has a space for downwards frequency modulation, namely the capacity of the electric vehicle can be adjusted downwards in real time as follows:
in the formula (I), the compound is shown in the specification,
indicating the down-regulation capacity, kW, which can be provided by the ith electric vehicle;
indicating the turndown capacity, kW, that the cluster electric vehicle can provide.
Calculating the required adjustment amount:
in the formula: kdroop1And Kdroop2Respectively representing the droop coefficients of the frequency during the frequency up-regulation and the frequency down-regulation, namely Hz/kW; p1And P2Respectively representing the actual regulating quantity, kW, of the control target; and Δ f represents the deviation of the actual frequency from the nominal frequency, Hz.
The invention has the beneficial effects that: compared with the prior art, the invention adopts a droop control mode for the energy storage battery, the air conditioner and the electric automobile, simultaneously considers the SOC state of the energy storage battery and the operating characteristics of the air conditioner and the electric automobile, and changes the energy storage battery, the air conditioner and the electric automobile into adjustable resources through a control means on the premise of not influencing the production and life of residents to participate in the micro-grid frequency modulation service, thereby improving the frequency quality of the micro-grid.
Drawings
FIG. 1 is a SOC operation interval division diagram of an energy storage battery
FIG. 2 is a frequency modulation diagram of 50 air conditioners;
FIG. 3 is a frequency modulation diagram of 30 air conditioners;
FIG. 4 is a schematic diagram of a dispatchable capacity of an electric vehicle;
FIG. 5 is a graph of droop coefficient as a function of desired charge time for 2-4 h;
FIG. 6 is a graph of droop coefficient as a function of desired charge 1h time;
FIG. 7 is a flow chart of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example (b): a frequency emergency control method in an island operation mode comprises the following steps:
step one, acquiring the up-down adjustment capacity of the calculated adjustable capacity of a control target;
calculating and dynamically adjusting a droop control coefficient by acquiring the upper and lower adjusting capacity;
and step three, calculating the required adjustment amount according to the frequency offset and the droop control coefficient.
Wherein, the step of calculating the dynamic adjustment droop control coefficient by obtaining the up-down adjustment capacity comprises the droop control coefficient calculated by the following formula:
droop coefficient dynamic adjustment formula:
in the formula: kdroop1And Kdroop2Respectively representing the droop coefficients of the frequency during the frequency up-regulation and the frequency down-regulation, namely Hz/kW; pupAnd PdownRespectively representing the upper and lower regulation capacity, kW, of a control target; f. ofmax＝50.5Hz、fmin49.5Hz and fN50Hz is the frequency maximum, minimum and nominal frequency, Hz, respectively, for droop control.
Example 1: as shown in fig. 1 to 7, in an emergency frequency control method in an islanding operation mode, a control target is an energy storage battery:
acquiring the up-down adjustment capacity of the calculated adjustable capacity of the control target:
the service life of the energy storage battery is related to the State of Charge (SOC), and the SOC operation interval of the energy storage battery is divided as shown in fig. 1:
the determination of the adjustable capacity of the energy storage battery needs to take the SOC state and the maximum charge-discharge power into account, and in order to prevent the SOC of a BESS (battery energy storage station) from exceeding the limit, when the SOC of the BESS is lower, the maximum discharge power P is reducedd,max(ii) a When the SOC of BESS is high, the maximum charging power P is reducedc,max. When the SOC is too high (more than 0.9) or too low (less than 0.1), charging (discharging) is stopped accordingly.
The maximum discharge power of the energy storage cell, taking into account the SOC, can be calculated by:
in the formula, Pc,max、Pd,maxRepresenting the maximum charge and discharge power, kW, of the stored energy in consideration of the SOC state; qSOCRepresenting the SOC of the current energy storage battery; a is1、a2、b1、b2、c1、c2、d1、d2All are constant coefficients.
The average tuning capacity is shown below:
in the formula: p0Representing the average conditioning capacity, kW.
Calculating a dynamically adjusted droop control coefficient by obtaining the up-down adjustment capacity:
considering the SOC and the adjustable capacity of the energy storage battery, and dynamically adjusting the droop coefficient KdroopAnd the output can control the frequency deviation of the microgrid within a reasonable range and can prevent the BESS from being overcharged or overdischarged.
The formula for dynamically adjusting the droop coefficient of the energy storage battery is as follows:
in the formula: kdroopThe droop control coefficient is represented and changes along with the change of the regulating capacity of the energy storage battery; f. ofmax＝50.5Hz、fmin49.5Hz indicates the frequency maximum and minimum for droop control, Hz, respectively.
Example 2: the control target is an air conditioner:
acquiring the up-down adjustment capacity of the calculated adjustable capacity of the control target:
(1) determining the on-off state of the air conditioner at the initial moment;
(2) adjustable capacity at the initial time;
in the formula, Pup、PdownCapacity that can be adjusted up and capacity that can be adjusted down, kW, that represent air conditioning load; pNRepresenting the rated power of the air conditioner, kW; n is a radical of1Representing the number of the on-state air conditioners; n is a radical of2Representing the number of the off-state air conditioners;
(3) update indoor temperature with increasing time:
in the formula, Tin(tn+1)、Tin(tn) Represents tn+1And tnIndoor temperature at that moment, DEG C; Δ t represents the frequency modulation duration, h; C. r respectively represents the heat capacity and the heat resistance of the room, and the unit is respectively as follows: F. omega; t isout(tn) Represents tnThe outdoor temperature at that time, DEG C; m (t)n) Represents tnIn the air-conditioning state at the time, a value of 1 indicates an on state, and a value of 0 indicates an off state.
(4) Updating the on-off state of the air conditioner;
in the formula, m (t)n)、m(tn-1) Represents tnAnd tn-1The air conditioning state at that moment; t isin(tn) Represents tnIndoor temperature at that moment, DEG C; t isset_min、Tset_maxRespectively representing the minimum value and the maximum value, DEG C, of the critical temperature of the change of the air conditioner operation state.
Calculating a dynamically adjusted droop control coefficient by obtaining the up-down adjustment capacity:
considering the change of room temperature, updating the on-off state and adjustable capacity of the air conditioner, and dynamically adjusting the droop control coefficient Kdroop. And calculating the required regulating quantity according to the frequency deviation and the droop coefficient, matching the required regulating quantity as much as possible by controlling the starting and stopping of the air conditioner, and recovering the state of the air conditioner to the state of the frequency modulation starting moment when the frequency is stable.
The air conditioner droop coefficient dynamic adjustment formula is as follows:
in the formula: kdroop1、Kdroop2Respectively representing the droop coefficients of the frequency during the frequency up-regulation and the frequency down-regulation, namely Hz/kW; pup、PdownRespectively representing the up-down regulation capacity, kW, of the air conditioner; f. ofmax＝50.5Hz、fmin49.5Hz and fNThe 50Hz is the maximum value, the minimum value and the rated frequency of the droop control respectively.
Taking 50 air conditioners participating in frequency modulation as an example, suppose that the rated power P of the air conditionersN＝1kW，Tset_min＝26℃，Tset_maxAs shown in fig. 2-3, room thermal resistance, heat capacity, and initial indoor temperature follow a normal distribution:
R～N(1.74,5)
C～N(150,1)
Tin～N(27,0.5)
example 3: the control target is an electric automobile:
acquiring the up-down adjustment capacity of the calculated adjustable capacity of the control target:
the electric vehicle can realize the frequency modulation auxiliary service of the power grid by changing the charging and discharging power, and the specific implementation process is shown in fig. 4 below.
In the context of figure 4, it is shown,
the maximum frequency modulation charging and discharging power, kW, allowed after the travel demand of the electric vehicle user and the battery loss are considered.
The maximum charge and discharge power, kW, of the electric vehicle, respectively.
Is the current grid-connected power of the electric automobile, kW. t is tfIs the duration, h, used for frequency modulation. If the user's demand and the battery consumption are considered, the method can be used
Between
And
the up and down frequency modulation capacity can be provided.
(1) Determination of an adjustable volume
The capacity of the electric automobile is adjusted up without affecting the travel demand and the battery life of a user, and the minimum electric quantity and the discharge depth of the electric automobile after the frequency modulation are specified are shown in the following two formulas:
in the formula (I), the compound is shown in the specification,
the minimum value of the allowed electric quantity of the ith electric automobile after the frequency modulation is finished is represented, so that the travel requirement of a user is guaranteed;
represents a desired amount of power of the user i;
representing the rated charging power, kW (negative); etaEVThe charge and discharge efficiency is shown;
represents a desired charging time of user i; cEV,iIndicating the capacity of the ith electric vehicle, kWh;
indicating the ith vehicleThe electric quantity of the electric automobile at the starting moment t of frequency modulation; dmaxIndicating the maximum depth of discharge allowed.
The maximum charge and discharge power of the electric vehicle during frequency modulation is shown as follows:
in the formula (I), the compound is shown in the specification,
the difference value between the initial electric quantity of the electric automobile and the minimum electric quantity allowed by the end of frequency modulation is obtained. When in use
And the time indicates that the electric automobile can change the grid-connected power to realize the frequency up-regulation. At the moment, the real-time adjustable capacity of the electric automobile is as follows:
in the formula (I), the compound is shown in the specification,
representing the adjustable capacity, kW, of the ith electric vehicle;
the up-regulation capacity, kW, which can be provided by the cluster electric automobile is represented; n represents the number of electric vehicles.
(2) Determination of downregulated capacity
If the current grid-connected power of the electric automobile is smaller than the maximum charging power and the electric quantity is not full, the frequency can be adjusted downwards. Maximum charging power allowed by electric automobile
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
and representing the difference value between the electric quantity of the electric automobile before frequency modulation and the maximum electric quantity. When in use
And the time, the electric automobile has a space for downwards frequency modulation, namely the capacity of the electric automobile can be adjusted downwards in real time as follows:
in the formula (I), the compound is shown in the specification,
indicating the down-regulation capacity, kW, which can be provided by the ith electric vehicle;
indicating the turndown capacity, kW, that the cluster electric vehicle can provide.
Calculating a dynamically adjusted droop control coefficient by obtaining the up-down adjustment capacity:
considering the travel demand and the depth of discharge of a user, determining real-time adjustable capacity, and dynamically adjusting a droop control coefficient Kdroop. And when the frequency is recovered to be stable, the charging and discharging power of the electric automobile is recovered to the rated charging power.
The droop coefficient dynamic adjustment formula of the electric automobile is as follows:
in the formula, Kdroop1、Kdroop2Respectively representing the droop coefficients of the frequency during the frequency up-regulation and the frequency down-regulation, namely Hz/kW; pEV,up、PEV,downRespectively representing the up-down regulation capacity, kW, of the electric automobile; f. ofmax＝50.5Hz、fmin49.5Hz and fNThe 50Hz is the maximum value, the minimum value and the rated frequency of the droop control respectively.
Assuming rated charging power P of electric automobiled,NThe maximum charge and discharge power is P respectively as-3 kWd,max＝5kW，Pc,maxThe electric automobile capacity is 40kw.h, the charge-discharge efficiency is 0.95, and the expected charge capacity is 85%. The droop coefficient as a function of desired charge time is shown in fig. 5-6:
the above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.
Claims (9)
1. A frequency emergency control method in an island operation mode is characterized in that: the method comprises the following steps:
(1) acquiring the up-down adjustment capacity of the adjustable capacity calculated by the control target;
(2) calculating and dynamically adjusting a droop control coefficient by acquiring the upper and lower adjusting capacity;
(3) and controlling the coefficient according to the frequency offset and the droop.
2. The method according to claim 1, wherein the method for controlling the frequency emergency in the islanding operation mode comprises the following steps: the calculation formula for dynamically adjusting the droop control coefficient in the step (2) is as follows:
in the formula: kdroop1And Kdroop2Respectively representing the droop coefficients of the frequency during the frequency up-regulation and the frequency down-regulation, namely Hz/kW; pupAnd PdownRespectively representing the upper and lower regulation capacity, kW, of a control target; f. ofmax＝50.5Hz、fmin49.5Hz and fN50Hz is the frequency maximum, minimum and nominal frequency, Hz, respectively, for droop control.
3. The method according to claim 2, wherein the method for controlling the frequency emergency in the islanding operation mode comprises the following steps: the control target in the step (1) comprises an energy storage battery, an air conditioner and an electric automobile.
4. A method according to claim 3, wherein the method comprises the following steps: the method for determining the up-down regulation capacity of the energy storage battery comprises the following steps: the maximum discharge power of the energy storage battery considering the SOC is calculated by:
in the formula, Pc,max、Pd,maxRepresenting the maximum charge and discharge power, kW, of the stored energy in consideration of the SOC state; qSOCRepresenting the SOC of the current energy storage battery; a is1、a2、b1、b2、c1、c2、d1、d2All are constant coefficients.
5. A method according to claim 3, wherein the method comprises the following steps: the method for determining the up-down regulation capacity of the air conditioner comprises the following steps:
(1) determining the on-off state of the air conditioner at the initial moment;
(2) adjustable capacity at the initial time;
in the formula, Pup、PdownCapacity that can be adjusted up and capacity that can be adjusted down, kW, that represent air conditioning load; pNRepresenting the rated power of the air conditioner, kW; n is a radical of1Representing the number of the on-state air conditioners; n is a radical of2Representing the number of the off-state air conditioners;
(3) update indoor temperature with increasing time:
in the formula, Tin(tn+1)、Tin(tn) Represents tn+1And tnIndoor temperature at that moment, DEG C; Δ t represents the frequency modulation duration, h; C. r respectively represents the heat capacity and the heat resistance of the room, and the unit is respectively as follows: F. omega; t isout(tn) Represents tnThe outdoor temperature at that time, DEG C; m (t)n) Represents tnThe air-conditioning state at the moment, the value of which is 1 indicates that the air-conditioning state is in an on state, and the value of which is 0 indicates that the air-conditioning state is in an off state;
(4) updating the on-off state of the air conditioner;
in the formula, m (t)n)、m(tn-1) Represents tnAnd tn-1The air conditioning state at that moment; t isin(tn) Represents tnIndoor temperature at that moment, DEG C; t isset_min、Tset_maxRespectively representing the minimum value and the maximum value, DEG C, of the critical temperature of the change of the air conditioner operation state.
6. A method according to claim 3, wherein the method comprises the following steps: the method for determining the up-down adjustment capacity of the adjustable capacity of the electric automobile comprises a method for determining the up-down adjustment capacity and a method for determining the down-down adjustment capacity.
7. The method according to claim 6, wherein the method for controlling the frequency emergency in the islanding operation mode comprises the following steps: the method for determining the adjustable capacity comprises the following steps:
the minimum electric quantity and the discharge depth of the electric automobile after the frequency modulation is specified are shown as the following formula (9-10):
in the formula (I), the compound is shown in the specification,
the minimum value of the allowed electric quantity of the ith electric automobile after the frequency modulation is finished is represented, so that the travel requirement of a user is guaranteed;
represents a desired amount of power of the user i;
representing the rated charging power, kW (negative); etaEVThe charge and discharge efficiency is shown;
represents a desired charging time, h, for user i; cEV,iRepresenting the capacity of the ith electric vehicle;
the charge quantity of the ith electric automobile at the frequency modulation starting time t is represented; dmaxRepresents the maximum allowed depth of discharge, kWh;
the maximum charge-discharge power of the electric automobile during the frequency modulation period is shown as the formula (10):
in the formula (I), the compound is shown in the specification,
the difference value of the initial electric quantity of the electric automobile and the minimum electric quantity allowed by the end of frequency modulation is obtained; when in use
And the real-time adjustable capacity of the electric automobile is as follows:
in the formula (I), the compound is shown in the specification,
representing the adjustable capacity, kW, of the ith electric vehicle;
the up-regulation capacity, kW, which can be provided by the cluster electric automobile is represented; n represents the number of electric vehicles.
8. The method according to claim 6, wherein the method for controlling the frequency emergency in the islanding operation mode comprises the following steps: method for determining the down-regulated capacity:
if the current grid-connected power of the electric automobile is smaller than the maximum charging power and the electric quantity is not full, the frequency is adjusted downwards, and the maximum charging power allowed by the electric automobile is adjusted
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
representing the difference value between the electric quantity of the electric automobile before frequency modulation and the maximum electric quantity; when in use
And the time, the electric automobile has a space for downwards frequency modulation, namely the capacity of the electric automobile can be adjusted downwards in real time as follows:
in the formula (I), the compound is shown in the specification,
indicating the down-regulation capacity, kW, which can be provided by the ith electric vehicle;
indicating the turndown capacity, kW, that the cluster electric vehicle can provide.
9. The method according to claim 1, wherein the method for controlling the frequency emergency in the islanding operation mode comprises the following steps: calculating the required adjustment amount:
in the formula: kdroop1And Kdroop2Respectively representing the droop coefficients of the frequency during the frequency up-regulation and the frequency down-regulation, namely Hz/kW; p1And P2Respectively representing the actual regulating quantity, kW, of the control target; and Δ f represents the deviation of the actual frequency from the nominal frequency, Hz.
Priority Applications (1)
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|---|---|---|---|---|
| CN113675895A (en) * | 2021-08-06 | 2021-11-19 | 阳光电源（上海）有限公司 | Power distribution method and system for optical storage multi-machine parallel system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054769A (en) * | 2017-12-21 | 2018-05-18 | 大连理工大学 | A kind of battery energy storage system control strategy towards primary frequency regulation of power network |
-
2021
- 2021-03-30 CN CN202110343543.3A patent/CN113067349A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054769A (en) * | 2017-12-21 | 2018-05-18 | 大连理工大学 | A kind of battery energy storage system control strategy towards primary frequency regulation of power network |
Non-Patent Citations (3)
| Title |
|---|
| 于娜等: "计及用户参与度的温控负荷一次调频控制策略", 《中国科技论文》 * |
| 张聪等: "电动汽车实时可调度容量评估方法研究", 《电力系统保护与控制》 * |
| 鞠平等: "基于电池储能和可控负荷的孤岛型海岛微电网频率协调控制策略", 《河海大学学报（自然科学版）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675895A (en) * | 2021-08-06 | 2021-11-19 | 阳光电源（上海）有限公司 | Power distribution method and system for optical storage multi-machine parallel system |
| CN113675895B (en) * | 2021-08-06 | 2024-04-12 | 阳光电源（上海）有限公司 | Power distribution method and system for optical storage multi-machine parallel system |
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