CN115207951A - Energy storage system control method considering wind curtailment of wind power plant and prediction error assessment - Google Patents

Energy storage system control method considering wind curtailment of wind power plant and prediction error assessment Download PDF

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CN115207951A
CN115207951A CN202110576452.4A CN202110576452A CN115207951A CN 115207951 A CN115207951 A CN 115207951A CN 202110576452 A CN202110576452 A CN 202110576452A CN 115207951 A CN115207951 A CN 115207951A
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power
energy storage
charging
storage system
wind
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卢迪
陈晓锋
赵岩
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PowerChina Huadong Engineering Corp Ltd
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PowerChina Huadong Engineering Corp 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
    • H02J3/28—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
    • 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
    • H02J3/381—Dispersed generators
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • 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
    • 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
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses an energy storage system control method considering wind curtailment of a wind power plant and prediction error assessment. The wind power plant abandoned wind and prediction error indexes are considered, the operation strategy control of the wind power plant energy storage system is researched, the wind power plant prediction system error can be effectively reduced, and the wind power plant abandoned wind electric quantity is reduced. The method comprises the following steps: acquiring the actual output power of the wind power plant, a power instruction given by a power grid to the wind power plant and the predicted power of a wind power prediction system in a second level; carrying out accounting on short-term prediction and ultra-short-term prediction errors of the wind power plant; collecting and judging operating parameters of the energy storage system; and controlling charging and discharging of the energy storage system according to the running state of the energy storage system.

Description

Energy storage system control method considering wind curtailment of wind power plant and prediction error assessment
Technical Field
The invention relates to the field of combined development of a wind power plant and an electrochemical energy storage system for new energy power generation, in particular to an energy storage system control method for wind power plant wind curtailment and prediction error assessment.
Background
The output power of the wind power plant has volatility and intermittency, the difficulty of making a power generation plan is greatly increased due to large-scale access of wind power, and the wind power brings huge challenges to the dispatching and operation of a power system. The energy storage system with a certain capacity is configured for the wind power plant, and the method is one of effective means for relieving peak load and frequency modulation pressure of a power system and improving wind power receiving capacity. The wind power plant development enterprise can also utilize the energy storage system to perform charging and discharging operations, wind power plant abandoned wind is reduced, meanwhile, the condition of large prediction error is reported by the wind power plant wind power prediction system, the charging and discharging of the energy storage system are controlled according to the power grid check standard, the check of the power grid on the wind power plant is reduced, and the operation benefit of the wind power plant is improved.
Disclosure of Invention
The invention aims to provide an energy storage system control method considering wind power plant wind curtailment and prediction error assessment. The control strategy takes the tracking compensation wind power plan deviation as a control target to realize accurate compensation, so that the adjusted control deviation can meet the grid-connected operation check requirement of the conventional unit as much as possible, and the energy storage system is used for absorbing electric quantity in the wind power station wind abandoning period to reduce the wind power station wind abandoning. Meanwhile, the discharging depth of the energy storage system is controlled, and the economical efficiency of the energy storage system is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
an energy storage system control method considering wind curtailment of a wind power plant and prediction error assessment comprises the following steps:
acquiring the actual output power of the wind power plant, a power instruction given by a power grid to the wind power plant and the predicted power of a wind power prediction system in a second level;
carrying out accounting on short-term prediction and ultra-short-term prediction errors of the wind power plant;
collecting and judging operating parameters of the energy storage system;
and controlling charging and discharging of the energy storage system according to the running state of the energy storage system.
Preferably, the energy storage system control strategy considering wind curtailment of the wind power plant and prediction error assessment further comprises:
and (3) total pressure over-voltage and under-voltage power limitation judgment:
1) The total voltage and overvoltage alarm is carried out, the battery management system limits the charging power to 0, and the discharging is not limited;
2) The total voltage and the undervoltage are alarmed, the battery management system limits the discharge power to 0, and the charging is not limited;
and (3) judging the limitation of the over-voltage and under-voltage power of the single voltage:
1) The single body is alarmed in an overvoltage mode, the charging power is limited to 0 by the energy storage converter, and discharging is not limited;
2) The single body is subjected to under-voltage alarm, the energy storage converter limits the discharge power to 0, and the charging is not limited;
judging over-under-temperature power limitation:
1) Triggering an over-temperature alarm by the temperature of the single body, and limiting the charge and discharge power to 0 by the battery management system;
2) Triggering an undertemperature alarm by the temperature of the single body, and limiting the charge and discharge power to be 0 by the battery management system;
and (3) overcurrent power limitation judgment:
1) In the charging process, the charging current reaches a protection value, and the battery management system limits the charging power and the discharging power to be 0;
2) In the discharging process, the discharging current reaches a protection value, the battery management system limits the charging and discharging power to be 0, and the state is recovered after being released;
and (3) judging the power limitation of the offline of the battery management system:
when the communication between the battery management system and the energy storage converter is abnormal, the charging and discharging power is limited to be 0;
and (3) judging the power limit of the short-circuit fault:
when the battery has short-circuit fault, the battery management system limits the charging and discharging power to be 0;
and (3) judging the power limitation when the total pressure and the undervoltage monomer are over-voltage:
1) Total voltage under-voltage alarm and monomer over-voltage alarm, the battery management system limits the charging and discharging power to 0;
2) When the single overvoltage alarm is released and the total voltage and undervoltage alarm is not released, releasing the charging limiting power;
3) After the total voltage and under-voltage alarm is released, releasing the charging and discharging power;
and (3) removing protection state word power limitation judgment after protection tripping:
when the energy storage converter discharges the battery stack, a single under-voltage alarm and under-voltage protection are generated to enable the battery cluster to trip, the discharging power is limited to 0, and the charging is not limited.
Preferably, the control of charging and discharging the energy storage system according to the running state of the energy storage system comprises the following steps:
electricity limiting:
Figure BDA0003084556710000021
the power grid dispatching issuing active power is small, the actual wind power plant power is large, the power is limited, the battery is charged, and the deviation is reduced;
electricity is not limited:
Figure BDA0003084556710000031
1) When in use
Figure BDA0003084556710000032
The predicted value is 0, the actual wind power plant has high power, and the battery is charged to reduce deviation;
2) When in use
Figure BDA0003084556710000033
The predicted value is larger, the actual power of the wind power plant is 0, and the battery discharges to reduce deviation;
3) When the temperature is higher than the set temperature
Figure BDA0003084556710000034
And is provided with
Figure BDA0003084556710000035
And is
Figure BDA0003084556710000036
Figure BDA0003084556710000037
The predicted value is small, the power of the wind power plant is high, and the battery is charged to reduce deviation;
Figure BDA0003084556710000038
the predicted value is large, the power of the wind power plant is small, the battery discharges, and the deviation is reduced;
4) When in use
Figure BDA0003084556710000039
And is
Figure BDA00030845567100000310
And is
Figure BDA00030845567100000311
Short-term prediction is not examined, and only ultra-short-term prediction examination is considered
Figure BDA00030845567100000312
The ultra-short-term prediction value is smaller, the wind power is high, the battery is charged, and the ultra-short-term prediction deviation is reduced;
Figure BDA00030845567100000313
the ultra-short-term prediction value is large, the wind power is low, the battery discharges, and the ultra-short-term prediction deviation is reduced.
Preferably, the electricity is limited
Figure BDA00030845567100000314
The specific energy storage system charge-discharge control method under the condition comprises the following steps:
when in use
Figure BDA00030845567100000315
For those S oc,j ＜S oc,high Is charged with a charging power of p batt,cj If charging is more than or equal to S oc,high The charging is stopped. For those S oc,j ≥S oc,high The cell stack of (1) does not operate;
preferably, the electricity is not limited
Figure BDA00030845567100000316
The specific energy storage system charge-discharge control method under the condition comprises the following steps:
when in use
Figure BDA00030845567100000317
1)
Figure BDA00030845567100000318
No examination is performed; the energy storage system does not act.
2)
Figure BDA00030845567100000319
For those S oc,j ＜S oc,high Is charged at a charging power of
Figure BDA00030845567100000320
Figure BDA00030845567100000321
If the charging is more than or equal to S oc,high The charging is stopped. For those S oc,j ≥S oc,high The cell stack of (1) does not operate;
when in use
Figure BDA00030845567100000322
1)
Figure BDA00030845567100000323
No examination is performed; the energy storage system is not operating.
2) When in use
Figure BDA00030845567100000324
For those S oc,j ＞S oc,low Is discharged at a discharge power of
Figure BDA00030845567100000325
Figure BDA00030845567100000326
If discharging to less than or equal to S oc,low The discharge is stopped. For those S oc,j ≤S oc,low The cell stack of (1) does not operate;
when in use
Figure BDA00030845567100000327
And is provided with
Figure BDA00030845567100000328
And is provided with
Figure BDA00030845567100000329
1)
Figure BDA0003084556710000041
At this time, if
Figure BDA0003084556710000042
For those S oc,j ＜S oc,high Is charged at a charging power of
Figure BDA0003084556710000043
If the charging is more than or equal to S oc,high The charging is stopped. For those S oc,j ≥S oc,high The cell stack of (1) does not operate;
2)
Figure BDA0003084556710000044
at this time, if
Figure BDA0003084556710000045
For those S oc,j ＞S oc,low Is discharged at a discharge power of
Figure BDA0003084556710000046
If discharging to less than or equal to S oc,low The discharge is stopped. For those S oc,j ≤S oc,low The cell stack of (1) does not operate;
when in use
Figure BDA0003084556710000047
And is provided with
Figure BDA0003084556710000048
And is
Figure BDA0003084556710000049
(1 judgment every 30 seconds)
1)
Figure BDA00030845567100000410
If it is not
Figure BDA00030845567100000411
For those S oc,j ＜S oc,high Is charged at a charging power of
Figure BDA00030845567100000412
If the charging is more than or equal to S oc,high The charging is stopped. For those S oc,j ＞S oc,high The cell stack of (1) does not operate;
2)
Figure BDA00030845567100000413
if it is not
Figure BDA00030845567100000414
For those S oc,j ＞S oc,low Is discharged at a discharge power of
Figure BDA00030845567100000415
If discharging to less than or equal to S oc,low The discharge is stopped. For those S oc,j ≤S oc,low The cell stack of (1) does not operate;
preferably, the configuration interface is reserved in the energy storage system control strategy, and the SOC region can be modified. Setting the SOC (State of Charge) range of the energy storage system between 10% and 90% for the first time, and using S OC,high And S OC,low Overcharge indicating energy storage SOCAnd an overdischarged horizontal limit. .
In order to solve the problems of wind power plant wind abandonment and wind power prediction system assessment by a power grid, wind power plant wind abandonment is reduced, a larger prediction error is reported by a wind power prediction system of the wind power plant, and assessment of the power grid on the wind power plant is reduced.
Drawings
FIG. 1 is a schematic flow chart of an energy storage system control method considering wind curtailment of a wind power plant and prediction error assessment provided by the invention;
FIG. 2 is a schematic composition diagram of a wind power storage system in the control method of the energy storage system considering wind curtailment of the wind power plant and prediction error assessment provided by the invention;
FIG. 3 is a schematic diagram of a data acquisition system of the wind power storage system in the control method of the energy storage system considering wind curtailment of the wind power plant and prediction error assessment.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
The invention provides an energy storage system control method considering wind curtailment of a wind power plant and prediction error assessment, which comprises the following steps of:
acquiring the actual output power of the wind power plant, a power instruction given by a power grid to the wind power plant and the predicted power of a wind power prediction system in a second level;
carrying out accounting on short-term prediction and ultra-short-term prediction errors of the wind power plant;
collecting and judging the operating parameters of the energy storage system;
and controlling charging and discharging of the energy storage system according to the running state of the energy storage system.
The specific implementation steps are as follows:
1) Short-term prediction and ultra-short-term prediction error assessment model for wind power plant
Referring to fig. 2, in this embodiment, the present invention provides a typical wind storage system structure, where the wind storage system includes a wind power generator, a wind power inverter, an energy storage lithium iron phosphate battery stack, an energy storage converter, a transformer, and other devices, the devices are connected in a common connection, after the wind power generator is connected to the inverter, the wind power generator converges and boosts the grid, the energy storage battery stack is connected to the energy storage converter, and then the wind power generator is boosted by the transformer and is connected to a bus of a wind farm. For the wind power storage system, a short-term prediction and ultra-short-term prediction error assessment model of the wind power plant is constructed.
Short-term prediction error and assessment:
the wind power plant is required to report a short-term power prediction curve to a power dispatching organization on time, the maximum error of a daily prediction curve provided by the wind power plant is not more than 25%, and if the maximum error of the daily prediction curve does not reach the standard, the daily prediction curve is examined according to the deviation integral electric quantity of 1 minute/ten thousand kilowatt hours.
The maximum error value calculation formula of the daily prediction curve is as follows:
Figure BDA0003084556710000061
wherein:
i is the number of points, 96 points in 1 day;
Figure BDA0003084556710000062
is the ith point available power predicted value;
Figure BDA0003084556710000063
is the ith point actual power (actual wind farm total output power).
When in use
Figure BDA0003084556710000064
Is zero, when
Figure BDA0003084556710000065
If the installed capacity is within 3 percent, the test is not performed; when in use
Figure BDA0003084556710000066
The error value is calculated as 100% when 3% of the installed capacity is exceeded.
When in use
Figure BDA0003084556710000067
Is zero, when
Figure BDA0003084556710000068
If the installed capacity is within 3 percent, the test is not performed; when in use
Figure BDA0003084556710000069
When the installed capacity is exceeded by 3%, the error value is calculated as 100%.
Ultra-short term prediction error and assessment:
the wind power plant shall report the ultra-short term power prediction curve to the power dispatching organization on time, the 2 nd hour harmonic mean accuracy of the ultra-short term prediction curve of the wind power plant is not less than 80%, and if the ultra-short term prediction curve does not reach the standard, the wind power plant is examined by the installed capacity of the whole plant multiplied by 0.5 min/ten thousand watts when the reduction is 1%.
2) Second-level acquisition is carried out on actual output power of the wind power plant, power given out by a power grid to the wind power plant and predicted power of a wind power prediction system
Referring to fig. 3, in this embodiment, the present invention provides a data acquisition system structure of a typical wind storage system, where the system includes devices such as a wind power battery energy management system, a wind power prediction system, a data acquisition industrial personal computer, and an energy storage energy management system, the devices are connected in a common connection, a wind turbine is connected to an inverter, then the wind turbine converges and boosts the voltage, and is connected to an energy storage converter, and then the wind turbine is boosted by a transformer and then is connected to a wind farm bus, and the data acquisition system is used to acquire actual output power of the wind farm, power delivered by a power grid to the wind farm, and predicted power of the wind power prediction system.
3) Accounting is carried out on short-term prediction error and ultra-short-term prediction error of wind power plant
And after the actual output power of the wind power plant, the power given by the wind power plant by the power grid and the predicted power of the wind power prediction system are collected in seconds, error calculation is carried out by using a short-term prediction error and ultra-short-term prediction error calculation model of the wind power plant, and corresponding error data are obtained.
4) Collecting and judging operating parameters of energy storage system
The method comprises the following steps of collecting operating parameters of the energy storage system by using a data collection industrial personal computer and an energy storage energy management system, and judging according to the collected operating state of energy storage system equipment, wherein the main judgment method comprises the following steps:
and (3) total pressure over-voltage and under-voltage power limitation judgment:
total voltage and overvoltage alarm, the battery management system limits the charging power to 0, and the discharging is not limited;
total voltage and undervoltage alarm, the battery management system limits the discharge power to 0, and the charging is not limited;
and (3) judging the limitation of the over-voltage and under-voltage power of the single voltage:
a single body overvoltage alarm is given, the charging power is limited to 0 by the energy storage converter, and the discharging is not limited;
the single body is under-voltage alarmed, the energy storage converter limits the discharge power to 0, and the charging is not limited;
judging over-under-temperature power limitation:
triggering an over-temperature alarm by the temperature of the single body, and limiting the charge and discharge power to 0 by the battery management system;
triggering an under-temperature alarm by the monomer temperature, and limiting the charge and discharge power to 0 by the battery management system;
and (3) overcurrent power limitation judgment:
during charging, the charging current reaches a protection value, and the battery management system will limit both the charging and discharging power to 0;
in the discharging process, the discharging current reaches a protection value, the battery management system limits the charging and discharging power to be 0, and the state is recovered after being released;
and (3) judging the power limitation of the offline of the battery management system:
when the communication between the battery management system and the energy storage converter is abnormal, the charging and discharging power is limited to be 0;
and (3) judging the power limit of the short-circuit fault:
when the battery has a short-circuit fault, the battery management system limits the charging power and the discharging power to be 0;
and (3) judging the power limitation when the total pressure and the undervoltage monomer are over-voltage:
total voltage under-voltage alarm and single body over-voltage alarm, the battery management system limits the charge and discharge power to 0;
when the single overvoltage alarm is released and the total voltage and undervoltage alarm is not released, releasing the charging limiting power;
after the total voltage and undervoltage alarm is released, releasing the charging and discharging power;
and (3) removing the protection state word power limitation judgment after protection tripping:
when the energy storage converter discharges the battery stack, a single under-voltage alarm and under-voltage protection are generated to enable the battery cluster to trip, the discharging power is limited to 0, and the charging is not limited.
5) Controlling charging and discharging of the energy storage system according to the running state of the energy storage system
The method for controlling the charging and discharging of the energy storage system according to the running state of the energy storage system comprises the following steps:
determining a dead zone and a normal regulation zone:
when the deviation of the output power and the predicted power of the wind power plant is in the dead zone range | P E |≤P E,D The control command is not issued, and the energy storage system is not adjusted;
and outside the dead zone range, the normal regulation zone is formed. In the normal operating area, different energy storage systems (for example, in fig. 2, a #1 cell stack, a #2 cell stack and a corresponding energy storage converter) are controlled to charge and discharge according to the following different states:
and (3) a power limiting state:
Figure BDA0003084556710000081
if S OC,1 ＜0.9、S OC,2 If < 0.9, charging the #1 cell stack, charging the #2 cell stack, and charging the #1 cell stack with power p batt,c1 #2 Stack charging Power p batt,c2 (ii) a If #1 stack is charged to S OC,1 Stopping charging when the charging voltage is more than or equal to 0.9; #2 cell Stack S OC,2 Stopping charging when the charging voltage is more than or equal to 0.9;
if S OC,1 < 0.9 and S OC,2 Not less than 0.9, the #1 cell stack is charged, and the #1 cellStack charging power p batt,c1 (ii) a If #1 stack is charged to S OC,1 Stopping charging when the charging voltage is more than or equal to 0.9; #2 stack not active;
if S OC,1 Not less than 0.9 and S OC,2 If < 0.9, the #2 cell stack is charged, and the #2 cell stack charging power p batt,c2 (ii) a If #2 stack is charged to S OC,1 Stopping charging when the charging voltage is more than or equal to 0.9; the #1 cell stack does not operate;
the unlimited electric state:
Figure BDA0003084556710000082
when
Figure BDA0003084556710000083
The predicted value is 0, the actual wind field power is high, the battery is charged, and the deviation is reduced;
1)
Figure BDA0003084556710000084
(example P) un-assess 298MW (installed power of wind farm) = 8.94MW), and is not examined; the energy storage system is not operating.
2)
Figure BDA0003084556710000085
If S OC,1 < 0.9 and S OC,2 If the voltage is less than 0.9, charging the #1 cell stack and charging the #2 cell stack; #1 Stack Charge Power
Figure BDA0003084556710000086
#2 Stack Charge Power
Figure BDA0003084556710000087
The #2 cell stack does not operate.
3)
Figure BDA0003084556710000088
If S OC,1 < 0.9 and S OC,2 If the number of the batteries is more than or equal to 0.9, the #1 battery stack is charged; #1 Stack Charge Power draw
Figure BDA0003084556710000089
4)
Figure BDA0003084556710000091
If S OC,1 Not less than 0.9 and S OC,2 If the current value is less than 0.9, the #2 battery stack is charged; #2 Stack Charge Power draw
Figure BDA0003084556710000092
The #1 cell stack does not operate.
When
Figure BDA0003084556710000093
The predicted value is larger, the actual wind field power is 0, and the battery discharges to reduce the deviation;
1)
Figure BDA0003084556710000094
no examination is performed; the energy storage system is not operating.
2) When in use
Figure BDA0003084556710000095
If S OC,1 > 0.1 and S OC,2 If the voltage is more than 0.1, discharging the #1 cell stack and charging the #2 cell stack; #1 Battery Stacking electric Power
Figure BDA0003084556710000096
#2 Battery Stacking electric Power draw
Figure BDA0003084556710000097
3) When in use
Figure BDA0003084556710000098
If S OC,1 > 0.1 and S OC,2 Discharging the #1 cell stack at less than or equal to 0.1; #1 Battery Stacking electric Power draw
Figure BDA0003084556710000099
Figure BDA00030845567100000910
The #2 cell stack does not operate.
4) When in use
Figure BDA00030845567100000911
If S OC,1 Less than or equal to 0.1 and S OC,2 Discharge of > 0.1, #2 cell stack; #2 Battery Stacking electric Power draw
Figure BDA00030845567100000912
Figure BDA00030845567100000913
The #1 cell stack does not operate.
When
Figure BDA00030845567100000914
And is
Figure BDA00030845567100000915
And is
Figure BDA00030845567100000916
Figure BDA00030845567100000917
The predicted value is smaller, the power is large, the battery is charged, and the deviation is reduced;
1) If S is OC,1 < 0.9 and S OC,2 Is less than 0.9, in this case if
Figure BDA00030845567100000918
Charging the #1 cell stack and charging the #2 cell stack; #1 Stack Charge Power value
Figure BDA00030845567100000919
#2 Stack Charge Power value
Figure BDA00030845567100000920
2) If S is OC,1 < 0.9 and S OC,2 Not less than 0.9, in this case if
Figure BDA00030845567100000921
Then the #1 stack is charged; #1 Stack Charge Power value
Figure BDA00030845567100000922
The #2 cell stack does not operate.
3) If S is OC,1 Not less than 0.9 and S OC,2 < 0.9, in this case if
Figure BDA00030845567100000923
Then #2 stack is charged; #2 Stack Charge Power value
Figure BDA00030845567100000924
The #1 cell stack does not operate.
Figure BDA00030845567100000925
The predicted value is large, the wind power is low, the battery discharges, and the deviation is reduced;
1) If S is OC,1 > 0.1 and S OC,2 > 0.1, in this case if
Figure BDA00030845567100000926
Discharging the stack #1 and the stack # 2; #1 Battery Stacking electric Power
Figure BDA0003084556710000101
#2 Battery Stacking electric Power
Figure BDA0003084556710000102
Figure BDA0003084556710000103
2) If S is OC,1 > 0.1 and S OC,2 Is less than or equal to 0.1, in this case if
Figure BDA0003084556710000104
The #1 stack is discharged; #1 Stack Charge Power draw
Figure BDA0003084556710000105
The #2 cell stack does not operate.
3) If S is OC,1 Less than or equal to 0.1 and S OC,2 Greater than 0.1, in this case if
Figure BDA0003084556710000106
The #2 stack is discharged; #2 Stack Charge Power draw
Figure BDA0003084556710000107
The #1 cell stack does not operate.
When
Figure BDA0003084556710000108
And is provided with
Figure BDA0003084556710000109
And is
Figure BDA00030845567100001010
Short-term prediction is not checked, and only ultra-short-term prediction checking is considered
Figure BDA00030845567100001011
The ultra-short-term prediction value is smaller, the wind power is high, the battery is charged, and the ultra-short-term prediction deviation is reduced;
1) If it is not
Figure BDA00030845567100001012
If S OC,1 < 0.9 and S OC,2 If the voltage is less than 0.9, charging the #1 cell stack and charging the #2 cell stack; #1 Stack Charge Power
Figure BDA00030845567100001013
#2 Stack Charge Power
Figure BDA00030845567100001014
2) If it is not
Figure BDA00030845567100001015
If S OC,1 < 0.9 and S OC,2 More than or equal to 0.9, charging the #1 battery stack; #1 Stack Charge Power draw
Figure BDA00030845567100001016
The #2 cell stack does not operate.
3) If it is not
Figure BDA00030845567100001017
If S OC,1 Not less than 0.9 and S OC,2 If the voltage is less than 0.9, the #2 cell stack is charged; #2 Stack Charge Power draw
Figure BDA00030845567100001018
The #1 cell stack does not operate.
Figure BDA00030845567100001019
The ultra-short-term prediction value is large, the wind power is low, the battery discharges, and the ultra-short-term prediction deviation is reduced;
1) If it is not
Figure BDA00030845567100001020
If S OC,1 > 0.1 and S OC,2 If the discharge voltage is more than 0.1, discharging the stack #1 and discharging the stack # 2; #1 Battery Stacking electric Power
Figure BDA00030845567100001021
#2 Battery Stacking electric Power
Figure BDA00030845567100001022
Figure BDA00030845567100001023
2) If it is not
Figure BDA00030845567100001024
If S OC,1 > 0.1 and S OC,2 Discharging the #1 cell stack when the discharge rate is less than or equal to 0.1; #1 Battery Stacking electric Power draw
Figure BDA00030845567100001025
The #2 cell stack does not operate.
3) If it is not
Figure BDA0003084556710000111
If S OC,1 Less than or equal to 0.1 and S OC,2 If the voltage is more than 0.1, discharging the #2 cell stack; #2 Battery Stacking electric Power draw
Figure BDA0003084556710000112
The #1 cell stack does not operate.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (6)

1. An energy storage system control method considering wind curtailment of a wind power plant and prediction error assessment is characterized by comprising the following steps of:
acquiring actual output power of the wind power plant, a power instruction issued by the power grid to the wind power plant and predicted power of a wind power prediction system;
carrying out accounting on short-term prediction and ultra-short-term prediction errors of the wind power plant;
collecting and judging operating parameters of the energy storage system;
and controlling charging and discharging of the energy storage system according to the running state of the energy storage system.
2. The energy storage system control strategy considering wind curtailment of a wind farm and prediction error assessment according to claim 1, wherein the acquisition and judgment of the operating parameters of the energy storage system comprises the steps of:
(1) And (3) total pressure over-voltage and under-voltage power limitation judgment:
1) The total voltage and overvoltage alarm is carried out, the battery management system limits the charging power to 0, and the discharging is not limited;
2) The total voltage and under-voltage alarm is carried out, the battery management system limits the discharge power to 0, and the charging is not limited;
(2) And (3) judging the limitation of the over-voltage and under-voltage power of the single voltage:
1) The single body is subjected to overvoltage alarm, the charging power is limited to 0 by the energy storage converter, and the discharging is not limited;
2) The single body is subjected to under-voltage alarm, the energy storage converter limits the discharge power to 0, and the charging is not limited;
(3) Judging over-temperature and under-temperature power limitation:
1) Triggering an over-temperature alarm by the temperature of the single body, and limiting the charge and discharge power to 0 by the battery management system;
2) Triggering an undertemperature alarm by the temperature of the single body, and limiting the charge and discharge power to be 0 by the battery management system;
(4) And (3) overcurrent power limitation judgment:
1) In the charging process, the charging current reaches a protection value, and the battery management system limits the charging power and the discharging power to be 0;
2) In the discharging process, the discharging current reaches a protection value, the battery management system limits the charging and discharging power to be 0, and the state is recovered after being released;
(5) And (3) judging the power limitation of the offline of the battery management system:
when the communication between the battery management system and the energy storage converter is abnormal, the charging and discharging power is limited to be 0;
(6) And (3) judging the power limit of the short-circuit fault:
when the battery has short-circuit fault, the battery management system limits the charging and discharging power to be 0;
(7) And (3) judging the power limitation when the total pressure and the undervoltage monomer are over-voltage:
1) Total voltage under-voltage alarm and monomer over-voltage alarm, the battery management system limits the charging and discharging power to 0;
2) When the single overvoltage alarm is released and the total voltage and undervoltage alarm is not released, releasing the charging limiting power;
3) After the total voltage under-voltage alarm is released, releasing the charging and discharging power;
(8) And (3) removing protection state word power limitation judgment after protection tripping:
when the energy storage converter discharges the battery stack, a single under-voltage alarm and under-voltage protection are generated to enable the battery cluster to trip, the discharging power is limited to 0, and the charging is not limited.
3. The energy storage system control method considering wind curtailment of wind power plant and prediction error assessment according to claim 1, wherein the control of charging and discharging the energy storage system according to the running state of the energy storage system comprises the steps of:
(1) Determining a dead zone and a normal regulation zone:
when the deviation of the output power and the predicted power of the wind power plant is in the dead zone range | P E |≤P E,D The control command is not issued, and the energy storage system is not adjusted;
and outside the dead zone range, the dead zone range is a normal regulation zone, and in a normal working zone, different energy storage system charge and discharge control methods are carried out according to the following different states:
(2) Electricity limiting:
Figure FDA0003084556700000021
the active power generated by the power grid in dispatching is small, the actual wind power plant is high in power, the power is limited, the battery is charged, and the deviation is reduced;
(3) Electricity is not limited:
Figure FDA0003084556700000022
1) When in use
Figure FDA0003084556700000023
The predicted value is 0, the actual wind power plant has high power, and the battery is charged to reduce deviation;
2)
Figure FDA0003084556700000024
the predicted value is larger, the actual power of the wind power plant is 0, and the battery discharges to reduce deviation;
3)
Figure FDA0003084556700000025
and is
Figure FDA0003084556700000026
And is
Figure FDA0003084556700000027
Figure FDA0003084556700000028
The predicted value is small, the power of the wind power plant is high, and the battery is charged to reduce deviation;
Figure FDA0003084556700000029
the predicted value is large, the power of the wind power plant is small, the battery discharges, and the deviation is reduced;
4)
Figure FDA00030845567000000210
and is provided with
Figure FDA00030845567000000211
And is
Figure FDA00030845567000000212
Short-term prediction is not examined, and only ultra-short-term prediction examination is considered
Figure FDA00030845567000000213
The ultra-short-term prediction value is smaller, the power of the wind power plant is high, and the battery is charged, so that the ultra-short-term prediction deviation is reduced;
Figure FDA0003084556700000031
the ultra-short-term prediction value is large, the power of the wind power plant is low, the battery discharges, and the ultra-short-term prediction deviation is reduced;
wherein, P E Is the deviation of the wind farm output power from the predicted power; p ess,rated The installed rated power of the energy storage system of the wind power plant; p is E,D Is 0.3 percent of rated power of the energy storage system, namely 0.003 multiplied by P ess,rated ；
Figure FDA0003084556700000032
Dispatching and issuing an active target value by the power grid at the ith point;
Figure FDA0003084556700000033
is the output power of the wind farm at point i;
Figure FDA0003084556700000034
is the ith point short-term prediction available power value;
Figure FDA0003084556700000035
is the actual total output power at point i;
Figure FDA0003084556700000036
is the ith point ultra-short term prediction available power value; the unit of power is MW.
4. The energy storage system control method considering wind curtailment of wind power plant and prediction error assessment according to claim 3, wherein the power limiting is as follows:
Figure FDA0003084556700000037
the specific energy storage system charge-discharge control method under the condition comprises the following steps:
when in use
Figure FDA0003084556700000038
For those S oc,j ＜S oc,high Is charged with a charging power of p batt,cj If charging to more than or equal to S oc,high The charging is stopped. For those S oc,j ≥S oc,high The cell stack of (1) does not operate;
wherein S is oc,j Is the state of charge (SOC) of the jth cell stack; p is a radical of formula batt,cj Is the jth stack maximum allowed charging power.
5. The energy storage system control method considering wind curtailment of wind power plant and prediction error assessment according to claim 3, wherein the unlimited power:
Figure FDA0003084556700000039
the specific energy storage system charge-discharge control method under the condition comprises the following steps:
5.1 when
Figure FDA00030845567000000310
1)
Figure FDA00030845567000000311
No examination is performed; the energy storage system does not act;
2)
Figure FDA00030845567000000312
for those S oc,j ＜S oc,high Is charged at a charging power of
Figure FDA00030845567000000313
Figure FDA00030845567000000314
If the charging is more than or equal to S oc,high Stopping charging; for those S oc,j ≥S oc,high The cell stack of (1) does not operate;
wherein, P un-assess The power value is 3% of the installed capacity of the wind power plant, and is less than the power value and is not examined;
Figure FDA00030845567000000315
is the number of rechargeable battery stacks of the current energy storage system;
5.2 when
Figure FDA00030845567000000316
1)
Figure FDA00030845567000000317
No examination is performed; the energy storage system is not in operation;
2) When in use
Figure FDA00030845567000000318
For those S oc,j ＞S oc,low Is discharged at a discharge power of
Figure FDA00030845567000000319
p batt,fj ) If discharging to less than or equal to S oc,low The discharge is stopped. For those S oc,j ≤S oc,low The cell stack of (1) does not operate;
wherein p is batt,fj Is the jth stack maximum allowed discharge power;
Figure FDA0003084556700000041
is the number of the current energy storage system dischargeable cell stacks;
5.3 when
Figure FDA0003084556700000042
And is
Figure FDA0003084556700000043
And is
Figure FDA0003084556700000044
5.3.1
Figure FDA0003084556700000045
At this time, if
Figure FDA0003084556700000046
For those S oc,j ＜S oc,high Is charged at a charging power of
Figure FDA0003084556700000047
If the charging is more than or equal to S oc,high The charging is stopped. For those S oc,j ≥S oc,high The cell stack of (1) does not operate;
5.3.2
Figure FDA0003084556700000048
at this time, if
Figure FDA0003084556700000049
For those S oc,j ＞S oc,low Is discharged at a discharge power of
Figure FDA00030845567000000410
If discharging to less than or equal to S oc,low The discharge is stopped. For those S oc,j ≤S oc,low The cell stack of (1) does not operate;
5.4 when
Figure FDA00030845567000000411
And is
Figure FDA00030845567000000412
And is
Figure FDA00030845567000000413
(1 judgment every 30 seconds)
5.4.1
Figure FDA00030845567000000414
If it is not
Figure FDA00030845567000000415
For those S oc,j ＜S oc,high Is charged at a charging power of
Figure FDA00030845567000000416
If the charging is more than or equal to S oc,high The charging is stopped. For those S oc,j ＞S oc,high The cell stack of (1) does not operate;
5.4.2
Figure FDA00030845567000000417
if it is not
Figure FDA00030845567000000418
For those S oc,j ＞S oc,low Is discharged at a discharge power of
Figure FDA00030845567000000419
If discharging to less than or equal to S oc,low The discharge is stopped. For those S oc,j ≤S oc,low The cell stack of (1) does not operate.
6. The energy storage system control method considering wind curtailment of the wind power plant and prediction error assessment according to claim 4 or 5, characterized in that a configuration interface is reserved in an energy storage system control strategy, and an SOC region can be modified; setting the State of Charge (SOC) range of the energy storage system between 10% and 90% for the first time, and using S OC,high And S OC,low Indicating the level limits of overcharge and overdischarge of the energy storage SOC.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115954909A (en) * 2023-03-01 2023-04-11 合肥华思系统有限公司 Power prediction deviation compensation method and system for new energy power station

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115954909A (en) * 2023-03-01 2023-04-11 合肥华思系统有限公司 Power prediction deviation compensation method and system for new energy power station

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