CN114513015A - Power instruction strategy for energy storage auxiliary frequency modulation generator set considering energy storage requirement - Google Patents
Power instruction strategy for energy storage auxiliary frequency modulation generator set considering energy storage requirement Download PDFInfo
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- CN114513015A CN114513015A CN202210251436.2A CN202210251436A CN114513015A CN 114513015 A CN114513015 A CN 114513015A CN 202210251436 A CN202210251436 A CN 202210251436A CN 114513015 A CN114513015 A CN 114513015A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 88
- 238000007599 discharging Methods 0.000 claims abstract description 35
- 230000009471 action Effects 0.000 claims description 20
- 230000008859 change Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000002776 aggregation Effects 0.000 claims description 2
- 238000004220 aggregation Methods 0.000 claims description 2
- 238000012983 electrochemical energy storage Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000009825 accumulation Methods 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000011217 control strategy Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
In the control strategy of the conventional energy storage auxiliary frequency modulation, a generator set takes a power grid dispatching AGC instruction as a power target value, the invention provides a power instruction strategy of an energy storage auxiliary frequency modulation generator set which gives consideration to energy storage requirements, and the effects of maintaining proper stored electric quantity and not reducing the auxiliary frequency modulation performance are realized by timely charging and discharging energy storage equipment.
Description
Technical Field
The invention relates to the technical field of energy storage auxiliary frequency modulation, and particularly belongs to a method for adjusting power of a generator set.
Background
In the current control strategy of the energy storage auxiliary frequency modulation, a generator set generates power by taking a power grid dispatching AGC instruction as a power target value, and energy storage equipment quickly and accurately absorbs and releases power for the deviation between the actually-sent power of the generator set and the power grid dispatching AGC instruction, so that the total power output deviation is eliminated, and the power response speed and the precision of the energy storage auxiliary frequency modulation generator set are improved.
Due to the fact that absorbed power and released power are not equal completely, after the auxiliary frequency modulation system operates for a period of time, the stored electric quantity of the energy storage device is higher and lower, the capability of absorbing or releasing power is reduced, and the energy storage device deviates from the optimal working point. The energy storage device needs to be charged or discharged.
In addition, during the charging and discharging actions of the energy storage device, the auxiliary frequency modulation may be degraded or the function may be suspended.
Disclosure of Invention
In the current control strategy of the energy storage auxiliary frequency modulation, a generator set takes a power grid dispatching AGC instruction as a power target value, and the generator set does not coordinate and consider the charging and discharging requirements of energy storage equipment.
If the power target value of the generator set comprises the charging and discharging requirements of the energy storage device besides the dispatching AGC command, under the control and regulation of the power target of the generator set, corresponding power deviation is generated between the actual generating power of the generator set and the dispatching AGC command. The energy storage device can absorb or release power for eliminating the multiple power deviation, so that the energy storage device can realize the effect of charging and discharging actions in the auxiliary frequency modulation process, and the auxiliary frequency modulation performance is not influenced.
Based on the analysis, the invention provides a power instruction strategy of the energy storage auxiliary frequency modulation generator set considering the energy storage requirement aiming at the conditions and requirements of the background technology, which can maintain proper stored electric quantity and can not reduce the auxiliary frequency modulation performance.
The power instruction strategy for the energy storage auxiliary frequency modulation generator set considering the energy storage requirement comprises chargeable and dischargeable energy storage equipment, a generator set and a power target value of the generator set based on an AGC (automatic gain control) instruction of a power grid, wherein the power target value of the generator set further comprises the charging and discharging requirement of the chargeable and dischargeable energy storage equipment, the charging requirement is to increase the power target value, and the discharging requirement is to reduce the power target value.
The calculation unit required by the charging and discharging requirements of the energy storage equipment is consistent with the unit of the power target value of the generator set, the numerical value and the change rate of the power target value are reasonably determined, and debugging and verification are carried out to avoid imbalance of the operation parameters of the generator set and repeated charging and discharging of the energy storage equipment.
FIG. 1: schematic diagram of power target values including charge and discharge requirements.
The charging and discharging requirements of the chargeable and dischargeable energy storage device are limited by the power range. And the limits of the charging and discharging power in the aspects of the load capacity, safety and efficiency of the equipment are comprehensively checked, and a proper value is determined.
The charge and discharge requirements of the chargeable and dischargeable energy storage device can be a serialized numerical value, a continuous change numerical value and a discontinuous change numerical value.
When the stored electric quantity is lower than the charging action value, generating a charging demand; when the charging is carried out until the stored electric quantity is higher than the charging stop value, the charging requirement is zero; the charging operation value is lower than the charging stop value.
When the stored electricity is higher than the discharge action value, generating a discharge demand; when the stored electric quantity is lower than the discharge stop value after discharging, the discharge demand is zero; the discharge operation value is higher than the discharge stop value.
The charge and discharge demand of the chargeable and dischargeable energy storage device may be a calculation result using the current stored electric quantity of the energy storage device as a variable.
The chargeable and dischargeable energy storage device can absorb and release electric energy and comprises mechanical energy storage, electromagnetic energy storage, electrochemical energy storage, chemical energy storage and heat and cold storage energy storage.
Chargeable and dischargeable energy storage device, including devices that can rapidly adjust a load. For example, the normal working power range of a certain refrigeration device is 2MW-10MW, the power consumption of the refrigeration device is deducted by the generating power of a generator set to respond to a power grid dispatching AGC instruction, and the refrigeration device assists the frequency modulation of the generator set by quickly adjusting the working power. The refrigeration equipment also has the power requirement of adjusting to the optimal load working point because of the factors such as equipment condition, load adjusting speed, adjusting margin and the like, and the power requirement is the same as the charge and discharge requirement of the energy storage equipment.
A chargeable and dischargeable energy storage device comprising an aggregation of a plurality of sub-energy storage devices under a total charge and discharge demand, a total absorbed released power schedule.
A genset comprising a combination of multiple gensets to maintain a common power target value.
In some cases, the charging and discharging requirements of the chargeable and dischargeable energy storage device may be provided by a third party device, such as a superior supervising device, an auxiliary optimization device, and the like.
The invention provides a power instruction strategy for an energy storage auxiliary frequency modulation generator set, which gives consideration to energy storage requirements and coordinately considers the charging and discharging requirements of energy storage equipment. Compared with the prior art, the performance and the available time of the auxiliary frequency modulation are improved, and the device has the advantages of reducing the equipment cost:
1. charging and discharging actions and modes are not specially considered, so that equipment arrangement can be reduced, and a control method can be simplified;
2. the energy storage equipment is ensured to be in the optimal working position at any time, and the capacity requirement of the energy storage equipment is reduced.
Drawings
Fig. 1 is a schematic diagram of a power target value including charge and discharge requirements.
FIG. 2 is a block diagram of the computational logic of charge and discharge requirements in a DCS.
FIG. 3 is a table and graph of F1(x) function parameter values
FIG. 4 is a table and graph of F2(x) function parameter values
Detailed Description
The first embodiment is as follows:
a1000 MW coal-fired unit 1 is provided with an iron phosphate lithium battery auxiliary frequency modulation device with 15MW power output and 15MWh energy storage capacity.
The method comprises the steps that the energy storage equipment is appointed to charge and discharge with 0.8MW power, the energy storage equipment sends out a charge and discharge demand signal in an analog quantity form after analysis and calculation according to the conditions of self stored electricity quantity, stored energy capacity, SOH, load prediction and the like, the +0.8MW represents the required charge power, the-0.8 MW represents the required discharge power, and the 0MW represents that the charge and the discharge are not needed at the moment.
And the charge and discharge demand signal is accessed into a DCS (distributed control system) of the generator set. In the DCS system generator set control logic, an AGC command and a charge-discharge demand signal are scheduled to be used as a power target value of a generator set, and the target value is used for controlling the actual generating power of the generator set.
Example two:
a1000 MW coal-fired unit 2 is provided with an iron phosphate lithium battery auxiliary frequency modulation device with 15MW power output and 15MWh energy storage capacity. And the appointed energy storage equipment sends an analog quantity SOC signal to a generator set DCS.
In practice, the following requirements apply:
1) the charge and discharge requirements vary between plus and minus 1.2MW, related to SOC.
2) The charge and discharge requirements change slowly, and the fluctuation is small, so that the equipment abrasion and the disturbance to the system are reduced.
3) Avoid the frequent charge and discharge actions. The reason for frequent actions is that the charge and discharge amount in a single charge and discharge process is too small, so that the charge and discharge are consumed in a short time and need to be carried out again, and the SOC interval range corresponding to the charge and discharge start and stop actions needs to be set and is properly enlarged.
4) Avoid the oscillation of charging and discharging actions. Because the generator set has large inertia and large dynamic error when adjusting the generating power, the charging and discharging requirements of the battery are easy to repeatedly and alternately oscillate between a positive value and a negative value, and the SOC interval range corresponding to the charging stopping action and the discharging starting action and the SOC interval range corresponding to the discharging stopping action and the charging starting action need to be properly increased.
5) The charging and discharging process has extra energy loss, and the total electric quantity of charging and discharging is strived to be reduced. The power grid dispatching AGC command and the unit generating power deviation both contain certain volatility, absorbed and released power can be offset within a period of time, the longer the time is, the higher the offset possibility is, the better the offset effect is, so the SOC interval range corresponding to the charging and discharging starting action is properly enlarged, and the charging and discharging requirements can be reduced.
The method is characterized by comprising the following steps: setting 35% as a charging action value, 55% as a charging stop value, 65% as a discharging action value and 45% as a discharging stop value corresponding to the battery stored electricity quantity, namely SOC, starting from a value of 0, when the SOC is reduced to 10%, the corresponding charging and discharging requirement is +1.2MW, when the SOC is increased to 90%, the corresponding charging and discharging requirement is-1.2 MW, and during the charging and discharging action, the charging and discharging requirement is basically kept stable.
And calculating a charge-discharge demand by using the SOC signal in the DCS of the generator set, and taking the charge-discharge demand and a scheduling AGC command as a power target value of the generator set to control the actual generating power of the generator set according to the target value.
FIG. 2: logic block diagram for calculating charge and discharge requirements in DCS (distributed control System)
FIG. 3: f1(x) function parameter value table and graph
FIG. 4 is a schematic view of: f2(x) function parameter value tables and graphs.
Claims (10)
1. A power instruction strategy for an energy storage auxiliary frequency modulation generator set considering energy storage requirements comprises chargeable and dischargeable energy storage equipment, a generator set and a power target value of the generator set based on an AGC (automatic gain control) instruction of power grid scheduling, and is characterized in that: the power target value of the generator set further comprises charging and discharging requirements of the chargeable and dischargeable energy storage equipment, the charging requirement is an increased power target value, and the discharging requirement is a decreased power target value.
2. The power command strategy of claim 1 for an energy storage assisted frequency modulation generator set with consideration of energy storage requirements, wherein: the charging and discharging requirements of the chargeable and dischargeable energy storage device are limited by the power range.
3. A power command strategy for an energy storage assisted frequency modulated generator set as claimed in claim 1, wherein the power command strategy is to take into account energy storage requirements: the charging and discharging requirements of the chargeable and dischargeable energy storage device can be a serialized numerical value, a continuous change numerical value and a discontinuous change numerical value.
4. The power command strategy of claim 1 for an energy storage assisted frequency modulation generator set with consideration of energy storage requirements, wherein:
(1) when the stored electric quantity is lower than the charging action value, a charging demand is generated,
(2) when the charging is carried out until the stored electric quantity is higher than the charging stop value, the charging requirement is zero,
(3) the charging action value is lower than the charging stop value,
(4) when the stored electricity is higher than the discharge action value, the discharge requirement is generated,
(5) when the stored electricity quantity is lower than the discharge stop value after discharging, the discharge demand is zero,
(6) the discharge operation value is higher than the discharge stop value.
5. A power command strategy for an energy storage assisted frequency modulated generator set as claimed in claim 1, wherein the power command strategy is to take into account energy storage requirements: the charge and discharge requirements of the chargeable and dischargeable energy storage device are calculation results with the current storage electric quantity of the energy storage device as a variable.
6. The power command strategy of claim 1 for an energy storage assisted frequency modulation generator set with consideration of energy storage requirements, wherein: the chargeable and dischargeable energy storage device can absorb and release electric energy and comprises mechanical energy storage, electromagnetic energy storage, electrochemical energy storage, chemical energy storage and heat and cold accumulation energy storage.
7. The power command strategy of claim 1 for an energy storage assisted frequency modulation generator set with consideration of energy storage requirements, wherein: the chargeable and dischargeable energy storage device comprises a device capable of quickly adjusting load.
8. The power command strategy of claim 1 for an energy storage assisted frequency modulation generator set with consideration of energy storage requirements, wherein: the chargeable and dischargeable energy storage device comprises aggregation of a plurality of sub energy storage devices under the scheduling of a total charge and discharge demand and a total absorption and release power.
9. The power command strategy of claim 1 for an energy storage assisted frequency modulation generator set with consideration of energy storage requirements, wherein: the power generating unit includes a combination of multiple power generating units for maintaining a common power target value.
10. A power command strategy for an energy storage assisted frequency modulated generator set as claimed in claim 1, wherein the power command strategy is to take into account energy storage requirements: the charging and discharging requirements of the chargeable and dischargeable energy storage device are provided by a third-party device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210251436.2A CN114513015A (en) | 2022-03-15 | 2022-03-15 | Power instruction strategy for energy storage auxiliary frequency modulation generator set considering energy storage requirement |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117769A (en) * | 2020-09-18 | 2020-12-22 | 深圳市图门新能源有限公司 | Energy storage AGC combined power grid frequency modulation system and power grid frequency modulation method |
| CN112202187A (en) * | 2020-11-03 | 2021-01-08 | 傲普(上海)新能源有限公司 | Method for determining energy storage output in frequency modulation of energy storage auxiliary thermal power generating unit |
| CN113964850A (en) * | 2021-10-26 | 2022-01-21 | 西安热工研究院有限公司 | A Coordinated Control System for Power Plant Energy Storage to Participate in AGC Frequency Regulation of Units |
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- 2022-03-15 CN CN202210251436.2A patent/CN114513015A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117769A (en) * | 2020-09-18 | 2020-12-22 | 深圳市图门新能源有限公司 | Energy storage AGC combined power grid frequency modulation system and power grid frequency modulation method |
| CN112202187A (en) * | 2020-11-03 | 2021-01-08 | 傲普(上海)新能源有限公司 | Method for determining energy storage output in frequency modulation of energy storage auxiliary thermal power generating unit |
| CN113964850A (en) * | 2021-10-26 | 2022-01-21 | 西安热工研究院有限公司 | A Coordinated Control System for Power Plant Energy Storage to Participate in AGC Frequency Regulation of Units |
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