CN112152245A - Charging and discharging control method and system for user side energy storage device - Google Patents
Charging and discharging control method and system for user side energy storage device Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 91
- 238000007599 discharging Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000004044 response Effects 0.000 claims abstract description 30
- 230000005611 electricity Effects 0.000 claims abstract description 11
- 230000009191 jumping Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 238000007726 management method Methods 0.000 description 23
- 238000012544 monitoring process Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000003139 buffering effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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
- 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
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Abstract
The invention discloses a charging and discharging control method and a charging and discharging control system for a user side energy storage device, wherein the method comprises the following steps: acquiring the total load power of the power grid side; acquiring the optimal response load power corresponding to the demand side in the current time period based on an electricity price standard comparison table formulated by the power grid side; and resetting the working mode and the operating parameters of the energy storage device by using the difference value between the total load power and the optimal response load power. According to the embodiment of the invention, the current working state of the energy storage device at the user side is in balance and adaptive to the actual running state of the power grid side, and the auxiliary running benefit of the energy storage device at the user side can be improved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a charging and discharging control method and system for a user-side energy storage device.
Background
With the deep innovation of power system innovation and the maturity of power demand side management, the government has a corresponding policy to encourage the energy storage device at the user side to serve as a demand response resource at the power grid side, and under the principle of combining scientificity and feasibility, the energy storage device at the user side is promoted to participate in peak clipping and valley filling at the power grid side, so that the economy of a power system is improved, and the experience demand of the user side is met. However, for the problem of the auxiliary operation benefit, it is a problem to be solved by the present invention whether the current working state of the energy storage device at the user side can be balanced and adapted to the actual operation state at the power grid side.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a charging and discharging control method and a charging and discharging control system for a user side energy storage device, so that the current working state of the user side energy storage device is balanced and adapted to the actual running state of a power grid side, and the auxiliary running benefit of the user side energy storage device can be improved.
In order to solve the above problem, the present invention provides a method for managing and controlling charging and discharging of a user-side energy storage device, where the method includes:
acquiring the total load power of the power grid side;
acquiring the optimal response load power corresponding to the demand side in the current time period based on an electricity price standard comparison table formulated by the power grid side;
and resetting the working mode and the operating parameters of the energy storage device by using the difference value between the total load power and the optimal response load power.
Optionally, after obtaining the total load power of the grid side, the method further includes:
acquiring the maximum allowable capacity of a transformer at the side of a power grid, and judging whether the total load power is greater than the maximum allowable capacity of the transformer;
after the total load power is judged to be larger than the maximum allowable capacity of the transformer, controlling the energy storage device to be in a disconnection state with the power grid side;
and after the total load power is judged to be less than or equal to the maximum allowable capacity of the transformer, acquiring the optimal response load power corresponding to the demand side in the current time period based on an electricity price standard comparison table formulated by the power grid side.
Optionally, the resetting the operating mode and the operating parameter of the energy storage device includes:
acquiring rated charging power and rated discharging power of the energy storage device;
judging whether the difference value is less than 0;
and after the difference value is judged to be less than 0, setting the working mode of the energy storage device as a charging mode, and acquiring the allowable charging time corresponding to the difference value based on the rated charging power.
Optionally, after determining whether the difference is smaller than 0, the method further includes:
and after the difference is judged to be greater than or equal to 0, setting the working mode of the energy storage device as a discharging mode, and obtaining the allowable discharging time corresponding to the difference based on the rated discharging power.
In addition, an embodiment of the present invention further provides a charge and discharge control system for a user-side energy storage device, where the system includes:
the acquisition module is used for acquiring the total load power of the power grid side;
the response module is used for acquiring the optimal response load power corresponding to the demand side in the current time period based on the electricity price standard comparison table formulated by the power grid side;
and the setting module is used for resetting the working mode and the operating parameters of the energy storage device by utilizing the difference value between the total load power and the optimal response load power.
Optionally, the system further includes:
the judging module is used for acquiring the maximum allowable capacity of the transformer at the power grid side and judging whether the total load power is greater than the maximum allowable capacity of the transformer; after the total load power is judged to be larger than the maximum allowable capacity of the transformer, controlling the energy storage device to be in a disconnection state with the power grid side; and after the total load power is judged to be less than or equal to the maximum allowable capacity of the transformer, jumping to the response module for execution.
Optionally, the setting module is configured to obtain a rated charging power and a rated discharging power of the energy storage device; and judging whether the difference value is less than 0; and after the difference value is judged to be less than 0, setting the working mode of the energy storage device as a charging mode, and acquiring the allowable charging time corresponding to the difference value based on the rated charging power.
Optionally, the setting module is further configured to set the operating mode of the energy storage device to be a discharge mode after determining that the difference is greater than or equal to 0, and obtain an allowable discharge duration corresponding to the difference based on the rated discharge power.
In the embodiment of the invention, the electricity price standard comparison table is used as the adjustment reference of the energy storage device at the user side, the optimal response load power of a specific section in a corresponding time period can be flexibly called, and the working mode of the energy storage device at the user side is adaptively adjusted according to the relation between the optimal response load power and the total load power at the current power grid side, so that the effective cooperative control of the power grid side and the energy storage device at the user side is maintained, and the auxiliary operation benefit of the energy storage device at the user side can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural component diagram of a user-side energy storage device disclosed in an embodiment of the present invention;
fig. 2 is a schematic flowchart of a charging and discharging control method for a user-side energy storage device according to an embodiment of the present invention;
fig. 3 is a schematic structural composition diagram of a charge and discharge control system of a user-side energy storage device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural composition diagram of a user-side energy storage device according to an embodiment of the present invention, where the energy storage device includes a power distribution control module, an energy storage control module, and a control management module; the power distribution control module is connected with a 10kV grid-connected voltage side, the power distribution control module is connected with a 380V low-voltage side, the energy storage control module is connected with the 380V low-voltage side, the power distribution control module is connected with the control management module, and the energy storage control module is connected with the control management module.
Furthermore, the power distribution control module comprises high-voltage switch equipment and a transformer, the low-voltage side of the transformer is connected with the 380V low-voltage side, the high-voltage side of the transformer is connected with the 10kV grid-connected voltage side through the high-voltage switch equipment, and the high-voltage switch equipment is connected with the control management module. The high-voltage switch equipment can cut off the electric connection between the energy storage device and the 10kV grid-connected voltage side, and the transformer can realize a voltage reduction function when the energy storage device performs charging work and can also realize a voltage boosting function when the energy storage device performs discharging work.
Furthermore, the energy storage control module comprises an inverter unit, an energy storage unit and a battery management unit; the inversion unit is connected with the 380V low-voltage side, the inversion unit is connected with the energy storage unit, the energy storage unit is connected with the battery management unit, the battery management unit is connected with the control management module, and the inversion unit is connected with the control management module. The inverter unit comprises a bidirectional energy storage inverter with the model of BNSX-10KTL, and a three-phase four-bridge arm structure is adopted to realize bidirectional conversion of alternating current voltage and direct current voltage; the energy storage unit comprises a capacitor C and a battery assembly, the battery assembly is connected with the inverter unit, the capacitor C is connected to two ends of the battery assembly in parallel, the battery assembly is used for storing the direct-current voltage output by the inverter unit or providing an available direct-current power supply for the inverter unit, and the capacitor C can filter the direct-current voltage transmitted to the battery assembly.
Specifically, the battery management unit comprises a voltage detection circuit, a hall current sensor and a temperature sensor, wherein the input end of the voltage detection circuit, the input end of the hall current sensor and the input end of the temperature sensor are respectively connected with the battery pack, and the output end of the voltage detection circuit, the output end of the hall current sensor and the output end of the temperature sensor are respectively connected with the control management module. The voltage detection circuit can be used for monitoring and reporting the voltage value of the battery assembly in real time, the Hall current sensor can be used for monitoring and reporting the charging current or the discharging current of the battery assembly in real time, and the temperature sensor can be used for monitoring and reporting the temperature information of the battery assembly in real time.
Furthermore, the control management module comprises a DSP processor with the model number of TMS320F2812, the working frequency of the DSP processor reaches 150M, the DSP processor has high-efficiency operation capability on each piece of real-time information, and the DSP processor can be in communication connection with the monitoring host through a built-in communication interface; in addition, the control management module further comprises an A/D sampling circuit connected with the input end of the DSP processor, and can sample the voltage signal output by the voltage detection circuit, the current signal output by the Hall current sensor and the temperature signal output by the temperature sensor according to an externally agreed system sampling frequency, and ensure that the three mentioned signals have corresponding relation at the same time. In the implementation process, the DSP can judge whether the energy storage control module has over-current, short-circuit and other fault phenomena by using a comparison result of a current signal and a preset current threshold value at the same moment, or can remotely control the on-off of the high-voltage switch equipment based on the connection relation between the power distribution control module and the control management module through a fault removal instruction sent by the monitoring host machine, so as to protect the power supply stability of the 10kV grid-connected voltage side; meanwhile, the DSP can acquire a voltage signal range corresponding to the temperature signal at the same moment in a table look-up mode, and when the voltage signal at the same moment is judged not to fall within the voltage signal range, corresponding SPWM waveform and switching signals are provided to control the inverter unit to realize output adjustment of direct current electric energy according to a power buffering instruction issued by the monitoring host, so that the service life of the battery pack is prolonged. In addition, the DSP can be according to the power supply instruction that monitoring host computer was issued, with battery pack is the energy supply end, control the reverse acquisition of the alternating current electric energy of contravariant unit completion is favorable to realizing the demand of filling the valley of despicking to the electric wire netting side high-efficiently.
Based on the structural composition schematic diagram of the user-side energy storage device provided in fig. 1, fig. 2 shows a flow schematic diagram of a charging and discharging control method of the user-side energy storage device in the embodiment of the present invention, where the method includes the following steps:
s101, acquiring total load power of a power grid side;
in the embodiment of the invention, the load collector appointed by the power company collects the total load power of the power grid side and uploads the related power data to the monitoring host, so that the subsequent direct calling is facilitated.
S102, acquiring the maximum allowable capacity of a transformer at the power grid side, and judging whether the total load power is larger than the maximum allowable capacity of the transformer;
in the embodiment of the invention, the maximum allowable capacity of the transformer can be obtained by directly reading the material information of the used transformer, a technician designs the transformer according to the normal aging temperature when designing the transformer, and if the maximum allowable capacity exceeds the limit temperature, the aging life of the transformer is influenced to be sharply increased, and the on-site use condition of the transformer is influenced, so that the maximum allowable capacity corresponding to the limit temperature needs to be set to protect the normal performance of the transformer. In the implementation process, the monitoring host will limit whether the energy storage device is safely incorporated into the grid side for use according to the maximum allowable capacity of the transformer, that is, by determining whether the total load power is greater than the maximum allowable capacity of the transformer, the determination result includes: when the total load power is greater than the maximum allowable capacity of the transformer, which indicates that the energy storage device may have a safety problem in the grid connection process, executing step S103; and when the total load power is less than or equal to the maximum allowable capacity of the transformer, indicating that the energy storage device has a safety condition in the grid connection process, continuing to execute the step S104.
S103, controlling the energy storage device to be in a disconnection state with the power grid side;
in the embodiment of the invention, based on the fact that the energy storage device is connected with the power grid side through the high-voltage switch equipment, when the monitoring host monitors a safety problem, a fault removal instruction is correspondingly generated and sent to the control management module, and at the moment, the control management module controls the high-voltage switch equipment to be disconnected according to the fault removal instruction, namely, the energy storage device does not support a grid connection function temporarily.
S104, acquiring the optimal response load power corresponding to the demand side in the current time period based on an electricity price standard comparison table formulated by the power grid side;
in the embodiment of the invention, the electric power personnel carry out fusion benefit analysis and power utilization planning according to daily power consumption of the user side and power utilization fee paid in the month in the last two years, and from the perspective of mutual benefit between the power grid side and the user side, the response power consumption in different time periods is planned for the user side by combining the adjusted power prices in different places, so that a power price standard comparison table is formed, and relevant working personnel can call out the optimal response load power corresponding to the power utilization side in a certain area in the current time period, namely the optimal load power allowed to be used by the user side in the current time period, so that the optimal load power is used as the comparison standard for setting the working mode and the operating parameters of the energy storage device.
And S105, resetting the working mode and the operating parameters of the energy storage device by using the difference value between the total load power and the optimal response load power.
In the embodiment of the invention, the rated charging power and the rated discharging power of the energy storage device are obtained by preferably inquiring the system parameters of the used battery assembly, and generally, the rated charging power is lower than the rated discharging power because the thermal safety risk of the battery assembly in the discharging stage is smaller; secondly, obtaining a difference value of subtracting the optimal response load power from the total load power, and judging whether the difference value is less than 0, wherein the judgment result comprises the following steps:
(1) when the difference is smaller than 0, the current power grid side is in a power utilization transition period, the monitoring host sets the working mode of the energy storage device to be a charging mode, generates a power buffering instruction by combining the difference and sends the power buffering instruction to the control management module, and meanwhile, the control management module divides the rated charging power and the current collected voltage signal to obtain the current residual capacity value of the energy storage device; at this time, the control management module analyzes the difference value according to the received electric power buffering instruction and converts the difference value into a corresponding charging amount, then obtains a minimum value from the current residual capacity value and the charging amount, and finally obtains the allowable charging time of the energy storage device by dividing the minimum value by the current collected current signal;
(2) when the difference is greater than or equal to 0, the current power grid side is in a power utilization shortage period, the monitoring host sets the working mode of the energy storage device to be a discharging mode, generates a power supply instruction by combining the difference and sends the power supply instruction to the control management module, and meanwhile, the control management module obtains the current residual capacity value of the energy storage device based on the calculation mode mentioned in the step (1); at the moment, the control management module analyzes the difference value according to the received power supply instruction and converts the difference value into corresponding discharge capacity, then obtains a minimum value from the current residual capacity value and the discharge capacity, and finally obtains the allowable discharge time of the energy storage device by dividing the minimum value by the current collected current signal.
Fig. 3 is a schematic structural composition diagram of a charge and discharge control system of a user-side energy storage device in an embodiment of the present invention, where the system includes:
an obtaining module 201, configured to obtain a total load power of a power grid side;
the judging module 202 is configured to obtain a maximum allowable capacity of a transformer on a power grid side, and judge whether the total load power is greater than the maximum allowable capacity of the transformer; after the total load power is judged to be larger than the maximum allowable capacity of the transformer, controlling the energy storage device to be in a disconnection state with the power grid side; after the total load power is judged to be less than or equal to the maximum allowable capacity of the transformer, jumping to the response module 203 for execution.
The response module 203 is used for acquiring the optimal response load power corresponding to the demand side in the current time period based on the electricity price standard comparison table formulated by the power grid side;
the setting module 204 is configured to reset the operating mode and the operating parameter of the energy storage device by using the difference between the total load power and the optimal response load power.
Specifically, the setting module 204 is configured to obtain a rated charging power and a rated discharging power of the energy storage device; and judging whether the difference value is less than 0; and after the difference value is judged to be less than 0, setting the working mode of the energy storage device as a charging mode, and acquiring the allowable charging time corresponding to the difference value based on the rated charging power. In addition, the setting module 204 is further configured to set the operating mode of the energy storage device to be a discharging mode after determining that the difference is greater than or equal to 0, and obtain an allowable discharging time duration corresponding to the difference based on the rated discharging power.
For the specific implementation of each module in the system, please refer to the above-mentioned embodiment, which is not described herein again.
In the embodiment of the invention, the electricity price standard comparison table is used as the adjustment reference of the energy storage device at the user side, the optimal response load power of a specific section in a corresponding time period can be flexibly called, and the working mode of the energy storage device at the user side is adaptively adjusted according to the relation between the optimal response load power and the total load power at the current power grid side, so that the effective cooperative control of the power grid side and the energy storage device at the user side is maintained, and the auxiliary operation benefit of the energy storage device at the user side can be improved.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
The method and the system for managing and controlling charging and discharging of the energy storage device on the user side provided by the embodiment of the invention are described in detail, a specific example is adopted in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A charging and discharging control method for a user side energy storage device is characterized by comprising the following steps:
acquiring the total load power of the power grid side;
acquiring the optimal response load power corresponding to the demand side in the current time period based on an electricity price standard comparison table formulated by the power grid side;
and resetting the working mode and the operating parameters of the energy storage device by using the difference value between the total load power and the optimal response load power.
2. The method for managing and discharging of the energy storage device at the user side according to claim 1, further comprising, after obtaining the total load power at the grid side:
acquiring the maximum allowable capacity of a transformer at the side of a power grid, and judging whether the total load power is greater than the maximum allowable capacity of the transformer;
after the total load power is judged to be larger than the maximum allowable capacity of the transformer, controlling the energy storage device to be in a disconnection state with the power grid side;
and after the total load power is judged to be less than or equal to the maximum allowable capacity of the transformer, acquiring the optimal response load power corresponding to the demand side in the current time period based on an electricity price standard comparison table formulated by the power grid side.
3. The method for managing and controlling charging and discharging of the energy storage device at the user side according to claim 1, wherein the resetting of the working mode and the operating parameters of the energy storage device comprises:
acquiring rated charging power and rated discharging power of the energy storage device;
judging whether the difference value is less than 0;
and after the difference value is judged to be less than 0, setting the working mode of the energy storage device as a charging mode, and acquiring the allowable charging time corresponding to the difference value based on the rated charging power.
4. The method for managing and controlling charging and discharging of the energy storage device at the user side according to claim 3, further comprising, after determining whether the difference is smaller than 0:
and after the difference is judged to be greater than or equal to 0, setting the working mode of the energy storage device as a discharging mode, and obtaining the allowable discharging time corresponding to the difference based on the rated discharging power.
5. The utility model provides a user side energy memory's charge-discharge management and control system which characterized in that, the system includes:
the acquisition module is used for acquiring the total load power of the power grid side;
the response module is used for acquiring the optimal response load power corresponding to the demand side in the current time period based on the electricity price standard comparison table formulated by the power grid side;
and the setting module is used for resetting the working mode and the operating parameters of the energy storage device by utilizing the difference value between the total load power and the optimal response load power.
6. The system according to claim 5, further comprising:
the judging module is used for acquiring the maximum allowable capacity of the transformer at the power grid side and judging whether the total load power is greater than the maximum allowable capacity of the transformer; after the total load power is judged to be larger than the maximum allowable capacity of the transformer, controlling the energy storage device to be in a disconnection state with the power grid side; and after the total load power is judged to be less than or equal to the maximum allowable capacity of the transformer, jumping to the response module for execution.
7. The system according to claim 5, wherein the setting module is configured to obtain a rated charging power and a rated discharging power of the energy storage device; and judging whether the difference value is less than 0; and after the difference value is judged to be less than 0, setting the working mode of the energy storage device as a charging mode, and acquiring the allowable charging time corresponding to the difference value based on the rated charging power.
8. The system according to claim 7, wherein the setting module is further configured to set the operating mode of the energy storage device to be a discharging mode after determining that the difference is greater than or equal to 0, and obtain an allowable discharging duration corresponding to the difference based on the rated discharging power.
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