CN112886626A - Master-slave energy storage system of optical storage charging station and power tracking control method thereof - Google Patents
Master-slave energy storage system of optical storage charging station and power tracking control method thereof Download PDFInfo
- Publication number
- CN112886626A CN112886626A CN202110368004.5A CN202110368004A CN112886626A CN 112886626 A CN112886626 A CN 112886626A CN 202110368004 A CN202110368004 A CN 202110368004A CN 112886626 A CN112886626 A CN 112886626A
- Authority
- CN
- China
- Prior art keywords
- energy storage
- storage system
- master
- power
- slave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- H02J3/28—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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
-
- 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
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a power tracking control method for a master-slave energy storage system of an optical storage charging station, wherein when the optical storage charging station operates off-grid, a bidirectional converter of a master energy storage system adopts constant voltage control, an intelligent electric meter collects current information and bus voltage information of the master energy storage system and sends the current information and the bus voltage information to an energy management system, the energy management system calculates to obtain real-time power of the master energy storage system and sends the real-time power to the bidirectional converter of a slave energy storage system for power tracking, and the slave energy storage system takes a power signal as an input reference value of constant power control and performs constant power control on the converter. The invention further provides a master-slave energy storage system of the optical storage charging station. According to the invention, the output power of the master-slave energy storage system is equalized while the direct-current bus voltage is stabilized, and meanwhile, the hysteresis link is added, so that the frequent fluctuation of the output power of the master-slave energy storage system is prevented.
Description
Technical Field
The invention relates to a control method and a control system for a master-slave energy storage system of an off-grid type optical storage charging station, in particular to the master-slave energy storage system of the optical storage charging station and a power tracking control method thereof, and belongs to the technical field of energy management of the optical storage charging station in an off-grid state.
Background
In the modern society advocating low-carbon travel, electric automobiles are favored by more and more consumers, and the electric automobiles show wide prospects. The development and popularization of electric vehicles depend on the perfection of charging supporting facilities, the problems that the current building of charging stations is insufficient in high-power consumption demand and power distribution capacity, the power consumption peak period of the charging stations is overlapped with the power consumption peak period of industrial and commercial loads and the like are solved, and the application demands of various large and medium-sized electric vehicle charging stations can be met by the optical storage charging stations. Compared with a conventional charging station, the photovoltaic power generation system and the energy storage system with certain capacity are arranged in the station, and the system usually needs two or more energy storage systems to run in parallel in consideration of the power level of a single energy storage converter.
In the existing parallel control method of the energy storage system during off-grid operation of the optical storage charging station, a main energy storage unit adopts constant voltage control to stabilize the voltage of a direct current bus, an upper-layer EMS (energy management system) is dispatched from an energy storage unit, constant power control is adopted, and a power reference value is always given a fixed value. And in practical application, because photovoltaic power generation and fill electric pile load and all have intermittent type nature and volatility, must lead to the fact main energy storage system charge-discharge to switch frequently like this, when powerful electric pile that fills inserts, can lead to main energy storage system discharge power to exceed the threshold value, lead to main energy storage system to shut down to lead to whole light to store up the paralysis that fills the system. Meanwhile, the slave energy storage system is charged and discharged with constant power, so that the SOC difference of the master energy storage system and the slave energy storage system is too large, and the service life of the master energy storage system is even influenced.
Disclosure of Invention
The invention aims to solve the problems and provides a power tracking control method for a master-slave energy storage system of an optical storage charging station, which ensures that the voltage of a direct-current bus is constant when the system operates, can realize the real-time power sharing of the master-slave energy storage system, and ensures the stable operation of the system. In another aspect of the invention, the master-slave energy storage system of the optical storage charging station is also provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power tracking control method for a master-slave energy storage system of an optical storage charging station is disclosed, wherein the master-slave energy storage system of the optical storage charging station comprises a master energy storage system connected with a direct current bus, a slave energy storage system, a photovoltaic power generation system, a plurality of charging piles, an intelligent ammeter and an energy management system, the master energy storage system and the slave energy storage system both comprise a storage battery and a bidirectional converter, the photovoltaic power generation system comprises a photovoltaic assembly and a converter, and the energy management system is electrically connected or in communication connection with all devices in the optical storage charging station, and is characterized in that: when the optical storage charging station operates off-grid, the bidirectional converter of the main energy storage system is controlled by a constant voltage, the intelligent electric meter collects current information and bus voltage information of the main energy storage system and sends the current information and the bus voltage information to the energy management system, the energy management system calculates real-time power of the main energy storage system and sends the real-time power to the bidirectional converter of the slave energy storage system for power tracking, and the slave energy storage system takes the power signal as an input reference value of constant power control and controls the converter of the slave energy storage system for constant power.
Furthermore, when the real-time power output by the main energy storage system is within a set fluctuation range, the slave energy storage system does not perform power tracking. Therefore, a hysteresis link is added in the power tracking control of the main energy storage system and the slave energy storage system, and the slave energy storage system does not perform power tracking in a small fluctuation range of the output power of the main energy storage system, so that the frequent fluctuation of the output power of the main energy storage system and the slave energy storage system is prevented.
Further, the fluctuation range is +/-2-5%. And in the small fluctuation range of the output power of the main energy storage system, the slave energy storage system does not perform power tracking, so that the frequent fluctuation of the output power of the master energy storage system and the slave energy storage system is prevented.
Further, the stated is ± 2%. And in the small fluctuation range of the output power of the main energy storage system, the slave energy storage system does not perform power tracking, so that the frequent fluctuation of the output power of the master energy storage system and the slave energy storage system is prevented.
Further, the intelligent electric meter comprises a current transformer and a voltage transformer, wherein the voltage transformer reads the bus voltage Udc, and the current transformer collects the current idc of the main energy storage system.
Further, when the energy management system does not receive feedback information of a certain charging pile, the charging pile is marked to be in an off-line state, and the limiting power of the charging pile in the off-line state is reduced according to off-line logic. If the controller of the energy management system does not receive feedback information of any sub-equipment, the energy management system marks the sub-equipment to be in an off-line state, and the off-line charging pile reduces an operation strategy for setting limited power according to the set off-line logic, so that the whole master-slave energy storage system of the optical storage charging station is protected.
Furthermore, the energy management system issues control commands to the main energy storage system, the auxiliary energy storage system and each charging pile through the communication interfaces of the energy management system.
Furthermore, the charging pile is a direct current charging pile or an alternating current charging pile. The invention can be applied to a direct current light storage charging station or an alternating current light storage charging station.
On the other hand, the invention also provides a master-slave energy storage system of the optical storage charging station, which comprises a master energy storage system, a slave energy storage system, a photovoltaic power generation system, a plurality of charging piles, an intelligent ammeter and an energy management system, wherein the master energy storage system and the slave energy storage system are connected with the direct current bus, the master energy storage system and the slave energy storage system respectively comprise a storage battery and a bidirectional converter, the photovoltaic power generation system comprises a photovoltaic component and a converter, the energy management system is electrically connected or in communication connection with all devices in the optical storage charging station, and the master-slave energy storage system is characterized in that: the intelligent electric meter collects current information and bus voltage information of the main energy storage system and sends the current information and the bus voltage information to the energy management system, the energy management system calculates real-time power of the main energy storage system and sends the real-time power to the bidirectional converter of the slave energy storage system for power tracking, and the slave energy storage system takes the power signal as an input reference value for constant power control and carries out constant power control on the converter.
Furthermore, the charging pile is a direct current charging pile or an alternating current charging pile.
Compared with the prior art, the invention has the advantages that:
the master-slave energy storage system and the power tracking control method of the optical storage charging station are suitable for the optical storage charging station in an off-grid (power grid) running state. The output power of the main energy storage system is obtained through calculation by detecting the output current and voltage of a main energy storage system converter in an optical storage charging station and sending the output current and voltage to an Energy Management System (EMS), and the output power is used as a power reference value of a slave energy storage system converter, so that the output power of the main energy storage system and the slave energy storage system can be uniformly distributed while the bus voltage is stabilized, and meanwhile, a hysteresis loop is added to prevent the frequent fluctuation of the output power of the main energy storage system and the slave energy storage system.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a system diagram of a DC light storage and charging station of the present invention;
FIG. 2 is a system diagram of an AC optical storage and charging station of the present invention;
FIG. 3 is a flow chart of the energy management regulation and control of the offline master-slave energy storage power tracking control of the present invention;
fig. 4 is a diagram of the regulation of the received power information of the converter of the energy storage system according to the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
Example 1:
a master-slave energy storage system of an optical storage charging station comprises a master energy storage system, a slave energy storage system, a photovoltaic power generation system, a plurality of charging piles, an intelligent ammeter and an energy management system, wherein the master energy storage system and the slave energy storage system are connected with a direct-current bus and respectively comprise a storage battery and a bidirectional converter, the photovoltaic power generation system comprises a photovoltaic assembly and a converter, the energy management system is electrically connected or in communication connection with all devices in the optical storage charging station, the intelligent ammeter collects current information and bus voltage information of the master energy storage system and sends the current information and the bus voltage information to the energy management system, the energy management system calculates to obtain real-time power of the master energy storage system and sends the real-time power to the bidirectional converter of the slave energy storage system for power tracking, and the slave energy storage system takes the power signal as an input reference value of constant power control. The charging pile is a direct current charging pile or an alternating current charging pile.
Fig. 1 shows a schematic diagram of a dc light storage charging station. As shown in fig. 1, the optical storage charging station comprises a set of main energy storage system, a set of main energy storage system and a set of photovoltaic power generation system, wherein the main energy storage system, the slave energy storage system, the photovoltaic power generation system and a plurality of charging piles are all connected to a direct current bus, the optical storage charging station further comprises an intelligent ammeter and an energy management system (EMS system), the main energy storage system and the slave energy storage system both comprise storage batteries and a bidirectional converter, and the storage batteries can be a group or a plurality of groups formed by a plurality of storage batteries. The photovoltaic power generation system comprises a photovoltaic assembly and a current transformer, the intelligent ammeter comprises a current transformer CT and a voltage transformer PT, the voltage transformer PT reads bus voltage Udc, and the current transformer CT collects current idc of a main energy storage system; the EMS system is electrically connected or in communication connection with all equipment in the optical storage charging station, specifically, the EMS system is electrically connected with the intelligent electric meter and in communication connection with the main energy storage system, the auxiliary energy storage system, the photovoltaic power generation system and the charging pile. The communication mode can be a wired mode or a wireless mode.
The charging pile in the invention can be a direct current charging pile or an alternating current charging pile, and correspondingly, the converters in the master energy storage system and the slave energy storage system are bidirectional DC/DC converters or bidirectional AC/DC converters, as shown in fig. 1 and fig. 2.
The EMS system can send a query instruction through the controller of the EMS system and receive feedback information of the offline state and real-time parameters of each device in the optical storage charging station, and the intelligent electric meter collects the current of the main energy storage system and the voltage of a bus and sends the current and the voltage to the EMS controller. The bidirectional DC/DC converter of the main energy storage system adopts constant voltage control, the EMS controller issues control commands to the main energy storage system, the slave energy storage system and each charging pile through the communication interface, and the power control function can be regulated and controlled through the control commands issued by the EMS controller. And the EMS controller realizes station energy management and scheduling according to a power tracking control method when the station is off-grid according to the information of the photovoltaic converter, the master/slave energy storage bidirectional converter and the charging pile of the light storage charging station.
Example 2:
a master-slave energy storage system power tracking control method of an optical storage charging station is used for carrying out power tracking and control on a master energy storage system and a slave energy storage system of the optical storage charging station in an off-grid running state, and comprises the following specific steps:
when the light storage charging station operates off the grid, the bidirectional converter of the main energy storage system adopts constant voltage control, so that the bus voltage is stabilized. The intelligent electric meter comprises a main energy storage system, an EMS system, a current transformer, a voltage transformer, a bus voltage Udc and a bidirectional converter, wherein the current transformer of the intelligent electric meter collects the current idc of the main energy storage system, the voltage transformer of the intelligent electric meter collects the bus voltage Udc and sends the bus voltage Udc to the EMS system, the EMS system calculates and obtains the real-time power Pdc of the main energy storage system, the Pdc is Udc and idc, and the EMS system sends the real-time power signal to the bidirectional converter. The real-time power signal is received from a bidirectional converter of the energy storage system, as shown in fig. 4, the real-time power signal is used as a power reference value of the slave energy storage system, constant power control is performed on the DC/DC converter, a current control reference value of the slave energy storage transformer is obtained through a PI controller, a PWM trigger signal of the slave energy storage system is obtained after a direct current difference value of the slave energy storage system passes through a PI control link, and charging and discharging power of the slave energy storage system is controlled, so that tracking control of the slave energy storage system on power of the master energy storage system is realized.
According to the conservation of power, the output power of a DC/DC converter of the main energy storage system is reduced from large to small, and the given power value of the auxiliary energy storage system is reduced, so that the main energy storage system and the auxiliary energy storage system can fluctuate frequently.
In order to prevent the output power of the master energy storage system and the slave energy storage system from frequently fluctuating, when the real-time power output by the master energy storage system is in a set fluctuation range, the slave energy storage system does not perform power tracking. Therefore, a hysteresis link is added in the power tracking control of the main energy storage system and the slave energy storage system, and the slave energy storage system does not perform power tracking in a small fluctuation range of the output power of the main energy storage system, so that the output current sharing of the main energy storage system and the slave energy storage system is realized. The set fluctuation range can be +/-2-5%, in the embodiment, +/-2% is taken, namely when the output power of the main energy storage system is +/-2%, the slave energy storage system does not perform power tracking; as shown in fig. 3.
If the EMS controller does not receive the feedback information of any sub-equipment, the EMS controller marks the sub-equipment to be in an off-line state, and the off-line charging pile reduces the operation strategy of setting the limited power according to the established off-line logic to play a role in protecting the whole system.
The power tracking control method for the master-slave energy storage system of the off-grid type alternating current optical storage charging station in the embodiment is used for the master-slave energy storage system of the off-grid type alternating current optical storage charging station, and is the same as or similar to the power tracking control method for the master-slave energy storage system of the off-grid type direct current optical storage charging station, and is not repeated herein.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110368004.5A CN112886626A (en) | 2021-04-06 | 2021-04-06 | Master-slave energy storage system of optical storage charging station and power tracking control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110368004.5A CN112886626A (en) | 2021-04-06 | 2021-04-06 | Master-slave energy storage system of optical storage charging station and power tracking control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112886626A true CN112886626A (en) | 2021-06-01 |
Family
ID=76040499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110368004.5A Pending CN112886626A (en) | 2021-04-06 | 2021-04-06 | Master-slave energy storage system of optical storage charging station and power tracking control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112886626A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116706971A (en) * | 2023-06-26 | 2023-09-05 | 苏州海鹏科技有限公司 | Hierarchical control method suitable for energy scheduling of optical storage system |
| CN118944082A (en) * | 2024-08-06 | 2024-11-12 | 国网湖南综合能源服务有限公司 | A method, device, equipment, medium and product for controlling a distributed energy storage system in an agricultural distribution network |
-
2021
- 2021-04-06 CN CN202110368004.5A patent/CN112886626A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116706971A (en) * | 2023-06-26 | 2023-09-05 | 苏州海鹏科技有限公司 | Hierarchical control method suitable for energy scheduling of optical storage system |
| CN118944082A (en) * | 2024-08-06 | 2024-11-12 | 国网湖南综合能源服务有限公司 | A method, device, equipment, medium and product for controlling a distributed energy storage system in an agricultural distribution network |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103427430B (en) | A kind of energy management method of mixed energy storage system in microgrid | |
| CN103532158B (en) | A kind of micro-grid new energy hybrid energy storage system | |
| CN113644736B (en) | 5G base station smart microgrid multi-source power supply system | |
| US20110107123A1 (en) | Power control system for distributing power to power demanding facility | |
| CN106505615A (en) | A power supply system for electric vehicle charging station based on independent microgrid | |
| CN101814769A (en) | Electricity supply system of wind and light commercial power complementary communication base station | |
| CN104201755B (en) | Vehicle-mounted diesel generating system under a kind of DC distribution mode and energy management method thereof | |
| CN103545907A (en) | Photovoltaic DC power supply system and control method for office use | |
| CN106427640A (en) | Distributed energy source and electric vehicle wireless power supply integrated system based on magnetic resonance coupling technology | |
| CN110571906A (en) | Working state self-adaptive control method for power station with multiple working modes | |
| CN102468678A (en) | Power grid optimization direct current charging system | |
| CN112994059A (en) | Station network interactive type optical storage and charging intelligent charging station control architecture and control method | |
| CN108382221A (en) | The charging station energy efficiency managing method of intelligence | |
| CN111231713A (en) | Electric automobile charging and discharging system and control method | |
| CN113608571A (en) | Flexible power tracking control method for photovoltaic power generation unit and application thereof | |
| CN113377150A (en) | MPPT self-adaptive switching control method and system for light storage system | |
| CN115441486A (en) | Light storage charging and discharging battery replacing system and system matching method | |
| CN105610190A (en) | Comprehensive utilization device and system for renewable energy feedback of rail transit vehicle | |
| CN111231728A (en) | Photovoltaic energy storage charging and discharging integrated energy control system and method | |
| CN115173466A (en) | Photovoltaic-charging pile-building integrated alternating current-direct current microgrid system and control method | |
| CN112886626A (en) | Master-slave energy storage system of optical storage charging station and power tracking control method thereof | |
| CN112046328B (en) | Electric bicycle battery centralized charging and replacing system with energy bidirectional flow function | |
| CN212304790U (en) | Vehicle-mounted micro-grid with solar panel and power plant formed by polymerizing same | |
| CN215322084U (en) | Energy storage type direct current charging pile | |
| CN110048497A (en) | The control method of direct-current grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210922 Address after: 213031 Tianhe PV Industrial Park No. 2, Xinbei District, Changzhou, Jiangsu Applicant after: TRINA ENERGY STORAGE SOLUTIONS (JIANGSU) CO.,LTD. Address before: 213031 Tianhe PV Industrial Park No. 2, Xinbei District, Changzhou, Jiangsu Applicant before: TRINASOLAR Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |