CN112350356A - Local stability-maintaining type microgrid - Google Patents
Local stability-maintaining type microgrid Download PDFInfo
- Publication number
- CN112350356A CN112350356A CN202011091334.6A CN202011091334A CN112350356A CN 112350356 A CN112350356 A CN 112350356A CN 202011091334 A CN202011091334 A CN 202011091334A CN 112350356 A CN112350356 A CN 112350356A
- Authority
- CN
- China
- Prior art keywords
- microgrid
- voltage
- bus
- main circuit
- controller
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
Abstract
The invention provides a local-dimensional stable micro-grid, which comprises: the microgrid comprises a microgrid bus, a distributed power supply, an energy storage module, a bidirectional inverter, a load and a microgrid controller; the energy storage module is connected with the microgrid bus through the bidirectional inverter, and the distributed power supply and the load are both connected with the microgrid bus; the microgrid controller is respectively connected with the microgrid bus, the energy storage module and the bidirectional inverter; the microgrid controller is used for controlling the bidirectional inverter to work according to main circuit voltage and residual electric quantity, the main circuit voltage is the voltage of a microgrid bus, and the residual electric quantity is the real-time electric quantity of the energy storage module. According to the local-dimensional micro-grid provided by the invention, when the main circuit voltage is too low, the micro-grid bus can be boosted through the discharge of the energy storage module, so that the voltage interference resistance of the micro-grid bus is improved, the stability of the main circuit voltage is favorably improved, and the power supply reliability of the micro-grid is further improved.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to a local-dimensional stable micro-grid.
Background
The micro-grid can stably operate on the premise that the micro-grid is safe and reliable to operate and can bring benefits into play. The benefits of the micro-grid can be fully developed only by connecting the micro-grid to the grid and ensuring that the isolated grid is stable, the isolation is fast enough, the seamless switching is realized and the plug and play of the micro-grid is really realized. Due to the common characteristics of low overload capacity, small inertia or no inertia of the distributed power generation power supply of the micro-grid and the problems of sudden change of loads in the micro-grid and the like, the micro-grid system is easy to oscillate and even collapse, and the development and application of the micro-grid are severely restricted. To improve this situation, energy storage devices are commonly used in current microgrid structures to stabilize system transients and provide voltage and frequency support for the microgrid when necessary.
The existing micro-grid energy storage equipment cannot be flexibly charged, and has large use limitation; or directly through the distributed power supply inlet wire, it is big to the distributed power supply dependence, and is unfavorable for distributed power supply's stable output.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a local-dimensional stable micro-grid.
The invention provides a local-dimensional stable micro-grid, which comprises: the microgrid comprises a microgrid bus, a distributed power supply, an energy storage module, a bidirectional inverter, a load and a microgrid controller;
the energy storage module is connected with the microgrid bus through the bidirectional inverter, and the distributed power supply and the load are both connected with the microgrid bus; the microgrid controller is respectively connected with the microgrid bus, the energy storage module and the bidirectional inverter;
the microgrid controller is used for controlling the bidirectional inverter to work according to main circuit voltage and residual electric quantity, the main circuit voltage is the voltage of a microgrid bus, and the residual electric quantity is the real-time electric quantity of the energy storage module.
Preferably, the microcontroller is used for monitoring the main circuit voltage and the residual capacity in real time.
Preferably, the microgrid controller is configured to switch the bidirectional inverter to the charging state when the remaining power is lower than a preset power lower limit value and the main circuit voltage is normal; and the bidirectional inverter is also used for switching the bidirectional inverter to a discharging state when the residual electric quantity is greater than the electric quantity upper limit value and the main circuit voltage is lower than a preset voltage threshold interval.
Preferably, the microgrid controller is further connected to a load, and the microgrid controller is configured to adjust the working power of the load according to the power of the microgrid bus when the main grid voltage is lower than a preset voltage threshold interval and the remaining power is smaller than the power lower limit value.
Preferably, a power supply line and a voltage dividing line are connected in parallel between the distributed power supply and the alternating current bus, and the resistance value of the voltage dividing line is greater than that of the power supply line; the microgrid controller is respectively connected with the power supply circuit and the voltage division circuit and is used for controlling the switching-on of the two circuits.
Preferably, the power supply line is conducted under normal conditions; the microgrid controller is used for controlling the voltage division line to be conducted when the main circuit voltage is higher than the voltage threshold interval.
Preferably, a sliding rheostat is connected in series on the voltage dividing line, and the microgrid controller is connected with the sliding rheostat; the microgrid controller is used for controlling the sliding rheostat to slide according to the distance between the main circuit voltage and the voltage threshold interval.
Preferably, the alarm device further comprises an alarm device, the microgrid controller is connected with the alarm device, and the microgrid controller is used for controlling the alarm device to alarm when the main voltage is higher than the voltage threshold interval.
Preferably, the microgrid controller is further used for controlling the alarm to alarm when the duration of the main circuit voltage lower than the voltage threshold interval reaches a preset time threshold.
Preferably, the distributed power supply comprises: the energy storage module adopts a storage battery and/or a super capacitor.
According to the local-dimensional micro-grid provided by the invention, when the main circuit voltage is too low, the micro-grid bus can be boosted through the discharge of the energy storage module, so that the voltage interference resistance of the micro-grid bus is improved, the stability of the main circuit voltage is favorably improved, and the power supply reliability of the micro-grid is further improved.
In the invention, the energy storage module supplements the circuit through the microgrid bus. Therefore, the energy storage module can be regarded as a common load when being charged, the condition that the output of the distributed power supply is unstable due to the fact that the energy storage module is charged from the distributed power supply is avoided, and the working stability of the distributed power supply is guaranteed. In addition, the energy storage module is charged through the microgrid bus, so that the limitation of the installation position of the energy storage module is reduced, and the flexible arrangement of the energy storage module is improved.
Drawings
Fig. 1 is a structural diagram of a local-dimensional stable micro-grid provided by the invention;
fig. 2 is a structural diagram of another partially-maintained microgrid provided by the invention.
Detailed Description
Referring to fig. 1, the present invention provides a local-stability-maintaining microgrid, including: the microgrid comprises a microgrid bus A, a distributed power supply, an energy storage module, a bidirectional inverter, a load and a microgrid controller.
The energy storage module is connected with the microgrid bus A through the bidirectional inverter, and the energy storage module can draw electric energy from the microgrid bus A to charge and can also supply power to the microgrid bus A according to the charging and discharging states of the bidirectional inverter. Specifically, the energy storage module may adopt a storage battery or a super capacitor.
The distributed power supply and the load are both connected with the microgrid bus A, and the distributed power supply is used for supplying power to the microgrid bus A. Specifically, in the present embodiment, the distributed power supply includes: hydroelectric power generation systems, wind power generation systems, photovoltaic power supply systems, and the like.
The microgrid controller is respectively connected with the microgrid bus A, the energy storage module and the bidirectional inverter. The microgrid controller is used for monitoring the main circuit voltage and the residual electric quantity in real time. Specifically, in this embodiment, the microgrid controller may collect the main circuit voltage through a voltage sensor disposed on the microgrid bus a.
The microgrid controller is used for controlling the bidirectional inverter to work according to main circuit voltage and residual electric quantity, the main circuit voltage is the voltage of a microgrid bus A, and the residual electric quantity is the real-time electric quantity of the energy storage module.
Specifically, in this embodiment, the microgrid controller is configured to switch the bidirectional inverter to the charging state when the remaining power is lower than a preset power lower limit value and the main circuit voltage is normal; and the bidirectional inverter is also used for switching the bidirectional inverter to a discharging state when the residual electric quantity is greater than the electric quantity upper limit value and the main circuit voltage is lower than a preset voltage threshold interval. The electric quantity upper limit value is larger than the electric quantity lower limit value.
Therefore, in the embodiment, when the main circuit voltage is too low, the micro-grid bus A can be boosted through the discharge of the energy storage module, so that the voltage interference resistance of the micro-grid bus A is improved, the stability of the main circuit voltage is favorably improved, and the power supply reliability of the micro-grid is improved. Specifically, in this embodiment, the energy storage module supplements the circuit through the microgrid bus a. Therefore, the energy storage module can be regarded as a common load when being charged, the condition that the output of the distributed power supply is unstable due to the fact that the energy storage module is charged from the distributed power supply is avoided, and the working stability of the distributed power supply is guaranteed. In addition, in the embodiment, the energy storage module is charged through the microgrid bus A, so that the limitation of the installation position of the energy storage module is reduced, and the flexible arrangement of the energy storage module is improved.
In this embodiment, the microgrid controller is further connected to a load, and the microgrid controller is configured to adjust a working power of the load according to a power of the microgrid bus a when the main grid voltage is lower than a preset voltage threshold interval and the remaining power is smaller than the power lower limit value. That is, when the main circuit voltage is too low and cannot be supplemented by the energy storage module, the load consumption can be reduced by disconnecting part of the load, so that the normal operation of the load without disconnection is ensured. In specific implementation, a load offline sequence can be set in the microgrid controller, so that when the main circuit voltage is too low and cannot be supplemented through the energy storage module, the load offline is controlled according to the offline sequence, and the power supply requirement of an important load is ensured as much as possible.
Referring to fig. 2, in the present embodiment, a power supply line and a voltage dividing line are connected in parallel between the distributed power source and the ac bus, and a resistance value of the voltage dividing line is larger than a resistance value of the power supply line. The microgrid controller is respectively connected with the power supply circuit and the voltage division circuit and is used for controlling the switching-on of the two circuits. Specifically, the power supply line is turned on in a normal state. The microgrid controller is used for controlling the voltage division line to be conducted when the main circuit voltage is higher than the voltage threshold interval. Therefore, in the embodiment, in a normal state, the distributed power supply supplies power to the micro-grid bus A through the power supply line, so that the line loss is reduced, and the electric energy utilization rate is improved; when the main circuit voltage is too high, the distributed power supply supplies power to the microgrid bus A through the voltage dividing circuit, voltage can be divided through the voltage dividing circuit, the alternating current bus is reduced, and therefore safe work of the load is guaranteed.
In the present embodiment, a sliding varistor is connected in series to the voltage dividing line, and the microgrid controller is connected to the sliding varistor. The microgrid controller is used for controlling the sliding rheostat to slide according to the distance between the main circuit voltage and the voltage threshold interval. Specifically, the voltage threshold interval is [ voltage lower limit value, voltage upper limit value ], and the distance between the main circuit voltage and the voltage threshold interval is equal to the difference between the main circuit voltage and the voltage upper limit value. In specific implementation, the larger the distance between the main circuit voltage and the voltage threshold interval is, the larger the resistance value realized by the sliding rheostat is.
In this embodiment, the microgrid controller is connected to the alarm, and is configured to control the alarm to alarm when the main voltage is higher than the voltage threshold interval. Therefore, the alarm can be used for alarming, workers can be informed of troubleshooting of the distributed power supply inlet wire in time, and unstable voltage of the microgrid and electric energy waste on a voltage dividing circuit caused by long-time high-voltage discharge of the distributed power supply are avoided.
In this embodiment, the microgrid controller is further configured to control the alarm to alarm when a duration of the main circuit voltage being lower than the voltage threshold reaches a preset time threshold. So, through energy storage module's setting for the little electric wire netting has possessed anti low pressure disturbance ability, thereby ignores the processing to the low pressure disturbance of short time, is favorable to avoiding redundant data's production, reduces data processing volume, improves electric wire netting work efficiency. Through the setting of the practical threshold value, the abnormity of the micro-grid can be found in time through low-voltage overtime alarm, so that the processing is carried out, and the safe and reliable work of the micro-grid is ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (10)
1. A locally-maintained microgrid, comprising: the microgrid system comprises a microgrid bus (A), a distributed power supply, an energy storage module, a bidirectional inverter, a load and a microgrid controller;
the energy storage module is connected with the microgrid bus (A) through the bidirectional inverter, and the distributed power supply and the load are both connected with the microgrid bus (A); the microgrid controller is respectively connected with a microgrid bus (A), an energy storage module and a bidirectional inverter;
the microgrid controller is used for controlling the bidirectional inverter to work according to main circuit voltage and residual electric quantity, the main circuit voltage is the voltage of a microgrid bus (A), and the residual electric quantity is the real-time electric quantity of the energy storage module.
2. The locally stabilized microgrid of claim 1 wherein a microcontroller is used for monitoring the main circuit voltage and the remaining power in real time.
3. The local stability-maintaining microgrid of claim 1, wherein the microgrid controller is used for switching the bidirectional inverter to a charging state when the remaining power is lower than a preset power lower limit value and the main circuit voltage is normal; and the bidirectional inverter is also used for switching the bidirectional inverter to a discharging state when the residual electric quantity is greater than the electric quantity upper limit value and the main circuit voltage is lower than a preset voltage threshold interval.
4. The local stability-maintaining microgrid according to claim 3, wherein the microgrid controller is further connected with a load, and the microgrid controller is used for adjusting the working power of the load according to the power of the microgrid bus (A) when the main grid voltage is lower than a preset voltage threshold interval and the residual power is smaller than a power lower limit value.
5. The local dimensional stability type microgrid according to claim 3, wherein a power supply line and a voltage dividing line are connected in parallel between the distributed power source and the ac bus, and a resistance value of the voltage dividing line is greater than a resistance value of the power supply line; the microgrid controller is respectively connected with the power supply circuit and the voltage division circuit and is used for controlling the switching-on of the two circuits.
6. The locally-maintained microgrid of claim 5, wherein under normal conditions, a power supply line is conducted; the microgrid controller is used for controlling the voltage division line to be conducted when the main circuit voltage is higher than the voltage threshold interval.
7. The locally stabilized microgrid of claim 6, wherein a slide rheostat is connected in series on the voltage dividing line, and the microgrid controller is connected with the slide rheostat; the microgrid controller is used for controlling the sliding rheostat to slide according to the distance between the main circuit voltage and the voltage threshold interval.
8. The locally stabilized microgrid of claim 5 further comprising an alarm, wherein the microgrid controller is connected to the alarm, the microgrid controller is configured to control the alarm to alarm when the main voltage is above the voltage threshold interval.
9. The locally stabilized microgrid of claim 8 wherein the microgrid controller is further configured for controlling an alarm to alarm when the duration of the main circuit voltage falling below the voltage threshold interval reaches a preset time threshold.
10. The locally-maintained microgrid of claim 1, wherein the distributed power source comprises: the energy storage module adopts a storage battery and/or a super capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011091334.6A CN112350356A (en) | 2020-10-13 | 2020-10-13 | Local stability-maintaining type microgrid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011091334.6A CN112350356A (en) | 2020-10-13 | 2020-10-13 | Local stability-maintaining type microgrid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112350356A true CN112350356A (en) | 2021-02-09 |
Family
ID=74360708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011091334.6A Pending CN112350356A (en) | 2020-10-13 | 2020-10-13 | Local stability-maintaining type microgrid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112350356A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931238A (en) * | 2010-04-29 | 2010-12-29 | 浙江省电力试验研究院 | Master-slave strategy-based microgrid system coordination control method |
| CN103219726A (en) * | 2013-03-29 | 2013-07-24 | 浙江大学 | Microgrid topology structure based on energy storage |
| US20140297051A1 (en) * | 2013-03-26 | 2014-10-02 | Northeastern University | Energy resource-grid-load automatic control system of smart microgrid and control methods thereof |
| CN105515019A (en) * | 2016-01-19 | 2016-04-20 | 盾石磁能科技有限责任公司 | Method and system for increasing micro-grid operation reliability |
| CN106059061A (en) * | 2016-07-18 | 2016-10-26 | 杭州电子科技大学 | Frequency converter high voltage suppression method combining low voltage ride through support |
| CN111162550A (en) * | 2019-12-18 | 2020-05-15 | 安徽天尚清洁能源科技有限公司 | Micro-grid complementary power supply method through storage battery transition |
-
2020
- 2020-10-13 CN CN202011091334.6A patent/CN112350356A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931238A (en) * | 2010-04-29 | 2010-12-29 | 浙江省电力试验研究院 | Master-slave strategy-based microgrid system coordination control method |
| US20140297051A1 (en) * | 2013-03-26 | 2014-10-02 | Northeastern University | Energy resource-grid-load automatic control system of smart microgrid and control methods thereof |
| CN103219726A (en) * | 2013-03-29 | 2013-07-24 | 浙江大学 | Microgrid topology structure based on energy storage |
| CN105515019A (en) * | 2016-01-19 | 2016-04-20 | 盾石磁能科技有限责任公司 | Method and system for increasing micro-grid operation reliability |
| CN106059061A (en) * | 2016-07-18 | 2016-10-26 | 杭州电子科技大学 | Frequency converter high voltage suppression method combining low voltage ride through support |
| CN111162550A (en) * | 2019-12-18 | 2020-05-15 | 安徽天尚清洁能源科技有限公司 | Micro-grid complementary power supply method through storage battery transition |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102234703B1 (en) | Energy storage system and method for controlling thereof | |
| KR102234290B1 (en) | Energy storage system and controlling method the same | |
| CN102280924B (en) | Uninterrupted power supply system for relay protection device | |
| CN103972976A (en) | Electric energy supply system | |
| CN103733465A (en) | Charging device | |
| CN107980194A (en) | Redundancy residential power | |
| CN103078384A (en) | Uninterruptible power supply | |
| CN109888805A (en) | Protection system and method temporarily drops in frequency converter voltage | |
| JP2023534687A (en) | Battery assembly and energy storage system | |
| CN112086955A (en) | Multi-battery mutual backup direct current system for transformer substation and automatic control method thereof | |
| CN105375616A (en) | Distribution network feeder terminal unit power supply management system and method | |
| CN203071616U (en) | Intelligent high-frequency switch direct-current power supply | |
| CN214958763U (en) | Multi-cluster parallel energy storage system applied to high-voltage direct-current equipment | |
| CN113644704A (en) | Two-way battery charging and discharging constant current control and circulating current suppression device, power supply and method | |
| CN104471823A (en) | Charger for blocking standby power and method of controlling same | |
| CN102055203A (en) | Power supply device for intelligently adjusting power grid load peak and valley in communication base station | |
| CN104300605A (en) | Power circuit and control method thereof | |
| CN201893599U (en) | Variable-pitch backup power supply system of wind generating set | |
| CN112350356A (en) | Local stability-maintaining type microgrid | |
| CN202142875U (en) | ine-interactive DC to DC long-acting type redundancy electric power system | |
| CN203135491U (en) | Ups | |
| CN210123893U (en) | Voltage regulation system applied to power grid | |
| CN205986176U (en) | Direct current strutting arrangement | |
| CN110854879A (en) | Be applied to electric wire netting frequency modulation device of photovoltaic direct current side | |
| CN103944179A (en) | Power supply system for implementing communication system peak load shifting by utilizing lead-carbon batteries |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |