CN210490481U - Dynamic voltage restorer based on short-time high-frequency secondary flywheel energy storage system - Google Patents
Dynamic voltage restorer based on short-time high-frequency secondary flywheel energy storage system Download PDFInfo
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- CN210490481U CN210490481U CN201922013562.0U CN201922013562U CN210490481U CN 210490481 U CN210490481 U CN 210490481U CN 201922013562 U CN201922013562 U CN 201922013562U CN 210490481 U CN210490481 U CN 210490481U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The utility model discloses a developments voltage restorer based on short-term high frequency flywheel energy storage system, including the host computer cabinet, the flywheel energy storage system who is connected with the host computer cabinet electricity, the host computer cabinet be equipped with AC input switch, thyristor switch, AC output switch, isolation transformer and two-way conversion power module, AC input switch, thyristor switch and AC output switch series connection, the host computer cabinet is connected with the distribution transformer electricity of three-phase commercial power through AC input switch, the host computer cabinet is connected with the load end electricity through AC output switch, the host computer cabinet passes through isolation transformer, two-way conversion power module is connected with flywheel energy storage system electricity, flywheel energy storage system passes through two-way conversion power module, isolation transformer and AC output switch are connected with the load end electricity. The device can charge and discharge with high power, has high efficiency and no pollution, can discharge for 15s with full power of the monomer, has power density more than 3000W/kg, can deal with the occurrence of various voltage sag conditions, and has simple structure and low cost.
Description
Technical Field
The utility model relates to an electrical equipment is exactly a dynamic voltage restorer based on short-term high frequency time flywheel energy storage system.
Background
The online DVR currently on the market is mainly composed of a voltage source inverter, a bypass and a compensator transformer connected in series between the power supply grid and the load. Once the voltage deviates from the set value, the IGBT inverter is immediately controlled to add proper compensation voltage into the main loop through the compensation transformer connected in series, and the voltage at the output end is extremely quickly regulated to the set value, so that the influence of voltage sag at the output end of the power grid on a load is eliminated.
However, it has the following problems: 1. because the compensation energy is provided by the power grid, the deep voltage sag cannot be managed; 2. the secondary side of the compensation transformer is directly connected to a power grid, and the installation is difficult.
The parallel DVR using the super capacitor as the energy storage element has the advantages of less action times, small single voltage, multiple sections of single series-parallel connection in large capacity, large volume and the like, and brings a plurality of potential safety hazards to practical application. The typical value of the standby time of the super capacitor is 2s, and the super capacitor is larger in size and higher in investment cost when the standby time reaches about 10 s.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a dynamic voltage restorer based on flywheel energy storage system is time to short-term high frequency, can high-power charge-discharge, efficient, pollution-free, monomer full power discharge time reaches 15s, and power density is greater than 3000W kg, can deal with the emergence and the simple structure of multiple voltage sag condition, and the cost is less.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a dynamic voltage restorer based on a short-time high-frequency secondary flywheel energy storage system comprises a main cabinet and a flywheel energy storage system electrically connected with the main cabinet, wherein the main cabinet is provided with an alternating current input switch, a thyristor switch, an alternating current output switch, an isolation transformer and a bidirectional variable current power module, the alternating current input switch, the thyristor switch and the alternating current output switch are connected in series, the main cabinet is electrically connected with a distribution transformer of three-phase mains supply through the alternating current input switch, the main cabinet is electrically connected with a load end through the alternating current output switch, the main cabinet is electrically connected with the flywheel energy storage system through the isolation transformer and the bidirectional variable current power module, and the flywheel energy storage system is electrically connected with the load end through the bidirectional variable current power module, the isolation transformer and the alternating.
The working principle of the technical scheme is illustrated as follows:
the dynamic voltage restorer is connected in parallel to a main circuit of a power grid, the amplitude and the phase of the system side voltage and the load side voltage are detected on line through the control unit and compared with the reference voltage in real time, and the reference voltage is obtained by calculating according to voltage fluctuation caused by daily load change.
(1) When the power grid is normal, the equipment is in a power supply mode of the power grid voltage
When the voltage of the power grid is in a normal range, the DVR is in a standby state, the thyristor switch is controlled to be in a conducting state, the inverter does not work, the flywheel is in a highest rotating speed running state, and the output voltage is the voltage of the power grid.
(2) When abnormal conditions such as sag and the like occur in the power grid, the equipment is in a flywheel power supply mode
When the voltage of the power grid drops temporarily, the DVR immediately controls the thyristor switch to be in an off state, and the power grid voltage is completely separated from the load. Within 5ms, the flywheel discharges through the inverter and then through an isolation transformer, outputting a predetermined voltage to the load. The voltage support of the DVR thoroughly avoids the damage to the load due to voltage sags.
(3) When the power grid is recovered to be normal, the flywheel equipment is withdrawn, and the equipment is in a power grid voltage power supply mode
When the voltage of the power grid is recovered to a normal value, the DVR stops working, meanwhile, the thyristor switch is controlled to be in a conducting state, the output voltage is recovered to the voltage of the power grid, and the flywheel starts to charge to prepare for the next voltage sag.
Adopt above-mentioned technical scheme the utility model discloses, compare with prior art, its outstanding characteristics are:
(1) the response speed is high, the typical response time is 2ms, and the worst case response time is 5ms
The DVR series dynamic voltage restorer timely responds to abnormal conditions such as power grid sag and the like by monitoring the power grid condition in real time, and the monitoring response time is less than 100 us; and the power module continuously works in a grid-connected standby mode, when the power grid is abnormal, the power supply mode of the power grid voltage and the power supply mode of the energy storage power module can be quickly switched, so that the normal work of the electric equipment is not influenced by abnormal power grid conditions such as sag and the like.
(2) The full power design of the inverter supports the three-phase falling of 100 percent
The DVR series dynamic voltage restorer full series machine type power modules are designed to be full power, so that when a power grid is abnormal, the power supply mode of the energy storage power module can normally operate, and the power requirement of subsequent flywheel energy storage module capacity expansion is met; and the compensation requirement when the voltage of the power grid drops by 100% is supported, the compensation requirement is completely superior to the DL/T-1229 rated compensation requirement (the 7.8.2 rated compensation is preferably more than or equal to 50%), and the method is applicable to the worst power grid condition.
(3) The voltage adjustment target value can be set on site and is default to-15% to +15% when leaving factory
The DVR series dynamic voltage restorer fully considers different power grid fluctuation conditions possibly existing on the site, opens a voltage adjustment target value and supports site setting so as to adapt to actual site requirements of different customers.
(4) The magnetic suspension flywheel is used as an energy storage element, and the charging and discharging times reach 1000 ten thousand times
The DVR series dynamic voltage restorer is matched with a magnetic suspension flywheel as an energy storage element in a full series standard, and the charging and discharging times can reach 1000 ten thousand; the series-matched flywheel energy storage system is subjected to series planning and mainly comprises a control cabinet and a flywheel body, and the flywheel energy storage system can be connected in parallel to form a cabinet according to capacity and discharge time.
The further preferred technical scheme is as follows:
the main cabinet is provided with a maintenance bypass switch, and the maintenance bypass switch is connected with the thyristor switch in parallel.
Through setting up maintenance bypass switch, make things convenient for the maintenance of this device, and efficiency reaches more than 99% under the electron bypass operating condition, reduces the electric energy loss expense by a wide margin. The electronic bypass is controlled by a thyristor switch, and under the working state of the electronic bypass, the loss of the whole machine is the switching-on loss of the thyristor switch and the standby loss of the inverter, so that the efficiency can reach more than 99 percent, and the loss of electric energy can be greatly reduced.
The flywheel energy storage system is provided with a bidirectional flow converter and a flywheel, and the flywheel is electrically connected with the main cabinet through the bidirectional flow converter.
The bidirectional flow changer is arranged, so that the energy storage and the energy release of the flywheel can be guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
description of reference numerals: 1-a main cabinet; 2-flywheel energy storage system; 3-a flywheel; 4-a bi-directional streamer; 5-bidirectional variable flow power module; 6-isolation transformer; 7-a load end; 8-AC output switch; 9-thyristor switches; 10-maintenance bypass switch; 11-an alternating current input switch; 12-distribution transformer.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Referring to fig. 1, a dynamic voltage restorer based on a short-time high-frequency secondary flywheel 3 energy storage system 2 is composed of a main cabinet 1 and a flywheel 3 energy storage system 2 electrically connected with the main cabinet 1; the main cabinet 1 is provided with an alternating current input switch 11, a thyristor switch 9, an alternating current output switch 8, an isolation transformer 6 and a bidirectional variable power module 5, the alternating current input switch 11, the thyristor switch 9 and the alternating current output switch 8 are connected in series, the main cabinet 1 is electrically connected with a distribution transformer 12 of three-phase commercial power through the alternating current input switch 11, the main cabinet 1 is electrically connected with a load end 7 through the alternating current output switch 8, the main cabinet 1 is electrically connected with an energy storage system 2 of the flywheel 3 through the isolation transformer 6 and the bidirectional variable power module 5, and the energy storage system 2 of the flywheel 3 is electrically connected with the load end 7 through the bidirectional variable power module 5, the isolation transformer 6 and the alternating current output switch 11.
The working principle of the technical scheme is illustrated as follows:
the dynamic voltage restorer is connected in parallel to a main circuit of a power grid, the amplitude and the phase of the system side voltage and the load side voltage are detected on line through the control unit and compared with the reference voltage in real time, and the reference voltage is obtained by calculating according to voltage fluctuation caused by daily load change.
(1) When the power grid is normal, the equipment is in a power supply mode of the power grid voltage
When the voltage of the power grid is in a normal range, the DVR is in a standby state, the thyristor switch 9 is controlled to be in a conducting state, the inverter does not work, the flywheel 3 is in a highest rotating speed running state, and the output voltage is the voltage of the power grid.
(2) When abnormal conditions such as sag and the like occur in the power grid, the equipment is in a flywheel 3 power supply mode
When the voltage of the power grid drops temporarily, the DVR immediately controls the thyristor switch 9 to be in an off state, and the power grid voltage is completely separated from the load. Within 5ms, the flywheel 3 discharges through the inverter and then through an isolation transformer 6, outputting a predetermined voltage to the load. The voltage support of the DVR thoroughly avoids the damage to the load due to voltage sags.
(3) When the power grid is recovered to be normal, the flywheel 3 equipment is withdrawn, and the equipment is in a power grid voltage power supply mode
When the voltage of the power grid is recovered to a normal value, the DVR stops working, meanwhile, the thyristor switch 9 is controlled to be in a conducting state, the output voltage is recovered to the voltage of the power grid, and the flywheel 3 starts to charge to prepare for the next voltage sag.
The further preferred technical scheme is as follows:
the main cabinet 1 is provided with a maintenance bypass switch 10, and the maintenance bypass switch 10 is connected with the thyristor switch 9 in parallel.
Through setting up maintenance bypass switch 10, make things convenient for the maintenance of this device, and efficiency reaches more than 99% under the electron bypass operating condition, reduces the electric energy loss expense by a wide margin. The electronic bypass is controlled by a thyristor, and under the working state of the electronic bypass, the loss of the whole machine is the switching-on loss of the thyristor and the standby loss of the inverter, so that the efficiency can reach more than 99 percent, and the loss of electric energy can be greatly reduced.
The flywheel 3 energy storage system 2 is provided with a bidirectional flow converter 4 and a flywheel 3, and the flywheel 3 is electrically connected with the main cabinet 1 through the bidirectional flow converter 4.
The bidirectional flow changer 4 is arranged, so that energy storage and release of the flywheel 3 are guaranteed.
The advantages of this embodiment are:
(1) the response speed is high, the typical response time is 2ms, and the worst case response time is 5ms
The DVR series dynamic voltage restorer timely responds to abnormal conditions such as power grid sag and the like by monitoring the power grid condition in real time, and the monitoring response time is less than 100 us; and the power module continuously works in a grid-connected standby mode, when the power grid is abnormal, the power supply mode of the power grid voltage and the power supply mode of the energy storage power module can be quickly switched, so that the normal work of the electric equipment is not influenced by abnormal power grid conditions such as sag and the like.
(2) The full power design of the inverter supports the three-phase falling of 100 percent
The DVR series dynamic voltage restorer full series machine type power modules are designed to be full power, so that when a power grid is abnormal, the power supply mode of the energy storage power module can normally operate, and the power requirement of subsequent flywheel 3 energy storage module capacity expansion is met; and the compensation requirement when the voltage of the power grid drops by 100% is supported, the compensation requirement is completely superior to the DL/T-1229 rated compensation requirement (the 7.8.2 rated compensation is preferably more than or equal to 50%), and the method is applicable to the worst power grid condition.
(3) The voltage adjustment target value can be set on site and is default to-15% to +15% when leaving factory
The DVR series dynamic voltage restorer fully considers different power grid fluctuation conditions possibly existing on the site, opens a voltage adjustment target value and supports site setting so as to adapt to actual site requirements of different customers.
(4) The magnetic suspension flywheel 3 is used as an energy storage element, and the charging and discharging times reach 1000 ten thousand times
The DVR series dynamic voltage restorer is full series standard matching magnetic suspension flywheel 3 as energy storage element, the charging and discharging times can reach 1000 ten thousand; the flywheel 3 energy storage system 2 matched with the series is subjected to series planning and mainly comprises a control cabinet and a flywheel 3 body, and the flywheel 3 energy storage system 2 can be connected in parallel to form a cabinet according to the capacity and the discharge time.
The above description is only a preferred and practical embodiment of the present invention, and not intended to limit the scope of the present invention, and all structural equivalents made by using the contents of the specification and drawings are included in the scope of the present invention.
Claims (3)
1. The utility model provides a developments voltage restorer based on short-term high frequency time flywheel energy storage system, includes the host computer cabinet, the flywheel energy storage system who is connected with the host computer cabinet electricity, its characterized in that: the main cabinet is provided with an alternating current input switch, a thyristor switch, an alternating current output switch, an isolation transformer and a bidirectional variable current power module, the alternating current input switch, the thyristor switch and the alternating current output switch are connected in series, the main cabinet is electrically connected with a distribution transformer of three-phase commercial power through the alternating current input switch, the main cabinet is electrically connected with a load end through the alternating current output switch, the main cabinet is electrically connected with a flywheel energy storage system through the isolation transformer and the bidirectional variable current power module, and the flywheel energy storage system is electrically connected with the load end through the bidirectional variable current power module, the isolation transformer and the alternating current output switch.
2. The dynamic voltage restorer based on the short-time high-frequency secondary flywheel energy storage system according to claim 1, wherein: the main cabinet is provided with a maintenance bypass switch, and the maintenance bypass switch is connected with the thyristor switch in parallel.
3. The dynamic voltage restorer based on the short-time high-frequency secondary flywheel energy storage system according to claim 1, wherein: the flywheel energy storage system is provided with a bidirectional flow converter and a flywheel, and the flywheel is electrically connected with the main cabinet through the bidirectional flow converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922013562.0U CN210490481U (en) | 2019-11-20 | 2019-11-20 | Dynamic voltage restorer based on short-time high-frequency secondary flywheel energy storage system |
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| CN201922013562.0U CN210490481U (en) | 2019-11-20 | 2019-11-20 | Dynamic voltage restorer based on short-time high-frequency secondary flywheel energy storage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114172177A (en) * | 2021-11-24 | 2022-03-11 | 国网天津市电力公司 | Photovoltaic power station topology and method utilizing battery and inertial energy storage system |
| CN114243743A (en) * | 2022-02-28 | 2022-03-25 | 沈阳微控新能源技术有限公司 | Energy storage flywheel control device and network access system |
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2019
- 2019-11-20 CN CN201922013562.0U patent/CN210490481U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114172177A (en) * | 2021-11-24 | 2022-03-11 | 国网天津市电力公司 | Photovoltaic power station topology and method utilizing battery and inertial energy storage system |
| CN114243743A (en) * | 2022-02-28 | 2022-03-25 | 沈阳微控新能源技术有限公司 | Energy storage flywheel control device and network access system |
| CN114243743B (en) * | 2022-02-28 | 2022-05-20 | 沈阳微控新能源技术有限公司 | Energy storage flywheel control device and network access system |
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