CN201290010Y - Cascade dynamic voltage recovery device - Google Patents
Cascade dynamic voltage recovery device Download PDFInfo
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- CN201290010Y CN201290010Y CNU2008201905383U CN200820190538U CN201290010Y CN 201290010 Y CN201290010 Y CN 201290010Y CN U2008201905383 U CNU2008201905383 U CN U2008201905383U CN 200820190538 U CN200820190538 U CN 200820190538U CN 201290010 Y CN201290010 Y CN 201290010Y
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Abstract
The utility model relates to a tandem-type dynamic voltage restorer which adopts a hybrid energy storage system of a super capacitor and a storage battery, and belongs to the technical field of electric power equipment. The dynamic voltage restorer comprises a charging device, a hybrid energy storage system, an inverter unit and a boost filtering unit, wherein, the charging device is used for charging the super capacitor and storage battery hybrid energy storage system; the hybrid energy storage system which comprises the super capacitor and the storage battery is used for storing DC mode electric energy; the inverter unit is used for outputting compensation voltage; and the boost filtering unit is used for connecting the dynamic voltage restorer to an electric power system. The dynamic voltage restorer provided by the utility model meets the power storage requirement on the direct current side of the restorer by using a hybrid energy storage module, so as to replace the traditional power storage mode, and meets the compensation requirement for the short-time voltage sag in the electric power system. Meanwhile, compared with the dynamic voltage restorer of the traditional power storage unit, the utility model has the advantages of better dynamic response, longer compensation time, higher performance-price ratio, and more environmental protection.
Description
Technical field
The utility model relates to a kind of series type dynamic voltage restorer that adopts ultracapacitor and accumulator hybrid energy-storing system, belongs to electrical equipment technical field.
Background technology
Voltage dip is meant the incident that the supply power voltage effective value descends suddenly at short notice, and the duration of this phenomenon mostly is 0.5～1.5s greatly in electrical network.Voltage dip has become the topmost power quality problem of the big industrial trade company of influence with interruption.And the number of times of voltage dip takes place often more than voltage interruption, and frequency is comparatively frequent owing to falling temporarily, so in general, it is huge falling the loss that brings temporarily.
At the harm of voltage dip, traditional improvement measure mainly contains:
(1) reduces the sensitivity of production equipment self to voltage dip.
(2) number of defects of minimizing electrical network.
(3) shorten the fault clearance time.
(4) influence that compensation arrangement suppresses or eliminate power quality problem is installed, traditional method has: install static compensation device (as TCR, TSC, SR) additional; Adopt uninterrupted power supply (ups) Unity; Stand-by generator etc. is installed.
Transient power quality problems such as these methods or the voltage dip that can not take place electrical network, fluctuation are carried out real-time compensation, or cost an arm and a leg and efficient low, exist many deficiencies in a word.
Dynamic electric voltage recovery device DVR is based on the customization electric device of modern power electronics technology, be the effective and the most economic present solution electric voltage dropping and the method for rising problem, its basic thought is to insert a dynamically controlled voltage source in subscriber's line, adopts suitable control method to make this voltage offset because any harmful effect that the electric power system disturbance causes load voltage.
Energy-storage units provides active power to load during voltage dip, must have certain energy storage and Power Exchange ability.Typical and potential energy storage device comprises: storage battery, ultracapacitor, flywheel energy storage and superconducting energy storage etc., this several method all has characteristics and deficiency separately.
The sharpest edges of storage battery are that cost is lower, use simple; But the energy conversion efficiency of storage battery is low, because the restriction of self charging and discharging currents, it can not provide bigger power, the powerful requirement of abrupt release in the time of can not satisfying DVR carry out voltage compensation on real-time; Simultaneously, the life of storage battery is shorter, the maintenance cost height, and adopt heavy metal or Acidity of Aikalinity raw material more, be unfavorable for environmental protection.
Ultracapacitor is a kind of emerging energy-storage travelling wave tube, and it is big to have power density, long service life, the characteristics of non-maintaining and environmental protection; Shortcoming is that monomer voltage is low, and form high voltage needs a plurality of capacitors in series, and energy density is relatively low, and the voltage compensation of short period can only be provided for DVR.
Flywheel energy storage system is generally formed main frame by flywheel and motor, frequency converter etc., forms subsidiary engine by vacuum pump, refrigerating plant etc.Flywheel energy storage has advantages such as the electric power input and output are quick, efficient is high, the life-span is long, but the allowable stress of flywheel bulk material makes the rising that rotating speed can not be unlimited, and the flywheel energy stored is restricted.Its energy storage efficiency is subjected to the restriction of bearing friction, and it is complicated to be used for the control system of stable and location flywheel.In addition, cooling technology, vacuum technique also have much room for improvement.Because of the high speed rotating of flywheel also brings a series of problems such as noise, vibration, safety problem.
The principle of superconducting energy storage technology (SMES) is to utilize the magnetic field that produces in the superconducting coil to come store electrical energy.SMES equipment most important component is superconducting coil, cooling bay refrigerating system, helium bucket and ancillary equipment.The advantage of SMES has, and efficient is very high, can reach 90%, and power output is big, easily forms high voltage.Shortcoming mainly is that refrigerating system has increased cost, in addition, its stability also merits attention, and it is all highstrung to the variation in temperature, current density and magnetic field, its magnetic field will be equal to or higher than 9T, and keeping so, high magnetic field also is a very large technology of difficulty.
Summary of the invention
The purpose of this utility model is to provide a kind of series type dynamic voltage restorer, with the energy storage requirement of a hybrid energy-storing module realization restorer DC side, to replace traditional energy storage mode.
The technical solution of the utility model is: a kind of series type dynamic voltage restorer is characterized in that: comprise the charging device that is used for ultracapacitor and accumulator hybrid energy-storing system are charged, be used to store direct current form electric energy the mixed energy storage system of forming by ultracapacitor and storage battery, be used to the filter unit that boosts exporting the inversion unit of bucking voltage and be used for dynamic electric voltage recovery device is inserted electric power system;
Mixed energy storage system is connected in parallel on the DC side of charging device and inversion unit, form by bank of super capacitors, batteries and two electronic switches that a plurality of monomer ultracapacitors are composed in series, wherein batteries is in parallel through an electronic switch with bank of super capacitors, in order to the discharge of control mixed energy storage system; Mixed energy storage system is connected in parallel on the DC side of inversion unit through another electronic switch.
Aforesaid series type dynamic voltage restorer, it is characterized in that: be used for charging device that ultracapacitor and accumulator hybrid energy-storing system are charged, comprise a single-phase rectification bridge of forming by four power diodes, filter and three electronic switches of forming by inductance and electric capacity, the electric capacity of filter is connected in parallel on the DC side of rectifier bridge, inductance in the filter is connected in the charging current loop, between electronic switch serial connection charge device and the energy-storage system, as charge initiation and excision switch, other two electronic switches are series at the positive pole of storage battery and ultracapacitor respectively, being used to control charging device charges to mixed energy storage system, and cooperate with two electronic switches of mixed energy storage system, realize selecting discharge.
Aforesaid series type dynamic voltage restorer is characterized in that: be used to export the inversion unit of bucking voltage, comprise a half-bridge converter of being made up of four switching tubes.
Aforesaid series type dynamic voltage restorer, it is characterized in that: the filter unit that boosts that is used for dynamic electric voltage recovery device is inserted electric power system, comprise a step-up transformer and an electric capacity and the filter that inductance is formed, in parallel after the output series inductance of inversion unit with electric capacity, the secondary of step-up transformer filter capacitor in parallel, former edge joint is gone into electric power system, is used to realize the recovery voltage function of dynamic electric voltage recovery device.
Operation principle of the present utility model: (1) is used for charging device that ultracapacitor and accumulator hybrid energy-storing system are charged, single-phase rectification bridge is used for the electric energy of the alternating current form that will obtain from system by not controlling the electric energy that rectification converts the direct current form to, and with of the DC side output of this electric energy from rectifier bridge, in order to charge to mixed energy storage system, the electric capacity of filter is used for the high-frequency harmonic composition of filtering output voltage, the inductance in the filter; (2) be used to export the inversion unit of bucking voltage, it is the electric energy that is used for obtaining the direct current form from mixed energy storage system, and according to the testing result of sample circuit to load voltage, offset of sinusoidal modulating pulse series duty ratio is controlled, and direct current energy is converted behind the electric energy of alternating current form to the interchange outlet side output from inverter bridge; (3) be used for series type dynamic voltage restorer is inserted the filter unit that boosts of electric power system, filter capacitor is used for the high-frequency harmonic composition of filtering inversion unit output voltage, and inductance is used to regulate filter effect.
The beneficial effects of the utility model are:
Response time is fast: the power density of ultracapacitor reaches 5kW/kg, can be on abrupt release goes out the kilo-ampere electric current.
Operating time is long: storage battery and ultracapacitor have stronger complementarity on technical performance.The energy density of storage battery is big, but power density is little, and efficiency for charge-discharge is low, and cycle life is short, and to the charge and discharge process sensitivity, the high-power adaptability that discharges and recharges and frequently discharge and recharge is not strong.Ultracapacitor is then opposite, and its power density is big, and the efficiency for charge-discharge height has extended cycle life, and is adapted to very much the high-power occasion that discharges and recharges with cycle charge-discharge.Ultracapacitor is mixed use with storage battery, makes storage battery energy density big and the ultracapacitor power density big, have extended cycle life etc. that characteristics combine, can improve hybrid accumulator power output capacity, reduce internal loss, increase discharge time.
The cost performance height: because storage battery and ultracapacitor belong to static energy storage device, thereby simple and reliable when mixing use, need not subsidiary engine equipment, operating cost is low, and maintenance cost is few.In the mixed energy storage system work, instantaneous large-current is mainly born by ultracapacitor, can effectively reduce the charging and discharging of accumulator cycle-index, prolongs the useful life of a whole set of energy-storage system; Can also dwindle the volume of energy storage device, the reliability of improving electric power system and economy.
In sum, the mixed energy storage system of being made up of ultracapacitor and storage battery has the incomparable advantage of other energy storage modes, adopts the dynamic electric voltage recovery device rapid dynamic response speed of this mixed energy storage system, stored energy capacitance is big, easy to maintenance, simple to operate, the cost performance height.
Description of drawings
Fig. 1, the main circuit diagram of the utility model embodiment.
Fig. 2, the charge-discharge circuit figure of the ultracapacitor of the utility model embodiment and accumulator hybrid energy-storing system.
Embodiment
Below in conjunction with drawings and Examples series type dynamic voltage restorer of the present utility model is described in detail.
The explanation of mark among Fig. 1: 1-system power supply, 2-system equiva lent impedance, 3-ultracapacitor (bank of super capacitors), 4-storage battery (batteries), 5-load.
The series type dynamic voltage restorer of the utility model embodiment, its main circuit diagram comprises as shown in Figure 1:
(1) is used for charging device that ultracapacitor 3 and storage battery 4 mixed energy storage systems are charged, comprise filter that a single-phase rectification bridge of being made up of four power diode D1-D4, one are made up of inductance L 1 and capacitor C 1 and three electronic switch K1, K2, K3, the capacitor C 1 of filter is connected in parallel on the DC side of rectifier bridge, inductance L 1 in the filter is connected in the charging current loop, between electronic switch K1 serial connection charge device and the energy-storage system, as charge initiation and excision switch; Electronic switch K2, K3 are series at the positive pole of storage battery 4 and ultracapacitor 3 respectively, are used to control charging device to mixed energy storage system charging and cooperates with electronic switch K4, K5, realize that selection discharges;
(2) be used to store the mixed energy storage system of forming by ultracapacitor 3 and storage battery 4 of direct current form electric energy, this mixed energy storage system is connected in parallel on the DC side of charging device and inversion unit, and the bank of super capacitors 3 that is composed in series by a plurality of monomer ultracapacitors, batteries 4, two electronic switch K4, K5 form.Wherein batteries 4 is in parallel through an electronic switch K4 with bank of super capacitors 3, in order to control main discharge power supply; Whole mixed energy storage system is connected in parallel on the DC side of inversion unit through electronic switch K5;
(3) be used to export the inversion unit of bucking voltage, comprise a half-bridge converter of forming by four switching tubes (TD1-TD4);
(4) be used for dynamic electric voltage recovery device is inserted the filter unit that boosts of electric power system, comprise a step-up transformer Tup and a capacitor C 2 and the filter that inductance L 2 is formed, in parallel behind the output series inductance L2 of inversion unit with capacitor C 2, the secondary of step-up transformer Tup filter capacitor C2 in parallel, former edge joint is gone into electric power system, is used to realize the recovery voltage function of dynamic electric voltage recovery device.
Below introduce the workflow of the utility model embodiment in detail, the charge-discharge circuit figure of the ultracapacitor of the utility model embodiment and accumulator hybrid energy-storing system as shown in Figure 2, the charge and discharge process of whole mixed energy storage system is divided into three parts: two energy-storage travelling wave tubes charge respectively, ultracapacitor 3 discharge, storage battery 4 discharges.
During system initialization, earlier by electronic switch K1, K2, K3 closure, by rectification filtering circuit to two energy-storage travelling wave tubes: ultracapacitor 3 charge respectively with storage battery 4, and when two energy-storage travelling wave tube terminal voltages reached rated value, K1, K2, K3 disconnected, the cut-out charge circuit;
Ultracapacitor 3 is in parallel with storage battery 4, the centre is connected by electronic switch K4, ultracapacitor 3 is connected in parallel on the inversion end, the centre has a starting switch K5 to connect, electronic switch K4 is controlled by two energy-storage travelling wave tube end pressure reduction, if accumulator voltage exceeds the ultracapacitor end and presses a certain limit value, electronic switch K4 closure.Normal condition electronic switch K4, K5 disconnect.When falling temporarily appears in system voltage, send enabling signal, the K5 closure, earlier to the inversion unit power supply, if the time of falling temporarily is shorter, the not obvious compensation effect that influences of ultracapacitor 3 end drops is then only powered by ultracapacitor 3 by ultracapacitor 3, and K4 keeps disconnecting.If it is longer to fall the time temporarily, or it is frequent to fall number of times temporarily, and ultracapacitor 3 end drops are more, can not realize that load 5 voltages recover fully, and then the K4 closure provides the inversion unit DC power supply by storage battery 4, simultaneously to ultracapacitor 3 chargings.Continue to continue if fall temporarily, storage battery 4 is not enough to provide recovery voltage, then sends stopping signal by the DVR main circuit, excision load 5.
Claims (4)
1, series type dynamic voltage restorer is characterized in that: comprise the charging device that is used for ultracapacitor and accumulator hybrid energy-storing system are charged, be used for storage of electrical energy the mixed energy storage system of forming by ultracapacitor and storage battery, be used to the filter unit that boosts exporting the inversion unit of bucking voltage and be used for dynamic electric voltage recovery device is inserted electric power system;
Mixed energy storage system is connected in parallel on the DC side of charging device and inversion unit, form by bank of super capacitors, batteries and two electronic switches that a plurality of monomer ultracapacitors are composed in series, wherein batteries is in parallel through an electronic switch with bank of super capacitors, in order to the discharge of control mixed energy storage system; Mixed energy storage system is connected in parallel on the DC side of inversion unit through another electronic switch.
2, series type dynamic voltage restorer according to claim 1, it is characterized in that: be used for charging device that ultracapacitor and accumulator hybrid energy-storing system are charged, comprise a single-phase rectification bridge of forming by four power diodes, filter and three electronic switches of forming by inductance and electric capacity, the electric capacity of filter is connected in parallel on the DC side of rectifier bridge, inductance in the filter is connected in the charging current loop, between electronic switch serial connection charge system and the energy-storage system, as charge initiation and excision switch, other two electronic switches are series at the positive pole of storage battery and ultracapacitor respectively, being used to control charging system charges to mixed energy storage system, and cooperate with two electronic switches of mixed energy storage system, realize selecting discharge.
3, series type dynamic voltage restorer according to claim 1 is characterized in that: be used to export the inversion unit of bucking voltage, comprise a half-bridge converter of being made up of four switching tubes.
4, series type dynamic voltage restorer according to claim 1, it is characterized in that: the filter unit that boosts that is used for dynamic electric voltage recovery device is inserted electric power system, comprise a step-up transformer and an electric capacity and the filter that inductance is formed, in parallel after the output series inductance of inversion unit with electric capacity, the secondary of step-up transformer filter capacitor in parallel, former edge joint is gone into electric power system, is used to realize the recovery voltage function of dynamic electric voltage recovery device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201905383U CN201290010Y (en) | 2008-08-28 | 2008-08-28 | Cascade dynamic voltage recovery device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201905383U CN201290010Y (en) | 2008-08-28 | 2008-08-28 | Cascade dynamic voltage recovery device |
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| CN201290010Y true CN201290010Y (en) | 2009-08-12 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237689A (en) * | 2010-05-03 | 2011-11-09 | 西门子公司 | System for interchanging electric energy between a battery and an electric grid and respective method and application |
| CN102780240A (en) * | 2011-12-19 | 2012-11-14 | 洛阳理工学院 | Hybrid electric storage device used for storing solar energy |
| CN109088111A (en) * | 2018-08-23 | 2018-12-25 | 广州创链科技有限公司 | A kind of new-energy automobile lithium battery and lead-acid battery hybrid control system and method |
| CN109874357A (en) * | 2016-10-17 | 2019-06-11 | 株式会社日立制作所 | Battery system |
| CN111641211A (en) * | 2020-06-12 | 2020-09-08 | 国网重庆市电力公司电力科学研究院 | Voltage sag joint compensation optimization method and device and readable storage medium |
| CN112448395A (en) * | 2020-11-18 | 2021-03-05 | 山西大学 | Hybrid energy storage power distribution network dynamic voltage restorer and operation mode thereof |
-
2008
- 2008-08-28 CN CNU2008201905383U patent/CN201290010Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237689A (en) * | 2010-05-03 | 2011-11-09 | 西门子公司 | System for interchanging electric energy between a battery and an electric grid and respective method and application |
| US8922056B2 (en) | 2010-05-03 | 2014-12-30 | Siemens Aktiengesellschaft | Power interchange system for interchanging electric energy between a battery and an electric grid, method for interchanging electric energy between a battery and an electric grid and application of the power interchange system |
| CN102780240A (en) * | 2011-12-19 | 2012-11-14 | 洛阳理工学院 | Hybrid electric storage device used for storing solar energy |
| CN109874357A (en) * | 2016-10-17 | 2019-06-11 | 株式会社日立制作所 | Battery system |
| CN109874357B (en) * | 2016-10-17 | 2023-01-13 | 日本汽车能源株式会社 | Battery system |
| CN109088111A (en) * | 2018-08-23 | 2018-12-25 | 广州创链科技有限公司 | A kind of new-energy automobile lithium battery and lead-acid battery hybrid control system and method |
| CN111641211A (en) * | 2020-06-12 | 2020-09-08 | 国网重庆市电力公司电力科学研究院 | Voltage sag joint compensation optimization method and device and readable storage medium |
| CN112448395A (en) * | 2020-11-18 | 2021-03-05 | 山西大学 | Hybrid energy storage power distribution network dynamic voltage restorer and operation mode thereof |
| CN112448395B (en) * | 2020-11-18 | 2022-05-27 | 山西大学 | Hybrid energy storage power distribution network dynamic voltage restorer and operation mode thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WUHAN NARI CO., LTD., STATE GRID ELECTRIC POWER RE Free format text: FORMER OWNER: WUHAN HIGH VOLTAGE RESEARCH INSTITUTE OF STATE GRID Effective date: 20100702 Owner name: STATE NETWORK ELECTRIC POWER RESEARCH INSTITUTE |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20100702 Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Co-patentee after: State Grid Electric Power Research Insititute Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Patentee before: Guowang Wuhan High Voltage Inst |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160629 Address after: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Patentee after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 143 Patentee before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Patentee before: State Grid Electric Power Research Insititute |
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| CX01 | Expiry of patent term |
Granted publication date: 20090812 |
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| CX01 | Expiry of patent term |