CN102593822A - Frequency converter dynamic voltage compensation device with low voltage ride through capability - Google Patents
Frequency converter dynamic voltage compensation device with low voltage ride through capability Download PDFInfo
- Publication number
- CN102593822A CN102593822A CN2012100166313A CN201210016631A CN102593822A CN 102593822 A CN102593822 A CN 102593822A CN 2012100166313 A CN2012100166313 A CN 2012100166313A CN 201210016631 A CN201210016631 A CN 201210016631A CN 102593822 A CN102593822 A CN 102593822A
- Authority
- CN
- China
- Prior art keywords
- voltage
- phase
- circuit
- frequency converter
- compensation device
- 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
Landscapes
- Inverter Devices (AREA)
Abstract
The invention discloses a frequency converter dynamic voltage compensation device with low voltage ride through capability. The frequency converter dynamic voltage compensation device mainly consists of two parts, namely a dynamic voltage regulating circuit and a rectification circuit. The frequency converter dynamic voltage compensation device is connected between a power grid and a frequency converter in series, and the voltage of the power grid is converted into direct current voltage by the dynamic voltage regulating circuit and the rectification device and then is input into a direct current bus of the frequency converter. The frequency converter dynamic voltage compensation device utilizes a control manner of being standby usually and acting when alternating current voltage has failure and is dropped, that is a switch device of a voltage compensation device does not run when three-phase alternating current voltage is normal; and when the voltage of the power grid has failure and is dropped to a certain extent, the voltage compensation device starts, the dynamic voltage regulating circuit starts running, and the switch device runs to dynamically compensate the voltage of the power grid so that the alternating current voltage of the input side of the rectification circuit is stable; therefore, stable direct current output voltage of a rectification bridge is ensured, and a compensation device always outputs stable direct current voltage to ensure that a frequency converter does not stop when the voltage of a system is dropped and output rotation speed, torque and power of a driving motor are changeless.
Description
Technical field
The invention belongs to power supply and converter technology field, be specifically related to a kind of frequency converter dynamic voltage compensation device, be applicable to the various various load units that connect DC power supply that comprise frequency converter with low voltage ride-through capability.
Background technology
Frequency converter has been widely used in industrial system at present as a kind of high-precision automatic control equipment, in many important rotary load occasions, as in the power plant, all adopts the control mode of frequency converter dragging motor speed governing in a large number.For important load, it is extremely serious that the frequency converter that causes because of grid disturbance or short trouble is shut down the result who is caused, and sums up the fault type that occurs in the present actual motion, and the main cause that the most cases low-converter is shut down is an electric network electric voltage drop.
To its reason of above-mentioned situation analysis, frequency converter generally adopts the AC power input, after inner rectification, converts DC power supply into, and this DC power supply is carried out inversion to realize the control to motor.When frequency converter carried out inner inversion, inner DC bus-bar voltage need be maintained within a certain range, thereby low excessively DC bus-bar voltage can't guarantee that the normal operation of inversion can the internal trigger under-voltage protection.When line voltage breaks down voltage magnitude when falling; For frequency converter, the direct result that causes is that inner DC bus-bar voltage reduces, when DC bus-bar voltage is lower than the under-voltage protection value; To trigger the frequency converter protection; Cause frequency converter to shut down, thereby cause load to be shut down, production is caused have a strong impact on.To above-mentioned situation, need seek a kind of novel frequency-converter device, can cross over the system low-voltage falling process, lasting, the reliability service of proof load.
For overcoming the above problems; Current have through increasing the UPS electrical source of power for frequency converter or the method for the increase direct-flow storage battery support at frequency converter ac line place; Solve low-voltage halting problem; But in such scheme, all introduced storage battery, storage battery requires height, need regularly fill, put full problems such as operation, battery cost height entirely temperature and running environment, has restricted the extensive popularization of these two kinds of schemes.
Summary of the invention
For overcoming the above problem that exists in the prior art; The present invention proposes a kind of frequency converter dynamic voltage compensation device with low voltage ride-through capability; When being used to solve grid alternating current source voltage generation electric voltage dropping, situation such as frequency converter shutdown, trigger protection or operating state are unusual.The frequency converter dynamic voltage compensation device can for the frequency converter dragging system provides stable electrical source of power and control power supply, be kept continuous, reliable, the even running of dragging system when system voltage falls.
Concrete scheme of the present invention is following:
A kind of frequency converter dynamic voltage compensation device with low voltage ride-through capability; This frequency converter dynamic voltage compensation device is serially connected with between electrical network three-phase alternating-current supply and the frequency converter; Said frequency converter dynamic voltage compensation device comprises dynamic voltage adjustment circuit and rectification circuit, it is characterized in that:
Said dynamic voltage adjustment circuit is made up of the identical three phase dynamic regulating circuit of structure; Said three phase dynamic regulating circuit is made up of isolating transformer, single-phase full-wave rectifer circuit, dc bus support electric capacity, single-phase full bridge inverter circuit, output LC filter circuit respectively; Wherein the secondary winding of isolating transformer is connected to the interchange input side of single-phase full-wave rectifer circuit; Be connected to the input side of said single-phase full bridge inverter circuit behind the direct current outlet side parallel connection direct bus support electric capacity of said single-phase full-wave rectifer circuit; Outlet side one end of said single-phase full bridge inverter circuit is attached to the inductance of said output LC filter circuit; The other end of single-phase full bridge inverter circuit outlet side is attached to the electric capacity in the said output LC filter circuit, inductance and the capacitances in series of exporting in the LC filter circuit in the said output LC filter circuit;
Winding two ends, the former limit of isolating transformer in the said three phase dynamic regulating circuit are connected to electrical network three-phase alternating-current supply corresponding phase line and zero line respectively, and the electric capacity in the output LC filter circuit in the three phase dynamic regulating circuit then is serially connected in respectively in the corresponding phase circuit of three-phase alternating-current supply;
Said rectification circuit does not control rectifier bridge by three-phase and rectification circuit dc bus support electric capacity constitutes; Each phase circuit of said three-phase alternating-current supply is connected to the input that said three-phase is not controlled rectifier bridge after being connected in series in each phase dynamic voltage adjustment circuit the electric capacity of output LC filter circuit respectively, and three-phase is not controlled and connected the rectification circuit dc bus between output the two poles of the earth of rectifier bridge and support electric capacity.
The present invention has following beneficial effect:
Frequency converter dynamic voltage compensation device with low voltage ride-through capability according to the invention be applied to industrial frequency transformer drag fashionable; When line voltage falls, but the output voltage of dynamic adjustments compensation arrangement, through compensation to line voltage; Thereby make the DC bus-bar voltage of frequency converter in the normal range of operation of frequency converter; Thereby guarantee that in the whole process of electric network electric voltage drop frequency converter is not shut down frequency converter institute on-load operate as normal because of triggering the direct current under-voltage protection; When line voltage just often, the frequency converter dynamic voltage compensation device is in the stand-by operation pattern, does not influence frequency converter operation.
Description of drawings
Fig. 1 is the frequency converter dynamic voltage compensation device topological structure sketch map with low voltage ride-through capability;
Fig. 2 is a line voltage monitoring module subroutine flow chart;
Fig. 3 is a dynamic voltage adjustment circuit automatic control module main program flow chart;
Fig. 4 is integrated self-checking system program flow diagram.
Embodiment
Below according to Figure of description and combine specific embodiment to the further detailed presentations of technical scheme of the present invention.
Be illustrated in figure 1 as the structural representation with frequency converter dynamic voltage compensation device of low voltage ride-through capability of the present invention.
Embodiment 1: the frequency converter dynamic voltage compensation device is made up of two parts: dynamic voltage adjustment circuit 1, form by the three phase dynamic regulating circuit; Rectification circuit 2, three-phase be control rectifying circuit and dc bus support electric capacity composition not;
Each circuitry phase structure of three phase voltage regulating circuit, parameter are identical, and the three phase voltage regulating circuit is made up of isolating transformer, single-phase full-wave rectifer circuit, full bridge inverter, output LC filter circuit respectively.The former limit of isolating transformer in the said three phase voltage regulating circuit is connected to the corresponding phase line and the zero line of said three-phase alternating-current supply respectively, and said isolating transformer secondary is connected to said single-phase full-wave rectifer circuit.Said single-phase full-wave rectifer circuit exchanges input side and is attached to said isolating transformer secondary, and the direct current outlet side is attached to the connection place that said dc bus supports electric capacity and said single-phase full bridge inverter circuit.Said dc bus supports electric capacity one end and is attached to said single-phase full-wave rectifer circuit output cathode, and the other end is attached to said single-phase full-wave rectifer circuit output negative pole.Said single-phase full bridge inverter circuit is made up of four insulated gate bipolar transistor IGBTs, connecting mode be behind two strings again two also.Said single-phase full bridge inverter circuit input side one end is attached to the connection place that dc bus supports electric capacity and single-phase full-wave rectifer circuit output cathode, and the other end of said single-phase full bridge inverter circuit input side is attached to the connection place that dc bus supports electric capacity and single-phase full-wave rectifer circuit output negative pole; Outlet side one end of said single-phase full bridge inverter circuit is attached to inductance one end of said output LC filter circuit; The other end of said single-phase full bridge inverter circuit outlet side is attached to an end of electric capacity in the said output LC filter circuit, and the other end of the inductance in the LC filter circuit links to each other with the other end of electric capacity in the LC filter circuit.
Electric capacity in the output LC filter circuit in the said three phase dynamic regulating circuit then is serially connected in respectively in the corresponding phase circuit of three-phase alternating-current supply.In present embodiment 1, for example: the first dynamic voltage adjustment circuit is from the power taking of electric network source A phase, and the electric capacity in the output LC filter circuit seals in the electrical network three-phase alternating-current supply A phase circuit and carries out voltage compensation; And the second dynamic voltage adjustment circuit is from the power taking of electric network source B phase, and the electric capacity in the output LC filter circuit seals in and carries out voltage compensation in the electrical network three-phase alternating-current supply B phase circuit; And the 3rd dynamic voltage adjustment circuit is from the power taking of electric network source C phase, and the electric capacity in the output LC filter circuit seals in the electrical network three-phase alternating-current supply C phase circuit and carries out voltage compensation.
Said rectification circuit 2 does not control rectifier bridge by three-phase and dc bus support electric capacity constitutes; Convert the three-phase alternating current electric energy of three-phase alternating-current supply behind the electric capacity of output LC filter circuit of input into direct current energy; And the dc bus that outputs in the rectification circuit 2 supports electric capacity; This part adopts not control rectifying circuit of all-wave, does not control rectifier bridge and is made up of diode (led) module.Said three-phase alternating-current supply is connected to the input that said three-phase is not controlled rectifier bridge behind the electric capacity of output LC filter circuit, three-phase is not controlled and connected dc bus between output the two poles of the earth of rectifier bridge and support electric capacity.
Said frequency converter dynamic voltage compensation device at electrical network three-phase alternating-current supply voltage just often, the insulated gate bipolar transistor IGBT in the dynamic voltage adjustment circuit works in holding state, does not carry out switch control;
Said frequency converter dynamic voltage compensation device breaks down at electrical network; When three-phase alternating-current supply electric voltage dropping to predetermined control value is following; Switching device insulated gate bipolar transistor IGBT work in the dynamic voltage adjustment circuit; Line voltage is carried out dynamic compensation, make alternating voltage that said three-phase is not controlled the rectifier bridge input keep the output dc voltage that stable and three-phase is not controlled rectifier bridge to keep stable.
In embodiment 1; Each phase regulating circuit through isolating transformer from the electrical network power taking; And convert direct current into through single-phase full-wave rectifer circuit and support the electric capacity place at dc bus and carry out energy storage; Direct voltage converts alternating voltage into behind full bridge inverter, and carries out filtering through output LC filter circuit, and the electric capacity in the output LC filter circuit seals in electrical network and carries out voltage compensation.When line voltage just often; The insulated gate bipolar transistor IGBT of full bridge inverter is failure to actuate in each phase regulating circuit; Be that the dynamic voltage adjustment circuit does not compensate line voltage, when electrical network breaks down, when line voltage falls; Insulated gate bipolar transistor IGBT action in the regulating circuit; Through the control duty ratio be each phase regulating circuit output voltage of may command with compensation network voltage keep stable so that said three-phase is not controlled the input ac voltage of rectifier bridge, thereby guarantee that three-phase do not control the rectifier bridge output voltage stabilization.
This frequency converter dynamic voltage compensation device can provide one or more DC voltage-stabilizing electrical source of power; Promptly this converter power supply output can be many inverter supplies simultaneously; Its connected mode is: frequency converter dynamic voltage compensation device master power output P end connects diode anode, and this diode cathode is connected to the positive ends of direct-flow input end of frequency converter.Frequency converter dynamic voltage compensation device master power output N end connects another diode cathode, and this diode anode is connected to the negative terminal of direct-flow input end of frequency converter, and other each frequency converter connected mode is identical with aforesaid way.
In embodiment 1, the frequency converter dynamic voltage compensation device with low voltage ride-through capability can include only dynamic voltage adjustment circuit 1, rectification circuit 2 two parts.Network voltage detection electric circuit inspection line voltage state through the outside; Externally the network voltage detection electric circuit inspection to electric network electric voltage drop to controlling predetermined value when following; Control system controlling and driving dynamic voltage adjustment volt circuit 1 action through the outside; Carry out dynamic voltage adjustment control; Compensation network voltage is that frequency changer direct current bus voltage is stable to guarantee that three-phase is not controlled the rectifier bridge output voltage, thereby guarantees that the frequency converter dynamic voltage compensation device can be exported the galvanic current pressure in the whole low-voltage process of electrical network, thereby the assurance frequency converter is not shut down.
Embodiment 2: the frequency converter dynamic voltage compensation device that the application has a low voltage ride-through capability except comprise the dynamic voltage adjustment circuit 1 described in the embodiment 1, the rectification circuit 2; Also further comprise the secondary power supply output circuit 3 of uninterrupted power supply (ups) Unity and transformer, so that carry one or more ac control power supply.Said uninterrupted power supply UPS input is connected to the electrical network three-phase alternating-current supply, and its output is connected to transformer, and UPS obtains energy from electric power system, and internal battery is charged, and when system voltage fell, storage battery can guarantee that UPS exchanges output normally.Transformer can realize that the 220V interchange single-phase voltage that UPS is exported is transformed to 110V or 380V voltage is seen off.
Embodiment 3: in embodiment 3; The application's the frequency converter dynamic voltage compensation device with low voltage ride-through capability is except the part with embodiment 1 and/or 2; Can further include and be integrated in the inner control circuit 4 of frequency converter dynamic voltage compensation device, said control circuit 4 comprises signal acquisition module, line voltage monitoring module, dynamic voltage adjustment circuit automatic control module.Signal acquisition module is that the voltage and current signal that power circuit records is converted into the signal that line voltage monitoring module and dynamic voltage adjustment circuit automatic control module can receive.Line voltage is through signal acquisition circuit; Be connected to the line voltage monitoring module; Said line voltage monitoring module is gathered the electrical network three-phase voltage, through method of coordinates transform, calculates the positive sequence component of electric power system electrical network three-phase voltage vector in real time; And judge with voltage vector positive sequence component value whether electrical network three-phase alternating-current supply voltage drops to below the predetermined value, as the start-up criterion of dynamic voltage adjustment circuit;
The input ac voltage that line voltage, three-phase are not controlled rectifier bridge is sent to dynamic voltage adjustment circuit automatic control module through signal acquisition module; DC bus-bar voltage and direct current in each phase regulating circuit are sent to dynamic voltage adjustment circuit automatic control module after the signal acquisition module collection.The output of said dynamic voltage adjustment circuit automatic control module is connected to the grid of the insulated gate bipolar transistor IGBT of full bridge inverter in each phase regulating circuit respectively.After dynamic voltage adjustment circuit automatic control module receives voltage, current signal; Protect calculating to take place earlier fast to have judged whether fault; If fault-free takes place; When receiving enabling signal, will call turning on and off of insulated gate bipolar transistor IGBT in relevant each phase regulating circuit of control subprogram control; With compensation network voltage, it is stable to guarantee that three-phase is not controlled the rectifier bridge input ac voltage, thereby guarantees that it is that frequency changer direct current bus voltage is stable that three-phase is not controlled the DC bus-bar voltage of rectification output.Through above means, can guarantee when electrical network falls fault, but the frequency converter operate as normal, regulating circuit start-up time is less than 100us.
The control method of said frequency converter dynamic voltage compensation device is to carry out as follows:
The control method of line voltage monitoring module is as shown in Figure 2; In the time of in fact line voltage is sampled and calculate; Separate with positive-negative sequence through coordinate transform, calculate the positive sequence component of electrical network three-phase voltage vector in real time, and judge with voltage vector positive sequence component value whether electrical network three-phase alternating-current supply voltage drops to below the preset control value; And send the Regulation Control enabled instruction to control module
Step 1: gather line voltage, electric current, direct voltage, current data;
Step 2: image data is changed, be sent to dynamic voltage adjustment circuit automatic control module;
Step 3: the voltage data of gathering is carried out coordinate transform, extract positive sequence component;
Step 4: judge whether magnitude of voltage is lower than preset startup value, if be lower than preset startup value, then send enabling signal and returns step 1 to dynamic voltage adjustment circuit automatic control module, if be not less than preset startup value, then gets into step 5;
Step 5: judge whether magnitude of voltage returns to normally; If magnitude of voltage continues greater than the recovery value 100ms that sets; Then send and withdraw from signal, return step 1, if do not satisfy the recovery condition to dynamic voltage adjustment circuit automatic control module; Do not send and withdraw from signal, directly return step 1 to dynamic voltage adjustment circuit automatic control module.
Dynamic voltage adjustment circuit automatic control module calls the Regulation Control subprogram after receiving the enabling signal that the line voltage monitoring module sends.The control method of said automatic control module is as shown in Figure 3, and its step is following:
Step 1: line voltage, electric current, direct voltage, electric current to acquisition module transmits are protected calculating fast, get into step 2 as protection takes place, otherwise get into step 3;
Step 2: block IGBT pulse in the regulating circuit, remove the startup marker bit, be back to step 1;
Step 3:, call the Regulation Control program if be connected to enabling signal;
Step 4: call the bang-bang control program, guarantee in Regulation Control, it is bigger voltage overshoot to occur, and frequency changer direct current bus voltage withdraws from the pressure regulation automatic control module after surpassing the bang-bang limit value, if surpass bang-bang limit value, execution in step six; If do not surpass the bang-bang limit value, get into step 5;
Step 5: judge whether to receive and withdraw from signal,, get into step 6, otherwise return step 1 if receive;
Step 6: the envelope pulse, remove the startup marker bit, the Regulation Control module withdraws from;
Embodiment 4: on the basis of embodiment 3, the application have the frequency converter dynamic voltage compensation device of low voltage ride-through capability can also be in said automatic control module integrated self-checking system.
Integrated self-checking system in the said dynamic voltage adjustment circuit automatic control module; The startup self-detection system that is different from conventional meaning, said self-checking system is according to the time interval of setting, like 10 o'clock of every morning; Under the normal condition of electrical network three-phase voltage; The edge grid bipolar transistor IGBT of controlling in every phase pressure regulation branch road carries out switch motion, and the alternating voltage after will compensating is raised to a little more than normal alternating voltage level, judges whether operate as normal of insulated gate bipolar transistor IGBT, drive circuit and control module with this; So that in time arrange maintenance, this function is the characteristic that DC power supply such as storage battery does not possess.The control method of self-checking system is as shown in Figure 4, and its execution in step is following:
Whether step 1: judging current time, is 10 o'clock of the morning;
Step 2: judge whether the line voltage monitoring module exports enabling signal, if the output enabling signal after then delaying time 24 hours, starts self-check program again; Otherwise execution in step three;
Step 3: call the Regulation Control program, its control method is as shown in Figure 4;
Step 4: call the bang-bang control program, guarantee in Regulation Control, it is bigger voltage overshoot to occur, when frequency changer direct current bus voltage surpasses the bang-bang limit value, withdraws from the pressure regulation automatic control module; Otherwise continue execution in step four;
Step 5: after 2 seconds, judge whether self check is passed through; If satisfy 1.03Uacref＜Uac＜1.07Uacref, (at this moment, the Uac controlled target is 1.05pu) then is judged as self check and passes through; Otherwise self check is not passed through, and the user can check that the fault-signal that the controller protection is sent further carries out malfunction elimination and arranges maintenance;
Step 6: be back to step 1.
Among the present invention, the IGBT of dynamic voltage adjustment circuit part is in holding state when flat, and at three-phase system voltage just often promptly, the IGBT of dynamic voltage adjustment circuit does not carry out switch motion, and electric energy is sent into the frequency converter dc terminal through three-phase system, rectifier bridge, diode.Integrated line voltage monitoring module through method of coordinates transform, calculates the positive sequence component of electric power system three-phase voltage vector in real time in the device, and with voltage vector positive sequence component value as the startup of dynamic voltage adjustment circuit and withdraw from criterion.Integrated dynamic voltage adjustment circuit automatic control module in the device, according to the start and stop threshold value of the real-time output voltage values and the external setting-up of line voltage monitoring module, to the regulating circuit ring control that stagnates, reaction time start-stop time is less than 100us.The dynamic voltage adjustment link is the switch motion through control IGBT, and then starts the three phase dynamic regulating circuit and realize, but three phase dynamic regulating circuit assurance device output DC source voltage constant, and the operating voltage when its magnitude of voltage does not fall with system voltage is consistent.The influence that the frequency convertor system operating state that connected of device is not fallen by system voltage, its connect rotating speed of motor, torque, power and all remain unchanged.
The embodiment that more than provides is in order to explanation the present invention and its practical application; Be not that the present invention is done any pro forma restriction; Any one professional and technical personnel is in the scope that does not depart from technical scheme of the present invention, and above technology of foundation and method do certain modification and the equivalent embodiment that is regarded as equivalent variations is worked as in change.
Claims (8)
1. frequency converter dynamic voltage compensation device with low voltage ride-through capability, this voltage compensating device is serially connected with between electrical network three-phase alternating-current supply and the frequency converter, and said frequency converter dynamic voltage compensation device comprises dynamic voltage adjustment circuit and rectification circuit; It is characterized in that:
Said dynamic voltage adjustment circuit is made up of the identical three phase dynamic regulating circuit of structure; Said three phase dynamic regulating circuit is made up of isolating transformer, single-phase full-wave rectifer circuit, dc bus support electric capacity, single-phase full bridge inverter circuit, output LC filter circuit respectively; Wherein the secondary winding of isolating transformer is connected to the interchange input side of single-phase full-wave rectifer circuit; Be connected to the input side of said single-phase full bridge inverter circuit behind the direct current outlet side parallel connection direct bus support electric capacity of said single-phase full-wave rectifer circuit; Outlet side one end of said single-phase full bridge inverter circuit is attached to the inductance of said output LC filter circuit; The other end of single-phase full bridge inverter circuit outlet side is attached to the electric capacity in the said output LC filter circuit, inductance and the capacitances in series of exporting in the LC filter circuit in the said output LC filter circuit;
Winding two ends, the former limit of isolating transformer in the said three phase dynamic regulating circuit are connected to phase line and zero line corresponding in the electrical network three-phase alternating-current supply respectively, and the electric capacity in the output LC filter circuit in the three phase dynamic regulating circuit then is serially connected in respectively in the corresponding phase circuit of three-phase alternating-current supply;
Said rectification circuit does not control rectifier bridge by three-phase and rectification circuit dc bus support electric capacity constitutes; Each phase circuit of said three-phase alternating-current supply is connected to the input that said three-phase is not controlled rectifier bridge after being connected in series in each phase dynamic voltage adjustment circuit the electric capacity of output LC filter circuit respectively, and three-phase is not controlled and connected the rectification circuit dc bus between output the two poles of the earth of rectifier bridge and support electric capacity.
2. the frequency converter dynamic voltage compensation device with low voltage ride-through capability according to claim 1 is characterized in that:
Said single-phase full bridge inverter circuit is made up of four insulated gate bipolar transistor IGBTs, and connecting mode is: form two series arms by two insulated gate bipolar transistor IGBTs respectively, two series arms are connected in parallel.
3. the frequency converter dynamic voltage compensation device with low voltage ride-through capability according to claim 2 is characterized in that:
Said frequency converter dynamic voltage compensation device at electrical network three-phase alternating-current supply voltage just often, the insulated gate bipolar transistor IGBT in the three phase dynamic regulating circuit works in holding state, does not carry out switch control;
Said frequency converter dynamic voltage compensation device breaks down at electrical network; When three-phase alternating-current supply electric voltage dropping to predetermined control value is following; Switching device insulated gate bipolar transistor IGBT work in the three phase dynamic regulating circuit; Line voltage is carried out dynamic compensation, make alternating voltage that said three-phase is not controlled the rectifier bridge input keep the output dc voltage that stable and three-phase is not controlled rectifier bridge to keep stable.
4. the frequency converter dynamic voltage compensation device with low voltage ride-through capability according to claim 3 is characterized in that:
This frequency converter dynamic voltage compensation device can provide one or more DC voltage-stabilizing electrical source of power.
5. the frequency converter dynamic voltage compensation device with low voltage ride-through capability according to claim 1 and 2 is characterized in that:
Said frequency converter dynamic voltage compensation device also further comprises uninterrupted power supply UPS and transformer; Said uninterrupted power supply UPS input is connected to the electrical network three-phase alternating-current supply; Its output is connected to transformer; The alternating voltage of uninterrupted power supply UPS output is carried out conversion, and one or more is provided is 220V and/or 380V and/or 110V AC voltage-stabilizing control power supply.
6. according to claim 2 or 3 described frequency converter dynamic voltage compensation devices, it is characterized in that with low voltage ride-through capability:
The inner also integrated line voltage monitoring module of said frequency converter dynamic voltage compensation device; Gather the electrical network three-phase voltage; Pass through method of coordinates transform; Calculate in real time the positive sequence component of electrical network three-phase voltage vector, and judge electrical network three-phase alternating-current supply voltage status, as the startup of regulating circuit or withdraw from criterion with voltage vector positive sequence component value.
7. the frequency converter dynamic voltage compensation device with low voltage ride-through capability according to claim 6 is characterized in that:
The also further integrated dynamic voltage adjustment circuit automatic control module of said frequency converter dynamic voltage compensation device; The input of this automatic control module is connected to the output of said line voltage monitoring module; The output of said automatic control module is connected to the grid of the insulated gate bipolar transistor IGBT in the three phase dynamic regulating circuit respectively; To the ring self-starting control that stagnates of three phase dynamic regulating circuit, the self-starting time is less than 100us.
8. the frequency converter dynamic voltage compensation device with low voltage ride-through capability according to claim 7 is characterized in that:
Said frequency converter dynamic voltage compensation device can also be in said dynamic voltage adjustment circuit automatic control module further integrated self-checking system; Self-checking system is according to the time interval of setting; Under the normal condition of electrical network three-phase voltage; The edge grid bipolar transistor IGBT of controlling in every phase full bridge inverter carries out switch motion; And the output voltage of frequency converter dynamic voltage compensation device is raised to the voltage levvl a little more than normal rectification output, judge with this whether insulated gate bipolar transistor IGBT and drive circuit thereof can operate as normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100166313A CN102593822A (en) | 2012-01-18 | 2012-01-18 | Frequency converter dynamic voltage compensation device with low voltage ride through capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100166313A CN102593822A (en) | 2012-01-18 | 2012-01-18 | Frequency converter dynamic voltage compensation device with low voltage ride through capability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102593822A true CN102593822A (en) | 2012-07-18 |
Family
ID=46482151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100166313A Pending CN102593822A (en) | 2012-01-18 | 2012-01-18 | Frequency converter dynamic voltage compensation device with low voltage ride through capability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102593822A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545913A (en) * | 2013-10-25 | 2014-01-29 | 国家电网公司 | Thermal power plant frequency converter low voltage ride through device with alternating-current input backup and direct-current input backup |
| CN105334412A (en) * | 2015-10-13 | 2016-02-17 | 国网安徽省电力公司 | Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator |
| CN106020308A (en) * | 2016-07-05 | 2016-10-12 | 国网天津市电力公司 | Method for improving low voltage ride-through capability of coal feeder |
| CN106099948A (en) * | 2016-08-30 | 2016-11-09 | 国网河南省电力公司电力科学研究院 | A kind of power electronics is flexible coupling switch topology and control method thereof |
| CN107394787A (en) * | 2017-08-11 | 2017-11-24 | 浙江大学 | A kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit |
| CN113991734A (en) * | 2021-10-26 | 2022-01-28 | 中国华能集团清洁能源技术研究院有限公司 | Double-fed wind turbine generator control system and method with high voltage ride through capability |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201365126Y (en) * | 2009-03-02 | 2009-12-16 | 南京航空航天大学 | 400 Hz dynamic voltage compensation device |
| CN101969201A (en) * | 2010-09-17 | 2011-02-09 | 北京三得普华科技有限责任公司 | Dynamic voltage stabilizer for assisting wind driven generator in realizing low voltage ride through (LVRT) |
| CN202076805U (en) * | 2011-06-13 | 2011-12-14 | 思源清能电气电子有限公司 | Compensating device for assisting wind generating set with low voltage ride through |
| CN102299644A (en) * | 2011-08-23 | 2011-12-28 | 东北电网有限公司 | Frequency-converter stabilized power supply apparatus possessing low voltage ride-through (LVRT) capability |
-
2012
- 2012-01-18 CN CN2012100166313A patent/CN102593822A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201365126Y (en) * | 2009-03-02 | 2009-12-16 | 南京航空航天大学 | 400 Hz dynamic voltage compensation device |
| CN101969201A (en) * | 2010-09-17 | 2011-02-09 | 北京三得普华科技有限责任公司 | Dynamic voltage stabilizer for assisting wind driven generator in realizing low voltage ride through (LVRT) |
| CN202076805U (en) * | 2011-06-13 | 2011-12-14 | 思源清能电气电子有限公司 | Compensating device for assisting wind generating set with low voltage ride through |
| CN102299644A (en) * | 2011-08-23 | 2011-12-28 | 东北电网有限公司 | Frequency-converter stabilized power supply apparatus possessing low voltage ride-through (LVRT) capability |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545913A (en) * | 2013-10-25 | 2014-01-29 | 国家电网公司 | Thermal power plant frequency converter low voltage ride through device with alternating-current input backup and direct-current input backup |
| CN103545913B (en) * | 2013-10-25 | 2016-04-20 | 国家电网公司 | The thermal power plant frequency converter low voltage ride through device of interchange, direct current input double copies |
| CN105334412A (en) * | 2015-10-13 | 2016-02-17 | 国网安徽省电力公司 | Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator |
| CN106020308A (en) * | 2016-07-05 | 2016-10-12 | 国网天津市电力公司 | Method for improving low voltage ride-through capability of coal feeder |
| CN106099948A (en) * | 2016-08-30 | 2016-11-09 | 国网河南省电力公司电力科学研究院 | A kind of power electronics is flexible coupling switch topology and control method thereof |
| CN106099948B (en) * | 2016-08-30 | 2018-04-03 | 国网河南省电力公司电力科学研究院 | A kind of power electronics is flexible coupling switch topology and its control method |
| CN107394787A (en) * | 2017-08-11 | 2017-11-24 | 浙江大学 | A kind of distribution network voltage based on low pressure trend string reinforcing method falls compensation circuit |
| CN113991734A (en) * | 2021-10-26 | 2022-01-28 | 中国华能集团清洁能源技术研究院有限公司 | Double-fed wind turbine generator control system and method with high voltage ride through capability |
| CN113991734B (en) * | 2021-10-26 | 2023-09-01 | 中国华能集团清洁能源技术研究院有限公司 | Doubly-fed wind turbine generator control system and method with high voltage ride through capability |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102291085B (en) | Asynchronous motor frequency converter device with low-voltage ride through capability | |
| CN104184151B (en) | A kind of dynamic electric voltage recovery device realizing the different operational mode of microgrid and take over seamlessly | |
| CN102593822A (en) | Frequency converter dynamic voltage compensation device with low voltage ride through capability | |
| CN102751776B (en) | High-capacity reversible charging and discharging device | |
| CN103227477A (en) | High voltage ride through control method for double-fed wind generator | |
| CN100382404C (en) | Comprehensive dynamic compensating device for distribution network | |
| CN102299644A (en) | Frequency-converter stabilized power supply apparatus possessing low voltage ride-through (LVRT) capability | |
| CN104779695B (en) | The uninterrupted high frequency switch power of high energy efficiency in ATM | |
| CN105743374A (en) | Topological structure and control method optimized low-voltage ride through power supply apparatus used for frequency converter | |
| CN109888805A (en) | Protection system and method temporarily drops in frequency converter voltage | |
| CN201829966U (en) | Photovoltaic wind-driven grid-connected generating system with discontinuous power supply function | |
| CN102545646B (en) | Abnormal voltage ride-through power supply of frequency converter | |
| Montero-Hernandez et al. | Ride-through for critical loads. Exploring a low-cost approach to maintaining continuous connections between buildings and/or industrial systems | |
| CN105591533A (en) | PWM convertor circuit and frequency converter comprising same | |
| CN116404679A (en) | Micro-grid compensation device and micro-grid compensation method | |
| US20220407316A1 (en) | Flexible excitation system and control method therefor | |
| CN116316556A (en) | Low-penetration control method for direct-current hair storage system | |
| CN203039338U (en) | A complementary energy acquiring circuit | |
| CN109830989A (en) | One kind three-phase voltage phase sequence of micro-capacitance sensor containing new energy detects automatically and combination method | |
| CN112054590B (en) | Capacitor direct-current guarantee power supply | |
| CN205725557U (en) | A kind of feeder reactance voltage disturbance power-supply system | |
| CN104410346B (en) | AC (alternating current) supply anomaly preventive variable frequency driving unit | |
| CN114336647A (en) | Bidirectional charging device of dynamic voltage restorer and control method thereof | |
| CN204012747U (en) | A kind of little micro-Hydropower Unit and composite control apparatus thereof | |
| CN209979769U (en) | Collection terminal is equipped with electric patch box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120718 |