CN103545913B - The thermal power plant frequency converter low voltage ride through device of interchange, direct current input double copies - Google Patents
The thermal power plant frequency converter low voltage ride through device of interchange, direct current input double copies Download PDFInfo
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Abstract
The present invention relates to power system voltage automatic control technology field, be the thermal power plant frequency converter low voltage ride through device of interchange, direct current input double copies, low voltage ride through device is arranged between electrical network power distribution cabinet and frequency converter by the present invention; This low voltage ride through device comprises the first performance element, the second performance element, batteries, rectification circuit, booster circuit, output executing circuit and signal regulating panel; When there is Voltage Drop, signal regulating panel controls AC power by after the first performance element and rectifier circuit rectifies, or described batteries is by after the second performance element output dc voltage, then through booster circuit boosting, realize the compensation to electrical network by output executing circuit.The low voltage ride through device that the present invention proposes is safe and reliable, highly sensitive, can the crucial subsidiary engine of effective guarantee and fired power generating unit continuous and steady operation.
Description
Technical field
The present invention relates to power system voltage automatic control equipment, specifically relate to the thermal power plant frequency converter low voltage ride through device of interchange, direct current input double copies.
Background technology
Along with the development of power electronic technology, frequency converter is accurate with its speed governing, uses simple, protects the feature such as complete to be widely used in Controlling Auxiliaries in Power Plants speed-adjusting and control system.The application of frequency converter not only reduces the energy consumption of power plant, also improves the automaticity of equipment simultaneously.Due to the application of power electronic device, frequency converter is all with undervoltage tripping protection, and the fluctuation of line voltage often brings the out of service of frequency converter, thus the expansion caused the accident.
Thermal power plant happens occasionally the accident of the fired power generating unit chaser caused by system low-voltage fault.In this type of accident; power plant inside or external fault (thunderbolt, electric equipment short circuit, ground connection etc.); cause line voltage to fall in short-term, amplitude of falling more than 15%, the duration is shorter, the generation of this type of fault; originally exiting of subsidiary engine should not be caused; but because the frequency converter equipment of the crucial subsidiary engine of thermal power plant does not possess low-voltage function, trigger the under-voltage protection that subsidiary engine drags frequency converter, frequency converter locking exports; subsidiary engine is shut down, and finally causes the chaser of generating set.Unplanned chaser between this type of age at failure, affect power plant generating continuity and economy on the one hand, and cause power plants generating electricity device damage, can impact electric power system further on the other hand, aggravation system failure degree, has a strong impact on the safe and stable operation of electric power system.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of interchange realizing 0 voltage input and support, the thermal power plant frequency converter low voltage ride through device of direct current input double copies, the actual demand of thermal power plant's low voltage crossing can be met, have safe and reliable, highly sensitive, powerful self-checking function, the features such as wiring is simple, and can realize exchanging 380V and direct current 220V input double copies, extraneous interchange 380V inputs to the batteries of device inside, when the ac bus of traversing device break down and open circuit or Voltage Drop to lower than 20% time even completely power-off time, the direct voltage input that the electric energy that can be stored by batteries realizes the short time supports output, even if the depleted of energy of batteries, the direct current 220V that this device still can receive to be provided in power plant powers, and ensures that the voltage stabilization exported after its BOOST boosts is reliable, meets the power demands of institute's band frequency converter, and then ensure subsidiary engine and fired power generating unit continuous and steady operation, guarantee machine net safety.The present invention is realized by following proposal:
The thermal power plant frequency converter low voltage ride through device of interchange, direct current input double copies, its improvements are, are arranged on by described low voltage ride through device between electrical network power distribution cabinet and frequency converter;
Described low voltage ride through device comprises the first performance element, the second performance element, batteries, rectification circuit, booster circuit, output executing circuit and signal regulating panel;
Described signal regulating panel controls AC power and carries out rectification by described first performance element and described rectification circuit to drop-off voltage, or described batteries is by after described second performance element output dc voltage, boost through described booster circuit again, realize the compensation to electrical network by output executing circuit.
Wherein, described first performance element one end is connected with AC power, and the other end is connected with described rectification circuit, described booster circuit and described output executing circuit successively;
Described batteries one end is connected with DC power supply, after the other end is connected with described second performance element, then is connected with described booster circuit by diode.
Wherein, described low voltage ride through device comprises electric current for detecting low voltage ride through device inside and magnitude of voltage, prevents the self-protection function module of overcurrent or overvoltage.
Wherein, described self-protection function module comprises current sensor and voltage sensor;
The number of described current sensor is two, is separately positioned on input and the output of described booster circuit;
Described voltage sensor is arranged on the output of described booster circuit.
Wherein, described first performance element comprises the first circuit breaker, the first contactor, the second contactor, the first reactor, the first resistance and the second resistance;
Described first circuit breaker one end is connected with described AC power, and the other end is connected with described first contactor and described first reactor successively;
1st end of described second contactor and the 3rd end are connected described first resistance and the second resistance respectively, more in parallel with described first contactor.
Wherein, described second performance element comprises the 3rd contactor, the 3rd resistance, the first film electric capacity, the second thin-film capacitor, the 3rd metal film electric capacity, the 4th metal film electric capacity and five metals and belongs to membrane capacitance;
Described 3rd contactor one end is connected with described batteries, is connected again, and is connected with described booster circuit by diode after described 3rd resistance of other end series connection with the described current sensor being located at booster circuit input;
Described the first film Capacitance parallel connection is at described booster circuit input, and described second thin-film capacitor, the 3rd metal film electric capacity, the 4th metal film electric capacity and five metals belong to the output that membrane capacitance is connected in parallel on described booster circuit successively.
Wherein, output executing circuit comprises first group of diode, second group of diode and the 3rd group of diode, the first fuse, the second fuse, the 3rd fuse, the 4th fuse, the second circuit breaker and the 3rd circuit breaker;
Described first group of diode, second group of diode and the 3rd group of diode are formed by two diodes; Described first group of diode and second group of diode are series aiding connection structure, and are connected on on the positive and negative electrode of described booster circuit output respectively; With described first group of Diode series after two diodes in parallels of described 3rd group of diode, form two positive electrode bus; Two negative electrode bus are drawn from second group of diode output, mate with described two positive electrode bus, form two groups of buses, each bus exports after connecting respectively and accessing described second circuit breaker and the 3rd circuit breaker after the first fuse, the second fuse, the 3rd fuse and the 4th fuse.
Wherein, described batteries is furnished with storage battery on-line monitoring system, for monitoring storage battery running status; Described batteries and described storage battery on-line monitoring system are contained in same cabinet.
With immediate prior art ratio, the present invention has following excellent effect:
The present invention proposes a kind of 0 voltage that realizes and inputs the interchange 380V of support and thermal power plant's low voltage ride through device of direct current 220V input double copies, safe and reliable, highly sensitive, can the crucial subsidiary engine of effective guarantee and fired power generating unit continuous and steady operation, and can following function be realized:
(1) AC and DC input power double copies.The present invention can receive the power supply input exchanging 380V and direct current 220V simultaneously, and raise voltage to direct current 520V by BOOST boosting loop below, two-way power supply is for subsequent use each other, and priority can be arranged.Direct current 220V power supply directly accesses batteries in power plant, is normal work increase by one defence line of low voltage ride through device, can ensures the crucial subsidiary engine safe and stable operation of Power Plant more reliably.
(2) exchange when 380V input drops to 0% and still can export by assurance device DC voltage stability.In the present invention, after interchange 380V input unit, first the prime energy storage device be made up of batteries is entered, even if the effect of this energy storage battery group ensures that exchanging 380V power supply drops to 0% exactly, still ensure that the direct voltage of low voltage ride through device stable output supports by its electric energy stored.
(3) integrated accumulator internal resistance real time monitoring, the battery that Timeliness coverage performance falls behind also is reported to the police.The present invention is by Real-Time Monitoring accumulator internal resistance value in daily floating charge process, the fault of VRLA storage battery, as the increase of concentrated expression in accumulator internal resistance, the reductions of conductance such as grid corrosion and growth, loose contact, the minimizings of active material available quantity, therefore, the height of conductance or resistance can be used as the effective information characterizing accumulator failure and usage degree, and inner walkway method becomes the effective ways measuring accumulator property quality.
(4) Topology Structure Design of novelty.This device uses when low-voltage abnormal conditions appear in electrical network, the overwhelming majority time is standby, voltage counnter attack unit is added in topology, make its output 6 ~ 8V slightly lower than load DC both end voltage, like this when electrical network is normal, the power of frequency converter is supplied by ac bus, greatly can improve the useful life of device.
(5) perfect protection mechanism.This device its own band overcurrent, short circuit, lightning protection, surging prevention, have self-inspection, reset, emergent stopping, and energy is from releasing control unit function.There is running status, the indicating status such as malfunction.Greatly can improve overall performance and the security reliability of device.
Accompanying drawing explanation
Fig. 1 is field connection figure provided by the invention.In figure, VRT-380A is low voltage ride through device.
Fig. 2 is the structured flowchart of low voltage ride through device provided by the invention.
Fig. 3 is the inner connection layout of low voltage ride through device provided by the invention.In figure, SW1, SW2 and SW3 are circuit breaker; KM1, KM2 and KM3 are electromagnetic contactor; CR1, CR2 and CR3 are resistance; L1 is filter reactor; L2 is BOOST boost inductance; TBRG is three-phase commutation bridge; C1 and C2 is thin-film capacitor; C3, C4 and C5 are metal film electric capacity; CT1 and CT2 is two current sensors; D1, D2 and D3 are diode group; FU1, FU2, FU3 and FU4 are fuse.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.
The control objectives of the low voltage ride through device of the present embodiment is ensure that when system voltage falls the rotating speed of frequency converter and dragging motor system thereof, power, torque are constant.
Concrete, as shown in Figure 1, the low voltage ride through device of the present embodiment is between electrical network power distribution cabinet and frequency converter, and its structured flowchart as shown in Figure 2, specifically comprises the first performance element, the second performance element, batteries, rectification circuit, booster circuit, output executing circuit and signal regulating panel; When there is Voltage Drop, signal regulating panel controls AC power by after the first performance element and rectifier circuit rectifies, or described batteries is by after the second performance element output dc voltage, then through booster circuit boosting, realize the compensation to electrical network by output executing circuit.Corresponding, first performance element one end is connected with AC power, and the other end is connected with rectification circuit, booster circuit and output executing circuit successively; Batteries one end is connected with DC power supply, after the other end is connected with the second performance element, then is connected with booster circuit by diode.
Preferably, the low voltage ride through device of the present embodiment also can add self-protection function module, for detecting electric current and the magnitude of voltage of low voltage ride through device inside, prevents overcurrent or overvoltage.Self-protection function module comprises current sensor and voltage sensor.The number of current sensor is two, and be separately positioned on input and the output of booster circuit, voltage sensor is arranged on the output of booster circuit.
The inner connection layout of the low voltage ride through device of the present embodiment as shown in Figure 3, explanation specific as follows:
First performance element of the present embodiment comprises the first circuit breaker SW1, the first contactor KM1, the second contactor KM2, the first reactor L1, the first resistance CR1 and the second resistance CR2; First circuit breaker SW1 one end is connected with outside AC power, and the other end is connected with the first contactor KM1 and the first reactor L1 successively; 1st end of the second contactor KM2 is connected the first resistance CR1, and the 3rd end is connected after the second resistance CR2, more in parallel with the first contactor KM1.
Second performance element of the present embodiment comprises: the first film electric capacity C1, the second thin-film capacitor C2, the 3rd metal film electric capacity C3, the 4th metal film electric capacity C4 and five metals belong to membrane capacitance C5; 3rd contactor KM3 one end is connected with batteries, is connected again, and is connected with booster circuit by diode after other end series connection the 3rd resistance CR3 with the current sensor CT1 being located at booster circuit (being made up of insulated gate bipolar transistor IGBT) input; The first film electric capacity C1 is connected in parallel on booster circuit input, and the second thin-film capacitor C2, the 3rd metal film electric capacity C3, the 4th metal film electric capacity C4 and five metals belong to the output that membrane capacitance C5 is connected in parallel on booster circuit successively.
The batteries of the present embodiment is furnished with storage battery on-line monitoring system, for monitoring storage battery running status.Further, batteries and described storage battery on-line monitoring system are contained in same cabinet.
The output executing circuit of the present embodiment comprises first group of diode D1, second group of diode D2 and the 3rd group diode D3, the first fuse FU1, the second fuse FU2, the 3rd fuse FU3, the 4th fuse FU4, the second circuit breaker SW2 and the 3rd circuit breaker SW3; First group of diode D1, second group of diode D2 and the 3rd group diode D3 are formed by two diodes; First group of diode D1 and second group of diode D2 is series aiding connection structure, and is connected on on the positive and negative electrode of booster circuit output respectively; Connect with first group of diode D1 after two diodes in parallels of the 3rd group of diode D3, form two positive electrode bus; Two negative electrode bus are drawn from second group of diode D2 output, mate with two positive electrode bus, form two groups of buses, four buses, export after accessing the second circuit breaker SW2 and the 3rd circuit breaker SW3 after the first fuse FU1 that connects respectively, the second fuse FU2, the 3rd fuse FU3 and the 4th fuse FU4.
In sum, the idiographic flow of the low voltage ride through device of the present embodiment is:
Under the normal state of system voltage, normal and the frequency converter of frequency converter busbar voltage normally works, electric energy is by external communication power transmission, signal regulating panel (realization such as FPGA, single-chip microcomputer can be adopted) to circuit breaker, motor switch etc. first performance element send close a floodgate order, now DC loop is in servo condition, does not participate in frequency converter and runs.After first performance element performs, rectifier bridge TBRG carries out rectification and exports direct current, charge on the one hand thin-film capacitor C1, by boost inductance L2 and BOOST boosting loop direct current boosted on the other hand and send into frequency converter DC input terminal, meeting low voltage ride through device servo condition.
When system voltage falls, be instantly brought down below the rated voltage of requirement, device is instantaneous to put into operation.By boost inductance L2, BOOST boosting loop, the alternating voltage fallen is risen to 500V direct voltage, if there is open circuit or fall too low (during lower than normal value 20%) in alternating voltage during this period, device will access direct current 220V batteries for subsequent use automatically, 500V is risen to by boost inductance L2, BOOST boosting loop, by the DC bus of frequency converter to inverter supply, the voltage levvl making it be maintained to can to ensure that power converter output, motor torque, motor speed are all constant.Wherein, the second thin-film capacitor C2, the 3rd metal film electric capacity C3, the 4th metal film electric capacity C4 and five metals belong to membrane capacitance C5, for second level energy storage.
Fall end at system voltage, system voltage recover normal after, device is out of service, and deactivate state in boosting loop, return to servo condition, the power supply of frequency converter is still provided by three-phase alternating current power transmission loop.Wherein, this device uses when low-voltage abnormal conditions appear in electrical network, the overwhelming majority time is standby, voltage counnter attack unit is achieved by first group of diode D1, second group of diode D2 and the 3rd group diode D3 in topology, make its output 6 ~ 8V slightly lower than load DC both end voltage, like this when electrical network is normal, the power of frequency converter is supplied by ac bus, greatly can improve the useful life of device.Further, when occurring overcurrent, fuse FU1, FU2, FU3, FU4 carry out overcurrent protection, protect the fail safe of device.
In low voltage ride through device running, there will be four kinds of mode of operations: Auto-Sensing Mode, operational mode, fault mode, shutdown mode, concrete:
(1) Auto-Sensing Mode.In order to the reliable and stable operation of assurance device, device can perform following two kinds of self-test operations:
1) power-on self-test: when device powered on machine, A.C. contactor closed after, system will carry out power-on self-test.Power-on self-test is mainly for every controlling functions of control circuit board, and self-inspection time span was 6 seconds, if function normally will enter running status automatically, " running indicator " keeps lighting; If system has fault, then disconnect and exchange input contactor, " trouble light " on cabinet door lights and exports fault-signal simultaneously.
2) manual self-inspection: under servo mode of operation, press " self-inspection " button of lower cabinet body main entrance, device enters manual self-inspection state, time remaining 30 second.During this, device will automatically perform DC boosting operation, if reach expectation threshold voltage within the time of setting, represent that self-inspection is normal, device will exit boost operating mode, keep servo mode of operation; If self-inspection has fault, control is exchanged input contactor and disconnects by device, and " trouble light " lights and export fault-signal simultaneously.
(2) operational mode.
Device has two kinds of operating states in the operating mode: boosting operating state, servo operating state." boosting operating state " be finger device when electric network source falls, the interchange of input or direct voltage can be carried out BOOST boost operations by low voltage ride through device, export to frequency changer direct current bus galvanic current pressure, maintain frequency converter normally work; " servo operating state " refers to when electric network source is normal or when recovering normal from abnormality, low voltage ride through device does not export DC power supply for frequency converter, and electric energy is directly supplied to frequency converter by supply and AC bus in power plant and exchanges input.
(3) fault mode.
When fault mode refers to that low voltage ride through device breaks down, system enters a kind of pattern of self-protection automatically, is now exported by locking direct current, normally can not work have an impact to frequency converter.When device breaks down, system can perform following control logic instruction: block power device trigger impulse, jump major loop A.C. contactor, light trouble light, export fault-signal, system enters fault-alarming state.
Failure elimination has two kinds of modes:
1) if fix a breakdown, can eliminate malfunction by " reset button " on lower cabinet body, system automatically will access main circuit power in 5 seconds, and successively experience stopped status, self-inspection state, normal after again attempt entering servo operation pattern;
2) if fault is unmanned for getting involved after occurring, system can attempt entering servo mode of operation after 5 minutes, if fault is not got rid of, system can enter fault mode after 5 minutes again, if continuous 5 times all enter fault mode, system can stop trial entering servo mode of operation, keeps fault mode, until failture evacuation, malfunction can be eliminated by " reset button ".
(4) shutdown mode.Shutdown mode refers to that low voltage ride through device is in be stopped exporting, and no longer monitors, follows the trail of the state of electrical network and load condition.Following situation system can enter into stopped status:
1) without three-phase alternating-current supply or DC power supply input; When external three-phase input AC 380V power supply or the equal power down of direct current input 220V power supply, system judges not possess condition of work automatically, will enter into stopped status;
2) when powering on for the first time, a kind of state that system advances in self-inspection;
3), when pressing emergency button switch, low voltage ride through device can automatically perform and block power conversion unit pulse, jump A.C. contactor, and light halt indicator, system enters stopped status.
It should be noted that the low voltage ride through device of the present embodiment also has following two functions:
1, unit self-protection protection mechanism;
Device is configured with perfect defencive function, and protection range juxtaposition, does not have dead band, can guarantee system safety under various fault ' conditions.Wherein:
(1) device body protection;
Device body protection comprises IGBT module error protection, inner DC bus overvoltage protection, three-phase input ac power short-circuit protection, three-phase input ac power overvoltage protection, DC output power short-circuit protection; After device detects these emergencies, power conversion unit pulse will be blocked, disconnect A.C. contactor, and light trouble light, output fault-signal.
(2) system protection;
Device is provided with protection act definite value, and for systems axiol-ogy is to action outlet during emergency, disconnect A.C. contactor, light trouble light, shut down lamp, after fault clearance, device resumes operation automatically.
System protection function concrete configuration is: overpower protection, direct current overcurrent protection, DC over-voltage protection and AC undervoltage protection.
2, accumulator internal resistance real time monitoring function;
Because the effect of energy storage battery group is extremely important, therefore embodiment is integrated with the function of Real-Time Monitoring accumulator internal resistance value in daily floating charge process.The fault of VRLA storage battery, as the increase of concentrated expression in accumulator internal resistance, the reductions of conductance such as grid corrosion and growth, loose contact, the minimizings of active material available quantity, for VRLA storage battery, if internal resistance increases by more than 20% than fiducial value (mean value), accumulator property then can drop to the low level of a level.This value is also that IEEESTD suggestion takes corrective action the standard of (discharge test or replacing) immediately.Alarming value is then set as 20% according to this suggestion benchmark by IBEX1000.Accordingly, when VRLA battery capacity drops to below 80%, the degree of aging of storage battery is unpredictable, and simultaneously the speed of capacity attenuation can more and more block, and the increase of internal resistance value also can be more and more faster.Now just should change storage battery in time, to improve the reliability of battery system.
Small area analysis inner walkway method general principle be make transient DC small current by storage battery to be measured and series connection with it to ratio resistance, measure this small area analysis respectively and carry out contrasting the internal resistance obtaining storage battery at storage battery equivalent internal resistance and the ohmically consumes power of contrast.During this method test accumulator internal resistance, its anti-interference, repeatable accuracy, real-time and fail safe all reach the top standard in this field.
Finally should be noted that: only illustrate that technical scheme of the present invention is not intended to limit in conjunction with above-described embodiment.Those of ordinary skill in the field are to be understood that: those skilled in the art can modify to the specific embodiment of the present invention or equivalent replacement, but these amendments or change are all being applied among the claims awaited the reply.
Claims (7)
1. the thermal power plant frequency converter low voltage ride through device of interchange, direct current input double copies, is characterized in that, be arranged on by described low voltage ride through device between electrical network power distribution cabinet and frequency converter;
Described low voltage ride through device comprises the first performance element, the second performance element, batteries, rectification circuit, booster circuit, output executing circuit and signal regulating panel;
Described signal regulating panel controls AC power and carries out rectification by described first performance element and described rectification circuit to drop-off voltage, or described batteries is by after described second performance element output dc voltage, boost through described booster circuit again, realize the compensation to electrical network by output executing circuit;
Described second performance element comprises the 3rd contactor, the 3rd resistance, the first film electric capacity, the second thin-film capacitor, the 3rd metal film electric capacity, the 4th metal film electric capacity and five metals and belongs to membrane capacitance;
Described 3rd contactor one end is connected with described batteries, is connected again, and is connected with described booster circuit by diode after described 3rd resistance of other end series connection with the current sensor being located at booster circuit input;
Described the first film Capacitance parallel connection is at described booster circuit input, and described second thin-film capacitor, the 3rd metal film electric capacity, the 4th metal film electric capacity and five metals belong to the output that membrane capacitance is connected in parallel on described booster circuit successively.
2. low voltage ride through device as claimed in claim 1, it is characterized in that, described first performance element one end is connected with AC power, and the other end is connected with described rectification circuit, described booster circuit and described output executing circuit successively;
Described batteries one end is connected with DC power supply, after the other end is connected with described second performance element, then is connected with described booster circuit by diode.
3. low voltage ride through device as claimed in claim 1 or 2, is characterized in that, described low voltage ride through device comprises electric current for detecting low voltage ride through device inside and magnitude of voltage, prevents the self-protection function module of overcurrent or overvoltage.
4. low voltage ride through device as claimed in claim 3, it is characterized in that, described self-protection function module comprises current sensor and voltage sensor;
The number of described current sensor is two, is separately positioned on input and the output of described booster circuit;
Described voltage sensor is arranged on the output of described booster circuit.
5. low voltage ride through device as claimed in claim 4, it is characterized in that, described first performance element comprises the first circuit breaker, the first contactor, the second contactor, the first reactor, the first resistance and the second resistance;
Described first circuit breaker one end is connected with described AC power, and the other end is connected with described first contactor and described first reactor successively;
1st end of described second contactor and the 3rd end are connected described first resistance and the second resistance respectively, more in parallel with described first contactor.
6. low voltage ride through device as claimed in claim 1, it is characterized in that, output executing circuit comprises first group of diode, second group of diode and the 3rd group of diode, the first fuse, the second fuse, the 3rd fuse, the 4th fuse, the second circuit breaker and the 3rd circuit breaker;
Described first group of diode, second group of diode and the 3rd group of diode are formed by two diodes; Described first group of diode and second group of diode are series aiding connection structure, and are connected on on the positive and negative electrode of described booster circuit output respectively; With described first group of Diode series after two diodes in parallels of described 3rd group of diode, form two positive electrode bus; Two negative electrode bus are drawn from second group of diode output, mate with described two positive electrode bus, form two groups of buses, each bus exports after connecting respectively and accessing described second circuit breaker and the 3rd circuit breaker after the first fuse, the second fuse, the 3rd fuse and the 4th fuse.
7. low voltage ride through device as claimed in claim 1, it is characterized in that, described batteries is furnished with storage battery on-line monitoring system, for monitoring storage battery running status;
Described batteries and described storage battery on-line monitoring system are contained in same cabinet.
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|---|---|---|---|---|
| CN102593822A (en) * | 2012-01-18 | 2012-07-18 | 北京四方继保自动化股份有限公司 | Frequency converter dynamic voltage compensation device with low voltage ride through capability |
| CN103326385A (en) * | 2013-06-24 | 2013-09-25 | 大唐鸡西热电有限责任公司 | Pulverized coal feeder frequency converter control system with low voltage ride-through power supply device |
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2013
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593822A (en) * | 2012-01-18 | 2012-07-18 | 北京四方继保自动化股份有限公司 | Frequency converter dynamic voltage compensation device with low voltage ride through capability |
| CN103326385A (en) * | 2013-06-24 | 2013-09-25 | 大唐鸡西热电有限责任公司 | Pulverized coal feeder frequency converter control system with low voltage ride-through power supply device |
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| 胡坤等.火力发电辅机变频器低电压穿越装置实际应用.《电源技术应用》.2012,(第9期),第49-50页. * |
| 郑安等.给煤机变频器抗低压穿越装置的实践与应用.《全国火电600MW级机组能效对标及竞赛第十六届年会》.2012,第251-258页. * |
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| CN103545913A (en) | 2014-01-29 |
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