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Domestic high-voltage converter applications in power plants condensate pump by ferujkll sdff
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Domestic high-voltage converter applications in power plants condensate pump by FERUJKLL SDFF
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| Article Posted: 06/27/2011 |
| Article Views: 102 |
| Articles Written: 2023 - MORE ARTICLES FROM THIS AUTHOR |
| Word Count: 1176 |
| Article Votes: 0 |
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Domestic high-voltage converter applications in power plants condensate pump |
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Business,Business News,Business Opportunities
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1 Introduction China Datang Corporation Douhe Power Plant situated inside Tangshan, Hebei Province, now has eight cells within whole documented scope for of 1550MW of unravelling units, within 2004 I decided within the direction of Douhe Power Group, onto the percentage of the propel vitality Gaojing dash provides with tall voltage inverter, the company's international public tendering tall voltage inverter. Eastern Hitachi (Chengdu) Electric Control Equipment Co., Ltd. is the merely successful unit, and one successful six stations of tall voltage inverter. One Douhe Power # 5, # 6, # 7, # 8, 4 groups of Condensate Pump Units Motor Installation of a refurbished of the East, respectively, Hitachi (Chengdu) Electric Control Equipment Co., Ltd. demonstration DFCVERT-MV375/6B tall voltage inverter device.
2 Condensate Pump driving too fast situations Done inside the energy of the steam inside the steam turbine condenser cooling within the condensation, the engrossment within the water wells, otherwise the role of condensate pump is dispatched inside the direction of the condensed water deaerator inside a timely manner. Condensate pumps inside the direction of uphold ceaseless and unwavering crusade is inside the direction of hold energy vegetation safety, an respected facet of commercial production. Monitor, adapt the water degree internal the condenser is condensed water pump speeding a chief work. Under normal operating conditions, the water degree inside the condenser can not be too tall or too low. When the unit adversity increases, the condensation of water increased, the counterpart boost within water degree inside the condenser. When the unit trouble decreases, the condenser water stratum decreases. # 5, # 6, # 7, # eight Generator Unit (200MW) condensation pump motor as 6kV/300kW raise scheme has a sure margin, each unit is geared with couple sets of thickening pump, a run, a backup.
Converter is not qualified until the water horizontally within the condenser is tweaked via impressing the sell overseas of condensate impel Valve The obstacle for, and acclimatise the linearity is poor, a things of vitality sacrifice within the valve. At the fitting moment as often operate on the valve, effecting inside reduced reliability of the valve, instilling the strict endeavour of engendering units.
Using big impel transducer, the condensate pump convey out valve rudimentally do not losses towards convert the valve gate towards safeguard within a swelled extent, by redeveloping the inverter's goods frequency towards distort the propel speed, inside the direction of normalise sell wares The emphasise of traffic, encounter the qualifications of operating conditions.
3 DFCVERT-MV375/6B morals and scientific characteristics
3.1 DFCVERT-MV375/6B wish Frequency converter technical assets including multi-level cascading, 6kV procedure architecture manoeuvered inside Figure 1, the phase-shifting transformer, vitality unit and controller. 6kV sequence of 18 vitality units, each of six energy unit inside sequence pattern a phase.
Each vitality unit, and electrical propelled properties of urgently the same, interchangeable, the circuit guided in Figure 2, for the rudimentary AC - DC - AC single-phase inverter circuit, rectifier three-phase full-bridge diode, through the sinusoidal PWM IGBT inverter towards composure the waveform elicited as ready in Figure 3. Phase shifting transformer input edge of the vitality deliver towards each unit, phase-shifting transformer spinning is separated into three communities of little edge towards form 36-pulse rectifier; This multi-phase superposition mechanism can tremendously replace the world wide web of rectifier side rehearse waveform, in the direction of weight the network side of the energy ingredient shut towards 1.
Output side by each unit of U, V goods terminals roped in sequence with each extra into a celebrity bridge right away in the direction of the big voltage energy supply, through the PWM waveform of each unit reorganization, receive stepped sinusoidal PWM waveform. This justification in time is sweet sine wave, dv / dt is small, can dampen Cable And engine insulation damage, no one one goods filter can incur the end merchandise rotated cords gap is long, the raise does not require diminishing the assignment of use, can be exercised for the conversion of aged equipment; the suiting time, the engine harmonic losses mainly reduced, eradicating the resulting technical vibration, dampened Bearing And escapes the technical stress.
3.2 Main methodical facets (1) input harmonic DFCVERT-MV375/6B converter utilising a "multi-phase rectifier of engineering and unit-level series loading technology", line GB/T14549-2002 and IEEE519-1992 voltage and custom harmonic distortion of stringent requirements. The engineering than the "three-level technology", "current impose inverter technology", "string grin operated technology" and additional scientific software possess broad technological advantages, limited input and products catalogues of top harmonics upwards than the overhead techniques. When exercising the same power-line energy converter towards then electric-powered tool does not generate harmonic interference. Can deter otherwise frequency peace gizmos between the "Series and Parallel interference." Therefore not key for users in the direction of configure other harmonic instruction equipment, thereby retaining users the charge of setting upwards of harmonic filtering.
(2) tall vitality percentage DFCVERT-MV375/6B frequency converter can be upheld during the modification variation of high energy factor, the benchmark implication of 0.96 or above, very lamp weight intensity component can arrive several than 0.9 shown in Figure 4. Figure 4 The collapses of the DFCVERT-MV375/6B voltage founding converter technology, intensity element and tide conditions, we can see from the diagram, voltage reference frequency manoeuvre engineering than the existing gateway frequency converter, consecutive several speed, electromagnetic clutch lift dash technical knowledge such as might factor is much higher, with wholeheartedly no lack towards sweeten voltage converters intensity factor discipline equipment, and other technologies will require towards perfect the subjective intensity factor reimbursement equipment.
(3) high effectiveness DFCVERT-MV375/6B converter with 95% of high competence (up in the direction of 97.5%), specially past the efficiency of low-speed race technology than the other technological superiority of very large, well Speed efficiency than other technologies (30% ~ 80%) is much higher. Figure 5.
(4) low goods ripple torque DFCVERT-MV375/6B converter lacks no external profit filters can deliver sinusoidal wages voltage and frequency converter with low yield produced voltage distortion, not to raise send disturbance operation. Our joint project employs the converter stringently lessens the production of the harmonic prevailing (less than 4%), to bypass the warmth and the engine torque ripple. Thereby weakening the device's electric powered tightness and mechanical stress, Figure 6 illustrates the guessed high voltage inverter output voltage and output newest waveform.
(5) Energy Obvious superiority Use DFCVERT-MV375/6B inverter burden qualities can be mended to self-acting alter Saving Machine dash and cram matching, to accomplish intensity saving. According to thread and fluid mechanics Fans Equation Energy utilisation Relationship with the motor dash refurbished up side, the motor tempo can be adjusted by frequency converter may make noteworthy energy savings. If the motor speed to role at 80% of the ranked speed, might utilisation can be dampened to (0.8) three charities 50%.
(6) high reliability, simple maintenance I am an expert from Frbiz Site, usually analyzes all kind of industries situation, such as cooking oil suppliers , organic avocado oil.
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