熔炼系统布局方案和串并联电路的关系

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          Relationship between layout scheme of smelting system and series parallel circuit

          Font Size: [Big][Mid][Small] 2016-8-24    Views: 447    

          One.Comparison of parallel circuit and intermediate frequency power supply of series circuit



          Two, parallel circuit and the comparison of series circuit

          Comparative content



          Parallel circuit


          Series circuit



          Working principle


          Current type inverter. Inverter SCR in parallel circuit for high voltage small current working state.

          Voltage type inverter. The operating state of the thyristor in series circuit for low voltage and high current.

          Power control mode



          Controlled rectifier, through regulating the conduction angle of the rectifier, and then change the DC voltage to adjust the output power.


          Rectifier full open, through the adjustment of the inverter frequency to adjust the output power.

          Load matching range

          narrow



          broad


          Inverter current

          Only 30% of the coil current flows through the controlled silicon, and the inverter controls 30% of the coil current.

          100% of the coil current flows through the inverter, and the inverter controls 100% of the coil current.

          DC filter form

          Large inductance filter, AC rectifier into DC, DC energy stored in the reactor.



          Inductance and large capacitor filter, the AC rectifier into DC, DC energy stored in the capacitor.


          Power factor

          Controlled rectifier, the power factor is low, only in the case of high power 0.9.

          Rectifier full open, power factor at any time "0.95.

          High order harmonic

          Controlled rectifier, in the state of non full power, due to the parallel inverter is through the regulation of DC voltage, to adjust the power, so in the low power state, a significant increase in the harmonic component. Pollution to the power grid is also more serious.



          Rectifier full open, high order harmonic.


          Start-up conditions



          Need to start circuit.


          Easy to start, start the success rate of 100%, no need to start the circuit

          Feasibility of dual power supply or multiple power supply

          To achieve more difficult dual power supply.

          Is very easy to achieve dual power supply.

          Under the same power (KW), the capacity of the power supply department




          High x 1.2=KVA KW (required to pay for the power sector)





          Low x 1.1=KVA KW (the capacity required to pay the electricity sector)



          Three.parallel circuit and the comparison of the intermediate frequency power supply

            In principle, a series or parallel circuit can be used in all kinds of layout schemes.

            As far as possible using series resonance, it is easier to obtain a wide range of load matching.

          >10000KW, parallel circuit will show the advantage.

          >10000KW, series resonance (non principle) in the project risk.

          >10000KW, series resonant existing reasonable proven engineering layout and design cannot be effectively supported by switched systems. 

              



          Series resonant can not realize the small current switch, under high power condition, the reliability of the system is reduced, the risk is increased.



              

          >10000KW, series resonance (non principle) in the project risk.


          Four. Some development and improvement of high power parallel circuit

            Without series inverter SCR

            No need to increase the line voltage

            No starting circuit

            Using the non - iron core direct current reactance

            Full power control is not entirely dependent on rectifier control

            Rectifier control + inverter control (not limited to conventional fixed TOT control)

            Higher power factor

            A wider range of load matching

            More stable and reliable operation

            Transformer neutral point floating operation

          Five, parallel resonant high power melting furnace

           



          Six, parallel resonant high power switch type melting furnace





          Seven, 30T, 18000KW parallel resonant melting furnace


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