DSVPWM-based PMSG parallel GS-NSC system

A GS-NSC, parallel technology, applied in output power conversion devices, harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problem of reducing the active power output of the grid, improve power quality, reduce Active power loss, effect of reducing switching loss

Pending Publication Date: 2022-01-28
INNER MONGOLIA POWER GRP +1
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AI-Extracted Technical Summary

Problems solved by technology

The series grid-side converter realizes the flexible fault ride-through of the unit by dynamically compensating the...
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Method used

Formula (3) can get, when θ=π/3, SVPWM modulation phase voltage peak value is maximum and when adopting SPWM modulation, maximum phase voltage peak value is Udc/2, so SVPWM modulation can improve DC side voltage utilization rate up about 15.5%. Compared with SVPWM modulation, DSVPWM modulation makes the switch state change as small as possible by inserting zero vectors V0 and V7 in one switching cycle, and has the same DC voltage utilization rate as SVPWM modulation.
Therefore after the NSC adopts the DSVPWM modulation mode, the switching frequency of the switching tubes G1, G2, G3, G7, G8, G9 is reduced by one-third compared with the SVPWM modulation mode, and the switching frequency of the switching tubes G4, G5, G6 is co...
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Abstract

The invention discloses a DSVPWM-based PMSG parallel GS-NSC system, which comprises a box-type transformer W1, a circuit breaker K, an isolation transformer W2, a main grid side converter channel A, an auxiliary grid side converter channel B, a parallel grid side nine-switch converter, an unloading circuit and a PWM circuit, wherein one end of the box-type transformer W1 is connected with a power grid, and the other end of the box-type transformer W1 is connected with the main grid side converter channel A and the circuit breaker K; the other end of the main grid side converter channel A is connected with the parallel grid side nine-switch converter, and the other end of the circuit breaker K is connected with the isolation transformer W2. By adopting the DSVPWM, the NSC direct current bus voltage utilization rate is improved by 15.5%, the switching frequency is reduced by about 22%, and the switching loss is effectively reduced.

Application Domain

Ac-dc conversionSingle network parallel feeding arrangements +2

Technology Topic

Embedded systemPower grid +7

Image

  • DSVPWM-based PMSG parallel GS-NSC system
  • DSVPWM-based PMSG parallel GS-NSC system
  • DSVPWM-based PMSG parallel GS-NSC system

Examples

  • Experimental program(1)

Example Embodiment

[0060] Example 2, on the basis of Example 1, the grid was a 35kW high voltage grid. The output voltage of the box transformer W1 is 690V three-phase voltage. The parallel network side nine switching converter consists of 9 switching tubes. The unloading circuit consists of a switch tube and a resistor. The main network side converter channel A includes an inductor LM and a capacitor Cm. Auxiliary mesh side converter channel B inductor LA. Capacitor C is connected in parallel with both ends of the unloading circuit.

PUM

no PUM

Description & Claims & Application Information

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