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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Problems solved by technology
The series grid-side converter realizes the flexible fault ride-through of the unit by dynamically compensating the voltage of the grid-connected point, but it will reduce the active power output to the grid during the fault period
Method used
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Embodiment 2
[0060] Embodiment 2, on the basis of Embodiment 1, the power grid is a 35KW high-voltage power grid. The output voltage of the box-type transformer W1 is 690V three-phase voltage. The parallel grid-side nine-switch converter consists of nine switch tubes. The unloading circuit is composed of a switch tube and a resistor connected in series. Channel A of the converter on the main grid side includes an inductor Lm and a capacitor Cm. Auxiliary grid-side converter channel B inductor La. A capacitor C is connected in parallel at both ends of the unloading circuit.
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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.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a DSVPWM-based PMSG parallel GS-NSC system. Background technique [0002] The nine-switch converter (Nine Switch Converter, NSC) is developed from the back-to-back twelve-switch tube converter, and has excellent characteristics such as small size, high power density, and simple driving and protection circuits. In recent years, it has gradually expanded from the field of dual-motor drive to many fields such as uninterruptible power supply, new energy vehicles, power grid power quality, and new energy power generation. [0003] Due to the low utilization rate of the DC side voltage due to the NSC coupling structure, the current research on the NSC modulation method mainly focuses on improving the modulation depth, and the research on the switching loss and other directions still needs to be further explored. [0004] The direct-drive permanent magnet synchronous wind turbine...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02J3/38H02J3/01H02M7/5387
CPCH02J3/381H02J3/01H02M7/53875H02J2300/28Y02E40/40
Inventor 李航王梦涛云平平米玥韩俊飞任永峰任博刘佳树
Owner INNER MONGOLIA POWER GRP
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