Hybrid active filtering device suitable for LCC-HVDC system
A technology of LCC-HVDC and filter devices, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, power transmission AC networks, etc., can solve the problem of poor filtering effect, many filtering devices, and large footprint and other problems, to achieve the effect of excellent filtering performance, solve the tuning point offset, and occupy a small area
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[0014] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.
[0015] The structure of a hybrid active filter device suitable for LCC-HVDC system is as follows: figure 1 As shown, it includes active filter, passive filter and control unit; the active filter includes sub-module SM of H-bridge structure (full control device IGBT, diode, DC side capacitor C SM ), output inductance L r etc.; passive filters include high-voltage capacitors, inductors, etc.; control units include current sensors, harmonic detection, current control, and carrier phase-shift modulation; Figure II It is the equivalent circuit diagram of the LCC-HVDC system and the hybrid active filter device, which explains the working principle of the hybrid active filter device from the perspective of the circuit. According to Kirchhoff's law, the harmonic equivalent circui...
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