Harmonic suppression in HVDC system using a modified control method for hybrid active DC filter

Abstract

A shunt hybrid active DC filter (HADF) is applied to eliminate DC transmission line current harmonics in HVDC transmission system. Since the harmonics increase transmission line losses and disturb control and monitoring equipments so HADF are used to suppress harmonics on DC transmission lines. In this paper a modified method is presented to control the shunt HADF which is not dependent on HVDC circuit parameters. HADF by injecting the compensating current to DC transmission line with the modified method suppresses the DC transmission line current harmonics significantly. Six major problems in design of modified control method have been discussed thoroughly. The principle of operation is described and the theoretical analyses are indicated to verify the control strategy. HVDC system is simulated by PSCAD/ EMTDC software. Simulation results and comparisons prove and validate the accuracy of these claims.

Separation of adjacent interharmonics using maximum energy retrieving algorithm

“…(ii) Those interharmonics close to fundamental or harmonics may not be detected properly [33]. Actually, many studies focused on interharmonic sources, impacts, measurement, limit values and mitigation can be found in the recent literature [34][35][36][37][38][39][40][41][42][43][44][45][46]. The research should be carried on in finding accurate interharmonic magnitude and frequency for adjacent harmonics/interharmonics [47].…”

Non‐characteristicharmonic resonance in line commutated converters‐high‐voltage direct current terminals: A practical case study

“…However, its cost and reliability are concerned in high‐voltage applications. To tackle this issue, the hybrid filtering has been proposed, which combines passive filters and active filters 17‐19 . The passive part is mainly used for the reactive power compensation, which greatly reduces the voltage and power rating of the active part, leading to a reduction in the cost.…”

Development of leakage energy allocation approach for time‐varying interharmonics tracking

“…(iv) Iterative harmonic analysis is unable to model non-linear load. For the above reasons, the research work in interharmonics measurement is still on the way [25][26][27][28][29][30][31][32][33][34][35][36][37][38].…”