Grid-Filter Design for a Multimegawatt Medium-Voltage Voltage-Source Inverter

By A. Rockhill, Marco Liserre, Remus Teodorescu, Pedro Rodriguez. IEEE transactions on industrial electronics (1982. Print), 2011

435 citations recorded by the source corpus.

This paper describes the design procedure and performance of an LCL grid filter for a medium-voltage neutral-point clamped converter to be adopted for a multimegawatt (multi-MW) wind turbine. The unique filter design challenges in this application are driven by a combination of the medium-voltage converter, a limited allowable switching frequency, component physical size and weight concerns, and the stringent limits for allowable injected current harmonics. Traditional design procedures of grid filters for lower power and higher switching frequency converters are not valid for a multi-MW filter connecting a medium-voltage converter switching at low frequency to the electric grid. This paper demonstrates a frequency-domain-model-based approach to determine the optimum filter parameters that provide the necessary performance under all operating conditions given the necessary design constraints. To achieve this goal, new concepts, such as virtual-harmonic content and virtual filter losses are introduced. Moreover, a new passive-damping technique that provides the necessary damping with low losses and very little degradation of the high-frequency attenuation is proposed.

Subfields: Control and Systems Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/b72f7b658aff00ec747733ec8f0ae6a4bb37fa4d

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Citations in the corpus

High-power wind energy conversion systems: State-of-the-art and emerging technologies (2015, methodology): “The grid current contains higher total harmonic distortion, and to meet the grid codes, LCL filters are used on the grid-side [79].”
Analysis of the Passive Damping Losses in LCL-Filter-Based Grid Converters (2013, background): “Therefore Pd ≈ PdH ∣∣∣∣ZdRd ∣∣∣∣ 2 (15) where Zd =ZCd ||ZRd ||ZLd ≈ ZCd ||ZRd are impedances for ω = ωsw .”
Modified Discontinuous PWM for Size Reduction of the Circulating Current Filter in Parallel Interleaved Converters (2015, background): “Due to limited switching frequency in the high-power converters, large filters are required [4].”
Robust Vector Control of a Very Weak-Grid-Connected Voltage-Source Converter Considering the Phase-Locked Loop Dynamics (2017, background): “In other words, the bandwidths of the outer control loops are usually much less than the bandwidth of the inner current control loop; in this range, the ac-side filter behaves mainly as an L filter [18].”
Finite Control Set Model Predictive Current Control for Grid-Connected Voltage-Source Converters With LCL Filters: A Study Based on Different State Feedbacks (2016, background): “To achieve sinusoidal line currents with low total harmonic distortion (THD), this problem has to be addressed by adequate filter design and active damping (AD) strategies [29].”
Generalized Design of High Performance Shunt Active Power Filter With Output LCL Filter (2012, methodology): “THE higher order LCL filter has commonly been used in place of the conventional L-filter to give a better smoothing of output currents from a voltage source converter [1], [2].”
Overview of Multi-MW Wind Turbines and Wind Parks (2011, neutral): “The increased power of the WECS and the consequent limited switching frequency pose stringent constraints on the filter, modulation, and controller/damping designs [90]–[92].”
LCL Filter Design and Inductor Current Ripple Analysis for a Three-Level NPC Grid Interface Converter (2015, background): “And even few have detailed analysis on the inductor current ripple with certain modulation scheme and pulse sequence [13].”