Robust Predictive Current Control of PMSG Wind Turbines with Sensor Noise Suppression

Abstract

Model predictive control (MPC) is an efficient and multi-functional control scheme for synchronous permanent magnet generators (PMSGs). However, the effective management of traditional MPC depends on precise system models. Multiple uncertainties of permanent magnet flux, motor inductance, filter inductance and parameter measurement noise will limit MPC’s performance. The conventional linear extended state observer (ESO) can perform robust predictive control of the ultralocal model of the PMSG system to cope with parameter mismatches. However, the ESO is limited in balancing disturbance rejection with measurement noise attenuation. Since the amplification of high-frequency noise pollution can lead to both poor control performance and system instability, this challenge is of significant importance. To solve the problem, a new hybrid parallel cascaded ESO (PCESO) model-free predictive control framework is proposed using the three-level neutral-point-clamped (NPC) power electronic converter, on both the machine side and grid side. Analytical discussions of the time and frequency domain characteristics of the PCESO demonstrate its superior characteristics over the ESO. The proposed method can effectively balance parameter mismatch, disturbance rejection and high-frequency noise suppression. Finally, the effectiveness of the proposed method, under uncertainties of parameter mismatches, measurement noise and permanent magnet flux, is verified through real-time hardware-in-the-loop tests on a back-to-back grid-tied PMSG interfaced with an NPC power converter.

Controlling PMSG Wind Turbine Connected to Three Level Neutral Point Clamped Inverter Based on MPC

“…In [19] presented a plan for frequency control that may be used with isolated grid wind turbine generators (WTGs). The authors of [20] suggested using a new type of modulated predictive current control that requires less computing power for a three-phase back-to-back linked neutral-point clamped (NPC) converter in a wind energy system that uses permanent magnet synchronous generators (PMSGs). In [21], the amplification of high-frequency noise pollution is addressed by proposing a new hybrid parallel cascaded extended state observer model-free predictive control framework that makes use of a three-level neutral-point-clamped (NPC) power electronic converter.…”