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This paper presents a sensor-less vector control method which estimates the rotor angle and speed of a nine-phase, Interior Permanent Magnet (IPM) machine with concentrated stator winding, especially for use at starting, zero and low speed operations. The injection of unique high frequency voltage signals into a non-torque producing third sequence circuit of the machine provides current information...
PM temperature measurement/estimation in permanent magnet synchronous machines (PMSMs) is convenient both for torque control and monitoring purposes. Most of existing methods provide and averaged/punctual temperature. However, PM temperature distribution is not uniform, which can have unexpected adverse effects like reduced accuracy estimating the torque produced by the machine or local demagnetization...
Continuous online monitoring of electrical assets is critical for reducing the process downtime and the associated financial losses in industrial applications. Majority of large induction motors, which are critical to industrial applications, are mains-fed. Condition monitoring of these mains-fed motors is critical for reducing the failure rate of these motor systems. Motor relays, commonly used to...
The battery energy storage systems (BESS) using modular multilevel converter (MMC) as the grid interfacing converter could integrate multiple independent battery stacks with flexible control capability by assuming the unique circulating current control scheme. Traditionally, the separate battery stacks in MMC are controlled to have the same state of charge (SOC) for maximizing the operational capacity,...
Power semiconductor devices are the major cause of the power converter failures together with the electrolytic dc bus capacitors. In harsh operating environments, the power devices are subjected to various mechanical and electrical stresses, wear, and vibration that contribute to increased equipment failure rate, where a failed component can cause unexpected interruptions, serious safety issues, or...
The injection of a high frequency signal in the stator via inverter has been proven to be a viable option to estimate the magnet temperature in permanent magnet synchronous machines (PMSMs). Injection of a pulsating d-axis current is especially appealing, as it is insensitive to the speed, Ld and Lq inductance variations. Furthermore, it is suitable both for interior PMSMs (IPMSMs) and surface PMSMs...
In this paper, a fast online parameter estimation scheme with sinusoidal d-axis current injection is introduced. Compared to the existing parameter estimation strategies, the proposed estimation scheme has relative faster convergence time and is feasible in the transient operation. This estimation scheme is realized by the recursive least square algorithm based on different operating points of the...
This paper presents a finite control set Model Predictive Control (FS-MPC) approach for a grid-connected converter, particularly suitable for non-stiff grids where under low Short Circuit Ratio (SCR) the performance of the controller may get affected by variations in supply impedance value. In order to avoid this problem, a novel supply inductance estimator that is based on the grid currents variations...
This research elaborately investigates an innovative work for high-accuracy SOC estimation using an adjusted experimental discharging/charging voltage (EDCV) signal of series/parallel-cell configured battery pack through combination between adaptive sliding-mode observer (SMO) and discrete wavelet transform (DWT). The steps for robust SOC estimation in the proposed approach as follows. First, after...
This paper introduces a new perspective of using boundary control with second-order switching surface to decouple the LCL filter into an “LC” + L structure to control the output current of a grid-connected inverter. The boundary control (inner loop) converts the switching network together with the “LC” filter into a first-order delay term. Then, the deadbeat control (outer loop) deals with the low-order...
Transient stability analysis (TSA) of power system is gaining importance given the dwindling gap of power generation and demand as well as increasing penetration of intermittent renewable energy sources. Current approaches to TSA are primarily based on time-domain, energy-function, and common-Lyapunov-function based analyses. This paper outlines a transient-stability-analysis approach based on polynomial...
Anti-clockwise pulsating injection method utilising the synergies of both pulsating injection and zero sequence voltage sensing has been proposed to enhance the rotor position estimation of permanent magnet synchronous machine (PMSM) drives. However, the detailed comparisons with the conventional carrier signal injection methods have not been carried out. Therefore, in this paper, for the three types...
In this paper, we propose a new position sensorless drive system for an interior permanent magnet synchronous motor (IPMSM) with maximum torque control. The proposed method is based on extended electromotive force (EEMF) and voltage injection synchronized with a pulse-width modulated (PWM) carrier. In the proposed method, in order to estimate the magnetic pole position using the EEMF, there is no...
Various MRAS-based estimation schemes of IM's rotor resistance has been proposed. Three simple rotor resistance identification methods of an induction motor drive are presented and compared. Two of the three techniques namely, electromagnetic torque equation, and reactive power equations are based on the generalization of existing methods. Authors proposed the third method, namely, active power equation...
A new ultracapacitor-battery HESS based on bidirectional Z-Source topology is proposed in previous research for better energy and space utilization. By controlling the power of UCs and machine, the steady average battery current get controlled indirectly. However, for safety consideration, the dynamic performance of proposed HESS should be considered, so small signal model based on state-space average...
A three-port DC/DC converter (TPC) having DC48V and DC12V ports, and an isolated DC port is designed and analyzed. The newly designed TPC integrates a non-isolated bi-directional DC-DC (NBC) converter and an isolated dual-active-bridge (DAB) converter using a coupling inductor technique, and DC power can be delivered multi-directionally among three DC ports. In the present study, a loss estimation...
A simple and accurate AC resistance model is essential for online estimation of copper loss which can be utilized in several ways of controlling and monitoring. This paper presents application of Squared Field Derivative on three-phase IPM machine to model AC resistance of rectangular conductors. It focuses on Finite Element Analysis to validate analytical model. The deviations from analytical model...
This paper proposes a novel rotor position estimation algorithm for the vector control of the doubly-fed induction generators (DFIGs) in wind power applications. The proposed algorithm uses a sliding mode observer (SMO) to estimate the rotor position information from the stator currents. The estimated rotor position is then used for the position sensorless vector control of the DFIG. The proposed...
A simple approach of sensorless junction temperature estimation is proposed for SiC power MOSFET devices. The junction temperature is derived in real-time by finding the instantaneous on-state resistance which is temperature sensitive and can be used as an indicator for device thermal estimation. Based on the scheme, a high-speed circuit is designed to quickly detect the on-state resistance and estimate...
This paper proposes to apply an instantaneous sequence estimation technique to enhance the control systems applied in distributed generation. It relies on a recursive least-square estimation of the αβ voltage components which are directly linked to the sequence components. The method was originally proposed to serve a dynamic voltage restorer controller. Here, this technique has been expanded to improve...
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