Abstract
This paper proposes a stator inductance identification process for three-level neutral point clamped (NPC), inverter-fed Induction Motor (IM) drives based on a low-speed test drive. Conventionally, the stator inductance of an IM is identified by methods based on standstill or rotational tests. Since conventional standstill test-based methods have several practical problems when used with three-level inverters because of their nonlinearity, an identification method based on rotational tests is superior in such applications. However, conventional rotational tests cause unintended behavior because of the high speeds used during the test. In the proposed stator inductance identification process, the stator inductance is identified based on a low-speed test drive. In the proposed method, the stator flux is estimated using the instantaneous reactive power of the IM during low-frequency sinusoidal current excitation, and the stator inductance is then identified based upon this. Therefore, the proposed identification process is safer than conventional approaches, as it uses only a low-speed test. The accuracy and reliability of this method are verified by simulation and experiment using three motors with different rated voltage and power.
Highlights
Three-level neutral point clamped (NPC) inverters are widely used in industrial applications because of their advantages of low dv/dt, low total harmonic distortion and the capability of handling higher direct current (DC)-link bus voltages compared to two-level inverters, given the same voltage ratings [1]
The proposed identification process was implemented for three different types of induction motor with three-level NPC inverters to verify the feasibility of the proposed method
The hardware setup for the experiment consisted of the main circuit breaker, 6-pulse diode rectifier, of induction motor with three-level inverters to verify the feasibility of the proposed method
Summary
Three-level neutral point clamped (NPC) inverters are widely used in industrial applications because of their advantages of low dv/dt, low total harmonic distortion and the capability of handling higher direct current (DC)-link bus voltages compared to two-level inverters, given the same voltage ratings [1]. Short-time current pulsating stresses (di/dt) to HV-IGBT and power losses during the identification process high power three-level. Inprofiles this way, it is difficult perform a pre-running test rotate underand bothdeceleration accelerationprofiles and deceleration [10,11,12,13] In this to way, it is difficult to perform from low-speedtest to high-speed with atoconnected mechanical load; in the end this can cause inaccuracy a pre-running from low-speed high-speed with a connected mechanical load; in the end this in stator inductance identification. Proposed.In In proposed process, a very fed IM drive using a low-speedrotational rotationaltest test drive is thethe proposed process, a very lowlow-frequency of voltage similar the rated slip frequency is excited. The proposed identification process estimates frequency test generates very low-load torque [4].
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