Abstract
In this paper, a current restoration method which can be applied to three phase parallel interleaved inverters (TPPII) using two current sensors has been proposed. In the proposed current reconstruction method, the branch current and the phase current of the two phases of the TPPII are sampled concurrently at the peak and valley of the pulse width modulation (PWM) carrier using two hall-effect sensors. Then, the phase current of each inverter is reconstructed by analyzing the sensed current with the current conduction path information according to the switch state in the peak and valley of the PWM carrier. This paper additionally analyzes the characteristics of the offset occurring in the detection process of two current sensors and it proposes a compensation method to reduce the offset on-line. In order to at once reduce the offset of the three-phase recovery current caused by the DC offset of the sensor, a coordinate conversion method and a low pass are used. To verify the performance of the proposed current recovery method and real-time offset compensation method, a simulation using PSIM software was performed, and experiments were conducted using a three phase parallel inverter composed of insulated gate bipolar transistor (IGBT) modules. In particular, the AC offset that occurred in the sampling process during the experiment was analyzed and modeled, and it was reduced by simple calculation.
Highlights
three phase parallel interleaved inverters (TPPII) is widely used in large-capacity energy storage system (ESS), uninterruptible power supply (UPS) and motor drive applications [1,2,3,4]
If the output filter of the three-phase inverter is not the same, there is a difference in the phase current of each inverter, and this differential current makes current control difficult
By using a PSIM simulation program, the proposed current construction method is verified via the TPPII, which operates in open-loop
Summary
TPPII is widely used in large-capacity energy storage system (ESS), uninterruptible power supply (UPS) and motor drive applications [1,2,3,4]. In order to solve problems when using multiple sensors, many methods have been proposed for reconstructing the current of a three-phase inverter using a single sensor. In [8], when the dead zone occurs according to the switching which it is difficult to recover the phase current by using the DC-link current and the state information state, the minimum voltage vector is injected and compensated to expand the measurement of the switch. [10] proposed a current reconstruction algorithm voltage vector and observer were used to improve the reconstruction performance in the dead zone in order to reconstruct on a low modulation index region. Inreconstruction addition to this, the algorithm for DC-link a current sensor offset wasexists in order to estimate the phase current through the load model [13].
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