Nov 25, 2023 · According to Eqs. (3) and (4), the sum of the three-phase load currents and the three-phase currents of all N inverters in Fig. 1 is zero. At the start of operation, the capacitor
Aug 1, 2024 · To suppress the CMV and circulating current simultaneously, an improved control method is presented. At first, the discrete model of paralleled 3P2L inverters is established,
Aug 31, 2017 · In this paper, we derived a reduced-order structure-preserving model for parallel-connected grid-tied three-phase inverters. In particular, it was shown that N parallel inverters
May 28, 2020 · This paper presents a control technique allowing parallel operation of 3-phase voltage source inverters. The outer control loop that ensures appropriate loads sharing, is
Jan 13, 2011 · In three-phase systems coupled by ICTs, the injection of zero-sequence signals in the output voltage reference changes this flux. The aim of this paper is to explain the influence
Aug 6, 2020 · Modern electric distribution systems typically contain several feedback-controlled parallel inverters that together form a complex power distribution system. Consequently, a
Mar 5, 2018 · In this paper, a new three-phase grid-connected inverter system is proposed. The proposed system includes two inverters. The main inverter, which operates at a low switching
Aug 31, 2017 · This paper takes a step in this direction by formulating a reduced-order model for a collection of parallel-connected grid-tied three-phase inverters as may be seen in photovoltaic
The PWM control technique is the most effective control scheme for controlling the three-phase inverter. In this proposed method, carrier-based PWM schemes are used such as PD, POD, and APOD have been applied. These are also called constant frequency techniques; generation switching pulses for an N level inverter, an N − 1 carrier is required.
In this article, the three-phase parallel inverter can be controlled by MC-PWM (APOD, POD, and PD). The inverter performance can be evaluated in terms of THD. The block diagram of the proposed system is shown in Fig. 1. The proposed inverter circuit includes three single-phase five-level inverters.
Three single-phase five-level inverters are given to the 12 terminal of the three-phase transformer, and the neutral points are shorted. The key merits are that it obtains a higher output voltage with a reduced number of active devices, transformer, DC input source, and simplified control circuits.
Another problem is the common-mode voltage (CMV), which causes electromagnetic interference and threatens the safe operation of the system. There exists interconnection between these two issues in the paralleled 3P2L inverters. To suppress the CMV and circulating current simultaneously, an improved control method is presented.
Although three paralleled inverters have the same capacity, the filter inductances are chosen to be different, and the reasons are explained as follows. According to the theoretical designing rule of inverter parameters, the values of filter inductances are the same for the inverters with the same capacity.
Each single-phase inverter is generated 325 V from the DC link when gating pulses are applied from the control circuit. The voltage of the DC link is supposed to be greater than the inverter output voltage (> √2 × Vo). Failing to meet this condition, an inverter is unable to guarantee the power flow to the load.
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