Service Continuity of PV Synchronous Buck/Buck-Boost Converter with Energy Storage†
Abstract
:1. Introduction
- Fault diagnosis, including fault detection and location. It is the first mandatory step for a suitable response to a fault detected in a semiconductor device. Several methods have been reported in the literature. An open and short circuit switch fault diagnosis applied to non-isolated DC-DC converters is presented in [6]. It is based on the continuous monitoring of the inductor current slope, whose abrupt changes give useful information for fault detection. In [7], fault diagnosis based on the monitoring of the primary voltage of a transformer is proposed and applied to full-bridge DC-DC converters. A DC-DC converter diagnosis method that utilizes the magnetic near field as the diagnostic criterion is proposed in [8]. In addition, a switch fault diagnosis method based on the magnetic component voltage measurement is proposed in [9].
- Remedial actions encompass the reconfiguration of the converter and its associated control, if necessary. Several system reconfiguration approaches have been proposed in the literature, for a fault-tolerant converter with or without redundancy. They are detailed hereafter.
- First, the global service continuity of the two cascaded DC-DC converters circuit is proposed. The proposed approach allows one to ensure the service continuity of the overall conversion circuit by reconfiguring it in the presence of an OCF occurring in one of the two converters. Moreover, only a single redundant switch is used to guarantee the fault-tolerant operation of this two-stage conversion circuit and thus its overall service continuity.
- Second, although the cascaded circuits in healthy and post-fault conditions are not the same, the same control is applied in both operating modes. This unified control is advantageous for the following reasons:
- −
- Reconfiguration time: After an OCF detection, the control used in healthy conditions is not modified; thus, the service continuity is guaranteed with high time performances; in the post-fault operation, the reconfigured converter can be reconfigured and controlled as soon as the OCF is detected.
- −
- Reduced controller complexity: In the proposed system, the so-called “fault-tolerant control” that is always associated with fault-tolerant operation is the same as the control applied in the healthy operation mode: only the choice of the switch(es) to be controlled in healthy conditions or post-fault operation is added. Consequently, the overall controller complexity is reduced as much as possible.
- −
- Operating point maintenance: Even if the operating circuits before and after an OCF detection are not the same, they are electrically equivalent under synchronous control. Thus, applying the same synchronous control after and before the OCF detection and the circuit reconfiguration, the operating point values are maintained, and the load is not stressed with the circuit reconfiguration changes.
- −
- Implementation cost: From the implementation point of view, the reduced complexity of the controller used in both operating modes considerably limits the additional costs needed for its design.
2. Proposed Reconfigurable Converter and Remedial Actions
3. Control of the Proposed Fault-Tolerant Circuit
3.1. Principle of the Control
3.2. Maximum Power Point Tracking Algorithm
3.3. Output Voltage Control
4. Rating of the Inductors and
5. Simulation Results
5.1. PV System Modeling
5.2. Simulation Results: OCF in the Switch
5.3. Simulation Results: OCF in the Switch
6. Discussion and Conclusions
Author Contributions
Conflicts of Interest
References
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Elements | Value | |
---|---|---|
1.2 A | ||
17.5 V | ||
PV | 1.5 m | |
n | ||
A |
Elements | Value | |
---|---|---|
15 H | ||
100 H | ||
DC-DC | 100 F | |
22 F | ||
12 V |
Parameters | Values | Description |
---|---|---|
12 V | Open-circuit voltage of the battery | |
1 m | Serial internal resistance | |
1.5 m | Parallel resistance | |
4581 F | Parallel capacitor |
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Siouane, S.; Jovanović, S.; Poure, P. Service Continuity of PV Synchronous Buck/Buck-Boost Converter with Energy Storage†. Energies 2018, 11, 1369. https://doi.org/10.3390/en11061369
Siouane S, Jovanović S, Poure P. Service Continuity of PV Synchronous Buck/Buck-Boost Converter with Energy Storage†. Energies. 2018; 11(6):1369. https://doi.org/10.3390/en11061369
Chicago/Turabian StyleSiouane, Saima, Slaviša Jovanović, and Philippe Poure. 2018. "Service Continuity of PV Synchronous Buck/Buck-Boost Converter with Energy Storage†" Energies 11, no. 6: 1369. https://doi.org/10.3390/en11061369
APA StyleSiouane, S., Jovanović, S., & Poure, P. (2018). Service Continuity of PV Synchronous Buck/Buck-Boost Converter with Energy Storage†. Energies, 11(6), 1369. https://doi.org/10.3390/en11061369