Efficiency Improvement Scheme for PV Emulator Based on a Physical Equivalent PV-Cell Model
| Autor: | Dylan Dah-Chuan Lu, Mohammad Al-Soeidat, Habes A. Khawaldeh, Majid Farhangi, Li Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
one-diode model
General Computer Science Maximum power principle Computer science 020209 energy PV emulator 02 engineering and technology Inductor 7. Clean energy Maximum power point tracking DC/DC converter 0202 electrical engineering electronic engineering information engineering General Materials Science Voltage source Electrical and Electronic Engineering Operating point 08 Information and Computing Sciences 09 Engineering 10 Technology business.industry 020208 electrical & electronic engineering Photovoltaic system General Engineering Electrical engineering Current source TK1-9971 Electrical engineering. Electronics. Nuclear engineering control system business Voltage |
| Zdroj: | IEEE Access, Vol 9, Pp 83929-83939 (2021) |
| Popis: | Recently, a photovoltaic (PV) emulator is proposed which is based on a combination of a constant current source and a one-diode photovoltaic model. Its superior dynamic performance is compatible with that of a real PV system. Although it is power efficient at the maximum power point (MPP), it suffers from high power loss around and at the open-circuit voltage (OCV) operation condition. The PV emulator can be used for PV system analysis and testing, such as maximum power point tracking (MPPT). This paper presents a new switching circuit which is placed in parallel with the diode string to minimize the power loss. The switching circuit consists of a two-switch non-inverting buck-boost DC/DC converter. When the operating point of the PV emulator moves from the current source region to the voltage source region, the converter, which is more efficient, switches in to replace the diode string seamlessly to maintain the circuit operation of the emulator. Experimental results show that in the worst case scenario, i.e. OCV condition, the efficiency and temperature of the proposed solution reach 81.47% and 30.1 °C respectively, as compared with 2.8% and 94.2 °C respectively for the diode string only case. In terms of dynamic response, the proposed PV emulator lags the real PV panel by only 3.5 ms as compared with 120 ms by a commercial emulator under the 30% to 60% insolation change test. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|