Fuzzy Control for Smart PV-Battery System Management to Stabilize Grid Voltage of 22 kV Distribution System in Thailand

This paper presents a fuzzy logic based algorithm developed to bring smart functionality to an ordinary PV-battery system in order to maintain the grid voltage stability of the 22 kV distribution system in Thailand. This research focuses on minimizing grid voltage fluctuations by converting a typical PV system into a smart PV-battery system (SPVs-BSS). A SPVs-BSS will be able to control the electrical power from a PV system to maintain the grid voltage in case of unexpected events or emergencies. Grid support functions such as a variable reactive power control and active power control will be discussed, leading to strategies for charging and discharging the battery system in response to the status of grid voltage. Fuzzy Logic was used to develop this control algorithm, which is named the Voltage Stability Fuzzy Logic Algorithm (VSFL Algorithm). The methodology of this research consists of three parts. First, testing the grid inverter operated on grid support functions. Second, the VSFL algorithm was developed to manage both the grid inverter and the battery system. Third, a SPVs-BSS equipped with the VSFL algorithm was simulated by using DIgsilent PowerFactory software. Results showed that the SPVs-BSS equipped with the VSFL Algorithm successfully maintained grid voltage in target range

Investigations to Conduct a Study about Possibilities to Use Small Scale Solar Dish Stirling Engine System in Thailand

AbstractThis research studies the possibilities of generating electricity by using small scale solar dish Stirling engine system in Thailand. A solar dish Stirling engine system was evaluated and designed as prototypes for Thailand. The performance of system for electricity generation was also simulated under Thai climate condition. The results of the study can be structured in two parts. First is testing the existing Stirling engine and second is simulation the electricity generation by solar dish Stirling engine system prototype in Thailand. The existing Stirling engine at the Komplexlabor of the FH – Stralsund University, Germany was tested to understand the characteristics of the operating system. Stirling engine was operated at temperature of about 800 o C in the combustion chamber, being its nominal rotational speed 1,517rpm. Finally, the average Stirling engine efficiency was established in 22%. The results of simulation on solar dish Stirling engine were that the main components for a prototype of a solar dish Stirling engine system in Thailand shall consist of a Stirling engine with a nominal power of 25kW, and a 131 m2 dish concentrator. It can generate electricity about 27,946 kWh/year of electricity under Thai climate condition. During the working process, the heat lost on dish concentrator was 22% and heat lost within the Stirling engine was 60.84%. The system efficiency of this solar dish Stirling engine system was 17%

Energy utilization and the status of sustainable energy in Union of Myanmar

AbstractSustainable energy has turned into one of the most promising ways to handle the challenges of energy demand problems of numerous consumers worldwide. Myanmar's energy consumption mainly depends upon traditional energy such as fuel wood, charcoal and biomass. The government had laid the energy policy guidelines and emphasized in renewable energy resources to replace traditional energy types. Although domestic conventional energy sources such as oil and natural gas have been increasing a little bit through discoveries and development, these does not satisfy the demand of the country. In this paper, the energy utilization and the present sustainable energy status are mentioned. Following that, completed projects by each sector are provided. The future plan for energy conservation is finally highlighted

Experimental Studies on PV Module Cooling With Radiation Source PCM Matrix

Rise in PV module temperature ( $\text{T}_{\mathrm {PV}}$ ) majorly drops the electrical output of the PV system. This research presents a novel cylindrical tube PCM matrix that is not in physical contact with the PV module back surface unlike the existing PCM based PV module cooling techniques. This contactless PCM matrix prevents the PV module from thermal and physical stress, also it blocks thermal energy re-conduction from PCM to PV module. While stored thermal energy from PCM retransferred to the PV module during off-sunshine hours and also when the PCM turns to liquid $\text{T}_{\mathrm {PV}}$ starts to rise abruptly, this contactless PCM matrix minimizes these issues as PCM matrix receives thermal energy by the mode of radiation and convection; Besides, PCM matrix surface area is not enclosed with the PV module back surface area that reduces the thermal stress and re-conduction. Developed PCM matrix is integrated beneath the PV module at particular distances of 6 mm, 9 mm and 12 mm to optimize the spacing between PV module and PCM matrix. It is found that 6 mm spacing PCM matrix reduced the $\text{T}_{\mathrm {PV}}$ maximum of 2.5 °C compared to 9 mm and 12 mm spacing. This $\text{T}_{\mathrm {PV}}$ reduction enhanced the PV module electrical output by 0.2 % than PV without PCM and it is observed that 6 mm is an optimal spacing for the radiation source PCM matrix

Efficient heat batteries for performance boosting in solar thermal cooking module

Heat batteries show outstanding charging and discharging thermal energy capability with the latent heat of fusion (Hm) for solar thermal application. In this work, novel magnesium nitrate hexahydrate (MNH) based heat batteries are fabricated and tested for 1000 sequential thermal cycles. The MNH heat batteries demonstrate a high level of operational stability with the least corrosive rate. Real-time performance of the heat batteries was studied by incorporating them in the parabolic solar thermal cooking module. The developed MNH heat batteries based solar cooking module illustrates excellent heat retention capacity over 6 h after the sunshine. Temperature profiles under no load and full load conditions reveal the moderation and enhancement in the solar thermal cooking module's operational efficiencies. The solar cooking module's efficiency with the heat batteries reaches a maximum of 22.8% and 42.5%, under no load and full load conditions, respectively. Real-time cooking capacity with different edible materials under both outdoor and indoor environments proves the effective performance. Further, it is estimated that MNH heat batteries can be in full performance for a minimum of 2 years with maintenance-free and emission-free operations