Vannak Vai

Institute of Technology of Cambodia · Department of Electrical and Energy Engineering

Recently, DC-powered devices such as loads (USB plugs, chargers, LED lighting) and distributed energy resources (solar photovoltaic and battery energy storage) have been increasingly used. Therefore, their connection to the grid requires AC/DC converters, which raises the question of operating part of the grid in DC in order to connect DC loads to...

In this study, multiple techniques are used to generate and compare the AC low voltage (LVAC) topology. The shortest path (SP) algorithm is applied to determine the shortest radial topology in the first stage. Secondly, the Water Cycle Algorithm (WCA) is implemented in this case study to find the optimal phase allocation arrangement. In this paper,...

The low voltage (LV) distribution systems are extended year by year due to the increase in energy demand. To overcome this issue, distribution system utilities have been focusing on designing and operating an appropriate distribution system with minimum capital and operational expenditure for supplying electricity to users. This article compares di...

This paper implements an iterative linear DistFlow for the modelling of radial distribution grids. The method is intended for dynamic optimizations under gird constraints, and in the presence of distributed generation including storage units with time coupled constraints. It is demonstrated that traditional piecewise linearization for the losses es...

The unbalanced situation in power distribution systems is affected to distribution system operation considering efficiency and quality. This paper aims to provide an insight into the power loss reduction in unbalanced distribution systems through phase balancing using a genetic algorithm (GA) and an expansion of lines. The three different scenarios...

The paper focuses on network reconfiguration in power distribution systems for reducing network power losses and improving voltage profiles. This paper applies the switch opening and exchange (SOE) concept for obtaining the radial topology by following close all sectionalizing switches in the system then opening each switch that has the minimum los...

Distribution network restoration can be achieved by changing the operational state of sectionalized switches (SS) and tie switches (TS). Service restoration aims to optimize radial topology with minimum out-of-service loads plus the minimum number of switching operations to meet consumers' satisfaction. In this paper, the sequential opening branch...

Solar rooftop PV systems are an alternative resource due to its potential and environmentally friendly. It is getting more attractive for electricity utilities and consumers, not only in rural areas but also in urban areas. This paper addresses with techno-economic analysis of a grid-connected rooftop PV system for a factory, which located in Sangk...

Energy needs are increasing day by day, especially for developing countries, due to population growth and changing lifestyles. A suitable microgrid topology with renewable energy integration is considered to fulfill the people and society’s needs. This paper focuses on the design of AC microgrid topology for a nonelectrified village with the integr...

This paper addresses a comparative study of radial topologies and the impact of the topology with the integration of PV for a rural village considering the shortest line and load balancing improvement. This research paper aims to develop and compare the AC low voltage (LVAC) topology with different developed algorithms. The shortest path (SP) algor...

The distribution systems operate radially with meshed topologies thanks to tie-switches and sectionalizing switches consisting of the systems. The power distribution systems are undergoing evolutions strongly toward active distribution systems for reliability and quality of service enhancements through reconfiguration. The distributed generations a...

This paper addresses an optimal design of low-voltage (LV) distribution network for rural electrification considering photovoltaic (PV) and battery energy storage (BES). It aims at searching for an optimal topology of an LV distribution system as well as the siting and sizing of PV and storage over a time horizon of 30 years. Firstly, the shortest-...

This paper studies an optimal design of grid topology and integrated photovoltaic (PV) and centralized battery energy storage considering techno-economic aspect in low voltage distribution systems for urban area in Cambodia. This work aims at searching for an optimal topology including size of the battery energy storage by two different methods ove...

The energy consumption increases year by year due to the growth of the population and theeconomic conditions. In this context, the Cambodian government promotes and encourages thedevelopment of the electrification through several policies; all the villages must be electrified by2020 and at least 70 % of the households will be connected to the netwo...

The energy consumption increases year by year due to the growth of the population and the economic conditions. In this context, the Cambodian government promotes and encourages the development of the electrification through several policies; all the villages must be electrified by2020 and at least 70 % of the households will be connected to the net...

In a long-term planning procedure of distribution networks, it is essential to design an appropriate topology in order to satisfy economic and technical aspects. This paper presents a novel algorithm to optimize the topology and phase balancing to tackle the challenge of load demand uncertainty (i.e., growth rate and new load). The paper aims at de...

This research work presents a study of Low-Voltage (LV) distribution system integrated with Photovoltaic (PV) and Battery Energy Storage (BES) for an urban area in developing country. This work purposes to search an optimal topology and sizing of PV-BES for supplying the consumers. A mixed integer quadratically constrained programming (MIQCP) is de...