Abstract
Power grids deal with the business of generation, transmission, and distribution of electric power. Recently, interest in power quality in electrical distribution systems has increased rapidly. In Korea, the communication network to deliver voltage, current, and temperature measurements gathered from pole transformers to remote monitoring centers employs cellular mobile technology. Due to high cost of the cellular mobile technology, power quality monitoring measurements are limited and data gathering intervals are large. This causes difficulties in providing the power quality monitoring service. To alleviate the problems, in this paper we present a communication infrastructure to provide low cost, reliable data delivery. The communication infrastructure consists of wired connections between substations and monitoring centers, and wireless connections between pole transformers and substations. For the wireless connection, we employ a wireless sensor network and design its corresponding data forwarding protocol to improve the quality of data delivery. For the design, we adopt a tree-based data forwarding protocol in order to customize the distribution pattern of the power quality information. We verify the performance of the proposed data forwarding protocol quantitatively using the NS-2 network simulator.
Highlights
Power grids involve the generation, transmission and distribution of electric power
At present and in order to reduce the transmission costs, the information gathered from major pole transformers is transmitted every 30 minutes to a remote monitoring center over the cellular communication network utilized by Korea Electric Power Corporation (KEPCO)
We focus on designing an efficient communication network in the electrical distribution system (EDS)
Summary
Power grids involve the generation, transmission and distribution of electric power. Figure 1 shows an example of the configuration of a power grid. Power quality is any power problem manifested in voltage, current, or frequency deviations, that results in failure or malfunctioning of the customer equipment [1]. It is one of the most important issues in electrical distribution systems. Korea Electric Power Corporation (KEPCO) [2] in Korea has monitored basic electrical quantities such as voltage and current from major pole transformers using their temperature. At present and in order to reduce the transmission costs, the information gathered from major pole transformers is transmitted every 30 minutes to a remote monitoring center over the cellular communication network utilized by KEPCO. The gathered information is transmitted to accomplish various tasks such as evaluating the current status of power quality, finding places where power quality problems are occurring, and planning measures to improve power quality
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