This paper presents an algorithm for Distributed Generation (DG) allocation planning, using fuzzy set theory and fuzzy multi criteria decision making based on the Bellman-Zadeh method. The proposed model considers power losses and investment deferral values on one side (goals) and line currents, node voltages and short circuit power values on the other (constraints). The objective of this work is to create a model which can be used to provide the best tradeoff between conflicting goals and constraints, inherently present in the DG allocation problem. The model is flexible and can be easily extended to include additional goals and constraints. In order to demonstrate its relevance, the proposed algorithm is applied to the realistic middle voltage (35 kV) distribution system in Bosnia and Herzegovina, in which various DG siting and sizing alternatives are considered. Results indicate that the algorithm is applicable to realistic systems and capable to provide valuable information regarding the influence of various DG allocation alternatives on system variables. It is expected that the algorithm will contribute towards the improvement of the existing DG planning process and it will be used in practical situations by planning engineers from the Utilities and Regulators.

Use of renewable energy sources for the purposes of electricity generation is increasing throughout the world. Connection of new generators, however, introduces significant challenges to power network operators and managers. The power system transient stability is affected by the grid connection of new generation units. The objective of this paper is to investigate asynchronous generator dynamic response issues and capabilities under three phase symmetrical fault conditions and to propose a methodological approach to designing a generator transient stability solutions. Analysis and methodology are introduced through a realistic generator connection example. Simulations show that power system stability can be significantly affected by the connection of new generators and that this phenomena needs to be carefully considered during the connection planning process. This paper is a part of an ongoing research on the distributed generation impact on power network and its aim is to provide two main contributions to the existing body of knowledge. Firstly, it is expected that this paper will contribute toward a better understanding of the influence that generators have on the power system transient stability. Secondly, this paper is expected to contribute towards the practical understanding of fundamental power system transient stability improvement solutions.

Electricity distribution network planning is a complex optimization process which requires assessment of various planning criteria. Planning is performed under conditions of system constraints, extreme uncertainty and information imperfection. It is possible, however, to obtain precise output value from imprecise input variables, in a process of fuzzy control. This paper proposes the application of Mamdani type fuzzy inference in modelling the risk of service interruption as one of the criteria used in distribution network planning.

In the second decade of 21st century there are still too many households without electricity supply in Bosnia and Herzegovina. They are situated in remote, sparsely populated, rural areas where distribution power lines were completely destroyed during the last war. The restoration requires large investments in power grid extension. The decreasing price of renewable energy installations and significant solar, wind and hydro energy potential in Bosnia and Herzegovina make a renewable energy based micro power system (MPS) worth considering as a feasible and cost-effective alternative. Optimal design of such system depends on several factors such as renewable energy sources (RES) potential for a specific site, load requirements, the required level of reliability, fuel price, etc. The paper investigates application possibilities of RES based MPS for rural electrification in Bosnia and Herzegovina. Four representative rural sites in different geographical and climatic regions were chosen to simulate load requirements and system production, based on a one year input data. Comparative analysis of wind and solar resources potential for each site is given as an input to the feasibility assessment of the MPS. The optimal design of MPS is proposed based on an energy production analysis and financial viability analysis for each site under investigation. A sensitivity analysis is conducted in order to determine how system parameters and total cost may change if the system is designed with different reliability criteria.

Power system stability issues are extremely important for safe and effective operation of the system. They can be categorized as rotor angle, frequency and voltage stability issues. Grid connection of new generators can have significant impact on overall system performance and stability. This paper presents investigation of a wind farm transient stability under symmetrical three phase fault conditions. Theoretical background of induction generator, its simulation model and dynamic response analysis procedure is discussed through a realistic wind farm connection example.

Electricity networks have traditionally been built and managed by government owned, vertically integrated companies. Modern systems are undergoing significant organizational, structural and technological changes. These changes are driven by two processes. The first process is market liberalization which requires reorganization of state owned monopolies, unbundling, establishment of independent system and market operator and regulatory authority. The second process is the energy transition from conventional energy sources to renewable energy. These two processes present a new energy paradigm. The process of market liberalization is mature in European Union while its practical initiation is still expected in Bosnia and Herzegovina. Important step for Bosnia and Herzegovina is integration in Southeastern Europe Regional Electricity Market. European Union policy goal is creation of a single Internal Electricity Market. This implies that electricity future of Bosnia and Herzegovina lies within the large European Electricity Market. This paper investigates Bosnia and Herzegovina's sector and market specific policy priorities, challenges and opportunities with respect to electricity market liberalization and integration process. Main objective of this paper is to present current situation of electricity market in Bosnia and Herzegovina, identify steps required to achieve full market liberalization and assess the regulatory framework required to face challenges of a new energy paradigm. This research seeks to determine what are the opportunities and challenges of electricity market liberalization in Bosnia and Herzegovina and how do the regional integration help in overcoming current and future energy challenges. Research is undertaken by collecting and analyzing relevant electricity consumption and production data and relating them to specific market and structural policies within national and regional framework. It was determined that sector specific priorities are unbundling, restructuring and reorganization. Market specific issues such as demand and supply side imperfections can only be partially solved within national framework. Regional regulatory issues, interconnection management and global investment policy cannot be adequately managed from the national perspective and need to include adequate regional coordination mechanisms. Key words: regional electricity market, deregulation, liberalization.