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For a unified power flow controller (UPFC) operated in constant power-flow control mode, a novel control scheme of bus voltage regulation is presented. The voltage magnitudes of the ac buses are monitored in real-time operation and are controlled within their limits by the adjustment of the reactive power setting of the series converter. Firstly, the sensitivity of the voltage magnitudes of ac buses...
Currently, major technical challenges linked to the implementation strategy of Distributed Generation (DG) are associated with new studies and researches regarding the impact of renewable energy sources on the parameters of power transmission and distribution networks. To increase the energy efficiency and to reduce the power losses in power distribution networks, specific measures are proposed: increasing...
Currently, major technical challenges linked to the implementation strategy of smart grids are associated with new studies and researches on the impact of renewables energy sources on the parameters of power transmission and distribution networks. Current dedicated softwares permit the modeling and simulation of power distribution structure which includes different types of renewable energy sources...
The south east corner of the Great Britain transmission system, spanning the coastal region from Kent to Southampton, presents National Grid Electricity Transmission with a number of challenging, and evolving, issues - mainly in regard to thermal capacity and voltage control in transient, dynamic and steady state conditions. This paper presents an investigation conducted to define the location, amount...
The demand of electricity is growing up day by day. The present generation is trying to find new modes of electricity generation and their proper distribution. To enhance the operation of a power system we need to ensure perfect coordination between its various components. SCADA is going to play an integral role in the above task. It is a computer system whose role is to gather and analyze a real...
To realize massive integration of distributed renewable energy resources in future power system, the development of efficient measures for their integration is required. Using DC grid is more efficient and more compatible for the integration of renewable energy resources and energy storage devices. In the next-generation DC power network, many kinds of nodes which consist of generators, loads, energy...
Integrating Photovoltaic (PV) systems with battery energy storage in the distribution network will be essential to allow for continued uptake of domestic PV system installations. With increasing concerns regarding environmental and climate change issues, incorporating sources of renewable energy into power networks across the world will be key for a sustainable future. Australia is well placed to...
Grid-connected photovoltaic power station has changed the distribution of transmission power, thus influences the voltage distribution of load node. In accordance with the relevant provisions, grid-connected photovoltaic power stations should not be active participation of voltage regulation, but it grid-connected will have a supporting role for each node voltage. This paper proposes a maximum admission...
The power supply of regional power grid is a substation that connects the upper and lower grid. REI equivalent is applied in voltage and reactive power optimization to the problems of the conventional model. The relationship between the equivalent reactance which can effectively reflect the voltage and reactive power characteristics and the voltage/reactive power sensitivity matrix is deduced, and...
Wind generation has been the fastest growing power source over the past decade and this growth is forecasted to continue. Grid code requirements on wind power plant are becoming more stringent as the wind power penetration level increases. In order to identify the risk of incompliant with grid code requirements at the planning stage of a wind power plant project, a standard grid code study process...
An investigation was conducted to install wind farm to supply electrical power to the village of Ras Munif, the highest elevation in Jordan. The village installed capacity load was found to be 500 kW. A 25 windmills, 20kW each, forming the wind farm was found to be the best choice to supply the village with 100% of its needed power. The windmills will be spaced 50 meters along an unobstructed continuous...
The power source in micro-grid (MG) is either atmosphere dependent source (e.g. wind generator, solar etc.) or it will be small hydro or diesel turbine. This introduces power quality concerns in MG. It is because of small power number (MW per Hz.) due to limited size of the system and limited resources for system stability. In this paper, a new application of the UPFC is introduced. The slightly modified...
Vehicle-to-grid (V2G) or G2V systems essentially require an interface between the electric vehicle (EV) and the grid to facilitate the V2G concept. This paper presents a wireless power interface for the grid integration of EVs. The proposed bi-directional wireless power interface is based on the Inductive Power Transfer (IPT) Technology, and comprises a high frequency IPT system and a low frequency...
This paper analyzes the effect of ±800 kV Yun-Guang ultra HVDC transmission system, which operates respectively in the interconnection and island modes, on the voltage profile of the receiving-end Guangdong Power Grid during normal operation and after single-polar/bipolar blocked faults. Countermeasures are presented in terms of normal voltage control, coordination of three lines of defense and collocation...
Due to the asynchronous generator has many negative factors such as large power fluctuation, poor transient performance, low energy efficiency, etc. The doubly fed induction generator(DFIG) is becoming a popular concept and thus the modeling of DFIG becomes an interesting research topic. This paper develops the DFIG model of power flow and third-order transient in which the power converter is simulated...
The paper deals with the analysis of a low voltage dc distribution system. This dc system efficiently uses the opportunities that distribution generators (DG) offers for the power quality improvement, considering the more easily interconnection of the energy storage devices. The analysis of the energy management system and the behavior of the dc system during faults in the ac grid and dc grid are...
This paper presents a single phase grid-connected PV system integrating energy storage system (ESS) using cascaded multilevel inverter. A Discrete Fourier Transform (DFT) Phase Locked Loop (PLL) method is proposed to improve system dynamic performance. A coordinated active and reactive power management (ARPM) strategy is developed based on the dual-stage DFT PLL method. The point of common coupling...
Increasing wind power penetration into power grids is desirable because of its environmental and other benefits, unfortunately wind farms could cause serious voltage stability problems due to their output variability and intermittency. So this paper proposes a method that determines the optimum penetration level of wind plants into power systems. To achieve this purpose, a nonlinear optimization problem...
When it is in the wet season and the load is low, reactive power surplus and voltage rise are caused by high-efficiency power generation of small hydropower and load reduction in Linjiang region, Baishan city, JiLin province. These problems, which exist in the power grid, are systematically analyzed in this paper. The solution measures are proposed including generator in leading power factor on operation,...
Grid code requirements on wind power plant are becoming more stringent as the wind power penetration level increasing. In order to identify the risk of incompliance with grid code requirements at the planning stage of a wind power plant project, a standard grid code study process has been established in Vestas. The study process includes steady state load flow, short circuit studies and transient...
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