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The main problem in integration of renewable power sources to the electricity grid is the uncertainty introduced by the power forecasting process in the optimal scheduling problem, which can considerably increase the generation cost. This problem has been widely analyzed using scenario generation/reduction methodologies. However, the consideration of a reduced number of scenarios can limit the capabilities...
The paper presents all-inclusive study of recent techniques between year 2008–2012 dedicated for the cooling of large size electric generators. A ‘Six Stage Redundant Structure’ (S2RS) — hydrogen cooling system (HCS) clubbed with highly reliable and efficient process automation system is presented for HCS of integrated gasification combined cycle power plants. The work includes a brief discussion...
The paper presents a ‘Seven Stage Warm Redundant Structured’ (SeSWRS) hydrogen cooling system (HCS) for generators cooling in a typical thermal power station. The proposed system is equally reliable for steam and gas turbine based generating sections. System reliability of the proposed SeSWRS model is evaluated using MATLAB. The process control and instrumentation of the system is designed and simulated...
A comprehensive hydrogen cooling system (HCS) is required for cooling of the generators of 2×300 MW unit power plant at a pressure of 4 to 5 bar. The faster heat dissipation of generators depends on purity of hydrogen (H2), as it improves its ability to dissipate heat within generators. Therefore, the process involved should be reliable enough to maintain the availability of Hydrogen as and when required...
This paper presents a brief review of the coordination issues between the settings for generator automatic voltage regulator (AVR) overflux (V/Hz) limiters and monitors and the overflux protection relay settings. Recent blackouts have caused NERC (North American Electric Reliability Council) to develop standards for coordination of generator excitation control and protection with the aim of improving...
As power systems evolve to incorporate greater penetrations of variable renewables, the demand for flexibility within the system is increased. Combined Cycle Gas Turbines (CCGTs) are traditionally considered as inflexible units but those which incorporate a steam bypass stack are capable of open-cycle operation. Facilitating these units to operate in open-cycle mode is shown to improve system reliability...
Power and thermal considerations are becoming limiting factors for submicron circuits as technology scales down. In order to detect abnormal temperature changes so as to detect defects on chip, and increase reliability and service life of devices, an all CMOS temperature sensor for submicron circuits' test is proposed. A current proportion to absolute temperature is generated for achieving linear...
Many problems exist which can be modeled as a network of consumers competing for shared resources with limited interconnections. In such problems, the crucial factors include not only the number and ratio of consumers and resources, but also the topology of the network and the policy for assigning resources to consumers. This is a particularly powerful model for nanoelectronics systems due to the...
Converter system plays an important role in power drive train of a wind turbine. In order to achieve higher reliability, the modular concept is popularly utilized in converter system design in modern wind turbines. A converter module can be a channel composed of AC/DC/AC or a module composed of AC/DC or DC/AC. AC/DC module can be used on either generator side or grid side which depends on system operation...
The whole electric power system includes four aspects: generation, transmission, distribution and electricity users. Those four aspects all need maintenance to enhance system reliability and energy efficiency. Under deregulated electricity market, generating unit maintenance scheduling arrangements are very different with the traditional electric power system. In the tradition electric power industry,...
This paper analyzes the rural area's wind energy and sunlight resources in China by means of research and study about wind energy and light energy resources. An independent power supply system which complemented each other by wind and light is prompted here, and the system suits for most rural areas in China. This paper also introduces the design of the system about its basic structure and autocontrol...
Generating electricity from wind resources has many environmental and economic advantages over traditional fossil-fueled generation. As a result, there is little doubt that energy from wind will be a significant contribution to the electricity portfolio of the future. Due to the sensitivity of the network and the volatility of the wind resource, analysis of power system operations using expected wind...
Evaluation procedure for interconnection of distributed generation (DG) to distribution feeder is presented. Regulatory documents are used as guidelines for the approach. Three categories of interconnections are identified. Detailed interconnection studies are proposed to further investigation of prospective interconnections. Additional considerations for allocation and sizing of DG are discussed...
This paper presents an application of the stochastic optimal power flow method to determine the energy and reserve schedules for a system with large amount of wind generation. Unlike contingency analysis, the requirements for operating reserves based on the stochastic optimal power flow are not predefined. Instead, the reserve requirement is generated to meet both the system reliability and economic...
In a power system with high wind power penetration, reserve allocation is a major problem of system planning and operation due to the uncertainty and fast fluctuation of wind speeds. In order to achieve long term sustainable solution for electricity supply, the impacts of the installation of wind farms on system reliability have to be carefully studied. This paper describes the impact of installation...
In order to improve the celerity, veracity and security of the generator paralleling operation, a new type of generator automatic quasi-synchronizing device based on PIC16F877 and FPGA (Field Programmable Gate Array) was studied in this paper. The hardware and software designs were introduced. The device adopted PIC16F877 as main controller and FPGA as assistant controller which realized the control...
In this paper we describe this new scenario for the radio occultation data processing, which is based to the use of distributed system architecture. In particular, we describe our approach based on using a grid computing system in order to decrease the calculation of RO time and to increase the flexibility and reliability of the system. We want to focus the attention of the reader on how we managed...
This paper presents a methodology to determine the energy and reserve schedules with consideration of power system uncertainties. Unlike contingency analysis, the requirements of operating reserves based on the stochastic optimal power flow are not predefined. Instead, the reserve requirement is generated to meet both the system reliability and economic efficiency under system uncertainties. The stochastic...
The target of any power system is to deliver stable, clean and cheap electrical power to the customer. This paper offers two independent approaches to simulate the operation of the generating units in a power network. The first methodology depends on the load variation in each season while the other one is random through a certain sequence. Using the proposed approaches a comparison between the different...
This paper reports on the current UK scenario of islanded operation of active distribution networks with distributed generators (DGs). Different surveys indicate that the present scenario does not economically justify islanding operation of active distribution networks with DGs. With rising DG penetration, much benefit would be lost if the DGs are not allowed to island only due to conventional operational...
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