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Precision ultrasonic measurements in binary gas systems provide continuous real-time monitoring of mixture composition and flow. Using custom microcontroller-based electronics, we have developed sonar instruments, with numerous potential applications, capable of making continuous high-precision sound velocity measurements. The instrument measures sound transit times along two opposite directions aligned...
Energy audit can be one of the fastest and cheapest solutions to mitigate the gap between energy demand and supply since it identifies the energy loss and improvement areas. The paper shows a detailed analysis on building energy audit of some commercial buildings in Dhaka, evaluate and provide techniques to reduce energy loss, and a tool that has been developed to carry out energy audit of commercial...
This paper presents observations of real time frequency transients of Bangladesh Power System (BPS) including last country-wide blackout on 1st November, 2014 after HVDC station tripped with respect to frequency control and primary focus on Inertial Frequency Response. The inertia constant of a system describes the initial, transient, frequency behavior of a system when subjected to a real power disturbance...
In this paper, real time frequency transient analysis with respect to frequency control of Bangladesh Power System (BPS) countrywide blackout on 1st November, 2014 is presented which occurred after HVDC station tripped. The inertia constant of a system can be a significant tool for investigating the frequency stability of a system and the frequency transient of power system is a vital index for power...
Utilization of the existing transmission line capacity to its fullest is most important due to the continuous growth of the demand and rising cost of new transmission infrastructures. Due to the problems associated with voltage drop and stability limits, a transmission line can not be loaded up to its thermal limit. The potential benefits of installing Flexible AC Transmission System (FACTS) devices...
This paper presents a comparative study between Active Disturbance Rejection Control (ADRC) based Load Frequency Control (LFC) and proportional-integral-derivative (PID) based LFC. Both, single-area power system and multi-area power system have been considered where area control error (ACE) has been regulated in the presence of uncertainties in system dynamics and external disturbances. The ADRC proves...
Interconnected microgrid system enhance reliability and reduce spinning reserve due to higher redundancy. It is useful for areas where conventional power grid cannot be connected. This paper presents optimal economic dispatch strategy of distributed generation where two microgrids and a single energy storage system (ESS) are interconnected together. Genetic algorithm is used to minimize the operating...
Precision ultrasonic measurements in binary gas systems provide continuous real-time monitoring of mixture composition and flow. Using custom microcontroller-based electronics, we have developed an ultrasonic instrument, with numerous potential applications, capable of making continuous high-precision sound velocity measurements. The instrument measures sound transit times along two opposite directions...
Faced with the need of achieving the highest possible efficiency in the utilization of primary resources, nuclear power plants (NPPs) are considered as a viable alternative or addition. In case of transmission system voltage interruption, especially low voltage, NPPs have historically been susceptible to stations trip. Because of low voltage problem, the resulting loss in real and reactive power support...
Electric arc furnaces (EAF) are very large electrical loads and they cause voltage flicker problem in the power system due to their non-linear and random electrical characteristics. Voltage flicker (cyclic and stochastic) causes annoying sensation experienced by human eye and is a very important power quality parameter. In this paper, a Matlab-Simulink based flicker severity analysis module has been...
Electric arc furnace (EAF) acts as a source of sub-synchronous frequencies (SSFs) in the electrical network. If these SSFs lead to resonance, respective matched torsional modes of turbine-generator (T-G) shaft are excited causing torsional oscillating torques (TOTs) amplification. This may lead to gear damage, shaft fatigue lifetime reduction, severe damages to T-G shaft. This paper presents an assessment...
Reliability of power transmission corridor is of great importance for the reliability of the bulk power system. Any intermediate substation in the transmission corridor affects its reliability. Studies have been done on reliability of substation in isolation but its effect on transmission corridor has not been studied. Studies on transmission line reliability have also been carried out, but they focused...
Load flow solution is an inevitable tool for power system planning and operation. Among various methods of load flow solution techniques Newton Raphson (N-R) and its derivatives are the most popular and widely used ones. In Newton Raphson method one of the generator buses is treated as slack bus which is kept out of calculation during iterations. This is because of the fact that the slack bus is to...
Determination of the reliability of a substation is important as it helps locate weak points that may be contributing to overall power system unreliability. This paper evaluates reliability of 230 kV grid substations in Bangladesh subject to protection failures. The problem belongs to the dynamic reliability evaluation field. Event tree analysis is used as the main method. Fault tree analysis is used...
Active disturbance rejection control (ADRC) has gained significant attraction due to its simple tuning method and robustness against process parameter variations, whether the plant is linear or non-linear, time-varying or time-invariant. In load frequency control, the use of ADRC is proposed to regulate the area control error, frequency error and tie-line error in the presence of internal dynamics...
Control of active power and frequency in a power system is referred to as load frequency control (LFC). A linear combination of tie line power between interconnected system and frequency deviations, defined as area control error (ACE), is regulated to zero by LFC such that frequency and tie-line power errors are forced to zeros and a balance is achieved between generation and load. This paper presents...
Steel mills in Bangladesh are concentrated in the Chittagong region. Some of these steel mills are installing electric arc furnace (EAF). EAFs generate sub-synchronous frequencies (SSFs) which may pose threat to nearby turbine-generator shaft by causing torsional resonance (TR). This paper presents an investigation into TR due to EAF operation in the Chittagong region of Bangladesh Power System (BPS)...
In this paper a control strategy to regulate the output power of a stand-alone hybrid generation system is presented. The system is intended for variable load and includes wind, solar and diesel generation with battery bank. At first, a dynamic model of the system is developed. The control law admits six modes of operation. Decision criteria for the controller based on measurable system variables...
Oscillations in power system may appear due to normal changes in system configuration, addition of network components, rejection or addition of load, and due to forced outage of elements caused by faults and subsequent operation of the protection system. As power systems are highly non-linear and dynamic in nature, response to disturbances is essentially oscillatory. FACTS devices, such as Thyristor-Controlled...
Owing to the nonlinear characteristics, electric arc furnace (EAF) loads can result in serious electrical disturbances such as harmonics and voltage flicker in power system. Amplitude modulation of the supply voltage in the frequency range of 6–10 Hz created by EAF can cause annoying fluctuations of the electric lighting flux. This paper presents comparative study of different EAF models. The static...
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