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This paper proposes a new approach flux-weakening control strategy of the separately excited DC machine. The proposed method is based on the closed-loop speed control in which the field current is independently controlled to adjust the flux-linkage in the flux-weakening operation. In order to achieve the maximum torque in the constant-torque region, the maximum field current is employed, while it...
The environmental protection aspect promoted the use of renewable energies at a faster rate over the last decade. Among all the renewable energy sources one of the most popular one is solar energy source. The application of these sources to the grid requires additional compensating devices for mitigate the power quality problems and ensure voltage stability. The flexible AC transmission system includes...
An increase in the decentralization of power generation, it has become necessary to study the effects of distributed generation and propose a suitable modification to the protection system to increase the reliability. The paper focuses on the effect of distributed generation on the quality of power at any location concerned due to faults occurring on the power system. The waveforms of the currents...
This paper develops a steady-state analysis for the inductor current behavior and requirements in a single-inductor multiple-input single-output power converter (SI-MISO) topology with time-multiplexing control scheme. The SI-MISO can potentially reduce the number and size of components which is of benefit in many applications. However, it is important to appropriately select and control (1) the ratio...
A portable, modular, plug-and-play photovoltaic (PV) converter system is proposed in this paper. Each PV subpanel has an individual DC/DC converter connected in parallel to a semi-regulated DC bus. In order to accommodate diverse loads, a distributed control strategy for each converter is utilized so that the PV subpanel can operate at either Maximum Power Point Tracking (MPPT) mode or power shedding...
This paper presents a novel modular multilevel switched-capacitor based resonant converter (MMSCRC) to achieve dc-dc power conversion function. In comparison to existing multilevel modular switched-capacitor circuits, the proposed switched-capacitor resonant converter (SCRC) possess voltage regulation capability. Its modular structure accomplishes voltage conversion function and proposed closed-loop...
In the present day situation as the energy sources are becoming extinct to generate electricity, it has become a necessity to depend on the renewable energy sources to generate the power and convert it according to the type of appliances that are in use either AC or DC loads. This paper gives brief idea on the hardware implementation of the flyback converter.
The use of the self excited induction generator (SEIG) is widely used in remote area as standalone applications. The (SEIG) is reliable cheap and need a little maintenance. Voltage regulation strategy of the SEIG is the most important key factor in choosing its use in various applications. In this paper, a combination of shunt and series capacitors are used to guarantee the terminal voltage margin...
The paper proposes a Frozen Riccati Equation based approach for the construction of Lyapunov function to present a control law for the terminal voltage regulation in a post-fault transiently stable situation in a multi-machine power system. The test system is modelled in nonlinear singularly perturbed manner. Without linearization or complex solution of Hamiltonian-Jacobian Bellman equation, the gain...
Nowadays, renewable energy technologies, such as solar power and wind power, are trend to replace conventional energy resources. In the meantime, DC Microgrid is becoming popular in distribution systems due to the better compatibility and simpler system control strategy. This paper presents a hierarchical coordinated control strategy for DC Microgrid with wind turbine and photovoltaic array under...
Off-grid generating system suffers problems of voltage and frequency (VF) fluctuation as per the variable input wind/hydro/solar power. The problem has been discussed and to regulate VF of a wind based off-grid system a special dual-stator axial flux permanent magnet generator has been designed. Experimental evaluation of the generator has been performed and presented in the paper.
This paper introduces operation and control of fixed capacitor thyristor binary switched reactor. The proposed system is used for Voltage Regulation and Reactive Power Compensation of the transmission system. It consists of reactor banks, arranged in binary order steps with fixed capacitor is referred as FC-TBSR. Normally we use SVC (TSC+TCR) for reactive power compensation and voltage regulation...
This paper proposes three-level flying capacitor inverter based distribution static compensator (DSTATCOM) for shunt applications. Also, two new floating capacitors voltage balancing schemes using loss balancing technique have been proposed to balance capacitor voltages. Because of benefits like simplicity, transformation less implementation, and scope of desired power factor setting; a generalized...
Using parametric model, this paper presents a design procedure for STATCOM proportional-integral (PI) voltage controller for enhancing the voltage profile of the multimachine system under dynamic disturbances. The proposed design scheme constantly updates the PI controller thus preventing it to integrate or to saturate to a higher value under the condition of uncertainty faced by the controller arising...
The well-known droop controlled parallel voltage source inverters are widely used in islanded microgrids to realize proportional power sharing based on ratings. However, when considering different loss characteristics of inverters, traditional droop control method is not an optimal power allocation scheme. This paper proposed a novel hierarchical operation strategy to realize overall efficiency optimization...
Using parametric model, this paper presents a design procedure for STATCOM proportional-integral (PI) voltage controller for enhancing the voltage profile of the multimachine system under dynamic disturbances. The proposed design scheme constantly updates the PI controller thus preventing it to integrate or to saturate to a higher value under the condition of uncertainty faced by the controller arising...
Various configurations can be considered for a dc Microgrid (MG) comprising distributed generation (DGs) units and loads. Renewable energy sources and energy storage systems of plug-and-play nature can change the configuration of the MG at any time. Each configuration has a distinct and unique mathematical representation that influences the operation of the MG. However, the voltage throughout the...
Tunnel field-effect transistors (TFETs) can outperformMOSFETs in low power electronics due its low leakagecurrent and excellent threshold swing. In recent years, theapplication of TFETs in the design of sub-threshold cores havebeen proposed, operating at few hundred millivolts. Howeverprocess induced variations need to be considered while assessingthe achievable benefits of TFETs at such low voltages...
In this paper, the voltage regulation problem at point of common coupling (PCC) of low voltage grid-tied renewable distributed generation (DG) system has been addressed. This paper proposes and evaluates the performance of a novel intelligent adaptive neuro-fuzzy inference system (ANFIS) based proportional-integral-derivative (PID) control scheme to regulate the voltage of three phase grid connected...
Integration of distributed generation in power system challenges operation and management of power distribution network. This paper presents Modified Bat Algorithm for Optimal Reactive Power Dispatch (OPRF) of distributed generation for voltage support in distribution network. An objective function with constraints of voltage, DG reactive power, thermal limits of lines is presented. A modified IEEE...
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