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An optimal wind power curtailment strategy considering operation capacity credit is proposed in this paper to minimize the uncertain wind power curtailment and minimize the system operation cost. The relevant definitions in capacity credit assessment are applied in the power system operation situation. Based on operation capacity credit prediction, the optimal operation control strategy is defined...
This paper discusses the overall volume evaluation of capacitors in Modular Multilevel Converter (MMC). First, a theoretical formula of the ripple voltage on each cell capacitor in the MMC is clarified. Second, a formula of the total electrostatic energy is clarified. As a result, it is difficult to evaluate the overall volume of the capacitors because the total electrostatic energy is constant even...
This work proposes an event-based PI control scheme focused on FOPTD (First Order Plus Time Delay) processes with simple tuning methods. The scheme, called for short predictive SSOD-PI or PSSOD (Predictive Symmetric Send On Delta)-PI, which only considers two degree of freedom to determine the expected rate of events as well as the set-point and load disturbance rejection responses. The event-based...
In this paper, a detailed study and implementation of a reliable and efficient regenerative braking system is presented. It is applied on a prototype electric vehicle, that uses a hydrogen fuel cell as its only power source. Supercapacitors are used to store the energy that is generated during braking, transistors for switching the alternative circuits and an embedded computer controller program undertakes...
The event-based control of Integrator Plus Time Delay (IPTD) processes is investigated in this study. A two Degree-Of-Freedom (2-DOF) structure with simple tuning methods is proposed to cope with the set-point tracking and the load disturbance rejection tasks. A stability analysis is conducted and a simple tuning methodology is provided. Simulation results prove the effectiveness of the approach.
With rapidly increasing complexity of power grids in Europe, North America and Asia, liberalization of electricity markets and increasing penetration of renewable energy, the risk of large-scale emergencies and blackouts increases. This paper proposes a novel approach for development of software for modelling of decentralized intelligent systems for security monitoring and control in power systems...
The main subject of this paper is the classification and identification of observables for present and future grids. In order to make an inventory of present and potentially new observables, a systematic classification and identification of observables for future grids is conducted. After first introducing some fundamental definitions for observables, observables are further classified by the characteristic...
This paper considers the control of a 7-leg back-to-back Voltage Source Inverter (VSI) arrangement feeding a 4-wire load from a 3-phase Permanent Magnet Synchronous Generator (PMSG) operating at variable speed. The 7-leg converter is regulated using Resonant Controllers (RCs) at the load side and self-tuning resonant controllers at the generator side. The control system is augmented by a feed-forward...
In this paper the feasibility of using Savonius rotor for hydropower generation is presented. A detailed investigation for possible generation of single phase power using the same coupled to an asynchronous generator is carried out. The complete system is modeled in MATLAB/Simulink environment, one without using any power converter and the other using an AC-DC-AC converter. The control algorithm of...
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...
This paper describes the simulation of a distributed generation system with storage technologies. The simulation is performed using a SCADA software for a distributed generation system, considering the generation cost, the daily load, the power losses and the availability of the system's generating units. Also, a storage unit is added to the system. The system's generating units cover demand in order...
This research focused on the control of vehicle suspension by means of magnetic resistant force coming from the generating process. As the suspension system vibrates the kinetic energy is transformed into the electrical energy through a designed transmission mechanism which converts the translational motion into the rotational motion combined with the claw pole generator. Both resistant force and...
In this paper, we propose and solve the problem of feedback linearization of single-input control affine time-varying nonlinear systems. Feedback linearizability of time-varying is shown to be equivalent to the orbital feedback linearizability (or feedback linearization by state-dependent time scaling) of an extended version of the time-varying system. Necessary and sufficient conditions for feedback...
Variable pitch control technology is one of the key technology of wind power generation technology. This paper has studied the pitch control system of wind turbine and the variable pitch power control strategy for wind turbine. Based on the control system and control strategy, Hydraulic variable pitch control system model is established, and build a variable pitch wind turbine system. Then, it has...
This paper describes a CMOS hysteretic DC-DC buck converter with a low output ripple voltage and a constant switching frequency for mobile applications. The inherent problems of a large output ripple voltage that the conventional hysteretic DC-DC buck converters has faced have been resolved by using the proposed DC-DC buck converter which employed a ramp generator circuit to be able to increase a...
Harmonic distortion is often a challenge in marine vessel power systems due to the presence of large motor drives containing diode or thyristor rectifiers. Governing standards impose requirements on bus voltage Total Harmonic Distortion (THD) which can be demanding to fulfil. An attractive measure to reduce THD is to use 12-pulse rectifiers, as they are known to cancel the 5th and the 7th harmonic...
In this paper, an adaptive fuzzy tracking control is proposed for a power system in the presence of communication delay associated with the excitation signal. The proposed controller is designed using the universal approximation property of fuzzy logic systems. In the controller design process, an integral of the control effort over the delay interval is introduced in order to express the open-loop...
The purpose of modern wind energy conversion systems is to extract the aerodynamic power from the wind and convert it to electric power. The most popular today is variablespeed horizontal wind turbine (HWT) with three blades. The main objective of this paper is to design the controller that is capable to optimize the power output in the lower wind speed region and to maintain the rotor power limits...
Application of cardiopulmonary resuscitation to people suffering from cardiac arrest has become an effective way of increasing chances of survival. Current CPR is done manually, however new electro-mechanical resuscitation devices are capable of providing chest compressions at a constant rate and depth, even when the patient is being transported.
This paper presents a scalar volt per hertz (v/f) control technique for maximum power tracking of a grid-connected wind-driven Brushless Doubly-Fed Reluctance Generator (BDFRG). The proposed generator has two stator windings namely; power winding, directly connected to the grid, and control winding, connected to the grid through a bi-directional converter. The presented control technique is based...
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