The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes a new control scheme for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). In this scheme, the generator and grid currents are controlled using a hysteresis current controller (HCC). The control system of the back-to-back converter based on the HCC is described. Modeling and simulation of the system are developed using Matlab/Simulink to...
In this research, controller for wind turbine capable of generating electricity even at low wind speeds is developed. The employed small vertical axis wind turbine has the capability of generating power at low wind speeds. However, the charging battery under low wind speeds is difficult because the terminal voltage of the generator cannot be kept high enough. To solve this problem, charge operation...
This paper proposes a class of optimal and robust controller for the islanded AC microgrid (MG) system which is composed of wind turbine generator (WTG), photovoltaic generator (PV), fuel cell (FC), micro turbine (MT), battery energy storage (BES) and loads. The proposed controller has two main functions: rationally utilizing MT, FC and BES, and regulating the AC bus frequency deviation. For such...
This paper discusses how to achieve high PV penetrations for a hybrid diesel-PV micro-grid via the means of a cloud forecasting system. The micro-grid control system utilizes cloud forecasts to forecast PV transients and manage online diesel generation. Simulation results for the test micro-grid showed that an array size of 2 MW achieved an energy penetration of 30.8% with «11.5 annual faults. Additionally,...
While many advantages can be offered by DC-based integrated power system, it is a challenging task to continuously maintain optimal performance with a dynamic load profile. Coordination between the real-time controllers and system optimizer is not a trivial task in such conditions. Some of the protection schemes provide fault detection and isolation functions, but do not consider system level optimization...
A power oscillation damping controller of the multi-terminal direct current (MTDC) system is proposed in this paper. In a MTDC system, due to the interaction between different generators, interarea oscillation has shown great influence on the system stability. To damp the interarea oscillation, a damping controller for MTDC system is proposed in this paper. Firstly, the topology and control strategy...
Power electronic converters enable wind turbines, operating at variable speed, to generate electricity more efficiently. Among variable speed operating turbine generators, permanent magnetic synchronous generator (PMSG) has got more attentions due to low cost and maintenance requirements. In addition, the converter in a wind turbine with PMSG decouples the turbine from the power grid, which favors...
Developing a test environment for smart grid forms an indispensable stage to the realization of the next generation of the electricity grid. The coupling of the physical power system and its associated communication network makes modern power grid a typical cyber-physical system. In this paper, a real-time power system was simulated in RTDS and the communication network in NS-3. This test bed includes...
With increased penetration of renewable energy sources in the bulk electricity system, it is important for power system planners and operators to maintain grid stability and carry out system impact studies for identifying reliability-related problems. Adequate models have been developed by the industry to represent positive sequence response of solar PV plants for grid interconnection studies. In...
The transition from the traditional power grid to the smart grid improves reliability, performance, and management, while simultaneously increasing its susceptibility to cyberattacks. One of the biggest weaknesses in grid security is the human agent responsible for its maintenance and operations. As such, it is crucial to embed hands-on understanding of grid operations and security, especially for...
An ALQR (Adaptive Linear Quadratic Regulation) method for the variable speed wind turbines system is proposed in this paper. The controller is designed for the wind turbine operating in the low wind speed (Region 2), in which the pitch of the blades is fixed at the optimal angle. Since the wind turbine is a nonlinear system, the Kalman filter and the adaptive method are implemented in the controller...
A liquefied natural gas facility in the United States is being expanded to allow liquefaction of natural gas and export of liquefied natural gas while keeping intact the existing import facilities. This means adding more loads and steam-based generation to the existing gas turbine generator portfolio. The upgraded system will feature six gas turbine generators and two steam turbine generators in an...
A market-based control approach is presented for the control of power flow within an electric ship. The proposed control method consists of an artificial market in which various actors (a consumer and firms) behave according to microeconomic principles. Each piece of equipment within the engineering plant will behave as a firm, attempting to maximize its profit. The commanding officer will behave...
Previous approaches for early-stage shipboard-power-system simulation were driven by a need to perform time-domain simulation during the early design stage and included an internal idealized representation of the control system. Herein, the reduced-order physical model of the power system is combined with an independent representation of the control system. This allows the benefits of faster simulation...
This paper compares the performance of surface PM generators when operated with a switched-mode rectifier and an inverter. An analytical model including losses for the surface PM generator and power electronics controller is developed and validated against simulations and experimental results. This is used to generate efficiency maps as a function of output power and speed for the generator operating...
Large-capacity energy storage generator with short-term rapid conversion of mechanical energy into electrical energy characteristic, is often used as a pulse power supply for short-term and high-power load occasions. The rotate speed will rapidly decline, when large-capacity energy storage generator releases large energy to a DC load, and the power of the load will approximately linearly increase...
Wind energy have for many years been a growing alternative to fossil energy. The sizes of turbines are increasing to megawatt level. Wind turbines operate in a wide range of wind speeds but are shot down for high wind speeds. Traditional concepts are relatively stiff and have a cause stress on the gearbox. The turbine described in this paper overcomes some of these challenges by having flexibly and...
The excitation and speed control of marine diesel engine plays an important role in the stability of marine power station system. In order to verify the feasibility of a new type of controller used in the marine power station system, it is necessary to understand the working characteristics of the diesel generator set in the condition of switching and grid connection power generation. The paper firstly...
As strongly nonlinear, dynamic, multidimensional and large scale systems, power systems in operation are always influenced by the external and internal disturbances; and thus the serious threat to stable operation of systems exists. In this paper, based on the three order mathematical model of single machine infinite systems with valve control and under the conditions that systems have unknown damping...
IMOCA is a model-based architecture model dedicated to embedded process control systems in disturbed environment. These systems depend on various parameters which are difficult to set because they are bound to environment changes. In this paper we propose to extend IMOCA with the meta-model ImocaGen for managing the aspects of the code generation. ImocaGen allows to target multiple platforms and different...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.