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In order to address the economical dispatch problem in islanding microgrids, this paper proposes a criterion and a decentralized economical-sharing scheme. The criterion is to judge the optimal economical-sharing whether can be realized via the decentralized approach. Then an optimal decentralized economical-sharing scheme is proposed. This overcomes the limitations of traditional centralized control,...
This paper presents an autonomous frequency and voltage control strategy for a standalone doubly fed induction generator (DFIG). The main aim of this study is to keep stator frequency as well as stator voltage at the desired value under different load and variable wind speed conditions without using position sensor. The proposed sensorless method is based on the detection of the stator frequency and...
In this paper, a model predictive control scheme is proposed for the load frequency control (LFC) problem of a two area deregulated power system with measured (contracted) and unmeasured (uncontracted) loads. The proposed controller is designed by posing the problem as a tracking one with states and input constraints representing generation rate constraints and input limits respectively. The simulation...
With the increasing application of electrical and power electronic equipments, there are more and more power quality problems due to the special loads applied to the power grid even the whole power system. A definition for the Pulsed Power Load is advanced, and 3 types of circuit structure model of pulsed power load are devised with the analysis of its fundamental, among which the differences of modeling...
Under frequency load shedding has been widely used to restore the power system frequency following a severe generation demand unbalance due to a disturbance. If system frequency is not counteracted properly system will be led to major blackouts. This frequency decline may be corrected by shedding certain amount of load so that system is back to stable state. This paper reports a case study on Sri...
In this paper, a frequency control method is introduced for wind-diesel hybrid system by using a sliding mode controller and a Super-Capacitor energy storage system to reduce frequency deviations. By means of the proposed method, output power control of WTG system considering the conditions of power utilities and maximizing energy capture are achieved. The proposed method is compared with the conventional...
In this paper, frequency control performance in a PV-diesel hybrid system is improved by using an energy storage system (ESS) with a virtual inertia controller. Simulation results show that the proposed method is feasible to reduce the frequency deviations and delivers maximum power compared to a fuzzy logic controller based method.
Frequency stability is the critical problem for isolated power grid. According to the actual situation of GuiLin isolated operation mode, a detailed single machine alone net simulation model was found which based on the YongFu power plant, though a lot of simulation test and theoretical analysis, the effect on the isolated power grid frequency stability that caused by parameter setting of the governor...
For conventional motor soft starter, the starting torque would be seriously decreased when reduce the starting voltage, so it is limited to light load, However, many overloading start-up is required in practical applications. According to the relationship between three-phase asynchronous motor electromagnetic torque and power frequency, when keeping the size of voltage unchanged, the torque can be...
This paper proposes a new method to determine the droop of the inverter-based distribution generations (DGs). Conventionally, inverter-based DGs have droop controller with fixed slope according to their capacity. Some additional control methods have been proposed in order to enforce the maximum or minimum limit of a unit. However, in some severe cases, the frequency deviation during the islanded mode...
This paper deals with the control of a small power wind turbine working in stand-alone mode. The fixed-speed fixed-pitch wind turbine drives a permanent magnet synchronous generator (PMSG), which supplies three-phase and single phase loads. Due to the presence of such consumers, unbalanced voltages appear. In addition, as the loads supplied by this generating unit are variable by nature, frequency...
New energy generation systems, such as photovoltaic cells or fuel cells are increasing in application on distribution networks. These power sources require an inverter to connect to an AC network. There is the possibility that sub-network containing inverter power sources will be disconnected from the utility system to become isolated networks. This paper focuses on an isolated distribution network...
Event-driven controllers differ from the standard digital controllers as their sample times are generally not periodic (time equidistant). In literature several proposals for event-driven controllers are made in order to reduce the number of control updates and consequently the processor load needed for its implementation. This is possible without deteriorating the control performance significantly...
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