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In order to address the economical dispatch problem in cascaded microgrids, this digest proposes an optimal economical-sharing scheme via decentralized approach only with the local information. This overcomes the limitations of centralized control, where the central controller and external information exchange are needed. The frequency and current are used as carriers driven the distributed generators...
This paper presents the small signal model of a multi Photovoltaic (PV) inverter system to study the effect of controller and system parameters on the frequency modes of a microgrid. The paper describes the state space model of a system having two PV inverters connected by a line and working under droop control mode for active power sharing. The PV sources are working under load following mode and...
The hybrid power system consisting of new energy inverters and diesel generators has become a typical case of independent power systems in remote areas. Aiming at the problem of generator overload caused by sudden load applying in such systems, this paper proposes a novel emergency control strategy which increases the inverter output power according to the changing rate of system frequency. This control...
A distributed control law based on Model predictive Control (MPC) scheme is proposed for secondary frequency control in a deregulated market, which utilizes Demand Response (DR) along with Automatic generation Control (AGC). The proposed strategy of combining DR and AGC is termed as Load frequency Control (LFC) in the paper. The main contribution of the paper focuses on developing a model for LFC,...
The concept of decentralized demand response systems is not new, however descriptions of such systems are usually limited to general ideas and possible system services. In this paper the original modified stochastic Decentralized Active Demand Response (DADR) control algorithm has been presented. Fulfillment of the theoretically assumed properties has been numerically tested in a specially elaborated...
With the increasing application of photovoltaic, the micro-inverter with interleaved flyback module operating in continuous conduction mode (DCM) and discontinuous conduction mode (DCM)is more popular. However, its difficult to control output current of interleaved flyback micro-inverter because the transfer function has right-half-plane (RHP) zero in CCM and low gain in DCM. To solve this problem,...
Load Frequency Control (LFC) for an islanded microgrid is so critical due to intermittent behaviors of load and renewable energies. Performance of PID controllers deteriorates under uncertainties necessitating a controller that specifically considers these uncertainties. A stochastic controller can count for these uncertainties and hence a self-tuning PID controller based on Hebbian Learning method...
This paper proposes a novel load frequency control architecture based on differential games in energy supply-demand network integrating power networks and real-time electricity regulation markets. In order to establish the control architecture that each area minimizes his own cost independently on not only the electricity market layer but also the physical layer, we first present a novel load frequency...
This research addresses the control problem of microgrids and presents a robust distributed secondary control system for voltage regulation of an islanded microgrid with droop-controlled and inverter-based distributed generators (DGs). A consensus-based distributed control approach is proposed to restore the voltage and frequency of the islanded microgrid to the reference values for all DGs within...
In this paper, we design a controller using H infinity control theory and examine its frequency fluctuation suppressing performance in a small-scale system composed of real machines. The introduction of distributed power sources such as solar power generation and other sources of natural energy into smart power grids has been increasing in recent years. However, given that the amount of power generated...
In recent years, environmental problems are being serious and renewable energy has attracted attention as their solutions. However, the electricity generation using the renewable energy has a demerit that the output becomes unstable because of intermittent characteristics such as variations of wind speed or solar radiation intensity. Therefore, it can cause frequency fluctuations or voltage fluctuations...
Air conditioners can actively participate in frequency control for power system when it suffers from large power shortage. To make full use of reserve resources, a decentralized control strategy for air conditioning loads was proposed. Meanwhile, in order to facilitate analysis and control, the control strategy's probability model was established. Firstly, a modulation strategy responding to frequency...
In this paper, we propose a frequency-based autonomous control strategy for an isolated microgrid with the grid-forming energy storage system (ESS) in the South Korean island of Geocha. This strategy uses a system frequency as a global data signal using a grid-forming ESS. The distributed generation (DG) units in the microgrid use the frequency as a control signal without communication because the...
This paper deals with long term dynamic simulation extended to several months or years. Such simulation can be used in the power system development process.
We consider a virtual battery energy storage consisting of individual storage systems used for both, maximization of household PV-power own-consumption and provision of frequency containment reserve power. The frequency containment reserve power provision is managed by a central controller by setting benchmarks for each individual storage and also autonomously by each individual system based on the...
Electric cars in the worldwide vehicle stock have reached sizeable growth since 2010. Besides proven benefits to the sustainable development and wheel-to-wheel efficiency, electric cars can provide side benefits to car owners and to power system utility. Plug-in vehicles can behave either as loads or as a distributed energy and power resource in a concept known as vehicle-to-grid (V2G). This paper...
The traditional DG (distributed generation) wireless droop control base on “power-voltage-current” close loop is widely used. The power sharing performance of this method is significantly affected by the feeder impedance, mismatch inverter parameters, and unbalanced local load. Due to the affection of mismatched line impedance, the traditional droop method cannot make the reactive power shared accurately...
Nowadays, changes in the generation mix highlighted technical issues which was negligible before. One of the main integration problems could be the stability of the power system with high penetration of non-synchronous generation. The emerging technologies are connecting to the grid via power converters which means that these are practically decoupled from the grid parameter changes. This reduction...
In this paper a power system protection scheme based on energy storage system placement against closed-loop dynamic load altering attacks is proposed. The protection design consists in formulating a non-convex optimization problem, subject to a Lyapunov stability constraint and solved using a two-step iterative procedure. Simulation results confirm the effectiveness of the approach and the potential...
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