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Many efforts have been made to improve the performance of power electronic systems with active capacitive DC-link module in terms of power density as well as reliability. One of the attractive solution is an active capacitive DC-link with the series-connected circuit because of handling small-rated power. However, in the existing control method of this circuit, the DC-link current of the backward-stage...
Power sharing performance is a critical issue of hybrid energy storage system (HESS) in autonomous DC microgrid (MG). In this paper, a novel integral droop (ID) is proposed to mimic dynamic characteristics of the capacitor by using energy storages (ESs) with quick response. The main advantage of the proposed controller is that dynamic power sharing among ESs is automatically realized in the decentralized...
This paper proposes an adaptive mixed game control algorithm to realize optimal load planning in cell sites forming a microgrid powered by renewable sources. Cell site controllers use renewable sources power generation and local load predictions to plan future coordinated load management, renewable power generation and local energy storage. Mixed game methods have been proved to offer an adequate...
In addition to random power fluctuation, the unpredictable high ramp rate is another uncertainty of Photovoltaic (PV) power output. It increases the requirement of both the amount and response speed of operation reserves at different time scale in the grid. The fast fluctuation of PV needs to be compensated by frequent ramp up and down reserves. Traditional generators will face heavy wear and tear...
This paper gives an overall review of the working principle of the inertial response from the synchronous condenser for frequency support in the grid. In addition to this, four proposed frequency control strategies for improvement of network frequency response by static energy storage devices, such as the Static Synchronous Compensator (STATCOM) with suitable energy storage elements or the battery...
Energy storage systems (ESSs) are desired and widely applied for power smoothing especially in systems with renewable generation and pulsed loads. High-pass-filter (HPF) is commonly applied in those applications in which the HPF extracts the high frequency fluctuating power and uses that as the power reference for ESS. The cut-off frequency, as the critical parameter, actually decides the power/energy...
This paper proposes a new power decoupling method for a high-frequency cycloconverter. The cycloconverter consists of two half-bridge inverters, two input filter capacitors, and a series-resonant circuit, which enables to convert the single-phase line-frequency ac input to the high-frequency ac output directly. The proposed power decoupling method stores the input power ripple at double the line frequency...
In dealing with the wide voltage range of renewable energy and energy storage device, non-inverting Buck-Boost converter (NIBB) have been utilized for DC-DC power conversion. This converter shows efficient steady-state performance under asynchronous control, but the dynamic performance is poor when input and output voltage are near. In this paper, the concept of unified mode control for NIBB is proposed...
In this paper, an adaptive integrated hybrid AC/DC microgrid module is proposed to accommodate a wide range of Distributed Renewable Energy Resources (DRERs), Distributed Energy Storage Devices (DESDs) and Distributed Demand Resources (DDRs) into the existing distribution systems. The concept and the architecture of adaptive integrated hybrid AC/DC microgrid module have been elaborately explained...
Traditional energy storage systems consisting of lithium-ion battery cells or electric double-layer capacitors (EDLCs) connected in series require a cell voltage equalizer in addition to a bidirectional PWM converter. The system is prone to complexity as two converters (i.e., the equalizer and bidirectional converter) are separately necessary. To simplify the systems, this paper proposes the transformer-less...
This work will present a novel photovoltaic (PV) inverter with integrated short-term storage. The topology combines advantages of microinverter topologies, such as module-specific maximum-power-point tracking, failure-tolerance, safety due to limited voltages, modularity, use of low-cost low-voltage components such as silicon field-effect transistors (FET), and simple expandability, with those of...
Islanded operation of microgrid is sensitive to frequency and voltage fluctuations due to lack of inertia. This makes it vulnerable to disturbances and intermittent renewable generation. Integration of energy storage devices is an effective but expensive solution to stabilize the microgrid. Electric Spring (ES) is a new power electronic based smart grid technology which can be used to provide voltage...
In this paper, voltage droop compensation associated with long pulses generated by solid state pulsed power modulator (SSPPM) is discussed. The pulse modulator with proposed compensation circuit can achieve low voltage droop in many applications required long pulse width regardless of load condition by using active droop control. The proposed circuit is composed to current source capacitor charger...
Modular multilevel converter (MMC) receives wide acceptance in high power, high voltage applications. However, large capacity capacitors are needed in the sub-modules due to low frequency fluctuation power. The voltage fluctuation is even larger especially in the startup of Motor drive or low frequency output application. Besides, the integrated energy storage systems (ESS) in MMC is used for recovering...
Distributed and controllable energy storages are commonly used to provide specific benefits to help the operation of electric power networks. The major benefits may include peak load reduction, renewable energy intermittent problem mitigation, as an emergency/stand by power supply, and provide auxiliary services to networks etc. Recently, more and more homeowners install various sizes of solar power...
To improve reliability of micro-grid system without energy storage, a maximum power point tracking (MPPT) algorithm considered spinning reserve capacity was proposed. Using implicit curve fitting method, the algorithm set aside 10% of PV array's maximum output power as spinning reserve of distributed generation (DG), and tracked maximum power point of load in real simultaneously. Moreover, to improve...
The electrical energy generation and storage from piezoelectric materials are focused and discussed in this paper. This kind of materials is able to directly convert mechanical energy into electrical one, which can be later stored by utilizing energy harvesting technique/circuit. The energy conversion from ambient vibration is indeed nowadays fascinating research area. Due to the compatibility to...
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