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In this paper, we study the stability of a thermal system with feedback control in which the sensor is modeled by a partial differential equation. The problem is motivated by the thermal management requirement in energy systems such as lithium ion batteries where the heating information must pass through a finite distance through conduction. The focus of this paper is to examine the stability issue...
This paper proposes a concept of free piston linear generator (FPLG) range-extender for the application of hybrid electric vehicles (HEVs). The coupling thermodynamics model of the FPLG range-extender is developed mathematically. Its stable operation characteristics are analyzed accordingly. In addition, the effects of the variations of the key operational parameters on the effective output power...
A H infinity observer based method is proposed to estimate the state of charge (SOC) for a series-connected battery pack for electric vehicles. In this method, an average virtual cell (AVC) model is defined and the SOC of the AVC model is estimated to represent the pack SOC when all terminal voltage differences (TVD) between each individual cell in the pack and the AVC are within a voltage value set...
Bidirectional DC-DC converter (BDC), is being widely used in all kinds of fields as both charger and discharger which can greatly lessen the volume and weight of the whole applied system. This paper analyzes mainstream topological structures of BDC and then proposes a bidirectional half-bridge converter with Micro Control Unit (MCU) in control of three working modes: buck charging mode, boost discharging...
In the view of making the full use and distribution of spacecraft power system energy, based on task requirements of the PV-BAT system under different fault models, the grid-tied converter's performance are verified, the function of the grid-tied controller in role of the energy converting are determined, for all kinds of energy conversion in the spacecraft, reference experience are provided.
This paper introduces a technical scheme of auxiliary power supply system of passenger train based on photovoltaic and energy storage, renewable energy will be injected into the power supply system of train by this system. This paper introduces the technical characteristics, energy consumption level and application situation of Chinese passenger trains, then design a new type auxiliary power supply...
At present, the capacity of most residential areas cannot meet the need of large-scale EVs (Electric Vehicles) charging. A strategy of coordinated charging for private EVs in residential area is proposed. Based on daily trip habit of EV and base loads of residential area, the method seeks for the period of the lowest total loads and arranges EVs for discontinuous coordinated charging in the valley...
STATCOM/BESS decoupling control strategies of active and reactive power is proposed for a single wind turbine with squirrel-cage induction generator (WSG). This control strategy can not only effectively suppress power fluctuations of WSG output, achieve unity power factor and grid connected control so as to significantly improve the power quality of WSG, but also real-timely adjust extra power into...
The paper proposed a new model of CCHP system driven by combining solar energy and internal combustion engine on the basis of traditional CCHP system driven only by the last one; joined the energy storage battery to improve the utilization of renewable energy sources and improve the shortcoming of solar energy; then established the multi-objective optimization model of economics, primary energy consumption...
In this paper, a new solar battery charger is proposed. The solar battery charger is composed of two solar modules and a dual-input DC-DC power converter. The two solar modules are connected to the dual input ports of dual-input DC-DC power converter, and the output of dual-input DC-DC power converter is connected to a battery set. The operation of dual-input DC-DC power converter is divided into...
In this paper, a grid-connected battery charger is developed. The developed battery charger is composed of a power factor corrector and a buck converter. The power factor corrector control the input current to be sinusoidal and in phase with utility voltage to perform unity power factor. The buck power converter is step-down the output power of power factor corrector to charge the battery set in constant...
A novel active power line conditioner (APLC) using power sources of fuel cell and battery set is proposed. The proposed APLC is composed of a current-fed full-bridge converter, a three-port three-leg power converter (TPTLPC), a fuel cell and a battery set. The TPTLPC manages the power conversion between the fuel cell, the battery set, the load and the utility. The power and control circuits of the...
This paper establish mathematical models aimed at minimizing the peak-valley difference of power load and maximizing the profit of consumer for the participation of EVs on the base of adopting real-time price in electricity market. Then solve it by Particle Swarm Optimization(PSO) algorithm, obtain load curves between EVs and power grid. Results show that effect of load regulation and value of profit...
Buck-boost constant current driving circuit is a flexible LED driving power supply, which can work properly in two modes of buck boost and boost. Buck-boost LED constant current drive circuit can adjust the operating mode according to vatiation of the load current to ensure that the output current is constant. The buck and boost topology structure is adopted as the main circuit of the drive circuit...
Battery models play important roles in battery manufacturing, design, safe operation, and many of its applications, such as in providing power sources of electric vehicles due to the high energy density, long life, and high cell voltage. Unlike the detection of impedance spectrum in a short linear interval, the I-V characteristic of lithium-ion batteries presents strongly nonlinearity such as the...
In this paper, the resource sharing problem is considered for a network composed of interconnected dc nanogrids. Each nanogrid is equipped with photovoltaic (PV) energy and batteries. In order to improve the utilization of PV energy among the nanogrids, the amount decision of the sharing electricity needed to be made. An online Lyapunov-based algorithm of resource sharing among the interconnected...
The Photovoltaic-based microgrid (PV-MG) has become the core of the integration application of the photovoltaic power system, and it's the most effective ways to make use of the solar energy locally. Currently, the feed-in-tariff (FIT) policy of PV-MG in China is fixed and far below the market price, which cannot fully display and contribute to the regulation tools' impact on the business investment...
A novel coordinate control scheme for battery and super-capacitor energy storage device used in the stand-alone photovoltaic (PV) power generation system is presented in this paper. The stand-alone PV power generation system is composed of PV arrays, battery charging and discharging circuit, super capacitor charging and discharging circuit. PV arrays provide energy for the load, excess and insufficient...
The equalization speed and efficiency are the key issues of battery equalization. In order to improve the equalization performance, this paper proposes an any-cell(s)-to-any-cell(s) equalizer based on bidirectional inductor converters. With inductor converter legs connected to each lithium-ion cell polarities, this topology can transfer energy from any cell(s) to any cell(s), which results in an enhancement...
Pure Electric vehicle power supply system includes two types: single power supply system and hybrid power supply system. Control scheme of EV's hybrid power supply system is especially important since it determines system performances and life of every power supply and further impacts on EV's whole performances. As a key technology of electric vehicles (EV), researches of electric power system have...
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