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Aiming at the problem of control inflexible and the control algorithm cannot take into account the quick adjustment and accurate control of hardware closed-loop feedback, PID or fuzzy control algorithm in battery testing system, we put forward fuzzy self-tuning PID control algorithm to control charging voltage of lithium ion battery, solving the problem of nonlinear time-varying charging system semaphore...
Because of high cost of battery, BESS is not suitable for the situation when the demand of active power is less than that of reactive power. A novel STATCOM based on the hybrid cascaded multilevel converter is proposed to provide limited active power support. Meanwhile, this topology doesn't have the drawback of cascaded H-bridge BESS. The characteristic of output power for this topology is studied...
This paper presents an performance improvement of neutral-point balancing using DC/DC converter. The proposed energy storage system (ESS) is composed of AC/DC three-level converter and DC/DC three-level converter. The conventional neutral-point control method is balanced by adding a duty-offset to the duty of the switches. But this paper is proposed adding additional neutral-point controller using...
Series connections of the cells of energy-storage devices such as electric double-layer capacitor (EDLC) and lithium-ion battery result in voltage imbalance in each cell because of the nonuniform properties of the individual cells. In previous work, the authors proposed a novel cell voltage equalization circuit using an LC series circuit. In the proposed circuit, the differences of the convergence...
Improvement of the cruising range is one of the main research challenges regarding fully electric vehicles, as the comparably low range is seen as one of the major disadvantages and therefore prevents sales. An optimised recuperation strategy can help to enlarge the range without an extension of the accumulator capacity. In this paper, different recuperation strategies are illustrated and discussed...
In this paper we present a solution for simulating the cranking torque and speed of an internal combustion engine for electric starter testing. The starting point is represented by the acquisition of the values involved in the cranking process: torque developed by the internal combustion engine, speed, voltage across the starter, the current drawn from the battery and the voltage at the battery terminals...
In this study, implementation of design and simulation programme of a solar energy (photovoltaic panel) supported hybrid electric vehicle was designed, which is considered to be widely used in the 21st century. In the study, DC motor was simulated for a serial hybrid electric vehicle in ICE-generator and photovoltaic panel matlab/simulink environment. Moreover, a .m file was written by calculating...
The interchange of power between power supply systems is proposed as a way to reduce the storage battery capacity required to compensate imbalances in power generation and demand. The results of simulations for calculating the expected reduction in required battery capacity in a constructed power supply system are also reported.
The penetration levels of plug-in electric vehicles (PEVs) is expected to rapidly increase within the next few years due to global trend of energy saving and environmental protection. It is well-known that uncoordinated charging of PEVs in residential distribution feeders will have significant negative impacts on grid performances causing increased losses, poor voltage regulations, network congestion...
The upper and lower limits of battery state-ofcharge(SOC) are a pair of key control parameters of hybrid electric vehicle(HEV) strategy and directly affect the fuel economy and emission performance. In this paper,a parallel HEV model was constructed by using AMESim. Under the same designed driving cycle, the fuel economy and emission performance of the vehicle with different upper-and-lower limit...
In this paper, control strategy of a plug-in 4 wheel drive car is researched. According to torque request of the car, the steady work state is classified into 10 modes, which consists of 7 drive modes and 3 brake modes. Besides, torque distribution strategy among the power components which realizes basic energy management and torque coordination control which aims at reducing shock extent when mode...
At present, there are two typical electromotive drive train system (EDTS) configurations on the market. On the one hand, there are high voltage systems for conventional cars with system voltages in the range of 400 V – 800 V. In industrial truck and fork lifter applications, there are low voltage solutions with a system voltage of 80 V. A main question at this topic is: “Which system battery voltage...
A photovoltaic (PV) array show multi local maximum power points mode under partially shaded conditions, where the operating point of the PV system tends to converge to a local maximum power point (LMPP) which is not the real maximum power point. A novel MPPT method is proposed in this paper to achieve global maximum power point tracking (GMPPT) under partially shaded conditions. The behavior of I–V...
Critical infrastructure's (CI) (electricity, heat, water, information and communication technology networks) security, stability and reliability are closely related to the interaction phenomenon. Due to the increasing amount of data transferred, increases dependence on telecommunications and internet services, the data integrity and security is becoming a very important aspect for the utility services...
Global optimization oriented energy control algorithms can improve fuel economy of HEV for certain driving cycle. But it can't be used for the other driving cycles. This paper built a adaptive energy control strategy based on driving cycle recognition. Through driving cycle and microtrip studying, analysis was made on characteristic parameters of driving cycles, based on which, ten parameters oriented...
Hybrid systems between wind, solar, batteries, hydro and diesel generation have been developed in various places. The IEEE 118-bus Test System has been modified with some generation replaced by wind, solar, hydro, batteries and diesel generation to consider the complementary strengths of each source. The system is divided into 3 areas, and in each area power is generated by one or more of the renewable...
This paper proposes a single-phase three-wire fuel-cell generation system for micro-grid. This generation system consists of two power converter stages: an isolated current-fed DC-DC converter and a three-port power converter. The three-port power converter has three input/output ports: a high-voltage DC port, a low-voltage DC port and an AC port. The fuel cell outputs a constant power regardless...
This paper presents modeling, design and analysis of a bidirectional half-bridge DC/DC converter suitable for power electronic interface between the main energy storage system and the electric traction drive in hybrid electric vehicles. A hybrid energy storage system composed of a battery unit and an ultracapacitor pack is considered. A parallel dc-linked multi-input converter with a half-bridge bidirectional...
Upon the increasing implementation of direct current (DC) power sources, energy storages and loads in power systems, DC microgrids have drawn more attention from global stakeholders. Reliable operation of DC microgrids mainly depends on proper control method to cope with bus voltage variations due to renewable sources intermittency and load changes. The main objectives of the control method are to...
One of the key issues for electric vehicle (EV) development is the energy management strategy, especially for those with hybrid energy storage systems. A fuzzy logic based energy management strategy (FEMS) is proposed in this work to determine the power split between two energy storage sources: a battery tank and an ultracapacitor tank. Fuzzy logic control is chosen because of the nonlinearity of...
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