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In a dc microgrid, the bidirectional dc-ac converters are usually operated as a utility interface to control the dc bus voltage and ensure the power balance within the system. In the case of grid failure, power limiting or malfunction condition for dc-ac converters, the dc microgrid will lose its power balance unit. At that time, the distributed generations in dc system will change their operation...
DC bus voltage control is an important task in the control of a dc microgrid or hybrid ac/dc microgrid system. To improve the dc bus voltage control dynamics, traditional approaches are mainly based on feeding forward the load or source power. However, in the microgrid system with distributed dc sources and loads, the traditional feedforward based methods need remote measurement or communications...
This paper proposes a coordinated control method of the diesel generators (DGs) and battery storage system (BSS) in AC island microgrid. When the DGs run as the main power source, an auxiliary power control signal is added to the conventional droop control for BSS to prevent system collapses caused by long-time over-current of the DGs, which can improve the stability of the microgrid. To avoid short-term...
This paper has developed a hybrid PV/Battery system with the ability of grid-connected and island operating control, the objectives are to improve controllable grid-connected ability of PVs, reduce PVs output fluctuation due to changes of environmental factors such as solar intensity, regulate isolated network voltage and frequency with the participation of PVs. The converter consists of three DC/DC...
The DC bus voltage of grid-connected two-stage power converter system (PCS) is always vulnerable to abrupt change of output power. To solve this problem, the mathematical models of the converter and its control system is established firstly. The control parameters designing via classical control theory is followed. This is continued with analyzing the cause of the voltage fluctuations. Theoretical...
As the remote areas can not be connected to large electric system, using local renewable resources and a certain capacity of energy storage devices to construct a microgrid for power supply will be the only choice. This paper introduces a new energy management strategy of islanded microgrid based on power flow control. The islanded microgrid utilizes the hybrid AC/DC structure. Battery storage system...
Microgrid technology, becoming the main application form of distributed generation with high permeability, can effectively alleviate the impacts on large power grid of distributed generation. Microgrid system, as the carrier of microgrid control strategy, can provide verification platform for the research of microgrid control strategy. In this paper, an integrated microgrid system with flexible structure...
Dual mode running characters and grid-connected technology with two different structured micro turbines (MT) are compared and analyzed respectively in this paper. Firstly, the operating modes of MT are introduced briefly. Then operating characters and influence on traditional system protection are analyzed while MTs are connecting to the grid. The different dual mode schemes are compared via simulating...
A micro-grid can increase the reliability of energy supplies by disconnecting from the grid in the case of network faults or reduced power quality. The techniques that have been investigated to control micro-grids in both modes are summarized as well as those proposed to maintain stability during the transitions from one mode to the other. This paper first introduces the micro-grid planning structure...
Based on constructing different types of distributed generations and energy storage equipments, this paper simulated the dynamical characteristics of MicroGrid with several operating modes under peer to peer control strategy. Two cases were used to analyze the role of storage equipment in MicroGrid. If micro turbine generation with traditional synchronization generator was used in MicroGrid as the...
A practical reactive power/voltage control system for regional power grid is introduced in this paper. Two-level hierarchy strategy is adopted in the control system. In the regional-level control, one day is divided into 24 time intervals, in each hour, family eugenics based on evolution (FEBE) theory is used in genetic algorithm (GA) to carry out optimization calculation. Compared with convenient...
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