Abstract
It is a very crucial problem to make a microgrid operated reasonably and stably. Considering the nonlinear mathematics model of inverter established in this paper, the input-output feedback linearization method is used to transform the nonlinear mathematics model of inverters to a linear tracking synchronization and consensus regulation control problem. Based on the linear mathematics model and multiagent consensus algorithm, a decentralized coordinated controller is proposed to make amplitudes and angles of voltages from inverters be consensus and active and reactive power shared in the desired ratio. The proposed control is totally distributed because each inverter only requires local and one neighbor’s information with sparse communication structure based on multiagent system. The hybrid consensus algorithm is used to keep the amplitude of the output voltages following the leader and the angles of output voltage as consensus. Then the microgrid can be operated more efficiently and the circulating current between DGs can be effectively suppressed. The effectiveness of the proposed method is proved through simulation results of a typical microgrid system.
Highlights
More and more AC and DC distributed generations (DGs) are connected to the systems which requires more flexible and modular control systems
Many control methods for such a microgrid system are proposed which can be categorized as centralized control [1, 2] and decentralized control [3,4,5,6]
Both of the two control methods are based on the conventional droop control [7,8,9,10]
Summary
More and more AC and DC distributed generations (DGs) are connected to the systems which requires more flexible and modular control systems. Hybrid multiagent consensus algorithm is used to address the tracking synchronization problem about amplitudes of output voltages and the consensus regulation problem about angles by using the input-output feedback linearization This method is superior to the scalar control by which only amplitudes of the voltage are controlled. A decentralized coordinated controller based on angle-active power droop control and voltage-reactive power droop control is designed to make active and reactive power shared proportionally and suppress circulating currents between DGs. The multiagent consensus algorithm is used to calculate the deviation of angle and amplitudes between inverters by using the leaderless consensus algorithm and the leader consensus algorithm. (1) By using feedback linearization method combined with hybrid multiagent consensus algorithm, the power can be shared proportionally and the angles and amplitudes of output voltage can be kept consensus.
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