Abstract
In micro grid (MG), active/reactive power sharing for all dis-patchable units is an important issue. To meet fluctuating loads’ active and reactive power demands, the units generally adopt primary P-f and Q-U droop control methods. However, at different state of charge (SOC) values, the capability of Lead Acid Battery Bank (LABB) based units to take loads varies in a large range; active power should not be shared according to the units P capacities in a constant ratio. Besides, influenced by the output and line impedance between units, reactive power is not able to be shared in proportion to the units Q capacities. Another problem, after MG power balance requirement is satisfied, frequency and voltage are deviating from their rated values thus power quality is reduced. This paper presents a new smart MG which is based on the multi agent system. To solve the problems mentioned above, P-f and Q-U droop curves are adjusted dynamically and autonomously in local agents. To improve the power quality, secondary restoration function is realized in a decentralized way, the computation tasks are assigned to local, the computation capability and communication reliability requirements for central PC are low, and operation reliability is high. Simulation results back the proposed methods.
Highlights
With the continuing large-scale consumption of fossil energy resources in thermal power stations of large power systems and the increasing efforts of government for energy saving and reducing emissions, a micro grid (MG) that has the ability to cleanly and effectively utilize renewable energy is the most promising technology to achieve this goal
For active power sharing and frequency stabilization, due to Lead Acid Battery Bank (LABB) state of charge (SOC) varies in a wide range during MG operation, at different SOC values the capabilities of energy storage system (ESS) to supply loads varies
To implement distributed secondary frequency and voltage restoration control, this paper proposes multi agent based smart MG
Summary
With the continuing large-scale consumption of fossil energy resources in thermal power stations of large power systems and the increasing efforts of government for energy saving and reducing emissions, a micro grid (MG) that has the ability to cleanly and effectively utilize renewable energy is the most promising technology to achieve this goal. For reactive power sharing and voltage stabilization, influenced by the output impedance of DGs and line impedance between DGs, DGs’ terminal voltage are not equal, so reactive power cannot be shared [10,11] To handle this issue, this paper proposes a self-adjusted variable droop curve strategy. To implement distributed secondary frequency and voltage restoration control, this paper proposes multi agent based smart MG. Active and reactive power sharing functions mentioned above are implemented in local DG agents, in which the variable droop curve algorithms are realized dynamically and autonomously.
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