Abstract
The increasing penetration of inverter-based distributed generations (DGs) significantly affects the fault characteristics of distribution networks. Fault analysis is a keystone for suitable protection scheme design. This paper presents the modelling methodology for distribution networks with inverter-based DGs and performs fault simulation based on the model. Firstly, a single inverter-based DG model based on the cascaded control structure is developed. Secondly, a simulation model of distribution network with two inverter-based DGs is established. Then, different fault simulations are performed based on the Real Time Digital Simulator (RTDS). Theoretical analyses are conducted to justify the simulation results, including the equivalent circuit of distribution networks with inverter-based DGs and the solution method for loop currents.
Highlights
In recent years, different kinds of distributed generation (DG) are being connected in distribution networks, such as wind generation and photovoltaic (PV) generation
A great number of power electronic devices are connected to distribution networks due to the integration of inverter-based DGs
As a real-time simulation tool designed for power system, Real-Time Digital Simulator (RTDS) are widely used for power system simulation and analysis [6,7,8,9]
Summary
Different kinds of distributed generation (DG) are being connected in distribution networks, such as wind generation and photovoltaic (PV) generation. Compared with traditional distribution network, planning and design, control and protection, simulation and analysis for distribution networks with inverter-based DGs are more complicated This has motivated a considerable number of studies [1,2,3,4,5]. How to model DG under fault conditions is a prerequisite for fault analysis of the distribution networks with DGs. Researchers have put forward different equivalent models of inverter-based DG to analyze their fault characteristics, such as the current source with a parallel changeable impedance [10], the voltage source with a series changeable impedance [11], and the current source controlled by positive sequence voltage at common coupling point (PCC) [12].
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