Abstract
This paper proposes two methods to improve the performance in real-time simulation. The increased inverter-based generations are gradually shifting the operation of the power grid. Consequently, the investigation for the safe operation and further application is essential in the inverter-dominated power grid. As the simulated number of non-linear switch elements like inverter increases, the numerical complexity of the simulation model rises exponentially. Accordingly, the scale of the simulated power grid with inverters is normally constricted by taking account of the burdensome numerical calculation. The emerging of real-time simulator provides the opportunity to enable the simulation of the large-scale power grids. Nevertheless, the simulation boundary condition is still exceeded in the inverter-dominated model. Hence, the improvement of the performance to extend the limitation in real-time simulation is constituted in this paper. The first method proposed is co-simulation. This approach is to simulate the power grid and inverters by models in different deep levels. The phasor model and electrical-mechanical-transient model are utilized to develop the co-simulation model. The second method is network reduction. Based on the dynamic feature of the inverter, it is reduced to an equivalent current source, which decreases the complexity of the model and retains its characteristics. The evaluation of the methods is demonstrated by two indexes: real-time capability and the similarity degree.
Highlights
The increasing number of power electronic based devices, such as photovoltaic, wind generation device and HVDC is interfaced with the power grid [1]–[4]
Feeding renewable energy into the power system is mainly implemented in the distribution grid, and the conversion system plays a significant role, which can lead to the reduction of inertia of power system with the expending of the renewable feed-in-power [5]–[7]
It is crucial to verify that the co-simulation model and the reduced network model does not influence the accuracy of dynamic feature
Summary
The increasing number of power electronic based devices, such as photovoltaic, wind generation device and HVDC is interfaced with the power grid [1]–[4]. The other method is applied to accelerate the real-time simulation by means of network reduction [24] with the aggregated model. There exist two methods: parallel computing and the acceleration component from the RT-LAB library as the expanding the boundary of real-time simulation They still have the limitation, which is shown in this chapter. The usage of four cores by simulating ten inverters is 96.7% As another acceleration method ARTEMiS, the DEM and PM are not suitable to be applied. With implementation the parallel computing, the minimal usage value can reach up to 21.21%, which means that more AVM inverters can be simulated in real-time simulator. X. Song et al.: Research on Performance of Real-Time Simulation Based on Inverter-Dominated Power Grid TABLE 4. Two new methods are able to further expand the boundary condition of using eMEGASIM: Co-simulation and network reduction
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