- easy scaling of the number of cells in the converter and
- splitting the system into different parts to run them on a single or multiple cores. This can be done with the new Task Frames available in PLECS 4.4.
- RT Box 1 and 2 with 32 digital I/Os are able to simulate up to 5 cells, whereas
- the RT Box 3 is able to simulate up to 10 cells per arm.
The performance metric for evaluating the different RT Box targets is the average execution time per core. For the RT Box 1 and the single core operation of the RT Box 2 and 3, this means only one core is calculating the complete MMC plant model. In the case of the RT Box 2/3's multicore operation, total average execution time is calculated from the average execution time of each of the three available simulation cores.
Using the described model, different simulations are performed:
In both cases only the RT Box 3 allows simulation of up to 10 sub-cells per arm, as it has 64 digital inputs vs. 32 on the RT Box 1/2.
There is a clear performance gain with the RT Box 2/3’s 1.5 GHz processor over the 1 GHz processor in the RT Box 1. Another significant performance gain is achieved by running the plant model on different simulation cores of the RT Box 2 and 3.