4.5.3. Scenario 3

When a limitation occurs, operations on machine M1 are completed. On the remaining machines, individual operations are started or the machines are set to "Idle". In this scenario, the production was subject to maximum utilization of the bottleneck of the process (i.e., machine M3). Machine M3 should therefore be run continuously to ensure that its productivity is at the highest level. Note that the power allocation priors for a given machine should also be set on the machines upstream of the bottleneck. This means that the bottleneck is continuously provided with semi-finished products for production. Continuity of operation of machine M3 was maintained in two variants with a power reduction of 5 or 10 kW. In the other variants, there was an interruption to the production operations. With the 20 kW available power reduction, all production operations on machines were stopped and only the readiness of machines to work was maintained. Figure 6 presents power consumption, depending on the realized production schedule, for four variants of the size of the power consumption limitation. The red box indicates the times of power limitation. There was a clear decrease in the frequency and diversity of technological operations.

**Figure 6.** Power consumption and production schedule for scenario 3.

Table 9 shows the factors of the production process for different power limitations.

**Table 9.** Production process factors for scenario 3.


Increasing the amount of the power constraint increased the process execution time by 3 min (with the 5 kW available power reduction) to 113.4 min (with the 20 kW available power reduction). Of all the scenarios presented, this one had the shortest process execution extension. It also resulted in the lowest increase in electricity consumption in the production cell, which ranged from 0.71 kWh (variant 1) to 28.29 kWh (variant 4) with respect to the base state (Table 6). With the increase in the reduction in power consumption, the efficiency of individual machines decreased. However, the efficiency values for the first few variants were significantly higher than in the previous scenarios. The maximum utilization of machine M3 decreased from the value of 94.70% (with the 5 kW available power reduction) to the value of 76.56% (with the 20 kW available power reduction).
