**4. System Composition for Power Quality Analysis**

Figure 9 represents the configuration of MCFC system so that we can monitor and analyses frequency stabilization time as well as the voltage fluctuation rate and frequency fluctuation rate which can occur in the process of synchronizing the other power sources, such as ESS and diesel generator.

**Figure 9.** Overall system configuration for power quality analysis.

As shown in the figure, the overall system is designed for power quality analysis which is to measure the voltage, current, power, frequency, and power factor generated during power conversion through the synchronous test, thereby to evaluate the suitability of the combined power source to a marine vessel.

Figure 10 shows the monitoring system configuration for power quality analysis. We could monitor power data (voltage, current, frequency, voltage variation, frequency variation, apparent/active/reactive power and power factor) in real time and store them on the LabVIEW interface.

**Figure 10.** Monitoring system configuration for power quality analysis.

Twelve channels of the measuring points were assigned on MCFC, ESS and secondary power supply R, T of diesel generator. A high-voltage probe (TP0200) was used for the measurement as pictured in Figure 11, whereas a current measuring clamp i410 type was applied, as shown in Figure 12.

**Figure 11.** Installed voltage measuring equipment.

**Figure 12.** Installed current measuring equipment.
