## 5 Simulation Results
### Analysis of the Full Range Compensation Effect of RMVSC-STATCOM  
To demonstrate the continuous and bidirectional compensation capabilities of RMVSC-STATCOM within its rated range, this simulation settings varying reactive loads--both inductive and capacitive--to verify the effectiveness of reactive power compensation across the full operational spectrum. The maximum reactive power that RMVSC-STATCOM can absorb or generate is 10 Mvar. Initially, a capacitive load of 10 Mvar is applied. At 1 s, the load is reduced to 5 Mvar. At 2 s, the load type is switched to an inductive load of 10 Mvar, and at 3 s, it is reduced to 5 Mvar.  
Reactive power tracking, power factor waveform, secondary current tracking, and dc voltage waveform under full-range compensation operation are shown in Figure 12. Initially, the inductive reactive load is 10 Mvar, and the RMVSC-STATCOM is activated at 0 s. The power factor on the power supply side increases from 0.898 to nearly 1. After a response time of 0.09 s and a regulation time of 0.12 s, the reactive power compensation \(Q\) accurately tracks the reactive power reference value \(Q_{\text{ref}}\) without overshoot or error, achieving full compensation of the inductive reactive load by the RMVSC-STATCOM. At 1 s, the inductive reactive load is reduced to 5 Mvar, causing the power factor to drop to 0.980, a decrease of approximately 2%. After a response time of 0.06 s and a regulation time of 0.09 s, the reactive power compensation \(Q\) again tracks the reactive power reference value \(Q_{\text{ref}}\) without overshoot or error, restoring the power factor to nearly 1. At 2 s, the load changes to a capacitive reactive load of 10 Mvar, causing the power factor to drop to 0.912, a decrease of approximately 8.8%. The response time is 0.11 s, and the regulation time is 0.13 s. The power factor is restored to nearly 1 without overshoot or error, as the RMVSC-STATCOM fully compensates for the capacitive reactive load. At 3 s, the capacitive reactive load is reduced to 5 Mvar, causing the power factor to drop to 0.972, a decrease of approximately 2.3%. After a response time of 0.082 s and a regulation time of 0.091 s, the  
Figure 11: Simulation results of RMVSC-STATCOM in inductive operation conditions; (**a**) three-phase voltage and current waveforms before compensation; (**b**) three-phase voltage and current waveforms after compensation; (**c**) reactive power tracking; (**d**) power factor waveform.  
reactive power compensation \(Q\) once again tracks the reactive power reference value \(Q_{\text{ref}}\) without overshoot or error, restoring the power factor to nearly \(1\).  
As illustrated in Figure 12c, the reactive current \(I_{\text{q}}\) experiences minor fluctuations during the equipment start-up phase, yet it remains within acceptable limits, avoiding overcurrent conditions. Furthermore, \(I_{\text{q}}\) closely tracks the reactive current reference value \(I_{\text{qref}}\), ensuring effective full-range reactive power compensation. Concurrently, as shown in Figure 12d, the dc voltage transitions smoothly in response to varying operating conditions without inducing any surge overvoltage. These observations confirm the effectiveness of the RMVSC-STATCOM control strategy in delivering smooth, continuous, full-range reactive power compensation.