4.1 Minimization of power loss in faulty condition with balanced power sharing between the two three-phase windings {1} and {2}
Balanced current sharing between the two three-phase windings {1} and {2} can be realized in post-fault con¬ditions by simply setting ki = 1/2. Power (voltage) sharing co-efficient kv(2) to synthesize v(2) between inverters VSIH(2) and VSIL(2).
Subsequently, the usage of VSIH(2) and VSIL(2) allows not an optimal from the point of inverter losses, when the desired output voltage can be synthesized with just one VSIH(2) or VSIL(2). Therefore, inverters VSIH(1) can propagate with just VSIH(2) and VSIL(2) set to zero voltage output or vice versa providing exactly the same operating characteristics. Now, the open-end windings configu¬ration collapse to three-phase star connections for both windings {1} and {2} represented by the space vector equivalent circuit in Figure 5b.
Voltage and power given by Eqs.10, Eqs.11 and the post-fault condition Eqs.12, can further predicted as:
,
(17)
.
(18)
The prediction (Eqs. 17) will be formulated in numerical simulations to rep¬resent the redundancy in post-fault con¬di¬tions by avoiding additional protective circuitry (bypass switches/circuit breakers). This will ensures the star connection on the inverter VSIL(2) redundancy and also makes zero circulating current with dc supply.
4.2 Balanced power sharing among the healthy VSIH(1) and VSIH(2), VSIL(2)
Next step in investigation focused on towards the post-fault operating condition in sharing equally the total power among the three healthy inverters (VSIH(1) and VSIH(2), VSIL(2)). This post-fault behavior is crucial issues and recom¬mended for battery s...
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Siwakoti P.Y., Graham E.T., Design of FPGA-controlled Power Electronics and Drives Using MATLAB Simulink, Macquarie University, Australia, 571- 577, 2013.
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