Abstract
This paper proposes a half-bridge voltage balancer with a new controller for bipolar DC distribution systems. The proposed control scheme consists of two cascaded Proportional Integral (PI) controls rather than one PI control for balancing the pole voltage. In order to confirm the excellence of voltage balancing performance, a typical bipolar DC distribution system including a half-bridge voltage balancer with proposed controller was analyzed by computer simulations. Experiments with a scaled prototype were also carried out to confirm the simulation results. The half-bridge voltage balancer with proposed controller shows better performance than the half-bridge voltage balancer with one PI control for balancing the pole voltage.
Highlights
DC distribution systems convert AC power into DC power via a rectifier, and supplies this power directly to the DC load
This paper proposes a half-bridge voltage balancer with a new controller for a bipolar DC
The newly developed controller consists of two cascaded Proportional Integral (PI) controls for current and voltage regulation
Summary
DC distribution systems convert AC power into DC power via a rectifier, and supplies this power directly to the DC load. DC distribution systems can avoid the use of transformers consisting of cores and coils so that the space requirements are much smaller than that of existing AC distribution systems and they can transfer a larger power capacity even if the same lines are used They do not consume reactive power and do not require frequency regulation, and only require voltage regulation. A unipolar system is proposed in the DC distribution system, which consists of positive and negative terminals, but the supply reliability is low, the structure is simple. The converters in the bipolar system can operate with relatively low-rated voltage, thereby securing converter cost competitiveness It has higher safety since the neutral terminal is grounded [8,9]. A scaled prototype of the bipolar DC distribution system was built and tested to verify the simulation results
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