Topology of bidirectional converter for energy storage

What is a bi-directional converter?

Bi-directional converters use the same power stage to transfer power in either direction in a power system. This helps reduce peak demand tariff, reduces load transients, and enables quick changes in the direction of power transfer. They have high efficiency, up to 97% at power levels up to 22KW.

What is a bidirectional DC-DC converter?

Bidirectional DC-DC converters (BDCs) are certainly an important power electronic converter for managing bidirectional power flow in various applications. It offers the ability to flow power in both directions, which is useful in systems with renewable energy sources and energy storage.

What are the benefits of using bi-directional converters?

Bi-directional converters reduce peak demand tariff, reduce load transients, and provide V2G capabilities with quick power transfer direction changes. They also offer high efficiency (>97%) at power levels up to 22KW. These converters use the same power stage to transfer power in either direction in a power system.

What are typical isolated bidirectional DC–DC topologies?

This section compares typical isolated bidirectional DC–DC topologies from six aspects: power source side current ripple, voltage and current stresses, power density, number of devices, and transformer winding design. The distribution of indexes for seven typical isolated bidirectional DC–DC topologies are summarized in Table 5. Table 5.

Why is a bidirectional power converter important?

Therefore, it is very important to have an advanced bidirectional interface between the grid and the source to maintain the quality of power supply. AC/DC bidirectional power converter is one of the major and an essential component in the bidirectional link.

What is bidirectional DC–DC topology based on VM?

The bidirectional DC–DC topology based on VM uses two capacitors to transmit energy and can multiply the low-voltage side voltage, as shown in Fig. 10. Thus, bidirectional VM impedance network is suitable as high-voltage side structure of bidirectional DC–DC converter for HESS. Fig. 10. Bidirectional DC–DC impedance network based on VM.