A new energy system and Z-source DC-DC converter thereof

Abstract

The invention discloses a Z source DC- DC convert includes a switch module, a first diode, a second diode, a third diode, a first inductor, a second inductor, a first capacitor, a second capacitor, athird capacitor, and a fourth capacitor. As can be seen, the Z source DC-DC converter gain can achieve high gain at low duty cycle. While the cascade is not needed to realize high gain, and the complexity and cost of the circuit structure are reduced; In addition, the on-loss of the switching transistor is reduced, and the Z-source DC-DC converter efficiency; And there is only one switch modulein the Z source DC -DC converter , which is easy to control. The invention also provides a new energy source system, which comprises a Z-source DC- DC convert has that same beneficial effect.

Description

technical field [0001] The invention relates to the technical field of converters, in particular to a new energy system and a Z-source DC-DC converter thereof. Background technique [0002] With the increasingly serious energy crisis and environmental pollution, renewable energy is becoming more and more important and common worldwide, especially distributed power generation systems based on renewable energy, such as fuel cells, photovoltaic panels, etc. Due to the low voltage characteristics of photovoltaic and fuel cell units, a high-gain DC-DC converter is often required to increase the voltage before it can be connected to the grid. [0003] High-gain DC-DC converters used in the prior art often use cascaded DC-DC converters, specifically, please refer to figure 1 , figure 1 It is a structural schematic diagram of a traditional cascaded DC-DC converter. This type of converter is formed by cascading two or even multi-level boost circuits. On the one hand, the larger the...

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Problems solved by technology

[0003] High-gain DC-DC converters used in the prior art often use cascaded DC-DC converters, specifically, please refer to figure 1 , figure 1 It is a structural schematic diagram of a traditional cascaded DC-DC converter. This type of converter is formed by cascading two or even multi-level boost circuits. On the one hand, the larger the duty cycle, the energy storage inductor in this type of converter It will reach magnetic saturation, and work in the current discontinuous mode (DCM mode), which will cause large current ripples and current peaks, making it difficult to design the control loop; in addition, the higher the duty cycle, the higher the voltage stress of the switch tube. will increase, so the loss of the switch will also increase and reduce the efficiency. Therefore, this type of converter cannot work at a high duty cycle, so high gain cannot be achieved; on the other hand, this type of converter generally requires a large number of electronic components, and at least two energy conversions will increase the power damage. Therefore, this type of converter also has the disadvantages of high cost, low efficiency and complicated control, which is not conducive to the effective use of new energy

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