Dynamic interleaving parallel circuit and hydrogen production equipment

Abstract

The utility model discloses a dynamic interleaving parallel circuit and hydrogen production equipment. The circuit comprises an AC / DC converter, an AC side input switch, an AC filter inductor, an AC filter capacitor, a DC filter capacitor, a DC / DC converter, a DC filter inductor, a DC output filter capacitor and a controller, the input end of the AC / DC converter is connected with the AC filter inductor and the AC filter capacitor; the alternating current filter inductor and the alternating current filter capacitor are connected with a mains supply through the alternating current side switch to serve as the input end of the AC / DC converter; the direct current filter capacitor is connected with the direct current end of the AC / DC converter to serve as the first-stage output end of the dynamic interleaving parallel circuit; the input end of the DC / DC converter is connected with the DC filter capacitor; the DC / DC side of the circuit can realize automatic switching in the full-range change process of the direct-current load according to the load change, the current ripple is low, the efficiency is high, and the output requirement of the hydrogen production load on the power supply is met.

Description

Technical Field

[0001] The utility model relates to the field of direct current power supply applications, in particular to a dynamic staggered parallel circuit and hydrogen production equipment. Background Art

[0002] High-power hydrogen production power supply is an emerging direction in the current new energy field. Its requirements include: high power level, usually MW level, DC load characteristics, wide voltage variation range, and high current output ripple requirements; the existing hydrogen production power supply is used in wind power converters and high-power photovoltaic inverter products, which need to meet the requirements of high-power conversion; it is used in energy storage products or charging power products to meet the requirements of high-performance output at the DC end. When the existing hydrogen production power supply achieves full voltage or full power range output, its current ripple is high and the efficiency is low. The current amplitude and current ripple on the DC / DC side cannot change according to the load change, and cannot meet the output requirements of the hydrogen production load for the power supply. Utility Model Content

[0003] The technical problem to be solved by the utility model is to propose a dynamic interleaved parallel circuit, the DC / DC side of which can realize automatic switching during the full range of changes of the DC load according to the load changes, with low current ripple and high efficiency, and meet the output requirements of the hydrogen production load for the power supply.

[0004] In order to solve the above technical problems, the utility model provides a dynamic interleaved parallel circuit, including an AC / DC converter, an AC side input switch Q F , AC filter inductor L PFC , AC filter capacitor C ac , DC filter capacitor C dc , DC / DC converter, DC filter inductor group, DC output filter capacitor C o and controller; the AC / DC converter input terminal and the AC filter inductor L PFC , AC filter capacitor C ac Connection: AC filter inductor L PFC , AC filter capacitor C ac The AC side input switch QF is connected to the mains power supply as the input end of the AC / DC converter; the DC filter capacitor C dc The DC end of the AC / DC converter is connected to the first-stage output end of the dynamic interleaved parallel circuit; the DC / DC converter input end is connected to the DC filter capacitor C dc Connection; the DC filter inductor group, DC output filter capacitor C o The output end of the DC / DC converter is connected as the second-level output end of the dynamic interleaved parallel circuit, and the controller is connected to the switch device driving signal end of the AC / DC converter and the DC / DC converter.

[0005] Preferably, the DC / DC converter comprises N Buck bridge arms composed of IGBT devices, the N Buck bridge arms are connected in parallel to form a DC step-down circuit, the DC filter inductor group comprises N DC filter inductors, the first end of each DC filter inductor is connected to the midpoint of the corresponding N Buck bridge arms, the second end of each DC filter inductor is connected in series as one end of the second-stage output of the dynamic interleaved parallel circuit, and one end of the N Buck bridge arms is connected together as two ends of the second-stage output of the dynamic interleaved parallel circuit.

[0006] Preferably, the AC / DC converter is a three-phase rectifier circuit using IGBT devices.

[0007] Preferably, the AC side input switch Q F It is a component that closes and disconnects according to a control signal; the AC side input switch has at least three groups of normally open contacts.

[0008] Preferably, after the AC side input switch is closed, the AC / DC converter works to charge the DC filter capacitor Cdc and stabilize the voltage V at the first stage output terminal. dc After the AC / DC converter works stably, the controller issues a control instruction according to the load condition to control the Buck bridge arm corresponding to the DC / DC converter to work and supply power to the load.

[0009] Preferably, the controller includes an AC side controller and a DC side controller, the AC side controller is connected to the drive signal terminal of the IGBT device of the AC / DC converter, and the DC side controller is connected to the drive signal terminal of the IGBT device of the DC / DC converter.

[0010] In order to solve the above technical problems, the utility model also provides a hydrogen production device, which includes the dynamic interleaved parallel circuit described above.

[0011] After adopting the above circuit, the dynamic interleaved parallel circuit includes an AC / DC converter, an AC side input switch Q F , AC filter inductor L PFC , AC filter capacitor C ac , DC filter capacitor C dc , DC / DC converter, DC filter inductor group, DC output filter capacitor C o and controller; the AC / DC converter input terminal and the AC filter inductor L PFC , AC filter capacitor C ac Connection: AC filter inductor L PFC , AC filter capacitor C acThe AC side input switch QF is connected to the mains power supply as the input end of the AC / DC converter; the DC filter capacitor C dc The DC end of the AC / DC converter is connected to the first-stage output end of the dynamic interleaved parallel circuit; the DC / DC converter input end is connected to the DC filter capacitor C dc Connection; the DC filter inductor group, DC output filter capacitor C o The controller is connected to the output end of the DC / DC converter as the second-level output end of the dynamic interleaved parallel circuit, and is connected to the switch device drive signal end of the AC / DC converter and the DC / DC converter; the DC / DC side of the dynamic interleaved parallel circuit can realize automatic switching during the full range of changes of the DC load according to the load change, with low current ripple and high efficiency, meeting the output requirements of the hydrogen production load for the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the overall circuit diagram of the dynamic interleaved parallel circuit of the utility model. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0014] Embodiment 1

[0015] See also Figure 1 , Figure 1 It is the overall circuit diagram of the dynamic interleaved parallel circuit of the utility model;

[0016] This embodiment discloses a dynamic interleaved parallel circuit, including an AC / DC converter 10, an AC side input switch Q F , AC filter inductor L PFC , AC filter capacitor C ac , DC filter capacitor C dc , DC / DC converter 20, DC filter inductor group 30, DC output filter capacitor C o and controller; the AC / DC converter input terminal and the AC filter inductor L PFC , AC filter capacitor C ac Connection: AC filter inductor L PFC , AC filter capacitor C ac The AC side input switch QF is connected to the mains power supply as the input end of the AC / DC converter; the DC filter capacitor C dcThe DC end of the AC / DC converter is connected to the first-stage output end of the dynamic interleaved parallel circuit; the DC / DC converter input end is connected to the DC filter capacitor C dc Connection: DC filter inductor group 30, DC output filter capacitor C o The output end of the DC / DC converter is connected as the second-level output end of the dynamic interleaved parallel circuit, and the controller is connected to the switch device driving signal end of the AC / DC converter and the DC / DC converter.

[0017] Embodiment 2

[0018] This embodiment is based on the first embodiment. In this embodiment, the DC / DC converter includes N Buck bridge arms composed of IGBT devices, and the N Buck bridge arms are connected in parallel to form a DC step-down circuit. The DC filter inductor group includes N DC filter inductors, and the first end of each DC filter inductor is connected to the midpoint of the corresponding N Buck bridge arms. The second end of each DC filter inductor is connected in series as one end of the second-stage output of the dynamic interleaved parallel circuit, and one end of the N Buck bridge arms is connected together as two ends of the second-stage output of the dynamic interleaved parallel circuit.

[0019] The AC / DC converter is a three-phase rectifier circuit using IGBT devices.

[0020] After the AC side input switch is closed, the AC / DC converter works to provide the DC filter capacitor C dc Charge and stabilize the voltage V at the output of the first stage dc After the AC / DC converter works stably, the controller issues a control instruction according to the load condition to control the Buck bridge arm corresponding to the DC / DC converter to work and supply power to the load.

[0021] The overall working process of the dynamic interleaved parallel circuit is as follows: after power-on, the controller detects basic information such as the grid voltage amplitude and frequency, and then the controller issues a control command to close the AC side input switch Q F Then the controller outputs the control to operate the AC / DC converter to stabilize the voltage V at the first output end according to the preset voltage command. dc At preset value;

[0022] Waiting for the first level DC voltage V dc After stabilization, the controller turns on the DC / DC converter and provides real-time feedback on the load situation. It calculates the corresponding duty cycle D, the relationship between the ripple △i0 and the number of parallel Buck bridge arms N based on the load demand. It obtains the drive signal for turning on the corresponding Buck bridge arm based on the calculated data, controls the operation of the corresponding Buck bridge arm, and finally achieves that the DC side current amplitude and current ripple meet the output demand within the full range.

[0023] Embodiment 3

[0024] This embodiment is based on the first embodiment. In this embodiment, the AC side input switch Q F It is a component that closes and disconnects according to a control signal; the AC side input switch has at least three groups of normally open contacts.

[0025] Embodiment 4

[0026] This embodiment is based on the second embodiment. In this embodiment,

[0027] The controller includes an AC side controller and a DC side controller, the AC side controller is connected to the drive signal end of the IGBT device of the AC / DC converter, and the DC side controller is connected to the drive signal end of the IGBT device of the DC / DC converter; the AC side controller and the DC side controller are connected to the host computer through a communication module.

[0028] Embodiment 5

[0029] This embodiment discloses a hydrogen production device, which includes the dynamic interleaved parallel circuit described in any one of Embodiments 1 to 4.

[0030] The DC / DC side of the dynamic interleaved parallel circuit can realize automatic switching during the full range of DC load changes according to load changes, with low current ripple and high efficiency, meeting the output requirements of the hydrogen production load for power supply.

[0031] It should be understood that the above are only preferred embodiments of the present invention, and the patent scope of the present invention cannot be limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dynamic interleaved parallel circuit, characterized in that: Including AC / DC converter, AC side input switch Q F , AC filter inductor L PFC , AC filter capacitor C ac , DC filter capacitor C dc , DC / DC converter, DC filter inductor group, DC output filter capacitor C o and controller; the AC / DC converter input terminal and the AC filter inductor L PFC , AC filter capacitor C ac Connection: AC filter inductor L PFC , AC filter capacitor C ac The AC side input switch QF is connected to the mains power supply as the input end of the AC / DC converter; the DC filter capacitor C dc The DC end of the AC / DC converter is connected to the first-stage output end of the dynamic interleaved parallel circuit; the DC / DC converter input end is connected to the DC filter capacitor C dc Connection; the DC filter inductor group, DC output filter capacitor C o The output end of the DC / DC converter is connected as the second-level output end of the dynamic interleaved parallel circuit, and the controller is connected to the switch device driving signal end of the AC / DC converter and the DC / DC converter.

2. The dynamic interleaved parallel circuit according to claim 1, characterized in that: The DC / DC converter includes N Buck bridge arms composed of IGBT devices, the N Buck bridge arms are connected in parallel to form a DC step-down circuit, the DC filter inductor group includes N DC filter inductors, the first end of each DC filter inductor is connected to the midpoint of the corresponding N Buck bridge arms, the second end of each DC filter inductor is connected in series as one end of the second-stage output of the dynamic interleaved parallel circuit, and one end of the N Buck bridge arms is connected together as two ends of the second-stage output of the dynamic interleaved parallel circuit.

3. The dynamic interleaved parallel circuit according to claim 2, characterized in that: The AC / DC converter is a three-phase rectifier circuit using IGBT devices.

4. The dynamic interleaved parallel circuit according to claim 1, characterized in that: The AC side input switch Q F It is a component that closes and disconnects according to a control signal; the AC side input switch has at least three groups of normally open contacts.

5. The dynamic interleaved parallel circuit according to claim 2, characterized in that: After the AC side input switch is closed, the AC / DC converter works to charge the DC filter capacitor Cdc and stabilize the voltage Vdc at the first-stage output end; after the AC / DC converter works stably, the controller issues a control instruction according to the load condition to control the Buck bridge arm corresponding to the DC / DC converter to work and supply power to the load.

6. The dynamic interleaved parallel circuit according to claim 3, characterized in that: The controller includes an AC side controller and a DC side controller. The AC side controller is connected to a driving signal end of an IGBT device of an AC / DC converter, and the DC side controller is connected to a driving signal end of an IGBT device of a DC / DC converter.

7. A hydrogen production device, characterized in that: It comprises the dynamic interleaved parallel circuit described in any one of claims 1 to 6.

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