AC / DC hybrid auxiliary power supply module of energy storage converter

Abstract

The utility model discloses an AC / DC hybrid auxiliary power supply module of an energy storage converter, comprising a power supply path switching control unit which is respectively connected with a power supply module and a voltage regulation module. The power supply path switching control unit is connected with at least two of the external UPS power supply unit, the AC power supply unit and the DC power supply unit. The alternating current power supply unit, the direct current power supply unit and the external UPS power supply unit are all provided with voltage detection modules, the design structure is reasonable, through the alternating current power supply unit, the direct current power supply unit and the external UPS power supply unit, various power supply modes can be switched to different power supply units in different voltage states, and the power supply efficiency is improved. And after the voltage regulation module regulates the voltage to a proper voltage, power is supplied to a post-stage circuit, so that the problem that when the input voltage suddenly changes, a control circuit, a detection circuit, a protection circuit and the like lose power supply at present, and large potential safety hazards exist in safe operation of an energy storage system is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to alternating current technology field, specifically is a kind of AC / DC hybrid auxiliary power module of energy storage converter. BACKGROUND

[0002] Energy storage converter (PCS) is the core equipment connected between battery system and power grid or AC load, responsible for realizing the bidirectional conversion of electric energy, it can convert the DC power of battery into AC power to supply power grid or AC load, also can rectify the AC power of power grid into DC power to charge battery;Energy storage converter includes bidirectional AC / DC power module, control module, measurement module, auxiliary power module and protection module, wherein, auxiliary power supply can ensure the stable operation of energy storage system, realize the key elements of efficient bidirectional conversion and storage of electric energy, optimization battery pack management, flexible response to power demand change and support intelligent power grid and microgrid development.

[0003] At present, auxiliary power supply in energy storage converter mostly uses AC or DC power supply, and in energy storage converter, grid input voltage fluctuation, DC bus overvoltage or undervoltage will affect the stable operation of auxiliary power supply;Energy storage system needs to have the ability to operate in off-grid condition, so when input voltage suddenly changes, the system cannot react in time and switch to standby power supply, auxiliary power supply will stop working, and then lead to the loss of power supply of control circuit, detection circuit and protection circuit, which has great safety hazard to the safe operation of energy storage system, therefore, we provide AC / DC hybrid auxiliary power module of energy storage converter to solve the above problems. UTILITY MODEL CONTENTS

[0004] The utility model aims at making up for the deficiency of prior art, and provides an AC / DC hybrid auxiliary power module of energy storage converter.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] An AC / DC hybrid auxiliary power module of energy storage converter, comprising a power supply path switching control unit, the power supply path switching control unit is connected with a power supply module and a voltage regulation module respectively, the voltage regulation module is connected with a power consumption unit of energy storage converter, and is used for regulating input voltage to be suitable for the voltage of power consumption unit of energy storage converter;

[0007] The power supply module at least includes an external UPS power supply unit, an AC power supply unit and a DC power supply unit;

[0008] The power supply path switching control unit is connected with at least two of the external UPS power supply unit, the AC power supply unit and the DC power supply unit respectively, for switching the power supply unit meeting power supply condition to supply power to the power consumption unit of energy storage converter;

[0009] The voltage detection module is arranged on the external UPS power supply unit, the AC power supply unit and the DC power supply unit, and is used for detecting the voltage of each power supply unit.

[0010] Further, the three-phase rectification module is arranged on the connecting line between the AC power supply unit and the power supply path switching control unit.

[0011] Further, the power supply path switching control unit comprises a first circuit switching unit and a second circuit switching unit.

[0012] The external UPS power supply unit is connected with the voltage regulation module through the second circuit switching unit.

[0013] The AC power supply unit and the DC power supply unit are connected with the first circuit switching unit respectively, and the first circuit switching unit is connected with the second circuit switching unit.

[0014] Further, the first circuit switching unit is a first relay or a diode switching circuit.

[0015] Further, the second circuit switching unit is a second relay.

[0016] Further, the voltage regulation module is a flyback converter with a plurality of MOS tubes connected in cascade.

[0017] Further, the external UPS power supply unit is a photovoltaic power generation energy storage battery.

[0018] Compared with the prior art, the AC / DC hybrid auxiliary power supply module of the energy storage converter has the following beneficial effects:

[0019] The AC power supply unit, the DC power supply unit and the external UPS power supply unit are used to switch to different power supply units under different voltage states, and the voltage is adjusted to an appropriate voltage by the voltage regulation module to supply power to the subsequent circuit, thereby ensuring the reliable operation of the auxiliary power supply. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 Fig. 1 is a connection diagram of the AC / DC hybrid auxiliary power supply module of the utility model;

[0021] Fig. 2 Fig. 2 is a power supply circuit switching flow chart of the AC / DC hybrid auxiliary power supply module of the utility model.

[0022] 1, external UPS power supply unit; 2, AC power supply unit; 3, DC power supply unit; 4, three-phase rectifier module; 5, first circuit switching unit; 6, second circuit switching unit; 7, voltage regulation module; 8, power unit. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] As shown in Figs. 1-2 The present application provides a technical solution: an AC-DC hybrid auxiliary power module of an energy storage converter, comprising a power supply path switching control unit, the power supply path switching control unit is connected with a power supply module and a voltage regulation module 7 respectively, the voltage regulation module 7 is connected with a power unit 8 of the energy storage converter, and is used for regulating the input voltage to be suitable for the voltage of the power unit 8 of the energy storage converter;

[0025] The power supply module at least comprises an external UPS power supply unit 1, an AC power supply unit 2 and a DC power supply unit 3;

[0026] The power supply path switching control unit is connected with at least two of the external UPS power supply unit 1, the AC power supply unit 2 and the DC power supply unit 3 respectively, and is used for switching the power supply unit meeting the power supply condition to supply power to the power unit 8 of the energy storage converter;

[0027] The external UPS power supply unit 1, the AC power supply unit 2 and the DC power supply unit 3 are all provided with a voltage detection module for detecting the voltage of each power supply unit;

[0028] A three-phase rectifier module 4 is arranged on the connection line between the AC power supply unit 2 and the power supply path switching control unit; specifically, the three-phase rectifier module 4 is a common three-phase rectifier circuit in the art, which is used for rectifying the input AC voltage.

[0029] The power supply path switching control unit comprises a first circuit switching unit 5 and a second circuit switching unit 6;

[0030] The external UPS power supply unit 1 is connected with the voltage regulation module 7 through the second circuit switching unit 6;

[0031] The AC power supply unit 2 and the DC power supply unit 3 are connected with the first circuit switching unit 5 respectively, and the first circuit switching unit 5 is connected with the second circuit switching unit 6;

[0032] In use, the alternating current power supply unit 2 and the direct current power supply unit 3 are connected with the first circuit switching unit 5, and the connecting line between the alternating current power supply unit 2 and the first circuit switching unit 5 is provided with the three-phase rectification module 4, the output end of the first circuit switching unit 5 is connected with one input end of the second circuit switching unit 6, the other input end of the second circuit switching unit 6 is connected with the external UPS power supply unit 1, the output end of the second circuit switching unit 6 is connected with the voltage regulation module 7, the voltage regulation module 7 is connected with the power unit 8 of the energy storage converter, when the voltage fluctuation or the battery voltage is insufficient to provide reliable input, the corresponding alternating current power supply unit 2 / direct current power supply unit 3 / external UPS power supply unit 1 is selected to supply power according to the first circuit switching unit 5 and the second circuit switching unit 6, and after the voltage is adjusted to the appropriate voltage by the voltage regulation module 7, the power unit 8 is supplied with power; the power unit 8 at least includes the acquisition module and the control module of the energy storage converter.

[0033] The first circuit switching unit 5 is a first relay or a diode switching circuit;

[0034] The second circuit switching unit 6 is a second relay;

[0035] The external UPS power supply unit 1 is a photovoltaic power generation energy storage battery;

[0036] In use, the external UPS can adopt the combination of external photovoltaic solar panels and energy storage batteries; at the same time, the voltage regulation module 7 is a flyback converter with multiple MOS tubes connected in cascade, which improves the safe operation of the auxiliary power supply in high and low voltage crossing; in order to guarantee the reliability and stability of the auxiliary power supply of the energy storage converter, and further avoid the safety hazards caused by the lack of power supply of the acquisition module and the control module when the energy storage converter is working.

[0037] In the medium voltage voltage level, the first circuit switching unit 5 is a first relay;

[0038] The second circuit switching unit 6 is a second relay;

[0039] In use, the UPS full name is uninterrupted power supply, English: Uninterruptible Power Supply, is an important device for providing stable and uninterrupted power supply for load equipment; the first mode is suitable for the medium voltage energy storage converter alternating current port voltage of 1kV to 35kV, wherein the alternating current power supply unit 2 is connected to the primary side of the isolation transformer, the secondary side is connected to the rectification module, the rectification module output is connected to the voltage regulation module 7, the voltage regulation module 7 converts the voltage to the appropriate voltage and then supplies power to the subsequent circuit, and the first relay and the second relay are connected therein to select the appropriate power supply unit according to the specific state of the power supply unit.

[0040] The specific control switching principle is:

[0041] When the system starts running, first confirm the relay state of the auxiliary power supply circuit, and then collect the voltage of the AC power supply unit 2, the DC power supply unit 3 and the external UPS power supply unit 1;

[0042] If the auxiliary power supply is normal, judge the voltage of the AC power supply unit 2 and the DC power supply unit 3:

[0043] When the AC power supply unit 2 voltage is greater than the DC power supply unit 3 voltage, control the first relay to switch the auxiliary power supply circuit to the AC power supply unit 2, and vice versa to the DC power supply unit 3;

[0044] If the AC power supply unit 2 and the DC power supply unit 3 both appear abnormal, control the second relay to switch the auxiliary power supply circuit to the external UPS for power supply.

[0045] In the low voltage level, the first circuit switching unit 5 is a diode switching circuit, and the second circuit switching unit 6 is a second relay;

[0046] The specific control switching principle is:

[0047] When the DC and AC sides can meet the normal power supply:

[0048] If the AC power supply unit 2 voltage is higher than the DC power supply unit 3 voltage, the diode is not conductive, and AC power supply is adopted;

[0049] If the voltage of the DC power supply unit 3 is higher than the voltage of the AC power supply unit 2:

[0050] And meet the diode conduction voltage, the diode is conductive, and the DC power supply is adopted; otherwise, the diode is not conductive, and the AC power supply is adopted:

[0051] When the AC power supply unit 2 and the DC power supply unit 3 are both less than the minimum working voltage of the auxiliary power supply, the second relay is actively switched, and the external UPS power supply is adopted.

[0052] According to different voltage levels, the corresponding first circuit switching unit 5 is selected, and when the diode switching circuit is used, the voltage of the AC power supply unit 2 and the DC power supply unit 3 does not need to be judged, the automatic switching of the power supply circuit is realized, the switching efficiency is higher, the cost is reduced, and the reliability and stability of the auxiliary power supply are ensured.

Claims

1. An AC / DC hybrid auxiliary power module of an energy storage converter, characterized in that: The power supply path switching control unit is connected with the power supply module and the voltage regulation module (7) respectively, the voltage regulation module (7) is connected with the power consumption unit (8) of the energy storage converter, and the voltage regulation module (7) is used for regulating the input voltage to the voltage suitable for the power consumption unit (8) of the energy storage converter; The power supply module at least includes an external UPS power supply unit (1), an alternating current power supply unit (2) and a direct current power supply unit (3); The power supply path switching control unit is connected with at least two of the external UPS power supply unit (1), the alternating current power supply unit (2) and the direct current power supply unit (3), and is used for switching the power supply unit meeting the power supply condition to supply power to the power consumption unit (8) of the energy storage converter; The external UPS power supply unit (1), the alternating current power supply unit (2) and the direct current power supply unit (3) are all provided with voltage detection modules for detecting the voltage of each power supply unit.

2. The AC / DC hybrid auxiliary power module of the energy storage converter of claim 1, wherein: The connection line between the alternating current power supply unit (2) and the power supply path switching control unit is provided with a three-phase rectification module (4).

3. The AC / DC hybrid auxiliary power module of the energy storage converter of claim 1, wherein: The power supply path switching control unit includes a first circuit switching unit (5) and a second circuit switching unit (6); The external UPS power supply unit (1) is connected with the voltage regulation module (7) through the second circuit switching unit (6); The alternating current power supply unit (2) and the direct current power supply unit (3) are connected with the first circuit switching unit (5) respectively, and the first circuit switching unit (5) is connected with the second circuit switching unit (6).

4. The AC / DC hybrid auxiliary power module of the energy storage converter of claim 3, wherein: The first circuit switching unit (5) is a first relay or a diode switching circuit.

5. The AC / DC hybrid auxiliary power supply module of the energy storage inverter according to claim 3, characterized in that: The second circuit switching unit (6) is a second relay.

6. The AC / DC hybrid auxiliary power supply module of the energy storage inverter according to claim 1, characterized in that: The voltage regulation module (7) is a flyback converter with a plurality of MOS tubes connected in cascade.

7. The AC / DC hybrid auxiliary power supply module of the energy storage inverter according to claim 1, characterized in that: The external UPS power supply unit (1) is a photovoltaic power generation energy storage battery.

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