Dual-input charging equipment

Abstract

The utility model discloses double-input charging equipment, which comprises a wiring assembly, a first energy storage converter, a second energy storage converter, a direct-current bus, a direct-current transformer and an energy storage battery, the output end of the wiring assembly is electrically connected with the alternating-current input end of the first energy storage converter and the alternating-current input end of the second energy storage converter at the same time, and the direct-current output end of the first energy storage converter, the energy storage battery and the first input end of the direct-current transformer are all electrically connected with the direct-current bus. The direct-current output end of the second energy storage converter is electrically connected with the second input end of the direct-current transformer; the input end of the wiring assembly is externally connected with commercial power, and the output end of the DC transformer is connected with a charging pile. According to the utility model, double-input charging is formed on the direct-current transformer to charge the load on the charging pile, and when the first energy storage converter fails, the second energy storage converter can continuously output power, so that the required power cannot be fully applied to the energy storage battery, the battery overcurrent risk is reduced, and the stable operation of the system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage charging and discharging, and in particular to a dual-input charging device. Background Art

[0002] In order to ensure that each vehicle of the user can be charged normally, the operation of the photovoltaic storage and charging system must be stable enough. The current photovoltaic storage and charging system architecture is equipped with a high-power energy storage inverter (PCS, 500KW or 630KW), and the PCS DC output and energy storage battery and DC-DC input are all connected to the DC bus. When only one battery cabinet is configured, the battery system energy is low, and the charging pile load power demand is relatively large, if the PCS suddenly fails or the power response is not timely, the entire load demand power will be instantly added to the energy storage battery, and if the fault is not restored in time, it will cause the battery system to discharge overcurrent for a long time, affecting the operation of the entire system. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a dual-input charging device, which can reduce the risk of battery overcurrent and ensure stable operation of the system when a PCS suddenly fails or the power response is not timely.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A dual-input charging device includes a wiring assembly, a first energy storage converter, a second energy storage converter, a DC bus, a DC transformer, and an energy storage battery;

[0006] The output end of the wiring assembly is electrically connected to the AC input end of the first energy storage converter and the AC input end of the second energy storage converter at the same time, the DC output end of the first energy storage converter, the energy storage battery and the first input end of the DC transformer are all electrically connected to the DC bus, and the DC output end of the second energy storage converter is electrically connected to the second input end of the DC transformer;

[0007] The input end of the wiring assembly is used for connecting to the mains, and the output end of the DC transformer is used for connecting to a charging pile.

[0008] Further, it also includes a power generation component;

[0009] The output end of the power generation component is connected to the DC bus.

[0010] Further, the power generation assembly includes a photovoltaic controller and a photovoltaic element;

[0011] The photovoltaic element is electrically connected to the DC bus through the photovoltaic controller.

[0012] Further, the wiring assembly includes an AC input main switch;

[0013] One end of the AC input main switch is electrically connected to the AC input end of the first energy storage converter and the AC input end of the second energy storage converter, and the other end of the AC input main switch is used for external connection to the mains.

[0014] Furthermore, it also includes a first isolating switch and a second isolating switch;

[0015] The DC bus is electrically connected to the first input end of the DC transformer through the first isolating switch, and the DC output end of the second energy storage converter is electrically connected to the second input end of the DC transformer through the second isolating switch.

[0016] Furthermore, it also includes an auxiliary power supply branch, which is electrically connected to the output end of the wiring assembly.

[0017] The beneficial effect of the utility model is that it provides a dual-input charging device, which is equipped with a second energy storage converter, a first energy storage converter and a DC busbar to form a dual-input charging load on the DC transformer. In this way, when the first energy storage converter fails, the second energy storage converter can continue to output power, so that the required power will not be fully added to the energy storage battery, reducing the risk of battery overcurrent; when the second energy storage converter fails, the battery discharge is not affected, so the stable operation of the system can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a connection diagram of a dual-input charging device of the utility model;

[0019] Figure 2 This is a connection diagram of two DC output channels of a dual-input charging device of the utility model.

[0020] Description of labels:

[0021] B1, energy storage battery; BY, DC transformer;

[0022] QF1, main AC input switch; QS1, first isolating switch; QS2, second isolating switch;

[0023] PCS1, the first energy storage converter; PCS2, the second energy storage converter;

[0024] U1, photovoltaic controller; U2, photovoltaic element;

[0025] Vac, mains electricity;

[0026] L1, DC bus; L2, auxiliary power supply branch;

[0027] Z. Charging pile. DETAILED DESCRIPTION

[0028] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0029] Please refer to Figure 1 and Figure 2 , a dual-input charging device, comprising a wiring assembly, a first energy storage converter PCS1, a second energy storage converter PCS2, a DC bus L1, a DC transformer BY and an energy storage battery B1;

[0030] The output end of the wiring assembly is electrically connected to the AC input end of the first energy storage converter PCS1 and the AC input end of the second energy storage converter PCS2 at the same time, the DC output end of the first energy storage converter PCS1, the energy storage battery B1 and the first input end of the DC transformer BY are all electrically connected to the DC bus L1, and the DC output end of the second energy storage converter PCS2 is electrically connected to the second input end of the DC transformer BY;

[0031] The input end of the wiring assembly is used for connecting to the external mains Vac, and the output end of the DC transformer BY is used for connecting to the charging pile Z.

[0032] From the above description, it can be seen that the beneficial effects of the utility model are: a line is set up by cooperating with the second energy storage inverter PCS2, the first energy storage inverter PCS1 and the DC bus L1 to form a dual-input charging on the DC transformer BY to supply the load on the charging pile Z. When the first energy storage inverter PCS1 fails, the second energy storage inverter PCS2 can continue to output power, so that the required power will not be fully added to the energy storage battery B1, reducing the risk of battery overcurrent; when the second energy storage inverter fails, the battery discharge is not affected, ensuring the stable operation of the system.

[0033] Further, it also includes a power generation component;

[0034] The output end of the power generation component is connected to the DC bus L1.

[0035] From the above description, it can be seen that the configuration of the power generation component can independently generate electrical energy and store it in the energy storage battery B1 or transmit it to the charging pile Z for use, thereby alleviating the power supply pressure of the mains Vac and reducing energy loss.

[0036] Further, the power generation component includes a photovoltaic controller U1 and a photovoltaic element U2;

[0037] The photovoltaic element U2 is electrically connected to the DC bus L1 through the photovoltaic controller U1.

[0038] From the above description, it can be seen that by setting the photovoltaic element U2, photovoltaic power generation can be carried out according to the actual environmental conditions, which is energy-saving and environmentally friendly. Through the control of the photovoltaic controller U1, efficient use of light energy can be achieved.

[0039] Further, the wiring assembly includes an AC input main switch QF1;

[0040] One end of the AC input main switch QF1 is electrically connected to both the AC input end of the first energy storage converter PCS1 and the AC input end of the second energy storage converter PCS2, and the other end of the AC input main switch QF1 is used for external connection to the mains Vac.

[0041] From the above description, it can be seen that the AC input main switch QF1 is set to control whether the entire device is connected to the mains Vac and to disconnect it in time when a component of the device is abnormal, so as to protect the power grid and other components.

[0042] Furthermore, it also includes a first isolating switch QS1 and a second isolating switch QS2;

[0043] The DC bus L1 is electrically connected to the first input end of the DC transformer BY through the first isolating switch QS1, and the DC output end of the second energy storage converter PCS2 is electrically connected to the second input end of the DC transformer BY through the second isolating switch QS2.

[0044] From the above description, it can be seen that an isolating switch is provided to form isolation protection between components by controlling the on and off states.

[0045] Furthermore, it also includes an auxiliary power supply branch L2, and the auxiliary power supply branch L2 is electrically connected to the output end of the wiring assembly.

[0046] From the above description, it can be seen that the auxiliary power supply branch L2 is provided to supply power to other components in the energy storage system where the device is located.

[0047] Please refer to Figure 1 and Figure 2 , Embodiment 1 of the present utility model is:

[0048] A dual-input charging device includes a wiring assembly, a first energy storage converter PCS1, a second energy storage converter PCS2, a DC bus L1, a DC transformer BY, and an energy storage battery B1; the wiring assembly includes an AC input master switch QF1; one end of the AC input master switch QF1 is electrically connected to both the AC input end of the first energy storage converter PCS1 and the AC input end of the second energy storage converter PCS2, the other end of the AC input master switch QF1 is used for external connection to the mains Vac, the DC output end of the first energy storage converter PCS1, the energy storage battery B1, and the first input end of the DC transformer BY are all electrically connected to the DC bus L1, the DC output end of the second energy storage converter PCS2 is electrically connected to the second input end of the DC transformer BY; the input end of the wiring assembly is used for external connection to the mains Vac, and the output end of the DC transformer BY is used for connecting to a charging pile Z. The device also includes a power generation assembly; the power generation assembly includes a photovoltaic controller U1 and a photovoltaic element U2; the photovoltaic element U2 is electrically connected to the DC bus L1 through the photovoltaic controller U1.

[0049] In this embodiment, the operating principle of a dual-input charging device is:

[0050] The equipment mainly provides two power supply channels. Channel one is: AC power Vac-wiring assembly-first energy storage inverter PCS1 (energy storage battery B1)-DC bus L1-DC transformer BY-charging pile Z, specifically Z1 or Z2. Channel two is: AC power Vac-wiring assembly-second energy storage inverter PCS2-DC transformer BY-charging pile Z. When the first energy storage inverter PCS1 fails, due to the existence of the second energy storage inverter PCS2, the required power of the load will not be fully added to the energy storage battery B1, thereby greatly reducing the risk of battery overcurrent and ensuring stable operation of the system.

[0051] As a preferred embodiment, the equipment operation process includes:

[0052] First, the equipment is connected to the grid through the input end of the AC input main switch QF1, with a rated voltage of 400Vac; the AC power input of the entire system is controlled; the output end of the AC input main switch QF1 is divided into two paths, connected to the input side of the first energy storage converter PCS1 and the second energy storage converter PCS2 respectively. The rated power of the first energy storage converter PCS1 is P1, and the rated power of the second energy storage converter PCS2 is P2; a photovoltaic controller U1 is configured with a rated power of A; a storage battery B1 is configured with a rated capacity of B kWh; a dual-channel input DC transformer BY is configured, whose input voltage supports 600V-900VDC and the rated power is D.

[0053] Then, channel 1 is matched with energy storage battery B1 and the first energy storage converter PCS1, which can provide rated power D1; channel 2 is connected to the second energy storage converter PCS2, using DC constant voltage mode input, setting the constant voltage mode to 750V, which can provide rated power D2, then D = D1 + D2. The first isolation switch QS1 and the second isolation switch QS2 are set at the channel input respectively;

[0054] The DC bus L1 is electrically connected to the first input end of the DC transformer BY through the first isolating switch QS1, and the DC output end of the second energy storage converter PCS2 is electrically connected to the second input end of the DC transformer BY through the second isolating switch QS2, which can cut off the DC input; the maximum power of channel 1 D1 = A+B+P1.

[0055] The rated power of the high-power PCS configured in the original system is P, P=P1+P2, P>2B, and the maximum discharge power of the system is A+B+P. When the PCS suddenly fails and the EMS regulation response is not timely, the power provided by the original PCS is instantly added to the battery, and the maximum discharge rate of the battery is equal to (B+P) / B. After changing to two-way PCS input, when the first energy storage inverter PCS1 and the second energy storage inverter PCS2 are running at the same time, if the first energy storage inverter PCS1 fails, the battery discharge rate is equal to (B+P1) / B, and the overcurrent rate is less than the overcurrent rate of the original one PCS; if the second energy storage inverter PCS2 fails, the battery discharge is not affected.

[0056] In this embodiment, an auxiliary power supply branch L2 is also included, and the auxiliary power supply branch L2 is electrically connected to the output end of the wiring assembly.

[0057] In summary, the utility model provides a dual-input charging device, which is composed of a second energy storage inverter, a first energy storage inverter and a DC bus, to form a dual-input charging load on the DC transformer for charging the load on the charging pile. When the first energy storage inverter fails, the second energy storage inverter can continue to output power, so that the required power will not be fully added to the energy storage battery, reducing the risk of battery overcurrent and ensuring stable operation of the system.

[0058] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A dual-input charging device, characterized in that: It includes a wiring assembly, a first energy storage converter, a second energy storage converter, a DC bus, a DC transformer and an energy storage battery; The output end of the wiring assembly is electrically connected to the AC input end of the first energy storage converter and the AC input end of the second energy storage converter at the same time, the DC output end of the first energy storage converter, the energy storage battery and the first input end of the DC transformer are all electrically connected to the DC bus, and the DC output end of the second energy storage converter is electrically connected to the second input end of the DC transformer; The input end of the wiring assembly is used for connecting to the mains, and the output end of the DC transformer is used for connecting to a charging pile.

2. A dual-input charging device according to claim 1, characterized in that: Also included are power generation components; The output end of the power generation component is connected to the DC bus.

3. A dual-input charging device according to claim 2, characterized in that: The power generation assembly includes a photovoltaic controller and a photovoltaic element; The photovoltaic element is electrically connected to the DC bus through the photovoltaic controller.

4. A dual-input charging device according to claim 1, characterized in that: The wiring assembly includes an AC input main switch; One end of the AC input main switch is electrically connected to the AC input end of the first energy storage converter and the AC input end of the second energy storage converter, and the other end of the AC input main switch is used for external connection to the mains.

5. A dual-input charging device according to claim 1, characterized in that: Also includes a first isolating switch and a second isolating switch; The DC bus is electrically connected to the first input end of the DC transformer through the first isolating switch, and the DC output end of the second energy storage converter is electrically connected to the second input end of the DC transformer through the second isolating switch.

6. A dual-input charging device according to claim 1, characterized in that: It also includes an auxiliary power supply branch, which is electrically connected to the output end of the wiring assembly.

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