Novel energy storage system with impact load resistance function

Abstract

The utility model discloses a novel energy storage system with an impact load resistance function, which comprises an energy management system (EMS) energy management module, a power control system (PCS) energy storage converter, a battery management system (BMS) battery management module, a first charge and discharge control circuit, a second charge and discharge control circuit, an energy storage battery pack and a super capacitor bank, the PCS energy storage converter is used for controlling the energy flow direction, the BMS battery management module is used for controlling the working state of the first charging and discharging control circuit, the first charging and discharging control circuit is used for controlling the charging and discharging state of the energy storage battery pack, the second charging and discharging control circuit is used for controlling the charging and discharging state of the super capacitor bank, and the impact load resisting effect is achieved. The anti-impact load effect can be effectively achieved in the discharging process of the energy storage battery pack, so that the cost is reduced, and the service life of the energy storage battery pack can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems, and in particular to a novel energy storage system with a function of resisting impact loads. Background Art

[0002] There are various commercial peak-shifting and valley-filling energy storage systems on the market. However, when faced with impact loads (such as air conditioning startup), existing energy storage systems can only rely on increasing the capacity of the energy storage battery. This not only increases the cost of the energy storage system, but the excessive impact current also reduces the service life of the energy storage battery. Utility Model Content

[0003] In view of this, the utility model proposes a new energy storage system with impact load resistance function, which can solve the defects of high cost and short service life of energy storage batteries in the prior art.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A novel energy storage system with anti-impact load function, comprising an EMS energy management module, a PCS energy storage converter, a BMS battery management module, a first charge and discharge control circuit, a second charge and discharge control circuit, an energy storage battery pack and a supercapacitor pack, wherein the EMS energy management module is used to manage the energy flow direction, the PCS energy storage converter is used to control the energy flow direction, the BMS battery management module is used to control the working state of the first charge and discharge control circuit, the first charge and discharge control circuit is used to control the charge and discharge state of the energy storage battery pack, the second charge and discharge control circuit is used to control the charge and discharge state of the supercapacitor pack, and To achieve the effect of resisting impact load, the input end of the PCS energy storage inverter is connected to the AC power grid, the output end of the PCS energy storage inverter is respectively connected to the input end of the first charge and discharge control circuit and the input end of the second charge and discharge control circuit, the output end of the first charge and discharge control circuit is connected to the energy storage battery group, the output end of the second charge and discharge control circuit is connected to the supercapacitor group, the EMS energy management module is respectively connected to the PCS energy storage inverter, the first charge and discharge control circuit, the second charge and discharge control circuit, the energy storage battery group and the supercapacitor group, and the BMS battery management module is connected to the first charge and discharge control circuit and the energy storage battery group.

[0006] As a further optional scheme for the new energy storage system with anti-impact load function, the first charge and discharge control circuit includes a step-down charging circuit and a first boost discharge circuit, the step-down charging circuit is electrically connected to the EMS energy management module, the PCS energy storage inverter, the BMS battery management module, the energy storage battery pack and the first boost discharge circuit respectively, and the first boost discharge circuit is also electrically connected to the PCS energy storage inverter and the energy storage battery pack.

[0007] As a further optional solution for the new energy storage system with anti-impact load function, the step-down charging circuit includes a first transistor, the base electrode of the first transistor is electrically connected to the EMS energy management module and the BMS battery management module respectively, the collector of the first transistor is electrically connected to the PCS energy storage inverter, and the emitter of the first transistor is electrically connected to the energy storage battery pack and the first boost discharge circuit respectively.

[0008] As a further optional scheme for the new energy storage system with impact load resistance function, the first boost discharge circuit includes a first inductor, a first diode and a second transistor, one end of the first inductor is electrically connected to the emitter of the first transistor and the energy storage battery pack, respectively, the other end of the first inductor is electrically connected to one end of the first diode and the collector of the second transistor, respectively, the other end of the first diode is electrically connected to the PCS energy storage inverter, the base electrode of the second transistor is electrically connected to the energy storage battery pack, and the emitter of the second transistor is grounded.

[0009] As a further optional solution for the new energy storage system with anti-impact load function, the second charge and discharge control circuit includes a second charging circuit and a second boost discharge circuit, and the second charging circuit is electrically connected to the EMS energy management module, the PCS energy storage inverter, the supercapacitor group and the second boost discharge circuit respectively, and the second boost discharge circuit is also electrically connected to the PCS energy storage inverter and the supercapacitor group.

[0010] As a further optional scheme for the new energy storage system with anti-impact load function, the second charging circuit includes a field effect tube, a first resistor and a switch, one end of the field effect tube is electrically connected to the EMS energy management module, the supercapacitor group, the second boost discharge circuit and one end of the switch respectively, the other end of the field effect tube is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to the PCS energy storage inverter, and the other end of the switch is electrically connected to the PCS energy storage inverter.

[0011] As a further optional scheme for the new energy storage system with impact load resistance function, the second boost discharge circuit includes a second inductor, a second diode and a fourth transistor, one end of the second inductor is electrically connected to the field effect tube and the supercapacitor group respectively, the other end of the second inductor is electrically connected to one end of the second diode and the collector of the fourth transistor respectively, the other end of the second diode is electrically connected to the PCS energy storage inverter, the base electrode of the fourth transistor is electrically connected to the EMS energy management module, and the emitter of the fourth transistor is grounded.

[0012] The beneficial effect of the utility model is that by providing a second charge and discharge control circuit and a supercapacitor group, and controlling the charge and discharge state of the supercapacitor group by the second charge and discharge control circuit, the effect of resisting impact load can be effectively achieved during the discharge process of the energy storage battery group, thereby reducing costs and increasing the service life of the energy storage battery group. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a schematic diagram of the composition of a new energy storage system with impact load resistance function of the utility model;

[0015] Figure 2 The utility model is a circuit diagram of a novel energy storage system with impact load resistance function. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] refer to Figure 1-2, a new energy storage system with anti-impact load function, including an EMS energy management module, a PCS energy storage converter, a BMS battery management module, a first charge and discharge control circuit, a second charge and discharge control circuit, an energy storage battery group and a super capacitor group, the EMS energy management module is used to manage the energy flow direction, the PCS energy storage converter is used to control the energy flow direction, the BMS battery management module is used to control the working state of the first charge and discharge control circuit, the first charge and discharge control circuit is used to control the charge and discharge state of the energy storage battery group, the second charge and discharge control circuit is used to control the charge and discharge state of the super capacitor group, and To achieve the effect of resisting impact load, the input end of the PCS energy storage inverter is connected to the AC power grid, the output end of the PCS energy storage inverter is respectively connected to the input end of the first charge and discharge control circuit and the input end of the second charge and discharge control circuit, the output end of the first charge and discharge control circuit is connected to the energy storage battery group, the output end of the second charge and discharge control circuit is connected to the supercapacitor group, the EMS energy management module is respectively connected to the PCS energy storage inverter, the first charge and discharge control circuit, the second charge and discharge control circuit, the energy storage battery group and the supercapacitor group, and the BMS battery management module is connected to the first charge and discharge control circuit and the energy storage battery group.

[0018] In this embodiment, by providing a second charge and discharge control circuit and a supercapacitor group, and controlling the charge and discharge state of the supercapacitor group by the second charge and discharge control circuit, the effect of resisting impact load can be effectively achieved during the discharge process of the energy storage battery group, thereby reducing costs and increasing the service life of the energy storage battery group.

[0019] It should be noted that in the attached Figure 1 In the figure, EMS is the EMS energy management module, which manages the direction of energy flow; PCS is the PCS energy storage inverter, which controls the direction of energy flow. One end of the PCS energy storage inverter is connected to the DC bus and the other end is connected to the AC power grid. The EMS energy management module controls the PCS energy storage inverter to achieve energy direction control. When the PCS energy storage inverter works in the rectification state, the PCS absorbs electric energy from the power grid and charges the energy storage battery pack through the first charge and discharge control circuit. When the PCS energy storage inverter works in the inverter state, the PCS energy storage inverter sends the electric energy stored in the energy storage battery pack back to the AC power grid. BMS is the BMS battery management module, which manages the charge and discharge voltage and current of the battery pack and the temperature of the battery in real time. The BMS battery management module controls the working state of the first charge and discharge control circuit to prevent the battery pack from overcharging and over-discharging, thereby ensuring the reliability and safety of the battery pack. DC / DC1 is the first charge and discharge control circuit, and DC / DC2 is the second charge and discharge control circuit.

[0020] Preferably, the first charge and discharge control circuit includes a step-down charging circuit and a first boost discharge circuit, the step-down charging circuit is electrically connected to the EMS energy management module, the PCS energy storage inverter, the BMS battery management module, the energy storage battery pack and the first boost discharge circuit respectively, and the first boost discharge circuit is also electrically connected to the PCS energy storage inverter and the energy storage battery pack.

[0021] Preferably, the step-down charging circuit includes a first transistor, a base electrode of the first transistor is electrically connected to the EMS energy management module and the BMS battery management module respectively, a collector of the first transistor is electrically connected to the PCS energy storage inverter, and an emitter of the first transistor is electrically connected to the energy storage battery pack and the first boost discharge circuit respectively.

[0022] Preferably, the first boost discharge circuit includes a first inductor, a first diode and a second transistor, one end of the first inductor is electrically connected to the emitter of the first transistor and the energy storage battery pack, respectively, the other end of the first inductor is electrically connected to one end of the first diode and the collector of the second transistor, respectively, the other end of the first diode is electrically connected to the PCS energy storage inverter, the base electrode of the second transistor is electrically connected to the energy storage battery pack, and the emitter of the second transistor is grounded.

[0023] In this embodiment, DC / DC1 is composed of a first transistor Q1, a second transistor Q2, a first inductor L1, and a first diode D1, BT is an energy storage battery group, and C is a supercapacitor group; the first transistor Q1 in DC / DC1 is a step-down charging circuit, and the second transistor Q2, the first inductor L1, and the first diode D1 are a first boost discharge circuit. When charging, the PCS energy storage converter works in a rectifying state, and the DC bus operating voltage is 800V. By controlling the first transistor Q1, the charging voltage and charging current of the energy storage battery group BT can be controlled. When discharging, the PCS energy storage converter works in an inverter state, and the first boost circuit increases the voltage of the energy storage battery group BT to 800V and then sends it to the DC bus through the first diode D1. The PCS energy storage converter sends the electric energy stored in the energy storage battery group BT back to the power grid through the DC bus.

[0024] Preferably, the second charge and discharge control circuit includes a second charging circuit and a second boost discharge circuit, the second charging circuit is electrically connected to the EMS energy management module, the PCS energy storage inverter, the supercapacitor group and the second boost discharge circuit respectively, and the second boost discharge circuit is also electrically connected to the PCS energy storage inverter and the supercapacitor group.

[0025] Preferably, the second charging circuit includes a field effect tube, a first resistor and a switch, one end of the field effect tube is electrically connected to the EMS energy management module, the supercapacitor group, the second boost discharge circuit and one end of the switch respectively, the other end of the field effect tube is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to the PCS energy storage inverter, and the other end of the switch is electrically connected to the PCS energy storage inverter.

[0026] Preferably, the second boost discharge circuit includes a second inductor, a second diode and a fourth transistor, one end of the second inductor is electrically connected to the field effect transistor and the supercapacitor group, respectively, the other end of the second inductor is electrically connected to one end of the second diode and the collector of the fourth transistor, respectively, the other end of the second diode is electrically connected to the PCS energy storage inverter, the base electrode of the fourth transistor is electrically connected to the EMS energy management module, and the emitter of the fourth transistor is grounded.

[0027] In this embodiment, DC / DC2 is composed of a field effect tube Q3, a switch S, a first resistor R (current limiting resistor), a second inductor L2, a second diode D2, and a fourth transistor Q4. The field effect tube Q3, the switch S, and the first resistor R in DC / DC2 are a second charging circuit, and the second inductor L2, the second diode D2, and the fourth transistor Q4 are a second boost discharge circuit. When charging, the PCS energy storage converter works in a rectifying state, and the DC bus working voltage is 800V. First, the field effect tube Q3 is turned on, and the current is limited by the first resistor R to charge the super capacitor group C. When the charging voltage of the supercapacitor group C reaches about 1 / 3 of the bus voltage, the switch S is closed, the field effect tube Q3 is bypassed and disconnected, and the current continues to charge the supercapacitor group C through S until the voltage of the supercapacitor group C reaches 800V, and the switch S is disconnected to prepare for the discharge of the supercapacitor group C; during discharge, the PCS energy storage converter works in the inverter state. When an impact load occurs, the second boost circuit increases the voltage of the supercapacitor group C to 800V and then sends it to the DC bus through the second diode D2. The PCS energy storage converter sends the electric energy stored in the energy storage battery group BT back to the grid through the DC bus.

[0028] The specific working principle is as follows:

[0029] Charge:

[0030] (1) Charging the energy storage battery pack: The EMS energy management module enables the PCS energy storage inverter to operate in a rectification state, with a rectifier output voltage of about 800V. The EMS energy management module and the BMS battery management module control the first transistor Q1 to charge the energy storage battery pack BT. When the BMS battery management module detects that the battery pack is fully charged, the first transistor Q1 is turned off, and the charging process of the energy storage battery pack BT is completed.

[0031] (2) Charging of the supercapacitor group: When the PCS energy storage converter is operating in the rectification state, in order to prevent the supercapacitor group C from generating impact current when charging, the switch S is in the open state. When charging, the field effect transistor Q3 is first triggered, and the charging current charges the supercapacitor group C through the first resistor R. When the capacitor voltage reaches the rated voltage set by the EMS energy management module, the switch S is closed to short-circuit the first resistor R and the field effect transistor Q3, and the current continues to charge the supercapacitor group C through S until it is fully charged, and the switch S is disconnected.

[0032] Discharge:

[0033] (1) Normal discharge: The EMS energy management module enables the PCS energy storage converter to operate in the inverter state. The first boost discharge circuit increases the voltage of the BT to about 800 V and sends it to the DC bus. The PCS energy storage converter sends the electric energy stored in the energy storage battery pack BT back to the grid.

[0034] (2) Discharge of impact load: The EMS energy management module enables the PCS energy storage converter to operate in the inverter state. When an impact load occurs, the EMS energy management module controls the boost circuit to increase the voltage of the supercapacitor group C to 800V and send it to the DC bus. Since the purpose of the supercapacitor group C discharge is to resist impact loads, the sum of its discharge current and the energy storage battery group discharge current is equal to the impact load current, thereby avoiding the impact of the impact load on the energy storage battery group BT.

[0035] (3) Secondary charging of supercapacitor group C: When the supercapacitor group C is discharged, its corresponding second boost discharge circuit stops working, and the energy storage battery group continues to discharge through the PCS energy storage inverter. Supercapacitor group C enters the secondary charging state. At this time, switch S and field effect transistor Q3 are in the disconnected state. When charging, field effect transistor Q3 is first triggered, and the charging current charges the supercapacitor group C through the first resistor R. When the capacitor voltage reaches the rated voltage set by the EMS energy management module, switch S closes to short-circuit the first resistor R and field effect transistor Q3, and the current continues to charge the supercapacitor group C through switch S until it is fully charged, and switch S is disconnected to prepare for the next impact load.

[0036] (4) During the discharge of the energy storage battery pack BT, secondary charging may be continued for multiple times until the discharge of the energy storage battery pack BT is completed.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new energy storage system with anti-shock load function, It is characterized in that It includes an EMS energy management module, a PCS energy storage converter, a BMS battery management module, a first charge and discharge control circuit, a second charge and discharge control circuit, an energy storage battery pack and a super capacitor pack. The EMS energy management module is used to manage the energy flow direction, the PCS energy storage converter is used to control the energy flow direction, the BMS battery management module is used to control the working state of the first charge and discharge control circuit, the first charge and discharge control circuit is used to control the charge and discharge state of the energy storage battery pack, and the second charge and discharge control circuit is used to control the charge and discharge state of the super capacitor pack, and achieve the effect of resisting impact load The input end of the PCS energy storage converter is connected to the AC power grid, the output end of the PCS energy storage converter is respectively connected to the input end of the first charge and discharge control circuit and the input end of the second charge and discharge control circuit, the output end of the first charge and discharge control circuit is connected to the energy storage battery pack, the output end of the second charge and discharge control circuit is connected to the supercapacitor group, the EMS energy management module is respectively connected to the PCS energy storage converter, the first charge and discharge control circuit, the second charge and discharge control circuit, the energy storage battery pack and the supercapacitor group, and the BMS battery management module is connected to the first charge and discharge control circuit and the energy storage battery pack.

2. A novel energy storage system with anti-shock load function according to claim 1, It is characterized in that The first charge and discharge control circuit includes a step-down charging circuit and a first boost discharging circuit. The step-down charging circuit is electrically connected to the EMS energy management module, the PCS energy storage inverter, the BMS battery management module, the energy storage battery pack and the first boost discharging circuit respectively. The first boost discharging circuit is also electrically connected to the PCS energy storage inverter and the energy storage battery pack.

3. A novel energy storage system with anti-shock load function according to claim 2, It is characterized in that The step-down charging circuit includes a first transistor, the base electrode of the first transistor is electrically connected to the EMS energy management module and the BMS battery management module respectively, the collector of the first transistor is electrically connected to the PCS energy storage inverter, and the emitter of the first transistor is electrically connected to the energy storage battery pack and the first boost discharge circuit respectively.

4. A novel energy storage system with anti-impact load function according to claim 3, It is characterized in that The first boost discharge circuit includes a first inductor, a first diode and a second transistor, one end of the first inductor is electrically connected to the emitter of the first transistor and the energy storage battery pack, respectively, the other end of the first inductor is electrically connected to one end of the first diode and the collector of the second transistor, respectively, the other end of the first diode is electrically connected to the PCS energy storage inverter, the base electrode of the second transistor is electrically connected to the energy storage battery pack, and the emitter of the second transistor is grounded.

5. A novel energy storage system with anti-impact load function according to claim 4, It is characterized in that The second charge and discharge control circuit includes a second charging circuit and a second boost discharge circuit. The second charging circuit is electrically connected to the EMS energy management module, the PCS energy storage inverter, the supercapacitor group and the second boost discharge circuit respectively. The second boost discharge circuit is also electrically connected to the PCS energy storage inverter and the supercapacitor group.

6. A novel energy storage system with anti-impact load function according to claim 5, It is characterized in that The second charging circuit includes a field effect tube, a first resistor and a switch, one end of the field effect tube is electrically connected to the EMS energy management module, the supercapacitor group, the second boost discharge circuit and one end of the switch respectively, the other end of the field effect tube is electrically connected to one end of the first resistor, the other end of the first resistor is electrically connected to the PCS energy storage inverter, and the other end of the switch is electrically connected to the PCS energy storage inverter.

7. A novel energy storage system with anti-impact load function according to claim 6, It is characterized in that The second boost discharge circuit includes a second inductor, a second diode and a fourth transistor, one end of the second inductor is electrically connected to the field effect transistor and the supercapacitor group respectively, the other end of the second inductor is electrically connected to one end of the second diode and the collector of the fourth transistor respectively, the other end of the second diode is electrically connected to the PCS energy storage inverter, the base electrode of the fourth transistor is electrically connected to the EMS energy management module, and the emitter of the fourth transistor is grounded.

Images