Micro-grid energy storage power control system

Abstract

The utility model relates to the technical field of energy storage power generation, in particular to a microgrid energy storage power control system, which comprises an energy storage battery pack, an energy storage bidirectional converter, a Boost circuit, a change-over switch, a battery management terminal and a power distribution monitoring terminal. The power distribution monitoring terminal is in communication connection with the battery management terminal; the battery management terminal is connected with the energy storage battery pack, a direct current output end of the energy storage battery pack is connected with the change-over switch, the change-over switch is respectively connected with the energy storage bidirectional converter and the Boost circuit, and an output end of the Boost circuit is connected with an input end of the energy storage bidirectional converter; and the change-over switch is electrically connected with the battery management terminal. The intelligent parallel connection and electric energy boost conversion of the energy storage battery pack according to the load demand are realized by collecting the power supply electric energy output by the transformer in the monitoring station area and the load demand data of the load electricity consumption end in real time.

Description

Technical Field

[0001] This utility model relates to the field of energy storage and power generation technology, specifically a microgrid energy storage power control system. Background Technology

[0002] In both grid-connected and islanded scenarios, microgrid systems utilize intelligent distribution cabinets to switch various components on and off, controlling power generation, energy storage, and load to maintain stable operation. Energy storage devices play a crucial role in this process. When grid supply is sufficient, energy storage devices store excess energy; when grid supply is insufficient, they release the stored energy to meet load demands.

[0003] However, energy storage devices are limited by the number of integrated energy storage battery packs and the energy stored in each energy storage battery pack. Their rated power and energy capacity are limited by hardware. When the load demand exceeds the existing energy capacity of the energy storage device, it cannot effectively support long-term power supply and thus smooth out power fluctuations. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a microgrid energy storage power control system, comprising an energy storage battery pack, an energy storage bidirectional converter, a boost circuit, a transfer switch, a battery management terminal, and a power distribution monitoring terminal; the power distribution monitoring terminal is communicatively connected to the battery management terminal; the battery management terminal is connected to the energy storage battery pack, the DC output terminal of the energy storage battery pack is connected to the transfer switch, the transfer switch is connected to both the energy storage bidirectional converter and the boost circuit, the output terminal of the boost circuit is connected to the input terminal of the energy storage bidirectional converter; the transfer switch is electrically connected to the battery management terminal.

[0005] In a specific implementation, the energy storage battery pack is composed of several lithium battery packs connected in parallel at multiple stages.

[0006] The Boost converter circuit includes a MOSFET switch, capacitors C1 and C2, diode D1, and inductor L1. Capacitor C1 is connected to a selector switch. One end of inductor L1 is electrically connected to the selector switch and one end of capacitor C1, and the other end is electrically connected to one end of capacitor C2 through diode D1. The series connection node of inductor L1 and diode D1 is connected to the source of the MOSFET switch. The drain of the MOSFET switch is grounded, and capacitor C2 is connected to a bidirectional energy storage converter.

[0007] In order to achieve grid connection of energy storage power generation, the microgrid energy storage power control system is connected to the transmission line, which is connected to the distribution transformer and the load power terminal.

[0008] The power distribution monitoring terminal is electrically connected to the transmission line and can monitor the power supply of the transmission line.

[0009] The power distribution monitoring terminal is installed on the load power consumption side and is used to collect and monitor the load demand data of the load power consumption side.

[0010] The microgrid energy storage power control system also includes a circuit breaker switch, which is electrically connected between the energy storage bidirectional converter and the transmission line.

[0011] The circuit breaker switch is connected to the power distribution monitoring terminal, which can control the circuit breaker switch to disconnect the circuit and realize the off-grid power disconnection of the energy storage battery pack.

[0012] Beneficial Effects: This utility model is a microgrid energy storage power control system. It collects real-time data on the power output from the transformer in the monitoring area and the load demand at the load end through a power distribution monitoring terminal. Based on the load demand and the power supply, it controls the grid-connected power generation of the energy storage battery pack. Through the coordinated operation of the energy storage battery pack, bidirectional energy storage converter, boost circuit, and transfer switch, it achieves intelligent parallel connection and power boost conversion of the energy storage battery pack according to load demand. This allows for stable grid-connected power generation without being limited by the current stored energy capacity. It solves the problem that traditional energy storage devices cannot effectively support long-term power supply when the load demand exceeds their existing energy storage capacity, thus improving the power supply stability and reliability of the microgrid system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the microgrid energy storage power control system.

[0014] Figure 2 This is a diagram of a Boost converter circuit. Detailed Implementation

[0015] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0016] Example

[0017] See Figure 1 This embodiment provides a microgrid energy storage power control system, which is connected to a transmission line, and the transmission line connects to a distribution transformer and a load terminal. This microgrid energy storage power control system can control the power output of the energy storage battery pack according to the load demand of the load terminal and the power supply from the distribution transformer.

[0018] The microgrid energy storage power control system specifically includes an energy storage battery pack, an energy storage bidirectional converter, a boost converter circuit, a transfer switch, a battery management terminal, and a power distribution monitoring terminal. The power distribution monitoring terminal is electrically connected to the transmission line and is located on the load side. It can collect real-time data on the supply voltage and current output from the transformer in the monitoring area, as well as the load demand data at the load end. The power distribution monitoring terminal is communicatively connected to the battery management terminal. When the power distribution monitoring terminal detects that the load demand data exceeds the supply power, requiring the energy storage battery pack to generate electricity via grid connection, it transmits a grid connection signal to the battery management terminal. The battery management terminal is connected to the energy storage battery pack. It can collect real-time data on the battery charge of the energy storage battery pack and, based on the grid connection signal from the power distribution monitoring terminal, drive the energy storage battery pack to transmit stored energy.

[0019] Meanwhile, in order to ensure the stability of the transmission of stored electrical energy, the energy storage battery pack is composed of several lithium battery packs connected in parallel at multiple levels. The energy storage battery pack can be intelligently connected in parallel according to the load demand of the load end, so as to combine and transmit the electrical energy stored in each lithium battery pack.

[0020] To ensure stable grid-connected power generation without being limited by the current stored energy capacity, the DC output terminal of the energy storage battery pack is connected to a transfer switch. This transfer switch is connected to both a bidirectional energy storage converter and a boost circuit. The output terminal of the boost circuit is connected to the input terminal of the bidirectional energy storage converter. The transfer switch is electrically connected to a battery management terminal, which can control the transfer switch to switch the circuit based on collected battery circuit data. Its working principle is as follows: When the load demand data of the load end is small compared with the grid-connected power required by the power supply, the transfer switch directly connects the energy storage battery pack and the energy storage bidirectional converter. The energy storage bidirectional converter directly converts the stored energy of the energy storage battery pack into AC power and transmits it to the transmission line for grid-connected power generation to meet the load demand of the load end. On the other hand, when the required grid-connected power is large and the parallel voltage of the energy storage battery pack is low, the transfer switch connects the energy storage battery pack to the Boost boost circuit. The Boost boost circuit boosts the DC power and then transmits the power to the energy storage bidirectional converter. The boosted voltage is then used for grid-connected power generation to meet the power demand of the load end.

[0021] like Figure 2As shown, the Boost circuit includes a MOSFET switch, capacitors C1 and C2, diode D1, and inductor L1. Capacitor C1 is connected to a changeover switch and filters the input current. One end of inductor L1 is electrically connected to the changeover switch and one end of capacitor C1, while the other end is electrically connected to one end of capacitor C2 via diode D1. The series connection between inductor L1 and diode D1 is connected to the source of the MOSFET switch, and diode D1 provides circuit protection. The drain of the MOSFET switch is grounded. Capacitor C2 is connected to a bidirectional energy storage converter, transmitting the boosted current and voltage to the bidirectional energy storage converter. The gate of the MOSFET switch can receive control signals. By adjusting the operating voltage between the gate and the capacitor between the gate and the source, the gate and source are switched on or off, thereby adjusting the output voltage.

[0022] The bidirectional energy storage converter can convert the DC power from the energy storage battery pack into AC power, enabling grid-connected power generation. It can also convert AC power from the transmission line into DC power to charge the energy storage battery pack and replenish its stored energy. Furthermore, to prevent reverse power transmission from the transmission line during grid-connected power generation, the system includes a circuit breaker switch. This circuit breaker switch is electrically connected between the bidirectional energy storage converter and the transmission line, and is also connected to a power distribution monitoring terminal. When the power distribution monitoring terminal detects that the power supply from the transmission line can meet the load demand of the load end, it controls the circuit breaker switch to disconnect the energy storage battery pack from the grid.

Claims

1. A microgrid energy storage power control system, characterized in that, This includes energy storage battery packs, energy storage bidirectional converters, boost converter circuits, transfer switches, battery management terminals, and power distribution monitoring terminals; The power distribution monitoring terminal is communicatively connected to the battery management terminal; the battery management terminal is connected to the energy storage battery pack, the DC output terminal of the energy storage battery pack is connected to a transfer switch, the transfer switch is connected to the energy storage bidirectional converter and the Boost boost circuit respectively, the output terminal of the Boost boost circuit is connected to the input terminal of the energy storage bidirectional converter; the transfer switch is electrically connected to the battery management terminal.

2. The microgrid energy storage power control system according to claim 1, characterized in that, The energy storage battery pack is composed of several lithium battery packs connected in parallel at multiple stages.

3. The microgrid energy storage power control system according to claim 1, characterized in that, The Boost converter circuit includes a MOSFET switch, capacitors C1 and C2, diode D1, and inductor L1. Capacitor C1 is connected to a selector switch. One end of inductor L1 is electrically connected to the selector switch and one end of capacitor C1, and the other end is electrically connected to one end of capacitor C2 through diode D1. The series connection node of inductor L1 and diode D1 is connected to the source of the MOSFET switch. The drain of the MOSFET switch is grounded, and capacitor C2 is connected to a bidirectional energy storage converter.

4. The microgrid energy storage power control system according to claim 1, characterized in that, The microgrid energy storage power control system is connected to the transmission line, which is connected to the distribution transformer and the load power terminal.

5. The microgrid energy storage power control system according to claim 4, characterized in that, The power distribution monitoring terminal is electrically connected to the power transmission line.

6. The microgrid energy storage power control system according to claim 5, characterized in that, The power distribution monitoring terminal is installed on the load power consumption side and is used to collect and monitor the load demand data of the load power consumption side.

7. The microgrid energy storage power control system according to claim 1, characterized in that, It also includes a circuit breaker switch, which is electrically connected between the energy storage bidirectional converter and the transmission line.

8. The microgrid energy storage power control system according to claim 7, characterized in that, The circuit breaker switch is connected to the power distribution monitoring terminal.

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