A self-charging control system and method based on microgrid

Abstract

The present invention discloses a microgrid-based self-charging control system, comprising an EMS microgrid battery pack, an EMS microgrid AC switch, an EMS microgrid control system, a diesel generator control system, a diesel generator, a diesel generator switch, an AC / DC module, a microgrid self-charging system, a DC / DC module, a BMS emergency start switch, a PCS energy storage converter, a PCS control system, a BMS DC switch, a BMS battery cluster, a BMS control system, a DC-DC converter, a DC-DC control system, and photovoltaic modules. The present invention has the advantage over existing technologies in that it utilizes the energy from the microgrid's internal energy storage battery cluster or the diesel generator to automatically and continuously charge the microgrid control system when the power supply is shut down, preventing the microgrid system from being unable to start after a prolonged shutdown, thereby improving system stability and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy microgrid control systems, and in particular to a microgrid-based self-charging control system and method. Background Art

[0002] Currently, in the new energy microgrid system, EMS microgrid control system, PCS energy storage converter, DCDC converter, BMS battery management system, BMS battery cluster, wind turbine inverter, wind turbine controller, etc. are all key equipment of the new energy microgrid system. The startup and operation of these devices require the microgrid system to provide control power, so the role of the microgrid control system battery pack is very critical. If the on-site equipment is down for a long time, the microgrid battery pack will be exhausted. Therefore, the self-charging device and method of the microgrid control system can become one of the key technologies to solve the current problem. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a self-charging control system and method based on a microgrid.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a self-charging control system based on a microgrid, including an EMS microgrid battery pack, an EMS microgrid AC switch, an EMS microgrid control system, a diesel generator control system, a diesel generator, a diesel generator switch, an AC / DC module, a microgrid self-charging system, a DC / DC module, a BMS emergency start switch, a PCS energy storage converter, a PCS control system, a BMS DC switch, a BMS battery cluster, a BMS control system, a DCDC converter, a DCDC control system and a photovoltaic module, wherein the EMS microgrid battery pack, the EMS microgrid control system and the BMS control system are connected via an AC bus 1, the EMS microgrid battery pack, the EMS microgrid AC switch, the diesel generator switch and the PCS energy storage converter are connected via an AC bus 2, the EMS microgrid AC switch, the EMS microgrid control system, the PCS control system, the PCS energy storage converter, the DCDC converter, the DC The C control system, BMS control system, BMS battery cluster, microgrid self-charging system, BMS emergency start switch, diesel generator control system, diesel generator switch and diesel generator are connected through a communication bus. The diesel generator switch connects the diesel generator control system and the diesel generator through the AC bus 3. The diesel generator is connected to the AC / DC module through the AC bus 4. The photovoltaic assembly is connected to the DCDC converter through the DC bus 1. The DCDC converter connects the BMS emergency start switch, the BMS DC switch, the DCDC control system and the PCS energy storage converter through the DC bus 2. The BMS DC switch is connected to the BMS battery cluster through the DC bus 3. The BMS emergency start switch connects the BMS battery cluster and the DC / DC module through the DC bus 4. The DC / DC module is connected to the microgrid self-charging system through the DC bus 6. The microgrid self-charging system is connected to the AC / DC module through the DC bus 5.

[0005] As an improvement, a load bus is connected to the EMS microgrid AC switch.

[0006] As an improvement, the BMS emergency start switch and the diesel generator switch are normally open switches, and both the BMS emergency start switch and the diesel generator switch are interlocked with the BMS DC switch.

[0007] A self-charging control method based on a microgrid specifically includes the following steps:

[0008] S1. The DC / DC module is powered by the BMS battery cluster connected to DC bus 4. DC bus 6 sends the DC / DC module power to the microgrid self-charging system. The microgrid self-charging system controls the BMS emergency start switch via the communication bus. The BMS emergency start switch sends the power of the BMS battery cluster to the PCS energy storage converter via DC bus 2. The PCS energy storage converter sends the power to the EMS microgrid battery pack via AC bus 2. The microgrid self-charging system exchanges data with the PCS system and the EMS microgrid control system via the communication bus to automatically control the charging of the EMS microgrid battery pack.

[0009] S2: Send the diesel generator power to the diesel generator switch and diesel generator control system through AC bus 3, send the diesel generator power to the AC / DC module through AC bus 4, send the power of the AC / DC module to the microgrid self-charging system through DC bus 5, control the diesel generator switch through the communication bus and the microgrid self-charging system, send the diesel generator power to the EMS microgrid battery pack through AC bus 2, and the microgrid self-charging system exchanges data with the EMS microgrid control system and diesel generator control system to automatically control the charging of the EMS microgrid battery pack.

[0010] As an improvement, when the EMS microgrid battery pack is charging, the DCDC converter does not work and the DCDC converter only works when the microgrid is operating normally, ultimately supplying power to the load bus while charging the BMS battery cluster.

[0011] As an improvement, when the EMS microgrid battery pack is charging, the BMS emergency start switch is interlocked with the diesel generator switch and the BMS emergency start switch and the diesel generator switch do not work at the same time.

[0012] As an improvement, when the EMS microgrid battery pack is charging, the microgrid AC switch remains in a disconnected state and saves power loss of the self-charging microgrid system.

[0013] As an improvement, the EMS microgrid control system is internally provided with a control strategy and is fully responsible for the management and scheduling of each system.

[0014] The advantages of the present invention over the prior art are as follows: a self-charging control system and method based on a microgrid of the present invention uses the electric energy of the internal energy storage battery cluster of the microgrid or the diesel generator to automatically and continuously charge the power supply of the microgrid control system when the power supply is shut down, thereby avoiding the microgrid system from being unable to start after the system is shut down for a long time, thereby improving the stability and utilization efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a principle block diagram of a microgrid-based self-charging control system of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to the accompanying drawings.

[0017] The specific embodiments of the present invention are further described below with reference to the accompanying drawings, wherein the same parts are represented by the same reference numerals.

[0018] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0019] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] In conjunction with the accompanying drawings, a self-charging control system based on a microgrid includes an EMS microgrid battery pack, an EMS microgrid AC switch, an EMS microgrid control system, a diesel generator control system, a diesel generator, a diesel generator switch, an AC / DC module, a microgrid self-charging system, a DC / DC module, a BMS emergency start switch, a PCS energy storage converter, a PCS control system, a BMS DC switch, a BMS battery cluster, a BMS control system, a DCDC converter, a DCDC control system and a photovoltaic module. The EMS microgrid battery pack, the EMS microgrid control system and the BMS control system are connected through an AC bus 1, and the EMS microgrid battery pack, the EMS microgrid AC switch, the diesel generator switch and the PCS energy storage converter are connected through an AC bus 2. The EMS microgrid AC switch, the EMS microgrid control system, the PCS control system, the PCS energy storage converter, the DCDC converter, the DCDC control system and the BMS control system are connected through an AC bus 2. The system, BMS DC switch, BMS battery cluster, microgrid self-charging system, BMS emergency start switch, diesel generator control system, diesel generator switch and diesel generator are connected through a communication bus, the diesel generator switch connects the diesel generator control system and the diesel generator through an AC bus 3, the diesel generator is connected to the AC / DC module through an AC bus 4, the photovoltaic assembly is connected to the DCDC converter through a DC bus 1, the DCDC converter connects the BMS emergency start switch, the BMS DC switch, the DCDC control system and the PCS energy storage converter through a DC bus 2, the BMS DC switch is connected to the BMS battery cluster through a DC bus 3, the BMS emergency start switch is connected to the BMS battery cluster and the DC / DC module through a DC bus 4, the DC / DC module is connected to the microgrid self-charging system through a DC bus 6, and the microgrid self-charging system is connected to the AC / DC module through a DC bus 5.

[0021] The EMS microgrid AC switch is connected to a load bus.

[0022] The BMS emergency start switch and the diesel generator switch are normally open switches, and both the BMS emergency start switch and the diesel generator switch are interlocked with the BMS DC switch.

[0023] A self-charging control method based on a microgrid specifically includes the following steps:

[0024] S1. The DC / DC module is powered by the BMS battery cluster connected to DC bus 4. DC bus 6 sends the DC / DC module power to the microgrid self-charging system. The microgrid self-charging system controls the BMS emergency start switch via the communication bus. The BMS emergency start switch sends the power of the BMS battery cluster to the PCS energy storage converter via DC bus 2. The PCS energy storage converter sends the power to the EMS microgrid battery pack via AC bus 2. The microgrid self-charging system exchanges data with the PCS system and the EMS microgrid control system via the communication bus to automatically control the charging of the EMS microgrid battery pack.

[0025] S2: Send the diesel generator power to the diesel generator switch and diesel generator control system through AC bus 3, send the diesel generator power to the AC / DC module through AC bus 4, send the power of the AC / DC module to the microgrid self-charging system through DC bus 5, control the diesel generator switch through the communication bus and the microgrid self-charging system, send the diesel generator power to the EMS microgrid battery pack through AC bus 2, and the microgrid self-charging system exchanges data with the EMS microgrid control system and diesel generator control system to automatically control the charging of the EMS microgrid battery pack.

[0026] When the EMS microgrid battery pack is charging, the DCDC converter does not work and the DCDC converter only works when the microgrid is operating normally, ultimately supplying power to the load bus while charging the BMS battery cluster.

[0027] When the EMS microgrid battery pack is charging, the BMS emergency start switch is interlocked with the diesel generator switch and the BMS emergency start switch and the diesel generator switch do not operate at the same time.

[0028] When the EMS microgrid battery pack is charging, the microgrid AC switch remains in an off state and saves power loss of the self-charging microgrid system.

[0029] The EMS microgrid control system has a control strategy inside and is fully responsible for the management and scheduling of each system.

[0030] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A self-charging control system based on microgrid, characterized in that: It includes an EMS microgrid battery pack, an EMS microgrid AC switch, an EMS microgrid control system, a diesel generator control system, a diesel generator, a diesel generator switch, an AC / DC module, a microgrid self-charging system, a DC / DC module, a BMS emergency start switch, a PCS energy storage converter, a PCS control system, a BMS DC switch, a BMS battery cluster, a BMS control system, a DCDC converter, a DCDC control system and a photovoltaic module. The EMS microgrid battery pack, the EMS microgrid control system and the BMS control system are connected via an AC bus 1. The EMS microgrid battery pack, the EMS microgrid AC switch, the diesel generator switch and the PCS energy storage converter are connected via an AC bus 2. The EMS microgrid AC switch, the EMS microgrid control system, the PCS control system, the PCS energy storage converter, the DCDC converter, the DCDC control system, the BMS control system, the BMS DC switch, the BMS The MS battery cluster, microgrid self-charging system, BMS emergency start switch, diesel generator control system, diesel generator switch and diesel generator are connected through a communication bus, the diesel generator switch connects the diesel generator control system and the diesel generator through an AC bus 3, the diesel generator is connected to the AC / DC module through an AC bus 4, the photovoltaic assembly is connected to the DCDC converter through a DC bus 1, the DCDC converter connects the BMS emergency start switch, the BMS DC switch, the DCDC control system and the PCS energy storage converter through a DC bus 2, the BMS DC switch is connected to the BMS battery cluster through a DC bus 3, the BMS emergency start switch is connected to the BMS battery cluster and the DC / DC module through a DC bus 4, the DC / DC module is connected to the microgrid self-charging system through a DC bus 6, and the microgrid self-charging system is connected to the AC / DC module through a DC bus 5; The EMS microgrid AC switch is connected to a load bus; The BMS emergency start switch and the diesel generator switch are normally open switches, and both the BMS emergency start switch and the diesel generator switch are interlocked with the BMS DC switch.

2. A self-charging control method of the self-charging control system according to claim 1, characterized in that: The specific steps include: S1. The DC / DC module is powered by the BMS battery cluster connected to DC bus 4. DC bus 6 sends the DC / DC module power to the microgrid self-charging system. The microgrid self-charging system controls the BMS emergency start switch via the communication bus. The BMS emergency start switch sends the power of the BMS battery cluster to the PCS energy storage converter via DC bus 2. The PCS energy storage converter sends the power to the EMS microgrid battery pack via AC bus 2. The microgrid self-charging system exchanges data with the PCS system and the EMS microgrid control system via the communication bus to automatically control the charging of the EMS microgrid battery pack. S2: Send the diesel generator power to the diesel generator switch and diesel generator control system through AC bus 3, send the diesel generator power to the AC / DC module through AC bus 4, send the power of the AC / DC module to the microgrid self-charging system through DC bus 5, control the diesel generator switch through the communication bus and the microgrid self-charging system, send the diesel generator power to the EMS microgrid battery pack through AC bus 2, and the microgrid self-charging system exchanges data with the EMS microgrid control system and diesel generator control system to automatically control the charging of the EMS microgrid battery pack.

3. The self-charging control method according to claim 2, characterized in that: When the EMS microgrid battery pack is charging, the DCDC converter does not work and the DCDC converter only works when the microgrid is operating normally, ultimately supplying power to the load bus while charging the BMS battery cluster.

4. The self-charging control method according to claim 3, characterized in that: When the EMS microgrid battery pack is charging, the BMS emergency start switch is interlocked with the diesel generator switch and the BMS emergency start switch and the diesel generator switch do not operate at the same time.

5. The self-charging control method according to claim 4, characterized in that: When the EMS microgrid battery pack is charging, the microgrid AC switch remains in an off state and saves power loss of the self-charging microgrid system.

6. The self-charging control method according to claim 2, characterized in that: The EMS microgrid control system has a control strategy inside and is fully responsible for the management and scheduling of each system.

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