50kw All-in-one PCS Power Conversion System AC-DC Off-grid Hybrid Inverter for Energy Storage Microgrid

Our 50KW PCS is engineered for optimal efficiency and stability, ensuring reliable performance in various applications. With its adaptable modular configuration, this system offers flexibility to meet diverse power requirements while maintaining stability and reliability.

Supporting both On-Grid and Off-Grid modes, our PCS provides versatility to adapt to different environments and energy sources. Its intelligent grid management capabilities enable seamless integration with existing power systems, optimizing energy usage and distribution.

How to select PCS

The configuration of the energy storage converter is generally determined according to the actual load in the microgrid and the energy capacity of distributed generation. The load is divided into important load (computer room, office, monitoring load, etc.) and non-important load (air conditioning, lighting, boiler, gate guard load, etc.). The load data generally needs to be measured on the spot, and the time-sharing data of working days and holidays are generally measured, and the data of typical time in the four seasons are selected for comprehensive analysis.

• Capacity matching

  The energy storage capacity is configured as 1.2 times the load capacity. For example, if the critical load is 200kW, a 250kW energy storage converter is recommended. If other loads need to be operated off the grid, the energy storage power ratio should be increased accordingly.

• Energy storage converter transformer ratio

  The transformer ratio of the energy storage converter is determined by the DC voltage input range (that is, the battery voltage range). The calculation method is as follows: Transformer ratio =Ul(minimum battery voltage)/1.414. If the voltage range of the lithium iron battery is 360~480VDC, 360/1.414=254, the transformer ratio can be determined to 200. If the configuration without transformer is selected, the minimum voltage of the battery must reach 540V or more before it can be connected to the 400V grid.

• AC/DC Conversion: If the incoming power is AC and the desired output is DC, the PCS uses a rectifier circuit to convert the AC input to DC. Conversely, if the incoming power is DC and the desired output is AC, the PCS uses an inverter circuit to convert the DC input to AC.

• Control System: The PCS includes a control system that manages the conversion process and ensures that the output power meets the required specifications. This control system may include sensors to measure parameters such as voltage, current, and frequency, as well as feedback loops to adjust the operation of the PCS accordingly.

• Switching Components: The PCS typically includes switching components such as transistors or thyristors that control the flow of electrical current through the system. These switching components are turned on and off rapidly to modulate the output voltage and frequency as needed.

• Bidirectional Operation: Many PCSs are designed for bidirectional operation, meaning they can convert power in both directions (e.g., from AC to DC and vice versa). This is particularly common in energy storage systems, where the PCS may need to charge or discharge batteries depending on the state of the system.

• Grid Connection: In grid-connected applications, the PCS interfaces with the electrical grid to either supply power to the grid or draw power from it. The PCS ensures that the power output is synchronized with the grid's frequency and voltage to maintain grid stability.

• Safety and Protection: PCSs include safety features to protect the system components and operators from overvoltage, overcurrent, short circuits, and other electrical faults. These protections help prevent damage to equipment and ensure safe operation.

  
  

Basic control function

• Grid-connected constant power charge and discharge control 

• Grid-connected constant voltage current limit charging 

• Off-grid V/F control 

• Reactive power regulation control 

• Grid - off-grid smooth switching control

• Anti-island protection function and island detection mode switching function fault crossing control function

PCS plays a crucial role in different application scenarios.

1. In microgrids, PCS connect the battery storage system to the grid to manage the flow of energy. When the photovoltaic system generates enough electricity, PCS prioritizes meeting the load demand, and then stores the excess electricity in the battery, and then sells the excess electricity to the grid. If the power generated by the photovoltaic system is not enough to meet the demand or the photovoltaic system is not working, PCS will give priority to the use of battery power supply, and then by the grid power supply when the battery power is insufficient. When photovoltaics and batteries are unable to supply power, the grid will serve as a backup power supply.

2. In such a system, photovoltaic energy is preferentially stored in the battery for subsequent use. When the photovoltaic energy is insufficient, the energy storage battery will supply power to the load, and if the battery energy is also insufficient, the diesel generator will intervene to supply power.

3. When the mains power is off, PCS can automatically switch to off-grid mode to ensure that the load is constantly powered. It supports off-grid black start, ensuring that critical loads can be powered in case of an emergency.