Key Technologies for Energy Storage Converters or Power Conversion System (PCS)

Definition and Principle of PCS

A Power Conversion System (PCS) is a device that converts electrical energy from one form to another. In lithium iron phosphate battery energy storage system (BESS), PCS is mainly used to convert electricity from direct current (DC) to alternating current (AC) generated by renewable energy devices such as solar panels, wind turbines, etc., and to convert AC to DC again when storing electricity, in order to achieve efficient storage and utilization of energy. The core principle is to adjust the parameters such as frequency, amplitude and phase of the current through the converter, so as to realize the conversion between different forms of electrical energy.

Functions and characteristics of PCS

As an important part of BESS, PCS has the following main functions and characteristics:
●  Electrical energy storage and conversion:

PCS can effectively convert and store electric energy generated by energy storage system (ESS), so that the unstable DC energy can be stabilized and fed into the power grid, or absorbed from the power grid for storage when needed.

• Energy balance control:

In energy field, energy generation and consumption need to be balanced, and the volatility of renewable energy can affect energy balance. PCS can realize the energy balance control according to demand of the grid and the ESS to ensure stable operation of the whole energy system.

• Grid stability improvement:

The instability of renewable energy may affect the stability and reliability of the power grid. PCS can respond quickly and make adjustments when the grid frequency, voltage and other parameters fluctuate, thus improving the stability of the grid.

• Frequency and capacity adjustment:

PCS can balance the power system’s frequency and capacity by adjusting charging and discharging rate of the energy storage cabinet/container to smooth out the grid load, to maintain frequency stability of the grid.

• Reactive power control:

PCS can also control the phase of the current to realize control of reactive power, so as to improve power factor of the grid and reduce energy loss.

Application scenarios of PCS

PCS has a wide range of applications in renewable energy sector, mainly focusing on the following aspects:

• Renewable energy power generation:

Energy storage converters can also control the phase of the current to realize the control of reactive power, thus improving the power factor of the grid and reducing energy loss.

• Grid scheduling and peak/valley balancing:

The storage converter can also control the phase of the current to realize the control of reactive power, thus improving the power factor of the grid and reducing energy loss.

• Micro-grid and power storage system:

In some remote areas or independent power grids, the energy storage system can be combined with solar panels and other equipment to build a micro-grid or PV energy storage system to achieve independent power supply from renewables.

Sinostorage’s LiFePO4 battery energy storage cabinets and containers come with own advanced patented PCS. If you are looking to getting a reliable, cost-effective energy storage system , you can rely on us.