Delta ESS applications in IoT

Text by: ESDBD

The discussion of energy issues in recent years has given ESS an increasingly important role. Aside from smart grids and the improvement in power supply reliability with renewable energy, IoT can also provide data warnings, instant control and other scenarios. In this issue of “IoT-Based Smart Green Solutions”, we are happy to share firsthand information from the ESDBD that introduces the diverse IoT applications of ESS.

Smart Grid
The smart grid has developed over the years, where ICT and analog or digital technologies are used to collect supply-end power supply data and load-end consumption data. This allows power companies to understand the performance of power supply and consumption, which they use as reference for power allocation planning.

In recent years, the demand for new power plants has increased due to the rise in the peak load of the supply of power. Power grid instability is also worsening due to the increase in the proportion of power supplied by renewable energy power plants. These all have an impact on the continued operations of commerce and industry. Delta’s Battery Energy Storage System (BESS, also referred to as ESS) is now being considered by business owners for its more efficient adjustment and its power supply. Its main application range includes: renewable energy balance, frequency regulation, micro-grid, commercial and industrial applications, home/residential ESS, and others.

The main application scope of a Li-ion energy storage system (ESS).

Smart ESS
An ESS must respond to the site load or actual changes in the grid, and work with IoT technologies to achieve instant control. The smart functions are divided into external and internal system operations. The internal system controls the operating status of the battery energy storage system (BESS), with many built-in sensors of various functions to obtain battery conditions, cabinet (IT rack cabinets) interior ambient data (humidity, temperature, and others), signals of the warning system, and more. It automatically controls the air conditioning system and the fire system, manages and protects the battery, and provides feedback through an Internet connection. Business owners can instantly process, respond and allocate through remote control. The external functions use the smart meters on the main power circuit device to read the power consumption and supply data, and conduct smoothing for the renewable energy output, frequency regulation, load shifting and other functions using the algorithm planned by the built-in site controller based on the business owner’s demands.

Delta’s ESDBD has completed several successful projects in the application of renewable energy and micro-grids. In 2017, the Taiwan Power Research Institute in Shulin installed its first grid-level ESS. By the end of 2018, two more systems were installed and in operation. One is the Kaohsiung Yongan PV power plant, and the other is the Chinese Petroleum Corporation (CPC) Smart Green Energy Gas Station in Chiayi.

1.Kaohsiung Yongan PV Power Plant
The Kaohsiung Yongan PV Power Plant, built in 2011. The total area is 9.45 hectares, with a PV capacity of 5 MW, and an overall annual power generation of about 6 million kWh.

However, to improve PV power generation efficiency, to build a 1MW/ 1.1MWh ESS. This ESS improved PV power generation performance with PV smoothing, frequency regulation, and the reduction of stress on the grid created by violent variations in renewable energy power.

ESS helps reduce the variation rate of output power generated by solar power (PV smoothing).

The power generated from renewable energy and ESS operating status onsite are sent back to the command center through the cloud. The client can learn about and evaluate the generation and storage performance here. In case of any abnormal signals from the ESS itself, instant diagnostics and simple handling processes are accessible via remote control. Based on the diagnostic results, staff can arrange to bring proper gear onsite for repairs.

ESS installed at the Kaohsiung Yongan PV plant.

2.CPC Chiayi Smart Green Energy Station
CPC has recognized that there is an increasing demand for the charging of electrical vehicles in Taiwan, particularly electrical scooters. A Chiayi Xinyi gas station became a smart green energy demonstration site after being equipped with 100kW PV capacity, a quick-charge/go station for electrical scooters, and Delta’s 250kW/ 500kWh ESS.

The Delta ESS installed at the CPC Smart Green Energy Station demonstration site seen at the opening of the station.

This is an example of a micro-grid in operation. The ESS stores renewable energy, supplies high power for electrical scooter quick-charging and the power consumption of the gas station operation. For power generation, storage and supply applications, clients access related information and conduct analysis via remote control over the Internet, while staying in contact with Delta. This allows the overall system to perform as expected, and to become a reference for future green gas/charging station installations.

For industrial or commercial power consumption cases, Delta is also in talks with potential business owners. Industrial or commercial power demands often involve daily maintenance costs, value supply stability, and demand response.

Power supply stability: An ESS is a buffer between the grid and the load. If the load on the grid is suddenly reduced, the load end can still operate normally through the ESS. This avoids a sudden load reduction that may result in the power being tripped off, business losses, or even danger to personal safety, in locations such as at department stores, shopping malls, airport terminals, or other transportation ground support operations.

Demand response: The load end has a distinct behavior for power consumption during peak hours. To avoid overloading on the load end, a high number of contract violation fines may accrue. The load end and the power company often negotiate on contract power consumption using peak hour standards which increase power consumption costs and have low benefits for the operation of the grid. The introduction of an ESS balances peak hour consumption and lowers the contract power consumption standard in the long term. This reduces power consumption costs for business owners, and increases power consumption efficiency.

As in the descriptions above, industrial and commercial power consumption require instant collection and analysis of data for regulation. Delta’s ESSs are all equipped with external communications ports, so that business owners can easily access information online that can provide a basis for strategic decision-making.