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Special Feature 
Newsletter "SEI WORLD" Vol.450

sEMSA™

What is sEMSA™?

Our newly developed sEMSA™ is an energy management system that enables energy consumers to optimize their energy management using a variety of distributed energy resources including renewable energies. By optimally managing and controlling functions of power generation and power storage facilities, sEMSA™ helps save energy as well as electricity costs.

For example, sEMSA™ supports leveling of energy consumption (peak shaving) and reduction of electricity costs by storing energy during nighttime when energy consumption and costs are low, and using the stored energy during daytime when the power grid is strained and energy costs are high. The sEMSA™ visualizes a wide range of information in real time, including energy consumption, which can be utilized to improve operations of business establishments and plants. The sEMSA™ can also automatically respond to demand response signals from power utilities to secure reserve capacity and level load.

With the recent increasing social demand for energy saving, many plants, companies and other large power users are expanding their use of distributed energy resource systems that utilize renewable and other energies.

The sEMSA™, which enables highly efficient energy management, thereby reducing environmental loads and minimizing energy costs, plays an important role in practicing more efficient energy management in such large-scale energy systems.  

What can sEMSA™ do?

The sEMSA™ collects energy production, storage and consumption data via the hybrid wired and wireless network, and manages energy flow to achieve optimal supply/demand balance. The sEMSA™ controls power generation and power storage facilities and loading equipment to obtain economic benefits without sacrificing consumer convenience. The measured data are collectively managed by a central control server, and real-time energy production, storage and consumption as well as trends of past power production and consumption data can be viewed on the screen.

Features of sEMSA™

(1) An original, new system developed to meet a wide variety of customer needs

We stratified the functions in energy management, and have advanced development in accordance with the architecture shown below . Each function in the strata has been modularized*1 so that the sEMSA™ can be built using only the functional modules necessary for a specific application. This makes it possible to expeditiously and inexpensively meet the various needs from large power consumers, homes and other customers and coordinate various distributed energy resources.

  Our company currently uses distributed energy resources and the sEMSA™ at Sumitomo Electric Yokohama Works, and utilizes them to help balance supply and demand in the community, responding to demand response signals.

(2) Quick demand response (DR)

Mathematical programming*2 is a commonly used technique for optimally managing two or more distributed energy resources. For this technique, we developed a new fast computational algorithm that can establish a plan for optimally managing a power system in a short cycle time and, at the same time, perform feedback control of the system to correct errors from the plan in real time. The new algorithm realizes smaller power cost forecast error and manages the power system on a real-time basis. Concerning the growing customer interest in DR as a measure for power utilities to secure reserve capacity and level off peak load, the sEMSA™ can also respond momentarily to DR signals.

(3) Optimal management of power consumption and compliance with contract power at the same time

The sEMSA™ recalculates an optimal power management plan at short time intervals and performs feedback control over sudden changes in power demand according to the recalculated optimal plan. Therefore, the sEMSA™ achieves an ideal balance between optimal power management and compliance with contract power.

(4) Support for investment recovery conditions and various other simulation functions

For business establishments considering installing distributed energy resources, the sEMSA™ simulates the specifications of distributed energy resource facilities under best investment recovery conditions. After distributed energy resource facilities are installed, the sEMSA™ manages the power under the above best recovery conditions.

*1
Module: A unit of each of the separate functions used to develop the overall functions of a system. When the input/output interface is set in advance, it is possible to change or expand the functions by replacing individual modules.
*2
Mathematical programming: A method of mathematically determining a condition that maximizes or minimizes a certain quantity under given restrictions

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