Smart digitalization of energy

A key component of our energy projects that ensures economic benefits is our own intelligent system for the management and evaluation of energy data, with a subsequent management of production, storage, and consumption of energy in your network.

The whole system consists of:

• at its heart, the Clever BES battery storage with its ESM system featuring a user interface for both network operators and energy traders
• a precise network analyzer with a quality meter (accuracy class 0.5/5A/3.2 kHz sampling frequency IEC62053-22)
• a dispatch system with an RTU unit for controlling connections to the distribution network
• smart meters with a security gateway operating in real-time consumption measurement mode
• an Energy Data Management (EDM) system

The ESM periodically collects operational data from converters, batteries, and the actual consumption of the facility both at the point of consumption and for individual subnetworks using smart meters. Through the EDM, this data is sent to the ESM for further processing. ESM then remotely controls the BES and other controllable elements of the energy network through configuration commands.

ESM provides customers with a web interface where they can see all their facilities, their current operational data, graphs of historical values, market energy prices, and their settings.

For each facility, you can see:

• Current consumption
• Battery storage charging/discharging performance
• Available battery storage capacity
• Photovoltaic production
• Total harmonic distortion by phases including K factor and other information

Basic quick statistics of these values for the previous month, week and day are available.
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BES+ Remote Setup

Authorized users can change BES+ settings for regulation and control, such as:

• Regulation target
• Maximum charging power
• Maximum discharging power
• Maximum permitted overflow

These parameters can also be set with time resolution within a so-called timetable to account for the regulatory mode specifically for time intervals. Contextual data such as cloudiness information for the location and spot markets at OTE are available for these settings.

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Examples of BES ESM applications

Elimination of photovoltaic overflows

The client utilizes the storage system to eliminate overflows to the network, with the difference between the currently consumed energy and the energy produced from PV being stored in BES+.

The graph illustrates a situation where approximately from 9:00 to 14:30, the current amount of energy produced from PV is greater than consumption, and the surplus energy is stored in BES. The battery's State of Charge (SOC) increases from the initial 9% to 50% during this period. The stored energy is then utilized when consumption exceeds PV production from 14:30 to 19:00. It's also possible to delay the use of accumulated energy to times when energy prices are higher (daily SPOT).

Power management (loadbalancing)

BES+ regulates the network draw to meet a specified regulation target. If the client's current consumption exceeds the set regulation target, BES+ will reduce the power of regulated appliances (for example, EV charging stations) or supply the necessary amount of energy. This functionality allows for modeling the consumption diagram over time, with the aim of drawing energy during intervals when the price level is more favorable.

Reserved capacity management (peakshaving)

BES+ operates in a reserved capacity management mode with the goal of not exceeding the permitted value (peak shaving – the yellow curve in the graph). In cases where consumption growth begins to approach the level of contracted reserved capacity (the red curve), BES+ starts to supply energy to maintain network draw at the specified target level. This case is often used by clients utilizing charging infrastructure for electric vehicles and other appliances, where consumption can exceed the reserved capacity multiple times within a short interval, and where it is additionally difficult to plan this consumption.

Reduction of consumption pattern costs (Demand Shifting, SPOT Trading)

The client utilizes the storage to overall reduce the cost of the consumption pattern by taking advantage of SPOT prices from intraday trading.

The reduced price in the time interval from 3:00 to 9:00 is used to charge BES+ (blue) to a consumption level close to the reserved capacity at the lowest prices of the day. From 9:00 to 17:00, BES+ is inactive, only the energy produced from PV (green) during this period is immediately consumed. In the period between 17:00 and 20:00, when the energy price is the highest, approximately double compared to the morning prices (see small graph on the left), consumption from the network (yellow) is reduced to a significantly lower level and BES+ covers the consumption. This operation ensures the client reduces the cost of the total daily consumption.

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Higher Harmonics Filtering

Higher harmonic currents can cause additional losses in the core and windings of a transformer, leading to increased heating. This heating can shorten the lifespan of the transformer and lead to its premature failure. By eliminating higher harmonic currents, we can prevent outages of machines and other equipment operated in the local network, thereby improving the operational quality of production lines at manufacturing enterprises. Once THD (Total Harmonic Distortion) reaches 3%, the higher harmonic currents filter is activated.