Siemens Power Engineering Guide 7E 56

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7/30/2019 Siemens Power Engineering Guide 7E 56

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Power Transmission and Distribution Solutions

56 Siemens Energy Sector t Power Engineering Guide t Edition 7.0

2.8 SIESTORAGE

2.8.1 The Modular Energy StorageSystem for a Sustainable Energy

Supply

The challenge: reliable energy supply! Distributed, renewable

energy sources, such as wind turbines and photovoltaic plants,

are making a bigger and bigger contribution to the energy mix

of the public power supply (fig. 2.8-1). However, as the amount

of electrical power they generate cannot be predicted, their

increasing use is creating new challenges in terms of system

stability, integration into the power supply system, operating

reserves, quality of voltage and supply, as well as peak load

management.

The answer: SIESTORAGE – Siemens Energy Storage – the

sustainable and eco-friendly solution! Energy storage systems

are the right solution in all these cases. SIESTORAGE ensures a

sufficient amount of available reserve power for balancing and

regulation purposes, especially of renewable energy sources,

and creates higher system stability for industry, buildings and

infrastructure. Energy that is stored by the system can be

regained in case of demand. Generation outages can be com-

pensated for minutes and even for hours on end. SIESTORAGE

combines cutting-edge power electronics for power system

applications with high-performance lithium-ion-batteries. With a

compact battery and converter cabinet as the smallest unit, the

capacity of the SIESTORAGE system can be expanded to up to 2

megawatt hours, and its output up to 8 megawatts (fig. 2.8-2).

The advantages at a glance

The SIESTORAGE energy storage system from Siemens is ideally

suited to various applications. Compared to other energy storage

solutions, it has a number of additional advantages, such as:

tȋ High degree of availability and reliability thanks to modular

design

tȋ Suitable for all requirements due to highest flexibility

tȋ Easy handling of battery modules (safe low voltage) ensures

the highest degree of safety for system an persons

tȋ Completely integrated turnkey solution thoughout the entire

life cycle

tȋ Parallel connection of energy storage cabinets on AC side

ensures the highest flexibility

tȋ Prowen expertence in power electronics for power system

applications

tȋ Black start capability for microgrid application

tȋ Emissions-free solution and improvement of CO2 footprint

Always the right storage solution

Modular design (fig. 2.8-3)

SIESTORAGE is a modular energy storage solution. Batteries and

control electronics are inserted in cabinets as plug-in units. One

energy storage cabinet contains up to 16 battery modules, each

Fig. 2.8-1: SIESTORAGE offers solutions for distribution systems with

a high share of distributed renewable energy sources

Powerful combination:

Cutting-edge powerelectronics and high-powerLi-ion batteries

Variable through modularity:

In power and capacity withparallel connection ofcombined energy storagecabinets on the AC side

Adequate capacity:

Up to about 2 MWh

Top performance:

Modular up to about 8 MW

Power system

AC/DCinverter

Filter

Transformer

Medium-voltage switchgear

Li-ionbatterysystem   n

   c   e   l   l   s

   i   n

   s   e   r   i   e   s

   S   I   P   L   I   N   K

Smart Network Control

Invertercontrol

Data logging

Batterymanagement

System control

Fig. 2.8-2: A modular energy storage solution based on proven

components

with a maximum voltage of 60 V DC. The individual battery mod-

ules can be pulled out, inserted and moved safely. The required

power and capacity are achieved through a parallel connection

of several cabinets on their AC side. Both parameters can be

adapted to fit the particular requirements of a project.

The intelligent Battery Management System (BMS) monitors

state of charge, voltage and temperature of the individual

battery modules, among others. SIESTORAGE’s core is the SIP-

LINK converter product platform. The batteries are charged and

discharged at the AC system using SIPLINK active front ends. The

SIPLINK power electronics were developed especially for sophis-

ticated system applications such as MVDC system couplings, and

are the basis of the various SIESTORAGE applications.

The control components for the entire storage unit are accom-

modated in a separate cabinet. A combined control and system

connection cabinet is used for up to four energy storage cabi-

nets. The system is controlled with SIMATIC S7, either on site or

over the Internet. Information on the system’s operating state,

for instance on batteries, auxiliary systems, medium-voltage

switchgear and error messages, are displayed on the human

machine interface (HMI).