Pilot project for grid energy storage application in Unified National Energy Grid (UNEG)

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August 25–29, France, Paris


Pilot project for grid energy 

storage application in Unified 

National Energy Grid (UNЕG) 

Creating intellectual electric network is a global trend. Work in this direction has been 
successfully carried out in many countries. In order to implement a number of elements 
that will provide UNEG with new properties it is necessary to create a technological 
basis, involving international experience, and to ensure in-home development and 
production of the state-of-art electrical equipment. One of these elements is Energy 
Storage Systems (ESS) based on high power batteries.

Alexander FEDOROV (




), Head of infrastructure projects,

 Ivan ILYIN (




), the team leader of special projects,

 the Department of JSC «FGC UES» infrastructure projects


pplication of energy storage systems based on 
lithium-ion batteries is a revolutionary solution 
both in terms of convenience (mobility, 
compact size, environmental, etc.) and in 

terms of their impact on the planning and power industry 



For the normal functioning of the uni


 ed power grid of 

the country strict observance of parity between generation 
and consumption of power at any given time is required. 
The feasibility of using ESS is the ability to store electrical 
energy generated by power plants in excess during 
minimum load hours and its subsequent output to the 
network during peak hours. This provides a more uniform 

loading of generating facilities during the day and not to 
withdraw a number of power plants at night.

Moreover the use of ESS creates conditions for optimal 

network infrastructure.

In order to manufacture innovative equipment and 

develop new cooperation OAO “UES FGC” at the SPIEF 
2010 signed a Memorandum of Understanding with 
company Enerl which meant the creation of a network 
energy storage system based on high-power lithium-ion.

In 2011 JSC “FGC UES” in conjunction with “Mobile 

GTPP” (100% subsidiary) embarked on a project on 
installation of GESS at UN


G facilities. The analysis 

selected two spots for possible deployment of GESS — 

220 kV “Psou” substation in Sochi and 
220 kV “Volkhov-Severnya” substation in 
St. Petersburg.

Implementation of these projects was 

approved by the Ministry of Energy (Protocol 
of 14.11.2010 

 414 pro).



GESS on the base of high-power batteries 

consists of the following:
•   bank of batteries;
•  battery control and monitoring system;
•   converter equipment;
•   switching devices.

Each grid energy storage system at SS 

“Psou” and SS “Volkhov-North” consists 
of 5 containers: 3 containers with batteries, 

Batteries bank installed at “Psou” substation.

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info@eepr.ru,   www.eepr.ru

1 container with conversion equipment and 1 container 
with switching equipment and system control equipment. 
Given the particular sites for the installation, the SS “Psou” 
containers are mounted in two tiers, and the SS “Volkhov-
North” four containers arranged in a row. Each container is 
equipped with its own air conditioning and 


 re extinguishing 

systems and freely dismantled wheelbase so to be quickly 
transferred to any suitable location along conventional 
roads without special agreement with Road Patrol Service. 
GESS has the following characteristics presented in 

Energy storage system at SS “Psou” and SS “Volkhov-

North” can be in one of the six internet-preset modes.
1.  “Availability for island mode” — forced (by the system 

operator) transfer of the inverter into voltage controlled 

mode for rapid (within 400 ms) transfer of the 
system into “island mode.”
2. “Island mode” — dedicated load operation 
under loss of both substation auxiliary power 
supplies.  “Frequency control mode” — 
network frequency maintenance by GESS load 
shedding or increase.
3. “Power peak smoothing mode” — house load 
peak shaving, i.e. GESS power output during 
maximum consumption and consumption 
during under-consumption. 
4. “Real-time dispatch mode” — ESS dispatch 
control in the whole operation range of ESS.
5. “Charging” Mode — mode of maintaining 
appropriate levels of charge (if none of the 
modes are selected).
6. “Island mode” and  “Availability for island 
mode” are inverter voltage control modes and 
the rest modes of operation are inverter current 
control modes of operation.

Choice of lithium-ion batteries is rooted 

in a number of advantages over batteries 
with a different chemistry including the most 
convenient structure of rechargeable cells 
allowing to create any required battery capacity 
and voltage range, wide range of admissible 
discharge currents allowing to use batteries 
for a wide range of applications in the energy 
sector, a greater number of cycles of use, high 


 c power consumption permitting to 

create compact and powerful energy storage 
systems and environmental friendliness. 


In 2011 specialists of JSC «FGC UES» 

jointly with OJSC “Mobile GTPP” and JSC 
“R&D Center at FGC UES” elaborated and 
approved Program and methodology and time-
frames for energy storage systems testing.

The program included a number of 

parameters including frequency measurement 
of the output voltage when working with one or 

two inverters, measurement of the output voltage distortion 
factor, determining the ef


 ciency of inverters, de



of the transitional variation of output voltage and inverter 
voltage recovery time, study on the modes of operation as 
a power backup source in frequency control mode, in load 
shaving mode, charge and discharge from the substation 
auxiliary board. It also included checking the functioning 
of the storage in “back-to-back” mode, stability analysis 
for side-by-side operation of two inverters and determining 
the overall ef


 ciency of the energy storage.

Based on the successful results of the test it was decided 

to modernize the equipment in terms of ESS hardware 
protection improvement, as well as 


 nalization of the 

interface and installation of additional control panels for 
the operational staff of the substation.



Battery capacity, megawatt hour


AC rated power, megawatt hour


AC voltage current, three-phase, 50 Hz, kV 

0.4 +10% 

Phasor power factor

>0.95 subject to 

adjustment to +/- 

0.95 (reactive power 


Harmonic components

<5% THD (total 

harmonic distortion) 

Long-term overload capacity 

125% of rated value  

DC maximum design voltage, V 

DC 1180 V 

DC voltage range, V 

DC 720—1180 V

DC voltage ripple, % 

< 2 

Response time +1 to-1 MW, ms

< 20*** 

Inverter ef


 ciency, % 

> 95 

System ef


 ciency under double inversion, min, % 


Max stray load losses, % 

<2 of rated power 

Max limit charge/discharge rate (coef


 cient C) 



Rated inactive load, % 

<1 of rated power 

Charge/discharge cycle life 


Utilization factor (de


 ned as the ratio of hours per 

year when the plant is ready for operation to the 

total number of hours per year  (8760 hours), min: 

• for 


 rst 6 months of pilot operation 


• for the following year of the pilot operation and 

every year of commercial operation 


Notes:    *  at the end of life cycle.

            **  Warranty parameter.

          ***  Inverter response under frequency control mode. 

        ****  C coef


 cient de


 nes charge/discharge current relative to 

battery rated capacity, i.e. 2 C means current when the battery is fully 

discharged in 0.5 hour.

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August 25–29, France, Paris

During commissioning and testing of energy storage 

systems the training of personnel of substations with issu-
ing appropriate certi


 cates were carried out, a set of oper-

ating and maintenance instructions were developed.

By now all energy storage systems test completed and 

Rostekhnadzor permission for putting ESS into operation 



 eld of application: 

•  together with or instead of the mobile gas turbine 

power plants (MGTPP);

•  together with or instead of diesel generator sets;
•  oil and gas facilities;
• railway 


•  peak load power-consuming industry;
•  regions of Russia, where there is no centralized power 

supply (distributed generation);

•  RF renewables (wind power stations, tidal power 

station etc.);

•  network frequency maintenance;
•  an alternative to construction of generating capacities 

and/or expansion of network infrastructure for 
supplying electricity to remote areas;

•  essential backup power supply;
•  infrastructure development for electric vehicles.


As a result of 


 eld test experiences of energy storage 

systems based on 1.5 MW/ 2.5 MWh energy storage ca-
pacity main operating modes have been successfully ex-
plored and serviceability in the following modes has been 



Quality improvement.

 ESS can be used to improve 

power quality in case of short-term disturbances in the 

Reliability Improvement

. ESS can be used to provide 

uninterrupted power supply before start of redundant pow-
er supplies (1—10 seconds). In case of outage for more 
than a few seconds ESS is able to generate enough power 
to ensure its continuity, correct deenergizing of equipment 

Five-container ESS. Aeriai view.

and/or transition to electricity production in the territory 
of the customer. ESS can ensure uninterrupted power sup-
ply during the time suf


 cient to remedy the outage.

Network power supply reliability improvement.


This function is featured by capability to improve the reli-
ability of power supply to the network side of the meter. 
To implement this function a combination of ESS and die-
sel generator set to compensate short-term power interrup-
tions and to ensure reliability in case of long-term outages 
can be used.

Improvement of reliability of power supply to a 


 The main task of this function is to improve 

the reliability of power supply to commercial and indus-
trial consumers. To implement this function a combination 
of ESS and diesel generator set to compensate short-term 
power interruptions and to ensure reliability in case of 
long-term outages can be used.

Sustainability enhancement.

 To maintain stability of 

the power system during large disturbances caused by its 
failures that can be cleared by switchgear tripping, trans-
mitted power should be signi


 cantly below the limit de-


 ned by the static stability. It is known that the maximum 

capacity at which static stability is maintained during 
small disturbances is called a limit of static stability. ESS 
on the base of large capacity batteries can be used on the 
DC side to provide of static and transient stability.

Load curve leveling.

 Load tracking is to ensure bal-

ance of power generation and consumption in a given 
part of the network. ESS is suitable for realization of load 
curve functions as it can quickly and widely change the 
values of the output power, naturally designed to track 
falling and increasing loads. When the load is falling, ESS 
charges, when the load is increasing, ESS discharges. 

Power and frequency balancing.

 Power and frequen-

cy balancing (network load balancing) is intended to com-
pensate short-term 


 uctuations of generated power and 

frequency. ESS usage for frequency stabilization can sig-


 cantly increase the performance of existing regulators.

Voltage regulation

. One of the main tasks carried out 

by ESS is to maintain voltage at a given level 
by generating or absorbing reactive power. To 
stabilize the voltage using ESS is to compen-
sate the reactive resistance network to ensure 
the required indicators of sustainability. Using 
ESS as a voltage regulator reduces the pos-
sibility of voltage sagging and power outage 
occurrence.  This feature is essential during 
peak loads.

Due to the impossibility of reactive power 

transmission over long distances under imple-
mentation of the function, distributed ESS, 
placed at the load lumping, become of par-
ticular importance.

JSC FGC UES continues to work on the 

development of network energy storage units 
and determine the most effective places to in-
stall them.


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Creating intellectual electric network is a global trend. Work in this direction has been successfully carried out in many countries. In order to implement a number of elements that will provide UNEG with new properties it is necessary to create a technological basis, involving international experience, and to ensure in-home development and production of the state-of-art electrical equipment. One of these elements is Energy Storage Systems (ESS) based on high power batteries.


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