Amprion commissions new Statcom facility

30.09.2020

The rising share of volatile renewable electricity generation and the increasing transmission distance from the places of generation to the centres of consumption require power grids to be adjusted, with immediate voltage regulation being a key element. To balance out voltage fluctuations, which are more and more occurring at the grid nodes, the European transmission system operators (TSOs) employ reactive power compensation systems. German TSCNET shareholder Amprion is no exception and already using a wide range of innovative technologies. On 29 September 2020, the company commissioned one more Statcom (static synchronous compensator) system, in this case on the site of the Kusenhorst substation in Haltern am See in the federal state of North Rhine-Westphalia. Almost exactly one year ago, Amprion commissioned an identical system at the Kriftel substation between Frankfurt and Wiesbaden in Hesse.

Amprion has invested a total of €37m in the expansion of the Kusenhorst substation. According to demand, the Statcom system can feed in reactive power in the range of about 300Mvar, thus raising or lowering the voltage in the grid to contribute to grid stability. The new Statcom can also be combined with the mechanical switched capacitor with damping network (MSCDN) already on site in Kusenhorst. Together, the two technologies form a so-called hybrid facility for reactive power compensation, making it the most powerful of its kind in the German grid alongside the Kriftel substation.

The Statcom system consists of several building sections, which are up to ten metres high and cover an area of approximately 1,000m². They contain the converter, chokes, and the regulation and protection technology. The transformer and the external cooler of the system are outside the buildings. Amprion operates the Statcom system remote-controlled via its system operation and control centre near Cologne.

Amprion has commissioned a Statcom system for reactive power at its Kusenhorst substation (picture: Amprion)

Linkup
> See Amprion press release, in German (html)

See article on single page

Amprion: “Smart Valve” for flexible power flow control

05.08.2020

To maintain the stability of the transmission grid despite the current increase in decentralised and volatile generation, the German transmission system operator (TSO) Amprion – like many other TSCNET shareholders – is already using a wide range of innovative technologies, for instance Phase-shifting transformers (PSTs) or reactive power compensation systems such as Statcom. A promising pilot project has now additionally been launched, for which Amprion has signed a cooperation agreement with the US Silicon Valley company, Smart Wires. In the three-phase project, the mobile modular static-synchronous series compensator (mSSSC) developed by Smart Wires, the so called SmartValve, will be deployed in the Amprion grid.

The aim of the project is both to increase the transmission capacity of Amprion’s transmission grid and to maintain its high level of system stability. SmartValve is designed for a more balanced and thus more efficient use of power lines. By actively changing the power flows, it enables better control of the transmission system and minimises redispatch. Due to its modular structure, SmartValve is easy to transport and can be operated flexibly at different locations. This distinguishes the new technology from conventional PSTs, for example, making it an ideal complement to support the system from a stability perspective.

Dr. Klaus Kleinekorte, CTO at Amprion, refers in this context to the significantly increased costs for redispatch in Germany in recent years due to the changes in the energy landscape. This is where the SmartValve project comes in: “We see this innovative technology as having the potential to allow us to use the network more efficiently and reduce the need for redispatch.” The two partners expect the project to span two to three years to verify the added value of the new technology in the Amprion grid.

Amprion and Smart Wires launched a pilot project to implement the SmartValve solution in the transmission grid (picture: Smart Wires)

Linkup
> See Amprion press release (html)

See article on single page

Amprion develops rotating asynchronous phase shifter

27.03.2020

When conventional power generation declines, additional technical measures are needed to ensure the stability of the electricity grids. The energy transition in Germany is prompting the four German transmission system operators (TSOs) to take compensatory measures to keep the grid voltage at the required level. An essential factor in maintaining voltage is reactive power, and TSOs respond to changes in the energy landscape by installing reactive power systems to compensate for the loss of reactive power previously provided by conventional power plants. Reactive power is particularly required for the AC transmission of large amounts of energy over long distances. This is likely to be a common practice in the energy future of Germany.

The German TSO Amprion and Siemens Energy plan to develop and install the world’s first rotating asynchronous phase shifter with a high output of approx. 300MVA. The innovative device is called ARESS: Asynchronous Rotating Energy System Stabilizer. It represents a new and fully integrated technology. In contrast to synchronous phase shifters, ARESS supplies far more rotation energy, especially when providing momentary reserve, and also over a longer period of time. The extremely responsive and powerful electrical equipment thus significantly contributes to frequency stability. ARESS is intended to complement and further develop the Statcom (static synchronous compensator) systems and synchronous phase shifters that are currently in use.

The ARESS project was launched on 26 March with the signing of an agreement by Dr. Klaus Kleinekorte, CTO of Amprion, and Dr. Jochen Eickholt, managing director and designated executive board member of Siemens Energy. Due to the Corona pandemic, the documents were signed via video conference. The technology partners are convinced that the ARESS technology can be designed much more cost-effectively and compactly than combinations of available technologies in the same scope of application. Amprion and Siemens Energy expect the project to run for four years until the pilot system can be put into operation.

Amprion and Siemens Energy are developing the rotating asynchronous phase shifter ARESS to provide reactive power (exemplary image of a rotating phase shifter: Siemens)

Linkup
> See Amprion press release, in German (html)

See article on single page

Germany’s first hybrid Statcom facility in operation

27.01.2020

Since January 24, Germany’s first hybrid static synchronous compensator (Statcom) system is connected to the power grid. For about two years, TSCNET shareholder TenneT, the Dutch-German transmission system operator (TSO), has been modernising its long-established substation in Borken, in the German state of Hesse, practically at the centre of the German transmission system. The heart of the conversion work was the installation of the Statcom system. Due to the limited space available at the site, TenneT decided to build the Statcom system in hybrid construction, thus reducing the additional space requirement to less than one hectare.

With the high-performance technology in operation, TenneT uses the historic substation in Borken, which boasts a tradition of almost a hundred years, for a task that will contribute significantly to the success of the energy transition: the provision of dynamic voltage support and reactive power to compensate for the decreasing capacities previously provided by large power plants that are being successively shut down. The TSO invested around €30m in the Borken substation, that now has become one of the most modern hubs for green power in the German grid.

Last Friday, Axel Schomberg, Head of TenneT Grid Operations, together with high representatives of local politics, officially commissioned the Statcom system, underlining the significance of the facility for the energy transition. In combination with the numerous other reactive power compensation systems operated in the 129 German TenneT substations, including compensation coils, MSCDN systems and the first rotating phase shifter in the German power grid at the time of installation, the Statcom system contributes to the static reactive power supply.

TenneT has commissioned Germany’s first hybrid Statcom system (picture: TenneT)

Linkup
> See TenneT press release, in German (html)

See article on single page

Amprion commissions state-of-the-art technology

01.09.2019

The Kriftel substation between Frankfurt and Wiesbaden in the German federal state of Hesse controls power distribution for the greater Frankfurt area with its almost six million inhabitants. The station is operated by TSCNET shareholder Amprion, one of the four German transmission system operators (TSOs), which has been expanding and modernising it since 2016 and has invested a total of around €34m. During a ceremony held on 30 August with representatives of state and local politics, the new, state-of-the-art equipment in Kriftel was put into operation.

Amprion’s substation not only secures the power supply in the northwestern Rhine-Main area but will now also play an important role in providing reactive power. The installation of the relevant technology in Kriftel became necessary due to the changes in power generation and feed-in in Germany. The declining reactive power capacities of large power plants, which are now being successively taken off the grid in the course of the energy transition, must be compensated by the national TSOs to keep the reactive power in balance with the active power and thus keep the grid voltage at the required level.

The hybrid reactive power compensation system installed in Kriftel is the most powerful of its kind in the German grid. It consists of two units: a static synchronous compensator system (Statcom) and a mechanical switched capacitor with damping network (MSCDN). Depending on requirements, they can raise or lower and secure the voltage in the grid. Dr. Klaus Kleinekorte, CTO at Amprion, explained the importance of the new system technology: “By optimising the switching of many electronic modules, the new hybrid system in Kriftel will help to keep the voltage level in the grid stable and thus continue to guarantee a high level of supply security in the region.”

Amprion commissions the modernised Kriftel substation (picture of a Statcom system as installed in Kriftel: Siemens)

Linkup
> See Amprion press release, in German (html)

See article on single page

50Hertz to improve grid utilisation

29.08.2019

To respond to current and future transmission system requirements, operators can either expand the grid or optimise its utilisation – ideally, they do both. TSCNET shareholder 50Hertz, one of the four German transmission system operators (TSOs), is also facing up to the challenges arising from the higher capacity load on the existing grid. The TSO presented its innovative assets and concepts at the System Security Conference (“Systemsicherheitskonferenz”), which is held every two years by 50Hertz.

This year’s conference on 28 August, the 11th edition, attracted almost 150 participants from the energy industry, science, politics and administration to the Berlin headquarters of 50Hertz, where they were welcomed by 50Hertz CEO Dr. Frank Golletz, who also plays the role of the company’s CTO. Golletz explained how the TSO tackles the technical challenges using previously uncommon technologies such as static compensators (STATCOM), series compensations, back-to-back converters or static and rotary phase shifters. “With these assets, our grid becomes a highly dynamic grid in which the power flow is actively controlled,” commented Golletz.

In addition, Golletz argued that, alongside to the indispensable technical innovations, the rules on the energy market should also be continuously further developed. It is important to set the right incentives for all market participants so that the electricity market not only functions from a business point of view, but also keeps an eye on the entire economy.

50Hertz has held its 11th System Security Conference in Berlin, Germany (picture of headquarters: 50Hertz)

Linkup
> See 50Hertz press release (html)

See article on single page

Transformer for TenneT’s hybrid Statcom facility

01.01.2019

Right on time for Christmas 2018, a heavy-duty train loaded with a 299-tonne transformer built by ABB reached the Borken substation operated by TSCNET shareholder TenneT, the Dutch-German transmission system operator (TSO). Here at the long-established substation site in Borken in the German state of Hesse, practically in the middle of the German power system, the TSO is currently building the first German hybrid static synchronous compensator system (Statcom). In order to efficiently connect the Statcom system, which will later be operated at 40kV, to the existing extra-high voltage grid, a so-called impedance matching transformer is required.

The hybrid Statcom facility will provide reactive power as compensation for the declining capacities previously provided by large power plants, which are now being successively taken off the grid in the course of the energy transition. In the three-phase transmission system, the reactive power must be in balance with the active power in order to maintain the grid’s voltage at the required level. That is why reactive power compensation is a priority task for the German TSOs.

On the morning of 8 January 2019, the foundations of the transformer will be laid in front of the Statcom plant which is currently under construction. It will then take around three months before the matching transformer is operational. The entire Statcom system is expected to be commissioned by the end of 2019. In Borken, TenneT is investing around €30m in future-proof grid operation. Germany’s first hybrid Statcom system will then not only contribute to dynamic voltage stabilisation, but the entire Borken substation will also become one of the most modern hubs for green power in the TenneT grid.

TenneT has been supplied with a matching HDVC transformer for its hybrid Statcom facility at the Borken substation (picture: ABB)

Linkup
> See TenneT press release, in German (html)

See article on single page

First hybrid Statcom facility in Germany

26.04.2018

In the three-phase transmission system, reactive power must be in a well-balanced ratio to active power in order to keep the grid’s voltage on the required level. Without reactive power, the transmission of electricity would not be possible. In the “old” German energy landscape, mainly nuclear and other large power plants have been providing reactive power capacities. Since in the course of the energy transition more and more of these facilities go off the grid, the four German transmission system operators (TSOs) respond with the installation of reactive power compensation systems.

An outstanding example of this is given by TSCNET shareholder TenneT, the Dutch-German TSO, which is expanding the traditional Borken substation in the northern part of the federal state of Hesse to one of the most modern green power hubs of its grid. Here in Borken, practically in the middle of the German power system, the TSO is currently constructing a hybrid static synchronous compensator (Statcom) plant. From the end of 2019, the state-of-the-art facility will dynamically support the mains voltage and provide reactive power at 380kV level, thus making an important contribution to secure grid operation after the shutdown of the large power plants.

The Statcom plant in Borken, with its hybrid construction, will be the first of its kind in the entire German electricity grid. A mayor advantage of this system is its small space requirement ‒ in comparison to its wide reactive power control range. This considerably reduces the environmental impact. In the particular case of Borken, the renaturation of a nearby river has now become possible. Other reactive power compensation measures of TenneT include the new substation Bergrheinfeld/West with its phase shifting and direct coupling transformers. In addition to building new facilities, TenneT is also exploring other ways to provide reactive power, such as utilising wind power and photovoltaic systems.

> See TenneT press release, in German (html)

 

Picture: TenneT

See article on single page