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Maintaining control of distributed power producers

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Ensuring grid stability is becoming increasingly complex

The vast number of small distributed power producers calls for new strategies to ensure consistent power quality. Identifying, locating, and eliminating disturbances and faults as well as the flexible, quick balancing of power production and load consumption require integrated hardware and software solutions that work smoothly together.

Efficient solutions for distributed power generation systems

Quick and reliable ways to control large numbers of small power producers

The steadily growing share of small power producers in the energy mix affects power quality. Municipalities and grid operators have to react in order to optimize the grids.

Power grids are becoming increasingly complex: The growing number of small distributed power producers also affects the workload grid operators have to master to maintain grid stability. Siemens supports the work of municipalities and DSOs with integrated solutions. Networked devices and high-performance software enable rapid, predictive action to prevent disturbances and faults before they arise.

Find out more in detail under the following topics

Concepts for voltage and capacity management

Siemens offers state-of-the-art and economic solutions to efficiently manage voltage increase and overload situations throughout all voltage levels.

Grids are increasingly affected by varying load and feed-in conditions with significant fluctuations in operating voltage. Operators benefit from Siemens’ intelligent design concept for managing voltage and capacity in power grids – without having to invest in costly grid expansions. 

 

The solutions utilize various approaches to voltage control, depending on the given structures and conditions on-site and in the field. Customized solutions help to achieve maximum efficiency in the entire medium-voltage grid. They also ensure regional and local voltage and grid stability right down to the low-voltage range.

 

Benefits for grid operators

  • Minimization of new investments through efficient use of existing structures
  • Improved capacity utilization of medium- and low-voltage grids
  • Optimized use of the voltage range with just a few distributed measuring points
  • Automatic monitoring of grid status for operation and planning

Products and components for smart voltage and capacity management

Harmony in the grid – through optimized power quality management

Integrated power quality management solutions from Siemens help to avoid the negative impact of harmonic loads on industrial facilities and residential areas.

Owing to the growing volume of electricity generated by distributed power producers, grid operators will have to monitor harmonic loads (e.g. due to potentially defective inverters) more closely. Such effects can negatively impact nearby industrial operations, and even television reception and computers in residential areas. Power grid regulatory authorities in many countries already demand compliance with EN 50160 as key performance indicators for power distribution systems.

 

Benefits for grid operators

  • Automatic recognition and reporting of relevant events
  • Reporting and recording in accordance with EN 50160
  • Cost-efficiency through custom-fit solutions
  • Optimized ease of operation thanks to preprocessing of data

Product highlights for harmony in the grid

Controlling and balancing distributed generation efficiently

Imbalances between generation and load caused by excess supply or lack of generated power need to be managed reliably and cost-efficiently.

Coordinated scheduling and dispatch of distributed energy resources, including energy storage, helps tackle overload situations and voltage problems, and at least balance generation and load. The most efficient manner is to gain access to the distributed energy resources to balance the infeed in combination with the load via a control system. Many industrial processes allow not only a shutdown for load reduction, they also facilitate increased consumption during a high power production period as well. These actions can avoid investments into the grid expansion.

 

Benefits of balancing generation and load

  • Avoiding shutdowns
  • Compliance with rules and regulations
  • Stable grid
  • Reduce investments into the grid expansion

Products for controlling distributed power producers

Advanced monitoring with real-time state estimation

Economic solutions for the real-time monitoring of substations without measuring equipment.

Distributing various measuring devices throughout the entire distribution grid is a question of time and money. Strategically critical and important local distribution substations are the first locations to be equipped in order to optimize such deployment from an economic standpoint. Real-time state estimation performs an important function in this process, enabling that portion of grid substations that are not equipped with measuring devices to be mapped and considered.

 

Benefits for grid operators

  • Economic real-time state estimation calculated centrally or on a distributed basis
  • Advance detection of critical grid situations
  • Load demand history and load flow diagrams
  • Voltage level monitoring 

Highlight products for real-time state estimation

Detecting, locating, and correcting disturbances and faults by means of data evaluation

Evaluation of existing data can help to identify and correct wrong parameterization of PV inverters.

As a consequence of expanded use of regenerative energy sources, photovoltaic (PV) systems are generating an increasingly large share of our electric power supply. This creates new sources of disturbances and faults in the distribution systems that can negatively impact grid stability. A new approach to the evaluation of existing data, however, provides the means for rooting out and eliminating these disturbances and faults.

 

Benefits for grid operators

  • Validation of PV inverter parameters such as voltage and reactive power behavior to identify faults and disturbances caused by erroneous parameterization
  • Graphic visualization of disturbances and faults for easy adjustment of inverter settings
  • Analysis and elimination of sources of faults and disturbances in power grids 

References

Solutions tried and proven in reference projects

Integrated solutions from Siemens help municipalities and distribution system operators (DSOs) to comfortably manage distributed power producers. Listed below are just some of the reference projects.

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