Power supply systems – find manufacturers and suppliers

Power supply systems are used to generate, convert, store, distribute and supply electricity to a wide range of consumers such as households, businesses, industry, public facilities and critical infrastructures.

They are central technical systems for the safe, reliable and efficient provision of electrical energy. Their construction and operation are subject to strict technical, economic and legal requirements, as electricity must be available in the required quantity and quality at all times.

Below you will find information on how power supply systems work, their use and areas of application, as well as an overview of developments and challenges in this area:

How power supply systems work:

The functioning of a power supply system can be divided into several coordinated sub-processes:

Power generation:

Electricity is generated by converting primary energy into electrical energy. Various technologies are used for this:

1. Conventional generation: In power plants (e.g. coal, gas or nuclear power plants), thermal energy is converted into mechanical energy (via steam turbines) and finally into electrical energy (via generators).
2. Regenerative generation: Photovoltaic systems convert sunlight directly into electricity. Wind power plants use the kinetic energy of the wind.
3. Hydroelectric power plants use the high-altitude energy of water. Biomass and geothermal energy are also sources of electrical energy.
4. Decentralized generation: Small systems such as solar panels on residential buildings or combined heat and power plants generate electricity close to the consumer.

Electricity conversion:

The electrical energy generated must be adapted for transportation and use:

1. Voltage conversion: transformers increase the voltage to minimize line losses for transport (e.g. from 20 kV to 110-380 kV) and lower it again before use.
2. Alternating/direct current conversion: Some generation systems (e.g. PV systems) generate direct current, which is converted into alternating current by inverters.

Electricity transmission:

Transmission takes place via a hierarchically structured grid:

1. Extra-high and high-voltage grids 220-380 kV or 110 kV: For long transport distances between generators and consumption centers.
2. Medium-voltage grids 10-30 kV: Connection between regional grid nodes and local grid stations.
3. Low-voltage grids 400/230 V: Supply end consumers such as households and small businesses.

Electricity distribution:

Distribution covers all processes from the transfer point in the medium-voltage range to the end consumer:

1. Local grid transformers convert medium voltage into low voltage.
2. Electricity is distributed via cables and lines, sometimes underground (in cities) or via overhead lines (in rural areas).
3. Switchgear and fuse systems ensure protection and control of the grid.

Electricity storage:

Electricity must be generated and consumed in real time. Storage systems help to buffer fluctuations:

1. Battery storage systems (e.g. lithium-ion) store surplus electricity for short periods.
2. Pumped storage power plants are the largest form of mechanical energy storage.
3. Power-to-X technologies convert electricity into hydrogen, synthetic fuels or heat for later indirect use.

Grid monitoring and control:

Grid stability is essential. Grid control centers monitor and control:

1. Frequency (must be constant at 50 Hz)
   Voltage
   Load flows
   Faults, outages, switching operations
2. Modern systems use intelligent automation (smart grid) for this purpose.

Use and areas of application of power supply systems:

1. Households:
Supply of electricity for lighting, consumer electronics, household appliances and increasingly also for heating (e.g. heat pumps) and e-mobility.
Self-supply through PV systems is becoming more widespread, including feeding into the grid.

2. Industry:
Large consumers require electricity for machines, production facilities, processes and automation.
Often have their own substations and medium-voltage connections.
High demands on grid quality (e.g. for sensitive production processes).

3. Trade and services:
Electricity for lighting, IT, cooling systems, cash register systems and office equipment.
Catering, retail, office buildings and hotels require constant security of supply.

4. Infrastructure and public facilities:
Hospitals, public authorities, educational institutions, transportation companies, etc. depend on a reliable power supply.
Often equipped with emergency power supply (e.g. diesel generators, battery systems).

5. Transportation:
Electrification of rail transport (traction current networks).
Charging infrastructure for electric vehicles is becoming an integral part of the power supply structure.
Perspective: bidirectional charging for grid stabilization (vehicle-to-grid).

Developments and challenges in the area of power supply systems:

• Decentralization and prosumer model:
  Consumers are becoming simultaneous producers (e.g. with PV system and storage).
  New requirements for grid planning, feed-back, control.
• Digitalization and smart grid:
  Digitalization allows precise control and automatic load distribution.
  Smart meters and control boxes create the basis for flexible tariffs, load management and grid-friendly behavior.
• Grid integration of renewable energies:
  Fluctuating feed-in from wind and solar poses challenges for the grid.
  Flexibilization and storage are becoming essential, as is load shifting.
• Security of supply:
  Stable power supply despite increasing volatility requires intelligent control, predictive maintenance and emergency concepts.
  Grid bottlenecks and redispatch measures are increasing.

Power supply systems are the backbone of every modern society. They connect producers and consumers via a complex, closely meshed grid. Their task is not only to supply electricity, but also to ensure stability, efficiency and sustainability. With increasing decentralization, electrification and digitalization, the requirements are growing - at the same time, new opportunities are opening up for greater security of supply, economic efficiency and climate protection.

Below you will find an overview of the most important criteria that you should pay attention to when purchasing power supply systems:

When purchasing in the area of power supply systems, there are a number of technical, qualitative and economic factors that must be carefully considered. A well-founded selection is crucial for the operational safety, service life and maintenance-free operation of these systems. Due to the variety of components offered in the field of power supply systems, we will show below examples of what should be considered when purchasing a power generation system.

• Before an offer is requested or a tender is formulated, a precise requirements analysis and target definition is essential:
• Supply objective: will the system be used for self-generation, emergency power supply or for feeding into the grid?
• Operating mode: Is the system to be operated parallel to the grid, off-grid (stand-alone operation) or hybrid?
• Power requirement: What is the continuous power (kW/MW), peak load and redundancy requirement, if applicable?
• Runtime and operating hours: Is a continuous operation solution (e.g. CHP) or a sporadically used system (e.g. diesel emergency generator) required?
• Choosing the right power generation technology is crucial and depends on the location, load profile, fuel availability and strategic goals:
• Diesel/gas engine gensets: ideal for emergency power and medium/long-term operation with high reliability.
• Combined heat and power plants (CHP): Combined power and heat generation - particularly economical with simultaneous heat consumption.
• Photovoltaic systems: For self-generated electricity during the day, usually parallel to the grid, depending on weather and irradiation.
• Wind power plants: Suitable in suitable locations - but more complex in terms of approval and grid management.
• Hydropower, biomass, geothermal energy: For special, long-term projects with more complex approvals.
• Fuel cells, micro gas turbines, Stirling engines: For special applications, small outputs or high efficiency requirements.
• Economic efficiency and total cost of ownership. The pure purchase price is often only a small part of the economic truth.
• Fuel costs: How stable and available is the fuel? Is a long-term supply guaranteed?
• Efficiency: Higher efficiency levels permanently reduce operating costs.
• Maintenance intervals and costs: Frequency of service calls, replacement cycles, wearing parts.
• Subsidies and feed-in tariffs: Are investment grants, tax breaks or feed-in tariffs available?
• Amortization period: How long does it take for the system to pay for itself?
• A life cycle cost analysis (total cost of ownership) should always be part of the investment decision.
• Technical features determine performance, operational reliability and flexibility:
• avoid oversizing: A system that is too large is inefficient and expensive in partial load operation.
• Start-up behavior and dynamics: Important for emergency power applications - can the system start up quickly?
• Grid perturbations and harmonics: Is it necessary to use a synchronous generator or an inverter, for example?
• Voltage, frequency and phase requirements: Does the generated current need to be particularly stable?
• Modularity and scalability: Can the system be expanded at a later date?
• Manufacturers should be certified to VDE, IEC or ISO and components should be manufactured to industry standards.
• Technically suitable systems must also match the site and infrastructure requirements:
• Space requirements: Is the available space sufficient for installation, maintenance, air routing?
• Noise development: Does a noise protection concept need to be planned?
• Exhaust gas routing and air supply: Particularly important for combustion engines.
• Grid connectivity: May require consultation with the grid operator (keyword: feed-in management).
• Safety equipment: Fire protection, access control, earthing, overvoltage protection.
• Last but not least, the building permit situation must also be checked - for example for outdoor units or systems with emissions.
• A qualified provider is essential for long-term operational safety:
• Technical expertise: manufacturer or system integrator with experience in comparable projects.
• Service concept: How is support organized - response time, availability of spare parts, remote maintenance?
• Training and handover: Is the operating personnel comprehensively instructed?
• Reference projects: Has the supplier successfully implemented comparable systems?
• Today, power generation systems must be intelligently integrated into the overall system:
• Energy management systems: Connection for load control, visualization and data analysis.
• Automatic control: start/stop on demand, load-following operation, transition to emergency power supply.
• Communication interfaces: Support for protocols such as Modbus, BACnet, CAN, Ethernet.
• Compatibility with storage solutions: Combination with battery storage systems for higher self-consumption rates or peak load management.
• Forward-looking planning of these interfaces facilitates subsequent expansions and creates transparency in energy use.
• A professional purchasing department must be familiar with and comply with legal, normative and safety requirements:
• Grid connection regulations: VDE-AR-N 4105 (low voltage), VDE-AR-N 4110 (medium voltage) etc.
• Ordinance on Industrial Safety and Health (BetrSichV): Inspection obligations, operator responsibility.
• Emission protection: TA Luft, noise guidelines, approval according to BImSchG if necessary.
• Approvals and certificates: CE marking, equipment safety certificates, declarations of conformity.
• Insurance and liability: Are risks covered by insurance or a maintenance contract?

When purchasing power supply systems, it is not just a question of technical key figures, but of a holistic understanding of requirements, technology, cost-effectiveness and integration. Only those who pay consistent attention to these aspects will make a sustainable, safe and economically sensible decision. Good planning, realistic operational analysis and partnership-based cooperation with an experienced provider are crucial for success.

Power supply systems can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Power supply systems from all over the world can be found on Exportpages.