All categories
Featured selections
Trade Assurance
Buyer Central
Help Center
Get the app
Become a supplier
(1696 products available)
A 500kw frequency converter is available in several types. Each of these runs on a different operational principle.
AC to AC Frequency Converter
These converters modulate an existing AC power supply's frequency to adjust the output frequency. This way, it can be used to power equipment requiring a different frequency. Such equipment includes small power tools, laboratory instruments, and audio equipment. It is quite portable and primarily used for low-power applications where only a small amount of power is needed. The operational efficiency of these converters is above 90%. These also have a simple design that makes maintenance and operation easy. However, these devices can also be quite costly.
Static Frequency Converter (SFC)
These converters use semiconductor devices to convert the input power frequency to the desired output frequency. They then rectify the incoming AC power to DC. After this, they invert the DC power back to AC at the required frequency. These can be used in various industries to drive AC motor frequencies. They are great for acclimatizing older tools and machines. These devices have an efficiency of 95% to 97%. They are also quite compact and have a long service life. Still, they have a high initial cost and can be sensitive to power supply variations.
Diesel Frequency Converter
Switching between AC and DC, these converters generate electric power using the heat produced by a diesel engine. The engine runs a controlled speed alternator thus maintaining constant frequency. These converters are crucial where AC power generation is required. This includes mining, offshore industries, and military applications. These converters are highly reliable and can be deployed in remote areas where there is no access to the grid. Diesel frequency converters offer independence from utility power and are ideal for backup power in case of utility failure. However, they can be quite inefficient especially during part load and their fuel cost in comparison to other generators is quite high.
Mechanical Frequency Converter
These converters utilize mechanical components such as gears or flywheels to convert the power frequency. Most times, the power source will be either a steam, gas, or water turbine. These converters are used in industries requiring large power, like mining and oil and gas. They are also useful in remote areas without access to electrical grids. These converters can transmit large amounts of power and are quite durable under heavy loads. Still, modern mechanical converters are not very common due to their high maintenance requirements. They are also not very efficient and possess low power density.
Power Grid Interconnection
One of the main duties of frequency changers is to help people interconnect power grids that operate at varying frequencies. For instance, American grids work at 60 Hz while those in Europe work at 50 Hz. Frequency changers facilitate the seamless exchange of electricity by synchronizing frequency, voltage, and phase. This then helps increase energy security and reliability by keeping interconnected grids capable of supporting power exchange. This helps stabilize any fluctuations in grid frequencies. This also gives the grid the ability to absorb excess energy from renewable sources, which then helps reduce congestion.
Aircraft Power Systems
Many aerospace and ground support equipment are designed to operate on 400 Hz power. This is mainly because the high frequency allows them to use smaller, lighter components. However, most commercial power systems operate at 50 or 60 Hz. Thus, frequency changers are used to power these systems using the available lower frequency. They then efficiently convert 50 or 60 Hz to 400 Hz to support vital operations. This makes them indispensable equipment on airport ramps and in military aviation.
Renewable Energy Integration
In recent years, frequency converters have increasingly been used to help integrate renewable energy sources into existing power systems. This is particularly because most of the renewable sources like wind and solar are produced using DC. These converters allow the output of renewable generation systems to be synthesized to match the AC power system frequency. This would then help integrate a variety of renewable sources, which then improves the flexibility of the grid. This further enhances the capacity of people to integrate their preferred renewable energy sources and helps reduce the reliance on fossil fuels.
Industrial Equipment
Most industrial tools work best with their optimal frequency. Many of these tools include electric motors, pumps, and compressors that require constant speed to function optimally. This is particularly the case in manufacturing, mining, and oil and gas industries. In these industries, 500kw frequency converters are used to power their machines even if their power systems operate at lower frequencies. This helps minimize mechanical stress and improve operating efficiency.
Ship and Submarine Power Systems
Ships and submarines used in the naval fleet operate their electrical systems at 60 Hz. They do this as a way to maintain power consistency in all their systems. Unfortunately, shore facilities mostly operate at 50 Hz. This makes it necessary to use frequency converters to enable ships and submarines to get the electrical power they need while docked at ports. Thus, a frequency converter provides the required 60 Hz power from the 50 or 60 Hz power system.
Phase-Synchronized
The device's phase synchronizing ability allows it to meet output voltage and frequency variations as well as output waveform phases. This, in turn, makes the output voltage and frequency stable and high-quality. Such high-quality outputs are essential for sensitive electrical equipment. Note that the synchronization degree is normally set to within ±5° of the phase difference.
C Black Preservation
It's important to use black-keeping technology when there are sudden large loads or short circuits in the connected power grid. This is primarily to prevent the frequency converter from going through an abnormal shutdown. The well-known black-keeping methods include frequency-holding and voltage-holding. The holding factors' values are determined by the converter's various parameters and users' requirements.
Reactive Power Compensation
A frequency converter can automatically adjust the output reactive power and internal power factor according to the load. This internal power factor plays a major role in the energy-saving efficiency of electrical devices. The parameter can be set in the converter's software. They can then be automatically compensated with a change in the load or external circuit to keep the internal power factor unchanged.
Multiple Operational Modes
This powerful electronic converter features many operational modes. Wide area mode, for example, has the converter operating under the controller's command. This means the controller will determine the frequency output value while the converter will adjust to follow the command. Other modes include constant pressure, constant speed, and emergency mode. These modes ensure the frequency converter will always operate efficiently no matter the situation.
Intelligent Control
The intelligent control system enables automatic frequency and amplitude adjustment depending on load conditions. This ensures steady and high-quality output voltage even amid fluctuating input voltages. Other than the automatic operations, users can manually adjust the control and operational parameters through the frequency converter's smart controller.
Static converters
There are many frequency changers out there, and one has to settle for the right one. Of the electrical static frequency converters available, the rotary converged has higher power but the static frequency converters are the best on the market.
Accuracy required
People should evaluate the tools they intend to use first. This is because some require high accuracy to avoid damaging the equipment. For instance, airplanes. Others like refrigerators don't need that much accuracy as they come with their equipment that can buffer minor inaccuracies.
Power capacity
A frequency converter's power capacity has to match that of the working load. If it goes over, then the converter will experience a power waste. At the other end of the spectrum, if it is too low, it will not have sufficient power to carry out the tasks. Manufacturers usually provide the maximum and minimum power capacity of their converters. It is better to use industrials frequency converters with larger power ranges.
Environment
A frequency converter can either be installed indoors or outdoors. Knowing where to install them ensures the proper one is purchased. This is because outdoor ones have to withstand different weather conditions. Their design also has to be more robust than that of the indoor ones.
Input and output voltage
These two voltage characteristics have to be taken into consideration. They should be as per the requirements of the equipment. Something that can easily be done by using a step-up or step-down transformer, which adjusts the voltages appropriately. It's also crucial that the external voltage source is checked so that its voltage doesn't exceed that of the internal components. Doing this will help avoid damage from high voltage.
Regularly inspect and clean the internal components to violence the buildup of dust and debris. Monitor operating parameters such as voltage, frequency, and current to help detect anomalies early on. Check for signs of wear or damage on parts like capacitors, bearings, and filters, and replace them as necessary. Also, ensure the firmware and software related to the converter system are updated. This improves performance and secures any vulnerabilities.
Yes, the input and output frequency mostly affects its efficiency. Ideally, the closer the input and output frequencies are to each other, the more efficient the converter will be. This is particularly so if the input frequency fluctuates a lot since the converter will have to use extra resources to stabilize the output. If it hardly fluctuates at all, then resource usage will be low. The good thing is that there are converters designed to efficiently handle fluctuating input frequencies.
Filters are crucial in large frequency converters. One, they help minimize the fluctuation that may be present in the output voltage. They are also responsible for reducing electromagnetic interference. Without them, the converter will create radio frequency noise that can interfere with nearby electrical devices. Also, it can help stabilize the output voltage and current, ensuring a smoother and more stable power supply.
The first is digital signal processor (DSP) technology, which has improved the converter's processing speed. This allows for greater precision in control that leads to better output stability. The second is the development of compact power electronic devices like IGBTs. They help achieve high performance while consuming less space. Lastly, high-frequency transformers offer improved energy transfer efficiency and miniaturization of the system.
Overvoltage protection helps shut the generator down when the voltage exceeds a manufacturer-specified value. There is also overheating protection, where the generator will shut down if the temperature exceeds a particular value. The same goes for overcurrent protection, which helps shield the generator from damages when there is excessive current. Finally, there are short-circuit protections that disconnect the load from the generator as soon as a short circuit is detected.
