product description:
It is a new type of power harmonic control equipment developed in parallel mode (current type) through modern power electronics technology and digital signal processing technology based on high-speed DSP devices.
By monitoring the load current in real time, the analog current signal is converted into a digital signal through a high-precision and high-performance A/D, and then sent to a high-speed digital signal processor (DSP) to process the digital signal to separate the harmonics in the load current and form The command signal is sent to the converter (compensation current generating circuit) in the form of a pulse width modulation (PWM) signal. The converter absorbs the forward harmonic current and charges the absorbed energy to the DC side high-voltage capacitor. This part of the energy is then emitted into a waveform with an opposite phase to the negative harmonics to offset the negative harmonics.
Technical features:
● Real-time following and dynamic compensation
It adopts harmonic current detection technology based on instantaneous reactive power theory to detect harmonic current in real time; through instantaneous current tracking control, it can realize dynamic compensation of harmonic current and automatically track the harmonic changes of the power grid, which is highly controllable and fast responsive.
● Flexible compensation methods
One machine has multiple functions. It can not only control harmonics, but also compensate reactive power and improve power factor. It can independently compensate a single harmonic source or collectively compensate multiple harmonic sources. It can also achieve harmonic control. Designate harmonics for treatment; can be used as a harmonic source.
● DSP intelligent monitoring
DSP high-speed detection and calculation ensures accurate and effective harmonic detection and compensation control; it also has intelligent monitoring functions, flexible device control, and clear operating parameters and working status; automatic fault diagnosis; with remote communication interface, real-time monitoring through PC.
●Advanced power conversion design
It adopts the latest IGBT high-frequency switching device, and the main circuit topology is a three-phase bridge type fully controlled PWM converter, which has the characteristics of small size, high efficiency and high reliability. Advanced multiplexing technology enables expansion of the overall machine capacity.
●Standard modular design
The power circuit and control circuit adopt a modular structure, which improves reliability and maintainability in use while achieving standardized production.
Suggested applications for active filters:
● If the harmonics are serious (>50%), only tuned passive filters or active filters can be used to control harmonics.
● The background harmonics are large, and the tuned filter is in danger of resonance or overload.
● If the power factor is high, the tuned filter will overcompensate, and the automatic switching device for reactive power compensation cannot be put into use, such as a frequency converter.
● High-order harmonics are serious and require high filtering effect.
● A new harmonic source needs to be installed and the capacity needs to be expanded.
● Neutral line harmonic elimination (3rd harmonic)—4-wire active filter
● Fast phase-separated reactive power compensation, thyristor switching speed cannot meet the requirements
Technical Parameters:
Technical Parameters |
Operating Voltage | 380V/690V ±20% 50/60Hz |
Compensation current | 25A~300A |
filter effect | THDI＜5% |
Response time | All or selected harmonics from 2 to 60 times |
Overload protection | <20ms |
On-off level | Output current is limited to 100% |
Display operation interface | 20KHz |
indicator light | Multi-line Chinese character interface |
Signal output | Operation, alarm, failure |
Remote monitoring | Relay output |
Installation method | RS485 |
Operating environment temperature | Single machine operation or no more than 10 units in parallel operation |
storage temperature | 0~40℃ |
Relative humidity | -40℃~65℃ |
Altitude | <1000m |
Protection level | IP20 (or according to customer needs) |