Medium and high voltage frequency converter

Power range: 220KW-6MW

[Voltage level: 3KV, 6KV, 10KV]

Product Overview

The ACI-H series high-voltage frequency converter designed and manufactured by Guangzhou Zhufeng Electric Co., Ltd. is an AC-DC-AC voltage type frequency converter that combines excellent performance, price comparison, and high-voltage reliability. The main circuit adopts a multi-level topology circuit, and the control method adopts sine wave pulse width modulation. The input adopts transformer isolation multiplexing technology, and the output adopts a direct high-voltage method of multi unit phase-shifting series connection.

Based on the motor control technology foundation accumulated by the company and its employees for many years, the output and input harmonic content of the product have reached the leading level in China. The output voltage waveform is close to sine, ensuring the stability of the motor operation within the entire speed range. The low content of input current harmonics causes almost no pollution to the power grid, ensuring the reliability of the operation of other surrounding electrical appliances.

This series of frequency conversion equipment can drive high-voltage motors for stepless speed regulation in almost various application places, and its smooth speed regulation, high efficiency, and high power factor are favored. Especially in today's increasingly scarce market, the economic benefits brought by the ACI-H series applied to energy-saving operation of fans and pumps are extraordinary.

This series of frequency converters consists of three main parts: the transformer cabinet on the left end of the machine, the power unit cabinet in the middle, and the control cabinet on the right end. To improve the stability of the control circuit and facilitate debugging and use, the control cabinet door is opened on the right side of the machine. The product adopts a cabinet structure with forced purchase and sale price difference, and the large capacity models adopt an air-cooled closed cycle heat dissipation method.

The input and output wiring of the entire machine are located in the lower left corner of the cabinet, making wiring convenient.

ACI-HHigh voltage series products

ACI-H3 3kv 315kw~1250kw

ACI-H6 6kv 315kw~5000kw

ACI-H10 10kv 315kw~8000kw

Application industry:

1.Thermal power generation: induced draft fan, supply fan, dust cleaning fan, compressor, feedwater pump, ash pump, etc;

2.Metallurgical mining: induced draft fan, ventilation fan, dust cleaning fan, mud pump, descaling pump, centrifugal feed pump, etc;

3.Petrochemical industry: induced draft fan, gas compressor, water injection pump, submersible pump, boiler feed pump, main pipeline pump, brine pump, mixer, extruder, etc;

4.Cement industry: kiln induced draft fan, raw material grinding induced draft fan, pressure supply fan, main suction fan, cooler suction fan, cooler exhaust fan, sorter fan, kiln air supply fan, etc;

5.Other: Transmission machinery, wind turbines, wind tunnels, etc.

Technical features:

1.Modular electronic building block design, power unit cascaded high-voltage inverter;

2.Adopting multiple rectification technology, with low harmonics and high power factor, it meets the strictest requirements for power quality management;

3.Adopting multiple inverter technology, the output harmonics are small, the motor torque ripple is small, and the operating efficiency is high;

4.Using DSP and CPLD control platform, the real-time and reliability of system control are extremely high;

5.Built in PID regulator and programmable terminal setting function, facilitating transformation control to meet process control requirements;

6.Touch screen, program running, analog potentiometer, voltage source, current source, communication interface and other control command input channels, with flexible and convenient control methods;

7.AVRFunctional design: In case of significant voltage fluctuations in the power grid, the output voltage can remain relatively unchanged, making it suitable for the Chinese power grid;

8.Complete protection function: It can reliably protect against faults such as short circuit, overcurrent, overload, phase loss, three-phase imbalance, and overheating of rectifier transformers in high-voltage frequency converters;

9.Multiple bypass design: It can bypass the power unit when the system is live, and the frequency conversion system can continue to operate.

Energy saving principle of medium and high voltage speed control

The load characteristics of blade type fans, water pumps, and compressors are square torque type, which means that the torque required to be provided on the shaft is proportional to the square of the rotational speed. Under the conditions of geometric similarity, motion similarity, and power similarity, fans and pumps follow the law of similarity. For the same fan (or pump), when the density of the axial fluid remains unchanged and only the speed changes, the changes in its performance parameters follow the law of proportionality, that is, the flow rate is proportional to the first power of the speed, the head (head) is proportional to the second power of the speed, and the shaft power is proportional to the third power of the speed. However, in practical applications, due to the limitations of system parameters and operating conditions, the proportional law cannot be simply applied to calculate the speed range and energy-saving effect. Instead, the proportional law can only be used for calculation after converting the actual operating conditions to similar projects.