Function and classification of three kinds of reactors used in inverter

Crystal oscillator

Photocoupler

If the transformer capacity is more than ten times that of the inverter or the transformer capacity is greater than 600KVA, the line reactor should be installed; the DC reactor is used to improve the power factor; the line reactor is used to protect the motor and the inverter (excessive line length) to reduce interference.

There are three types of reactors used in inverters: line reactors, line reactors, and DC reactors.

1. The main function of the incoming line reactor is to suppress the grid side harmonics of the incoming line power supply and increase the short circuit impedance of the main line of the incoming line power supply. According to this, it is flexible to consider whether to use it.

2. The main function of the outgoing reactor is to balance the distributed capacitive load of the outgoing cable and increase the short-circuit impedance of the main loop of the outgoing line. It can suppress the harmonics of the inverter output and reduce the noise of the inverter. When two or more inverters are operated in parallel, it also plays a role in limiting the commutation loop and load balance. The former considers the length of the cable to determine whether to use it, and the latter must use it.

3. The DC reactor is mainly used in the AC-DC-type AC-DC-AC variable frequency drive system. If the current mathematical model of the common rectifier is an inductive load, it must be used; if it is a capacitive load, it can be used. In either case, the use of a DC reactor can suppress DC current fluctuations.

Its function and function are as follows:

Reduce mains harmonics, surges and peak currents;

Improve low frequency conduction anti-interference;

Protecting the power electronic components of the drive mechanism;

Increase the power factor;

Prevent tripping caused by voltage spikes of the mains

Industrial energy consumption situation is still severe, industrial energy conservation is imminent

During the "Eleventh Five-Year Plan" period, the total industrial energy consumption increased year by year, from 1.595 billion tons of standard coal in 2005 to 2.4 billion tons of standard coal in 2010, accounting for 70% of total social energy consumption from 73.9% to 73%. Around the top, the energy consumption of the six high-energy-consuming industries of steel, non-ferrous metals, building materials, petrochemicals, chemicals and electricity accounted for 71.3% of total energy consumption in 2005 and about 77% in 2010. Internationally, the green trade barriers of developed countries have put tremendous pressure on China's manufacturing exports.

Policy promotes the development of industrial energy conservation industry

The overall goal of the 12th Five-Year Plan for Industrial Energy Conservation is that by 2015, the energy consumption of industrial added value above designated size will be reduced by about 21% compared with 2010, and the estimated energy saving of 670 million tons of standard coal will be realized during the 12th Five-Year Plan period. The industrial added value energy consumption of key industries such as steel, non-ferrous metals, petrochemicals, chemicals, building materials, machinery, light industry, textiles and electronic information decreased by 18%, 18%, 18%, 20%, 20%, 22 respectively compared with 2010. %, 20%, 20%, 18%. Energy conservation policies promote the development of energy conservation industries.

Frequency converter energy saving effect is remarkable

At present, 66% of China's total power generation is consumed on the motor, and the power-saving efficiency of the inverter is increased by 30%. In the case of higher energy prices, the energy-saving benefits of enterprises are more obvious. The high-voltage frequency converter is different from the driving factors of medium and low-voltage frequency conversion. The high-voltage frequency conversion energy-saving effect is remarkable. It is under the guidance of the national energy-saving emission reduction policy, and the medium-low voltage frequency converter is mainly to improve the motor running performance, and the growth rate is driven by the downstream industry. In the future, high-voltage frequency conversion will develop at a high speed, and low-voltage frequency conversion will accelerate import substitution.

Power grid construction, wind energy solar power projects promote the growth of reactive power compensation industry

In recent years, driven by national policies, China's wind power and photovoltaic power generation have developed rapidly, but its voltage instability characteristics threaten the safety of power grids. Reactive power compensation is the core to improve its transmission quality. In the 12th Five-Year Plan for Energy, it is proposed to accelerate the development of wind energy solar power projects, promote the construction of smart grids, and accelerate the implementation of a new round of rural power grid reconstruction and upgrading projects will further promote the development of reactive power compensation.

EMC mode helps the development of waste heat power generation

The use of residual heat and residual pressure is regarded as a key energy-saving project in the 12th Five-Year Plan for Industrial Energy Conservation, and plans to add 20 million kilowatts of waste heat power. In the high energy-consuming industries, the residual heat and residual pressure is better used in cement, glass, steel and other industries. After more than ten years of development, research and practical operation experience, China's pure low-temperature waste heat power generation technology ranks first in the international market and has obvious competitive advantages in the international market. It has opened up the international market. In the construction of waste heat power generation projects, the EMC model has higher profits and more stable cash flow than the EPC general contracting project, which will be the key development direction of future energy-saving companies. If the transformer capacity is more than ten times that of the inverter or the transformer capacity is greater than 600KVA, the line reactor should be installed; the DC reactor is used to improve the power factor; the line reactor is used to protect the motor and the inverter (excessive line length) to reduce interference.

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