Transformer capacity is greater than the inverter ten times or more than the transformer capacity is greater than 600KVA or more need to install the line reactor; DC reactor to improve the power factor; outlet reactor to protect the motor and inverter (outlet too long) to reduce interference. Reactors used in the inverter there are 3 kinds: into the line reactor, outlet reactor, DC reactor. 1, the main role of line reactor is to suppress the incoming line power harmonics, increase the main circuit into the line power short-circuit impedance. Use it accordingly. 2, outlet reactor The main role is to balance the distribution of capacitive cable outlet load, increase the outlet of the main circuit short-circuit impedance. And can inhibit the harmonics of the inverter output, play a role in reducing the noise of the inverter. When more than two inverters are operated in parallel, they also function to limit the commutation circulation and load balance. The former to consider the length of the cable to determine whether to use, the latter must be used. 3, DC reactor is mainly used for the public DC bus type AC - DC - AC variable frequency drive system. It must be used if the current mathematical model of the commutator is inductive and may not be used if it is a capacitive load. In any case, the use of DC reactor can play a role in suppressing DC current fluctuations. Its function and effect are as follows: Reduce main power harmonics, surge and peak current; Improve low frequency conduction immunity; Protection of drive power electronic components; Improve power factor Prevent tripping due to voltage spikes on the main power supply Industrial energy consumption situation is still grim Industrial energy saving is imminent During the 11th Five-Year Plan, 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 73.9% of the total energy consumption of the whole society from 70.9% , The share of energy consumption in the total energy consumption of the six major energy-intensive industries such as steel, non-ferrous metals, building materials, petrochemicals, chemicals and electricity rose from 71.3% in 2005 to about 77% in 2010. Internationally, the green trade barriers in developed countries have put tremendous pressure on China's manufacturing exports. Policy to promote the development of industrial energy-saving industries The overall goal of industrial energy saving during the 12th Five-Year Plan period: By 2015, the energy consumption of industrial added value above designated size will drop by 21% over 2010 and the estimated energy saving will reach 670 million tons of standard coal during the "12th Five-Year Plan" period. The energy consumption of industrial added value of key industries such as steel, non-ferrous metal, petrochemical, chemical, building materials, machinery , light industry, textile and electronic information dropped 18%, 18%, 18%, 20%, 20%, 22 %, 20%, 20%, 18%. Energy-saving policies to promote the development of energy-saving industries. Inverter energy-saving effect is remarkable At present, 66% of the total power generation in China is consumed by the motor, while the inverter can save energy by up to 30%. When the energy price goes up, the energy-saving benefit of the enterprise is more obvious. The driving factors of high-voltage inverter and medium-low voltage inverter are different. The high-voltage inverter saves energy and has remarkable effect. Under the guidance of national energy-saving and emission-reduction policies, the driving factors are high-speed growth. Low- and medium-voltage inverter is mainly used to improve the running performance of the motor. The future high-voltage inverter will be rapid development, low-voltage inverter will accelerate the import substitution. Grid construction, wind power solar power projects to promote reactive power compensation industry growth In recent years, with the promotion of national policies, China's wind power and photovoltaic power generation have been developing rapidly. However, the voltage instability characteristic threatens the safety and reactive power compensation of the power grid and is the core of improving the power transmission quality. In the 12th Five-Year Plan of Energy, it is proposed to accelerate the development of wind energy solar power generation projects, promote the construction of smart grids, and speed up the implementation of a new round of rural power grid upgrading and upgrading projects, which will further promote the development of reactive power compensation. EMC mode to help the development of waste heat power generation Waste heat and pressure utilization in the 12th Five-Year Plan for Industrial Energy Conservation as a key energy-saving project, planning to generate additional waste heat 20 million kilowatts. Waste heat in the high energy-consuming industries more than pressure for the use of cement, glass, steel and other industries. After more than 10 years of development, research and actual operation experience, the technology of pure low temperature waste heat power generation in China has achieved the international advanced level in the level of technology and equipment. It has obvious competitive advantages in the international market and has pioneered the international market. In the construction of waste heat power generation projects, EMC mode EPC package than the higher profits, more stable cash flow, the future energy-saving company will focus on the development direction. Transformer capacity is greater than the inverter ten times or more than the transformer capacity is greater than 600KVA or more need to install the line reactor; DC reactor to improve the power factor; outlet reactor to protect the motor and inverter (outlet too long) to reduce interference.
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