In modern mining gravity traction, transportation, metal smelting, chemical electrolysis, and metal electroplating industries, direct current energy is widely converted into mechanical energy, thermal energy, and chemical energy. In the above energy conversion process, the first step is to convert the alternating current energy in the power system into direct current energy, which is accomplished by the converter device; Then, the DC power supply line transfers the DC electrical energy to the power terminals. Therefore, the DC power supply network is composed of a converter device and DC power supply lines.
There are various types of high-power converter devices, mainly including DC generator sets, converters, mercury rectifier sets, silicon rectifier sets, etc. Among them, high-power silicon rectifier units have the highest efficiency. DC power supply lines mainly include DC feeders and traction networks for traction loads; For loads such as smelting, electrolysis, and electroplating, it mainly refers to DC conductive bars.
The direct current power supply accounts for more than 5% of the total electricity consumption. Therefore, the economic operation of DC power supply is also an important link for enterprises to reduce line loss rate and save electricity. GB3485 provides three principle provisions for the rationalization of DC power supply networks: "1:10 enterprises should adopt high-efficiency rectification devices (the efficiency of rectification devices includes ancillary equipment). The efficiency of rectification devices should meet the following indicators: a. When the power of rectification devices is above 1000kW, it should be above 95%; b. The power of the rectifier device should be above 90% below 1000kW. The location of the 1.11 rectifier station should be close to the load, and the operation mode of the DC power supply network should be reasonable, shortening the power supply radius, reducing contact resistance and voltage drop, and reducing line loss rate. 1.12 The rectifier device should use transformer on load voltage regulation instead of inductive voltage regulation to improve rectification efficiency and natural power factor.
There is a nonlinear functional relationship between the power loss and load characteristics of high-power silicon rectifier units during the transformation and conversion process. It is similar to transformers and has an economic load factor. Due to the differences in technical characteristics between each silicon rectifier unit, there are also economic operating modes. That is to say, under the same load conditions, by selecting rectifier units with good technical characteristics and economical operation modes, the loss rate of silicon rectifier units can be minimized.
High power silicon rectifier unit is a major transformer and converter device that converts AC electrical energy into DC electrical energy in the power system.
High power silicon rectifier equipment is composed of rectifier transformers (including voltage regulators), silicon rectifiers, and their ancillary equipment.
Due to the fact that silicon rectifier transformers and silicon rectifiers are complementary equipment, the economic operation of silicon rectifier transformers cannot be considered separately, and the economic operation of silicon rectifier units must be considered as a whole
