1. Is a wind power converter a frequency converter?
A wind power converter is a converter used in wind turbines. There are many converters and frequency converters. People may get confused, so is a wind power converter an inverter?
1. What is a frequency converter
A frequency converter is an AC motor power control device that uses frequency conversion technology and microelectronics technology. The main frequency of the frequency converter changes , generally the voltage also changes with the change of frequency, and the current also changes with the change of load.
2. What is a converter?
A converter changes the working voltage, phase number and other power consumption of the power supply and distribution system or Characteristics of electrical equipment. The converter controls the change of current and is generally used in parallel networks. Like a grid-connected converter for a wind turbine. Due to parallel connection, the output voltage and frequency must be the same as the grid, and the only thing that can change is the current, so this device is called a converter.
It can be seen that wind power converters and frequency converters are different, but frequency converters can also be called converters in a broad sense.
2. What is the difference between wind power converters and frequency converters
Compared with frequency converters, the hardware of wind power converters is basically the same, and the main difference lies in the control algorithm and manipulation Purpose, the converter changes the current (there is also a chance of changing the frequency), and the frequency converter changes the main frequency.
The reason why converters and frequency converters are called different is mainly due to the different characteristics of the objects they serve. The target of the converter servo is the doubly-fed generator, and the frequency converter is mainly used to regulate the asynchronous motor.
1. The fundamental function of the converter is to adopt certain control methods to allow the doubly-fed engine to emit alternating current that is completely consistent with the power grid. The principle is as follows: the converter injects a certain low-frequency alternating current into the rotor of the doubly-fed generator to generate a rotating electromagnetic field; and requires that the speed of this electromagnetic field plus the mechanical speed on the generator shaft equals the synchronous speed (such as a 4-pole The synchronous speed of the dual-space engine is 1500r/min), so that the electromagnetic field on the rotor cuts the stator coil to generate alternating current. The frequency, phase, and voltage of this alternating current are completely consistent with those of the power grid, so the engine can be connected to the grid to generate electricity.
2. The fundamental function of the frequency converter is to provide alternating current with changing frequency to the asynchronous motor, allowing the motor to rotate according to a certain control method and the speed can be adjusted smoothly, thereby saving energy or improving the production process (such as fire Energy-saving transformation of fans and pump loads in power plants; inverters in the textile industryMotive adjustment can make the thin threads spun consistent in diameter, quality, etc.).
Generally speaking, the working environment temperature range of wind power converters is larger than that of ordinary frequency converters, and the reliability is also higher, because wind power generation generally operates unattended 24 hours a day. It also needs to meet high current operation, so the requirements are higher.
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