Generator with multiple power generation units and operation control method of generator

Abstract

The invention relates to the field of power generating devices for generating power by using external kinetic energy. The invention provides a generator composed of a plurality of independently operable power generating units, and the generator comprises a motor case and a main power shaft; a plurality of power generating units which are sequentially connected in series on the main power shaft, wherein each of the power generating units includes a unit magnet portion as a rotor and a unit coil portion as a stator; a controller and a signal acquisition and transmission module, wherein the controller controls the number of unit coil portions connected by an output circuit so as to control the number of power generating units participating in power generation. The generator can control different numbers of power generating units to participate in power generation according to the change and size of the external power input, so that the generator can generate power normally when inputtingexternal power of different application sections and inputting different external power, which greatly improves the utilization rate of the external power.

Description

technical field [0001] The invention relates to the field of power generating devices using external kinetic energy to generate power, in particular to a generator with multiple power generating units and an operation control method thereof. Background technique [0002] With the development of industrial and agricultural production and the improvement of people's living standards, the technology of using renewable energy for power generation has received more and more attention. The commonly used generators are fixed-value generators, which usually input rated working torque and rated working speed, and the generator outputs rated working voltage, rated frequency and rated power. The above-mentioned constant-value generators have relatively high requirements on input torque and rotational speed, so there are obvious problems in using renewable energy for power generation. [0003] Common renewable energy sources include wind power, tides, etc. The power input provided by t...

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Problems solved by technology

[0003] Common renewable energy sources include wind power, tides, etc. The power input provided by these energy sources is unstable. The wind energy used by existing wind turbines is usually limited to a certain application segment, and the power input outside the application segment Cannot be used effectively, resulting in low utilization rate of renewable energy

For example, the existing large-scale wind power generators are usually composed of a high-power power generation module with a rated power of about 1000KW. Usually, only when the wind power reaches level 5, level 6 and above, can it normally generate electricity and output in accordance with Standard current, but in the low wind and light wind sections of the second to fourth grades, the external power input and power input are usually not enough to drive the generator to generate electricity normally. Even if it generates electricity, the output is waste electricity that does not meet certain frequency and voltage standards, so The generator is in a long-term shutdown and idle state under low wind speed conditions, so the use of wind power by this type of large-scale wind turbine is only limited to a large wind segment with a small application range, and the low wind segment that exists for a long time The wind energy cannot be utilized, so the conversion rate of the whole motor to energy is low, the output input is relatively low, and the waste is large

Of course, there are also a large number of low-power generators on the market, such as small wind turbines of about 500W, which can be flexibly applied to various places and make full use of the low wind and breeze resources there, but they are obviously not suitable for wind power. When encountering strong winds, the generators tend to run too fast or even burn out, so small generators have to yaw or shut down when encountering strong winds, and cannot make full use of the wind energy of relatively strong winds, and they can only be used for specific Smaller load power supply, can not realize commercial power supply or grid-connected power supply in the true sense

[0004] Aiming at the problem of wind instability, AC excitation variable-speed constant-frequency generators appear on the market. The generator speeds up the motor running below the rated wind speed through the gearbox to achieve normal power generation. The problem of increasing the speed to the rated speed, but in the case of low wind speed and small external power input, the external power still cannot drive the motor to work normally

[0005] It can be seen that due to the single and constant rated power of existing generators, it cannot adjust its internal structure and rated power to participate in power generation according to the real-time changes of external input power, so two phenomena often occur; either the external power is not enough Drive the generator to generate electricity normally, or the generator is forced to yaw or stop due to overspeed operation

In fact, there are differences in the natural conditions of wind fields and tides in various regions, and in most cases, they are in a state of low wind speed, occasional large and sometimes small instability. It is adjusted to adapt to the size of the external wind force, so the utilization of wind energy by the existing wind generator is extremely low. According to preliminary estimates, the cost recovery time of an existing large wind generator with a rated power of 1200KW is 12 years, which shows that Low comprehensive operating efficiency

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