Brief introduction of variable speed constant frequency generator
Achieve a wide range of reactive power regulation: General variable-speed constant-frequency wind turbines cannot directly meet the requirements of the reactive power regulation grid, even if the full-power inverter, in the event of a grid fault, the wind turbine cannot meet the requirements of low-voltage and reactive power output capabilities. Compared to the main grid generator set. After the construction of large-scale wind farms, the reactive power adjustment range has become a larger constraint index. The new development of direct and variable-speed constant-frequency reactive power adjustment and low-voltage ride-through performance indicators is far higher than the current wind power grid-connected technology standards and is close to the main synchronous generator level of the power grid.
Low harmonic output: The direct-conversion speed-regulating motor adopts a combined harmonic suppression design, so that the harmonic content of the output voltage and current is controlled within the standard range. Low harmonic output is the basic requirement for parallel operation of generators, especially when large-scale wind power is connected to the grid, it cannot solve the harmonic problem and restricts the large-scale development of wind power generation. DC variable frequency speed regulation motor shows great advantages in current harmonic control.
The active power output curve is smooth and adjustable: analysis of straight and variable speed constant frequency, and the unit uses fuzzy control technology and inertial energy storage technology, which can control the instantaneous active power and keep the generator's active power output curve smooth and adjustable. At the same time, it can prevent the unit from overloading caused by turbulence and protect the safe operation of the blades, towers and transmission systems. The generator can also be operated in stages, which helps the grid solve overvoltage problems and greatly improves the long-distance transmission capacity of new energy power.
Save investment costs: analysis of direct and variable-speed constant-frequency, and the unit has lost its due power electronics, so the cost of the generator is significantly reduced compared with other types of variable-speed constant-frequency motors, which is conducive to the industrialization and scale of wind power development of. Due to the new technical route adopted by the direct-speed constant-frequency generator, the safety and economics of the unit are improved, and the generating cost of the unit during the entire life cycle is greatly reduced. As the power of the direct-speed constant-frequency wind turbine increases, its advantages will become more prominent. This unit can well meet the construction needs of large offshore wind farms.
Improve safety and reliability: The direct and variable-speed constant-frequency wind turbines use medium speed and are designed to transmit power. During the growth process, any control device is directly connected to the generator, and the generator will be directly output to the power grid, thereby avoiding The effect of current on the coil is the high-frequency pulse of the inverter, so the reliability is greater than the increase of the inverter, and the downtime can be reduced by more than 20% of the full life cycle.
In the past, in order to obtain economic benefits in wind, water, tidal and solar power generation systems, variable speed generators were required. According to the traditional principle of the generator, when the generator speed changes, the frequency of the output voltage will change with the proportional change. If the variable-speed generator is to be operated in parallel, it must pass through a rectifier and an inverter. The high cost, high cost and high failure rate of high power inverters have affected the application of traditional variable speed generators.
- The diesel engine is working normally, but the generator fails to generate electricity or the voltage is very low. This may be due to the components associated with the generator, such as: the exciter is damaged, and the excitation voltage cannot be supplied. The excitation current is taken in. The rotor's dead center residual magnetism is weakened or declining. It will make the generator unable to generate electricity or the transmission voltage is extremely low. The right to respond is usually: use an appropriate DC voltage and directly connect to the excitation winding according to the polarity Magnetization. Carefully inspect the exciter and the cyclotron rectifier, find abnormal components or windings, and replace them for restoration. The generator's transmission voltage is unstable, and
- Blue smoke, fire reason: It means that the engine is burning oil. There are three types of reasons: first, the piston ring goes opposite, and the oil comes in the cylinder; the second is the oil level of the oil pan of the atmosphere filter, which leads the ring. The height of the groove; Third, the gap between the duct and the valve stem is too poor. Expulsion idea: Adjust the piston ring so that the opening teeth of the ring are staggered 120 degrees or 180 degrees, and the opening teeth of the ring should avoid the piston pin hole and the side pressure is poor. Adjust the height of the oil level of the oil filter of the atmosphere filter below the height of the annular groove; if the clearance between the duct and the valve stem is too poor, replace the component and reduce the clearance. The normal mutual assistance clearance between the two is 0.0
- Before starting, you should check whether the fuel volume of the fuel tank is rich, and there is no oil leakage in each oil pipe and the discussion area; whether the cooling system water is rich, clean and leak-free, and whether the fan belt is tight or not. The internal combustion engine and generator drive parts should be connected and trusted. The wires of the input line are well-insulated, complete and effective in all aspects. After starting, it should run at low speed for 3 to 5 minutes. After the temperature and oil pressure wheel are normal, the initial work can be done. The generator should be no different in the speed increase. Ring, the slip ring and commutator are well brushed, no jumping and sparking phenomenon. After the operation is stable and the frequency and voltage reach the rated value, power can be supplied to the outside.
- In the power generation industry in China, we have been working hard, pursuing the concept of quality and service, and for the sake of customers, the full power generator chooses China and your generator is a professional housekeeper. At present, the diesel generator set maintenance market refers to damage inspection and routine maintenance. Two aspects: after maintenance refers to the failure of the diesel generator, there are problems with various accessories, such as replacing the generator or
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