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1 硌 蹄 油 油 油 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , As a result, the excitation voltage 102 is reduced, and a large impact current is generated between the two generator armature windings. , the final power 1 voltage is reduced, the system is in extreme + steady state AC equalizing line, although it can solve the parallel operation of different capacity generators, but because the generators given are current superimposed phase excitation system and AC side electricity The image is like the DC side. Other bamboos are not satisfied, so the exchange, the ten-line method is also unsuitable.
The stator winding output voltage equalization method and the automatic voltage corrector method are all designed for the same capacity generator of the same type. Obviously, it is impossible to solve the problem of parallel and reactive power distribution of the above two generators.
2 solution to the problem of the above-mentioned generator excitation voltage excitation current unequal, we can find that the excitation voltage of the wide generator is 102 2, the excitation excitation of the machine is 65. If the excitation of the machine is the excitation of the machine as the adjustment With the belt, the excitation turbulence of the generator is automatically adjusted to achieve the purpose of voltage stability and reactive power distribution, and the principle is independent of each other. When the generators are operated in parallel, 1 generator, 1 card comparison, adjustment, 柞 varistor test, two points of electricity make =, and close when the phase condition is met. Since =, there will be no current flowing through the equalizing line during the closing, so the excitation characteristics of each generator are not changed, which ensures the stability of the system electrical parameters.
During the run. If the operating conditions of the station's hair dryer change, the reactive output changes. E.g. 1 machine has a trend of voltage reduction, the output of the reactive power drops, and the voltage balance of the original excitation system is broken. The team, the difference of the enemy seat in the uniform line, produces current, which will be generated in the base 1 of the original excitation current. Just add current to the mountain plus the original. It is explained that the tendency of the output voltage to rise is actually an increase in the reactive output power, but for the two machines, the excitation current is reduced, thereby reducing the reactive output. The process until 4; the purpose of the assignment.
3 Parallel operation result analysis and evaluation According to the conclusions of the previous analysis, we put the main switchboard control circuit and all electrical parameters into calculation, design, installation and debugging, and then put into actual operation. From the operation situation, the expected result was achieved.
In the range of ±5 voltage deviation allowed and the range of frequency difference, the success rate of the vehicle is like 1.
The electrical parameters remain stable under sudden load shedding and disengagement conditions.
It can realize the transfer and distribution of reactive power.
The system can maintain continuous and stable operation.
For comparison. We carried out the generator and the vehicle under the condition of disconnecting the pressure equalizing device, which was discovered during the actual process. After the film machine is closed, the power grid is in a state of severe instability, the voltage fluctuates between 300 and 450, and the frequency oscillates in a large range. Finally, the following phenomena occur. The system reaches stability under certain conditions, but the voltage drops significantly. 300, and the power factor of the generator is capacitive.
The system may have an out-of-step protection device action during oscillation. The failure of the car process.
The generator that becomes capacitive is demagnetized and cannot be pressurized.
Therefore, the parallel operation of the generators with different excitation voltages of different capacities which cannot be solved by other methods can be well handled by the given method, which has great practical significance.
Received date 20015
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