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1 硌 硌 蹄 陛姊 陛姊 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05 05. This causes the generator 102 to drop in excitation voltage, creating a large shock current between the armature windings of the two generators. The voltage of the final voltage 1 is reduced, and the system is in an extremely stable state. Although the AC voltage equalization line can solve the parallel operation of different capacity generators, the given generators are the current superimposed phase excitation system and the AC side electricity. It can be cold like a DC side sample. Other bamboos are not satisfied, so the exchange and the ten-line method are not suitable.
Stator winding output voltage equalization method, automatic voltage corrector method are all designed for the same type of generator with the same capacity, obviously can not solve the above two sets of generators and reactive power distribution asked.
2 solutions to solve the problem for the excitation voltage of the above generator excitation current unequal special input, we can find the excitation voltage of the wide generator is 10 2 machine tune machine excitation is 65. If the flower excitation machine rectification as its adjustment With the automatic adjustment of the excitation current of the generator to achieve the purpose of voltage stability and reactive power distribution, the principles are independent. When the generators are running in parallel, 1 generator, 1 card is compared, adjusted, and the varistor is measured. The two points are equal to 10, and it closes when the phase condition is satisfied. Since =, no current flows in the pressure equalizing line at the instant of closing, so the excitation characteristics of each generator are not changed, which ensures the stability of the system electrical parameters.
During the operation. If there is a change in the operating conditions of the inverter, the reactive output will change. E.g. 1 The trend of the voltage drop of the machine has a drop in reactive power and then 1 decreases. The original balance of the excitation system voltage is broken. The team produces a current in the meander line and the current will be generated on the basis of 1 machine original excitation current. Just add current to Shanjiayuan. To illustrate, the trend of increasing the output voltage is actually the increase of the reactive output power, but for the second machine, it is equivalent to the reduction of the excitation current, thereby reducing its reactive output. The process goes until 4; the purpose of the assignment.
3 Analysis and evaluation of parallel operation results Based on the analysis results from the previous analysis, we calculated the design, installation, and commissioning of the control circuit and all electrical parameters of the main switchboard and put it into operation. From the operating conditions, we achieved the expected results.
In the allowable ± 5 voltage deviation range and frequency deviation within the parallel and the success rate is like 1.
Under sudden load reduction and decoupling conditions, the electrical parameters remained stable.
Reactive power transfer and distribution can be realized.
The system can maintain continuous and stable operation.
For comparison. We carried out the generator and turned it off under the condition of disconnecting the pressure equalizing device. After the unit is switched on, the grid is in a state of serious instability, the voltage fluctuates between 300 and 450, and the frequency oscillates over a wide range. Eventually, the following phenomena occur. The system stabilizes under certain conditions, but the voltage drops significantly. 300, and in which the power factor of the generator is capacitive.
The system may experience out-of-step protection device action during the oscillation. The failure of the parallel process.
The generator that becomes capacitive is demagnetized and cannot be pressurized.
Therefore, through the given method, the parallel operation of generators with different capacity and different excitation voltages that can not be solved by other methods can be well handled, which has great practical significance.
Received 200105
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