Discussion on the phase-in operation test of generator

The rise of the grid voltage, especially the rise of the terminal voltage, is mainly due to the capacitance rise caused by the line distribution capacitance of the long-distance transmission line caused by the grid parameters. In addition, the load nature at different times can also cause the system's Leica grid voltage to be an important indicator of power quality. Guarantee the delivery of power supply. Take measures, air power, and 1 屯 is within the allowable range. It is an important project of the force system to control the grid voltage, especially the end of the grid. Generally, there are several types of camera sets installed in the power load center, which are mainly used to provide inductive reactive power to meet the system's sensible reactive power. The requirement is to adjust the system voltage to compensate the voltage drop caused by the inductive reactive current. Install a series or parallel reactance on the long-distance transmission line. Male graduated from the Northeast Electric Power College, majoring in power system automation. He is currently the deputy chief engineer of the Heilongjiang Electric Power Research Institute. The senior engineer is the teacher, to compensate the line parameters, absorb the line capacity and reduce the line voltage; the hair unit that is integrated into the system enters the phase. The method of adjusting the excitation absorbs part of the remaining reactive power on the 屯 network and reduces the generator outlet voltage to achieve the purpose of reducing the grid voltage, the above several measures. The generator is used to transport the phase, the cost is reduced, and the operation is simple and effective. It is currently widely used.

1 The phase-in operation of the generator's phase-in operation generator is a normal operation mode that adjusts the capacitive reactive power of the system under the premise of stable operation of the generator, thus adjusting the system voltage.

According to the operation of the synchronous generator. The iron core of the generator enters the phase of the hall is caused by the leakage of magnetism. The influence of the two flashing elements is synchronous. When the generator is running, its power angle characteristic is as follows: xtl, Pm is the active power output from the generator; Eq generator is rated. No load u u. Generator power. Pressure; Xd generator synchronous 屯; 8 generator's power angle, that is, the angle between the generator no-load potential and the outlet voltage.

The vector relationship between them is 1. stagnation phase operation; for phase ingress operation; 8 is generator power angle. Is the power factor angle.

In theory. When 8=90. It is the static stability limit of the generator. When the generator is running normally. Should be made 89, and leave a certain margin.

The stable operation of the generator is also affected by the heat. Especially in the phase-in operation, the end leakage flux is enhanced. Corresponding hysteresis and eddy current losses are generated on the core end members 3 to cause end member heating.

Constrained by the above factors, the static stability range of the generator-like operation 2. The arc 1 is the stator current limiting condition. Arc 2 is the rotor current limiting condition. Line 8 is the prime mover power limit condition, arc, and 0 is the parallel operation stability limit condition. The stable running area of ​​the generator is within the diagonal line.

Can be seen from 2. The phase-in operation of the generator actually expands the original operating range of the generator before the phase-in, and improves the ability of the generator to adjust the voltage of the grid. It also seems to cause a reduction in the stable reserve of the generator. In order to ensure that the unit is in the phase-in range, the generator excitation regulator should be equipped with a low-excitation limit function.

To ensure that the generator is within the given range. Prevent the generator from losing the magnetism during the phase-in operation.

A power angle meter should be installed to monitor the generator power angle during operation to ensure a stable stability margin of the generator power angle, 70.

With the renewal of the generator manufacturing process, the advancement of materials science has restricted the temperature rise of the end of the generator into the phase of the phase. It is the main factor limiting the normal phase-in operation, and the performance and debugging of the generator's automatic excitation regulator. It becomes the main basis for the phase-in operation of the hair dryer.

2 Incoming phase operation test The generator phase-in operation test shall be completed to determine the measured phase depth of the unit.

1. Check and adjust the low-excitation limit characteristic of the excitation regulator. 1 Check the change of the electrical quantity of the high-voltage side bus voltage and the power supply voltage of the generator main-side voltage of the generator.

1. Check the temperature change of the stator coil of the stator core of the hair dryer and the hydrogen in the cold water of the generator.

The generator 迸 phase setting is theoretical. Depends on the needs of the network and the phase of the generator itself. The phase-in operation test and the generator phase-incoming capability test are two different tests. The phase ingress capability test is to find out the stability limit point of the generator in various phases. In general, when the generator is in phase operation, it is not required or necessary to achieve such a phase depth. Unless the performance of the generator is assessed. Otherwise, it is not necessary to test the limit phase of the hall. Because this test poses a great risk to the stability of the system, it does not have much practical significance in normal operation.

At present, the phase-in operation is only used as a measure to regulate the grid voltage. Therefore, when determining the depth of the phase inset, the focus is shallow. As far as the stand-alone unit is concerned, the impact on the grid voltage is also very limited, and the focus is on highlighting the group's ability to make the unit with the consumption of more than 100 units on the electric machine.

Due to the influence of the measurement error of the excitation adjustment device and other operating conditions. The actual phase depth of each unit is also different. Among them, the influence of the depth of the phase advance is mainly the generator core angle and the factory power supply voltage.

Unit active and reactive power angle 6 factory power supply voltage 380, factory iron core temperature power supply voltage a factory Ren 1 a factory private 2 a factory ping 1 point parameters.

It can be seen from 1 that the temperature of the end portion has a considerable margin from the specified temperature 5 when the generator is subjected to phase test and operation.

By comparing and analyzing 1 , it can be seen that the power angle of the generator is larger when the phase is advanced in the case of high power active; while in the case of low power, although the phase of the phase is relatively deep, the power angle is still small. Therefore, the power angle of the generator has a great influence on the depth of the phase in the high active power. The temperature of the generator core is not obvious during the phase induction test. The power supply voltage of the factory has a great influence on the depth of the phase. For example, the power supply voltage of the 380 factory of Fuchang No. 2 unit reaches the allowable lower limit value of 360 when the cut-off power supply voltage is 5.881 and the lower limit voltage is 5.71. Plant No. 1 is the 6-cut voltage to reach the lower limit first, causing the depth of the phase to be affected. From the vector analysis of 2, the same conclusion is also reached. If the taps of the high and low voltage factory transformers are properly adjusted before the phase induction test, the situation will be improved.

Under the current conditions, any generator set capable of participating in the phase-in operation should be subjected to a phase-in phase test before the phase-in operation.

In the test process, the parameters of the phase-in operation are obtained, the low-excitation limit function of the automatic excitation regulator is adjusted, and the relevant parameters are adjusted according to the unit characteristics and scheduling requirements.

In the test, at each inspection point of different active power, sufficient time should be maintained to ensure that it is not less than 3, so that the temperature rise of each sound can reach a stable value.

3 Conclusion The generator phase-in operation method is used to regulate the grid voltage and economy. Feasible = It is necessary to determine the necessary conditions for the generator to enter the phase.

When the generator set enters the hall into the phase transport test. Due to the need to pay more attention to the adjustment and protection of the excitation system. therefore. Mountain relay protection excitation personnel to host the test is appropriate.

The editor Zhou Naiwen was connected to page 145. This method was also applied to the water pump on the No. 4 unit. However, after the running time, the axial displacement of the feed pump was increased and the vibration was increased. After the disintegration inspection found that the radial gap 1 was less than 1, when the value was re-adjusted to 22, the feed pump was operating normally, and no abnormality was found in the long-term operation.

6 Conclusion The top is based on the characteristics of the axial force and the balance of the balance plate.

Various methods of balancing axial forces are proposed. Before adopting these methods, it is necessary to carefully analyze the problems that occur during the operation and take corresponding measures. The analysis of multiple feed pumps for No. 4 Unit 4 of Shuangyashan Power Plant is the key to solving the practical problems.

1 Guan Xingfan. The theory and design of the pump. Beijing Machinery Industry Publishing fl1987.

2 Ma Wenzhi. High speed feed pump. Beijing Water Power Press, 19.

3 糜 If the Song and Yuan Ming. Large electric speed control feed pump port. Beijing Water and Electric Power Press, 1990.

Editor Hou Shichun

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