The active power generator is always over reactive, how to reduce the reactive power and more reacti

When the generator voltage is too low, the excitation current can be increased to increase the voltage, but at the same time, the reactive power output will also increase. If the active power generator is always over-generated, check whether the voltage is too high, if it is too high, the excitation current can be reduced, and the reactive power output will also be reduced; Another possibility is that the reactive power demand of the load is too large and is forced to increase the excitation current to increase the reactive power output, at this time, an appropriate amount of capacitance compensation can be put in, and the excitation current can be reduced to make the generator improve the efficiency of the active energy output.

Yours is grid-connected power generation, grid-connected must meet the three conditions: the same phase, the same frequency (frequency), the same voltage, the phase of the generator that has been connected to the grid must be no problem, the key is frequency and voltage, the generator frequency is controlled by the speed, the voltage is controlled by the excitation current, either of these two do not keep up with the main grid (synchronization), you are reactive power, (if there is no protection) sometimes backflow to burn the generator, obviously only by adjusting the excitation current (voltage) is not good, The speed (frequency) of the generator must be adjusted (to control the amount of water) to reduce the reactive power.

In general, the reactive power of the generator can be artificially adjusted, and the given value of reactive power can be appropriately reduced to reduce the reactive power emitted. Or try to reduce the generator voltage, and the reactive power will also be less.

In any case, as long as the power meter indicates a decrease, it means that the active power is reduced and the power is reduced.

Hope it helps!!

Active and reactive power is determined based on your load characteristics. If the reactive power of the generator is high, it is generally determined by the small power factor of the load, and the generator must compensate for the reactive power in order to ensure the stability of the voltage. Reducing the excitation current The active power changes very little, but the reactive power decreases.

Generally, it is to look at the reactive power regulation excitation, and look at the active power to adjust the throttle (prime mover) only as a supplement.

When the generator is not fully loaded, the reactive power is higher than the active power, indicating that the reactive power output by the generator is larger, while the active power is smaller. In this case, the generator will generate more ineffective power consumption, which will make it less efficient.

Specifically, the power output of the generator is divided into two parts: active power and reactive power. Active power is used to drive loads, such as motors, lamps, etc., while reactive power is mainly used to generate electromagnetic fields and magnetic fluxes to ensure the stability and safety of the power system. When the reactive power is higher than the active power, the phase difference between the voltage and current output by the generator will increase, resulting in the decrease of the power factor of the power system and the efficiency of the system.

In addition, if the reactive power is too much higher than the active power, it may also cause the voltage of the power system to be unstable, thus affecting the normal operation of the system.

Therefore, in practical application, the beam needs to control the excitation current of the generator and adjust the load, so that the ratio of active power and reactive power is appropriate, so as to ensure the efficient operation of the generator and the stability of the power system.

It may even trigger overvoltage protection, which can affect the stability of the grid. This is because the power output of the generator can be divided into two parts: active power is used to drive loads such as motors to perform mechanical work, while reactive power is used to maintain grid voltage stability.

When the generator is not fully loaded, the active power required by the waiting load is less, and the reactive power output of the generator accounts for a larger proportion at this time, if the reactive power is higher than the active power, it may lead to the increase of the grid voltage. If the voltage rises too quickly or too high, it can affect the stability of the grid and also cause damage to other equipment in the grid. Therefore, in actual operation, it is necessary to reasonably control the dull vertical power and reactive power output of the generator according to factors such as load conditions and power grid requirements, so as to ensure the stability and reliability of the power grid.

The rated power factor of the generator is generally specified in the lag), that is to say, the reactive power of the generator is generally brought to one-third to one-half of the active power.

How much is appropriate for the reactive power band, the main root is based on the stator voltage of the generator. When the system voltage is low, the stator voltage of the generator will also drop, in order to maintain the stator voltage, there is no need to pay attention to the power factor at this time, even if the reactive power is as large as the active power, or even if the reactive power is greater than the active power (provided that the rotor voltage, rotor current and temperature allow). If the power factor is too low, it is just a waste of the rotor heating power source.

So what's the harm of having too much power factor? When the reactive power reaches zero, or even enters a negative value (ahead), it will not cause direct harm to the generator, but will weaken the tightness of electromagnetic induction between the generator and the system, and weaken the stability of the generator's operation. When the system is impacted, the generator whose power is too high due to hail and locust number (reactive power is too low) is in danger of losing synchronization!

The reactive power of the generator is generated by the rotor excitation.

When the generator potential is equal to the voltage, there is no reactive power delivery. When the generator potential is higher than the voltage, reactive power is sent outward.

Reactive power: The electrical power used for electric and magnetic fields in circuits, and used to establish and maintain magnetic fields in electrical equipment. Electrical equipment with a solenoid anterior core needs to establish a magnetic field, i.e., consume reactive power.

For example, a 40-watt fluorescent lamp, in addition to 40 watts of active power to make it shine, also needs about 80 watts of reactive power for the coil of the ballast to establish an alternating magnetic field. Because it does not do work externally, it is called"Reactive"。

Yes, but the impact is minimal. When the active power of the generator is adjusted, the reactive power will automatically change in the opposite direction, which can be explained by the "power angle characteristics of the generator". The active power of the generator is proportional to sinδ, when the active power is increased to open the valve, the power angle of the generator δ increases, and the sinδ increases, but the reactive power of the generator is proportional to the cosδ, when the δ increases, the cosδ decreases, so the reactive power decreases.

The active power adjustment of the generator is carried out by the governor, and is realized by changing the output of the prime mover such as the valve (thermal power unit) or the opening of the water guide blade (hydropower unit). The reactive power adjustment of the generator is carried out by the generator excitation regulator, which is carried out by changing the excitation current and adjusting the voltage of the generator.

Your question is contradictory.

The generator power factor is the ratio of the active power p to the apparent power s.

Whereas, the apparent power s is the square and root of the active power p and the reactive power q.

That is to say, if the power factor of the generator is 1, then the reactive power is zero, and there is no saying that the reactive power is greater than the active power.

Phase Advance Operation refers to:

According to the requirements of the power system to reduce the system voltage, the excitation current of the generator continues to decrease, and the reactive power emitted is negative (that is, the reactive power is absorbed from the power grid), and the power factor of the generator is ahead (that is, the stator current is ahead of the voltage).

Therefore, the key to whether to enter the phase is not the reactive power size, but the symbol of reactive power. As long as the power grid absorbs reactive power, it is in-phase operation.

If the reactive power COS is too low, the excitation current and stator current of the engine will increase, which will heat up the equipment and increase the chances of equipment aging and switch tripping.

Effect of reactive power on generator operation:

When the power factor increases, the reactive power decreases (when the power factor is 1, the reactive power is 0), and the excitation current decreases, which leads to the decrease of the suction force between the rotor and the stator poles of the generator, thereby destroying the static stability of the generator; When the power factor decreases, the reactive power increases, and the excitation current needs to be increased in order to maintain the stator voltage unchanged due to the demagnetization effect, so that the rotor winding temperature rises and overheats.

Too high or too low the power factor has an impact on the operation of the generator, mainly at full load.

Power factor cos = active power apparent power.

When the active load is full, the COS is too high, that is, the reactive power is too low, which reduces the reactive power margin of the system and affects the stability of the generator. Although the economy is improved, in the long run, this is in exchange for increasing the probability of accidents, once a sudden accident occurs, the generator may not be able to withstand a small disturbance or **, may lose step. In addition, too low reactive power will cause the voltage at the generator end to drop, and the electrical system will be affected.

The current drawn by the electrical equipment rises, and the voltage is lower, forming a vicious circle, which may cause the entire system to lose stable operation and collapse.

Too high a COS also increases the chance of the generator entering the phase, making it easy for the engine end to heat up.

If the COS is too low, the reactive power is too high, the excitation current rises, the rotor winding temperature rises, and the life is shortened.

If the COS is too low, the voltage at the generator end will rise, the magnetic flux density in the core will increase, the loss will also increase, and the temperature of the core will rise.

When the generator is running at the rated load, the COS is too low, and the excitation current and stator current of the engine increase, which will heat up the equipment and increase the chances of equipment aging and switch tripping.

In the usual operation monitoring, it is necessary to adjust according to the voltage, the voltage is low to generate more reactive power, the voltage is high to generate less reactive power, by adjusting the proportion of active and reactive, control the voltage and operating current, to ensure that the generator operates under safe and economical conditions.

The so-called generator reduces reactive power, that is, the generator reduces the reactive power output, which has no effect on the generator itself, which can reduce the excitation current and reduce the heat generation of the rotor. However, the power grid lacks this part of the reactive power, and the corresponding reactive power needs to be sought from other places, otherwise the reactive power loss in the power grid will increase.

If there is inductance and capacitance in the load, in these components it needs to consume power to store energy, capacitors store electrical energy, and inductors store magnetic field energy, but these energies are not really consumed, but only stored in different forms, so this part of the energy is called reactive power. Therefore, the reason for the reactive power of the generator is to look at the situation of the load, if the load needs reactive power for energy storage, the generator will emit reactive power, for example, when the transformer is working, its primary and secondary coils need to transmit energy through the magnetic field, then this magnetic field is only used as a medium for transmission, and does not really consume power (such as converting into heat energy), so it only uses this part of the energy to generate a magnetic field, that is, it consumes reactive power to establish a magnetic field.

Reactive power squared + active power squared = apparent power squared.

If the active and terminal voltages of the generator remain unchanged, the excitation current needs to be reduced to reduce the reactive power, and the excitation electromotive force decreases, and the work angle A increases according to PEM=EUSINA X.