Ask for advice on the calculation of energy savings for reactive power compensation devices

In terms of actual electricity consumption, reactive power compensation equipment and energy saving have nothing to do with it, it can only be said that when the factory does not have reactive power compensation equipment, the power factor is relatively low (below this time, the power supply company will be fined, when you install reactive power compensation equipment, after the power factor is improved, exceed, theoretically the power supply department will have economic incentives, which can be described as energy saving from the two considerations. In addition, reactive power compensation can increase the pre-use of transformers, that is, after the installation of compensation equipment, the transformer of the same capacity can supply more electrical equipment.

The significance of reactive power compensation energy saving is to reduce line loss, and it is difficult to estimate the detailed energy saving for the power grid. Generally, the reactive power compensation energy saving of large electricity consumers is estimated by using the power factor before and after compensation and then using the energy saving rate. You can refer to the textbook of reactive power compensation written by Mr. Wang Zhaoan.

There is an input threshold and an excision threshold. If the input threshold is, then when the power factor is lower and the duration exceeds the set operating time, it will be automatically put in.

Hello dear!

The power factor set by the reactive power compensation device is expressed as the highest compensation of the capacitor cabinet, if your reactive power compensation controller is set to the automatic state, the capacitor cabinet compensation is lower than it will be automatically cast, and the higher level will be automatically cut, in addition to the compensation controller, there are the following data to be set: transformer ratio, overvoltage, low voltage, compensation power factor, switching delay time, switching paths, total capacitance capacity, single switching capacity, manual operation, automatic operation. You need all these settings to be set correctly, the reactive power compensation device can be used correctly...

I hope you can be useful...

Due to the different current controller manufacturers, the internal design industry is different, some are designed with input threshold and excision threshold, when the power factor is lower than the input threshold, and the reactive power is greater than the capacity of a single group, the capacitor will be put in. Excision capacitors above the extermination threshold.

There are also some manufacturers only set a power factor set value, that is, the ideal power factor, which will be calculated according to the reactive power size and the capacity of a single group of capacitors, if not compensated, the capacitor will be invested, if the calculation of the input will be overcompensated, will not be invested.

The total capacity of a unit's reactive power compensation device is the maximum reactive power demand of the unit's power grid. Therefore, theoretically, it is calculated from the power factor of the device. However, in reality, the load of the equipment fluctuates, and it is too difficult to calculate the power factor of the equipment.

Therefore, empirical data is often used in engineering:

30% to 40% of the capacity of the user's transformer is used as the total capacity of the compensation.

For example, if you use a 315 transformer, the compensation cabinet can be equipped with a capacity of 95kvar and 130kvar, and the final design value is determined according to some specific conditions of the equipment, such as load factor, number of compensation circuits, and other factors.

Of course, there may be not enough, or too much, you can adjust it in use, and the current capacitor ** is very low.

Reactive power compensation devices can improve the quality of the power grid.

1. Improve the power factor and reduce the electricity bill accordingly.

According to the version of the Ministry of Water and Power, the "Measures for Adjusting Electricity Charges for Power Weight Factors" promulgated by the Price Bureau stipulates three standard values of power factors, and the electricity charges are reduced accordingly

1) The power consumption unit of high-voltage power supply is above the power factor.

2) The power consumption unit of low-voltage power supply is above the power factor.

3) Agricultural users with low-voltage power supply, the power factor is above.

2. Reduce the energy consumption of the system.

The improvement of the power factor can reduce the line loss and the copper consumption of the transformer. It reduces the reactive power provided by the grid power supply to the inductive load and transmitted by the line, and can reduce the power loss caused by the reactive power transmission of the line and transformer due to the reduction of the flow of reactive power in the power grid

It depends on how to use it, and it is also necessary to understand the principle of its power-saving effect. Generally speaking, the reactive power compensation device is only installed in the unit with high-voltage metering device and the power supply company also implements the power factor assessment.

Most of the power loads in the power grid, such as motors and transformers, are inductive loads, and the corresponding reactive power needs to be provided to these devices during operation. After installing reactive power compensation equipment such as shunt capacitors in the power grid, the reactive power consumed by the inductive load can be provided, the reactive power provided by the grid power supply to the inductive load and transmitted by the line is reduced, and the electric energy loss caused by the line and the transformer due to the transmission of reactive power can be reduced because the flow of reactive power in the power grid is reduced, which is reactive power compensation.

The series reactor plays the following roles in the reactive power compensation device: 1. Suppress the inrush current when the capacitor is put into force and protect the equipment.

2. Suppress harmonics, generally choose 7% or 6% reactance, and suppress 5, 7, 11th harmonics.

3.It forms a passive filter loop with the capacitor according to the ratio to filter out the harmonic current, and the reactance rate is different according to the number of harmonics of different orders.

Very comprehensive top one!

(1) Compensating for reactive power is to improve the power factor of the microgrid, which is equivalent to improving the efficiency of the microgrid, reducing the load of the transformer and reducing the loss of the transformer.

2) reduce power loss and power loss in the power grid; Through reactive power compensation, the line loss of the microgrid can be reduced, and the power consumption can be directly reduced and the electricity cost can be reduced.

3) Improve power quality, improve the work efficiency of electrical equipment and reduce the failure rate; Reactive power compensation can improve the power quality, make the voltage and frequency more stable, and filter out certain power harmonics, so as to ensure that the electrical equipment works more stably and the work efficiency is higher, and the failure rate of the electrical equipment is reduced, which is equivalent to improving the efficiency of the equipment.

4) Reduce the investment in transformers and other equipment to save investment. After the power factor of the microgrid is improved, the load of the microgrid is reduced, and the same transformer can supply power to more equipment, which reduces the investment in substation equipment and indirectly improves economic benefits.

To put it simply, the reactive power you make up is the merit you save.

Generally speaking, for every 11 reactive power supplemented, 1 active power is saved.

In addition to generators and transmission lines, the reactive power sources mainly include: The shunt capacitor bank is a static reactive power compensation device. The compensation that is done with it is called shunt capacitance compensation.

synchronous condenser; Stationary reactive power compensator. The latter two belong to dynamic reactive power compensation devices. The performance comparison of the three reactive power compensation devices is shown in the table.

In addition, there is a shunt reactor on the outgoing bus of the remote hydropower station and the pithead thermal power plant, on the lines on both sides of the long-distance transmission line, and the switching station of the long-distance transmission line, which is also a kind of reactive power compensation device. The compensation carried out with it is called shunt reactance compensation. The shunt reactor on the outlet bus of the remote power station is mainly to absorb the reactive power generated by the generator, so that the generator can operate under a reasonable power factor and avoid the long-distance transmission of reactive power.

The shunt reactor configured on the long-distance transmission stage is mainly to absorb the charging power of the line at no load and light load, so that the voltage distribution along the line is reasonable and the power frequency steady-state and transient overvoltage are reduced.