Ask a question about reactive power compensation for wind farms.

Line loss and transformer loss need to be considered! You estimate that it is enough to compensate 2000kvar on the 35kv side.

This problem itself is not right, the power factor represents the angle between voltage and current, the power factor of the equipment in the series circuit is the same, and the power factor of each node in the parallel circuit may be different. Therefore, it is impossible to have a transformer with different power factors on the high and low voltage sides (the premise of not considering the reactive power loss of the transformer coil). When you say 110kV, you mean 110kV of the grid, not 110kV of the step-up transformer.

The 10kV bus in the factory has 10 circuits outgoing the line, and the power factor of each circuit is different according to the different loads, and the power factor at the 10kV total output switch is also different from the parallel branch of the lower level. Therefore, it makes sense to discuss the power factor on the 10kV side to indicate which node it is.

Wind power generation itself can not provide reactive power, if the asynchronous generator is adopted, the system needs to provide reactive power, because of the uncontrollability of wind power generation, resulting in the required reactive power fluctuations, and then cause voltage fluctuations at the grid-connected point, so the wind farm needs to be compensated for the reactive power of the nearest device, and the grid is not required to provide reactive power, so it will not cause voltage fluctuations.

First of all, you have to figure out whether the power plant has generated reactive power, if not, there will be no contradiction by measuring the difference in the natural power factor.

Hey. In the 31 years that our company has been engaged in the research and development, production and sales of reactive power compensation equipment, there are often novices who ask us similar questions. This way:

The monthly average power factor is generally used by the power supply company to assess the user's data, and he uses the active electricity consumption of the month and the reactive power consumption of the month to calculate, and the calculation formula is:

Monthly average power factor = monthly active power [(square of monthly active power + square of monthly reactive power)open squared].

Say a few more words: because the technology of the conventional compensation cabinet is very mature, and the components used in the cabinet are also very mature, so a large number of small factories and even small roadside electrical appliances stores dare to make compensation cabinets, which is a very fatal thing, because the technology of the industry is mature, does not mean that the producer's process and technology are mature, and does not mean that the producer does not use fake and inferior components and materials, especially a large number of low-cost cottage compensation controllers flood the market, ** looks very attractive, but a fine is enough for you to bear. Therefore, it is necessary to use a qualified manufacturer's cabinet.

Improving the power factor and doing reactive power compensation is an energy-saving technology advocated by the state, but it is highly professional and needs professionals to do it. More about reactive power compensation, power factor, etc. and other issues and information, you can four cores, you can also find and discuss here, here is a group of retired electrician old men who have studied in college, they can't do much, but they are all happy to help young people.

Summary. Between. Domestically, the power factor requirement must be between inductance and lower than the penalty required.

The main purpose of reactive power compensation is to improve the power factor of the compensation system. Because the electricity generated by the power supply bureau is calculated in kva or mva, but the charge is charged in kw, that is, the actual useful work is charged, and there is a difference between the ineffective power, which is generally the reactive power in kvar.

In the wind farm, is the reactive power compensation device compensating for the reactive power energy converted by the wind turbine? What is the approximate conversion ratio?

Between. Domestically, the power factor requirement must be between inductance and lower than the penalty required. The main purpose of reactive power compensation is to improve the power factor of the early shelter compensation system.

Because the electricity generated by the power supply bureau is calculated in kva or mva, but the charge is charged in kw, that is, the actual useful work done to charge, there is a difference in ineffective power between the two, and the trouser macro is generally the reactive power in kvar.

Where does the reactive power of wind farms come from? You didn't post it yourself, did you?

1. Theoretically, the fan is to generate a certain reactive power, but the reactive power compensation is carried out in accordance with the relevant standards and regulations; Due to the different designs, some wind and plum gear machines cannot adjust the reactive power output, but only control the power factor within a certain range; With the increasing installed capacity of wind turbines and the impact on the power grid, many wind farms now require wind turbines with a certain reactive power regulation capacity to support the power grid. 2. The use of permanent magnets eliminates the excitation link, and the key to power generation of the unit is grid connection and power control. 3. As mentioned on the second floor, the grid-connected frequency of the fan is 50Hz, and the synchronous speed of the two pole pairs is 1500rm.

At present, according to the existing technology, the fan is generally more than 10Hz, which is either a direct-drive multi-pole logarithmic generator, or needs to be adjusted by a speed-increasing gearbox. Not all of them, depending on the type of unit, such as some stall units.

Now that the general wind farm has SVG and device, does it affect the active activity of the wind turbine in normal operation?

Not. A thermal power plant and a wind power plant are in the same booster station at the main transformer outlet of the power plant, can the real thermal power plant sell the reactive power compensation required by the wind power plant? Cancellation of SVG installations in wind farms?

Can. Cancel. In this case, will there be an impact on the actual on-grid electricity of the wind farm? Will there be more after the cancellation of SVG?

No. Where does SVG's usual reactive energy come from?

SVG reactive power compensation is to adjust the phase and amplitude of the output voltage on the AC side of the bridge full control circuit, and the silver ruler can control the current injected into the bridge power grid through the grid-connected inductance, so that the circuit can absorb or emit reactive power that meets the requirements, detect the load in real time and compensate for it.