What is the reactive power compensation of filter compensation, and the hysteresis compensation of f

Filter hysteresis compensation is a technique to solve filter hysteresis by delaying the filter's output response to align it with the desired output.

The principle of hysteresis compensation is to insert an appropriate delay before the output signal of the filter to align it with the desired output. There are many types of hysteresis compensation, such as time delay compensation, integral compensation, proportional compensation, and integral-proportional compensation, which are used to solve the hysteresis problem of different filters.

Time delay compensation is the most common method of hysteresis compensation, which solves the hysteresis problem of the filter by inserting an appropriate delay before the output signal of the filter. Integral compensation is an integral-based compensation method that compensates for the hysteresis of the filter through integration operations to achieve the consistency of the output signal with the desired signal. Proportional compensation is also a commonly used hysteresis compensation method, which uses the proportional coefficient to compensate the hysteresis of the filter to achieve the consistency of the output signal with the desired signal.

Integral-proportional compensation is a compensation method that combines the characteristics of integral compensation and proportional compensation, which can realize hysteresis compensation and stability control at the same time to achieve the consistency of the output signal with the desired signal.

1 Hysteresis compensation for filters is a technique used to eliminate hysteresis in the output signal of a filter.

2 There is usually a certain delay in the output signal of the filter, which is caused by the characteristics of the filter itself.

To eliminate this delay, hysteresis compensation techniques can be employed by introducing appropriate delay elements or by adjusting the parameters of the filter.

3 Hysteresis compensation technology is widely used, such as in the fields of positive frequency signal processing and control systems.

Through hysteresis compensation technology, the response speed and stability of the system can be improved, thereby improving the performance of the system.

Passive filtering provides reactive power compensation while providing filtering.

One. The basic principle of reactive power compensation: the power output of the grid consists of two parts:

The first is active power: directly consume electric energy, convert electrical energy into mechanical energy, thermal energy, chemical energy or sound energy, and use these energy to do work, this part of the power is called active power; The second is reactive power: it does not consume electric energy, but only converts electric energy into another form of energy, which is used as a necessary condition for electrical equipment to be able to work, and this energy is periodically converted with electric energy in the power grid, and this part of the power is called reactive power (such as the electrical energy occupied by electromagnetic components to establish a magnetic field, and the electric energy occupied by a capacitor to establish an electric field).

The specific implementation of reactive power compensation: the device with capacitive power load and the inductive power load are connected in parallel in the same circuit, and the energy is exchanged between the two loads. In this way, the reactive power required by the inductive load can be compensated by the reactive power output by the capacitive load.

The significance of reactive power compensation:

Compensating for reactive power can increase the proportional constant of active power in the grid.

Reduce the design capacity of power generation and power supply equipment, reduce investment, for example, when the power factor cos = increases to cos =, installing 1kvar capacitors can save equipment capacity; On the contrary, for the original equipment, the increase is equivalent to increasing the capacity of power generation and power supply equipment. Therefore, for new construction and renovation projects, reactive power compensation should be fully considered, so as to reduce the design capacity and thus reduce the investment.

To reduce the line loss, the formula δ %=(1-cos cos) 100% is obtained, where cos is the power factor after compensation, and cos is the power factor before compensation

COS > COS, so after improving the power factor, the line loss rate also decreases, reducing the design capacity, reducing investment, increasing the proportion of active power transmission in the power grid, and reducing the line loss all directly determine and affect the economic benefits of power supply enterprises. Therefore, the power factor is an important indicator for assessing economic benefits, and it is imperative to plan and implement reactive power compensation.

Two. The passive filter is composed of passive components such as LC, which is designed to have very low impedance at a certain frequency, and shunts the harmonic current of the corresponding frequency, and its behavior mode is to provide a passive harmonic current bypass channel; The active filter is an electric energy conversion device composed of power electronic components and DSP, etc., which detects the harmonic current of the load and actively provides the corresponding compensation current, and the source current after compensation is almost pure sine wave, and its behavior mode is the active current source output.

Founded in October 2005, the company is a professional manufacturer specializing in harmonic filtering and reactive power compensation devices for power systems. The products are oriented to power saving, environmental protection and high efficiency, and mainly serve metallurgy, electric power, petroleum, chemical and other systems.

Active filters do not have to be used in conjunction with reactive power compensation devices. It depends on whether the system to be tested is used together

1.When the harmonics in the system are serious and the reactive power demand is large, they will be used together, at this time, the function of the active filter is harmonic control, and the reactive power compensation device does reactive power compensation. Of course, active filters can also be used for reactive power compensation, but the cost is high, so this method is chosen.

2.When the harmonics in the system are large and the power factor is high, only the active filter will be used, and there is no need to do reactive power compensation.

3.When the harmonics in the system are small and the power factor is low, only reactive power compensation is generally used instead of active filters.

During the use of active filters, it should be noted that they must not be used in parallel with pure capacitance compensation and passive filters.

The active filter and the reactive power compensation device are respectively for the harmonic and reactive power in the power grid to control, when to use together, naturally in the detection of harmonics in the power grid, and need to improve the reactive power of the equipment to use together.

Active filtering itself filters out harmonics and does not provide reactive power compensation. When the harmonic content in the system is relatively high and the power factor is relatively low, they should be used together, in fact, they are generally used together, using reactive power compensation to reduce the current and improve the power factor, and actively control the harmonics.

Beijing Lingbu will answer for you, according to the different conditions of the power grid system, divided into the following types:

1. When the harmonics in the system are serious and the reactive power demand is large, not only the active filter is required for harmonic control, but also the reactive power compensation device is required for reactive power compensation. Of course, active filters can also be used for reactive power compensation, but the cost is high, so this method is chosen.

2. When the harmonic in the system is large and the power factor is high, only the active filter is generally used, and there is no need to do reactive power compensation.

3. When the harmonic in the system is small and the power factor is low, only reactive power compensation is generally used, and active filters are not used.

Note: The active filter cannot be used in parallel with the pure capacitor compensation and passive filter during use.

The main objectives of the two are not the same, one is to compensate for reactive power and the main auxiliary filter is used for medium and high voltage, and the other is to filter for the main auxiliary compensation for low voltage.

Hehe they are two categories of devices, but from a functional point of view, they have a great intersection, and if you don't look at the difference in their power capacity, you can even think of the "dynamic reactive power compensation device" as a subset of the "active filter".

The dynamic reactive power compensation device only compensates the reactive power, and its response is very fast, that is, the compensation speed is very fast.

The active filter is mainly used to filter out harmonics in the power grid, but it has the ability to compensate for reactive power, and the response speed of compensation is faster. In the current products, the power capacity of the active filter is relatively small and high, so it is rarely used for reactive power compensation.

Dynamic reactive power compensation device is referred to as SVG, and active filter is referred to as APF, which are electronic devices for controlling electrical energy pollution. The difference is that it is mainly aimed at the governance problem, APF is mainly for the harmonic treatment in the power grid, although it can correct the power factor, but it can not do a wide range and accuracy in compensating for reactive power. The dynamic reactive power compensation device mainly improves the power factor and compensates for reactive power.

It has no control effect on harmonics of each frequency. If the power grid needs to control harmonics and compensate reactive power at the same time, these two devices can be applied at the same time, and the cabinet application can be used.

Yes. 1. It can send out inductive reactive power or capacitive reactive power that needs to be compensated 2. It can send out harmonic currents of equal magnitude and opposite directions, which has improved the power quality of the site. 3. If the capacity is large enough, it can be managed to an ideal state by reactive power and harmonic colleagues.

The harmonic current is a part of the reactive current, and the active filter filters out the harmonic current to compensate for the reactive power.

No, although SVG and APF principles are the same, both are inverter principles, but the waveform generated by active filtering is reversed with the harmonics in the line to cancel the line harmonics, and SVG is to generate a current of the same frequency and not in phase with the line and send out or absorb reactive power, the waveform generated by the two is not the same, so reactive power compensation can not be realized, although the power factor has a certain relationship with the harmonic, but it has little to do with reactive power.

OK! Now there are two basic functions of active filters: harmonic control and reactive power compensation. It has an internal electrolytic capacitor that can provide capacitive current and reactive power compensation.

The cost of using active filters for reactive power compensation is too high.

Absolutely.

The active filter has an electrolytic capacitor inside to provide capacitive current and compensate for reactive power.

Reactive power compensation, referred to as reactive power compensation, plays a role in improving the power factor of the power supply system of the power grid, reducing the loss of power supply transformers and transmission lines, improving power supply efficiency and improving the power supply environment. Therefore, the reactive power compensation device is in an indispensable and very important position in the power supply system. Reasonable selection of compensation devices can minimize the loss of the power grid and improve the quality of the power grid.

On the contrary, if the selection or use is improper, it may cause many factors such as power supply system, voltage fluctuations, harmonic increases, etc.

Application of filter compensation device.

The automatic control of the low-voltage filter compensation device adopts the sequential switching mode of first cast and then switch, and then throws and first cuts to monitor the voltage, current, power factor, compensation state and other parameters of the system in real time, effectively filter out the load harmonics, and shunt about 70% to 90% of the characteristic subharmonic current filtering The investment cost is low, the technology is mature, the performance is stable, and it is suitable for most of the filter compensationMSFGD is suitable for the safety compensation that requires both the improvement of the power factor and the filtering effect.

Typical loads are used in: annealing furnace harmonic control, intermediate frequency furnace harmonic control, high-frequency furnace harmonic control, ceramic harmonic control, etc.

Application of reactive power compensation device MSCGD.

The automatic control of the low-voltage filter compensation device adopts the sequential switching method of first investment and then cutting, and then throwing and switching in real time, and monitors the voltage, current, power factor, compensation state and other parameters of the system in real time, effectively avoiding capacitive resonance, and shunting about 20% to 30% of the characteristic subharmonic current, with low investment cost, mature technology and stable performance, and is suitable for most of the low-voltage compensation low-voltage automatic reactive power compensation and detuning device MSCGD is suitable for safety compensation that only requires the improvement of the power factor, but does not require the harmonic control filtering effect. Typical applicable loads: motors, residential quarters, papermaking, textile, rubber industry, subway, electrolysis industry, etc.

According to the position of harmonic governance, there can be three schemes:

Harmonic control scheme 1: In the high-voltage bus, the equipment used is SVC, SVG, etc.

Harmonic control scheme 2: At the lower end of the transformer, the harmonic control is controlled on the low-voltage bus. It adopts KYLB passive filter device, KYYLB active power filter, etc. Kylb passive filters tend to emit additional capacitive power, which is not allowed in some cases.

Harmonic control scheme 3: Harmonic control at the power supply entrance of the equipment. This is called governance in place. In-situ governance is the most ideal harmonic governance strategy. Because, this is equivalent to converting a nonlinear load into a linear load, and all the problems caused by harmonics are solved.

Harmonic control design for the power consumer.

Press"Whoever interferes, who pollutes, who remediates"The principle of harmonic source user-side governance. That is, for users who generate a large number of harmonics, a harmonic filter device is installed on the low-voltage side of the user transformer. According to the principle of the device, it can be divided into KYSVG dynamic reactive power compensation device, KYLB passive filter device and KYYLB active power filter.

1) For high-voltage and large-capacity electric arc furnaces that produce large harmonics, voltage flicker, three-phase unbalance and other phenomena, it is suitable to use KYSVG dynamic reactive power compensation device.

2) For the harmonics generated by low-voltage (below 1kV) welding machine group and inverter group, etc., which have the characteristics of large harmonic fluctuation and large characteristic harmonic changes, especially for projects where harmonic sources are relatively scattered, it is suitable to use kyylb active power filter for treatment in centralized treatment. For high power factor harmonic sources, such as some intermediate frequency furnaces, the use of kyylb active power filter scheme for the inverter is the most economical solution.

3) For the harmonic source of the high-voltage power grid, the capacity is small (generally according to the transformer capacity of 20MVA as the standard), whether it is the treatment of harmonic sources such as electric arc furnace and intermediate frequency furnace, it is recommended to design according to the kytbbl high-voltage filter compensation device, which can economically solve the problem of voltage fluctuation and harmonics.

4) For low-voltage harmonic sources such as intermediate frequency furnaces, inverter groups, rolling mills, etc., if a single capacity is large, it can be considered to be treated locally according to the KYLB low-voltage filter compensation device, and the effect is the best.

5) For projects where the low-voltage harmonic source is relatively dispersed and the reactive power factor is low, it is recommended to design according to the KYLB active and passive hybrid filter device scheme.