Harmonic control method
At present, there are two kinds of commonly used methods for harmonic control: KYLB passive filtering and KYYLB active filtering. Let's talk about the advantages and disadvantages of these two methods as well as the analysis of market prospects and their economic benefits.
KYLB passive filter device
The main structure of the KYLB passive filter device is to use a reactor and a capacitor in series to form an LC series circuit that is connected in parallel with the system. The resonant frequency of the LC circuit is set at the harmonic frequency that needs to be filtered out, for example, 5 times, 7 times. At the eleventh and eleventh resonance points, this third harmonic was filtered out. The cost is low, but the filtering effect is not very good. If the resonant frequency is not set well, it will generate resonance with the system. Nowadays, KYLB passive filtering devices are the most commonly used filtering methods in the market, mainly because of the low cost and user acceptance. Although the effect of filtering is poor, as long as the country meets the harmonic limit standards and the power sector's requirements for reactive power. Due to its low cost, the market demand is also large. In general, most low-voltage 0.4KV systems use KYLB passive filter devices, and high-voltage 10KV is almost always using this method to control harmonics. Since most of the small and medium-sized enterprises in China are privately owned, the owners do not fully understand the hazards of harmonics and are generally reluctant to use large sums of money to control harmonics. However, some companies have too many harmonics to compensate for their conventional reactive power. Can not be effective, the power supply department's requirements for reactive power is very strict, and it will not be fine. Therefore, the landlord had to request filtering. Therefore, its market prospects are considerable, and economic benefits are also considerable.
KYYLB active power filter device
KYYLB active power filter device is developed on the basis of KYLB passive filter device, and its filtering effect is good. In its rated reactive power range, the filtering effect is 100%. It is mainly composed of power electronic components circuit, so that it produces a harmonic and the system with the same frequency, the same amplitude, but the harmonic current in the opposite phase of the system harmonic current offset. However, due to the pressure resistance of the power electronic components and the limited development of the rated current, the cost is extremely high, and its production is much more complicated than the KYLB passive filter device, and the cost is much higher. Its main application scope is the power supply system of the computer control system, especially the power supply system of the office building, and the computer-controlled power supply system of the factory. For a single KYYLB active power filter device, users generally do not want to use KYYLB active power filter device. For harmonic content, it is not necessary to filter it too clean, as long as it does not harm other electrical appliances.
KYLB passive filter device classification and technical content
KYLB passive filter devices, also known as LC filters, can be divided into single-tuned filters, double-tuned filters, and high-pass filters. In practical applications, several sets of single-tuned filters and several sets of high-pass filters are often used to form a filter device. The single-tuned filter is also called a single-tuned filter loop, which is mainly composed of a controller, a capacitor, a reactor, a switching switch, and a control loop and a protection loop thereof. It is the same regardless of high pressure and low pressure. Since the single-tuned filter uses fewer components and costs less, it is extremely popular and the application is more extensive. The difference between the high-voltage filter and the low-voltage filter is mainly that the used components have different withstand voltages, the current they receive is different, the required safety distance is also different, and the degree of difficulty in designing and manufacturing is also extremely limited. Big difference. How much the harmonics are filtered depends on the actual situation of each project, which is generally 20% to 50% of the original harmonic content of the system. Also, depending on the specific conditions of the project, several sets of filters can be set up, and the filtering effect can reach over 70% of the original harmonic content. However, this requires more efforts in the protection circuit and the protection circuit is relatively complicated. In short, the final result of the filtering is to make the harmonic content of the system meet the requirements of national standards or the user's requirements for harmonics. We know that capacitors compensate for reactive power. We also use capacitors in the filter loop. Its role at harmonic frequencies is filtering, but at the fundamental frequency it is reactive compensation. Therefore, the filter capacitor In the fundamental frequency is to play a role in reactive power compensation.
The main voltage level of KYLB low voltage passive filter compensation device is 400V, 660V, 1000V. This mainly depends on the user's voltage level. The size of the filtered current also depends on the harmonic current of the system in which the harmonics are to be filtered. KYTBBL high-voltage passive filter compensation device generally refers to 6KV, 10KV, 35KV voltage levels, in general, KYTBBL high-voltage passive filter compensation device is mainly filtered in 6KV, 10KV systems.
KYLB Low Voltage Passive Filter Compensation Device
The design of KYLB low-voltage passive filter compensation device should follow the relevant national regulations. In general, KYLB low-voltage passive filter compensation device is cabinet-mounted. KYLB low-voltage passive filter compensation device design and evaluation of the effect, mainly to see whether the effect is really filtered harmonics, whether to follow the national standards on harmonics. Each cabinet can be installed from 2 to 5 channels, depending on the circumstances.
KYTBBL high pressure passive filter compensation device
KYTBBL high-voltage passive filter compensation device can be cabinet-mounted or frame-mounted. Filtering capacitors and filter reactors are used to compose an LC single-tuned filter loop, which filters out a certain harmonic wave. The reactor can be iron core. According to the power of the application, the reactor can also use air core reactor. Because of the high pressure, it must meet the relevant regulations of the country for high voltage devices.
At present, there are two kinds of commonly used methods for harmonic control: KYLB passive filtering and KYYLB active filtering. Let's talk about the advantages and disadvantages of these two methods as well as the analysis of market prospects and their economic benefits.
KYLB passive filter device
The main structure of the KYLB passive filter device is to use a reactor and a capacitor in series to form an LC series circuit that is connected in parallel with the system. The resonant frequency of the LC circuit is set at the harmonic frequency that needs to be filtered out, for example, 5 times, 7 times. At the eleventh and eleventh resonance points, this third harmonic was filtered out. The cost is low, but the filtering effect is not very good. If the resonant frequency is not set well, it will generate resonance with the system. Nowadays, KYLB passive filtering devices are the most commonly used filtering methods in the market, mainly because of the low cost and user acceptance. Although the effect of filtering is poor, as long as the country meets the harmonic limit standards and the power sector's requirements for reactive power. Due to its low cost, the market demand is also large. In general, most low-voltage 0.4KV systems use KYLB passive filter devices, and high-voltage 10KV is almost always using this method to control harmonics. Since most of the small and medium-sized enterprises in China are privately owned, the owners do not fully understand the hazards of harmonics and are generally reluctant to use large sums of money to control harmonics. However, some companies have too many harmonics to compensate for their conventional reactive power. Can not be effective, the power supply department's requirements for reactive power is very strict, and it will not be fine. Therefore, the landlord had to request filtering. Therefore, its market prospects are considerable, and economic benefits are also considerable.
KYYLB active power filter device
KYYLB active power filter device is developed on the basis of KYLB passive filter device, and its filtering effect is good. In its rated reactive power range, the filtering effect is 100%. It is mainly composed of power electronic components circuit, so that it produces a harmonic and the system with the same frequency, the same amplitude, but the harmonic current in the opposite phase of the system harmonic current offset. However, due to the pressure resistance of the power electronic components and the limited development of the rated current, the cost is extremely high, and its production is much more complicated than the KYLB passive filter device, and the cost is much higher. Its main application scope is the power supply system of the computer control system, especially the power supply system of the office building, and the computer-controlled power supply system of the factory. For a single KYYLB active power filter device, users generally do not want to use KYYLB active power filter device. For harmonic content, it is not necessary to filter it too clean, as long as it does not harm other electrical appliances.
KYLB passive filter device classification and technical content
KYLB passive filter devices, also known as LC filters, can be divided into single-tuned filters, double-tuned filters, and high-pass filters. In practical applications, several sets of single-tuned filters and several sets of high-pass filters are often used to form a filter device. The single-tuned filter is also called a single-tuned filter loop, which is mainly composed of a controller, a capacitor, a reactor, a switching switch, and a control loop and a protection loop thereof. It is the same regardless of high pressure and low pressure. Since the single-tuned filter uses fewer components and costs less, it is extremely popular and the application is more extensive. The difference between the high-voltage filter and the low-voltage filter is mainly that the used components have different withstand voltages, the current they receive is different, the required safety distance is also different, and the degree of difficulty in designing and manufacturing is also extremely limited. Big difference. How much the harmonics are filtered depends on the actual situation of each project, which is generally 20% to 50% of the original harmonic content of the system. Also, depending on the specific conditions of the project, several sets of filters can be set up, and the filtering effect can reach over 70% of the original harmonic content. However, this requires more efforts in the protection circuit and the protection circuit is relatively complicated. In short, the final result of the filtering is to make the harmonic content of the system meet the requirements of national standards or the user's requirements for harmonics. We know that capacitors compensate for reactive power. We also use capacitors in the filter loop. Its role at harmonic frequencies is filtering, but at the fundamental frequency it is reactive compensation. Therefore, the filter capacitor In the fundamental frequency is to play a role in reactive power compensation.
The main voltage level of KYLB low voltage passive filter compensation device is 400V, 660V, 1000V. This mainly depends on the user's voltage level. The size of the filtered current also depends on the harmonic current of the system in which the harmonics are to be filtered. KYTBBL high-voltage passive filter compensation device generally refers to 6KV, 10KV, 35KV voltage levels, in general, KYTBBL high-voltage passive filter compensation device is mainly filtered in 6KV, 10KV systems.
KYLB Low Voltage Passive Filter Compensation Device
The design of KYLB low-voltage passive filter compensation device should follow the relevant national regulations. In general, KYLB low-voltage passive filter compensation device is cabinet-mounted. KYLB low-voltage passive filter compensation device design and evaluation of the effect, mainly to see whether the effect is really filtered harmonics, whether to follow the national standards on harmonics. Each cabinet can be installed from 2 to 5 channels, depending on the circumstances.
KYTBBL high pressure passive filter compensation device
KYTBBL high-voltage passive filter compensation device can be cabinet-mounted or frame-mounted. Filtering capacitors and filter reactors are used to compose an LC single-tuned filter loop, which filters out a certain harmonic wave. The reactor can be iron core. According to the power of the application, the reactor can also use air core reactor. Because of the high pressure, it must meet the relevant regulations of the country for high voltage devices.
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