我司有源電力濾波器(APF) 主電路為IGBT 功率變換器，采用基于瞬時無功功率理論的檢測技術，自動跟蹤電網諧波變化，具有高度可控性與快速響應性?？朔藗鹘y(tǒng)無源濾波器的濾波效果差，容易發(fā)生諧振、只能補償固定次諧波等缺點，對各種快速瞬變的沖擊性負荷均能起到良好的濾波和補償效果。
產品概述 Product Overview
我司有源電力濾波器(APF) 主電路為IGBT 功率變換器，采用基于瞬時無功功率理論的檢測技術，自動跟蹤電網諧波變化，具有高度可控性與快速響應性。克服了傳統(tǒng)無源濾波器的濾波效果差，容易發(fā)生諧振、只能補償固定次諧波等缺點，對各種快速瞬變的沖擊性負荷均能起到良好的濾波和補償效果。
AB-APF有源電力濾波器采用軍工級控制芯片，計算能力及抗干擾能力極強，可實現一個控制器集中控制多臺有源濾波器并聯工作，采用自適應電流平均值控制算法并結合LCL 拓撲結構，克服了傳統(tǒng)的滯環(huán)電流控制由于開關頻率變化所帶來的輸出頻譜范圍寬、濾波較困難、高頻諧波會干擾電網等缺點。
The main circuit of our active power filter (APF) is IGBT power converter, which adopts the detection technology based on instantaneous reactive power theory and automatically tracks the harmonic changes of the power grid, with high controllability and fast response. It overcomes the shortcomings of traditional passive filters such as poor filtering effect, easy resonance, and only compensating fixed harmonics, and can play a good filtering and compensation effect on various fast transient shock loads.
AB-APF active power filter adopts military-grade control chip, which has strong calculation ability and anti-interference ability, and can realize one controller to centrally control multiple active filters working in parallel. The disadvantages of traditional hysteresis loop current control such as wide output spectrum, difficult filtering, and high frequency harmonics that interfere with the power grid.
型號及其含義 Model number and it s meaning
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AB-APF 諧波治理原理 AB-APF harmonic c ontrol principle
AB-APF 通過外部互感器CT 實時采集電流信號，通過內部檢測電路分離出其中的諧波部分，通過IGBT 功率變換器產生與系統(tǒng)的諧波大小相等相位相反的補償電流注入電網，實現濾波除諧波的功能。
AB-APF collects the current signal in real time through the external transformer CT, separates the harmonic part of it through the internal detection circuit, and generates the compensation current of equal size and opposite phase with the system's harmonics through the IGBT power converter to inject into the power grid to realize the function of filtering and removing harmonics.
技術優(yōu)勢 Technical Advantages
◇ 模塊化、積木擴展式并聯結構，方便擴容
AB-APF 有源電力濾波器為積木擴展式并聯結構：主電路中的每個電氣元件都小型化和標準化，整個拓撲封裝在一個的模塊內。AB-APF 模塊與AB-APF 柜體采用動靜插件連接，用戶擴容時把AB-APF 模塊推進AB-APF 柜體內，插上CAN 接口。
◇ 維護便捷，支待在線維護
AB-APF 有源電力濾波器采用模塊化設計，任何一個電氣元件損壞只會影響當前模塊運行，AB-APF 柜體內其他模塊正常運行，不會導致整個AB-APF 癱瘓。維護時只需把故障AB-APF 模塊從柜體中抽出，更換上新的AB-APF 模塊即可。
◇ 可靠性高，濕度均勻
AB-APF 有源電力濾波器把發(fā)熱元件如：逆變單元中的IGBT、LCL 濾波器中的濾波電感和阻尼電阻都微型化，功率減小。而且發(fā)熱元件平均分配到每個濾波模塊中，熱量均勻。電氣元件不易發(fā)生因為濕度過高而失效。
◇ 純FPGA 搭建控制系統(tǒng)
AB-APF 有源電力濾波器控制系統(tǒng)采用軍工級FPGA 芯片，芯片內部集成84 個硬件DSP 單元，運算能力遠遠大于單個DSP，燒錄程序后整個FPGA 芯片相當于一個硬件電路，無需調用程序，不會出現程序跑飛的情況。此外FPGA 抗干擾能力遠遠高于傳統(tǒng)的DSP。
◇ 控制器與AB-APF 模塊之間采用CAN 傳輸數據
AB-APF 有源電力濾波器與功率單元之間采用CAN 連接。具有實時性強，采用雙線串行通信方式，檢錯能力強，可在高噪聲干擾環(huán)境中工作?？煽康腻e誤處理和檢錯機制，發(fā)送的信息遭到破壞后，可自動重發(fā)。
◇ 噪音低，滿載運行時噪音低于65db
AB-APF 有源電力濾波器采用軟磁材料，鐵硅電感流過電流時幾乎沒有聲音，AB-APF 在滿載時，噪音低于65db。
◇ 獨有的并機方式與優(yōu)越的均流效果
AB-APF 有源電力濾波器并機，只有一個FPGA 控制器，不存在每個AB-APF 模塊內部的電壓采樣電阻、微電流互感器、電流采樣電阻的精度偏差，AB-APF 模塊之間能很好的均流，不存在環(huán)流。
◇ 在任何負載情況下，補償后的系統(tǒng)電流THD i<3%
AB-APF 有源電力濾波器的濾波能力，在任何負載情況下，補償后的系統(tǒng)電流THDi<3%；電感上的開關頻率為21.6KHz，補償諧波次數為2~50 次。
◇ 開環(huán)控制與閉環(huán)控制相結合的控制方式
AB-APF 有源電力濾波器結合開環(huán)和閉環(huán)控制的優(yōu)點：系統(tǒng)電流采樣經過FFT 運算分解后，采用開環(huán)控制與閉環(huán)控制相結合的方法，補償無功APF 采取開環(huán)控制，響應速度快；補償諧波APF 采用閉環(huán)控制，補償精度高。
◇ 良好的限幅能力
AB-APF 有源電力濾波器單次諧波都可限幅，可與無源法濾波器治理同次諧波。
◇ 三電平主電流拓撲
在相同的直流母線電壓下，AB-APF 有源電力濾波器產生的沖擊電壓(dv/dt) 為第一AB-APF 的一半，第二代APF 降低了每個IGBT 的開關應力和開關損耗，IGBT 更可靠。
Modular, building block type parallel structure for easy expansion
The AB-APF active power filter is a building block expansion type parallel structure: each electrical component in the main circuit is miniaturized and standardized, and the whole topology is encapsulated in a module. the AB-APF module is connected to the ABAPF cabinet by dynamic plug-in, and the user can push the AB-APF module into the AB-APF cabinet and plug in the CAN interface when expanding capacity.
◇ Convenient maintenance, support for online maintenance
AB-APF active power filter adopts modular design, any damage to one electrical component will only affect the operation of the current module, while other modules in the AB-APF cabinet operate normally and will not lead to the paralysis of the whole AB-APF. When maintenance, you only need to pull out the faulty AB-APF module from the cabinet and replace it with a new AB-APF module.
◇ High reliability and uniform humidity
AB-APF active power filter miniaturizes heat generating components such as: IGBT in the inverter unit, filter inductor and damping resistor in the LCL filter, and power is reduced. Moreover, the heat generating components are evenly distributed to each filter module, so that the heat is uniform. Electrical components are less likely to fail due to high humidity.
◇ Construction of control system by pure FPGA
AB-APF active power filter control system adopts military-grade FPGA chip, which integrates 84 hardware DSP units inside the chip, and the computing ability is far greater than that of a single DSP. After burning the program, the whole FPGA chip is equivalent to a hardware circuit, and there is no need to call the program, so the program will not run away. Besides, the anti-interference ability of
FPGA is much higher than that of traditional DSP.
◇ CAN data transmission between controller and AB-APF module
CAN connection is adopted between AB-APF active power filter and power unit. With high real-time, two-wire serial communication, strong error detection capability, and can work in high noise and interference environment. Reliable error handling and error detection mechanism, and the sent information can be automatically resent after being damaged.
◇ Low noise, less than 65db at full load operation
AB-APF active power filter adopts soft magnetic material, and there is almost no sound when the iron-silicon inductor flows through the current, AB-APF has less than 65db noise at full load.
◇ Unique parallel mode and superior current equalization effect
The AB-APF active power filter is parallelized with only one FPGA controller, and there is no deviation in the accuracy of voltage sampling resistor, micro current transformer and current sampling resistor inside each AB-APF module, and the AB-APF modules can equalize the current well with each other, and there is no loop current.
◇ The compensated system current THD i<3% under any load condition
The filtering capability of AB-APF active power filter, the system current THDi<3% after compensation under any load condition; the switching frequency on the inductor is 21.6KHz, and the number of compensated harmonics is 2~50 times.
◇ Combination of open-loop control and closed-loop control
AB-APF active power filter combines the advantages of open-loop and closed-loop control: after the system current sampling is decomposed by FFT operation, the combination of open-loop control and closed-loop control is adopted, and the APF for compensating reactive power takes open-loop control with fast response; the APF for compensating harmonics takes closed-loop control with high compensation accuracy.
◇ Good limiting capability
AB-APF active power filter can limit all single harmonics, and can govern the same harmonics with passive method filter.
Three-level main current topology
Under the same DC bus voltage, the inrush voltage (dv/dt) generated by AB-APF active power filter is half of the first AB -APF. The second generation APF reduces the switching stress and switching loss of each IGBT, and the IGBT is more reliable.
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