動態電壓恢復器（DVR）采用全控型電力電子器件IGBT，核心組成包括儲能元件（超級電容）、逆變器、充電單元切換開關及旁路開關。

其接入系統的方式獨具特點：逆變器采用并聯設計，切換開關則串聯在供電電源與受保護負載之間，形成高效的電壓保障鏈路。

當電網出現電壓暫降、暫升或短時中斷等異常情況時，DVR 會立即切斷輸入側電源，同時從自帶的儲能器件中汲取所需能量。

通過三相橋式逆變電路系統，它能快速生成與電網電壓幅值、相位完全一致的補償電壓，無縫輸送至負載端，確保輸出電壓瞬間恢復至額定值，實現負載供電零中斷，為設備穩定運行提供堅實保障。

作為儲能式電壓補償設備，其顯著優勢在于適應性極強 —— 無論單相、兩相或三相電壓跌落，即便跌落至 0%，都能有效治理，始終為負載提供合格電能，保障用電安全可靠。

動態電壓恢復器主要有四種工作狀態：

電網正常時：待機模式

此時 DVR 的晶閘管電子開關導通，負載直接由電網供電，既保證高效運行，又實時監測電網狀態。

電網異常時：補償模式

當發生電壓暫降、驟升或短時中斷，設備會快速切斷晶閘管電子開關，同步啟動IGBT 功率模塊，使負載與電網隔離，轉而由 DVR 獨立供電，實現快速響應與隔離輸出。

電網恢復穩定：恢復模式

DVR 先將輸出電壓波形與電網波形同步，隨后接通晶閘管電子開關，讓負載重新由電網直接供電；同時，系統會為儲能電容柜補充損耗的能量，整個過程柔性退出、無縫切換。

故障或檢修時：旁路模式

若 DVR 出現故障或需要技術檢修，會自動切換至旁路回路供電；待維護完成后，設備將自動恢復正常運行，體現快速旁路與自動復位的優勢。

What is Dynamic Voltage Restorer ？

The Dynamic Voltage Restorer (DVR) adopts IGBT, a fully-controlled power electronic device, with core components including energy storage elements (supercapacitors), an inverter, a charging unit changeover switch, and a bypass switch. 

Its way of connecting to the system is unique: the inverter is designed in parallel, and the changeover switch is connected in series between the power supply and the protected load, forming an efficient voltage protection link.

When the power grid has abnormal conditions such as voltage sag, swell, or short-term interruption, the DVR will immediately cut off the input-side power supply and at the same time draw the required energy from its own energy storage device.

Through the three-phase bridge inverter circuit system, it can quickly generate a compensation voltage that is completely consistent with the amplitude and phase of the grid voltage, and seamlessly transmit it to the load end, ensuring that the output voltage instantly returns to the rated value, realizing zero interruption of load power supply, and providing a solid guarantee for the stable operation of the equipment.

As an energy storage voltage compensation device, its significant advantage lies in its strong adaptability - no matter the voltage drop of single-phase, two-phase or three-phase, even if it drops to 0%, it can be effectively controlled, and it always provides qualified electric energy for the load, ensuring safe and reliable power consumption.

The Dynamic Voltage Restorer mainly has four working states:

When the power grid is normal: Standby Mode

At this time, the thyristor electronic switch of the DVR is turned on, and the load is directly powered by the power grid, which not only ensures efficient operation but also monitors the grid status in real-time.

When the power grid is abnormal: Compensation Mode

When a voltage sag, swell, or short-term interruption occurs, the device will quickly cut off the thyristor electronic switch, synchronously start the IGBT power module, isolate the load from the power grid, and then switch to independent power supply by the DVR, achieving rapid response and isolated output.

When the power grid returns to stability: Recovery Mode

The DVR first synchronizes the output voltage waveform with the grid waveform, then turns on the thyristor electronic switch to allow the load to be directly powered by the grid again; at the same time, the system will supplement the lost energy for the energy storage capacitor cabinet, and the whole process is flexibly exited and seamlessly switched.

During failure or maintenance: Bypass Mode

If the DVR fails or needs technical maintenance, it will automatically switch to the bypass circuit for power supply; after the maintenance is completed, the device will automatically resume normal operation, reflecting the advantages of fast bypass and automatic reset.