無効電力補償のヒント

電力網の負荷が電気モーターや溶接機などの誘導性である場合、電力網の電流は電圧よりある角度だけ遅れます。過補償状態など、負荷が容量性である場合、電力網の電流は電圧よりもある角度だけ進みます。力率の進みまたは遅れは、電流と電圧の間の位相関係を指します。補償装置のコントローラは、力率、無効電流、無効電力などのコンデンサのスイッチングを決定するために、電源システムの物理量を検出します。
Below is an example of power factor type. When this physical quantity meets the requirements, such as cos Φ leading and>0.98, lagging and>0.95、この範囲内では、コントローラーは制御信号を送信せず、動作中のコンデンサ バンクは終了せず、動作していないコンデンサ バンクも終了しません。 cosΦの遅れや、cosΦの遅れなど、cosΦが要件を満たさない場合<0.95, a set of capacitors will be put into operation, and if cos Φ still does not meet the requirements, the controller will delay for a period of time (the delay time can be set), and then another set of capacitors will be put into operation until all capacitors are put into operation. When a leading signal such as cos Φ<0.98 is detected, indicating a capacitive load, the controller will cut off the capacitor banks one by one. The principle to follow is that the first capacitor bank to be put into operation must be cut off before being cut off. If the delay time is set to 300s and this compensation device has ten capacitor banks, then the total input time is 5 minutes, and the same goes for cutting off. During this period, reactive power loss compensation can only be gradually implemented. If the delay time is set very short or not set, this situation may occur. When the controller detects cos Φ<0.95, it quickly turns on the capacitor banks one by one. During the input period, the power grid may already be a capacitive load, which is overcompensated. The controller then controls the capacitor banks to be cut off one by one, repeating the cycle and causing oscillation, leading to system collapse. Whether oscillation can be formed is closely related to the nature of the load, so this parameter needs to be adjusted according to the on-site situation, and the compensation effect should be considered while ensuring system safety.