电力系统的无功功率和电压调整（Reactive power and voltage adjustment of power system）.docVIP

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电力系统的无功功率和电压调整（Reactive power and voltage adjustment of power system）.doc

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电力系统的无功功率和电压调整（Reactive power and voltage adjustment of power system）

电力系统的无功功率和电压调整（Reactive power and voltage adjustment of power system） Reactive power and voltage adjustment of power system 1. Reactive power load and reactive power loss Reactive load: most of it is asynchronous motor Loss of power: 1. Transformer; 2. Transmission lines. The reactive power loss in the transformer is divided into two parts: the excitation feeder loss and the winding leakage resistance. In this case, the 100-point value of the excitation branch loss is basically equal to the 100 points of the no-load current. When the transformer is fully loaded, it is basically equivalent to the short circuit voltage. Therefore, the reactive power loss in transformer is not large for the network of a transformer or first-level transformer, which is about 10% of its rated capacity when fully loaded. But for multistage voltage network, the reactive power loss in transformer is considerable. The reactive power loss in the power line is also divided into two parts, namely the parallel admittance and the reactive power loss in series reactance. This loss in the combined power is also known as charging power, which is proportional to the square of the line voltage, and it is capacitive. The loss in series reactance is proportional to the square of the load current. As a result, the circuit as a component in the power system is not sure of the capacity of the capacity or the inductive power. But it can be estimated that the active power transmitted through the line is greater than the natural power (the power that is consumed by the load impedance when the load impedance is the wave impedance). In time, the line will consume the reactive power; When the active power is less than the natural power, the line will consume the capacity of reactive power. The reactive power supply in the power grid 1. The generator Synchronous generator is both active power supply and basic reactive power supply. 2. Capacitor and camera The shunt capacitor can only supply the system with induct