The voltage in the power system is closely related to the status of reactive power in the system. Changes in the power system, especially changes in reactive power, will cause voltage losses in the power lines and transformers to change, and cause changes in the voltage at each node. With the increasing installation capacity of power systems and the apparent lag in network construction, the losses of distribution networks below 10 KV gradually increase.
Reactive power compensation is an effective condition for boosting and reducing losses of a 10KV power distribution network. Compared with other measures (such as reconfiguring the power distribution network, replacing the high-loss transformer, increasing the conductor cross section, and shortening the power supply radius, etc.), no The compensation for work is minimal and the effect is significant, and the cost can be recovered in a short period of time (a year or so).
At present, in terms of power, there are mainly the following methods for reactive power compensation:
1. High-voltage power grid centralized compensation
2. On-site compensation for low-voltage power grids
3, adjust the excitation compensation of synchronous motor. The application of the above compensation method satisfies the requirements of the power supply department for the power factor of the enterprise, and seldom considers how to reduce the power loss within the enterprise. Therefore, they all have the following advantages and disadvantages:
1) Less investment, even if it meets the requirements of power bureaus for power factor, a large number of high-voltage power distribution lines within the company, distribution transformers and low-voltage distribution lines of each workshop substation are not compensated, and most of them are successful. Electric energy becomes loss and line loss consumption.
2) Low-voltage centralized compensation Although the investment is small, while satisfying the power company's requirements for power factor, it can also compensate for a part of line loss and transformation loss, but the capacitor can't be instantly switched along with the load change, sometimes it can cause partial line over-compensation. (The power factor COSΦ>1) instead hits the grid, and a large number of low-voltage grids still cannot be completely compensated.
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