The control of voltage in the operating systemvoltage is to arrange and fully utilize the reactive power compensation capacity and regulation capability in the power grid, to keep the voltage values at various key points in the power grid within specified limits during normal operation and after fault conditions, and to ensure the safe and stable operation of the power system.
In theory, there have been many discussions on reactive power optimization in the power grid, but in practice, it is very difficult to achieve in a complex power system. There are both operational issues and several regulation principle issues that need to be clarified. For example, when operating conditions change, to maintain reactive power optimization in the system, according to the characteristics of reactive power and voltage distribution in the power grid, it is necessary to frequently operate various reactive power regulation and voltage regulation means at all points in the system. Without a highly developed power communication network and automation conditions, it is practically impossible. Another example is that, unlikefrequency regulation, the adjustment of reactive power and voltage cannot completely rely on synchronous machines and static compensators, so it is impossible to achieve uniform fine adjustment. Since a unified voltage standard for the entire grid cannot be established, only local voltage measurements can be used as the basis. These dispersed measurement errors will inevitably affect optimization, and so on. How to achieve near-optimal adjustment in actual systems is currently a research topic.
From a general concept, it can be considered that a more practical approach is to operate the voltage at various points in the system at the highest permissible level, while reserving sufficient emergency reserve for accidents. This not only benefits the stability of system operation but also achieves economic benefits close to optimization.
