The math model of cascaded H-bridge static synchronous compensators (STATCOM) of star configuration is described firstly in this paper. Based on the math model, an advanced control method is proposed, in which all control variables are dc, which are suitable for getting no steady-state errors using simple PI controllers. The simulation results demonstrate the validity of this method, and the experiment results are specially presented to verify the fast response under dynamic process.

The paper summarizes the construction mode of distribution network automation system, and sorts out the operating characteristics of centralized intelligent mode and distributed intelligent mode. In view of the construction and operation of China’s distribution network automation system, point out common problems in system construction, operation and management in most regions. At the same time, the paper proposes the optimization of distribution network automation technology based on the gravity search algorithm, and improves the algorithm. Finally, the improved gravity search algorithm is applied to the IEEE 6-node power system. The calculation results show that the active power loss and voltage obtained by the algorithm are Compared with the original state, the level has been greatly improved, which greatly improves the automation efficiency of the power system. In this paper, the gravity search algorithm is used to calculate the optimization of power system automation technology, and the algorithm is improved, which overcomes the shortcoming of easy convergence to the local optimum.

The introduction of intelligent substation process layer network has caused great changes in the data source and transmission method of relay protection, and its action performance and reliability are increasingly dependent on the communication network. The data flow of the relay protection in the intelligent substation and the communication mechanism of each message are analysed. Based on the IEC61850 standard, the process layer network and the relay protection IED device are modelled on the OPNET simulation software to realize the MU of the relay protection in the intelligent substation the whole process simulation of data collection, SV message, GOOSE message, protection algorithm and protection export. Combined with the example of current protection, the principle and realization mechanism of modelling and simulation are explained, and its feasibility and effectiveness are verified, which provides a new effective research tool for the quantitative analysis of relay protection in smart substations.

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With the continuous development of the scale of the power grid and the advancement of the integrated mode of regulation and control, the amount of real-time monitoring information in the power grid system has grown rapidly today, which has imposed a great burden on all levels of dispatch monitoring. The old alarm function of the power dispatching automation system has been unable to better meet the needs of efficient monitoring. Therefore, it is necessary to brush, analyse, process and summarize the alarm information of each link in the monitoring business, so as to improve the overall operation status of the power grid. Awareness and processing speed of abnormal faults. Based on this, this paper discusses and studies the smart alarms of the smart grid, analyses the overall architecture, and analyses several smart alarm technologies used in the smart grid system on this basis, with a view to the subsequent development of smart grids and alarms the technical research provides a theoretical reference.