A control strategy for power plant microgrid based on multi-level control

Abstract

The invention discloses a multi-level control-based microgrid control strategy for power plants, including: primary control, secondary control, and tertiary control; the primary control is droop control, and the control time period is set at the microsecond level , distribute power to multiple DG units by adjusting the impedance phase angle, so as to stabilize the voltage and frequency of the microgrid; the secondary control is no-difference control, and the control time period is set to the minute level. By adjusting the voltage and battery status The control signal of the variable is modulated by the inertial calculation controller, and the compensation variable is calculated and fed back to the primary control to restore the voltage and frequency of the microgrid; the tertiary control is optimal control, and the control time period is set at the hour level. Using the distribution network power flow calculation method, the minimum power generation cost and minimum network loss of the microgrid are calculated, and the economic operation of the microgrid is optimized. The invention can improve the operation stability and economy of the micro grid.

Description

technical field [0001] The invention relates to the technical field of micro-grids, in particular to a multi-level control-based micro-grid control strategy for power plants. Background technique [0002] Smart microgrid is the best solution for system integration of distributed generation (Distributed Generation, DG), distributed storage (Distributed Storage, DS), and distributed loads (Dispersed Loads, DL). Under the centralized power supply system of the large power grid, large power plants are usually far away from the load center, so large-capacity and long-distance power transmission is required. However, these small-capacity micro-grids can realize power generation and energy storage nearby at the load end, thereby saving a large number of transmission and distribution lines and the resulting transmission and distribution losses. In general, the traditional centralized power supply and distribution mode has many defects: too much line loss leads to low system efficie...

AI Technical Summary

Problems solved by technology

In general, the traditional centralized power supply and distribution mode has many defects: too much line loss leads to low system efficiency, the capacity rise effect of high-voltage long-distance transmission lines leads to poor voltage stability, multiple single-point failures and other occasional Network failures lead to low reliability

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