Control method, experiment method and simulation method for improving new energy grid-connected stability

Abstract

The invention belongs to the technical field of new energy grid-connected power generation, and particularly relates to a control method, experiment method and simulation method for improving the new energy grid-connected stability. A generator is driven by new energy through a motor, the voltage phase relationship between the motor and the generator and the relationship between active power and motor parameters are analyzed, power angles are calculated and active power transmission is controlled through a source network phase difference method. The new energy and a power grid are simulated through a frequency converter and a four-quadrant programmable power supply, the phase of output voltage of the frequency converter is adjusted after grid-connected stable operation, the active power transmission quantity is measured until a rated value and a transmission power change of the motor is observed. A new energy side is simulated by an adjustable phase inverter power supply; a power grid side is an infinite power supply; and automatic excitation is adopted, an active transmission instruction of the inverter power supply is changed when the system stably runs, and the changes of active transmission, a rotating speed and a source network phase difference are observed. By the methods, the rotary inertia of the high-permeability new energy power grid can be effectively improved and the stability of the power grid is strengthened.

Description

technical field [0001] The invention belongs to the technical field of new energy grid-connected power generation, and in particular relates to a control, experiment and simulation method for improving the stability of new energy grid-connected. Background technique [0002] Facing the dual pressure of energy crisis and environmental pollution, the development and utilization of renewable energy to optimize and adjust the energy structure will become the direction to promote the sustainable development of global energy-economy-environment. In recent years, wind power has maintained the status of the world's fastest growing energy source. At present, my country's total installed capacity of wind power ranks first in the world, and wind power will become one of China's five major power sources. However, as the installed capacity of wind power continues to increase, the problem of unbalanced development of the wind power industry has gradually emerged. The centralized developm...

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Problems solved by technology

However, at present, variable-speed wind turbines based on power electronic converters connected to the grid do not have the ability to inertial and damp system power oscillations. After large-scale penetration into the grid, the inertia and damping of the system will be reduced, and the stability of the power system will be further aggravated. sexual problems

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