Power control method and system of new energy power generation station with fast frequency response

Abstract

The invention relates to the technical field of new energy power generation control, in particular to a power control method of a new energy power generation station with fast frequency response; thepower control method comprises the following steps that (A) a control module is used for acquiring voltage, current and frequency information of a power station grid-connected point at the output endof a transformer; (B) the control module calculates an active control target value according to an active-frequency characteristic curve and frequency, and calculates a reactive control target value according to a reactive power-voltage characteristic curve and voltage information; and (C) the control module processes the two target values, and outputs a PWM control signal to adjust the active power output and the reactive power output of the power station. The invention further discloses a corresponding system. According to the requirement for rapid and automatic control on a photovoltaic power station by the power grid, the rapid frequency response function is added on the basis of controlling the group sending group control of the system; and the short circuit capacity of a grid-connected bus is detected in real time, the control parameters are adjusted, the system is prevented from being pushed and pulled, the adjusting quality is improved, and safe and stable operations of the power station and the power grid are ensured.

Description

technical field [0001] The invention relates to the technical field of new energy power generation control, in particular to a power control method and system for a new energy power station with fast frequency response. Background technique [0002] High-efficiency, clean, and renewable energy generation technologies represented by wind energy and solar energy are highly valued by countries all over the world. How to safely connect these power sources to the system needs to solve the problem of high-power, high-efficiency, and high-quality energy conversion and control. New energy power generation is of great significance to optimize the energy structure, promote energy conservation and emission reduction, and achieve sustainable economic development. [0003] As of the end of 2017, the installed capacity of new energy in my country's Northwest Power Grid has reached nearly 40% of the total capacity. It is urgent to require new energy power plants to participate in the peak...

AI Technical Summary

Problems solved by technology

It is urgent to require new energy power plants to participate in the peak regulation and voltage regulation of the power grid, otherwise the power grid will not be able to operate safely and stably

Due to the natural anti-load characteristics of photovoltaic, wind power and other new energy power stations, the active and reactive power of new energy power stations are traditionally difficult to adjust. Regulatory control, unable to respond quickly when the grid frequency and voltage are subjected to large disturbances

At the same time, in the control of the new energy power station of the multi-machine system, due to the difference in electrical distance and the inconsistency of control performance, the adjustment process is prone to push-pull oscillations, which affects system safety.

Especially for reactive power, it generally only relies on the dynamic reactive power compensation device SVG configured according to 20% of the installed capacity, so it is far from meeting the requirements of fast and accurate response to the power grid that often suffers from dynamic disturbances

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