Fire-storage AGC frequency modulation control method by considering flexible load characteristics

A flexible load and control method technology, applied in flexible AC transmission systems, AC network load balancing, and AC network flicker reduction, etc., can solve problems such as low power and limited system frequency recovery.

CN111614108AActive Publication Date: 2020-09-01NORTHEAST DIANLI UNIVERSITY +1
6 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-09-01

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a fire-storage AGC frequency modulation control method by considering flexible load characteristics. The method is characterized in that partition control is carried out on theoperation of each frequency modulation resource, the operation constraint of a battery energy storage system and the centralized control constraint of a flexible load are designed from the perspective of source-load interaction, and the real-time condition of the system is accurately and reasonably adjusted based on frequency deviation partition; the power supply side smoothes the output of the unit by utilizing the rapid adjustment characteristic of the battery energy storage system, and restrains the charging and discharging depth by adopting a linear regression function; the load side relieves the frequency regulation pressure by utilizing the flexible scheduling characteristic of the flexible load, and depicts the constraint of the controllable output by adopting centralized control;partitioning is carried out according to different degrees of frequency deviation, and different regulation and control means are adopted in different areas to accurately respond to different states of the system. The frequency modulation performance of the system can be improved, the energy storage output condition is optimized, and the energy storage life loss is reduced.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of secondary frequency regulation of energy storage auxiliary thermal power units, and is a fire-storage AGC frequency regulation control method considering flexible load characteristics. Background technique

[0002] With the integration of large-scale renewable energy into the grid, its volatility and power decoupling characteristics make it impossible for renewable energy units to provide sufficient frequency regulation reserve capacity. Due to the long start-up time of traditional thermal power units and the slow climbing speed of the units, they cannot quickly respond to system frequency regulation. Therefore, it is necessary to find an adjustment method that can solve the problem of rapid frequency change of the power system after large-scale renewable energy is connected to the grid to adjust the frequency of the system. In the previous studies, when the energy storage auxiliary thermal power unit was only use...

Examples

Embodiment Construction

[0077] A fire-storage AGC frequency modulation control method in consideration of flexible load characteristics of the present invention will be further described below using the accompanying drawings and embodiments.

[0078] The present invention proposes a fire-storage AGC frequency modulation control method that considers the characteristics of the flexible load. The purpose is that when the energy storage is at the extreme value of the state of charge and the output is insufficient, the frequency can be assisted by the participation of the flexible load. Specifically, Include the following:

[0079] 1) Restrictions on the operating depth of the battery energy storage system

[0080] When the energy storage operation time is t, the energy storage operation control constraints are:

[0081] SOC min ≤SOC t ≤SOC max (1)

[0082] In the formula, SOC min 、SOC t 、SOC max Respectively represent the minimum value, the value at time t, and the maximum value of the energy s...