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Frequency oscillation control method and system for water-light complementary system under off-grid condition

A frequency oscillation, water-light complementary technology, applied in the direction of reducing/preventing power oscillation, photovoltaic power generation, electrical components, etc.

Active Publication Date: 2020-12-29
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the current research on water-light hybrid systems is in its infancy, and there is no similar technical means to refer to

Method used

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  • Frequency oscillation control method and system for water-light complementary system under off-grid condition
  • Frequency oscillation control method and system for water-light complementary system under off-grid condition
  • Frequency oscillation control method and system for water-light complementary system under off-grid condition

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Embodiment 1

[0047] This example proposes a frequency oscillation control method for a water-photovoltaic complementary system under off-grid conditions. According to the output status and adjustable capacity of photovoltaics, the complementarity of hydropower and photovoltaics is realized at the real-time control level. On the premise of realizing frequency oscillation damping suppression Improve the system frequency stability level as much as possible, and improve the system frequency modulation capability.

[0048] Specific as figure 1 As shown, the method of the present embodiment includes the following steps:

[0049] Step 1. Obtain the system photovoltaic output level and dispatch adjustment instructions in real time, and then determine the photovoltaic adjustable capacity.

[0050] Step 2. Select different frequency oscillation suppression schemes according to the photovoltaic adjustable capacity.

[0051] Step 2 of this embodiment specifically includes:

[0052] 1) During the da...

Embodiment 2

[0063] This embodiment proposes a frequency oscillation control system under the off-grid condition of the water-light complementary system, specifically as image 3 As shown, the system of this embodiment includes a photovoltaic adjustable capacity determination module and a switching module.

[0064] The photovoltaic adjustable capacity determination module of this embodiment is used to obtain the system photovoltaic output level and dispatch adjustment instructions in real time to determine the photovoltaic adjustable capacity;

[0065] The switching module of this embodiment is used to select different frequency oscillation suppression schemes according to the photovoltaic adjustable capacity.

[0066] The switching module of this embodiment includes a first judging unit, a second judging unit and a third judging unit;

[0067] The first judging unit is used to switch the speed governor to control mode 1 when P0>=P1, switch on the photovoltaic additional damping controlle...

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Abstract

The invention discloses a frequency oscillation control method and system for a water-light complementary system under an off-grid condition. The method comprises the steps: obtaining a photovoltaic output level and a scheduling adjustment instruction of a system in real time, and determining the photovoltaic adjustable capacity; and selecting different frequency oscillation suppression schemes according to the photovoltaic adjustable capacity. According to the photovoltaic output condition and the adjustable capacity, complementation of water and electricity and photovoltaic is achieved on the real-time control level, the frequency stability level of the system is improved as much as possible on the premise that frequency oscillation damping suppression is achieved, and the frequency modulation capacity of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability control, and in particular relates to a frequency oscillation control method and system under the off-grid condition of a water-light complementary system. Background technique [0002] Hydropower itself is a high-quality and adjustable renewable energy. It has many advantages such as adjustable reservoir storage capacity, flexible start and stop, and quick adjustment of power generation output. It is an important link to realize multi-energy complementary power generation. Fully tap hydropower and wind power. , Photovoltaic direct complementary characteristics, it is of great theoretical and practical significance to carry out research on complementary power generation technology related to hydropower. [0003] The water-photovoltaic hybrid system uses hydropower and photovoltaic complementary joint power generation, and utilizes the good regulation performance of hydrop...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/241H02J3/381H02J2300/22Y02E10/56
Inventor 陈刚丁理杰王亮韩晓言魏巍苗树敏范成围
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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