Wind-Solar-Storage Grid Connection With Inertia and Frequency Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wind and solar power generation systems face challenges in grid stability due to inherent volatility, lack of active power reserve, and weak disturbance immunity, leading to potential chain outages and instability in frequency control.
Innovation Solution
A synchronous grid-connected wind-solar-storage hybrid power generation system with energy storage devices and rotating devices to stabilize output fluctuations, enhance active power reserve, and improve inertia response and frequency regulation, using a synchronous grid connection mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If wind power and photovoltaic power are used to connect to the power grid, then renewable energy generation is increased, but grid frequency stability control becomes more difficult
Solution Approach 1:
The patent introduces a synchronous condenser as an intermediary device between the renewable energy sources and the power grid. The synchronous condenser provides inertial response and primary frequency regulation capabilities, acting as a mediator that enables renewable energy integration while maintaining grid frequency stability through its rotating mass and synchronous operation with the grid.
Solution Approach 2:
The patent changes the operational parameters of the hybrid power generation system by incorporating a synchronous condenser that can dynamically adjust its reactive power output and inertial response characteristics. This parameter change enables the system to provide frequency stability support while maintaining high renewable energy penetration.
2Productivity
If wind power and photovoltaic power operate in maximum power tracking mode, then energy capture is maximized, but active power reserve is reduced
Solution Approach 1:
The patent implements preliminary action by having the synchronous condenser pre-position rotational kinetic energy and active power reserve before disturbances occur. The synchronous condenser operates in advance to build up speed and energy reserves, enabling it to respond immediately to grid frequency deviations without waiting for power electronics converters to react.
Solution Approach 2:
The patent introduces dynamics by using the rotating mass of the synchronous condenser to provide inertial response. The dynamic characteristics of the rotating devices allow the system to automatically respond to frequency changes through centrifugal force and electromagnetic torque, providing real-time active power adjustment without electronic control delays.
3Ease of operation
If power electronic grid-connected devices are used, then grid connection is achieved, but inertial response and primary frequency regulation are lost
Solution Approach 1:
The patent merges power electronic grid-connected devices with synchronous generation technology in a hybrid configuration. The wind power and photovoltaic power generation systems are connected through power electronics for ease of connection, while the synchronous condenser is directly connected to provide inertial response and primary frequency regulation, combining the advantages of both technologies.
Solution Approach 2:
The synchronous condenser performs multiple functions simultaneously: it provides grid connection support, inertial response, primary frequency regulation, and voltage support. This multi-functionality compensates for the limitations of power electronic grid-connected devices while maintaining their ease of operation benefits.
4Stability of the object's composition
If wind-solar-storage hybrid power generation system is used, then output fluctuation is restrained, but internal moment of inertia remains small
Solution Approach 1:
The patent creates a composite system that combines energy storage devices with synchronous generation technology. The hybrid system integrates the fluctuation restraint capabilities of energy storage with the inertial properties of synchronous generators, creating a composite structure that provides both output stability and sufficient moment of inertia for frequency regulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system stabilizes output fluctuations, increases active power reserve, and enhances grid stability, reducing the likelihood of chain outages and providing effective support during disturbances, while being economically viable and suitable for mass promotion.
Implementation Method 1
a wind power generation device, and a first power electronic converter and a second power electronic converter electrically connected to the wind power generation device, respectively
Implementation Method 2
a wind power generation device, and a first power electronic converter and a second power electronic converter electrically connected to the wind power generation device
Implementation Method 3
a photovoltaic power generation device, and a third power electronic converter and a fourth power electronic converter electrically connected to the photovoltaic power generation device, respectively
Implementation Method 4
an energy storage module, comprising an energy storage device and a fifth power electronic converter electrically connected, the energy storage device is further electrically connected to the second power electronic converter and the fourth power electronic converter, respectively
Implementation Method 5
a synchronous power generation device electrically connected, the synchronous power generation device comprises a synchronous generator and an excitation unit electrically connected
Data Source
AI summary
A synchronous grid-connected wind-solar-storage hybrid power generation system and a working method thereof includes: a wind power generation module, including a wind power generation device, and a first and second power electronic converter electrically connected to the device, respectively; a photovoltaic power generation module, including a photovoltaic power generation device, and a third and fourth power electronic converter electrically connected to the device, respectively; an energy storage module, including an energy storage device and a fifth power electronic converter electrically connected, the device being further electrically connected to the second and fourth power electronic converter, respectively; a grid connection module, a first end electrically connected to the first, third and fifth power electronic converters, and a second end connected to a power grid; and, a monitoring and control device electrically connected with the wind power generation module, photovoltaic power generation module, energy storage module and grid connection module, respectively.