Photovoltaic System Simulating Synchronous Generator Characteristics
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Solution Overview
Problem
Conventional photovoltaic systems lack the power generator characteristics necessary for stable operation, frequency maintenance, and voltage stability when integrated with synchronous power generators, as they do not include rotating parts, speed governors, or excitation systems.
Innovation Solution
A photovoltaic system and power supply system that store power generator characteristics, measure system data, set operation targets, and calculate output targets to supply power adapted to the power system, using a photovoltaic section with solar cells, storage cells, and power converters to mimic synchronous power generator behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photovoltaic systems are introduced in large amount to achieve zero emission power supply, then environmental benefit is improved, but system stability and frequency maintenance capability deteriorate due to lack of power generator characteristics
Solution Approach 1:
The patent applies the copying principle by creating a control system that replicates the essential characteristics of synchronous power generators in photovoltaic systems. The control unit simulates the behavior of rotating parts, speed governors, and excitation systems through software algorithms, enabling PV systems to exhibit power generator characteristics without physical rotating components. This allows PV systems to maintain frequency and voltage stability while contributing to zero emission power supply.
Solution Approach 2:
The patent replaces mechanical systems with electronic control systems. Instead of using actual rotating parts, speed governors, and excitation systems, the invention uses a control unit that calculates and adjusts output based on simulated power generator characteristics. This substitution eliminates mechanical complexity while achieving the same functional outcomes for system stability and frequency maintenance.
2Device complexity
If conventional photovoltaic systems convert DC to AC output without speed governing or excitation systems, then device complexity is reduced, but ability to maintain frequency and voltage stability deteriorates
Solution Approach 1:
The control unit copies the functional behavior of speed governors and excitation systems through computational algorithms. It calculates reference values for active and reactive power output based on simulated power generator characteristics, enabling frequency and voltage stability maintenance without physical mechanical components.
Solution Approach 2:
The patent substitutes mechanical speed governing and excitation systems with electronic control mechanisms. The control unit uses mathematical models to simulate the dynamic response of synchronous generators, replacing physical rotating machinery with software-based control that achieves the same stability functions.
3Ease of manufacture
If photovoltaic systems lack speed governing and excitation systems, then ease of manufacture is improved, but cooperative operation with synchronous power generators deteriorates
Solution Approach 1:
The control unit provides universal functionality by simulating multiple power generator characteristics (speed governing, excitation control, synchronizing power) within a single device. This enables photovoltaic systems to cooperatively operate with synchronous power generators across various operating conditions without requiring separate mechanical systems for each function.
Solution Approach 2:
The control system copies the cooperative behavior characteristics of synchronous power generators, enabling PV systems to participate in grid operations with the same stability and coordination properties as traditional generators, thereby improving adaptability for cooperative operation.
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
Enables stable operation, frequency maintenance, and voltage stability by simulating synchronous power generator characteristics, allowing photovoltaic systems to cooperate effectively with existing synchronous power generators.
Implementation Method 1
a photovoltaic solar cell, a storage cell, and a power converter configured to convert an electric energy output from the photovoltaic solar cell and the storage cell
Data Source
AI summary
According to one embodiment, the photovoltaic system includes a memory configured to store power generator characteristics to be applied to the photovoltaic system, a calculation section configured to calculate an output target value to be output by the photovoltaic system using the power generator characteristics read from the memory, an operation target value, system data of a power system, and output data from the photovoltaic system to the power system, and a photovoltaic section configured to supply a corresponding power to the power system based on the output target value calculated by the calculation section.