Power Converter Control Using Multi-Generator Inertia Simulation
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Solution Overview
Problem
The stability of power grids is compromised due to the decreasing proportion of synchronous power generators, which leads to reduced inertia energy and increased frequency changes during load abrupt changes. Existing technologies, such as virtual synchronous machine control, do not effectively simulate the characteristics of multiple synchronous generators.
Innovation Solution
A power conversion device equipped with a power converter and a control device that simulates the characteristics of multiple synchronous generators. The control device includes a generator simulating unit that generates voltage command values by adding simulated command values from multiple synchronous generators, thereby mimicking their combined behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the proportion of synchronous power generators connected to the power grid decreases, then more distributed power sources can be connected to the power grid, but the inertia energy in the power grid decreases and frequency change increases
Solution Approach 1:
The invention creates a virtual copy of synchronous generator characteristics through control devices that simulate the electrical and mechanical behavior of actual synchronous generators. The control device calculates virtual inertia values and generates control signals that replicate the inertial response and frequency regulation characteristics of physical synchronous generators, allowing distributed power sources to provide synthetic inertia without requiring actual rotating mass.
2Reliability
If virtual synchronous machine control is used to simulate synchronous generator behavior, then inertia energy can be made up for, but the characteristics of multiple synchronous generators cannot be effectively simulated
Solution Approach 1:
The invention divides the simulation of multiple synchronous generators into separate functional units, where each unit is responsible for simulating the characteristics of one specific synchronous generator. The control device includes multiple simulation units that can independently calculate and generate control signals for different generator models, allowing each generator's unique characteristics (inertia constants, damping coefficients, control parameters) to be individually simulated and then combined.
3Ease of operation
If a single virtual synchronous machine control is implemented, then control simplicity is maintained, but the ability to simulate multiple synchronous generator characteristics is limited
Solution Approach 1:
The control device is designed with a universal architecture that can handle multiple synchronous generator simulations through a standardized framework. Each simulation unit follows the same structural pattern and control algorithm, allowing the system to simulate any number of generators with different characteristics using a consistent methodology. This modular universal design maintains operational simplicity while enabling versatile multi-generator simulation capabilities.
Data Source
AI summary
A power conversion device includes a power converter connected to a power storage element, and a control device. The control device includes a generator simulating unit to generate a voltage command value, and a signal generating unit to generate a control signal for the power converter based on the voltage command value. The generator simulating unit includes a first characteristics simulating unit to generate a first command value by simulating characteristics of a first synchronous generator, a second characteristics simulating unit to generate a second command value by simulating characteristics of a second synchronous generator different from the characteristics of the first synchronous generator, an adder to perform addition of the first command value and the second command value, and a voltage command generating unit to generate the voltage command value, based on an addition result of the first command value and the second command value.