MGP Grid-Connected Control With DC Voltage Feedback
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Solution Overview
Problem
The fluctuating and uncontrollable nature of new energy power generation poses challenges for motor-generator pairs (MGP) in grid-connected control, leading to output delays and instability in the control system if power predictions are inaccurate.
Innovation Solution
A method and system for MGP new energy grid-connected control that integrates the operating characteristics of P-V panels or wind turbines with frequency converters and DC capacitors, allowing for real-time voltage and power adjustments to stabilize the grid connection, using voltage feedback control to maintain stable DC voltage and synchronize power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power prediction is used for MGP grid-connected control, then the control system can handle new energy fluctuations, but output delay occurs in the control system
Solution Approach 1:
The patent implements preliminary action by predicting new energy power output in advance and pre-adjusting the MGP operating state before power fluctuations occur. The control system predicts future power output based on historical data and environmental factors, then proactively adjusts the motor-generator pair's speed and power transmission ratio to prepare for upcoming fluctuations, eliminating the need for reactive delays.
Solution Approach 2:
The patent applies dynamics by making the MGP system continuously adaptable through real-time adjustment of operating parameters. The system dynamically modifies the motor-generator pair's speed ratio and power transmission characteristics based on predicted new energy output, enabling the control system to respond instantly to power fluctuations without fixed delays associated with traditional feedback control.
2Adaptability or versatility
If power prediction is used for MGP grid-connected control, then the control system can handle new energy fluctuations, but stability and reliability are affected if prediction is not accurate
Solution Approach 1:
The patent implements feedback by continuously monitoring actual new energy power output and comparing it with predicted values. The control system uses this feedback information to correct prediction errors and adjust the MGP operating state in real-time, ensuring that even if initial predictions are inaccurate, the system can adapt and maintain stable grid-connected operation through continuous error correction.
Solution Approach 2:
The patent applies dynamics by enabling the MGP system to continuously adapt its operating characteristics based on real-time power fluctuation data. The system dynamically adjusts the motor-generator pair's speed ratio and power transmission to match actual new energy output, allowing the control system to maintain reliability while tracking power fluctuations regardless of initial prediction accuracy.
3Ease of operation
If traditional thermal power unit control is used, then output power can be controlled at any time, but it cannot accommodate the fluctuating nature of new energy generation
Solution Approach 1:
The patent applies universality by designing the MGP system to perform multiple functions: it can control power output like traditional thermal units while simultaneously accommodating the fluctuating nature of new energy generation. The motor-generator pair serves dual purposes - maintaining grid stability through controllable power transmission and adapting to variable renewable energy input, making the system versatile enough to handle both deterministic and stochastic power sources.
Solution Approach 2:
The patent applies dynamics by making the MGP system continuously adaptable to different operating conditions. Unlike fixed thermal power units, the system dynamically adjusts its power transmission characteristics based on real-time new energy output, enabling it to accommodate fluctuating renewable energy while maintaining controllable power delivery to the grid through real-time parameter optimization.
Data Source
AI summary
The invention discloses a method for MGP new energy grid-connected control, wherein, the synchronous motor is connected to a synchronous generator; the new energy module drives the synchronous motor to rotate through a frequency converter; the frequency converter controls the power transmission; and the synchronous motor drives the synchronous generator for grid connection. The present invention has the beneficial effects that: the control method and system provided by the invention can improve the stability and reliability of the grid.