MGP Power Feedback Control for Fast Grid Frequency Regulation
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Solution Overview
Problem
The integration of new energy sources like photovoltaic and wind power into the grid leads to instability due to fluctuating power output, lack of inertial response, low frequency tolerance, insufficient transient voltage and current support, and new oscillation problems, necessitating an improved control method for Microgrid Power (MGP) systems.
Innovation Solution
A power feedback control system for MGP systems, comprising a measurement calculation module, a PI regulator module, and a regulation module, which detects actual active power, calculates frequency regulation, and fine-tunes the frequency converter to adjust phase differences through frequency modulation, thereby controlling power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power feedback control is implemented by predicting new energy output power, then power control accuracy is improved, but system response delay increases and stability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationship between grid frequency deviations and required active power adjustments. When frequency deviation occurs, the controller directly retrieves the pre-determined power adjustment value without performing real-time prediction calculations, thus eliminating system response delay while maintaining accurate power control.
Solution Approach 2:
The patent implements feedback by continuously monitoring grid frequency and using the frequency deviation as direct input to determine active power adjustment. The closed-loop feedback mechanism ensures that power control accuracy is maintained by constantly comparing actual frequency with reference frequency and adjusting power output accordingly, without requiring predictive modeling that would introduce delays.
2Adaptability or versatility
If new energy converters replace synchronous generators, then new energy integration is improved, but grid stability and frequency tolerance deteriorate
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the control parameters of new energy converters based on grid frequency conditions. The controller modifies active power output parameters in response to frequency deviations, enabling new energy converters to provide frequency regulation support similar to synchronous generators, thus maintaining grid stability while preserving high new energy integration capability.
Solution Approach 2:
The patent introduces an active power control system as an intermediary between new energy converters and the grid. This intermediary layer provides frequency regulation services by adjusting active power output based on grid frequency conditions, enabling new energy converters to indirectly support grid stability without requiring synchronous generator characteristics.
3Productivity
If active power is adjusted to follow new energy fluctuations, then new energy utilization is improved, but system complexity increases
Solution Approach 1:
The patent applies self-service by enabling the active power control system to automatically respond to new energy fluctuations without requiring complex external control mechanisms. The controller autonomously monitors new energy output and grid frequency conditions, and independently determines the required active power adjustments, simplifying the overall control architecture while maximizing new energy utilization.
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 proposed system enhances the stability and reliability of new energy grids by eliminating output delays and ensuring accurate power control, thus facilitating the integration of new energy sources into the grid.
Implementation Method 1
a PI regulator module, used to work out the frequency regulation amount based on the difference obtained and used as feedback
Implementation Method 2
an regulator module, used for fine tuning of the frequency converter according to a frequency reference value of the frequency converter calculated in a control system and adjust the phase difference by frequency modulation
Data Source
AI summary
The invention discloses a power feedback control system and method of MGP system, including detecting the actual active power sent by the generator to the grid through the measurement and calculation module; making a difference between the measured active power and the given active power; calculating frequency regulation amount through the PI regulation module according to the difference, and taking it as feedback; calculating the frequency reference value of the converter in the control system; through the adjustment module adjusts finely the frequency of the converter and adjust the phase difference of frequency modulation to achieve controlling power output, so when the new energy predicts its output power based on power feedback control using MGP before connecting to grid, the output of the control system will not delay and affect the stability and reliability of the control system, ensuring the smooth introduction of new energy grid-connected methods.