Static Energy Supply Controller Phase Shift Detection
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Solution Overview
Problem
Conventional static energy supply units struggle to provide a rapid power response similar to ac synchronous generators during sudden load changes in ac supply networks, as they rely on frequency measurements, which are slower than phase shift detection, limiting their ability to support network stability.
Innovation Solution
A controller for static energy supply units that compares simulated output voltage signals with measured ac voltages to detect phase shifts, allowing for rapid power adjustments, mimicking the initial inertia-based response and final frequency-based response of ac synchronous generators, using a power converter to vary power supply based on phase and frequency signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional static energy supply units use frequency measurement for control, then the control system is simpler to implement, but the response speed is slower compared to ac synchronous generators
Solution Approach 1:
The patent applies the copying principle by creating a simulated synchronous generator model that replicates the inertia-based response characteristics of actual synchronous generators. The controller calculates an equivalent inertia power based on the relationship between frequency deviation and stored inertia parameters, thereby copying the dynamic response behavior without requiring physical rotating mass. This allows static energy supply units to achieve fast response speeds comparable to synchronous generators while maintaining the simplicity of electronic control systems.
2Reliability
If static energy supply units respond rapidly to load changes, then network stability is improved, but the control accuracy may be compromised without proper inertia simulation
Solution Approach 1:
The patent implements feedback control by continuously monitoring the frequency deviation and using it to calculate the required inertia power adjustment. The controller compares the actual frequency with the reference frequency, determines the frequency deviation, and adjusts the power output accordingly to maintain network stability. This closed-loop feedback mechanism ensures both rapid response and accurate control by constantly adapting the power output based on real-time frequency measurements.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the equivalent inertia power based on varying frequency deviation conditions. The controller modifies the inertia power parameter in response to different operating conditions and frequency deviations, allowing the system to maintain optimal control accuracy across a range of scenarios. This adaptive parameter adjustment enables the system to replicate the nuanced response characteristics of synchronous generators under different load conditions.
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3(a)~3(d)
AI summary
A static energy supply unit (2) has an energy store (4) connected to an ac supply network (SN) by a power converter (8). A unit controller (20) for the static energy supply unit (2) includes an amplitude controller (26), a phase controller (30) and a frequency controller (34). These measure and storing respective voltage characteristics of the ac voltage(s) of the ac supply network and provide output signals indicative of the voltage characteristics for the prevailing or most recent operating condition of the ac supply network (SN). A signal generator (22) for generating a simulated output voltage signal (24a, 24b, 24c) for each phase of the ac supply network (SN) is provided. The simulated output voltage signal(s) (24a, 24b, 24c) have voltage characteristics derived from the amplitude, phase and frequency output signals (28, 32, 36), respectively. A comparator is used to compare the simulated output voltage signal (24a, 24b, 24c) for each phase and a measured ac voltage for a corresponding phase of the ac supply network (SN). The controller (20) controls the operation of the power converter (8) to vary the amount of power that is supplied to the ac supply network (SN) from the energy store (4) based on the comparison of the simulated output voltage signal(s) (24a, 24b, 24c) and the measured ac voltage(s).