Converter Circuit Voltage Dip Simulation for Grid Testing
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Solution Overview
Problem
Existing methods for testing energy generators and consumers, such as wind turbines, can only simulate voltage dips in fixed steps and frequencies, failing to accurately mimic real-world short circuits, which limits the effectiveness of fault-ride-through condition testing.
Innovation Solution
An electrical circuit with a converter circuit and switch configuration, including a choke coil and electronic power semiconductor switches, allows for dynamic control of voltage at a connection point, enabling simulation of any desired voltage curves and frequencies, thereby simplifying and improving the testing of energy generators and consumers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fixed-step voltage dip simulation is used, then the testing procedure is simplified, but the simulation accuracy and realism are reduced
Solution Approach 1:
The patent applies dynamics by transitioning from fixed-step voltage dip simulation to continuous, dynamically adjustable voltage curves. The converter circuit is controlled to generate voltage dips with variable depth, duration, and shape, allowing realistic simulation of actual grid faults while maintaining testability through systematic control parameters.
Solution Approach 2:
The invention utilizes parameter changes by enabling continuous adjustment of voltage dip characteristics including depth, duration, and waveform shape. The converter circuit responds to control signals that modify these parameters in real-time, allowing comprehensive testing of generator fault-ride-through capabilities under diverse voltage dip conditions.
2Ease of operation
If converter circuit alone is used for voltage control, then voltage adjustment is achieved, but the transition characteristics and network hardness cannot be adequately controlled
Solution Approach 1:
The patent applies segmentation by dividing the voltage control function into two distinct components: the converter circuit for voltage magnitude adjustment and the series choke coil for transition characteristic control. This segmentation allows independent optimization of each function, with the choke coil specifically addressing network hardness and transition dynamics that the converter alone cannot achieve.
Solution Approach 2:
The series choke coil acts as an intermediary element between the converter circuit and the generator. It mediates the voltage transition by introducing inductive reactance that shapes the voltage dip profile, controlling the rate of change and providing realistic network impedance characteristics during fault simulation.
3Adaptability or versatility
If overload capacity is increased to handle short circuit simulation, then the simulation capability is improved, but the device complexity and cost increase
Solution Approach 1:
The series choke coil serves as a mediator that enables short circuit simulation without requiring the converter circuit to handle full short circuit currents. The choke coil limits the current magnitude while maintaining the voltage dip characteristics, allowing realistic short circuit testing with reduced stress on the converter components.
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
This solution enables realistic simulation of short circuits and voltage dips at various frequencies, allowing for more comprehensive testing of energy generators' fault-ride-through capabilities with reduced overload capacity and increased precision.
Implementation Method 1
a converter circuit (29) is present, with which a voltage present at the connection point (P) can be influenced
Implementation Method 2
there is a series circuit that is made up of a choke coil (31) and a first switch (32) and that is coupled to the connection point (P)
Data Source
Figure 1
Figure 2
AI summary
The method involves influencing voltage (Vpcc) using a converter circuit (29), where the voltage like at a connection point (P) to which an energy generator or an energy consumer is attached. A series connection is designed from an induction coil (31) and a switch (32). The series connection is coupled with the connection point. The converter circuit is influenced such that the voltage is transferred to the connection point in a desired value and the switch is closed. A parallel circuit is designed from an induction coil and another switch. An independent claim is also included for an electrical circuit for testing an energy generator, comprising an induction coil.