Multi-node Synchronous Power Grid Test via GPS Timing
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Solution Overview
Problem
Traditional test methods for power system monitoring and control systems in large regions with multiple nodes cannot perform synchronous simulation tests across multiple transformer stations and booster stations, limiting the ability to conduct comprehensive and reliable tests for safe and stable operation of synchronous large power grids.
Innovation Solution
A multi-node synchronous simulation test method using GPS time as a reference, remotely controlling synchronized simulators across multiple nodes through a control center to output AC simulation signals and simulate various operational conditions, ensuring system performance and reliability through wireless communication using GSM, CDMA, or 3G, and including time synchronization and test command issuance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional in situ test method is used, then test implementation is simple, but synchronous test across multiple nodes cannot be carried out
Solution Approach 1:
The test system is segmented into multiple independent simulators distributed at different nodes, each equipped with local GPS timing. This allows each node to operate independently while maintaining synchronization, enabling multi-node testing without requiring a centralized complex test system.
Solution Approach 2:
GPS timing signals serve as an intermediary mechanism to synchronize multiple distributed simulators. The GPS provides a common time reference that coordinates the operation of simulators across different nodes, enabling synchronous testing without direct complex inter-node communication infrastructure.
2Measurement precision
If GPS time synchronization is implemented across multiple nodes, then time synchronization accuracy is improved, but communication infrastructure requirements increase
Solution Approach 1:
The GPS receiver serves multiple functions: it provides both the timing reference for synchronization and the communication channel for coordinator contact. This multi-functionality reduces the need for separate dedicated communication infrastructure, as the GPS infrastructure itself is leveraged for both timing and communication purposes.
3Ease of operation
If wireless communication modes (GSM, CDMA, 3G) are used for coordinator-simulator communication, then installation flexibility is improved, but communication reliability may be affected
Solution Approach 1:
The system allows dynamic selection and switching between different wireless communication parameters and modes (GSM, CDMA, 3G). By being able to change communication parameters and select alternative modes, the system can adapt to varying environmental conditions and maintain reliable communication while preserving installation flexibility.
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
Enables real-time dynamic simulation and functional testing of wide-area power grids, improving the reliability and safety of intelligent power grid operations by allowing comprehensive testing of monitoring and control systems across multiple nodes, including steady accuracy, transient signal, and fault simulation tests.
Implementation Method 1
with GPS time as the time reference, conducting synchronous simulation test for equipment and system under test and distributed in different sites within agreed time
Implementation Method 2
produce three-phase AC signal of certain frequency, phase and amplitude or other fault waveform signals such as low-frequency oscillation signal through synchronous trigger with GPS pulse per second
Implementation Method 3
The control center of synchronous test and synchronously phased simulators complete communication in wireless way, optional modes to adopt include GSM, CDMA or 3G
Data Source
AI summary
A multi-node synchronous on-site test method, the method comprising: using GPS time as time reference, and conducting synchronous on-site tests on the devices to be tested and systems distributed at different places at an appointed time; controlling the synchronous phase control simulation devices distributed at multiple nodes via a synchronous test control center; within a uniform time section, synchronously outputting secondary side AC simulation signals, and simulating various actual operating conditions, thus achieving the detection of the monitoring and control performances of various dynamic monitoring and control systems, and ensuring the normal functions of the systems. The method of the present invention is able to conduct multi-node dynamic simulation test with synchronized GPS time, and achieves the detection of large-area multi-node monitoring and control systems. The present invention is suitable for the test of a wide area measurement system (WAMS) function, the simulation test of a damping control function, the simulation test of transiently stable state analysis and control functions, the simulation test of voltage stabilization and control functions, the simulation test of an islanding control function, the simulation test of wide area protection system functions and the like.