Virtual Synchronous Inverter Standby Time Control
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Solution Overview
Problem
Power generation systems experience instability and potential power outages due to large power fluctuations and disconnection of control synchronization signals or failure of master devices, leading to unstable operations and protective device activation.
Innovation Solution
Incorporating virtual synchronous inverters with storage batteries that calculate a standby time and control charging/discharging based on operation instructions, allowing for independent operation and stabilization of power system frequency, thereby suppressing large changes in instantaneous power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power supply/demand devices are connected in parallel to increase power generation capacity, then the total power output increases, but large power fluctuations occur when the system frequency deviates from standard frequency
Solution Approach 1:
The control device calculates a standby time before each power supply/demand device operates, causing devices to start operations at different times rather than simultaneously. This preliminary timing calculation prevents sudden large power fluctuations when multiple devices start at once, while still achieving the desired total power output through coordinated sequential operation.
2Stability of the object's composition
If control synchronization signal lines are used to coordinate multiple grid-connected inverters, then synchronous operation is achieved, but the system becomes unstable and power outages occur when the signal line is disconnected
Solution Approach 1:
Each power supply/demand device independently calculates its own standby time and determines its operation timing without relying on continuous synchronization signals from other devices. This self-service approach allows devices to maintain stable operation even when control synchronization signal lines are disconnected, eliminating the single point of failure represented by the master-slave dependency.
3Ease of operation
If a master device controls multiple slave devices in a power generation system, then centralized control is achieved, but the entire system becomes unstable and causes power outages when the master device fails
Solution Approach 1:
The centralized control function is segmented and distributed to each power supply/demand device individually. Each device independently calculates standby times and determines its own operation timing, eliminating the single point of failure represented by the master device. This segmentation maintains operational simplicity while dramatically improving system reliability through decentralized autonomous operation.
4Speed
If virtual synchronous inverters operate simultaneously upon receiving operation instructions, then rapid power response is achieved, but large instantaneous power changes cause protective devices to operate and trigger power outages
Solution Approach 1:
The control device performs preliminary calculation of standby times for each power supply/demand device before operation instructions are executed. This preliminary timing calculation ensures that devices operate in a coordinated sequential manner rather than simultaneously, preventing large instantaneous power changes that would trigger protective devices, while still maintaining rapid overall system response.
Data Source
AI summary
According to one embodiment, a power supply/demand device includes a virtual synchronous inverter and a storage battery. The virtual synchronous inverter is connected to a power system. Charging and discharging of the storage battery are controlled by the virtual synchronous inverter. The virtual synchronous inverter is connected to the power system in parallel with other inverters. The virtual synchronous inverter is capable of calculating a first standby time having any length and performing control of the storage battery corresponding to an operation instruction after a lapse of the first standby time, when receiving the operation instruction accompanied by output of power to the power system or input of power from the power system.