Grid Interconnection Device Voltage Control via Impedance Calculation
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Solution Overview
Problem
Existing grid interconnection devices face challenges in accurately controlling voltage at interconnection points in power grids with distributed power sources, leading to inefficiencies in reactive power management.
Innovation Solution
A grid interconnection device equipped with a calculation unit and a control unit that calculates and adjusts output power based on voltage at the interconnection point, using impedance components and Volt-Var characteristic information to control reactive power, and a server that communicates with multiple grid interconnection devices to transmit control information for precise voltage management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage control is performed using conventional methods in grid interconnection devices, then the control process is simple, but the voltage control accuracy at interconnection points deteriorates
Solution Approach 1:
The control unit performs feedback control by continuously monitoring the voltage at the interconnection point and adjusting the reactive power output of the grid interconnection device based on the detected voltage deviations. This closed-loop feedback mechanism enables accurate voltage control at interconnection points by dynamically responding to voltage changes and correcting them through reactive power adjustment.
Solution Approach 2:
The patent replaces conventional voltage control methods with a calculation-based approach that computes the required reactive power output using voltage control equations. Instead of relying on traditional mechanical or empirical control mechanisms, the system calculates optimal reactive power values based on detected voltage conditions and control characteristics, achieving higher precision through computational methods.
2Reliability
If reactive power output is increased to manage voltage deviations, then voltage control capability is improved, but energy loss increases
Solution Approach 1:
The control unit adjusts the reactive power output to only the extent necessary for voltage control, avoiding excessive reactive power injection or absorption. By calculating the precise reactive power needed based on voltage deviations and control characteristics, the system performs partial action - providing just enough reactive power support to maintain voltage within acceptable ranges while minimizing unnecessary energy losses.
Solution Approach 2:
The system dynamically changes the reactive power output parameter based on real-time voltage conditions at the interconnection point. By adjusting the reactive power parameter in response to voltage deviations and using voltage control characteristics to optimize the adjustment, the system maintains voltage reliability while minimizing energy losses associated with reactive power management.
Data Source
AI summary
It is desirable to improve the accuracy of voltage control in the grid interconnection device for supplying the power generated by the distributed power source to the interconnection point. Provided is a grid interconnection device for supplying power generated by a distributed power source to an interconnection point, comprising: a calculation unit for calculating voltage at the interconnection point based on output voltage of the grid interconnection device, output current of the grid interconnection device, and an impedance component between the grid interconnection device and the interconnection point; and a control unit for controlling output power from the grid interconnection device, based on voltage at the interconnection point calculated by the calculation unit.