DC Coupling Power Allocation Under Discharge Amplitude Limits
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Solution Overview
Problem
Conventional power systems face reliability issues due to the uncertainty of new energy sources like wind and solar energy, leading to potential overvoltage, overcurrent, and reduced system reliability when power allocation is based on rated capacity or current maximum power.
Innovation Solution
A power system comprising direct current coupling units, buses, and a controller that allocates power based on maximum discharging power limits, performing iterative calculations to determine network input power values, ensuring that at least one unit operates within amplitude limits to prevent overloading and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power allocation is performed based on rated capacity, then power system structure is simplified, but energy conversion efficiency of new energy devices is low
Solution Approach 1:
The patent implements dynamic power allocation by continuously adjusting the power output of each direct current coupling unit based on real-time operating conditions, new energy availability, and load demands. This dynamic control mechanism allows the system to adapt to changing conditions while maintaining a relatively simple overall structure, resolving the contradiction between structural simplicity and energy conversion efficiency.
2Productivity
If power allocation is performed based on current maximum power of each device, then energy conversion efficiency is improved, but overvoltage or overcurrent occurs and reliability is reduced
Solution Approach 1:
The patent employs a feedback control mechanism where the controller continuously monitors the operating status of each direct current coupling unit, including voltage, current, and power output. Based on this feedback information, the controller dynamically adjusts the power allocation to ensure that no unit exceeds its safe operating limits, thereby preventing overvoltage and overcurrent conditions while maintaining high energy conversion efficiency.
Solution Approach 2:
The patent changes the operating parameters of direct current coupling units dynamically by adjusting their power output based on real-time conditions. The controller modifies parameters such as discharging power, charging power, and operating voltage within safe ranges to optimize energy conversion while preventing harmful overvoltage or overcurrent conditions, thus resolving the reliability-efficiency contradiction.
3Measurement precision
If iterative calculation is performed to determine network input power values, then power allocation precision is improved, but calculation time increases
Solution Approach 1:
The patent performs preliminary actions by pre-establishing the mathematical models and constraints for power allocation, including the objective function and constraint conditions for each direct current coupling unit. This preparation allows the iterative calculation to converge faster by starting from well-defined initial conditions, thus reducing calculation time while maintaining precision.
Solution Approach 2:
The patent implements a balanced approach by performing iterative calculations to an appropriate precision level rather than pursuing excessive precision. The controller stops the iterative process when the power allocation converges to a satisfactory precision threshold, avoiding unnecessary calculation time while ensuring sufficient accuracy for practical power system operation.
Data Source
AI summary
A power system includes N direct current coupling units, N direct current buses, and a main controller. The main controller is configured to: obtain a total network input demand power (a network input power required by the power grid); obtain first amplitude limiting values (indicate a maximum discharging power that can be supplied by each energy unit to the power grid); and determine first network input power values (a power value allocated to each energy unit and that is input to the power grid, and at least one direct current coupling unit is in a first amplitude limiting state) based on the total network input demand power and the first amplitude limiting values, and the first amplitude limiting state is that a first network input power value of direct current coupling unit is equal to a first amplitude limiting value corresponding to the direct current coupling unit.