Inverter Controller Phase-Specific Power Balancing
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Solution Overview
Problem
Existing controllers for renewable power systems only consider public power grid requirements, leading to unbalanced power feed into the grid, which can cause grid disturbances and inefficiencies, as they do not account for the varying power demands of local loads across different phases.
Innovation Solution
A controller arrangement that individually controls each phase of a multiphase AC output power based on specific power signals per phase, allowing for flexible adjustment to meet both local load and grid requirements, ensuring balanced power distribution and efficient self-consumption of renewable energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single controller controls the total output power of the inverter, then the control structure is simple, but the power distribution across phases becomes unbalanced causing grid disturbances
Solution Approach 1:
The single controller is segmented into multiple phase-specific control units (first control unit for first phase, second control unit for second phase, third control unit for third phase). Each control unit independently controls the output power of its corresponding phase based on phase-specific power signals, enabling balanced power distribution while maintaining overall system coordination.
2Reliability
If the controller only considers public power grid requirements, then grid compliance is achieved, but local load power demands are not optimized leading to reduced self-consumption ratio
Solution Approach 1:
The control system applies local quality by receiving and processing separate power signals for each phase that represent both grid requirements and local load demands. Each phase is controlled with locally optimized power distribution, allowing the system to simultaneously satisfy grid compliance requirements and maximize local self-consumption by matching power delivery to actual local load needs.
3Ease of manufacture
If the inverter outputs fixed multiphase AC power, then the conversion process is simple, but the system cannot adapt to varying local load demands across different phases
Solution Approach 1:
The inverter transitions from fixed power output to dynamic power output. Each phase's output power is dynamically adjusted based on real-time phase-specific power signals that reflect varying local load demands. The control units continuously modify the output power of each phase to match changing load conditions while maintaining the fundamental DC-to-AC conversion function.
Data Source
AI summary
The present application relates to a controller arrangement for controlling an inverter for converting an input power from a power source to a multiphase AC output power provided at a power output of the inverter. The power output is connected to a load and additionally to a power grid. The controller arrangement includes a signal input for receiving a power signal per phase representative of at least one of the power per phase provided to the load or the power per phase provided to the power grid. The controller arrangement is further adapted to control each phase of the multiphase AC output power individually according to the corresponding power signal. The invention further relates to an inverter comprising such a controller arrangement, a power distribution arrangement comprising such an inverter and a controller arrangement to control the inverter and the invention further relates to a method for controlling such an inverter.