Power Conversion Device Voltage Stabilization via Dead Zone Control
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Solution Overview
Problem
Existing power conversion systems in distributed power generation systems require expensive stabilization facilities like SVC and large-capacity storage batteries to manage voltage fluctuations caused by abrupt changes in solar radiation, leading to unnecessary suppression of power generation and increased costs.
Innovation Solution
A power conversion device with an inverter, voltage measurement unit, effective voltage calculator, voltage control target generator, communication interface, and inverter controller is used to autonomously control active and reactive power output, stabilizing system voltage without the need for expensive stabilization facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If expensive stabilization facilities like SVC and large-capacity storage batteries are installed to manage voltage fluctuations, then system voltage stability is improved, but device complexity and cost increase
Solution Approach 1:
The power conversion device autonomously monitors AC effective voltage and self-regulates active and reactive power output to maintain voltage within the dead zone range, eliminating the need for external stabilization facilities like SVC or large-capacity storage batteries
Solution Approach 2:
The device continuously measures AC effective voltage, compares it against the dead zone range, and adjusts power output accordingly - when voltage exceeds the dead zone, the device modulates active and reactive power to return voltage to the acceptable range, creating a closed-loop control system
2Stability of the object's composition
If suppression facilities are installed to control voltage rise, then voltage stability is improved, but power generation is unnecessarily suppressed
Solution Approach 1:
The device dynamically adjusts active and reactive power output based on real-time voltage conditions within the dead zone framework, allowing maximum power generation when voltage is stable and providing targeted suppression only when voltage exceeds thresholds, rather than continuous suppression
3Stability of the object's composition
If system stabilization facilities are installed in a town scale, then voltage stability is improved, but cost increases and may require consumers to bear part of the cost
Solution Approach 1:
Instead of installing centralized town-scale stabilization facilities, the voltage control function is segmented and distributed to individual power conversion devices at each premises, with each device independently managing its own voltage control within the dead zone framework
Solution Approach 2:
The patent replaces expensive, large-capacity storage batteries and SVC facilities with smaller, more economical power conversion devices that provide adequate voltage control for individual premises without requiring costly infrastructure
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
The power conversion device effectively stabilizes AC distribution system voltage by autonomously controlling active and reactive power, reducing the need for costly stabilization facilities and minimizing power generation suppression.
Implementation Method 1
an inverter, which converts direct-current (DC) power output from the distributed power supply into AC power
Data Source
AI summary
A solar cell power conversion device is disposed between a solar cell and a consumer premises distribution system. A storage battery power conversion device is disposed between a storage battery and the consumer premises distribution system. When an AC effective voltage in the consumer premises distribution system deviates from a voltage range defined in accordance with dead zone information transmitted from HEMS, system voltage stabilization control for returning the AC effective voltage to fall within the voltage range is performed by control of active power and reactive power that are output from a first DC/AC conversion circuit and a second DC/AC conversion circuit.