Power Conversion Circuit for Controlled AC Output

Solution Overview

Problem

Existing power supply systems with integrated photovoltaic and storage battery systems face challenges in controlling output AC power to match system needs, leading to potential battery exhaustion and inefficiencies, particularly in planned energy use scenarios, and require modifications to the power conditioner, limiting their general-purpose applicability.

Innovation Solution

A power supply system comprising an electrical storage device, a power conversion circuit to convert DC power into controlled AC power, and a power control unit that adjusts the output AC power to a predetermined value, allowing for stable and efficient power distribution without altering the existing power conditioner configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the entire DC power of the storage battery system is converted into AC power using the power conditioner, then the power can be supplied to the system, but the output AC power cannot be controlled to a predetermined value, leading to potential battery exhaustion and inefficiencies

Engineering Contradiction:

Improvepower supply capabilityVSAvoidoutput power control

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent introduces a power conversion circuit as an intermediary component between the storage battery system and the power conditioner. This circuit converts DC power from the storage battery into controlled DC power before supplying it to the power conditioner, enabling precise control of the output AC power while maintaining the existing power conditioner configuration.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the power conversion function into two distinct parts: a power conversion circuit that converts DC to controlled DC, and the existing power conditioner that converts DC to AC. This segmentation allows the control function to be added without modifying the power conditioner itself, preserving its general-purpose applicability.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the power conditioner configuration is modified to enable output power control, then the output AC power can be controlled to a predetermined value, but the general-purpose properties of the power conditioner are limited

Engineering Contradiction:

Improveoutput power controlVSAvoidgeneral-purpose applicability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent segments the power conversion function into two distinct parts: a power conversion circuit that converts DC to controlled DC, and the existing power conditioner that converts DC to AC. This segmentation allows the control function to be added without modifying the power conditioner itself, preserving its general-purpose applicability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a power conversion circuit as an intermediary component between the storage battery system and the power conditioner. This circuit converts DC power from the storage battery into controlled DC power before supplying it to the power conditioner, enabling precise control of the output AC power while maintaining the existing power conditioner configuration.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the operating point is moved away from the maximum power point to prevent feeding abnormalities, then interconnection release is suppressed, but maximum power cannot be regenerated

Engineering Contradiction:

Improveinterconnection stabilityVSAvoidpower regeneration efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent performs preliminary power conversion and control in the DC domain before the power reaches the AC conversion stage. By controlling the DC power output from the storage battery through the power conversion circuit, the system can optimize power extraction without causing feeding abnormalities at the AC interconnection point.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The power conversion circuit acts as an intermediary that decouples the storage battery control from the AC interconnection stability requirements, allowing independent optimization of both maximum power extraction and interconnection stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables controlled output power from the electrical storage device, preventing excessive power supply and battery wastage, while utilizing existing power conditioners as control units, ensuring efficient and practical energy management.

Implementation Method 1

a power conversion circuit configured to convert a power from the electrical storage device into converted DC power

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Implementation Method 2

a power control unit configured to receive the converted DC power and output AC power

Methodology Applied

Scientific EffectElectromagnetic transformation: Electromagnetic Induction

Data Source

PatentUS9729083B2Power supply system and power source apparatus

Publication Date: 2017.08.08 MURATA MFG CO LTD

AI summary

A power supply system that comprises an electrical storage device; a power conversion circuit configured to convert a power from the electrical storage device into converted DC power; and a power control unit configured to receive the converted DC power and output AC power. The converted DC power is controlled such that the output AC power is a predetermined AC power.