Distributed Power Control Device for Grid Voltage Stabilization

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Solution Overview

Problem

Control devices such as power conditioners struggle to output sufficient reactive power for voltage stabilization of utility grids and lack appropriate consideration for reactive power output calculations.

Innovation Solution

A control device with a range setting unit and output control unit that adjusts reactive and active powers within an allowable range, receiving excess output commands to output reactive power beyond the range, while maintaining active power, and a consideration calculation device that calculates compensation based on reactive power excess or increase.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the control device outputs reactive power exceeding the allowable range to stabilize utility grid voltage, then the voltage stabilization effect is improved, but the control device operates beyond its normal capacity limits

Engineering Contradiction:

Improvevoltage stabilizationVSAvoidreactive power output range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic control of reactive power output by switching between normal operation mode (within allowable range) and excess output mode (beyond allowable range) based on real-time grid voltage conditions. The control device dynamically adjusts its operating parameters to maintain voltage stability while managing capacity constraints.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the reactive power output parameter from being constrained within a fixed allowable range to being dynamically adjustable beyond that range when excess output commands are received. This parameter change enables the control device to provide additional reactive power support during critical grid conditions.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the control device increases reactive power output to exceed the allowable range, then the grid voltage stabilization is improved, but the active power supplied to the utility grid is reduced

Engineering Contradiction:

Improvevoltage stabilizationVSAvoidactive power supply

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The patent applies partial action by increasing reactive power output only to the extent necessary for voltage stabilization, rather than continuously operating at maximum capacity. The control device selectively exceeds the allowable range only when excess output commands are received, maintaining normal operation otherwise.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The control device dynamically balances reactive and active power output based on real-time commands and grid conditions. When excess reactive power is needed, the device adjusts its power distribution to prioritize voltage stabilization while minimizing impact on active power supply.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If the control device operates within the allowable reactive power range at normal times, then the device complexity is reduced, but the ability to respond to grid voltage fluctuations is limited

Engineering Contradiction:

Improvecontrol operation simplicityVSAvoidreactive power response capability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent segments the reactive power output capability into two distinct modes: normal operation within the allowable range and excess output beyond the allowable range. This segmentation allows the control device to maintain simple operation during normal conditions while having the capability to respond to urgent grid stabilization needs when commanded.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The control device is designed with multi-functionality to handle both normal reactive power control and excess reactive power output. The same control device performs routine voltage support within limits and can also provide emergency reactive power boosting, eliminating the need for separate devices for different operational scenarios.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11705731B2Control device, consideration calculation device, power system, and computer-readable medium having recorded thereon a program

Publication Date: 2023.07.18 FUJI ELECTRIC CO LTD

AI summary

In order to output sufficient reactive power for voltage stabilization of a utility grid, and calculate an appropriate consideration according to an amount of the output reactive power, is provided a control device for controlling a distributed power source connected to the utility grid, comprising: a range setting unit where an allowable range of reactive and active powers output at normal times is set; an output control unit for controlling the reactive and active powers supplied from the distributed power source to the utility grid within the allowable range set in the range setting unit; and a reception unit for receiving, from a command device in the utility grid, an excess output command indicating that the reactive power exceeding the allowable range should be output, wherein the output control unit is for outputting the reactive power out of the allowable range when the reception unit receives the excess output command.