HVDC Controller Power Supply via DC Transmission

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Solution Overview

Problem

Conventional HVDC systems face challenges in powering HVDC controllers connected to independent AC passive power grids, especially during power failures or interruptions, as they lack a power source, requiring large batteries or generators, and existing solutions are cumbersome for remote restart and size/weight reduction.

Innovation Solution

A power supply device for HVDC controllers that utilizes DC power from an HVDC converter connected to an AC active power grid, including a first and second HVDC converter unit, a voltage distributor, and a DC-DC converter, allowing remote power control and early resumption of operation by switching between active and passive power sources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a battery is used to supply power to the HVDC controller of a passive power grid, then the controller can operate during power failures, but the battery must be high-capacity to supply power for a long time (about 72 hours)

Engineering Contradiction:

Improvepower supply reliability during power failureVSAvoidbattery capacity

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent combines the power supply functions of the active power grid and passive power grid into a unified system. The HVDC converter station connected to the active power grid provides power to the HVDC controller through the DC transmission line, eliminating the need for a separate high-capacity battery system while ensuring continuous operation during power failures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces an intermediary power supply mechanism where the HVDC converter station connected to the active power grid acts as a mediator to provide power to the HVDC controller. This intermediary system transfers power through the DC transmission line, replacing the direct battery-to-controller connection and reducing the required battery capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a power generator is used as a power source for the HVDC controller of an independent passive power grid, then the controller can be supplied with power, but additional batteries are required to control the power generator during interruptions

Engineering Contradiction:

Improvepower supply capabilityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the power generation and power supply control functions into a single integrated system. The HVDC converter station connected to the active power grid provides both power generation and control capabilities, eliminating the need for separate battery systems to control the power generator during interruptions.

Inventive Principle:

Principle #5Merging (Combining)

3Weight of stationary object

If DC power from an HVDC converter connected to an AC active power grid is used to supply the HVDC controller, then the device size and weight are reduced, but the system requires connection to an active power grid

Engineering Contradiction:

Improvepower supply device weightVSAvoidgrid connection requirement

Core Design Contradiction:

Weight of stationary objectVSAdaptability or versatility

Solution Approach 1:

The patent creates a universal power supply system that can adapt to both active and passive power grid configurations. The system uses the HVDC converter station connected to the active power grid as a multi-functional unit that can provide power to both the DC transmission line and the HVDC controller, making the system versatile for different grid scenarios.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 efficient and remote power supply to HVDC controllers connected to passive power grids, reducing device size and weight by using active power grid output, ensuring early power resumption and stable operation during passive power grid interruptions.

Implementation Method 1

converts AC power into DC power

Methodology Applied

Scientific EffectAC to DC conversion:

Implementation Method 2

converts the first DC power into second DC power at a lower voltage

Methodology Applied

Scientific EffectDC to DC voltage conversion:

Implementation Method 3

divides the second DC power into third DC power at a lower voltage suitable for the HVDC controller

Methodology Applied

Scientific EffectVoltage division:

Data Source

PatentEP3091634B1Power supply device for HVDC controller

Publication Date: 2021.06.16 HYOSUNG HEAVY IND CORP

Figure 1~2
Figure 3

AI summary

The present invention consists of: a first HVDC converter unit which is connected to a powered electrical grid; a second HVDC converter unit which is connected to a powerless electrical grid and connected to the first HVDC converter unit through a DC transmission line so as to receive a first DC power source from the first HVDC converter unit; a voltage distributor which is connected to the DC transmission line connecting the first HVDC converter unit and the second HVDC converter unit so as to receive and distribute the first DC power source applied from the first HVDC converter unit to the second HVDC converter unit, and output a second DC power source that is lower than the first DC power source; and a DC-DC converter which is connected to the voltage distributor so as to receive the second DC power source, convert the second DC power source into actuating power for use in a HVDC controller and output the actuating power.