Drilling Rig Energy Storage System Regenerative Power Recovery
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Solution Overview
Problem
Existing power supply systems for drilling rigs do not effectively absorb and store regenerative energy generated during operations, resulting in energy wastage.
Innovation Solution
A power storage and supply system incorporating an Energy Storage System (ESS) that utilizes bi-directional DC-to-DC converters and DC-to-AC inverters to charge and discharge regenerative energy, allowing for its storage and reuse in operating motors and loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative energy is dissipated as heat through braking resistors, then the power supply system is simple, but energy is wasted
Solution Approach 1:
An Energy Storage System (ESS) is introduced as an intermediary component between the DC bus and the motors. The ESS absorbs regenerative energy during braking operations and stores it, then releases it during acceleration phases, preventing energy waste while maintaining system simplicity through modular integration
Solution Approach 2:
The system changes the energy dissipation parameter from thermal dissipation (heat) to electrical storage and reuse. By converting the energy flow parameter from one-way dissipation to two-way storage and release, the system recovers regenerative energy without requiring complete system redesign
2Loss of energy
If additional loads are switched on to consume regenerative energy, then energy utilization improves, but system complexity and operational requirements increase
Solution Approach 1:
The Energy Storage System operates autonomously to manage regenerative energy without requiring manual intervention or additional operational complexity. The ESS automatically charges during braking and discharges during acceleration, making the energy recovery process self-regulating and eliminating the need for operators to switch additional loads
3Use of energy by moving object
If regenerative energy is stored in the Energy Storage System, then fuel efficiency improves, but the device complexity increases
Solution Approach 1:
The Energy Storage System serves multiple functions simultaneously: it stores regenerative energy from braking, provides power during acceleration, and can support auxiliary loads. This multi-functionality justifies the added complexity by delivering comprehensive energy management benefits across various operational modes
Solution Approach 2:
The ESS enables continuous useful action by maintaining energy availability throughout the drilling rig's operational cycle. Energy recovered during deceleration phases is immediately available for acceleration phases, creating a continuous energy circulation that improves overall fuel efficiency without interruption
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
Optimizes the operating point of generator sets, reduces fuel consumption, and minimizes emissions by efficiently utilizing regenerative energy, enhancing the overall performance and efficiency of drilling rig operations.
Implementation Method 1
regenerative energy can be generated during some operations of a drilling rig, e.g. operations of drawworks and jacking system
Implementation Method 2
an Energy Storage System (ESS) for absorbing and storing regenerative energy
Implementation Method 3
at least one bi-directional DC-to-DC converter connected between the primary common DC bus and the at least one secondary DC bus
Implementation Method 4
at least one DC-to-AC inverter connected between the at least one secondary DC bus and the at least one motor group
Data Source
AI summary
The invention provides a power storage and supply method and system for a drilling rig. The system comprises a primary common direct current (DC) bus, at least one secondary DC bus, at least one bi-directional DC-to-DC converter connected between the primary common DC bus and the secondary DC bus, at least one motor group each connected to the secondary DC bus through a DC-to-AC inverter, and an Energy Storage System (ESS) configured to be charged by regenerative energy from at least one motor group and discharge power to at least one motor group through the primary common DC bus and the bi-directional DC-to-DC converter. The system may further comprise a bi-directional AC-to-DC converter between the primary DC bus and an AC bus, wherein the ESS is further configured to be charged by regenerative energy generated during lowering operation of a jacking system for the drilling rig, wherein the jacking system is connected to the AC bus.