Elevator Power Supply Control Using Secondary Energy Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power systems for vertical transportation arrangements, such as elevators and escalators, face challenges in maintaining optimum speed and efficiency due to fluctuations in energy availability, often leading to compromised acceleration and running speeds during peak usage or low energy conditions.
Innovation Solution
A power system that integrates a primary power source with a secondary power source, such as energy storage, allowing for controlled power distribution to vertical transportation devices, enabling them to operate at optimum speeds by utilizing the secondary power during peak demand and optimizing energy storage through smart grid information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power is limited by setting upper threshold values to elevator acceleration speed and/or running speed, then power consumption is reduced, but the acceleration or running speed of the vertical transportation devices is compromised
Solution Approach 1:
The system performs preliminary action by storing energy in the energy storage system during periods of low power demand or low electricity costs. This pre-stored energy is then available to support high power consumption during peak demand periods, allowing the elevator to maintain optimal acceleration and running speeds without being constrained by power thresholds.
Solution Approach 2:
The system dynamically changes the power source parameters by switching between drawing power from the electrical network and discharging stored energy from the energy storage system. This parameter change allows the system to maintain high power output during acceleration phases while managing overall power consumption through intelligent control of the power mix.
2Power
If power is limited by allocating calls so that only one elevator car at a time is moving, then power consumption is reduced, but productivity of the elevator group is reduced
Solution Approach 1:
The system performs preliminary action by pre-charging the energy storage system during off-peak periods. This allows multiple elevator cars to operate simultaneously during peak demand periods without causing power overloads, thereby maintaining high productivity while managing power consumption through the buffered energy capacity.
Solution Approach 2:
The energy storage system acts as an intermediary between the electrical network and the elevator group. It absorbs excess power during low-demand periods and releases it during high-demand periods, enabling multiple elevators to operate concurrently without directly drawing excessive power from the network, thus maintaining both productivity and power management.
3Reliability
If energy storage is used to provide power during peak demand, then dependency on steady electricity supply is reduced, but device complexity increases
Solution Approach 1:
The energy storage system is designed to perform multiple functions: it stores energy for later use, provides power during peak demand, and can potentially feed regenerative braking energy back into the system. This multi-functionality justifies the added complexity by delivering multiple benefits from a single integrated component.
Solution Approach 2:
The control system continuously monitors the state of charge of the energy storage system, the current power demand of the elevator, and the availability of power from the electrical network. Based on this feedback, it dynamically adjusts the power distribution between the network and the energy storage system, optimizing reliability while managing complexity through intelligent control algorithms.
Data Source
Figure 1~2
AI summary
The current disclosure relates to a power system for feeding power into a vertical transportation arrangement. The power system comprises a first interface (1) for connecting to a primary power source (2); a second interface (3) for connecting to a secondary power source (4); and power controlling means (5) for controlling feeding of power from the primary power source (2) and/or the secondary power source (4) to a motor (6) for driving a vertical transportation device. The power system is characterized in that the power controlling means (5) is configured to control feeding at least some of the power used by the motor (6) during normal operation from the secondary power source (4). The current disclosure also relates to a method and vertical transportation arrangements.