La principal ventaja de sustituir las resistencias de frenado por dispositivos de realimentación de energía para ascensores es convertir la energía eléctrica desperdiciada en recursos reutilizables, optimizando al mismo tiempo el rendimiento del sistema y reduciendo los costes a largo plazo. A continuación, se presenta un análisis específico:
1、Recuperación y utilización eficiente de energía
1. Conservación de energía y reducción del consumo
The elevator energy feedback device converts the regenerated electrical energy generated by the elevator's power generation state (such as heavy load down or light load up) into AC power of the same frequency and phase as the power grid through power electronics technology (such as IGBT inverter), and directly feeds it back to the power grid or other equipment in the building (such as lighting and ventilation systems) for use, with a power saving rate of up to 15% -45%; The braking resistor converts electrical energy into thermal energy through resistance, resulting in complete energy waste.
Typical benefits: A single elevator can save about 3000-6000 kWh of electricity annually, and after nationwide promotion, the annual energy savings are equivalent to the power generation of a Xiaolangdi hydropower station (about 5.2 billion kWh).
2. Economic improvement
Lower long-term costs: Although the initial investment of the elevator energy feedback device is relatively high (about 3-5 times that of the braking resistor), it can significantly reduce operating electricity costs due to energy recovery, and the cost can generally be recovered within 2-3 years; Although the initial cost of braking resistors is low, they require regular replacement and have higher long-term power consumption costs.
Reduced maintenance costs: Heating of brake resistors can easily lead to aging and require frequent maintenance; The elevator energy feedback device is basically maintenance free.
2、 System performance optimization
1. Reduce equipment load
When the braking resistor works, it generates high temperature, which will push up the temperature of the elevator machine room (requiring additional air conditioning cooling) and accelerate the aging of components such as the frequency converter and control board during long-term operation; The elevator energy feedback device eliminates heat sources, reducing the temperature of the machine room by 5-10 ℃ and extending the equipment life by more than 30%.
2. Enhance operational stability
The elevator energy feedback device quickly eliminates pump voltage (hysteresis voltage control technology), avoids circuit fluctuations caused by braking resistors, improves elevator braking efficiency and ride comfort, and reduces crashes caused by overheating.
3、 Environmental Protection and Compliance
1. Reduce carbon emissions
Recycling electricity directly reduces the total energy consumption of buildings and helps achieve the "dual carbon" goal. For example, a single elevator can reduce its annual carbon dioxide emissions by about 3-6 tons.
2. Compliant with green building standards
Meet energy-saving requirements such as LEED certification, respond to energy-saving regulations for special equipment, and enhance the corporate social responsibility image.
4、 Comparison of Technical Applicability
Advantages of scene elevator energy feedback device and limitations of braking resistance
Los ascensores de gran altura y alta frecuencia tienen importantes efectos de ahorro energético (como centros comerciales y hospitales), con un alto riesgo de sobrecalentamiento de la resistencia y un aumento vertiginoso de los costes de consumo energético.
Las condiciones de la red requieren un soporte de red estable y la tecnología de supresión armónica es madura (THD <5 %) sin requisitos de red, pero la tasa de utilización de energía es cero.
El presupuesto inicial es adecuado para inversiones a largo plazo y solo es adecuado para presupuestos limitados o escenarios de uso de baja frecuencia.
resumen
El valor principal de los dispositivos de retroalimentación de energía para ascensores reside en el ahorro energético (hasta un 45%), la mejora de la fiabilidad del sistema (reducción de refrigeración y fallos) y el cumplimiento medioambiental mediante el reciclaje de energía. Son especialmente adecuados para ascensores con una frecuencia de uso media a alta. La resistencia de frenado se utiliza únicamente como solución de respaldo de bajo coste, ideal para restricciones de la red eléctrica o necesidades de renovación temporal.