Electric Power Supply and Energy Management

Power demand in densely populated cities across the world is on the rise, and the peak hour electric charge has already been approximating the limit of total capacity for load in many cities. In front of numerous overhead lines and crowded underground cables, how to transmit electricity to central cities much more stably and effectively turns to be a challenge to the grid development of all countries.

Related Products and Applications:

Superconducting Cable

1. Brief Introduction

Nowadays, although EHV and UHV overhead cables can transmit electricity in a long distance and large capacity, ±500kV power transmission corridors are about 58m in width, and power transmission corridor per kilometer covers an area of 87 hectares, which is not suitable for densely populated areas. The voltage of underground cables in mainstream cities is below 220kV, with high electric current. Besides, the thermal radiation and electromagnetic radiation of cables set a relatively high demand on the depth and diameter of cable passages, but the underground shield costs a lot in dense cities. Furthermore, the annual transmission loss of power grid in China is as high as 7%, amount to the generating capacity of several Three Gorges Dams, about several hundred billion Yuan of loss.

The new generation of power transmission, DC superconducting transmission, becomes the optimal solution to the above problem. DC superconducting cable has a great electrical load capacity, and the current-carrying capacity of its superconducting material is about 50 to 500 times of that of copper wire in the same size, which increases the engineering carrying capacity by 5 to 10 times, and is quite suitable for the power transmission in mid-low voltage and huge current. In mid-low voltage, the size of superconducting cable is still far smaller than the regular high voltage cable with the same carrying capacity. DC superconducting transmission would reduce the electricity loss by 70%. Together with the refrigerating cost, the operating cost of superconducting cable is only 1/4 of the regular cable. Superconducting cable adopts the positive and negative endocentric structure, without electromagnetic radiation and thermal radiation, in simple pavement and of low construction cost. 

2. Values for Clients

 ⊙ Lower the construction cost substantially (only about 1/6 of the traditional cable)

 ⊙ Easy maintenance, low operating cost

 ⊙ No demand for overhead lines, reduce the floor space substantially, and reduce the land cost 

 ⊙ Reduce the electricity loss by 80%, environmentally-friendly

Superconducting Fault Current Limiter

1. Brief Introduction

With the constantly increasing power demand in dense cities, the installed capacity of electric system and grid transmission demand grows continuously, and potential short-circuit power and short-circuit current impact is also on the rise, which has brought a series of problems to the construction and operation of the electric system and posed a great threat to the stability and safety of the power grid and existing electrical equipment. Since the maximum breaking-capacity of breakers produced in the world is limited, the effective limit and reduction of short-circuit current can avoid the urgent upgrading demand of breaker, and even reduce the impact of instant short-circuit current on the entire system and all online devices. 

High temperature superconducting fault current limiter is considered as the most effective short-circuit fault current limiter at present. During the operation, the device has small impedance, but it would increase automatically in case of faults. Besides, it is also characterized by fast response speed (hundreds of microseconds) and automatic current limit, and can be used for a long term repeatedly. 

2. Values for Clients

 ⊙ Enhance the stability of the power grid substantially, and improve the reliability and safety of power supply 

 ⊙ Increase the transmission capacity of the power grid, and improve the power quality 

 ⊙ Reduce the capacity of the breaker significantly 

 ⊙ Reduce the power grid construction cost and transformation cost substantially

Superconducting Voltage Transformer

1. Brief Introduction

The majority of the total loss of traditional transformer in full-load operation is the copper loss in the winding. Superconducting voltage transformer mainly takes advantage of the resistance-free feature of superconducting materials to improve the performance, reduce the power loss in transmission, and increase the efficiency of transformer operation. Besides, it is characterized by high efficiency, small size, and no environmental pollution. Superconducting voltage transformer of the same capacity is about 40% to 60% smaller than the regular transformer, and can be installed in the current transformer substations directly, to save the re-construction cost.

2. Values for Clients

 ⊙ Reduce the size and weight, lower the transmission and transfer cost 

 ⊙ Lower rated loss and operating cost

 ⊙ With strong safety performance and longer life span

Superconducting Magnetic Energy Storage

1. Brief Introduction

Problems like the low frequency oscillation in the power grid, engine failure, voltage drop caused by the access of large load to the power grid, transmission loss, load imbalance in peak and valley, etc. are all crucial in impacting the stability of power grid and transmission quality. 

The superconducting magnetic energy storage technology can store the excessive energy in the power grid and transmit it to the power grid if necessary to ensure the stability of power grid. It is more advantageous than traditional energy storage means, such as the battery storage, compressed air energy storage, pumped hydro energy storage, capacitive energy storage, flywheel energy storage, etc. In addition, superconducting magnetic energy storage can also be used as the energy storage device of solar energy and wind power, or shipboard power system to provide pulsed power supply for special equipment.

2. Values for Clients

 ⊙ Long-term energy storage without loss, no DC current joule heat loss in superconducting state 

 ⊙ Conductible electric current density is about 2 orders of magnitudes higher than the regular conducting windings 

 ⊙ The energy storage efficiency is as high as 95%, and the energy density may reach 108J/m3

 ⊙ Extremely fast response speed (tens of milliseconds)