Novel transmission loss reducing method by alternating current or direct current (AC / DC) synergy used in interconnected network and novel transmission loss reducing system by AC / DC synergy used in interconnected network

Abstract

The invention discloses a novel transmission loss reducing method by alternating current or direct current (AC / DC) synergy used in an interconnected network and a novel transmission loss reducing system by the AC / DC synergy used in the interconnected network. The method comprises the steps of acquiring load flow interface data and carrying out load flow calculation to acquire a load flow result, acquiring DC power data and calculating a DC transmission loss sensitivity factor according to the acquired DC power value; calculating an AC transmission loss sensitivity factor according to the load flow result, calculating a general transmission loss sensitivity factor of an AC / DC network according to the DC transmission loss sensitivity factor and the AC transmission loss sensitivity factor, judging whether the AC / DC network meets requirements of an optimal solution, carrying out iteration optimizing calculation to the AC / DC network if the AC / DC network does not meet the requirements of the optimal solution; finishing the iteration optimizing calculation and saving the current DC power value of the AC / DC network if the AC / DC network meets the requirements of the optimal solution, and carrying out the iteration optimizing calculation to the AC / DC network to adjustment the DC power of the AC / DC network in real time. The method supports on-line calculation, and calculation is accurate, fast and strong in robustness. The novel transmission loss reducing method by the AC / DC synergy used in the interconnected network and the novel transmission loss reducing system by the AC / DC synergy used in the interconnected network can be widely used in transmission loss optimizing of big AC / DC interconnected networks.

Description

technical field [0001] The invention relates to the field of network loss optimization of electric power systems, in particular to a method and a system for reducing network loss through a new type of AC and DC synergy in an interconnected power grid. Background technique [0002] With the development of modern power grids, power transmission methods are more diverse, and power systems are becoming more and more complex. At the same time, with the development of the economy, under the premise of ensuring the safety and stability of the power grid system, improving the economy of system operation has been placed in an increasingly important position. Network loss is an important part of power grid economic operation management. It not only reflects the rationality of power grid structure and operation arrangement, but also reflects the technical level and management level of power grid enterprises. [0003] The network loss in the power system refers to the energy lost on th...

AI Technical Summary

Problems solved by technology

Since the voltage of the AC transmission channel varies with the configuration of the reactive devices along the line, it is very inaccurate to use a voltage equivalent

Moreover, the resistance of the channel is closely related to the wiring mode of the transmission channel, the maintenance and outage of the line, and it is difficult to make an equivalent value for it

In addition, the current loss coefficient method cannot meet the requirements of offline calculations, let alone the requirements, speed and accuracy of online calculations

[0007] 2) The AC loss coefficient cannot accurately describe the influence of different sending ends on the power flow distribution of the AC channel

[0008] 3) The AC transmission channel is a huge multi-input and multi-output port network, so the loss coefficient of the AC channel is affected by other power transmission plans occupying the AC channel at the same time, and it is difficult to calculate accurately

[0009] 4) The AC loss coefficient method is difficult to optimize the network loss of the entire network. For example, the inter-provincial AC and DC network generally only considers the network loss outside the AC outlet of each province, and does not consider the 500kV lines in the province caused by power transmission. loss, so that the network loss of the entire network cannot be optimized

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