Power distribution network power dispatching method and system based on source-load-network balance

Abstract

The invention discloses a power distribution network power dispatching method and system based on source-load-network balance. The method comprises the following steps: constructing a source-load network balance model and constraint conditions thereof; under the unit power transformation capacity, constructing a source-load-network balance target function by taking the minimized equivalent load fluctuation and the load peak-valley difference rate as targets; and under the constraint condition, solving the source-load-network balance objective function to obtain an optimal balance planning scheme under the unit power transformation capacity, thereby controlling the power generation capacity of the distributed power supply and the access capacity of the multi-element load in the power distribution network. According to the method and system, the output of the distributed power supply and the power balance of the multi-element load are comprehensively considered, the optimal access capacity of the distributed power supply and the multi-element load is obtained on the basis of achieving the integrated balance of the source, the network and the load, and the active planning of power distribution network power dispatching is achieved.

Description

technical field [0001] The invention relates to the technical field of distribution network power balance, in particular to a distribution network power scheduling method and system based on source-load-network balance. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] With the maturity of distributed generation technology, the cost of distributed generation is decreasing day by day, and the proportion of distributed generation in the power system is gradually increasing. The biggest difference between the high-proportion renewable energy power system and the conventional power system is that wind power and solar power are widely and large-scale connected to the power system, and the randomness and volatility of power generation cause the power system to face challenges. When distributed power is connected to the distribution network, it wi...

AI Technical Summary

Problems solved by technology

[0005]1) Impact distribution network planning analysis model

[0006]Different from traditional power sources, some distributed power sources use new energy to generate electricity (such as solar energy, wind energy), and their output power is limited by natural conditions and cannot provide stable output , so it cannot simply be considered as a traditional power supply

When considering the power balance of a power system with a high proportion of renewable energy, how to select the output scenarios of multiple renewable energy fields and how to characterize the output correlation; when considering system backup, if renewable energy is not taken into account, the installed capacity of conventional units Calculating backup will greatly reduce the economics of the planning scheme, and conventional units are limited by the minimum output, too many conventional units will also seriously affect the consumption of renewable energy; if renewable energy is taken into account, how to evaluate the renewable energy field Confidence capacity refers to the amount of capacity of each energy field when calculating the backup. When simulating the power balance of the system, due to the strong randomness and intermittent nature of the new energy output, it is difficult to predict the power generation of new energy by selecting typical scenarios.

[0007]2) Increasing the difficulty of load forecasting in distribution network planning

Since a large number of users will install distributed power to provide them with electricity, the load growth of the distribution network will be partially offset by the access of distributed power, making it more difficult for distribution network planners to accurately predict the growth of load, thus affecting subsequent planning.

[0009]3) The evaluation indicators of planning schemes need to be further improved. The access of high proportion of renewable energy and the construction of energy Internet make the evaluation index system of traditional transmission network planning schemes difficult. Be applicable

[0017]3) In the planning stage of distribution network power dispatching, there is often a lack of consideration of the actual operation strategy, which may easily lead to a disconnect between the planning result and the actual operation

Images