A joint control method of voltage and power flow in active distribution network considering operation cost

Abstract

The invention discloses a voltage and power flow combined control method considering running cost for an active power distribution network. The method comprises the following steps of: (1) automatically detecting / forecasting voltage and power flow in the network, and judging whether an overrun phenomenon occurs or not; (2) building a case library applicable for voltage control of the active power distribution network; (3) retrieving the case library by a nearest neighbor method in a case-based reasoning when the voltage of arbitrary one bus in the power distribution network is recognized to exceed the limit by the system, and searching out N voltage control methods with highest similarity, wherein N is an integer more than 1; (4) calculating a power flow constraint method by a constraint satisfaction algorithm when the power flow of arbitrary one circuit in the power distribution network is recognized to exceed the limit value by the system; (5) carrying out on-line simulation test on the control method; and (6) optimizing the running cost. By the embodiment of the invention, the safety margin requirement for running of the power distribution network is satisfied in real time, and the running reliability and activeness of the power distribution network is effectively improved; and meanwhile, guidance is provided for running and short-term planning of the power distribution network, and favorable economic benefit and social benefit are achieved.

Description

technical field [0001] The invention relates to a safe operation and preventive control method of an active distribution network. In particular, it relates to a joint voltage and power flow control method of an active distribution network considering operating costs. Background technique [0002] With the development of various new energy power generation technologies in recent years and the promotion of new loads such as electric vehicles, the penetration rate of distributed generation (DG) and new flexible loads in the distribution network continues to increase. The randomness and unpredictability of distributed energy resources pose new challenges to the operation and control of distribution networks, among which voltage fluctuations and two-way power flow problems are particularly prominent. [0003] At this stage, the existing distribution network control and management system cannot fully adapt to the above changes, and can only passively accept DG by combining local ...

AI Technical Summary

Problems solved by technology

[0010] 1. The voltage flow control is often passive whether it is in normal operation or in an emergency, and cannot provide sufficient early warning for the safety of the system operation, which does not meet the development needs of today's active distribution network;

[0011] 2. The current distribution network voltage flow control target is single, which cannot fully take into account a large number of external uncertain factors during the operation of the distribution network, which in turn leads to potential safety hazards in the operation of the system;

[0013] 4. The current distribution network voltage flow control mostly uses the objective function of minimizing loss or the highest access rate of distributed power generation, ignoring the consideration of distribution network operators on operating costs

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