Flexible interconnection type power distribution control and electric energy quality management method

Abstract

The invention discloses a flexible interconnection type power distribution control and electric energy quality management method which comprises the following steps of: constructing a flexible interconnection type low-voltage power distribution network based on a BTB-VSC, and carrying out active power compensation on the voltage at the tail end of a line; analyzing the voltage-power sensitivity to obtain the effectiveness of an active power compensation strategy; and based on the effectiveness analysis result of the active power compensation strategy, constructing a BTB-VSC voltage control strategy taking realizing the consistency of the tail end voltage as a target, and completing flexible interconnection type power distribution control and electric energy quality management. The design capacity of a power distribution feeder is fully utilized, the feeder load balance degree and the tail end voltage quality are improved, and the absorption capacity of the low-voltage power distribution feeder to a distributed power supply is enhanced.

Description

Technical field [0001] The present invention relates to the technical field of distribution network, in particular, to a flexible interconnect distribution control and a power quality governance method. Background technique [0002] The traditional low-voltage AC distribution network is a radiocarbon structure of power unidirectional flow, and a typical grid can lead a plurality of 380V low-voltage distribution feeders through a plurality of 10kV / 380KV distribution transformers. Due to the problem of electromagnetic loop network, each feeder is not interconnected, and the feed line power is flowed from the substation bus side to the load side, thereby supplying the user to the user, the radiation distribution grid structure is simple, easy to protect, and the construction cost is low. [0003] Renewable energy (photovoltaic, wind power), etc. can be implemented in parallel by distributed power supply. Distributed power supplies are highly affected, with strong randomness and vo...

AI Technical Summary

Problems solved by technology

OLTC adjusts the voltage at the head end of the line by changing the taps of the distribution transformer, thereby realizing the indirect control of the voltage at the end of the feeder and the load power of the feeder. This scheme is simple in control and low in cost, but the control performance is poor, the adjustment range is small, and the voltage cannot be achieved. Continuous adjustment; reactive power compensation equipment can be configured at the end of the line, and the terminal voltage quality can be improved through reactive power compensation, but this solution requires a high capacity of reactive power compensation equipment, which will greatly increase equipment costs; load shedding / power reduction operation At the cost of sacrificing the power supply of some users or reducing the power generated by renewable energy, voltage regulation cannot be performed as a conventional method; line expansion requires a large investment in cables and transformer equipment, which is not economical

Images