Reactive compensation method for countryside electric network

Abstract

The invention belongs to the field of power grid reactive power compensation, and in particular relates to a reactive power compensation method suitable for rural power grids in my country. Its characteristics are: in the load center area close to the load side of the 10KV main line, a large-capacity reactive power compensation device is arranged, and its compensation capacity is determined according to the total reactive power demand of the load center and the reactive power demand of the adjacent loads on the power supply side. The total amount is 200kvar ~ 1000kvar, and reactive power feedback is allowed. On each 10KV trunk line, 1 to 4 compensation points are set according to the number and distribution of load centers. The present invention may be referred to as "central proximity compensation". Due to the large-capacity centralized compensation, the number of compensation equipment is small, the investment is small, the management and maintenance are convenient, and the compensation equipment does not need to be switched frequently, so the operation is reliable; because the compensation point is close to the load side, the compensation effect is good and the line loss is effectively reduced. rate, so it can be used as the main compensation method for the promotion and application of rural power grids in my country.

Description

technical field [0001] The invention belongs to the field of power grid reactive power compensation, and in particular relates to a reactive power compensation method suitable for rural power grids in my country. Background technique [0002] The grid structure of the power distribution part of the rural power grid in my country at this stage is: the power supply is a 35KV / 10KV or 110KV / 10KV substation, and there are about 3 to 8 outgoing lines, which are sent to farmers through 10KV high-voltage distribution lines and dozens of 10KV / 0.4KV transformers. Electricity. [0003] Compared with urban power grids, my country's rural power grids have the following characteristics: [0004] 1. The load of farmers is relatively scattered, the load density is low, and the distribution transformer capacity is mostly between 30KVA and 300KVA; [0005] 2. Taking the county as the unit, a county-level power bureau has jurisdiction over 3 to 10 rural substations, 10 to 30 10KV outgoing lin...

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Problems solved by technology

[0006] 3. The seasonality, climate and day and night of the load vary greatly, and the peak load during busy farming may be more than ten times greater than the low-peak load during slack farming;

[0007] 4. The power distribution facilities are relatively backward, and the reactive power compensation is lacking. The power factor of its power transmission is low, which is 0.7-0.8, and the 10KV line loss rate is about 10%-18%.

The disadvantage is that there are too many compensation points, which consumes investment, is difficult to maintain, and has poor cost performance

[0012] Therefore, the existing compensation methods are not suitable for promotion in rural power grids

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