JP2001078361A - Flicker compensating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct flicker compensation of a plurality of flicker generation loads, installed to different buses in a system of the flicker compensation apparatus, without reduction in the flicker compensation effect and variation of installation bus of the flicker generating load. SOLUTION: A load 3 that generates flicker via a transformer 2 and a load 3A, that generates flicker via a transformer 2A, are installed to a power supply system 1. A flicker compensating apparatus 4 is installed to a bus connecting the tertiary coil of the transformer 2 and the tertiary coil of the transformer 2A and receives the signals for the purpose of control from the transformer 5 for detecting a current of the load 3 and from the transformer 5A for detecting a current of the load 3A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flicker compensator for compensating for voltage fluctuations and flicker.

[0002]

2. Description of the Related Art A flicker compensator is a device for compensating for flicker induced by irregular and steep reactive power fluctuations caused by a load such as an electric furnace. In general, a consumer having a load that generates flicker must suppress the flicker value to a flicker regulation value set by the electric power company.

A conventional flicker compensator will be described with reference to FIG. As shown in FIG. 2, a conventional flicker compensator 4 includes a flicker generating load 3 via a transformer 2 and a flicker generating load 3A via a transformer 2A.
Is installed. A flicker compensator 4 is installed on the secondary side of the transformer 2 to control signals of a current transformer 5 for detecting a current of the flicker generating load 3 and a current transformer 5A for detecting a current of the flicker generating load 3A. Has been received as. The flicker compensator 4 compensates for the reactive power, the negative-phase current, and the harmonics for the flicker generating load 3 installed on the same bus.

As for the flicker generating load 3A installed on a different bus line from the flicker compensating device 4, the transformer 2 and the transformer 2A having impedance are installed between the flicker generating load 3A and the flicker compensating device 4. In this case, only the reactive power can be compensated because the harmonic and the negative phase current cannot be compensated. In this way, one set of flicker compensating devices can perform flicker compensation for a plurality of flicker occurrence loads connected to different buses, but the flicker compensation content is limited.

[0005]

By the way, a plurality of flicker generation loads installed on different buses as described above are required.
When flicker compensation is performed by a set of flicker compensators installed on any of the buses, there is the following problem.

On the other hand, a flicker generating load on a bus different from that of the flicker compensating device is performed only by reactive power compensation. Therefore, the flicker compensating effect is reduced as compared with the case where the negative phase current compensation and the harmonic compensation are performed. is there.

[0007] Further, since the negative phase current compensation and the harmonics compensation are not performed on the bus without the flicker compensating device, the bus voltage fluctuates due to the negative phase current and the harmonics generated by the flicker generating load, which affects the operation of the load. Have a problem.

In order to solve the above-mentioned problems, the present invention provides a flicker compensator on a bus connecting a tertiary winding of a transformer so that the flicker compensator can reduce a plurality of flicker-generating loads. It will be installed on the line, and by compensating the reactive power, reverse phase current, and harmonics generated by each of the plurality of flicker generating loads, the flicker compensation effect can be reduced or the bus voltage of the flicker generating load installed The purpose is not to fluctuate.

[0009]

SUMMARY OF THE INVENTION Accordingly, in order to achieve the above object, the present invention provides a method for controlling a voltage fluctuation of a plurality of loads connected via transformers respectively connected to a plurality of buses connected to a power supply system. In a flicker compensator for performing compensation and flicker compensation, the flicker is connected to a bus connecting a tertiary winding of the transformer. Therefore, by installing the flicker compensator on the bus connecting the tertiary winding of the transformer, the flicker compensator is installed on each bus of the loads generating a plurality of flickers, and each of the plurality of loads is generated. It can compensate for reactive power, negative phase current, and harmonics.

Therefore, the flicker compensation effect is reduced by compensating the reactive power, the negative phase current, and the harmonics generated by each of the plurality of loads generating flicker, or the bus on which the load generating flicker is installed. It is possible to perform flicker compensation for a plurality of flicker occurrence loads installed on different buses with a single set of flicker compensating devices without changing the voltage.

[0011]

Embodiments of the present invention will be described below with reference to FIG. FIG. 1 shows a circuit diagram of a flicker compensator connected to a bus connecting a tertiary winding of a transformer.

As shown in FIG. 1, in the flicker compensator of the present embodiment, a load 3 that generates flicker through a transformer 2 and a load 3A that generates flicker through a transformer 2A are provided in a power supply system 1. is set up. A flicker compensator 4 is installed on a bus connecting the tertiary winding of the transformer 2 and the tertiary winding of the transformer 2A, and a current transformer 5 for detecting a current of the load 3 and a current transformer for detecting a current of the load 3A. Each signal of the device 5A is received for control.

Therefore, the conventional flicker compensator compensates for reactive power, negative-sequence current and harmonics for loads installed on the same bus, and can only compensate for reactive power for loads installed on different buses. On the other hand, according to the present embodiment, since the plurality of loads are installed on the same bus, the flicker compensation effect is reduced or the bus voltage at which the flicker generating load is installed is varied. Without this, it is possible to perform flicker compensation for compensating for the reactive power, negative-sequence current, and harmonics generated by each.

[0014]

As described above, according to the present invention, a plurality of flickers installed on different buses by one set of flicker compensator can be used without reducing the flicker compensation effect or changing the installation bus of the flicker generating load. The flicker of the generated load can be compensated.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a conventional flicker compensator.

[Explanation of symbols]

1: Power supply system, 2: Transformer, 2A: Transformer, 3, 3A ...
Load 4, flicker compensator.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keikichi Sato 1-1-1, Shibaura, Minato-ku, Tokyo F-term in the head office of Toshiba Corporation (reference) 5G066 FA01 FB11 5H420 BB02 BB14 CC04 DD03 DD05 EA27 FF04 FF26 LL01 LL04

Claims (1)

[Claims] 1. A flicker compensator for compensating voltage fluctuations and flicker of a plurality of loads connected via transformers respectively connected to a plurality of buses connected to a power supply system, wherein a tertiary winding of the transformer is provided. A flicker compensator, which is connected on a bus connecting the two.