CN209250249U

CN209250249U - A kind of automatic back brake system of transformer based on STATCOM

Info

Publication number: CN209250249U
Application number: CN201821719911.XU
Authority: CN
Inventors: 徐连洲; 何师; 张海涛
Original assignee: BEIJING RONGXIN HUIKE TECHNOLOGY Co Ltd
Current assignee: BEIJING RONGXIN HUIKE TECHNOLOGY Co Ltd
Priority date: 2018-10-23
Filing date: 2018-10-23
Publication date: 2019-08-13
Anticipated expiration: 2028-10-23

Abstract

The utility model provides a kind of automatic back brake system of the transformer based on STATCOM, including the first transformer SGT1, the second transformer SGT2, the first circuit breaker Q F1, the second circuit breaker Q F2 and STATCOM device；The feeder ear of STATCOM device is connected on the low-voltage power supply bus.The signal output end of first transformer SGT1 and the second transformer SGT2 connect the signal input part of the STATCOM controller of STATCOM device, the control terminal of output end connection the first circuit breaker Q F1 and the second circuit breaker Q F2 of the STATCOM controller, by STATCOM controller by the on-off of control the first circuit breaker Q F1 and the second circuit breaker Q F2 to which the back brake of control the first transformer SGT1 and the second transformer SGT2 switches.Using STATCOM control technology, it can be achieved that after main transformer fault trip, STATCOM is automatically switched into spare transformer, guarantees that STATCOM is continually and steadily run.It solves the problems, such as the offline downtime length of STATCOM existing for traditional manual switching grid switching operation mode, manual operation low efficiency, improves the safety and stability of operation of power networks.

Description

A kind of automatic back brake system of transformer based on STATCOM

Technical field

The utility model relates to reactive power compensation technology field, in particular to a kind of transformer based on STATCOM falls automatically Brake system.

Background technique

Reactive-load compensation equipment STATCOM be applied to power grid in, can real-time detection electric network state, quickly adjust output dynamic Reactive power has the function of to improve multi-line power transmission stability, compensation system reactive power, improve grid stability etc..To ensure Power system security is stablized, and STATCOM needs long-term, continual and steady operation.Pivot of the transformer as STATCOM access power grid Knob decides that can the reactive power of STATCOM output flow into power grid and STATCOM and play a role.

The transformer back brake system of the prior art generally uses and manually controls back brake, or using based on such as PLC controller Deng automatic back brake, in this kind of back brake system, STATCOM does not participate in the control of back brake directly, so that following technology be caused to lack It falls into:

1) on the one hand, if transformer breaks down, it will lead to STATCOM tripping grinder；

2) on the other hand, electric power O&M department also results in STATCOM to the annual test and maintenance of transformer and shuts down, and increases electricity Net security risk.

Therefore, traditional back brake mode there are low efficiency, the offline downtime of STATCOM is long the problems such as, power grid security is deposited In hidden danger.

Summary of the invention

In order to solve the problems, such as described in background technique, it is automatic that the utility model provides a kind of transformer based on STATCOM Back brake system automatically switches to STATCOM by using STATCOM control technology, it can be achieved that after main transformer fault trip Spare transformer guarantees that STATCOM is continually and steadily run.The present invention solves existing for tradition switching grid switching operation mode The problem of offline downtime length of STATCOM, manual operation low efficiency, improve the safety and stability of operation of power networks.

In order to achieve the above object, the utility model is implemented with the following technical solutions:

A kind of automatic back brake system of transformer based on STATCOM, including the first transformer SGT1, the second transformer SGT2, the first circuit breaker Q F1, the primary end connection of the second circuit breaker Q F2, the first transformer SGT1 and the second transformer SGT2 are high Bus is pressed, the first transformer SGT1 secondary terminals are connected on low-voltage power supply bus by the first circuit breaker Q F1, the second transformer SGT2 secondary terminals are connected on low-voltage power supply bus by the second circuit breaker Q F2.

It further include STATCOM device；STATCOM device includes STATCOM controller and STATCOM power cell, The feeder ear of STATCOM power cell is connected on the low-voltage power supply bus.

The signal output end of first transformer SGT1 and the second transformer SGT2 connect the signal input of STATCOM controller End, the control terminal of signal output end connection the first circuit breaker Q F1 and the second circuit breaker Q F2 of the STATCOM controller, STATCOM controller is by the on-off of control the first circuit breaker Q F1 and the second circuit breaker Q F2 to the first transformer SGT1 of control Switch with the back brake of the second transformer SGT2.

The output signal of the first transformer SGT1 and the second transformer SGT2 include transformer state signal VT- The fault-signal PRE-TRIP of LIVE and transformer.

Breaker STATCOM_ is also in series between the feeder ear and low-voltage power supply bus of the STATCOM power cell CB and reactor L.

Compared with prior art, the utility model has the beneficial effects that

1, the automatic back brake system of a kind of transformer based on STATCOM of the utility model solves tradition switching back brake The problem of offline downtime length of STATCOM existing for mode of operation, manual operation low efficiency, improve the safety of operation of power networks Property and stability.

2, it controls by using STATCOM, it can be achieved that after main transformer fault trip, STATCOM automatically switches to standby It is continual and steady to run with transformer, safeguard power system security.

Detailed description of the invention

Fig. 1 is the automatic back brake system topology figure of the utility model transformer；

Fig. 2 is a kind of STATCOM power cell circuit structure diagram of the prior art；

Fig. 3 is a kind of circuit structure diagram of STATCOM controller of the prior art.

Specific embodiment

Specific embodiment provided by the utility model is described in detail below.

As shown in Figure 1, a kind of automatic back brake system of transformer based on STATCOM, including the first transformer SGT1, second Transformer SGT2, the first circuit breaker Q F1, the second circuit breaker Q F2, the primary end of the first transformer SGT1 and the second transformer SGT2 High voltage bus is connected, the first transformer SGT1 secondary terminals are connected on low-voltage power supply bus by the first circuit breaker Q F1, and second becomes Depressor SGT2 secondary terminals are connected on low-voltage power supply bus by the second circuit breaker Q F2.

In the prior art, STATCOM device includes STATCOM power cell and STATCOM controller, as shown in Fig. 2, being A kind of circuit diagram of STATCOM power cell in the prior art.

The STATCOM controller is the controller in the prior art using STATCOM system.As shown in figure 3, being A kind of circuit diagram of STATCOM controller disclosed in the prior art.STATCOM controller, which is generally equipped with, to be opened into (DI) and opens (DO) interface out, STATCOM controller are defeated by the signal that DI interface connects the first transformer SGT1 and the second transformer SGT2 Outlet, STATCOM controller connect the control terminal of the first circuit breaker Q F1 and the second circuit breaker Q F2 by DO interface.

Breaker STATCOM_ is also in series between the feeder ear and low-voltage power supply bus of the STATCOM power cell CB and reactor L.In Fig. 1, Current Transmit 1 and CT2 are also in series with before and after reactor L, for detecting the electric current of route Value.It is also equipped with voltage transformer pt 1 on low-voltage power supply bus in Fig. 1, for detecting line voltage value.STATCOM_CB is disconnected The high pressure complex protection device that the on-off of road device is routinely configured by substation controls its on-off, and the switching that on-off control process is seen below is former The narration of reason.

See Fig. 1, the present embodiment topological structure of electric is by taking 400kV/15.5kV as an example, based on transformer SGT1, transformer For SGT2 as spare, STATCOM puts into power grid operation by transformer SGT1, provides reactive power support for power grid, practical Novel active and standby transformer switching principle is as follows:

1) when main transformer SGT1 breaks down, transformer SGT1 issue fault tripping signal PRE-TRIP, and by this Signal is sent to STATCOM controller, after the DI interface to signal PRE-TRIP of STATCOM controller, judges spare change Whether the state VT-LIVE of depressor SGT2 is abnormal.

If 2) the state VT-LIVE abnormal signal of transformer SGT2, spare transformer SGT2 there are failure, belong to from Linear state is unsatisfactory for transformer and automatically switches condition, then STATCOM shutdown trip.

If 3) the state VT-LIVE signal of transformer SGT2 is normal, meets transformer and automatically switch condition, then STATCOM is latched immediately, no longer exports reactive current to power grid, and return to initial STOP shutdown status.Certainly due to STATCOM Body is actively out of service, so any failure and alarm will not be generated.

4) after STATCOM is shut down, the fault tripping signal that failure transformer SGT1 is issued is sent to integrated protection simultaneously and sets It is standby, after integrated protection equipment receives significant level signal, separate the main incoming breaker STATCOM_CB of STATCOM.

5) STATCOM controller DO interface issue the QF1 separating brake order of main transformer SGT1 outlet breaker, by SGT1 with 15.5kV bus separates.

If 6) meet switching condition, STATCOM controller DO Interface Controller SGT2 outlet breaker QF2 is after the delay It closes a floodgate, so far, 15.5kV primary equipment power switching is completed, and 15.5kV bus is powered by transformer SGT2.

Topological structure of electric described in the present embodiment is not limited to the voltage class by taking 400kV/15.5kV as an example, may be used also Think other voltage class.The present embodiment is based on transformer SGT1, and transformer SGT2 is as spare.If with transformer SGT2 Based on, SGT1 is equally applicable as spare.

Above embodiments are implemented under premised on technical solutions of the utility model, give detailed embodiment With specific operating process, but the protection scope of the utility model is not limited to the above embodiments.Side used in above-described embodiment Method is conventional method unless otherwise instructed.

Claims

1. a kind of automatic back brake system of transformer based on STATCOM, including the first transformer SGT1, the second transformer SGT2, The primary end of first circuit breaker Q F1 and the second circuit breaker Q F2, the first transformer SGT1 and the second transformer SGT2 is connected to high pressure Bus, the first transformer SGT1 secondary terminals are connected on low-voltage power supply bus by the first circuit breaker Q F1, the second transformer SGT2 Secondary terminals are connected on low-voltage power supply bus by the second circuit breaker Q F2；

It is characterized in that, further including STATCOM device；STATCOM device includes STATCOM controller and STATCOM power list Member, the feeder ear of STATCOM power cell are connected on the low-voltage power supply bus；

The signal output end of first transformer SGT1 and the second transformer SGT2 connect the signal input part of STATCOM controller, The control terminal of signal output end connection the first circuit breaker Q F1 and the second circuit breaker Q F2 of the STATCOM controller, STATCOM controller is by the on-off of control the first circuit breaker Q F1 and the second circuit breaker Q F2 to the first transformer SGT1 of control Switch with the back brake of the second transformer SGT2.

2. the automatic back brake system of a kind of transformer based on STATCOM according to claim 1, which is characterized in that described The first transformer SGT1 and the output signal of signal output end of the second transformer SGT2 include transformer state signal VT- The fault-signal PRE-TRIP of LIVE and transformer.

3. the automatic back brake system of a kind of transformer based on STATCOM according to claim 1, which is characterized in that described STATCOM power cell feeder ear and low-voltage power supply bus between be also in series with breaker STATCOM_CB and reactor L.