CN-224233576-U - Control device and equipment of static frequency converter of gas turbine

CN224233576UCN 224233576 UCN224233576 UCN 224233576UCN-224233576-U

Abstract

The utility model provides a control device and equipment of a gas turbine static frequency converter, and relates to the technical field of gas turbine static frequency converters. The device comprises a start-stop loop, a gas turbine protection loop and a scram unit, wherein the start-stop loop and the gas turbine protection loop are connected in parallel, the scram unit is connected with the gas turbine protection loop, the start-stop loop comprises a normal start relay and a normal stop relay which are sequentially connected in series, the gas turbine protection loop comprises a high-disk mode relay and a gas turbine protection unit which are sequentially connected in series, the scram unit comprises a scram relay, scram coils of the scram relay are connected in the gas turbine protection loop in series, and contacts of the scram relay are connected with a static frequency converter. The utility model can solve the potential safety hazard problem caused by misjudgment of the static frequency converter of the gas turbine.

Inventors

LIU JUNHUA
SU LEI
SUN LIANG
LIU WEI

Assignees

深圳能源集团股份有限公司东部电厂

Dates

Publication Date: 20260512
Application Date: 20250415

Claims (10)

1. The control device of the static frequency converter of the gas turbine is characterized by comprising a start-stop loop and a gas turbine protection loop which are connected in parallel, and an emergency stop unit connected with the gas turbine protection loop; The start-stop loop comprises a normal start relay and a normal stop relay which are sequentially connected in series; the gas turbine protection loop comprises a high-disk mode relay and a gas turbine protection unit which are sequentially connected in series; The emergency stop unit comprises an emergency stop relay, an emergency stop coil of the emergency stop relay is connected in series in a fuel machine protection loop, and a contact of the emergency stop relay is connected with a static frequency converter.
2. The control device of a static frequency converter of a gas turbine according to claim 1, wherein the start-stop loop further comprises a start-up latching relay; the coil of the starting self-locking relay is connected in series in the starting and stopping loop and behind the contact of the normal stopping relay.
3. The control device of a static frequency converter of a gas turbine according to claim 2, wherein the normal start relay and the start self-locking relay are normally open relays; the normal stop relay is a normally closed relay.
4. The control device for a static frequency converter of a gas turbine according to claim 1, wherein said start-stop circuit further comprises a gas turbine protection relay; the contacts of the gas turbine protection relay are connected in series in a start-stop loop; The coil of the gas turbine protection relay is connected in series in the gas turbine protection loop and is connected in parallel with the scram coil.
5. The control device for a static frequency converter of a gas turbine according to claim 4, wherein said gas turbine protection relay is a normally open relay.
6. The control device for a static frequency converter of a gas turbine according to claim 1, wherein said gas turbine protection unit comprises a gas turbine main protection relay, an overspeed protection relay, and an emergency stop button relay.
7. The control device for a static frequency converter of a gas turbine according to claim 1, wherein said control device further comprises a turbine protection circuit; The gas turbine protection loop comprises a gas turbine protection unit; The gas engine protection loop further comprises a gas engine protection relay, the contact of the gas engine protection relay is connected with the contact of the Gao Panmo type relay in parallel, and the coil of the gas engine protection relay is connected in series in the gas engine protection loop.
8. The control device for a static frequency converter of a gas turbine according to claim 7, wherein said turbine protection relay is a normally open relay.
9. The control device for a static frequency converter of a gas turbine according to claim 7, wherein said turbine protection unit comprises a main protection relay of a gas turbine body, an overspeed protection relay, an emergency stop button relay, and a trip protection relay of a gas turbine.
10. Control device of a gas turbine static frequency converter, characterized by comprising a control device of a gas turbine static frequency converter according to any of claims 1 to 9.

Description

Control device and equipment of static frequency converter of gas turbine Technical Field The utility model relates to the technical field of gas turbine static frequency converters, in particular to a control device and equipment of a gas turbine static frequency converter. Background The gas-steam combined cycle unit is high-efficiency power generation equipment, and organically combines a gas turbine cycle and a steam turbine cycle to achieve higher energy utilization efficiency and power generation benefit. The unit includes a gas turbine (hereinafter referred to as a gas turbine) and a steam turbine (hereinafter referred to as a steam turbine). The SFC (static frequency converter Static Frequency Converter, abbreviated as SFC) of a gas turbine is a power electronic power supply device capable of providing simultaneous frequency and voltage changes. In the gas turbine, SFC is used as starting equipment to provide alternating power supply for the stator side of the generator end to drive the gas turbine to accelerate to self-sustaining speed. During the unit start-up phase, the SFC apparatus provides power to the generator, which becomes a synchronous motor. For example, the starting process of the whole unit can be roughly divided into a stage that the SFC device drags the unit to reach a certain rotating speed, the combustion engine is used for purging, cleaning and igniting the combustion system, acceleration is carried out after ignition, the SFC device exits after the gas turbine and the SFC device are combined to act together to rise to a self-sustaining speed of 2000rpm, and finally the self-sustaining speed rises to a rated rotating speed of 3000 rpm. The control device of the SFC is a control device that controls the SFC to execute the above-described operation. Existing SFC control devices include start-stop loops. The start-stop circuit is typically a hard circuit, including a normal stop relay. The on and off states of the start-stop loop serve as a signal source for controlling the SFC. When the normal shutdown relay is disconnected, the startup and shutdown loop loses power, and then the startup and shutdown loop can simultaneously send out a normal shutdown instruction and an emergency shutdown instruction, and then the two instructions are distinguished by the SFC. The SFC and SFC control devices may be manufactured by different manufacturers. SFCs from different vendors may respond preferentially to emergency shutdown instructions when they receive both instructions at the same time. This causes the control device to misjudge the normal shutdown instruction as an emergency shutdown instruction. For example, in a high-disc mode of the unit at 700rpm, an operator manually operates a normal stop to stop the SFC apparatus, a start-stop loop is opened, power is lost, and both a normal stop and an emergency stop are issued, with SFC responding preferentially to the emergency stop. When the emergency stop instruction is executed, the movable and fixed contacts of the excitation magnetic-killing switch of the unit are ablated and damaged, the service life is greatly reduced, the unit is damaged when serious, and potential safety hazards exist. Disclosure of utility model The embodiment of the utility model provides a control device and equipment for a static frequency converter of a gas turbine, which are used for solving the problem of potential safety hazards caused by misjudgment of the static frequency converter of the gas turbine. According to the first aspect, the embodiment of the utility model provides a control device of a gas turbine static frequency converter, which is used for controlling the static frequency converter, and comprises a start-stop loop and a gas turbine protection loop which are connected in parallel, and an emergency stop unit connected with the gas turbine protection loop, wherein the start-stop loop comprises a normal start relay and a normal stop relay which are sequentially connected in series, the gas turbine protection loop comprises a high-disk mode relay and a gas turbine protection unit which are sequentially connected in series, the emergency stop unit comprises an emergency stop relay, an emergency stop coil of the emergency stop relay is connected in the gas turbine protection loop in series, and a contact of the emergency stop relay is connected with the static frequency converter. In one possible implementation manner, the start-stop loop further comprises a start-up self-locking relay, wherein the contact of the start-up self-locking relay is connected with the contact of the normal start-up relay in parallel, and the coil of the start-up self-locking relay is connected in series in the start-stop loop and behind the contact of the normal stop relay. In one possible implementation, the normal start relay and the start self-locking relay are normally open relays, and the normal stop relay is a normally closed relay. In one possible implementation, the s