CN112596493A

CN112596493A - Excitation controller test system for gas turbine generator set

Info

Publication number: CN112596493A
Application number: CN202011398514.9A
Authority: CN
Inventors: 张一朦; 赵春雨; 姜东泽; 张吉冬
Original assignee: Shenyang Aerospace Xinguang Group Co Ltd
Current assignee: Shenyang Aerospace Xinguang Group Co Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-04-02

Abstract

The invention provides a test system and a use method of an excitation controller of a gas turbine generator set, wherein the test system comprises a vehicle body transportation structure component and a measured gas supply structure component, wherein the vehicle body transportation structure component comprises a bottom plate platform, universal wheels arranged at the lower part of the bottom plate platform and a gas cylinder bracket fixed on the bottom plate platform; the gas supply measuring structural component is a gas cylinder arranged on the gas cylinder bracket and a connecting pipeline between the gas cylinder and the product storage box, and a stop valve, a pressure sensor and a pressure reducing part are arranged in the pipeline. The device has the advantages that each part has compact structure, the parts are connected by the pipeline and the joint, the disassembly is convenient, the transportation is convenient, the device can be modified according to different test conditions, the sensor with corresponding range is replaced, corresponding test equipment is added, and pressure and temperature information is fed back to an operator in the test process, so that the operator can know the real-time pressure state in time, the working efficiency is improved, and the working intensity of workers is reduced.

Description

Excitation controller test system for gas turbine generator set

Technical Field

The invention belongs to the technical field of gas turbine generator sets, and particularly relates to a test system for an excitation controller of a gas turbine generator set.

Background

The gas turbine generator set is an independent power supply system of certain weapon equipment, and the stable and reliable work of the gas turbine generator set plays a crucial role in the quality of power supply, so that the working state of the gas turbine generator set is mastered in time, and various parameters of the gas turbine generator set are accurately detected, and the gas turbine generator set is a precondition for reliable operation. The excitation controller is an indispensable part of the generator, has the function of ensuring to finish the quality of the output electric energy of the generator, outputs corresponding instruction signals when performing self-checking and detecting input electric parameters (voltage, frequency, insulation resistance and the like), and realizes the functions of regulating, limiting protection and detecting and judging faults required by various operation modes, thereby ensuring the stability of a power supply system.

The weapon system in active service in China is long in introduction time, and with the increase of the service period of the weapon system, the aging rate of devices is high, and the failure rate of an excitation controller is higher and higher. The original test means is manual test, and the automatic test device does not have the automatic control and detection capability, when the test quantity is large, the test efficiency depending on manual operation is low, the test result is not high in reliability depending on the intuition of an operator, and the maintenance efficiency and accuracy of the part are seriously influenced.

Disclosure of Invention

In order to solve the problems, the invention provides a test system for an excitation controller of a gas turbine generator set, which is used for rapidly positioning a fault point and taking corresponding measures to protect when the excitation controller fails. The traditional manual test is converted into digital detection, and the purpose of improving the test reliability is achieved through the automatic interpretation of test data.

The technical scheme adopted by the invention is as follows: a test system for the exciting controller of gas turbine generator set is composed of hardware unit and software unit, which is used to disconnect the exciting controller from generator, and to utilize the power supply of test system to simulate the output of generator and the exciting voltage of generator.

The generator simulated by the test system is a certain type of gas turbine generator set, adopts a brushless intermediate frequency synchronous generator, is in a three-machine brushless excitation mode, and consists of an auxiliary exciter, a main exciter and a generator. The generator is a rotating magnetic pole type synchronous generator, the main exciter is a rotating armature type synchronous generator, and the auxiliary exciter is a rotating magnetic pole type permanent magnet synchronous generator. The three generators are coaxially operated and integrated together, and a rotary rectifier is arranged on a rotor of the main exciter. When a certain type of gas turbine generator set operates, alternating current generated by an armature of a main exciter is directly rectified by a rotating rectifier and then supplies power to a generator excitation winding, an auxiliary exciter specially supplies power to an excitation controller and a control protection circuit, and the excitation controller indirectly adjusts the excitation current of the main generator by controlling the excitation current of the auxiliary exciter, so that the purpose of adjusting output voltage is achieved.

Further optimizing, the test system provides four power supply simulation generator excitation voltage outputs; firstly, a voltage-stabilizing direct-current power supply is adopted to replace a control system of a gas turbine generator set to provide a power supply and an instruction control power supply for an excitation controller; secondly, a No. 1 static variable frequency power supply is used as an excitation power supply, and a power supply signal provided by an auxiliary exciter for an excitation controller is simulated; thirdly, simulating three-phase alternating current output by the synchronous generator by using a No. 2 static variable frequency power supply; fourthly, the No. 3 static variable frequency power supply is adopted to simulate a main exciter to provide current feedback for the synchronous generator, so that the size of the exciting current of the generator is controlled, and the output voltage of the generator is controlled.

Further optimizing, the test system adopts the analog quantity acquisition module for measuring and acquiring direct current voltage and current signals in real time, the isolation between each channel of signals is realized by adopting linear optical coupling isolation, and the signal measurement adopts a multi-channel 24-bit high-precision AD measurement chip to realize the universal detection of alternating current and direct current signals.

And further optimizing, wherein the software design of the test system adopts a graphical software LabVIEW programming language as a development environment of the measurement and control system, and the main functions of the test system comprise data acquisition, real-time display, automatic storage, playback, analysis and automatic judgment, power supply voltage and frequency control, alarm and error display, and automatic control of the test process and steps. The design is simple, the human-computer interaction interface is friendly, and the function is strong.

Further optimization, the voltage-stabilizing direct-current power supply is 24V direct current; the No. 1 static variable frequency power supply is 27V and 800 Hz; the No. 2 static variable frequency power supply is 127V, 400 HZ; the No. 3 static variable frequency power supply is 9.5V and 400 HZ.

Further optimizing, four power supplies all adopt the program control mode, completely by host computer monitoring mode, use RS232 serial port card, MODBUS RTU standard communication, adopt USB to change serial port module, direct and supervisory control computer communication. And serial communication and isolation technology with extremely high reliability is adopted, so that reliable work is ensured.

Further optimize, relay I/O module is for using RS485 MODBUS RTU standard communication, has 10 relay outputs, 12 switching value state collection, simple to operate, reliability height.

Further optimization, the test system can synchronously execute a plurality of tasks including a direct current power supply control program, a 400HZ variable frequency power supply control program, an 800HZ variable frequency power supply program, a data acquisition module program and a relay control module program, and the tasks are not interfered with each other. The program applies the multithreading technology, so that a plurality of independent tasks are executed concurrently, and the efficiency of the program is greatly improved.

The invention has the beneficial effects that: the invention completes the technical research of maintenance and guarantee on-line test of the excitation controller based on the gas turbine generator set, meets the capabilities of quickly positioning the component-level faults on line and automatically judging and reading the test result when weapon equipment is maintained on site, improves the technical capability of the equipment guarantee technical maintenance on site, improves the test reliability, improves the working efficiency and reduces the working intensity of workers through automatic judgment of test data.

Drawings

FIG. 1 is a schematic diagram of a generator excitation system;

FIG. 2 is a block diagram of the overall design of a gas turbine generator set excitation controller test system;

FIG. 3 is a software overall design diagram of a gas turbine generator set excitation controller test system.

Detailed Description

The invention relates to a test system for an excitation controller of a gas turbine generator set, and the technology of the invention is further specifically explained in conjunction with figures 1-3.

As shown in fig. 1, a generator excitation system is a schematic diagram, and an excitation control system generally comprises an excitation system and an excitation controller. The excitation system is used to provide a dc current to the field windings of the generator to create a dc magnetic field. The excitation controller is used for adjusting the excitation current in normal operation or in accidents so as to meet the operation requirement, and comprises an excitation adjuster, forced excitation, forced demagnetization, automatic demagnetization and the like. A certain type of gas turbine generator set adopts a brushless intermediate frequency synchronous generator, and is a three-machine type brushless excitation mode. The three-machine brushless synchronous generator is the most important one in the brushless excitation mode and consists of an auxiliary exciter, a main exciter and a generator. The generator is a rotating magnetic pole type synchronous generator, the main exciter is a rotating armature type synchronous generator, and the auxiliary exciter is a rotating magnetic pole type permanent magnet synchronous generator. The three generators are coaxially operated and integrated together, and a rotating rectifier is arranged on a rotor of the main exciter. When the micro gas turbine generator set runs, alternating current generated by an armature of the main exciter is directly rectified by the rotary rectifier and then supplies power to a generator excitation winding, the auxiliary exciter specially supplies power to the excitation controller and the control protection circuit, and the excitation controller indirectly adjusts the excitation current of the main generator by controlling the excitation current of the auxiliary exciter, so that the purpose of adjusting the output voltage is achieved.

The excitation controller has the following main functions:

(1) maintaining generator terminal voltage

Under normal generator operating conditions, the field controller should maintain the generator-side (or designated control point) voltage at a given level. Usually, when the load of the generator changes, the voltage at the generator terminal will change, and at this time, the excitation control system will automatically increase or decrease the excitation current of the generator, so that the voltage at the generator terminal is maintained at a certain level, and a certain voltage regulation precision is ensured. When the unit is used for load shedding, the terminal voltage is limited not to be excessively increased through the adjusting action of the excitation controller. Maintaining the generator-side (or designated control point) voltage at a given level is the most fundamental and important requirement of the excitation controller.

(2) Rational distribution of reactive power between generators operating in parallel

When the generator is loaded with an inductive load, the armature reaction has a demagnetizing effect, and then in order to maintain the generator terminal voltage constant, the exciting current must be increased to compensate the influence of the armature reaction. It follows that the regulation of the reactive power is dependent on the variation of the excitation current.

(3) Improving stability of power systems

The stability problems of the power system can be classified into three types: static stability, transient stability, and dynamic stability. A good excitation control system plays a role in improving the three types of stability. When the amplification factor of the excitation control system is large, the static stability of the generator can be improved, but under the conditions of long distance and heavy load, negative damping is easy to generate, and the dynamic characteristic of the system is deteriorated.

The excitation controller carries out logic judgment according to operation and state signals input on site, and realizes the functions of regulation, limiting protection and detecting and judging faults required by various operation modes.

The fault protection items in the gas turbine generator set mainly comprise:

(1) feeder or generator failure "

When the over-current, output phase loss or phase sequence error of the generator set is detected, the specified test port sends out the fault signal.

1) Phase loss: and detecting the phase loss of the output voltage of the generator set.

2) Phase dislocation: and detecting the output error phase sequence of the generator set.

3) Short-circuiting: when the phase difference of the zero crossing point of the three-phase voltage is not within the range of 120 +/-2 degrees or the no-load voltage is 105% of rated voltage, the inter-phase short circuit time of the feeder line of the generator set exceeds 0.6 s.

4) Insulation resistance reduction: the insulation resistance of the alternating current circuit to the ground is lower than 15k omega +/-5 k omega, and the continuous time is 0.4-0.7 s.

(2) Frequency lower than standard value "

When the AC frequency is lower than (365 +/-5) Hz, the specified core point of the test port sends out the fault signal, so that the protection is irreversible.

(3) Frequency higher than standard value "

When the AC frequency is higher than (423 +/-3) Hz, the specified core point of the test port sends out the fault signal.

(4) "too high frequency"

When the AC frequency is higher than (480 +/-8) Hz, the alarm signal is sent out by the specified core point of the test port.

(5) Small insulation resistance "

When the insulation resistance of the feed line of the intermediate frequency generator to the ground is reduced to (60 +/-20) k omega, an alarm signal is generated.

(6) Excitation controller fault "

The excitation controller detects the occurrence of self-fault alarm; and a specified core point of the test port outputs an excitation control system fault signal.

1) Line voltage rise

When the rated voltage is 208V, the line voltage exceeds (228-248) V, and the duration is (0.4-0.7) s.

When the rated voltage is 220V, the line voltage exceeds (241-256) V, and the duration is (0.4-0.7) s.

2) Line voltage reduction

When the rated voltage is 208V, the line voltage is lower than (171-182) V and lasts for (3.1-4.6) s.

When the rated voltage is 220V, the line voltage is lower than (181-193) V and lasts for 3.1-4.6 s.

3) Current overload: the overload of any phase current value is larger than (2.4-3.0) IH (load current), and the duration is (4 +/-0.6) s.

4) Energizing the excitation controller for self-checking, wherein the self-checking time is not more than 0.5 s; and self-checking is carried out in the running process, the self-checking is carried out once every 10s, the self-checking time is not more than 0.5s every time, and an alarm signal is output when Z is detected.

For the non-volatile fault signal, the internal of the excitation controller has a storage function, the last fault signal is recorded, the power failure is kept, the fault signal is output at the corresponding output terminal when the power is re-electrified, and when a fault clearing instruction is received, each fault signal is reset, and the memory is cleared.

The invention realizes the acquisition of AC/DC signals through the analog quantity acquisition module of DC voltage and current signals. Through software design of a test system, a fault signal is compared with a non-fault state value to obtain fault information, and the fault information is displayed, automatically stored, replayed, analyzed and automatically judged in real time to achieve the purpose of automatic interpretation of the test. Power supply voltage and frequency control, alarm and error display, and automatic control of the test process and steps.

The relay I/O module is used for realizing 10 paths of relay output and 12 paths of switching value state acquisition, and performing operations such as load connection, fault clearing, fault protection, frequency high prohibition, frequency low prohibition and insulation resistance low prohibition.

As shown in fig. 2, in the test system for the excitation controller, the excitation controller is disconnected from the generator, the power supply of the test board is used to simulate the output of the generator and the output of the excitation voltage of the generator, various fault signals are artificially set, the input and elimination control of the fault signals is controlled by the relay I/O module, and the fault signals are applied to the input loop of the control system, so that the inspection of the overvoltage, overcurrent, underfrequency and other protection functions of the excitation control system is realized, whether the various protection functions of the excitation control system meet the technical specification requirements is verified, and meanwhile, the fault signals reported by the excitation system in various working modes of the unit are verified:

a voltage-stabilizing direct-current power supply (24V direct current) is adopted to replace a control system of a gas turbine generator set to provide a power supply and an instruction control power supply for an excitation control system;

the No. 1 static variable frequency power supply provides 27V and 800Hz power supply which is used as an excitation power supply and simulates a power supply signal provided by an auxiliary exciter for an excitation system;

the No. 2 static variable frequency power supply 2 provides 127V and 400HZ power supply and simulates three-phase alternating current output by a synchronous generator;

the No. 3 static variable frequency power supply 3 provides 9.5V and 400HZ power supplies, and the simulation main exciter provides current feedback for the synchronous generator to realize control of the size of the excitation current of the generator, so that the output voltage of the generator is controlled;

RS232 serial port cards and MODBUS RTU standard communication are used, and a USB-to-serial port module is adopted to directly communicate with a monitoring computer.

As shown in fig. 3, during maintenance, the output of the programmable power supply is set as required, input is provided for the excitation controller, the output signal of the excitation system is tested through test software, different control signals are given, the output information of the excitation control system is collected, fault information is judged, and a fault point is located. When the test is carried out, the test software is used for controlling the output signal of the program-controlled power supply, simulating different running states of the unit and monitoring the output state of the excitation system so as to judge the performance condition of the excitation controller.

Claims

1. The utility model provides a gas turbine generating set excitation controller test system which characterized in that: the method comprises a hardware part and a software part, wherein an excitation controller is disconnected from a generator, the output of the generator and the output of the excitation voltage of the generator are simulated by using a power supply of a test system, various fault signals are artificially set, the input and elimination control of the fault signals are controlled by a relay I/O module and are applied to an input loop of a control system, the check of the protection functions of the excitation controller, such as overvoltage, overcurrent and under-frequency, is realized, the check of the protection functions of the excitation controller is verified to determine whether the various protection functions of the excitation controller are normal, and meanwhile, the fault signals reported by the exciter are verified to facilitate maintenance and protection under various working modes of a gas turbine generator.

2. The excitation controller testing system of the gas turbine generator set according to claim 1, wherein: the test system provides four power supply simulation generator excitation voltage outputs; firstly, a voltage-stabilizing direct-current power supply is adopted to replace a control system of a gas turbine generator set to provide a power supply and an instruction control power supply for an excitation controller; secondly, a No. 1 static variable frequency power supply is used as an excitation power supply, and a power supply signal provided by an auxiliary exciter for an excitation controller is simulated; thirdly, simulating three-phase alternating current output by the synchronous generator by using a No. 2 static variable frequency power supply; fourthly, the No. 3 static variable frequency power supply is adopted to simulate a main exciter to provide current feedback for the synchronous generator, so that the size of the exciting current of the generator is controlled, and the output voltage of the generator is controlled.

3. The excitation controller testing system of the gas turbine generator set according to claim 1, wherein: the relay I/O module is used for RS485 MODBUS RTU standard communication and has 10 paths of relay output and 12 paths of switching value state acquisition.

4. The excitation controller testing system of the gas turbine generator set according to claim 1, wherein: the test system adopts an analog quantity acquisition module for measuring and acquiring direct current voltage and current signals in real time, adopts linear optical coupler isolation to realize isolation between signals of each channel, and adopts a multipath 24-bit high-precision AD measurement chip for signal measurement.

5. The excitation controller testing system of the gas turbine generator set according to claim 1, wherein: the software design of the test system adopts a graphical software LabVIEW programming language as a development environment of the measurement and control system, and the main functions of the test system comprise data acquisition, real-time display, automatic storage, playback, analysis and automatic judgment, power supply voltage and frequency control, alarm and error display, and automatic control of the test process and steps.

6. The excitation controller testing system of the gas turbine generator set according to claim 2, wherein: the voltage-stabilizing direct-current power supply is 24V direct current; the No. 1 static variable frequency power supply is 27V and 800 Hz; the No. 2 static variable frequency power supply is 127V, 400 HZ; the No. 3 static variable frequency power supply is 9.5V and 400 HZ.

7. The excitation controller testing system of the gas turbine generator set according to claim 2, wherein: the four power supplies all adopt a program control mode, are completely monitored by an upper computer in a mode, use an RS232 serial port card and MODBUS RTU standard communication, adopt a USB-to-serial port module and directly communicate with a monitoring computer.

8. The excitation controller testing system of the gas turbine generator set according to any one of claims 1 to 7, characterized in that: the test system can synchronously execute a plurality of tasks, including a direct current power supply control program, a 400HZ variable frequency power supply control program, an 800HZ variable frequency power supply program, a data acquisition module program and a relay control module program, and the tasks are not interfered with each other.