Dynamic model test device and test method for static variable frequency starting system of gas turbine generator

Abstract

The invention discloses a dynamic model test device and a test method for a static variable frequency starting system of a gas turbine generator. The device comprises a synchronous motor-generator set, a static variable frequency starting system, a voltage source type frequency converter system, a synchronous generator excitation system, an automatic quasi-synchronous device and a load resistor box. The input end of the synchronous motor-generator set is connected to the output end of the voltage source type frequency converter system, the output ends of the synchronous motor-generator set, the static variable frequency starting system, the synchronous generator excitation system and the automatic quasi-synchronous device are all connected to the load resistor box, and the input ends of the static variable frequency starting system, the voltage source type frequency converter system, the synchronous generator excitation system and the automatic quasi-synchronous device are all connected to an AC power supply. The invention has the advantages of solving the problem that the prior art lacks a dynamic model test device and a method for a static variable frequency starting of a gas turbine generator, and using the dynamic model test device for testing and simulation.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbine generator set control, and more specifically to a dynamic model test device and a test method for a static variable frequency starting system of a gas turbine generator. Background Art

[0002] At present, the development and utilization of natural gas is the only way to move towards ecological civilization. Gas turbine power generation is an important part of clean energy power generation technology and is of great significance for actively promoting the national energy revolution.

[0003] However, there are many problems in the static variable frequency starting equipment of gas turbine generator sets. For example, most of the static variable frequency starting systems of gas turbine generators are imported equipment, and the operation and maintenance process is overly dependent on equipment manufacturers, resulting in high operation and maintenance costs. In addition, due to technical blockades, the replacement of spare parts for imported equipment is expensive and time-consuming, and the localization transformation is difficult. There is a lack of dynamic model test equipment to test the compatibility of imported equipment. In addition, there is a lack of dynamic model test equipment to test and simulate the abnormalities and failures that occur in the static variable frequency starting system of gas turbine generators during operation. At the same time, the operation and maintenance personnel of the static variable frequency starting equipment of gas turbine power plants lack dynamic model test equipment for technical training, and dare not operate them when encountering equipment problems.

[0004] Chinese patent publication number CN104091501A discloses an energy conversion dynamic model test bench based on a permanent magnet wind turbine generator. The test bench mainly includes a wind tower, a PC, a PLC control cabinet, a squirrel cage asynchronous motor, a permanent magnet synchronous generator, a grid-connected switch cabinet and a feeder cabinet; the squirrel cage asynchronous motor is connected to the permanent magnet synchronous generator, the squirrel cage asynchronous motor is connected to a grid-connected switch cabinet through a full-power converter, the permanent magnet synchronous generator is connected to another grid-connected switch cabinet through another full-power converter, the two grid-connected switch cabinets are connected to the feeder cabinet, and the feeder cabinet is connected to the power grid through a distribution transformer; the wind tower is connected to the PC, the PC is connected to the PLC control cabinet, and the PLC control cabinet is connected to two full-power converters. The invention allows experimenters to have a deeper understanding of the relevant principles and related control technologies of wind power generation in order to conduct further research. Although the invention belongs to a dynamic model test bench and test method, it cannot be applied to the static variable frequency starting dynamic model test of a gas turbine generator. In summary, the prior art lacks a dynamic model test device and method for static variable frequency starting of a gas turbine generator. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a dynamic model test device and a test method for a static variable frequency starting system of a gas turbine generator, and to use the dynamic model test device to perform a gas turbine generator starting test and simulation.

[0006] The present invention solves the above technical problems through the following technical means: a dynamic model test device for a gas turbine generator static variable frequency starting system, comprising a synchronous motor-generator set, a static variable frequency starting system, a voltage source type frequency converter system, a synchronous generator excitation system, an automatic quasi-synchronous device and a load resistor box, wherein the input end of the synchronous motor-generator set is connected to the output end of the voltage source type frequency converter system, the output ends of the synchronous motor-generator set, the static variable frequency starting system, the synchronous generator excitation system and the automatic quasi-synchronous device are all connected to the load resistor box, and the input ends of the static variable frequency starting system, the voltage source type frequency converter system, the synchronous generator excitation system and the automatic quasi-synchronous device are all connected to an AC power supply;

[0007] The synchronous motor-generator set is a synchronous motor and a synchronous generator installed coaxially. The synchronous motor simulates a gas turbine generator and drives the synchronous generator. The static variable frequency starting system is used to drag the synchronous motor-generator set from static to self-sustaining speed to achieve cranking, purging or cleaning. The voltage source inverter system is used to drive the synchronous motor and adjust the speed. The synchronous generator excitation system is used to provide excitation current during the starting process of the synchronous motor. The automatic quasi-synchronous device is used to detect whether the output voltage frequency, amplitude and phase of the power grid and gas turbine generator meet the conditions to achieve grid-connected control. The load resistance box is used to simulate the power grid load under actual working conditions.

[0008] The present invention provides a dynamic model test device and test method for a gas turbine generator static variable frequency starting system, which integrates a static variable frequency starting system, a synchronous generator excitation system, a generator-transformer group protection, and a frequency converter speed regulation function, and solves the problem that the prior art lacks a dynamic model test device and method for a gas turbine generator static variable frequency starting system. The dynamic model test device can be used to test and simulate abnormalities and faults that occur during the operation of the gas turbine generator static variable frequency starting system. At the same time, the operation and maintenance personnel of the static variable frequency starting equipment of the gas turbine power plant can also receive technical training through the dynamic model test device, and simulate operations through the dynamic model test device when encountering equipment problems, which is helpful for later hands-on practice.

[0009] Furthermore, the synchronous motor-generator set includes a coaxially connected synchronous motor, a synchronous generator and a flywheel, the input end of the synchronous motor is connected to the output end of the voltage source inverter system, and the output end of the synchronous generator is connected to the load resistor box.

[0010] Furthermore, the voltage source inverter system includes an input transformer, a converter, an input switch and an output switch, one end of the input switch is connected to an AC power supply, the other end of the input switch is connected to one end of the output switch through the input transformer and the converter, and the other end of the output switch is connected to the input end of the synchronous motor.

[0011] Furthermore, the synchronous generator excitation system includes an excitation regulator, a magnetizing circuit and a self-shunt excitation circuit, the magnetizing circuit includes a DC power supply and a resistor, the self-shunt excitation circuit includes an excitation transformer and an excitation rectifier module, the input end of the excitation transformer is connected to the AC power supply through switches S1 and S2 in sequence, the output end of the excitation transformer is connected to the neutral point of the excitation rectifier module, the input end of the excitation rectifier module is connected to the second terminal of the excitation regulator, the input end of the excitation transformer is connected to the output end of the synchronous generator through switch S3, the negative end of the DC power supply is connected to one end of the resistor through switch S4, the other end of the resistor is connected to the first terminal of the excitation regulator through switches S5 and S6 in sequence, the output end of the excitation rectifier module is connected to the connection line between switches S5 and S6, the positive end of the DC power supply is connected to the second terminal of the excitation regulator through switch S7, and the third terminal of the excitation regulator and the fourth terminal of the excitation regulator are respectively connected to the two ends of the rotor of the synchronous generator.

[0012] Furthermore, the DC power supply is a DC power supply with a voltage of 110V and a capacity of 1kVA.

[0013] Furthermore, the static frequency conversion starting system includes a switch S8, an input isolation transformer, a pulse rectifier inverter module and a switch S9, one end of the switch S8 is connected to the AC power supply, the other end of the switch S8 is connected to the input end of the input isolation transformer, the two output ends of the input isolation transformer are respectively connected to the two input ends of the pulse rectifier inverter module, the output end of the pulse rectifier inverter module is connected to one end of the switch S9, and the other end of the switch S9 is connected to the load resistance box.

[0014] Furthermore, the pulse rectifier inverter module is a 12-6 pulse rectifier inverter module, including a rectifier bridge Q1, a rectifier bridge Q2, an inverter bridge H2 and a smoothing inductor L1. The rectifier bridge Q1 is connected to the rectifier bridge Q2, the output end of the rectifier bridge Q2 is connected to one end of the smoothing inductor L1, the other end of the smoothing inductor L1 is connected to the input end of the inverter bridge H2, the output end of the inverter bridge H2 is connected to the input end of the rectifier bridge Q1, one output end of the input isolation transformer is connected to the neutral point of the rectifier bridge Q1, the other output end of the input isolation transformer is connected to the neutral point of the rectifier bridge Q2, and the neutral point of the inverter bridge H2 is connected to one end of the switch S9.

[0015] Furthermore, the automatic quasi-synchronous device includes an air switch, a first voltage transformer, a switch S10, a switch S11 and a second voltage transformer. One end of the air switch is connected to an AC power supply, and the other end of the air switch is connected to a load resistance box through switches S10 and S11 in sequence. The first voltage transformer is connected to a connecting line between the air switch and switch S10, and the second voltage transformer is connected to a connecting line between switch S10 and switch S11.

[0016] Furthermore, the AC power supply is a 380V three-phase AC power supply.

[0017] The present invention also provides a method for testing a gas turbine generator static variable frequency starting dynamic model, the method comprising:

[0018] Step 1: Self-check the synchronous generator excitation system and static variable frequency starting system before operation;

[0019] Step 2: gas turbine generator set starting mode selection, wherein, when the gas turbine generator set is started by a static variable frequency starting system, the corresponding voltage source inverter system works in mode 1, and when the gas turbine generator set is started by a synchronous motor, the voltage source inverter system works in mode 2; the gas turbine generator set is a synchronous generator;

[0020] Step 3: After selecting the static variable frequency starting system to start the gas turbine generator set, the synchronous generator excitation system and the static variable frequency starting system are ready;

[0021] Step 4: Static variable frequency starting system selects the starting mode, direct start, purge or water wash;

[0022] Step 5: After the static variable frequency starting system startup mode is selected, the static variable frequency starting system starts running;

[0023] Step 6: After the static variable frequency starting system is running, a signal is sent to the synchronous generator excitation system, and the synchronous generator excitation system is put into operation;

[0024] Step 7: The static variable frequency starting system drags the gas turbine generator set to the rated speed, or the voltage source inverter system drags the gas turbine generator set to the rated speed;

[0025] Step 8: The automatic quasi-synchronous device is put into operation to detect whether the output voltage frequency, amplitude and phase of the power grid and gas turbine generator set meet the conditions, and send out a grid connection control signal.

[0026] The advantages of the present invention are:

[0027] (1) The present invention provides a dynamic model test device and test method for a gas turbine generator static variable frequency starting system, which integrates a static variable frequency starting system, a synchronous generator excitation system, a generator-transformer group protection, and a frequency converter speed regulation function, thereby solving the problem that the prior art lacks a dynamic model test device and method for a gas turbine generator static variable frequency starting system. The dynamic model test device can be used to test and simulate abnormalities and faults that occur during the operation of the gas turbine generator static variable frequency starting system. At the same time, the operation and maintenance personnel of the static variable frequency starting equipment of the gas turbine power plant can also receive technical training through the dynamic model test device, and can perform simulated operations through the dynamic model test device when encountering equipment problems, which is helpful for later hands-on practice.

[0028] (2) The present invention provides a dynamic model test device for a gas turbine generator static variable frequency starting system, which can be used to perform grid access detection of a gas turbine static variable frequency starting system, a synchronous generator excitation system, and a voltage source type inverter system. It can also perform dynamic simulation of inverter high / low voltage crossing and inverter energy saving evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A primary system topology schematic diagram of a dynamic model test device for a gas turbine generator static variable frequency starting system provided by an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of a pulse rectifier inverter module in a dynamic model test device for a gas turbine generator static variable frequency starting system provided by an embodiment of the present invention;

[0031] Figure 3 A secondary system panel diagram of a dynamic model test device for a gas turbine generator static variable frequency starting system provided by an embodiment of the present invention;

[0032] Figure 4 A flow chart of a dynamic model test method for a gas turbine generator static variable frequency starting system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] like Figure 1 The figure shows the primary system topology principle diagram of the gas turbine generator static variable frequency starting dynamic model test device. Figure 3The present invention is a secondary system panel diagram of a gas turbine generator static variable frequency starting dynamic model test device. The gas turbine generator static variable frequency starting system dynamic model test device comprises a synchronous motor-generator set 1, a static variable frequency starting system 2, a voltage source type frequency converter system 3, a synchronous generator excitation system 4, an automatic quasi-synchronous device 5 and a load resistor box 6. The input end of the synchronous motor-generator set 1 is connected to the output end of the voltage source type frequency converter system 3, and the output ends of the synchronous motor-generator set 1, the static variable frequency starting system 2, the synchronous generator excitation system 4 and the automatic quasi-synchronous device 5 are all connected to the load resistor box 6 through a switch S12. The input ends of the static variable frequency starting system 2, the voltage source type frequency converter system 3, the synchronous generator excitation system 4 and the automatic quasi-synchronous device 5 are all connected to an alternating current power supply AC, and the alternating current power supply AC is a 380V three-phase alternating current power supply.

[0035] The synchronous motor-generator set 1 is a synchronous motor M and a synchronous generator G installed coaxially. The synchronous motor M simulates a gas turbine generator and drives the synchronous generator G. The static variable frequency starting system 2 is used to drag the synchronous motor-generator set 1 from static to a self-sustaining speed to achieve cranking, purging or cleaning. The voltage source inverter system 3 is used to drive the synchronous motor M and adjust the speed. The synchronous generator excitation system 4 is used to provide excitation current during the starting process of the synchronous motor M. The automatic quasi-synchronization device 5 is used to detect whether the output voltage frequency, amplitude and phase of the power grid and the gas turbine generator (i.e., the synchronous motor M) meet the conditions to achieve grid-connected control. The load resistor box 6 is used to simulate the power grid load under actual working conditions.

[0036] Continue reading Figure 1The synchronous motor-generator set 1 includes a coaxially connected synchronous motor M, a synchronous generator G and a flywheel 101. The input end of the synchronous motor M is connected to the output end of the voltage source inverter system 3, and the output end of the synchronous generator G is connected to the load resistor box 6. The synchronous motor M of the present invention adopts an AC 400V, 50Hz, 45kW permanent magnet synchronous motor with a rated speed of 1500rpm; the synchronous generator G adopts a 400V, 50Hz, 75kW electric excitation convex synchronous generator with a rated speed of 1500rpm, and is equipped with a generator outlet current transformer and a neutral point current transformer, a generator outlet voltage transformer, and a precise angular position sensor and a speed sensor. The 75kW generator itself has a small moment of inertia, and directly dragging it to increase speed quickly is not conducive to the study and research of the dynamic model test process. A static flywheel piece 101 is coaxially matched with the synchronous motor-generator set 1. The moment of inertia of the entire gas turbine generator set can be adjusted by adjusting the number of flywheel pieces 101 to test the acceleration dragging performance and the rationality of the control logic of the static variable frequency starting system. At the same time, the characteristics of the same static variable frequency starting system 2 when dragging gas turbine generator sets with different moments of inertia can also be studied, verifying the versatility of the static variable frequency starting system 2 to drag multiple gas turbine generator sets.

[0037] The static variable frequency starting system 2 includes a switch S8, an input isolation transformer T3, a pulse rectifier inverter module and a switch S9. One end of the switch S8 is connected to an AC power source AC, and the other end of the switch S8 is connected to the input end of the input isolation transformer T3. The pulse rectifier inverter module is a 12-6 pulse rectifier inverter module, including a rectifier bridge Q1, a rectifier bridge Q2, an inverter bridge H2 and a smoothing reactor L1. The rectifier bridge Q1 is connected to the rectifier bridge Q2, the output end of the rectifier bridge Q2 is connected to one end of the smoothing reactor L1, the other end of the smoothing reactor L1 is connected to the input end of the inverter bridge H2, the output end of the inverter bridge H2 is connected to the input end of the rectifier bridge Q1, one output end of the input isolation transformer is connected to the neutral point of the rectifier bridge Q1, the other output end of the input isolation transformer is connected to the neutral point of the rectifier bridge Q2, the neutral point of the inverter bridge H2 is connected to one end of the switch S9, and the other end of the switch S9 is connected to the load resistor box 6. The present invention Figure 1 Only a brief connection diagram of the rectifier bridge Q1, rectifier bridge Q2, inverter bridge H2 and smoothing reactor L1 is given. The rectifier bridge Q1 and rectifier bridge Q2 are both three-phase rectifier bridges, and the inverter bridge H2 is a three-phase inverter bridge. The detailed schematic diagram is as follows Figure 2 As shown, the rectifier bridge and inverter bridge belong to the existing conventional technology. For detailed connection relationship, please refer to Figure 2 The connection relationship is not described here. The input end refers to the current entrance direction of the rectifier bridge, the output end refers to the current exit direction of the rectifier bridge, and the neutral point refers to the connection point of the upper and lower bridge arms of the rectifier bridge or inverter bridge. Figure 1The input end of the middle rectifier bridge Q2 is the end connected to the inductor L1, and the input end is the end connected to the inverter bridge H2. The input, output and neutral point definitions of the rectifier bridge Q1, rectifier bridge H4 and inverter bridge H2 are the same as those of the rectifier bridge Q2. The static variable frequency starting system 2 of the embodiment of the present invention adopts a main circuit 12-6 pulse rectifier inverter module, a capacity of 5kVA, a rated voltage of 400V, and a rated current of DC20A. The smoothing reactor L1 adopts an adjustable reactor, which is continuously adjustable within the range of 1 to 65mH. The power supply of the static variable frequency starting system 2 is a three-phase AC power supply with a voltage of 380V and a capacity of 3kVA.

[0038] The voltage source inverter system 3 includes an input transformer T1, a converter U1, an input switch K1 and an output switch K2, one end of the input switch K1 is connected to an AC power source AC, the other end of the input switch K1 is connected to one end of the output switch K2 through the input transformer T1 and the converter U1, and the other end of the output switch K2 is connected to the input end of the synchronous motor M. The converter U1 is composed of an AC / DC rectifier unit, a DC / AC inverter unit and a filter capacitor. The converter belongs to the existing conventional technology, and its connection relationship is not described in detail. The voltage source inverter system 3 of the embodiment of the present invention has a rated power of 45kW, a rated input voltage of 400V, a rated input frequency of 50Hz, a rated output voltage of 0-400V, and a rated output frequency of 0-52.5Hz. The voltage source inverter system 3 has two working modes: one is the gas turbine start-up mode, in which the torque is output according to the speed-torque curve preset inside the inverter; the other is the motor start-up mode, in which the inverter drags the gas turbine generator set to the rated speed and adjusts the speed online according to the increase and decrease instructions of the synchronous device. The power supply of the voltage source inverter system 3 is a three-phase AC power supply with a voltage of 380V and a capacity of 50kVA.

[0039] The synchronous generator excitation system 4 includes an excitation regulator AVR, a magnetizing circuit and a self-shunt excitation circuit. The magnetizing circuit includes a DC power supply DC and a resistor R. The DC power supply DC is a DC power supply with a voltage of 110V and a capacity of 1kVA. The self-parallel excitation circuit includes an excitation transformer T2 and an excitation rectifier module H4. The excitation rectifier module H4 is essentially a three-phase rectifier bridge. The input end of the excitation transformer T2 is connected to the AC power supply AC through switches S1 and S2 in sequence, the output end of the excitation transformer T2 is connected to the neutral point of the excitation rectifier module H4, the input end of the excitation rectifier module H4 is connected to the second terminal of the excitation regulator AVR, the input end of the excitation transformer T2 is connected to the output end of the synchronous generator G through switch S3, the negative end of the DC power supply DC is connected to one end of the resistor R through switch S4, the other end of the resistor R is connected to the first terminal of the excitation regulator AVR through switches S5 and S6 in sequence, the output end of the excitation rectifier module H4 is connected to the connection line between switches S5 and S6, the positive end of the DC power supply DC is connected to the second terminal of the excitation regulator AVR through switch S7, the third terminal of the excitation regulator AVR and the fourth terminal of the excitation regulator AVR are respectively connected to the two ends of the rotor of the synchronous generator G, and the rotor of the synchronous generator G, i.e. Figure 1 The inductance mark is shown directly below the synchronous generator G. In the embodiment of the present invention, the main circuit of the synchronous generator excitation system 4 is a self-parallel excitation mode, with a rated load excitation voltage of 83V, a rated load excitation current of 1.8A, a rated no-load excitation voltage of 66.4V, and a rated no-load excitation current of 1.45A. The AC excitation power supply is a three-phase AC power supply with a voltage of 380V and a capacity of 5kVA, and the DC excitation power supply is a DC power supply with a voltage of 110V and a capacity of 1kVA.

[0040] The automatic quasi-synchronous device 5 includes an air switch K3, a first voltage transformer PT1, a switch S10, a switch S11 and a second voltage transformer PT2, one end of the air switch K3 is connected to an AC power source AC, the other end of the air switch K3 is connected to a load resistor box 6 through switches S10 and S11 in sequence, the first voltage transformer PT1 is connected to a connection line between the air switch K3 and the switch S10, and the second voltage transformer PT2 is connected to a connection line between the switch S10 and the switch S11. The power source connected to the automatic quasi-synchronous device 5 is a three-phase AC power source with a voltage of 380V and a capacity of 50kVA.

[0041] like Figure 4 As shown, the present invention also provides a gas turbine generator static variable frequency starting dynamic model test method, the method comprising:

[0042] Step S1: Synchronous generator excitation system 4 ( Figure 4 excitation) and static variable frequency starting system 2 ( Figure 3SFC for short) self-check before operation;

[0043] Step S2: Gas turbine generator set ( Figure 4 The starting mode of the gas turbine generator set is selected, wherein the static variable frequency starting system 2 is used to start the gas turbine generator set, and the corresponding voltage source inverter system 3 works in mode 1, and the voltage source inverter system 3 outputs torque according to the internal preset speed-torque curve, simulates the torque output of the gas turbine, and drags the gas turbine generator set together with the static variable frequency starting system 2; the gas turbine generator set is started by the synchronous motor M, and the voltage source inverter system 3 works in mode 2, and the voltage source inverter system 3 drags the gas turbine generator set to the rated speed, and adjusts the speed online according to the increase and decrease instructions of the automatic quasi-synchronous device 5; the gas turbine generator set is the synchronous generator G;

[0044] Step S3: After the static variable frequency starting system 2 is selected to start the gas turbine generator set, the synchronous generator excitation system 4 and the static variable frequency starting system 2 are ready;

[0045] Step S4: The static variable frequency starting system 2 selects a starting mode, direct start, purge or water wash;

[0046] Step S5: After the static variable frequency starting system 2 starts in a starting mode, the static variable frequency starting system 2 starts to run;

[0047] Step S6: After the static variable frequency starting system 2 is running, a signal is sent to the synchronous generator excitation system 4, and the synchronous generator excitation system 4 is put into operation;

[0048] Step S7: the static variable frequency starting system 2 drives the gas turbine generator set to the rated speed, or the voltage source inverter system 3 drives the gas turbine generator set to the rated speed;

[0049] Step S8: The automatic quasi-synchronization device 5 is put into operation to detect whether the frequency, amplitude and phase of the output voltage of the power grid and the gas turbine generator set meet the conditions, and send out a grid connection control signal.

[0050] The present invention provides a dynamic model test device and test method for a gas turbine generator static variable frequency starting system, which integrates a static variable frequency starting system, a synchronous generator excitation system, a generator-transformer group protection, and a frequency converter speed regulation function, and solves the problem that the prior art lacks a dynamic model test device and method for a gas turbine generator static variable frequency starting. The dynamic model test device can be used to test and simulate abnormalities and faults that occur during the operation of the gas turbine generator static variable frequency starting system. At the same time, the operation and maintenance personnel of the static variable frequency starting equipment of the gas turbine power plant can also receive technical training through the dynamic model test device, and simulate operations through the dynamic model test device when encountering equipment problems, which is helpful for later hands-on operation.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Dynamic model test device for gas turbine generator static variable frequency starting system, characterized in that: It includes a synchronous motor-generator set, a static variable frequency starting system, a voltage source type frequency converter system, a synchronous generator excitation system, an automatic quasi-synchronous device and a load resistor box, wherein the input end of the synchronous motor-generator set is connected to the output end of the voltage source type frequency converter system, the output ends of the synchronous motor-generator set, the static variable frequency starting system, the synchronous generator excitation system and the automatic quasi-synchronous device are all connected to the load resistor box, and the input ends of the static variable frequency starting system, the voltage source type frequency converter system, the synchronous generator excitation system and the automatic quasi-synchronous device are all connected to an AC power supply; The synchronous motor-generator set is a synchronous motor and a synchronous generator installed coaxially. The synchronous motor simulates a gas turbine and drives the synchronous generator. The static variable frequency starting system is used to drag the synchronous motor-generator set from static to self-sustaining speed, and realize cranking, purging or water washing. The voltage source inverter system is used to drive the synchronous motor and adjust the speed. The synchronous generator excitation system is used to provide excitation current during the starting process of the synchronous motor. The automatic quasi-synchronous device is used to detect whether the output voltage frequency, amplitude and phase of the power grid and gas turbine generator meet the conditions to realize grid-connected control. The load resistance box is used to simulate the power grid load under actual working conditions.

2. The dynamic model test device for the static variable frequency starting system of a gas turbine generator according to claim 1 is characterized in that: The synchronous motor-generator set comprises a coaxially connected synchronous motor, a synchronous generator and a flywheel. The input end of the synchronous motor is connected to the output end of the voltage source inverter system, and the output end of the synchronous generator is connected to the load resistance box.

3. The dynamic model test device for the static variable frequency starting system of a gas turbine generator according to claim 2 is characterized in that: The voltage source inverter system includes an input transformer, a converter, an input switch and an output switch, one end of the input switch is connected to an AC power supply, the other end of the input switch is connected to one end of the output switch through the input transformer and the converter, and the other end of the output switch is connected to the input end of the synchronous motor.

4. The dynamic model test device for the static variable frequency starting system of a gas turbine generator according to claim 2 is characterized in that: The excitation system of the synchronous generator includes an excitation regulator, a magnetizing circuit and a self-shunt excitation circuit. The magnetizing circuit includes a DC power supply and a resistor. The self-shunt excitation circuit includes an excitation transformer and an excitation rectifier module. The input end of the excitation transformer is connected to the AC power supply through switches S1 and S2 in sequence, the output end of the excitation transformer is connected to the neutral point of the excitation rectifier module, the input end of the excitation rectifier module is connected to the second terminal of the excitation regulator, the input end of the excitation transformer is connected to the output end of the synchronous generator through switch S3, the negative end of the DC power supply is connected to one end of the resistor through switch S4, the other end of the resistor is connected to the first terminal of the excitation regulator through switches S5 and S6 in sequence, the output end of the excitation rectifier module is connected to the connection line between switches S5 and S6, the positive end of the DC power supply is connected to the second terminal of the excitation regulator through switch S7, and the third terminal of the excitation regulator and the fourth terminal of the excitation regulator are respectively connected to the two ends of the rotor of the synchronous generator.

5. The dynamic model test device for the static variable frequency starting system of a gas turbine generator according to claim 4 is characterized in that: The DC power supply is a DC power supply with a voltage of 110V and a capacity of 1kVA.

6. The dynamic model test device for the static variable frequency starting system of a gas turbine generator according to claim 1 is characterized in that: The static variable frequency starting system includes a switch S8, an input isolation transformer, a pulse rectifier inverter module and a switch S9, one end of the switch S8 is connected to an AC power supply, the other end of the switch S8 is connected to an input end of the input isolation transformer, two output ends of the input isolation transformer are respectively connected to two input ends of the pulse rectifier inverter module, the output end of the pulse rectifier inverter module is connected to one end of the switch S9, and the other end of the switch S9 is connected to a load resistor box.

7. The dynamic model test device for the static variable frequency starting system of a gas turbine generator according to claim 6 is characterized in that: The pulse rectifier inverter module is a 12-6 pulse rectifier inverter module, including a rectifier bridge Q1, a rectifier bridge Q2, an inverter bridge H2 and a smoothing inductor L1. The rectifier bridge Q1 is connected to the rectifier bridge Q2, the output end of the rectifier bridge Q2 is connected to one end of the smoothing inductor L1, the other end of the smoothing inductor L1 is connected to the input end of the inverter bridge H2, the output end of the inverter bridge H2 is connected to the input end of the rectifier bridge Q1, one output end of the input isolation transformer is connected to the neutral point of the rectifier bridge Q1, the other output end of the input isolation transformer is connected to the neutral point of the rectifier bridge Q2, and the neutral point of the inverter bridge H2 is connected to one end of the switch S9.

8. The dynamic model test device for the static variable frequency starting system of a gas turbine generator according to claim 1 is characterized in that: The automatic quasi-synchronous device includes an air switch, a first voltage transformer, a switch S10, a switch S11 and a second voltage transformer. One end of the air switch is connected to an AC power supply, and the other end of the air switch is connected to a load resistance box through switches S10 and S11 in sequence. The first voltage transformer is connected to a connecting line between the air switch and switch S10, and the second voltage transformer is connected to a connecting line between switch S10 and switch S11.

9. The dynamic model test device for the static variable frequency starting system of a gas turbine generator according to claim 1, characterized in that: The AC power supply is a 380V three-phase AC power supply.

10. The test method of the dynamic model test device of the gas turbine generator static variable frequency starting system according to any one of claims 1 to 9, characterized in that: The method comprises: Step 1: Self-check the synchronous generator excitation system and static variable frequency starting system before operation; Step 2: gas turbine generator set starting mode selection, wherein, when the gas turbine generator set is started by a static variable frequency starting system, the corresponding voltage source inverter system works in mode 1, and when the gas turbine generator set is started by a synchronous motor, the voltage source inverter system works in mode 2; the gas turbine generator set is a synchronous generator; Step 3: After selecting the static variable frequency starting system to start the gas turbine generator set, the synchronous generator excitation system and the static variable frequency starting system are ready; Step 4: Static variable frequency starting system selects the starting mode, direct start, purge or water wash; Step 5: After the static variable frequency starting system startup mode is selected, the static variable frequency starting system starts running; Step 6: After the static variable frequency starting system is running, a signal is sent to the synchronous generator excitation system, and the synchronous generator excitation system is put into operation; Step 7: The static variable frequency starting system drags the gas turbine generator set to the rated speed, or the voltage source inverter system drags the gas turbine generator set to the rated speed; Step 8: The automatic quasi-synchronous device is put into operation to detect whether the output voltage frequency, amplitude and phase of the power grid and gas turbine generator set meet the conditions, and send out a grid connection control signal.

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