A converter control method based on a small generator with a BEST small steam turbine

Abstract

The application discloses a converter control method based on a BEST small steam turbine with a small generator, which comprises BEST converter starting control and BEST converter stopping control, and can avoid converter system failure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of thermal control of BEST small steam turbine with small generator in ultra-supercritical double-reheat coal-fired unit, and relates to a converter control method based on BEST small steam turbine with small generator. BACKGROUND

[0002] With the development of the application of the converter in the power industry, the converter has become a very important device in wind power and is applied in the field of new energy such as wind power. The application research of the converter in traditional thermal power generation is relatively less, and the application of the converter in the thermal control field of the thermal power plant is still in the initial development stage.

[0003] When the control mode of the BEST small steam turbine using the small machine control valve starts to start, the opening of the BEST small steam turbine valve slowly increases to 1000r / min of the warm-up speed. At this time, the small machine feed water pump is in the mode of "converter main control", and the converter is used to control the speed of the BEST small steam turbine, the converter drives the feed water pump to run and converts the excess power into electrical energy through the small generator to provide power to the auxiliary power. In the above starting process of the BEST small steam turbine, there is no standard and safe converter control system method, and the operator avoids various converter system failures and other problems when operating the converter. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a converter control method based on BEST small steam turbine with small generator, which can avoid converter system failure.

[0005] To achieve the above purpose, the converter control method based on BEST small steam turbine with small generator according to the present application comprises BEST converter start control and BEST converter stop control.

[0006] The specific process of the BEST converter start control is as follows:

[0007] 101) Check the state of the BEST small steam turbine, confirm whether the start requirements of the converter start control system are met, and after the MEH with the motor is running, go to step 102);

[0008] 102) After the speed of the BEST small steam turbine meets the preset speed target value, and the feedback signal of the BEST converter is ready, go to step 103);

[0009] 103) Check whether the BEST converter has a closing condition, and prepare to close the high-voltage side of the BEST converter in sequence, and when the BEST converter has a closing condition, issue a BEST converter unlocking instruction and a BEST converter closing instruction;

[0010] 104) After the BEST converter is in the closing state, the water cooling system is started to operate;

[0011] 105) Check whether the starting water cooling system is started normally and operates stably, and after the starting water cooling system is started normally and operates stably, go to step 106);

[0012] 106) Close the high open cabinet circuit breaker;

[0013] 107) Close the damping cabinet;

[0014] 108) Close the machine side high open cabinet circuit breaker;

[0015] 109) After the BEST converter has the starting condition, the BEST converter is ready and the feedback signal of the high voltage closing of the BEST converter has met the condition, it indicates that the high open cabinet circuit breaker, the damping cabinet and the machine side high open cabinet circuit breaker have been closed completely;

[0016] 1010) Send the BEST converter starting command speed given instruction, after the BEST converter receives the BEST converter starting command speed given instruction, start the BEST converter;

[0017] 1011) Close the excitation circuit breaker, after the excitation circuit breaker is normally closed, the excitation circuit breaker is excited to operate, after the excitation circuit breaker is normally operated, the excitation circuit breaker is excited to be ready, after the excitation circuit breaker is excited to be ready and the feedback signal of the BEST converter request master control has met the condition, go to step 1012);

[0018] 1012) Send the BEST converter master control instruction, and perform the BEST converter master control operation, when the BEST converter operates and the feedback signal of the BEST converter master control feedback has met the condition, it indicates that the BEST converter has been in the operating state and the small machine feed water pump is in the mode of converter master control, the speed of the BEST small steam turbine is controlled by the BEST converter.

[0019] The specific process of the BEST converter stop control is:

[0020] 201) Check the state of the BEST small steam turbine to confirm whether the stop requirement of the converter stop control system is met, after the MEH is operated with the machine, go to step 202);

[0021] 202) check whether it is in the MEH master state, after being in the MEH master state, judge whether the BEST converter has the breaking condition, after the BEST converter has the breaking condition, break the excitation circuit breaker of the BEST converter;

[0022] 203) send the BEST converter stop instruction, after the BEST converter receives the BEST converter stop instruction, and the excitation circuit breaker has been broken, then go to step 204);

[0023] 204) after waiting for the feedback signal of the BEST converter stop and excitation breaking to meet the condition, go to step 205);

[0024] 205) send the BEST converter high-voltage breaking instruction and perform the BEST converter high-voltage breaking;

[0025] 206) simultaneously close the high-opening cabinet circuit breaker, the damping cabinet and the machine side high-opening cabinet circuit breaker;

[0026] 207) check whether the BEST converter meets the preset high-opening state, and whether the feedback signals of the high-opening cabinet circuit breaker, the damping cabinet and the machine side high-opening cabinet circuit breaker meet the condition, when the BEST converter meets the preset high-opening state, and the feedback signals of the high-opening cabinet circuit breaker, the damping cabinet and the machine side high-opening cabinet circuit breaker meet the condition, the BEST converter has been successfully stopped.

[0027] The present application has the following beneficial effects:

[0028] The BEST small steam turbine with a small generator based converter control method has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the BEST converter;

[0030] Figure 2 It is a BEST converter start control flow chart;

[0031] Figure 3 It is a BEST converter stop control flow chart.

[0032] Wherein, S001 is 10KV busbar, S002 is high open cabinet circuit breaker, S003 is damping cabinet, S004 is damping cabinet bypass circuit breaker, S005 is #1 power cabinet, S006 is #2 power cabinet, S007 is #3 power cabinet, S008 is #4 power cabinet, S009 is machine side high open cabinet circuit breaker, S010 is synchronous motor, S011 is excitation circuit breaker, and S012 is 380V excitation main power supply. DETAILED DESCRIPTION

[0033] In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments, and are not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts should belong to the scope of protection of the present application.

[0034] The structural schematic diagram according to the disclosed embodiments of the present application is shown in the drawings. These drawings are not drawn to scale, in which some details are enlarged for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and their relative size and positional relationship shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and the regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0035] Figure 1 The structural schematic diagram of the BEST converter described in the present application is shown in the drawings;

[0036] The BEST converter includes 10KV busbar S001, high open cabinet circuit breaker S002, damping cabinet S003, damping cabinet bypass circuit breaker S004, #1 power cabinet S005, #2 power cabinet S006, #3 power cabinet S007, #4 power cabinet S008, machine side high open cabinet circuit breaker S009, synchronous motor S010, excitation circuit breaker S011 and 380V excitation main power supply S012;

[0037] Wherein, the closing sequence of the BEST converter is to sequentially close the high open cabinet circuit breaker S002, the damping cabinet bypass circuit breaker S004, the machine side high open cabinet circuit breaker S009 and the excitation circuit breaker S011.

[0038] The breaking sequence of the BEST converter is: first breaking the excitation circuit breaker S011, and then breaking the high open cabinet circuit breaker S002, the damping cabinet bypass circuit breaker S004 and the machine side high open cabinet circuit breaker S009 at the same time.

[0039] Referring to Figure 2 The flow chart of the BEST converter start-up control system specifically includes the following steps.

[0040] 101) checking the state of the BEST small steam turbine to confirm whether the start-up requirements of the converter start-up control system are met, and when the MEH is running with the machine being electrified, going to step 102);

[0041] 102) when the rotating speed of the BEST small steam turbine meets the preset rotating speed target value and the feedback signal of the BEST converter preparation has met the condition, going to step 103);

[0042] 103) checking whether the BEST converter has the closing condition, and preparing to close the high voltage side of the BEST converter in sequence, and when the BEST converter has the closing condition, issuing the BEST converter unlocking instruction and the BEST converter closing instruction;

[0043] 104) after the BEST converter is in the closing state, starting the running water cooling system, which can continuously cool the BEST converter to avoid the BEST converter from malfunctioning due to the excessively high temperature;

[0044] 105) checking whether the starting running water cooling system is started normally and runs stably, and after the starting running water cooling system is started normally and runs stably, going to step 106);

[0045] 106) closing the high open cabinet circuit breaker S002;

[0046] 107) closing the damping cabinet S003;

[0047] 108) closing the machine side high open cabinet circuit breaker S009;

[0048] 109) at this time, the BEST converter has the start-up condition, the BEST converter is ready and the feedback signal of the BEST converter high voltage closing has met the condition, which indicates that the high open cabinet circuit breaker S002, the damping cabinet S003 and the machine side high open cabinet circuit breaker S009 have all been closed;

[0049] 1010) issuing the BEST converter start-up command rotating speed given instruction, and after the BEST converter receives the BEST converter start-up command rotating speed given instruction, starting the BEST converter;

[0050] 1011) Close the excitation circuit breaker S011, after the excitation circuit breaker S011 is normally closed, the excitation circuit breaker S011 is in excitation operation, after the excitation circuit breaker S011 is in normal excitation operation, the excitation circuit breaker S011 is in excitation readiness, after the excitation circuit breaker S011 is in excitation readiness and the feedback signal requested by the BEST converter master control has met the conditions, go to step 1012);

[0051] 1012) Send the BEST converter master control instruction, and perform the BEST converter master control operation, when the BEST converter is in operation and the feedback signal of the BEST converter master control feedback has met the conditions, it means that the BEST converter is in operation and the small machine feed water pump is in the converter master control mode, and the speed of the BEST small steam turbine is controlled by the BEST converter.

[0052] Referring to Figure 3 The flow chart is for the BEST converter stop control system, and the specific process is as follows:

[0053] 201) Check the state of the BEST small steam turbine to confirm whether the stop requirements of the converter stop control system are met, after the MEH motor is in operation, go to step 202);

[0054] 202) Check whether it is in the MEH master control state, when it is in the MEH master control state, judge whether the BEST converter has the tripping condition, after the BEST converter has the tripping condition, the excitation circuit breaker S011 of the BEST converter is tripped;

[0055] 203) Send the BEST converter stop instruction, after the BEST converter receives the BEST converter stop instruction and the excitation circuit breaker S011 has been tripped, go to step 204);

[0056] 204) Wait for the feedback signal of the BEST converter stop and excitation tripping to meet the conditions, then go to step 205);

[0057] 205) Send the BEST converter high voltage tripping instruction, and perform the BEST converter high voltage tripping;

[0058] 206) Close the high cabinet circuit breaker S002, the damping cabinet S003 and the machine side high cabinet circuit breaker S009 at the same time to protect the converter from being damaged;

[0059] 207) Check whether the BEST converter meets the preset high-opening state, and whether the feedback signals of the high-opening cabinet breaker S002, the damping cabinet S003 and the machine-side high-opening cabinet breaker S009 meet the conditions. When the BEST converter meets the preset high-opening state, and the feedback signals of the high-opening cabinet breaker S002, the damping cabinet S003 and the machine-side high-opening cabinet breaker S009 meet the conditions, the BEST converter has been successfully stopped.

Claims

1. A converter control method based on a BEST small steam turbine with a small generator, characterized in that: Including BEST converter start control and BEST converter stop control; The specific process of BEST converter startup control is as follows: 101) Check the status of the BEST small steam turbine to confirm whether it meets the startup requirements of the converter startup control system. After the MEH is running with the motor, go to step 102); 102) After the speed of the BEST small steam turbine meets the preset speed target value and the feedback signal prepared by the BEST converter has met the conditions, go to step 103); 103) Check whether the BEST converter meets the closing conditions, prepare to close the high-voltage side of the BEST converter in sequence, and when the BEST converter meets the closing conditions, issue the BEST converter unlocking command and the BEST converter closing command; 104) After the BEST converter is in the closed state, the water cooling system is started; 105) Check whether the water cooling system starts normally and operates stably. If the water cooling system starts normally and operates stably, go to step 106); 106) Close the high-opening cabinet circuit breaker (S002); 107) Close the damping cabinet (S003); 108) Close the high-opening cabinet circuit breaker (S009) on the machine side; 109) When the BEST converter has met the starting conditions, the BEST converter is ready and the feedback signal of the BEST converter high-voltage closing has met the conditions, it means that the high-opening cabinet circuit breaker (S002), the damping cabinet (S003) and the generator side high-opening cabinet circuit breaker (S009) have all been closed; 1010) issuing a BEST converter start command speed setting instruction, and starting the BEST converter after the BEST converter receives the BEST converter start command speed setting instruction; 1011) close the excitation circuit breaker (S011), after the excitation circuit breaker (S011) is closed normally, the excitation circuit breaker (S011) performs excitation operation, after the excitation of the excitation circuit breaker (S011) is normally operated, the excitation circuit breaker (S011) is ready for excitation, after the excitation circuit breaker (S011) is ready for excitation and the feedback signal of the BEST converter requesting the master control has met the conditions, go to step 1012); 1012) Sending a command to allow the BEST converter master control and performing BEST converter master control operation. When the BEST converter is in operation and the feedback signal of the BEST converter master control meets the conditions, it indicates that the BEST converter is in operation and the small machine feed water pump is in converter master control mode. The BEST converter is used to control the speed of the BEST small steam turbine. The specific process of the BEST converter stop control is as follows: 201) Check the status of the BEST small steam turbine to confirm whether it meets the stop requirements of the converter stop control system. After the MEH is running with the motor, go to step 202); 202) Check whether it is in the MEH master control state. If it is in the MEH master control state, determine whether the BEST converter has the tripping condition. After the BEST converter has the tripping condition, open the excitation circuit breaker (S011) of the BEST converter. 203) Sending a BEST converter stop command, after the BEST converter receives the BEST converter stop command and the excitation circuit breaker (S011) has been opened, go to step 204); 204) Wait until the BEST converter stops and the feedback signal of the excitation tripping has met the conditions, then go to step 205); 205) Sending a BEST converter high voltage tripping instruction and performing BEST converter high voltage tripping; 206) Close the high-opening cabinet circuit breaker (S002), the damping cabinet (S003) and the high-opening cabinet circuit breaker (S009) on the generator side simultaneously; 207) Check whether the BEST converter meets the preset high-open state, and whether the feedback signals of the high-open cabinet circuit breaker (S002), the damping cabinet (S003) and the machine-side high-open cabinet circuit breaker (S009) meet the conditions. When the BEST converter meets the preset high-open state, and the feedback signals of the high-open cabinet circuit breaker (S002), the damping cabinet (S003) and the machine-side high-open cabinet circuit breaker (S009) meet the conditions, the BEST converter has stopped successfully.

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