Fault detection and processing method for marine annular DC busbar power supply device

Abstract

The invention discloses a fault detection and processing method for a marine annular DC busbar power supply device, and the method constructs a marine annular busbar power supply device composed of five segments of DC busbars, carries out the detection of each segment, and carries out the closing of a circuit breaker through different methods according to the fault conditions. And the non-fault part of the fault section can be reserved, and the fault part is disconnected. When a fault occurs, the working state of the whole busbar is not influenced, and a non-fault part of a fault section can still work continuously. A generator-busbar-load segmented detection mode from top to bottom is adopted, the specific fault position can be rapidly detected, the detection efficiency is high, and the influence caused by the fault can be reduced to the maximum extent. According to different working modes, corresponding fault processing methods are provided, so that the whole system can be automatically adjusted to the greatest extent, and manual processing is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ship electric propulsion systems, and in particular to a method for detecting and processing faults of a ship-used annular DC busbar power supply device. Background Art

[0002] The advantage of the ring DC busbar is that fewer generator sets can be used, making the ship's operation less fuel-intensive, more economical, and more environmentally friendly. The failure of the circuit components of various parts of the ship's propulsion system is unstable and frequent, and it is difficult to determine the failure. Once a line or equipment failure occurs, the consequences are extremely serious. Not only will it affect the power, but if the fault point cannot be found and dealt with in time, it is very likely to cause secondary disasters, resulting in serious property losses and casualties.

[0003] Chinese patent application number "201920009578.1" discloses "a DC ring network electric propulsion system" including several DC busbar modules, several bus tie breakers, several power supply branches, and several power consumption branches; the power supply branches correspond to the DC busbar modules one by one; the DC busbar modules are connected end to end in a ring network; the DC busbar module includes a DC busbar and a bus tie breaker connected in series, and the bus tie breaker is connected in series between every two adjacent DC busbars. However, when a certain component such as a diesel engine, a conversion module, etc. fails, this patent completely cuts off this section. Although it does not affect the operation of other sections, not all components in the faulty section fail, such as: if the diesel engine unit or the conversion module in the upper part of this section fails, the components in the lower part that have not failed can continue to be used. Summary of the invention

[0004] In view of the above problems, the present invention proposes a method for fault detection, positioning and processing of a marine ring-shaped DC busbar power supply device. The method detects the "generator busbar load" from top to bottom and processes the fault in sections according to the fault situation. The method has high efficiency and low missed detection rate, ensuring that the working state of the entire busbar is not affected when a fault occurs.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a fault detection and processing method for a marine annular DC busbar power supply device, wherein the marine annular DC busbar power supply device includes a power generation unit, an annular DC busbar, and a load unit. The power generation unit provides electric energy to the load unit through the annular DC busbar; the power generation unit includes four groups of power generation modules 1, 2, 3 and 4 with the same structure, each power generation module includes a diesel generator and an AC / DC conversion module connected in sequence, and torque sensors K are provided at the four diesel generators. A1 , K A2 , K A3 , K A4; Circuit breakers S are set between the four diesel generators and the corresponding AC / DC conversion modules C1 , S C2 , S C3 , S C4 ;

[0006] The annular DC busbar is provided with five sections of DC busbar main lines and three sections of DC busbar branches, and the five sections of DC busbar main lines are connected end to end in sequence; the output ends of the four AC / DC conversion modules are connected to the first section of the busbar main line to the fourth section of the busbar main line in sequence,

[0007] One end of the three-section busbar branch line is respectively set at the node between the first section busbar main line and the second section busbar main line, the second section busbar main line and the third section busbar main line, and the third section busbar main line and the fourth section busbar main line, and the other end of the three-section busbar branch line is connected to the fifth section busbar main line; the three sections busbar branch lines are respectively provided with circuit breakers S B1 , S B2 , S B3 ;

[0008] A circuit breaker S is arranged on the left and right sides of each AC / DC conversion module and the corresponding DC busbar main line connection point. A1 , S A2 …S A8 ; Current sensors J are respectively provided on the first busbar main line to the fourth busbar main line B1 , J B2 , J B3 , J B4 ; Current sensors J are set at the output ends of the four AC / DC conversion modules A1 , J A2 , J A3 , J A4 ; Speed ​​sensors M are installed at all four diesel generators A1 , M A2 , M A3 , M A4 ;

[0009] The load unit comprises four load modules, each of which comprises a DC / AC conversion module, a motor and a propeller connected in sequence, and a circuit breaker S is installed between the four DC / AC conversion modules and the four motors. D1 , S D2 , S D3 S D4 ; All four propellers are equipped with speed sensors M B1 , M B2 , M B3 , M B4 ; Current sensors J are provided at all four DC / AC conversion modules C1 , JC2 , J C3 , J C4 ;

[0010] The speeds of the four diesel generators are denoted as N A1 , N A2 , N A3 , N A4 When working normally, its operating speed range is recorded as N Amin1 ~N Amax1 , N 4min2 ~N Amax2 , N Amin3 ~N Amax3 , N Amin4 ~N Amax4 , the current sensor of the AC / DC module collects the current and records it as I A1 , I A2 , I A3 , I A4 The normal operating current range of the first busbar main line to the fourth busbar main line is recorded as I min1 ~I max1 , I min2 ~I max2 , ..., I min n ~I max n , current I min1 , I min2 ,…,I min n If the negative current is detected, it is considered as reverse power. If it exceeds the corresponding I max1 , I max2 ,…,I max n It is judged as overload; the current collected by the current sensor of the first to fourth busbar main lines is recorded as I B1 , I B2 , I B3 , I B4 , the current collected by the four DC / AC module current sensors is recorded as I C1 , I C2 , I C3 , I C4 , the speed of the four propellers is recorded as N B1 , N B2 , N B3 , N B4 , the normal operating range of the four thrusters is recorded as N B min1 ~N B max1 , N B min2 ~N B max2 , ..., K B min n ~N B max n ; If a unidirectional propeller is used, the speed range N B min1 =0,N B min2 =0, ..., NB min n = 0. If a bidirectional rotating thruster is adopted, the rotational speed range is N B min1 = N B max1 , N B min2 = N B max2 ..., N B min n = N B max n ;

[0011] When a fault occurs in the power generation unit, it is recorded as fault condition S1. When a fault occurs in the ring-shaped DC busbar, it is recorded as fault condition S2. When a fault occurs in the load unit, it is recorded as fault condition S3; The low-speed mode of the diesel generator is recorded as K1, and the high-speed mode of the diesel generator is recorded as K2;

[0012] All diesel generators are operating and in the high-speed mode, which is recorded as operating mode H1. All diesel generators are operating and in the low-speed mode, which is recorded as operating mode H2. The situation where not all diesel generators are operating is recorded as operating mode H3;

[0013] The torque of the diesel generator before the fault in the faulty section is recorded as T 故 , the rotational speed of the diesel generator before the fault in the faulty section is recorded as N 故 , the power reduced due to the fault is recorded as P 故 , the system safety threshold is recorded as ΔP, the low-speed mode of the diesel generator is recorded as K1 and the high-speed mode is recorded as K2, and the power difference between the low-speed mode K1 and the high-speed mode K2 of the diesel generator is recorded as P 差 ;

[0014] Its fault detection and handling method specifically includes the following steps:

[0015] Step 1: Operating state detection and fault judgment

[0016] Step 1.1: Detect the rotational speed of the diesel generator

[0017] S1.1.1: The system detects the rotational speed N of the diesel generator through the rotational speed sensor M Ai (i = 1, 2, 3, 4) Ai ;

[0018] S1.1.2: If N Amin ≤ N Ai ≤ N Amax , proceed to step 1.1.3; otherwise, determine that the i-th section is the faulty section and the fault condition is S1, and control the main circuit breaker S of the busbar A(2i-1) , S A2i to disconnect and enter step 2;

[0019] S1.1.3: If i < n, let i = i + 1 and enter step 1.1.1; otherwise, enter step 1.2;

[0020] Step 1.2: Detect the current of the AC / DC module

[0021] S1.2.1: The system detects the current I of the AC / DC module through the current sensor J Ai (i = 1, 2, 3, 4); Ai ;

[0022] S1.2.2: If I mini ≤I Ai ≤I maxi , proceed to step 1.2.3; otherwise, determine that the i-th segment is a faulty segment, which is the fault condition S1, control the main bus circuit breaker S A(2i-1) , S A2i to disconnect and enter step two;

[0023] S1.2.3: If i < n, set i = i + 1 and enter step 1.1.1; otherwise, enter step 1.3;

[0024] Step 1.3: Detect the bus current

[0025] S1.3.1: The system detects the bus current I through the current sensor J Bi (i = 1, 2, 3, 4); Bi ;

[0026] S1.3.2: If I Bi ≠I Ai , proceed to step 1.3.3; otherwise, determine that the i-th segment is a faulty segment, which is the fault condition S2, control the main bus circuit breaker S A(2i-1) , S A2i to disconnect and enter step two;

[0027] S1.3.3: If i < n, set i = i + 1 and enter step 1.3.1; otherwise, enter step 1.4;

[0028] Step 2.4: Detect the current of the DC / AC module

[0029] S1.4.1: The system detects the current I of the DC / AC module through the current sensor J Ci (i = 1, 2, 3, 4); Ci ;

[0030] S1.4.2: If I mini ≤I Ci ≤I maxi , proceed to step 1.4.3; otherwise, determine that the i-th segment is a faulty segment, which is the fault condition S3, control the main bus circuit breaker S A(2i-1) , S A2i to disconnect and enter step two;

[0031] S1.4.3: If i < n, set i = i + 1 and go to step 1.4.1; otherwise, go to step 1.5;

[0032] Step 1.5: Detect the thruster speed

[0033] S1.5.1: The system detects the thruster speed N through the speed sensor M Bi (i = 1, 2, 3, 4) Bi ;

[0034] S1.5.2: If N Bmin ≤ N Bi ≤ N Bmax , go to step 1.5.3; otherwise, determine that the i-th segment is a fault segment, for the fault situation S3, control the main bus line circuit breaker S A(2i-1) , S A2i to disconnect and go to step two;

[0035] S1.5.3: If i < n, set i = i + 1 and go to step 1.5.1; otherwise, end;

[0036] Step two: Open and close the circuit breaker according to the fault situation

[0037] If it is the fault situation S1, that is, when the power generation unit fails, the system controls the circuit breaker S at the i-th segment diesel generator Ci to disconnect; the system controls the circuit breaker S of the main line of the i-th segment bus A(2i-1) , S A2i to close; then go to step three;

[0038] If it is the fault situation S2, that is, when the ring-shaped DC busbar fails, judge if i = 1 or i = 4, then close the circuit breaker S on the busbar branch B1 or S B3 ; if i = 2 or i = 3, then close the circuit breaker S on the busbar branch B1 , S B2 or S B2 , S B3 ; then go to step three;

[0039] If it is the fault situation S3, that is, when the load unit fails, the system controls the circuit breaker S at the i-th segment thruster Di to disconnect; the system controls the circuit breaker S of the main line of the i-th segment bus A(2i-1) , S A2i to close; then go to step three;

[0040] Step three: Enable the standby machine or perform mode conversion

[0041] All diesel generators are working in high-speed mode, which is recorded as working mode H1; all diesel generators are working in low-speed mode, which is recorded as working mode H2; and the mode in which not all diesel generators are working is recorded as working mode H3;

[0042] Working mode H1, working mode H2 and working mode H3 are selected manually. When working mode H1 is selected, S3.1 is executed; when working mode H2 is selected, S3.2 is executed; when working mode H3 is selected, S3.3 is executed;

[0043] S3.1: Working mode H1

[0044] S3.1.1: Read the diesel generator torque T before the fault according to the torque sensor memory function 故 , read the diesel generator speed N before the fault according to the speed sensor memory function 故 ;

[0045] S3.1.2: By formula The reduced power P 故 ;

[0046] S3.1.3: If P 故 ≤ΔP, the system operates normally and enters step 1; otherwise, manual processing is performed;

[0047] Step 3.2: Working Mode H2

[0048] S3.1.1: Read the diesel engine torque T before the fault according to the torque sensor memory function 故 , read the diesel engine speed N before the fault according to the speed sensor memory function 故 ;

[0049] S3.1.2: By formula The reduced power P 故 ;

[0050] S3.2.3: If P 故 ≤ΔP, the system operates normally and enters step 1; otherwise, the i (i=1, 2, 3, 4) diesel generators in the working sequence are controlled to switch from working mode K1 to working mode K2, so that P 故 ≤ΔP+(n-1)*P 差 ;

[0051] S3.2.4: If n = 4 and P 故 >ΔP+3P 差 , then perform manual processing; after returning to normal, proceed to step 1;

[0052] Step 3.3: Working Mode H3

[0053] S3.3.1: Read the diesel generator torque T before the fault according to the torque sensor memory function 故 , read the diesel generator speed N before the fault according to the speed sensor memory function 故 ;

[0054] S3.3.2: By formula The reduced power P 故 ;

[0055] S3.3.3: If P 故 ≤ΔP, the system operates normally; otherwise, according to the working mode of the diesel generator set before the fault, a diesel generator is started from the diesel generators in the non-working sequence and switched to working mode K1 or working mode K2.

[0056] The beneficial effects of the present invention are:

[0057] 1. This method constructs a marine ring busbar power supply device consisting of five sections of DC busbars. By detecting each section separately and closing the circuit breaker in different ways according to the fault situation, the non-faulty part of the faulty section can be retained and the faulty part can be disconnected. When a fault occurs, the working state of the entire busbar is not affected, and the non-faulty part of the faulty section can continue to work.

[0058] 2. The top-down segmented detection method of "generator busbar load" can quickly detect the specific fault location with high detection efficiency, which can minimize the impact of the fault.

[0059] 3. According to different working modes, corresponding troubleshooting methods are given to enable the entire system to be automatically adjusted to the greatest extent possible and reduce manual processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a schematic diagram of the composition of the annular DC busbar power supply device of the present invention;

[0061] Figure 2 It is a flow chart of the fault detection and processing method of the annular DC busbar power supply device of the present invention;

[0062] In the figure: 100 power generation unit, 200 DC busbar, 300 load unit; 110 power generation module 1, 120 power generation module 2, 130 power generation module 3, 140 power generation module 4, 210 DC busbar main line, 220 DC busbar branch line; 310 load module, 320 load module, 330 load module, 340 load module. DETAILED DESCRIPTION

[0063] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0064] like Figure 1-2 As shown, a fault detection and processing method for a ring-shaped DC busbar power supply device, wherein the marine ring-shaped DC busbar power supply device includes a power generation unit 100, a ring-shaped DC busbar 200, and a load unit 300. The power generation unit 100 provides power to the load unit 300 through the ring-shaped DC busbar 200; the power generation unit 100 includes four groups of power generation modules 110, 120, 130, and 140 with the same structure. Each power generation module includes a diesel generator and an AC / DC conversion module connected in sequence. Torque sensors K are provided at the four diesel generators. A1 , K A2 , K A3 , K A4 ; Circuit breakers S are set between the four diesel generators and the corresponding AC / DC conversion modules C1 , S C2 , S C3 , S C4 ;

[0065] The annular DC busbar 200 is provided with five sections of DC busbar main lines 210 and three sections of DC busbar branch lines 220, and the five sections of DC busbar main lines are connected end to end in sequence; the output ends of the four AC / DC conversion modules are connected to the first section of the busbar main line to the fourth section of the busbar main line in sequence,

[0066] One end of the three-section busbar branch line 220 is respectively arranged at the node between the first section busbar main line and the second section busbar main line, the second section busbar main line and the third section busbar main line, and the third section busbar main line and the fourth section busbar main line, and the other end of the three-section busbar branch line 220 is connected to the fifth section busbar main line; the three-section busbar branch line 220 is respectively provided with a circuit breaker S B1 , S B2 , S B3 ;

[0067] A circuit breaker S is arranged on the left and right sides of each AC / DC conversion module and the corresponding DC busbar main line connection point. A1 , S A2 …S A8 ; Current sensors J are respectively provided on the first busbar main line to the fourth busbar main line B1 , J B2 , J B3 , J B4 ; Current sensors J are set at the output ends of the four AC / DC conversion modules A1 , J A2 , J A3 , J A4 ; Speed ​​sensors M are installed at all four diesel generators A1 , M A2 , MA3 , M A4 ;

[0068] The load unit 300 includes four load modules 310, 320, 330, 340, each of which includes a DC / AC conversion module, a motor and a propeller connected in sequence, and a circuit breaker S is installed between the four DC / AC conversion modules and the four motors. D1 , S D2 , S D3 S D4 ; All four propellers are equipped with speed sensors M B1 , M B2 , M B3 , M B4 ; Current sensors J are provided at all four DC / AC conversion modules C1 , J C2 , J C3 , J C4 ;

[0069] The speeds of the four diesel generators are denoted as N A1 , N A2 , N A3 , N A4 When working normally, its operating speed range is recorded as N A min1 ~N A nax1 , N A min2 ~N A max2 , N A min3 ~N A nax3 , N A min4 ~N A max4 , the current sensor of the AC / DC module collects the current and records it as I A1 , I A2 , I A3 , I A4 The normal operating current range of the first busbar main line to the fourth busbar main line is recorded as I min1 ~I max1 , I min2 ~I max2 , ..., I min n ~I max n , current I min1 , I min2 ,…,I min n If the negative current is detected, it is considered as reverse power. If it exceeds the corresponding I max1 , I max2 ,…,I max n It is judged as overload; the current collected by the current sensor of the first to fourth busbar main lines is recorded as I B1 , I B2 , I B3 , IB4 , the current collected by the four DC / AC module current sensors is recorded as I C1 , I C2 , I C3 , I C4 , the speed of the four propellers is recorded as N B1 , N B2 , N B3 , N B4 , the normal operating range of the four thrusters is recorded as N B min1 ~N B max1 , N B min2 ~N B max2 , ..., K B min n ~N B max n ; If a unidirectional propeller is used, the speed range N B min1 =0,N B min2 =0, ..., N B min n = 0, if a bidirectional propeller is used, the speed range is N B min1 =N B max1 , N B min2 =-N B max2 ..., N B min n =-N B max n ;

[0070] When the power generation unit 100 fails, it is recorded as fault condition S1, when the annular DC busbar 200 fails, it is recorded as fault condition S2, and when the load unit 300 fails, it is recorded as fault condition S3; the low-speed mode of the diesel generator is recorded as K1, and the high-speed mode of the diesel generator is recorded as K2;

[0071] All diesel generators are working and all are in high-speed mode, which is recorded as working mode H1; all diesel generators are working and all are in low-speed mode, which is recorded as working mode H2; and the situation where not all diesel generators are working is recorded as working mode H3;

[0072] The torque of the diesel generator before the fault section is recorded as T 故 , the diesel generator speed before the fault is recorded as N 故 , the power reduced due to the fault is recorded as P 故 , the system safety threshold is denoted as ΔP, the diesel generator low speed mode is denoted as K1 and the high speed mode is denoted as K2, and the power difference between the diesel generator low speed mode K1 and the high speed mode K2 is denoted as P 差 ;

[0073] The fault detection and processing method specifically includes the following steps:

[0074] Step 1: Running status detection and fault diagnosis

[0075] Step 1.1: Detect the diesel generator speed

[0076] S1.1.1: The system detects the rotational speed N of the diesel generator through the rotational speed sensor M Ai (i = 1, 2, 3, 4); Ai ;

[0077] S1.1.2: If N Amin ≤N Ai ≤N Amax , proceed to step 1.1.3; otherwise, determine that the i-th segment is a fault segment and is in fault condition S1, control the main bus circuit breaker S A(2i-1) , S A2i to disconnect and enter step two;

[0078] S1.1.3: If i < n, set i = i + 1 and enter step 1.1.1; otherwise, enter step 1.2;

[0079] Step 1.2: Detect the current of the AC / DC module

[0080] S1.2.1: The system detects the current I of the AC / DC module through the current sensor J Ai (i = 1, 2, 3, 4); Ai ;

[0081] S1.2.2: If I mini ≤I Ai ≤I maxi , proceed to step 1.2.3; otherwise, determine that the i-th segment is a fault segment and is in fault condition S1, control the main bus circuit breaker S A(2i-1) , S A2i to disconnect and enter step two;

[0082] S1.2.3: If i < n, set i = i + 1 and enter step 1.1.1; otherwise, enter step 1.3;

[0083] Step 1.3: Detect the bus current

[0084] S1.3.1: The system detects the bus current I through the current sensor J Bi (i = 1, 2, 3, 4); Bi ;

[0085] S1.3.2: If I Bi ≠I Ai , proceed to step 1.3.3; otherwise, determine that the i-th segment is a fault segment and is in fault condition S2, control the main bus circuit breaker S A(2i-1) , S A2i to disconnect and enter step two;

[0086] S1.3.3: If i < n, let i = i + 1 and go to step 1.3.1; otherwise, go to step 1.4;

[0087] Step 2.4: Detect the current of the DC / AC module

[0088] S1.4.1: The system detects the current I of the DC / AC module through the current sensor J ci (i = 1, 2, 3, 4) Ci ;

[0089] S1.4.2: If I mini ≤ I Ci ≤ I maxi go to step 1.4.3; otherwise, determine that the i-th segment is a fault segment, for the fault situation S3, control the main bus line breaker S A(2i-1) , S A2i to disconnect and go to step two;

[0090] S1.4.3: If i < n, let i = i + 1 and go to step 1.4.1; otherwise, go to step 1.5;

[0091] Step 1.5: Detect the propeller speed

[0092] S1.5.1: The system detects the propeller speed N through the speed sensor M Bi (i = 1, 2, 3, 4) Bi ;

[0093] S1.5.2: If N Bmin ≤ N Bi ≤ N Bmax , go to step 1.5.3; otherwise, determine that the i-th segment is a fault segment, for the fault situation S3, control the main bus line breaker S A(2i-1) , S A2i to disconnect and go to step two;

[0094] S1.5.3: If i < n, let i = i + 1 and go to step 1.5.1; otherwise, end;

[0095] Step two: Open and close the circuit breaker according to the fault situation

[0096] If it is the fault situation S1, that is, when the power generation unit 100 fails, the system controls the circuit breaker S at the i-th segment diesel generator to Ci disconnect; the system controls the circuit breaker S of the main line of the i-th segment bus A(2i-1) , S A2i to close; then go to step three;

[0097] If the fault condition is S2, that is, when the ring DC busbar 200 fails, if i=1 or i=4, the circuit breaker S on the busbar branch line is closed. B1 or S B3 ; If i = 2 or i = 3, close the circuit breaker S on the busbar branch line B1 , S B2 or S B2 , S B3 ; Then proceed to step three;

[0098] If the fault condition S3 is that the load unit 300 fails, the system controls the circuit breaker S at the i-th thruster. Di Disconnect; the system controls the circuit breaker S of the main line of the busbar section i A(2i-1) , S A2i Close; then go to step three;

[0099] Step 3: Activate the standby machine or switch the mode

[0100] All diesel generators are working in high-speed mode, which is recorded as working mode H1; all diesel generators are working in low-speed mode, which is recorded as working mode H2; and the mode in which not all diesel generators are working is recorded as working mode H3;

[0101] Working mode H1, working mode H2 and working mode H3 are selected manually. When working mode H1 is selected, S3.1 is executed; when working mode H2 is selected, S3.2 is executed; when working mode H3 is selected, S3.3 is executed;

[0102] S3.1: Working mode H1

[0103] S3.1.1: Read the diesel generator torque T before the fault according to the torque sensor memory function 故 , read the diesel generator speed N before the fault according to the speed sensor memory function 故 ;

[0104] S3.1.2: By formula The reduced power P 故 ;

[0105] S3.1.3: If P 故 ≤ΔP, the system operates normally and enters step 1; otherwise, manual processing is performed;

[0106] Step 3.2: Working Mode H2

[0107] S3.1.1: Read the diesel engine torque T before the fault according to the torque sensor memory function 故 , read the diesel engine speed N before the fault according to the speed sensor memory function 故 ;

[0108] S3.1.2: By formula The reduced power P 故 ;

[0109] S3.2.3: If P 故 ≤ΔP, the system operates normally and enters step 1; otherwise, the i (i=1, 2, 3, 4) diesel generators in the working sequence are controlled to switch from working mode K1 to working mode K2, so that P 故 ≤ΔP+(a-1)*P 差 ;

[0110] S3.2.4: If n = 4 and P 故 >ΔP+3P 差 , then perform manual processing; after returning to normal, proceed to step 1;

[0111] Step 3.3: Working Mode H3

[0112] S3.3.1: Read the diesel generator torque T before the fault according to the torque sensor memory function 故 , read the diesel generator speed N before the fault according to the speed sensor memory function 故 ;

[0113] S3.3.2: By formula The reduced power P 故 ;

[0114] S3.3.3: If P 故 ≤ΔP, the system operates normally; otherwise, according to the working mode of the diesel generator set before the fault, a diesel generator is started from the diesel generators in the non-working sequence and switched to working mode K1 or working mode K2.

[0115] The above-mentioned embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A method for fault detection and processing of a marine annular DC busbar power supply device, wherein: The marine annular DC busbar power supply device comprises a power generation unit (100), an annular DC busbar (200), and a load unit (300). The power generation unit (100) provides electric energy to the load unit (300) via the annular DC busbar (200). The power generation unit (100) comprises four groups of power generation modules 1 (110), 2 (120), 3 (130), and 4 (140) with the same structure. Each power generation module comprises a diesel generator and an AC / DC conversion module connected in sequence. Torque sensors K are arranged at the four diesel generators. A1 , K A2 , K A3 , K A4 ; Circuit breakers S are set between the four diesel generators and the corresponding AC / DC conversion modules C1 , S C2 , S C3 , S C4 ; The annular DC busbar (200) is provided with five sections of DC busbar main lines (210) and three sections of DC busbar branch lines (220), and the five sections of DC busbar main lines are connected end to end in sequence; the output ends of the four AC / DC conversion modules are connected to the first section of the busbar main line to the fourth section of the busbar main line in sequence, One end of the three-section busbar branch line (220) is respectively arranged at the node between the first section busbar main line and the second section busbar main line, the second section busbar main line and the third section busbar main line, and the third section busbar main line and the fourth section busbar main line, and the other end of the three-section busbar branch line (220) is connected to the fifth section busbar main line; the three-section busbar branch line (220) is respectively provided with a circuit breaker S B1 , S B2 , S B3 ; A circuit breaker S is arranged on the left and right sides of the connection point between each AC / DC conversion module and the corresponding DC busbar main line (210). A1 , S A2 …S A8 ; Current sensors are installed on the first busbar main line to the fourth busbar main line Current sensors J are set at the output ends of the four AC / DC conversion modules. A1 , J A2 , J A3 , J A4 ; Speed ​​sensors M are installed at all four diesel generators A1 , M A2 , M A3 , M A4 ; The load unit (300) comprises four load modules (310), (320), (330), and (340), each of which comprises a DC / AC conversion module, a motor, and a propeller connected in sequence, and a circuit breaker S is installed between the four DC / AC conversion modules and the four motors. D1 , S D2 , S D3 S D4 ; All four propellers are equipped with speed sensors M B1 , M B2 , M B3 , M B4 ; Current sensors J are provided at all four DC / AC conversion modules C1 , J C2 , J C3 , J C4 ; The speeds of the four diesel generators are denoted as N A1 , N A2 , N A3 , N A4 When working normally, its operating speed range is recorded as N A min 1 ~N A max 1 , N A min 2 ~N A max 2 , N A min 3 ~N A max 3 , N A min 4 ~N A max 4 , the current sensor of the AC / DC module collects the current and records it as I A1 , I A2 , I A3 , I A4 The normal operating current range of the first busbar main line to the fourth busbar main line is recorded as I min 1 ~I max 1 , I min 2 ~I max 2 , ..., I min n ~I max n , current I min 1 ,I min 2 ,…,I min n If the negative current is detected, it is considered as reverse power. If it exceeds the corresponding I max 1 ,I max 2 ,…,I max n It is judged as overload; the current collected by the current sensor of the first to fourth busbar main lines is recorded as I B1 , I B2 , I B3 , I B4 , the current collected by the four DC / AC module current sensors is recorded as I C1 , I C2 , I C3 , I C4 , the speed of the four propellers is recorded as N B1 , N B2 , N B3 , N B4 , the normal operating range of the four thrusters is recorded as N B min 1 ~N B max 1 , N B min 2 ~N B max 2 , ..., N B min n ~N B max n ; If a unidirectional propeller is used, the speed range N B min 1 =0,N B min 2 =0, ..., N B min n =0, if a bidirectional propeller is used, the speed range is N B min 1 =-N B max 1 , N B min 2 =-N B max 2 ...,N B min n =-N B max n ; When the power generation unit (100) fails, it is recorded as fault condition S1, when the annular DC busbar (200) fails, it is recorded as fault condition S2, and when the load unit (300) fails, it is recorded as fault condition S3; the low speed mode of the diesel generator is recorded as K1, and the high speed mode of the diesel generator is recorded as K2; All diesel generators are working and all are in high-speed mode, which is recorded as working mode H1; all diesel generators are working and all are in low-speed mode, which is recorded as working mode H2; and the situation where not all diesel generators are working is recorded as working mode H3; The torque of the diesel generator before the fault is recorded as T 故 , the speed of the diesel generator before the fault is recorded as N 故 , the power reduced due to the fault is recorded as P 故 , the system safety threshold is denoted as ΔP, the diesel generator low speed mode is denoted as K1 and the high speed mode is denoted as K2, and the power difference between the diesel generator low speed mode K1 and the high speed mode K2 is denoted as P 差 ; The fault detection and processing method specifically includes the following steps: Step 1: Running status detection and fault diagnosis Step 1.1: Detect the diesel generator speed S1.1.1: The system uses the speed sensor M Ai (i=1, 2, 3, 4) The diesel generator speed N is detected Ai ; S1.1.2: If N Amin ≤N Ai ≤N Amax , proceed to step 1.1.3; otherwise, the i-th section is determined to be a faulty section, and the fault condition is S1, and the bus main line circuit breaker S is controlled. A(2i-1) , S A2i Disconnect and go to step 2; S1.1.3: If i<n, let i=i+1 and go to step 1.1.1; otherwise, go to step 1.2; Step 1.2: Detect AC / DC module current S1.2.1: The system passes through the current sensor J Ai (i=1,2,34) detects the AC / DC module current I Ai ; S1.2.2: If I mini ≤I Ai ≤I maxi , proceed to step 1.2.3; otherwise, the i-th section is determined to be a faulty section, which is fault condition S1, and the bus main line circuit breaker S is controlled. A(2i-1) , S A2i Disconnect and go to step 2; S1.2.3: If i<n, let i=i+1 and go to step 1.1.1; otherwise, go to step 1.3; Step 1.3: Detect bus current S1.3.1: The system passes through the current sensor J Bi (i=1,2,3,4) detects the bus current I Bi ; S1.3.2: If I Bi ≠I Ai , proceed to step 1.3.3; otherwise, the i-th section is determined to be a faulty section, which is fault condition S2, and the busbar main line circuit breaker S is controlled. A(2i-1) , S A2i Disconnect and go to step 2; S1.3.3: If i<n, let i=i+1 and go to step 1.3.1; otherwise, go to step 1.4; Step 2.4: Detect DC / AC module current S1.4.1: The system passes the current sensor J Ci (i=1, 2, 3, 4) detects the DC / AC module current I Ci ; S1.4.2: If I mini ≤I Ci ≤I maxi Go to step 1.4.3; otherwise, the i-th section is determined to be a faulty section, which is fault condition S3, and the busbar main line circuit breaker S is controlled. A(2i-1) , S A2i Disconnect and go to step 2; S1.4.3: If i<n, let i=i+1 and go to step 1.4.1; otherwise, go to step 1.5; Step 1.5: Detect propeller speed S1.5.1: The system uses the speed sensor M Bi (i=1, 2, 3, 4) The propeller speed N is detected Bi ; S1.5.2: If N Bmin ≤N Bi ≤N Bmax , proceed to step 1.5.3; otherwise, the i-th section is determined to be a faulty section, which is fault condition S3, and the busbar main line circuit breaker S is controlled. A(2i-1) , S A2i Disconnect and go to step 2; S1.5.3: If i<n, set i=i+1 and go to step 1.5.1; otherwise, end; Step 2: Open and close the circuit breaker according to the fault situation If it is fault situation S1, that is, when the power generation unit (100) fails, the system controls the circuit breaker S at the i-th diesel generator Ci Disconnect; the system controls the circuit breaker S of the main line of the busbar section i A(2i-1) , S A2i Close; then go to step three; If it is fault condition S2, that is, when the ring DC busbar (200) fails, if i=1 or i=4, then the circuit breaker S on the busbar branch line is closed. B1 or S B3 ; If i = 2 or i = 3, close the circuit breaker S on the busbar branch line B1 , S B2 or S B2 , S B3 ; Then proceed to step three; If it is fault condition S3, i.e., the load unit (300) fails, the system controls the circuit breaker S at the i-th thruster. Di Disconnect; the system controls the circuit breaker S of the main line of the busbar section i A(2i-1) , S A2i Close; then go to step three; Step 3: Activate the standby machine or switch the mode All diesel generators are working in high-speed mode, which is recorded as working mode H1; all diesel generators are working in low-speed mode, which is recorded as working mode H2; and the mode in which not all diesel generators are working is recorded as working mode H3; Working mode H1, working mode H2 and working mode H3 are selected manually. When working mode H1 is selected, S3.1 is executed; when working mode H2 is selected, S3.2 is executed; when working mode H3 is selected, S3.3 is executed; S3.1: Working mode H1 S3.1.1: Read the diesel generator torque T before the fault according to the torque sensor memory function 故 , read the diesel generator speed N before the fault according to the speed sensor memory function 故 ; S3.1.2: By formula The reduced power P 故 ; S3.1.3: If P 故 ≤ΔP, the system operates normally and enters step 1; otherwise, manual processing is performed; Step 3.2: Working Mode H2 S3.1.1: Read the diesel engine torque T before the fault according to the torque sensor memory function 故 , read the diesel engine speed N before the fault according to the speed sensor memory function 故 ; S3.1.2: By formula The reduced power P 故 ; S3.2.3: If P 故 ≤ΔP, the system operates normally and enters step 1; otherwise, the i (i=1,2,3,4) diesel generators in the working sequence are controlled to switch from working mode K1 to working mode K2, so that P 故 ≤ΔP+(n-1)*P 差 ; S3.2.4: If n = 4 and P 故 >ΔP+3P 差 , then perform manual processing; after returning to normal, proceed to step 1; Step 3.3: Working Mode H3 S3.3.1: Read the diesel generator torque T before the fault according to the torque sensor memory function 故 , read the diesel generator speed N before the fault according to the speed sensor memory function 故 ; S3.3.2: By formula The reduced power P 故 ; S3.3.3: If P 故 ≤ΔP, the system operates normally; otherwise, according to the working mode of the diesel generator set before the fault, a diesel generator is started from the diesel generators in the non-working sequence and switched to working mode K1 or working mode K2.

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