CN110752576A - Ship-shore connection method and system - Google Patents

Ship-shore connection method and system Download PDF

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Publication number
CN110752576A
CN110752576A CN201910875246.6A CN201910875246A CN110752576A CN 110752576 A CN110752576 A CN 110752576A CN 201910875246 A CN201910875246 A CN 201910875246A CN 110752576 A CN110752576 A CN 110752576A
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CN
China
Prior art keywords
ship
shore
detection
power
protection setting
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Pending
Application number
CN201910875246.6A
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Chinese (zh)
Inventor
武迪
孙厚涛
黄健
骆健
俞拙非
赵晨
黄堃
杨文�
余昆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
NARI Group Corp
Nari Technology Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
NARI Group Corp
Nari Technology Co Ltd
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Application filed by State Grid Corp of China SGCC, State Grid Jiangsu Electric Power Co Ltd, NARI Group Corp, Nari Technology Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201910875246.6A priority Critical patent/CN110752576A/en
Publication of CN110752576A publication Critical patent/CN110752576A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00Details of emergency protective circuit arrangements
    • H02H1/0007Details of emergency protective circuit arrangements concerning the detecting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/006Calibration or setting of parameters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/083Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers

Abstract

The invention discloses a ship-shore connection method, which comprises the steps of carrying out equipotential detection on a ship side and a shore power side and carrying out insulation detection on a ship power grid; responding to the passing of the detection, and performing ship side and shore power side protection setting value matching; responding to the passing of the matching of the protection setting value, and controlling synchronous grid-connected closing; and carrying out ship load transfer until the ship is completely supplied with power by a shore power supply. A corresponding system is also disclosed. The invention carries out equipotential detection, insulation detection and protection setting value matching during connection, realizes detection and monitoring of the connection process, carries out synchronous grid-connected switch-on when the conditions of the grid-connected switch-on are met, and ensures the reliability of the connection.

Description

Ship-shore connection method and system
Technical Field
The invention relates to a ship shore connection method and a ship shore connection system, and belongs to the technical field of ship shore power.
Background
When a ship is in a port, a shore power supply is used for replacing a ship power generation auxiliary machine to provide electric energy, and the power required by loads such as a pump set, ventilation, illumination, communication and the like of the ship in the port is met. In the existing ship shore connection process, the automation degree is low, manual intervention is more, and the connection reliability cannot be guaranteed.
Disclosure of Invention
The invention provides a ship-shore connection method and a ship-shore connection system, which solve the problem that the connection reliability cannot be ensured in the existing connection process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a ship shore connection method comprises the following steps,
carrying out equipotential detection on a ship side and a shore power side and ship power grid insulation detection;
responding to the passing of the detection, and performing ship side and shore power side protection setting value matching;
responding to the passing of the matching of the protection setting value, and controlling synchronous grid-connected closing;
and carrying out ship load transfer until the ship is completely supplied with power by a shore power supply.
The equipotential detection process of the ship side and the shore power side is as follows,
and collecting the equipotential line connection state of the ship side and the shore power side, responding to the normal equipotential line connection, and detecting to pass.
The process of detecting the insulation of the ship power grid is that,
calculating the insulation resistance of the ship power grid to the ground;
in response to insulation resistance being equal to RA∥RB∥RCAnd the detection is passed; wherein R isA、RBAnd RCThe resistances of A, B and C to ground, respectively, are in parallel.
The process of matching the ship side and shore power side protection setting values comprises the following steps,
collecting ship side and shore power side protection setting values;
and responding to the condition that the ship side protection setting value is less than or equal to the shore power side protection setting value, judging that the ship side protection setting value can be connected to the power grid, and reducing the shore power side protection setting value according to the ship side protection setting value to enable the shore power system to be locked and trip a ship-shore connection loop before the ship side switch acts.
The process of synchronous grid-connected closing is as follows,
calculating the voltage difference, the frequency difference and the phase angle difference between the ship side and the shore side;
in response to the fact that the voltage difference and the frequency difference are smaller than a set value, estimating a closing phase angle difference during closing according to the voltage difference, the frequency difference, the phase angle difference and closing lead time;
and responding to the condition that the bank side is ahead of the ship side and is not greater than a threshold value when the closing phase angle difference meets the requirement, and sending a closing instruction.
And in the closing process, responding to the detection of excitation surge current, and limiting the surge current.
The process of the inrush current limitation is that,
collecting three-phase current on a shore power side;
obtaining zero, second and third harmonic components of each phase current through Fourier transformation;
amplifying each harmonic component to obtain additional damping control voltage of each harmonic component;
superposing each additional damping control voltage according to three phases to obtain a control voltage instruction under virtual damping control;
adding the fundamental wave control voltage command and the control voltage command under the virtual damping control to obtain a voltage control total command;
the voltage control general command drives the inverter to act after being modulated by PWM, and the inrush current is limited.
The process of transferring the load of the ship comprises the following steps,
and adjusting the ship generator and the shore power supply according to the same power change rate, increasing the active power output of the shore power supply to the ship auxiliary machine, and synchronously reducing the active processing of the ship auxiliary machine.
A ship shore connection system comprises a ship shore connection system,
a detection module: carrying out equipotential detection on a ship side and a shore power side and ship power grid insulation detection;
a fixed value matching module: responding to the passing of the detection, and performing ship side and shore power side protection setting value matching;
a grid-connected switching-on module: responding to the passing of the matching of the protection setting value, and controlling synchronous grid-connected closing;
a load transfer module: and carrying out ship load transfer until the ship is completely supplied with power by a shore power supply.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a ship-to-shore connection method.
The invention achieves the following beneficial effects: the invention carries out equipotential detection, insulation detection and protection setting value matching during connection, realizes detection and monitoring of the connection process, carries out synchronous grid-connected switch-on when the conditions of the grid-connected switch-on are met, and ensures the reliability of the connection.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic view of the marine vessel grid insulation;
FIG. 3 is a synchronous grid-connected closing flow chart;
FIG. 4 is a flow chart of inrush current limiting;
fig. 5 is a block diagram of the system of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
As shown in fig. 1, a ship shore connection method includes the following steps:
step 1, carrying out equipotential detection on a ship side and a shore power side and carrying out insulation detection on a ship power grid.
Step 2, if the detection is passed, carrying out ship side and shore power side protection setting value matching; otherwise, the shore power supply is disconnected.
Step 3, if the protection setting value is matched and passed, controlling synchronous grid-connected closing; otherwise, the ship side and the shore power side cannot be connected to the grid.
And 4, carrying out ship load transfer until the ship is completely supplied with power by the shore power side power supply.
The method performs equipotential detection, insulation detection and protection setting value matching during connection, realizes detection and monitoring of the connection process, performs synchronous grid-connected switching-on when the grid-connected switching-on condition is met, and ensures the reliability of connection.
Example 2
A ship-shore connection method is characterized in that a ship side and shore power side equipotential detection process is added on the basis of embodiment 1, and the specific process is as follows: and collecting the equipotential line connection state of the ship side and the shore power side, if the equipotential line connection is normal, detecting to pass, otherwise, detecting not to pass, and disconnecting the shore power supply.
The equipotential connection detection device is arranged at the shore power junction box, and the equipotential connection state of the ship side and the shore power side can be acquired through the equipotential connection detection device, so that equipotential detection is realized. The equipotential connection is identified as part of the shore safety circuit and the shore connection system will only allow further operations to be performed if the equipotential connection identifies a connection.
Example 3
A ship shore connection method is additionally provided with a ship power grid insulation detection process on the basis of embodiment 1, and the specific process is as follows:
11) and calculating the insulation resistance of the ship power grid to the ground.
A direct current signal is added between a certain phase of the ship power grid and a ship body, the resistances of a generator (transformer) and electric equipment of a cable line are ignored, and as shown in fig. 2, the insulation resistance R of the ship power grid to the ground is as follows:
R=RA//RB//RC
wherein R isA、RBAnd RCRespectively, a resistance to ground, B resistance to ground, and C resistance to ground.
12) If the insulation resistance is equal to RA∥RB∥RCIf the detection is passed, otherwise, the detection is not passed; wherein/represents a parallel connection.
When the ship is connected with shore power, when the ship shore insulation condition is good, the measured insulation resistance R is R ═ RA∥RB∥RCAt this time, R basically reflects the insulation condition of the ship power grid. When a ground fault occurs in one phase of the shore power (assumed as phase a), the measured insulation resistance R changes to R, and the measured new insulation resistance R' is equal to RB//RC//rs,rsRepresents the grounding resistance of the A phase, which is far less than RB、RC. Therefore, the insulation condition of the ship power grid can be judged according to the measured insulation resistance. When the insulation is normal, the ship shore allows connection, and when the insulation is in a problem, the ship shore does not allow connection.
Example 4
Because the ship side switch is set according to the short-circuit current of the ship side auxiliary machine, when the ship load is switched to the shore power supply for supplying power, the original protection setting value can not be matched with the working condition of shore power supply due to the fact that the short-circuit current levels of the ship side auxiliary machine and the shore power supply are inconsistent, and therefore protection setting needs to be carried out in the ship shore connection process. Therefore, a ship side and shore power side protection setting value matching process is added on the basis of the embodiment 1, and the specific process is as follows:
21) and collecting ship side and shore power side protection setting values and protection types.
22) If the ship side protection setting value is larger than the shore power side protection setting value, judging that grid connection cannot be carried out; if the ship side protection setting value is less than or equal to the shore power side protection setting value, judging that the ship side protection setting value can be connected to the power grid, and reducing the shore power side protection setting value according to the ship side protection setting value to enable a shore power system to be locked and trip a ship shore connection loop before the ship side switch acts, so that the problem that the ship side switch is difficult to cut off due to overlarge short-circuit current provided by the shore power when a short-circuit fault occurs on the ship side is solved.
Example 5
A ship shore connection method is characterized in that a synchronization grid-connected closing process is added on the basis of embodiment 1, and a capturing synchronization mode can be adopted during ship shore grid-connected synchronization control, and is specifically shown in figure 3:
31) and detecting that the PT on the ship side to be connected to the grid and the PT on the shore side are normal and the voltage is stable.
32) Calculating the voltage difference, the frequency difference and the phase angle difference between the ship side and the shore side;
33) if the voltage difference and the frequency difference are smaller than a set value, estimating a closing phase angle difference during closing according to the voltage difference, the frequency difference, the phase angle difference and closing lead time;
34) and if the closing phase angle difference meets the condition that the shore side is ahead of the ship side and is not greater than the threshold value, sending a closing instruction.
Example 6
In the ship bank switching-on process, the air charging transformer may generate excitation inrush current due to the effect of the switching-on angle and the residual magnetism of the transformer, and the excitation inrush current can damage a switching tube of the converter, so that an inrush current limiting process is added on the basis of the embodiment 1, and the process is specifically shown in fig. 4;
41) and collecting three-phase currents Ia, Ib and Ic on the shore power side.
42) After fourier transform, zero, second and third harmonic components f0, f2, f3 of the respective phase currents are obtained.
43) Amplifying each harmonic component by a preset current coefficient to obtain an additional damping control voltage of each harmonic component; the preset current coefficients are k0, k2 and k3 respectively corresponding to the zero harmonic component, the second harmonic component and the third harmonic component respectively.
44) And superposing the additional damping control voltages according to three phases to obtain a control voltage instruction under the virtual damping control.
45) And adding the fundamental wave control voltage command and the control voltage command under the virtual damping control to obtain a voltage control total command.
46) The voltage control general command drives the inverter to act after being modulated by PWM, and the inrush current is limited.
Example 7
A ship-shore connection method is characterized in that a ship load transfer process is added on the basis of embodiment 1, and the method specifically comprises the following steps: and adjusting the ship generator and the shore power supply according to the same power change rate, increasing the active power output of the shore power supply to the ship auxiliary machine, and synchronously reducing the active processing of the ship auxiliary machine.
The flexible grid connection is adopted for grid connection, a grid connection control strategy is divided into two parts, firstly, the outlet voltage of a shore power supply and the voltage information of a ship shore power distribution board are obtained, the shore power supply is regulated by taking the shore power supply as reference, when the synchronous condition is met, the switch-on is carried out, then, the current of a ship shore connection loop is controlled by using the Uac-I droop control strategy, the impact current of the two ship shore power supplies during grid connection is close to zero, the flexible ship shore grid connection is realized, the current-alternating voltage phase vector control technology can also be used for realizing, and finally, the ship load transfer is carried out.
Example 8
A method of shore connection, comprising the steps of:
step 1, carrying out equipotential detection on a ship side and a shore power side and carrying out insulation detection on a ship power grid.
The equipotential detection process of the ship side and the shore power side is as follows: and collecting the equipotential line connection state of the ship side and the shore power side, if the equipotential line connection is normal, detecting to pass, otherwise, detecting not to pass, and disconnecting the shore power supply.
The shore power junction box is provided with an equipotential connection detection device, and the equipotential connection state of the ship side and the shore power side can be acquired through the device, so that equipotential detection is realized. The equipotential connection is identified as part of the shore safety circuit and the shore connection system will only allow further operations to be performed if the equipotential connection identifies a connection.
The ship power grid insulation detection process comprises the following steps:
11) and calculating the insulation resistance of the ship power grid to the ground.
A direct current signal is added between a certain phase of the ship power grid and a ship body, the resistances of a generator (transformer) and electric equipment of a cable line are ignored, and as shown in fig. 2, the insulation resistance R of the ship power grid to the ground is as follows:
R=RA//RB//RC
wherein R isA、RBAnd RCRespectively, a resistance to ground, B resistance to ground, and C resistance to ground.
12) If the insulation resistance is equal to RA∥RB∥RCIf the detection is passed, otherwise, the detection is not passed; wherein/represents a parallel connection.
When the ship is connected with shore power, when the ship shore insulation condition is good, the measured insulation resistance R is R ═ RA∥RB∥RCAt this time, R basically reflects the insulation condition of the ship power grid. When a ground fault occurs in one phase of the shore power (assumed as phase a), the measured insulation resistance R changes to R, and the measured new insulation resistance R' is equal to RB//RC//rs,rsRepresents the grounding resistance of the A phase, which is far less than RB、RC. Therefore, the insulation condition of the ship power grid can be judged according to the measured insulation resistance. When the insulation is normal, the ship shore allows connection, and when the insulation is in a problem, the ship shore does not allow connection.
Step 2, if the detection is passed, carrying out ship side and shore power side protection setting value matching; otherwise, the shore power supply is disconnected.
Because the ship side switch is set according to the short-circuit current of the ship side auxiliary machine, when the ship load is switched to the shore power supply for supplying power, the original protection setting value can not be matched with the working condition of shore power supply due to the fact that the short-circuit current levels of the ship side auxiliary machine and the shore power supply are inconsistent, and therefore protection setting needs to be carried out in the ship shore connection process. The ship side and shore power side protection setting value matching process comprises the following steps:
21) and collecting ship side and shore power side protection setting values and protection types.
22) If the ship side protection setting value is larger than the shore power side protection setting value, judging that grid connection cannot be carried out; if the ship side protection setting value is less than or equal to the shore power side protection setting value, judging that the ship side protection setting value can be connected to the power grid, and reducing the shore power side protection setting value according to the ship side protection setting value to enable a shore power system to be locked and trip a ship shore connection loop before the ship side switch acts, so that the problem that the ship side switch is difficult to cut off due to overlarge short-circuit current provided by the shore power when a short-circuit fault occurs on the ship side is solved.
Step 3, if the protection setting value is matched and passed, controlling synchronous grid-connected closing; otherwise, the ship side and the shore power side cannot be connected to the grid.
The ship shore synchronization control can adopt a capturing synchronization mode, and the synchronization closing process is shown in fig. 3:
31) and detecting that the PT on the ship side to be connected to the grid and the PT on the shore side are normal and the voltage is stable.
32) Calculating the voltage difference, the frequency difference and the phase angle difference between the ship side and the shore side;
33) if the voltage difference and the frequency difference are smaller than a set value, estimating a closing phase angle difference during closing according to the voltage difference, the frequency difference, the phase angle difference and closing lead time;
34) and if the closing phase angle difference meets the condition that the shore side is ahead of the ship side and is not greater than the threshold value, sending a closing instruction.
In the ship bank switching-on process, the air charging transformer may generate excitation surge current due to the effect of the switching-on angle and the residual magnetism of the transformer, the size of the excitation surge current can damage a switching tube of the converter, and therefore when the excitation surge current is detected, surge current limitation needs to be carried out.
The inrush current limiting procedure, as shown in particular in fig. 4;
41) and collecting three-phase currents Ia, Ib and Ic on the shore power side.
42) After fourier transform, zero, second and third harmonic components f0, f2, f3 of the respective phase currents are obtained.
43) Amplifying each harmonic component by a preset current coefficient to obtain an additional damping control voltage of each harmonic component; the preset current coefficients are k0, k2 and k3 respectively corresponding to the zero harmonic component, the second harmonic component and the third harmonic component respectively.
44) And superposing the additional damping control voltages according to three phases to obtain a control voltage instruction under the virtual damping control.
45) And adding the fundamental wave control voltage command and the control voltage command under the virtual damping control to obtain a voltage control total command.
46) The voltage control general command drives the inverter to act after being modulated by PWM, and the inrush current is limited.
And 4, carrying out ship load transfer until the ship is completely supplied with power by the shore power side power supply.
The ship load transfer process specifically comprises the following steps: and adjusting the ship generator and the shore power supply according to the same power change rate, increasing the active power output of the shore power supply to the ship auxiliary machine, and synchronously reducing the active processing of the ship auxiliary machine.
The flexible grid connection is adopted for grid connection, a grid connection control strategy is divided into two parts, firstly, the outlet voltage of a shore power supply and the voltage information of a ship shore power distribution board are obtained, the shore power supply is regulated by taking the shore power supply as reference, when the synchronous condition is met, the switch-on is carried out, then, the current of a ship shore connection loop is controlled by using the Uac-I droop control strategy, the impact current of the two ship shore power supplies during grid connection is close to zero, the flexible ship shore grid connection is realized, the current-alternating voltage phase vector control technology can also be used for realizing, and finally, the ship load transfer is carried out.
The method performs equipotential detection, insulation detection and protection setting value matching during connection, realizes detection and monitoring of the connection process, performs synchronous grid-connected switching-on when the grid-connected switching-on condition is met, and ensures the reliability of connection.
Example 9
A ship shore connection system can be arranged independently as shown in figure 5, or can be inherited in the existing system, such as a shore power system and the like. The ship-shore connection system and the ship-borne communication equipment realize communication interaction through communication modes such as optical fiber communication, serial ports and carrier waves, and simultaneously detect data such as electric quantity, switching value, equipotential state and insulation state on two sides of a ship shore.
A ship shore connection system comprising:
a detection module: and carrying out equipotential detection on the ship side and the shore power side and ship power grid insulation detection.
A fixed value matching module: and responding to the passing of the detection, and carrying out ship side and shore power side protection setting value matching.
A grid-connected switching-on module: and responding to the passing of the matching of the protection setting value, and controlling synchronous grid-connected closing.
A load transfer module: and carrying out ship load transfer until the ship is completely supplied with power by a shore power supply.
Example 10
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a ship-to-shore connection method.
A computing device comprising one or more processors, memory, and one or more programs stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing a ship-to-shore connection method.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.

Claims (10)

1. A ship shore connection method is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
carrying out equipotential detection on a ship side and a shore power side and ship power grid insulation detection;
responding to the passing of the detection, and performing ship side and shore power side protection setting value matching;
responding to the passing of the matching of the protection setting value, and controlling synchronous grid-connected closing;
and carrying out ship load transfer until the ship is completely supplied with power by a shore power supply.
2. A ship shore connection method according to claim 1, characterized in that: the equipotential detection process of the ship side and the shore power side is as follows,
and collecting the equipotential line connection state of the ship side and the shore power side, responding to the normal equipotential line connection, and detecting to pass.
3. A ship shore connection method according to claim 1, characterized in that: the process of detecting the insulation of the ship power grid is that,
calculating the insulation resistance of the ship power grid to the ground;
in response to insulation resistance being equal to RA∥RB∥RCAnd the detection is passed; wherein R isA、RBAnd RCThe resistances of A, B and C to ground, respectively, are in parallel.
4. A ship shore connection method according to claim 1, characterized in that: the process of matching the ship side and shore power side protection setting values comprises the following steps,
collecting ship side and shore power side protection setting values;
and responding to the condition that the ship side protection setting value is less than or equal to the shore power side protection setting value, judging that the ship side protection setting value can be connected to the power grid, and reducing the shore power side protection setting value according to the ship side protection setting value to enable the shore power system to be locked and trip a ship-shore connection loop before the ship side switch acts.
5. A ship shore connection method according to claim 1, characterized in that: the process of synchronous grid-connected closing is as follows,
calculating the voltage difference, the frequency difference and the phase angle difference between the ship side and the shore side;
in response to the fact that the voltage difference and the frequency difference are smaller than a set value, estimating a closing phase angle difference during closing according to the voltage difference, the frequency difference, the phase angle difference and closing lead time;
and responding to the condition that the bank side is ahead of the ship side and is not greater than a threshold value when the closing phase angle difference meets the requirement, and sending a closing instruction.
6. A ship shore connection method according to claim 1, characterized in that: and in the closing process, responding to the detection of excitation surge current, and limiting the surge current.
7. A ship shore connection method according to claim 6, characterized in that: the process of the inrush current limitation is that,
collecting three-phase current on a shore power side;
obtaining zero, second and third harmonic components of each phase current through Fourier transformation;
amplifying each harmonic component to obtain additional damping control voltage of each harmonic component;
superposing each additional damping control voltage according to three phases to obtain a control voltage instruction under virtual damping control;
adding the fundamental wave control voltage command and the control voltage command under the virtual damping control to obtain a voltage control total command;
the voltage control general command drives the inverter to act after being modulated by PWM, and the inrush current is limited.
8. A ship shore connection method according to claim 1, characterized in that: the process of transferring the load of the ship comprises the following steps,
and adjusting the ship generator and the shore power supply according to the same power change rate, increasing the active power output of the shore power supply to the ship auxiliary machine, and synchronously reducing the active processing of the ship auxiliary machine.
9. A ship shore connection system, characterized in that:
a detection module: carrying out equipotential detection on a ship side and a shore power side and ship power grid insulation detection;
a fixed value matching module: responding to the passing of the detection, and performing ship side and shore power side protection setting value matching;
a grid-connected switching-on module: responding to the passing of the matching of the protection setting value, and controlling synchronous grid-connected closing;
a load transfer module: and carrying out ship load transfer until the ship is completely supplied with power by a shore power supply.
10. A computer readable storage medium storing one or more programs, characterized in that: the one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods of claims 1-8.
CN201910875246.6A 2019-09-17 2019-09-17 Ship-shore connection method and system Pending CN110752576A (en)

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