CN111585309A - Ship shore power bidirectional grid-connected control system - Google Patents
Ship shore power bidirectional grid-connected control system Download PDFInfo
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- CN111585309A CN111585309A CN202010500801.XA CN202010500801A CN111585309A CN 111585309 A CN111585309 A CN 111585309A CN 202010500801 A CN202010500801 A CN 202010500801A CN 111585309 A CN111585309 A CN 111585309A
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- ship
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a ship shore power bidirectional grid-connected control system, and relates to the technical field of port power supply. The shore power variable-voltage variable-frequency power supply is connected with an electric connection box through a ship shore connection switch and a transformer, and the electric connection box is connected with a first closing switch on the ship side; the ship power generation equipment, the ship power distribution unit and the ship load are connected through a ship power bus, and the ship power generation equipment is connected with the ship power distribution unit through a second closing switch; the intelligent control device is respectively connected with the shore power voltage and frequency conversion power supply and the ship power generation equipment, and comprises a data acquisition module, a control module, a display module and a human-computer interaction module. The invention has the advantages that: the intelligent control device can realize a bidirectional grid-connected function, can meet various different working environments, improves the technical effect of the utilization rate of the shore power, increases the stability of a shore power system, is more convenient and safer, and can reduce the cost.
Description
Technical Field
The invention relates to the technical field of port power supply, in particular to a ship shore power bidirectional grid-connected control system.
Background
In a port-berthing wharf, a ship power system adopts a diesel generator for power supply, so that the environmental pollution is serious, and in order to respond the national energy-saving and emission-reduction policy, the power supply of the ship generator is cut off during the port-berthing period of the ship, and a shore power supply is changed into the shore power supply for supplying power to the ship. When the berthing wharf is an island reef, a marine working platform and other special environments, the output voltage of the ship generator needs to be adjusted due to lack of equipment conditions, so that the output voltage of the ship generator is synchronous with a shore power supply. In the prior art, the automatic ship grid-connection device is usually arranged on a ship, and when the automatic ship side generator grid-connection system fails, shore power cannot be automatically connected.
In the prior art, a bidirectional grid-connected system of a variable-frequency shore power supply with application number 201820001278.4 is disclosed, wherein a frequency converter of the grid-connected system has an automatic grid-connected function, an additional automatic grid-connected device is not required to be added, the automatic grid-connected function of the variable-frequency power supply can be used after the automatic grid-connected device of a ship fails, and the reliability of the grid-connected system is improved. Therefore, a bank power system bidirectional grid-connected control system needs to be designed to solve the above problems.
Disclosure of Invention
The invention aims to provide a ship shore power bidirectional grid-connected control system, which is suitable for various working environments, can perform unified automatic grid-connected control and can avoid the problem that a ship generator fails to be connected to the grid due to failure.
In order to solve the technical problems, the technical scheme of the invention is as follows: comprises that
The shore power device comprises a commercial power supply, an emergency switch, a shore power transformation variable-frequency power supply, a ship shore connection switch, a transformer and a power connection box, wherein the shore power transformation variable-frequency power supply comprises a rectifying part, a filtering part and an inverting part and is connected with the commercial power supply through the emergency switch;
the ship power device comprises ship power generation equipment, a ship power distribution unit, a ship load and a second closing switch, wherein the ship power generation equipment, the ship power distribution unit and the ship load are connected through a ship power bus, and the ship power generation equipment is connected with the ship power distribution unit through the second closing switch;
the intelligent control device comprises a data acquisition module, a control module, a display module and a man-machine interaction module, wherein the data acquisition module is connected with the shore power variable-voltage power supply and the ship power generation equipment and is used for acquiring the voltage, the frequency and the phase of the shore power variable-voltage power supply and the ship;
the control module is respectively connected with the shore power variable-voltage variable-frequency power supply and the ship power generation equipment, and the control module is provided with a speed regulation and excitation control module for the ship power generation equipment and a control algorithm module for the shore power variable-voltage variable-frequency power supply inverter.
Further, the shore power frequency conversion and voltage transformation power supply is provided with a voltage adjusting device and a frequency adjusting device.
Further, the marine power generation equipment is a diesel generator set.
Further, the marine power plant is a generator with reverse power protection.
The invention has the advantages that: an intelligent control device is arranged at a shore side wharf, so that the characteristics of easiness in maintenance and convenience in operation are achieved, meanwhile, the intelligent control device can adjust small-capacity system parameters to follow large-capacity system parameters, a bidirectional grid-connected function is achieved, grid-connected operation specifications are met, various different working environments can be met, and the intelligent control device is more reasonable and safer than the prior art; the technical means can also achieve the technical effects of mutual redundancy and improvement of the utilization rate of the shore power, increase the stability of a shore power system, are more convenient and safer, and can reduce the cost.
Drawings
FIG. 1 is a grid-connected control structure diagram of a ship shore power bidirectional grid-connected control system of the invention;
FIG. 2 is a control diagram of the speed regulation and virtual speed regulation of the present invention;
FIG. 3 is a control diagram of excitation and virtual excitation of the present invention;
FIG. 4 is a diagram of a virtual synchronous generator control algorithm of the present invention;
fig. 5 is a diagram of a control algorithm switching process of the bidirectional grid-connected control system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and the detailed description. The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
As shown in fig. 1, the following technical solutions are adopted in the present embodiment: the shore power device comprises a mains supply 1, an emergency switch SE1, a shore power transformation variable-frequency power supply 2, a ship shore connection switch SE2, a transformer 4 and a power connection box 6, wherein the shore power transformation variable-frequency power supply 2 comprises a rectification part, a filtering part and an inversion part and is connected with the mains supply 1 through an emergency switch SE1, the output of the shore power transformation variable-frequency power supply 2 is connected with the power connection box 6 through a ship shore connection SE2 switch and the rear part of the transformer 4, and the power connection box 6 is connected with a first switch-on switch S1 on the ship side;
the ship power device comprises a ship power generation device 5, a ship power distribution unit 7, a ship load and a second closing switch S2, wherein the ship power generation device 5, the ship power distribution unit 7 and the ship load are connected through a ship power bus, and the ship power generation device 5 is connected with the ship power distribution unit 7 through the second closing switch S2;
the intelligent control device 3 is respectively connected with the shore power voltage-transformation variable-frequency power supply 2 and the ship power generation equipment 5, and is used for receiving shore power voltage, frequency and phase from the shore power voltage-transformation variable-frequency power supply 2, receiving ship voltage, frequency and phase from the ship power generation equipment 5, and adjusting the output of the shore power voltage-transformation variable-frequency power supply 2 or the output of the ship power generation equipment 5.
The intelligent control device 3 comprises a data acquisition module, a control module, a display module and a man-machine interaction module, wherein the data acquisition module is connected with the shore power frequency conversion and voltage transformation power supply 2 and the ship power generation equipment 5 and is used for acquiring conversion voltage and ship voltage, including phase sequence, amplitude, frequency and phase difference of the voltage.
The control module is connected with the data acquisition module and is used for receiving the converted voltage phase sequence, the ship voltage phase sequence, the converted voltage amplitude and the ship voltage amplitude from the data acquisition module, and the conversion voltage frequency and the ship voltage frequency, as well as the conversion voltage phase angle and the ship voltage phase angle are compared and judged to judge whether the grid-connected closing condition is met, and calculates the control signal according to the grid-connected closing condition control module, outputs the control signal to the shore power voltage transformation variable frequency power supply 2 or the ship power generation equipment 5 to send out an adjusting signal, and realizes the sending of start-stop control instructions to the ship power generation equipment 5, the control module adopts a virtual synchronous generator control method, as shown in fig. 4, the two-way control of the shore-based power variable frequency and voltage power supply 2 and the ship power generation equipment 5 is realized, the power variable frequency and voltage power supply passes through the synchronization module before grid connection, and the grid connection can be performed only when grid connection conditions are met.
And the display module is respectively connected with the shore power voltage transformation variable-frequency power supply 2 and the ship power generation equipment 5 and is used for displaying the real-time voltage of the transformation voltage and the ship voltage, displaying whether the shore power voltage transformation variable-frequency power supply 2 and the ship power generation equipment 5 are successfully switched, and the like.
And the man-machine interaction module is connected with the shore power transformation and frequency conversion device 2 and the ship power generation equipment 5 and is used for selecting to send a grid-connected instruction to shore power or a ship so as to complete one-key grid-connected operation control.
When a ship is berthed, the data acquisition module can acquire data parameters and equipment conditions of a shore side and a ship side and judge which party is regulated; when berthhing some reef, because of the relative disappearance of reef bank side equipment, can not detect the dc-to-ac converter, then adjust the ship side, simultaneously, man-machine interaction module also can be according to artifical judgement, and manual setting is adjusted the bank side or the ship side.
The commercial power 1 provides electric energy for a shore power grid-connected system and is 10kV a.c of a conventional power grid; the emergency switch SE1 is on the right side of the power supply: emergency disconnection is carried out when a fault occurs, so that the safety of the shore power assembly and the ship power assembly equipment is ensured; shore power frequency conversion voltage transformation power supply 2: voltage regulation and frequency modulation control are carried out on a power grid power supply, and the voltage and the frequency of a shore power system are stabilized; intelligent control device 3: adjusting and controlling a shore power two-way grid-connected system based on a data acquisition module, a virtual synchronous generator control module, a display module and a human-computer interaction module control system; ship-shore connection switch SE 2: when the variable frequency power supply meets the requirements of grid-connected conditions, the switch is controlled by the variable frequency power supply to be switched on and connected to the grid; and 4, a transformer: the shore side and the ship side are electrically insulated, the loop is also isolated, personal safety is protected, and dangerous voltage is isolated; first closing switch S1: the closing switch is used for supplying power to the shore power supply and is connected with the shore power supply and the ship load; second closing switch S2: the closing switch is used for supplying power to the ship generator and is connected with a ship power supply and a ship load; marine power generation equipment 5: is a diesel generator set and has the function of reverse power protection.
As shown in fig. 2-5, the control module employs virtual synchronous generator control. FIG. 2 is a diagram of a speed regulation and virtual speed regulation control structure; FIG. 3 is a diagram of excitation and virtual excitation control architecture; fig. 4 is a diagram of a virtual synchronous generator control algorithm. And inputting corresponding parameters for regulation control according to different selected control objects.
When a ship stops at an island or an offshore floating platform and other special environments, and the shore side does not have variable-frequency variable-voltage power supply equipment, the parameters of the ship generator are adjusted to be synchronous with the power supply of the island or the offshore working platform, at the moment, the acquisition module acquires the parameter information of the ship power generation equipment, and the speed-adjusting control module outputs active power PmAdjusting the ship generator, wherein omega is the voltage frequency of the output end of the ship generator, omega0For angular frequency, P, of the vessel's power systemrefFor a given value of the output active power, P, of a marine generatormFor the output of active power, K, of a marine generatorpThe sag factor. The excitation controller regulates the output voltage of the marine generator, wherein QrefIs the reactive given value of the generator, Q is the reactive value of the generator, UrefIs given value of voltage, U is output voltage of the generator, E is output voltage value, DqTo a reactive regulation factor, KuIs a voltage regulation factor.
When ships are in port, along a seaside wharf, an inland river wharf and the like, the shore side is provided with variable-frequency variable-voltage power supply equipment, so that the output voltage of a shore power supply can be adjusted, and the shore power supply is synchronous with a ship generator. At the moment, the acquisition module acquires the shore power supply parameter information, and the virtual speed regulation control module outputs active power PmRegulating the virtual synchronous generator, wherein omega is the voltage frequency of the shore power supply output end, and omega is0For the angular frequency, P, of a three-phase mains supplyrefGiven value of output active power P of shore power supplymFor virtual output of active power, KpThe sag factor. The virtual excitation controller regulates the output voltage of the shore power supply, wherein QrefOutputting a given value of reactive power for the shore power supply, wherein Q is the reactive value of the variable frequency power supply, UrefIs a given voltage value, U is the output voltage of the power supply, E is the output voltage value, DqTo a reactive regulation factor, KuIs a voltage regulation factor. Adding the above-mentioned PmSubstituting the virtual synchronous generator algorithm to obtain a phase angle theta of the virtual rotor shaft part, as shown in FIG. 4; the above E and theta inputsSynthesizing reference value voltage U into voltage synthesis module1. From the resulting voltage U1The control of the variable frequency power supply is completed as an input value generated by the SPWM, wherein PeIs the electromagnetic power, J is the moment of inertia, and D is the constant damping coefficient.
And sending a grid-connected instruction to shore power or a ship through the man-machine interaction module, and switching on each switch to complete one-key grid-connected operation control and complete grid connection.
This embodiment sets up intelligent control device at bank side pier, reaches easy maintenance, convenient operation's characteristics, and simultaneously, intelligent control device both can realize two-way function of being incorporated into the power networks, can satisfy the operational environment of multiple difference again, increases bank power system stability, and convenient safety more, and reducible cost.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The ship shore power bidirectional grid-connected control system is characterized in that: comprises that
The shore power device comprises a commercial power supply, an emergency switch, a shore power transformation variable-frequency power supply, a ship shore connection switch, a transformer and a power connection box, wherein the shore power transformation variable-frequency power supply comprises a rectifying part, a filtering part and an inverting part and is connected with the commercial power supply through the emergency switch;
the ship power device comprises ship power generation equipment, a ship power distribution unit, a ship load and a second closing switch, wherein the ship power generation equipment, the ship power distribution unit and the ship load are connected through a ship power bus, and the ship power generation equipment is connected with the ship power distribution unit through the second closing switch;
the intelligent control device comprises a data acquisition module, a control module, a display module and a man-machine interaction module, wherein the data acquisition module is connected with the shore power variable-voltage power supply and the ship power generation equipment and is used for acquiring the voltage, the frequency and the phase of the shore power variable-voltage power supply and the ship;
the control module is respectively connected with the shore power variable-voltage variable-frequency power supply and the ship power generation equipment, and the control module is provided with a speed regulation and excitation control module for the ship power generation equipment and a control algorithm module for the shore power variable-voltage variable-frequency power supply inverter.
2. The ship shore power bidirectional grid-connected control system of claim 1, wherein: the shore power frequency and voltage conversion power supply is provided with a voltage adjusting device and a frequency adjusting device.
3. The ship shore power bidirectional grid-connected control system of claim 1, wherein: the ship power generation equipment is a diesel generator set.
4. The ship shore power bidirectional grid-connected control system of claim 1, wherein: the marine power plant is a generator with reverse power protection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010500801.XA CN111585309A (en) | 2020-06-04 | 2020-06-04 | Ship shore power bidirectional grid-connected control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010500801.XA CN111585309A (en) | 2020-06-04 | 2020-06-04 | Ship shore power bidirectional grid-connected control system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260269A (en) * | 2020-09-29 | 2021-01-22 | 许继电源有限公司 | Shore power supply system of inland river port and control method |
| CN112909996A (en) * | 2021-01-25 | 2021-06-04 | 天津捷强动力装备股份有限公司 | Parallel operation control method and controller for gasoline generator set |
| CN112968443A (en) * | 2021-04-09 | 2021-06-15 | 东方日立(成都)电控设备有限公司 | Reverse power suppression method and system for shore power supply device |
| CN114336948A (en) * | 2022-01-04 | 2022-04-12 | 中国船舶重工集团公司第七0四研究所 | Uninterrupted power supply distribution system for new energy ship and control method thereof |
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| CN106026181A (en) * | 2016-07-25 | 2016-10-12 | 上海艾临科智能科技有限公司 | Ship shore power system |
| CN207967959U (en) * | 2018-01-02 | 2018-10-12 | 希望森兰科技股份有限公司 | The two-way grid-connected system of frequency conversion shore electric power |
| CN109038682A (en) * | 2018-10-17 | 2018-12-18 | 江苏科技大学 | A kind of device inhibiting shipping shore power system inverse probability |
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| CN106026181A (en) * | 2016-07-25 | 2016-10-12 | 上海艾临科智能科技有限公司 | Ship shore power system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112260269A (en) * | 2020-09-29 | 2021-01-22 | 许继电源有限公司 | Shore power supply system of inland river port and control method |
| CN112909996A (en) * | 2021-01-25 | 2021-06-04 | 天津捷强动力装备股份有限公司 | Parallel operation control method and controller for gasoline generator set |
| CN112968443A (en) * | 2021-04-09 | 2021-06-15 | 东方日立(成都)电控设备有限公司 | Reverse power suppression method and system for shore power supply device |
| CN114336948A (en) * | 2022-01-04 | 2022-04-12 | 中国船舶重工集团公司第七0四研究所 | Uninterrupted power supply distribution system for new energy ship and control method thereof |
| CN114336948B (en) * | 2022-01-04 | 2024-07-26 | 中国船舶重工集团公司第七0四研究所 | Uninterrupted power distribution system for new energy ship and control method thereof |
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Application publication date: 20200825 |