CN112350372B - Flexible networking method of modular power supplies suitable for intelligent energy station of port - Google Patents

Flexible networking method of modular power supplies suitable for intelligent energy station of port Download PDF

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CN112350372B
CN112350372B CN202011185267.4A CN202011185267A CN112350372B CN 112350372 B CN112350372 B CN 112350372B CN 202011185267 A CN202011185267 A CN 202011185267A CN 112350372 B CN112350372 B CN 112350372B
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state
converter
less
num
gamma
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CN112350372A (en
Inventor
许冠军
郑梦阳
何胜利
邓任任
刘俊
温殿国
王馨
迟福海
田大伟
吾喻明
王磐
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State Grid Smart Energy Traffic Technology Innovation Center Suzhou Co ltd
NARI Group Corp
Nari Technology Co Ltd
Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
State Grid Electric Power Research Institute
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State Grid Smart Energy Traffic Technology Innovation Center Suzhou Co ltd
NARI Group Corp
Nari Technology Co Ltd
Huzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
State Grid Electric Power Research Institute
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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
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a flexible networking method of a modular power supply suitable for a port intelligent energy station, which is used for calculating the parallel connection number gamma of converters meeting the power requirement of port charging load num (ii) a Judging gamma num If n is less than or equal to gamma num If the current transformer multi-machine parallel system is less than n +1, judging that the current transformer multi-machine parallel system is in a state n, and starting n current transformers to be connected in parallel; if the running state is the state n and the started converter does not have a fault, returning to the step 1 to continue executing; if the running state is the state n and the number of faults of the started converter is 1, cutting off the fault converter, sending a signal to start the standby converter, and then returning to the step 1 to continue execution; and if the running state is the state n and the number of faults of the started converter is more than 1, reducing the load or stopping the system. The invention improves the compatibility and expandability of the modular power supply of the intelligent energy station of the port, can quickly remove a fault module and put in a standby module, and ensures the reliable operation of the system.

Description

Flexible networking method of modular power supplies suitable for intelligent energy station of port
Technical Field
The invention relates to a flexible networking method of a modular power supply suitable for a port intelligent energy station, and belongs to the technical field of direct-current micro-grids.
Background
In recent years, legal laws, regulations and policy documents such as air pollution prevention law, water pollution prevention law, air pollution prevention action plan, water pollution prevention action plan and the like, which are issued in succession by the state, all put forward clear requirements on the construction of port shore power and the use of shore power by ships, so that the construction of intelligent energy stations for port ships is also widely concerned by the engineering and academic circles, and more port shore power projects are put into operation.
Nowadays, with the continuous development of the related technology of the electric ship, the port fuel oil ship is expected to be gradually replaced by the electric ship, and the electric quantity of a power battery used by the electric ship reaches the megawatt level. Due to the particularity of ship operation, the shore charging time is short, so that the problem of high-power charging of the power battery of the electric ship is solved. The existing shore power supply for the port has the problems of single power supply mode, utilization rate and the like, does not have a direct-current charging system, does not have a flexible networking function, and cannot meet the charging requirement of a power battery for a high-power ship.
Therefore, how to meet the power requirements of wide-range and dynamic loads of a port area, improve the compatibility and expandability of the port intelligent energy station modular power supply, and ensure safe and reliable operation of port shore power is a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a flexible networking method of a modular power supply suitable for a port intelligent energy station.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a flexible networking method of a modular power supply suitable for a port intelligent energy station comprises the following steps:
step 1: real-time acquisition of DC bus load power P dc Generating power P of photovoltaic power generation system pv And the charging and discharging power P of the energy storage system e ；
And 2, step: according to the load power P of the direct current bus dc Generating power P of photovoltaic power generation system pv And the charging and discharging power P of the energy storage system e Calculating the parallel connection number gamma of the converters meeting the power requirement of the port charging load num ；
And 3, step 3: judging gamma num Interval of (2), if γ num If the current transformer multi-machine parallel system is less than 1, judging that the current transformer multi-machine parallel system is in a state 1, and starting a current transformer; if 1 is less than or equal to gamma num If the current transformer multi-machine parallel system is less than 2, judging that the current transformer multi-machine parallel system is in a state 2, and starting two current transformers to be connected in parallel in a multi-machine mode; if 2 is less than or equal to gamma num If the number of the converters is less than 3, the multi-machine parallel system of the converters is judged to be in a state 3, and the three converters are started to be connected in parallel in a multi-machine mode(ii) a And so on if n is less than or equal to gamma num If the current transformer multi-machine parallel system is less than n +1, judging that the current transformer multi-machine parallel system is in a state n, wherein n is an integer larger than 3, and starting n current transformers to be connected in parallel;
and 4, step 4: sampling a fault signal of a started converter according to the running state of a multi-unit parallel system of the converter in the port intelligent energy station;
and 5: if the running state is the state 1 and the started converter does not break down, returning to the step 1 to continue to execute; if the running state is the state 1 and the started converter fails, the failed converter is cut off, a signal is sent to start the standby converter, and then the step 1 is returned to continue to be executed;
and 6: if the running state is the state 2 and the started converter does not have a fault, returning to the step 1 to continue executing; if the running state is the state 2 and the number of faults of the started converter is 1, the fault converter is cut off, a signal is sent to start the standby converter, and then the step 1 is returned to continue to be executed; if the running state is state 2 and the number of faults of the started converter is 2, load reduction running or system stopping running are carried out;
and 7: if the running state is the state 3 and the started converter does not have a fault, returning to the step 1 to continue executing; if the running state is the state 3 and the number of faults of the started converter is 1, the fault converter is cut off, a signal is sent to start the standby converter, and then the step 1 is returned to continue to be executed; if the running state is the state 3 and the number of faults of the started converter is more than 1, load reduction running or system stopping running are carried out;
and step 8: if the running state is the state n and the started converter does not break down, and n is an integer greater than 3, returning to the step 1 to continue executing; if the running state is the state n and the number of faults of the started converter is 1, cutting off the fault converter, sending a signal to start the standby converter, and then returning to the step 1 to continue execution; and if the running state is the state n and the number of faults of the started converter is more than 1, performing load shedding operation or stopping the system.
As a preferable scheme, the method for judging the state in the step 3 specifically comprises the following steps:
step a: if the intelligent energy station of the port is not started and the multi-machine parallel system of the default converter is in a state 0, the intelligent energy station of the port is started for the first time according to gamma num The number of the converters to be put into operation is judged, the converter state change process is that the state 0 is converted into the state 1, the state 0 is converted into the state 2, the state 0 is converted into the state 3, and the like, the state 0 is converted into the state n, the n is an integer larger than 3, and only the required number of converters are required to be put into each state conversion;
step b: if the intelligent energy station of the port operates, gamma is calculated according to the change of the load power demand of the direct current bus num Judging by combining the running state of the multi-machine parallel system of the converter at the previous moment;
step c: if gamma is to be num If the running state of the system is less than 1, the running state of the system is unchanged if the running state of the system at the last moment is 1, and the action of a converter is not needed; if gamma is num If the current is less than 1, the operation state at the last moment is a state 2, the second converter is cut off, and the system is in the state 1 at present; if gamma is to be num If the current time is less than 1, the operation state at the last moment is a state 3, the second converter and the third converter are cut off, and the system is in a state 1 at present; by analogy, if gamma num If the operation state at the last moment is a state n, cutting off a second converter, a third converter, a 8230converter and an nth converter, wherein the system is in a state 1 at present;
step d: if 1 is less than or equal to gamma num If the current state is less than 2, the operation state at the last moment is a state 1, starting a second converter, and enabling the system to be in a state 2 at present; if 1 is less than or equal to gamma num If the running state of the system is less than 2, the running state of the system at the last moment is in a state 2, and the system state is kept unchanged; if 1 is less than or equal to gamma num If the current time is less than 2, if the last operating state is a state 3, the third converter is cut off, and the system is in a state 2 at present; analogizing in turn, if gamma is more than or equal to 1 num If the operation state at the last moment is the state n, cutting off a third converter, 8230, an nth converter and a system which is currently in the state 2;
step e: if 2 is less than or equal to gamma num If the current running state is less than 3, the second converter and the third converter are started when the last running state is the state 1, and the system is currently in the state 3; if 2 is less than or equal to gamma num If the last operating state is state 2, starting the thirdA converter, the system is currently in state 3; if 2 is less than or equal to gamma num If the running state of the system is less than 3, the running state of the system at the last moment is in a state 3, and the system state is kept unchanged; and so on if 2 is less than or equal to gamma num If the operation state is the state n at the last moment, cutting off a fourth converter, a 8230converter, an nth converter and a system which are in the state 3 at present;
step f: analogizing in turn, if n is less than or equal to gamma num If the current state is less than n +1, starting a second converter, a third converter, a fourth converter and a fourth converter when the previous running state is a state 1, wherein the second converter, the third converter, the fourth converter and the fourth converter are started; if n is less than or equal to gamma num If the current state is less than n +1, if the operation state at the last moment is a state 2, starting a third converter, a fourth converter, a 8230converter and an nth converter, wherein the system is currently in a state n; if n is less than or equal to gamma num If the current state is less than n +1, the operation state at the last moment is a state 3, then a fourth converter, a fifth converter, a 8230, a system is currently in a state n; analogizing in turn, if n is less than or equal to gamma num If the running state is less than n +1, the last moment is a state n, and the system state is kept unchanged; if n is less than or equal to gamma num And (4) less than n +1, if the operation state at the last moment is a state n +1+ k, and k is an integer greater than 1, the n +2, 8230, the n + k converter is cut off, and the system is currently in a state n.
As a preferred scheme, the intelligent port energy station comprises a converter multi-machine parallel system, a photovoltaic power generation system, an energy storage system and a port charging load, wherein the photovoltaic power generation system, the energy storage system and the port charging load are respectively connected with a direct-current side direct-current bus of the converter multi-machine parallel system.
Preferably, γ is num The calculation formula is as follows:
Figure BDA0002749746960000031
wherein, P r Refers to the rated power of the converter.
Preferably, the port charging load is an electric ship.
Preferably, the converter control method comprises the following steps:
step a: when the converter receives a starting signal, a unified voltage outer ring controller in the converter multi-machine parallel system calculates a given value of a current electric ring;
step b: and transmitting the given value of the current electric ring to each current inner ring of the converter for coordinate transformation and proportional resonance regulation, synthesizing the given value of the current electric ring with the voltage of the power grid into a voltage vector, and inputting the voltage vector to the SVPWM modulation module for controlling the converter.
Has the beneficial effects that: the flexible networking method of the modular power supply suitable for the intelligent port energy station can meet the requirements of wide-range and dynamic load power of port areas, realizes the self-adaptive butt joint of the charging power supply and the ship charging power requirement, improves the compatibility and expandability of the modular power supply of the intelligent port energy station, and can quickly cut off a fault module and put in a standby module aiming at a module with a fault in operation, thereby ensuring the reliable operation of a system.
Drawings
Fig. 1 is a schematic structural diagram of a port intelligent energy station.
Fig. 2 is a flowchart of a flexible networking method for a modular power supply adapted to a port intelligent energy station.
FIG. 3 is a flow chart of state switching when the intelligent energy station system of the harbor is first started.
FIG. 4 is a flow chart of state switching when the intelligent energy station system of the port starts operation.
Fig. 5 is a block diagram of a real-time current sharing control strategy based on a PR controller.
FIG. 6 is a simulation diagram of the system operation when the load power of the intelligent energy station of the port changes.
Fig. 7 is a simulation diagram of the operation of the system when a converter of the intelligent energy station of the port fails.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 1, a flexible networking method of a modular power supply adapted to a smart energy station of a port, where the smart energy station of the port includes a converter multi-machine parallel system, a photovoltaic power generation system, an energy storage system and a port charging load, which are respectively connected to a dc bus on a dc side of the converter multi-machine parallel system, and as shown in fig. 2, the method specifically includes the following steps:
step 1: real-time acquisition of DC bus load power P dc Generating power P of photovoltaic power generation system pv And the charging and discharging power P of the energy storage system e ；
And 2, step: according to the load power P of the direct current bus dc Generating power P of photovoltaic power generation system pv And the charging and discharging power P of the energy storage system e Calculating the parallel connection number gamma of the converters meeting the power requirement of the port charging load num ；
Wherein gamma is num Is calculated by the formula
Figure BDA0002749746960000051
Wherein, P r The energy storage system plays a role in stabilizing the fluctuation of the generated power of the photovoltaic system and maintains the sum of the generated power of the photovoltaic system and the charging and discharging power of the energy storage system to be stable;
and step 3: only three converters are selected to be connected in parallel to judge gamma num Interval of (d), if γ num If the number of the converter multi-machine parallel system is less than 1, judging that the converter multi-machine parallel system is in a state 1, and starting one converter; if 1 is less than or equal to gamma num If the current transformer multi-machine parallel system is less than 2, judging that the current transformer multi-machine parallel system is in a state 2, and starting two current transformers to be connected in parallel in a multi-machine mode; if 2 is less than or equal to gamma num If the current transformer multi-machine parallel system is less than 3, judging that the current transformer multi-machine parallel system is in a state 3, and starting three current transformers to be connected in parallel in a multi-machine mode; when gamma is equal to num >At time 3, the judgment is made in the same manner.
The step 3 comprises the following steps:
step a: as shown in fig. 3, if the intelligent energy station of the port is not started and the multi-machine parallel system of the default converter is in the state 0, the intelligent energy station of the port is started for the first time according to γ num The number of the converters to be put into operation is judged, and the converter can be specifically classified into a state 0 which is converted into a state 1, a state 0 which is converted into a state 2, a state 0 which is converted into a state 3, and a state 0 which is converted into a state N, wherein only the required number of converters are required to be put into each state conversion;
step b: as shown in the figure 4 of the drawings,selecting a case with three converters connected in parallel for analysis, and calculating gamma according to the load power demand change of the direct current bus after the port intelligent energy station operates num Judging by combining the running state of the multi-machine parallel system of the converter at the previous moment;
step c: as shown in FIG. 4, if γ num If the running state of the system is less than 1, the running state of the system is unchanged if the running state of the system at the last moment is 1, and the action of a converter is not needed; if gamma is num If the current is less than 1, the operation state at the last moment is a state 2, the second converter is cut off, and the system is in the state 1 at present; if gamma is num If the current state is less than 1, and the operation state at the last moment is a state 3, cutting off the second converter and the third converter, wherein the system is currently in the state 1;
step d: as shown in FIG. 4, if 1 ≦ γ num If the current state is less than 2, the operation state at the last moment is a state 1, starting a second converter, and enabling the system to be in a state 2 at present; if 1 is less than or equal to gamma num If the running state of the system is less than 2, the running state of the system at the last moment is in a state 2, and the system state is kept unchanged; if 1 is less than or equal to gamma num If the current state is less than 2, if the operation state at the last moment is a state 3, the third converter is cut off, and the system is currently in a state 2;
step e: as shown in FIG. 4, if 2 ≦ γ num If the current running state is less than 3, the second converter and the third converter are started if the last running state is the state 1, and the system is in the state 3 currently; if 2 is less than or equal to gamma num If the current state is less than 3, if the operation state at the last moment is the state 2, starting a third converter, and enabling the system to be in the state 3 currently; if 2 is less than or equal to gamma num If the running state is less than 3, the last running state is a state 3, and the system state is kept unchanged.
Multiple converters are analyzed in the same manner.
And 4, step 4: sampling a fault signal of a started converter according to the running state of a multi-unit parallel system of the converter in the port intelligent energy station;
and 5: if the running state is the state 1 and the started converter does not break down, returning to the step 1 to continue to execute; if the running state is the state 1 and the started converter fails, the failed converter is cut off, a signal is sent to start the standby converter, and then the step 1 is returned to continue to be executed;
step 6: if the running state is the state 2 and the started converter does not have a fault, returning to the step 1 to continue executing; if the running state is state 2 and the number of faults of the started converter is 1, cutting off the fault converter, sending a signal to start the standby converter, and then returning to the step 1 to continue execution; if the running state is the state 2 and the number of faults of the started converter is 2, reducing the load to run or stopping the system to run;
and 7: if the running state is the state 3 and the started converter does not break down, returning to the step 1 to continue to execute; if the running state is the state 3 and the number of faults of the started converter is 1, the fault converter is cut off, a signal is sent to start the standby converter, and then the step 1 is returned to continue to be executed; and if the running state is in a state 3 and the number of faults of the started converter is more than 1, performing load reduction running or stopping running of the system.
And 8: if the operating state is state N, the analysis is performed in the same manner as in step 7.
The embodiment is as follows: analysis of simulation results
The port intelligent energy station modularized power supply flexible networking is realized by Fortran language in electromagnetic transient simulation software PSCAD/EMTDC, three converters are selected to be connected in parallel to operate, and a real-time current sharing control strategy based on a PR controller shown in figure 5 is adopted. Fig. 6 is a simulation diagram of the port intelligent energy station under the condition of load power demand change, which includes three sub-diagrams, and fig. 6 (a) -6 (c) are respectively the load power, the dc side voltage and the converter power. As shown in the figure 6, the power demand of the direct current bus load is continuously increased in 0.5s and 0.8s, the converters are started in order according to a flexible networking algorithm, the stable state can be quickly achieved, the power sharing precision is good, meanwhile, the voltage fluctuation of the direct current side is small, and flexible networking of the port intelligent energy station modular power supply can be realized. Fig. 7 is a simulation diagram of a converter in a port intelligent energy station under a fault condition, which includes three sub-diagrams, where fig. 7 (a) -7 (c) are respectively a load power, a dc side voltage and a converter power. As shown in the figure 7, the converters 1 and 2 are powered before 0.5s, the converter 2 in 0.5s breaks down, the fault module is quickly cut off and the standby converter is started according to a flexible networking algorithm aiming at the module which breaks down in operation, the stable state can be quickly achieved, the power sharing precision is good, meanwhile, the voltage fluctuation on the direct current side is small, and the modularization power supply redundancy of the intelligent port energy station can be realized.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (5)

1. A flexible networking method of a modular power supply suitable for a port intelligent energy station is characterized by comprising the following steps: the method comprises the following steps:
step 1: real-time acquisition of DC bus load power P dc Generating power P of photovoltaic power generation system pv And the charging and discharging power P of the energy storage system e ；
Step 2: according to the load power P of the direct current bus dc Generating power P of photovoltaic power generation system pv And the charging and discharging power P of the energy storage system e Calculating the parallel connection number gamma of the converters meeting the power requirement of the port charging load num ；
And step 3: judgment of gamma num Interval of (2), if γ num If the number of the converter multi-machine parallel system is less than 1, judging that the converter multi-machine parallel system is in a state 1, and starting one converter; if 1 is less than or equal to gamma num If the number is less than 2, judging that the converter multi-machine parallel system is in a state 2, and starting the two converters to be connected in parallel in a multi-machine mode; if 2 is less than or equal to gamma num If the number is less than 3, judging that the converter multi-machine parallel system is in a state 3, and starting three converters to be connected in parallel in a multi-machine mode; and so on if n is less than or equal to gamma num If the current transformer multi-machine parallel system is less than n +1, judging that the current transformer multi-machine parallel system is in a state n, wherein n is an integer larger than 3, and starting n current transformers to be connected in parallel;
and 4, step 4: sampling a fault signal of a started converter according to the running state of a multi-unit parallel system of the converter in the port intelligent energy station;
and 5: if the running state is the state 1 and the started converter does not break down, returning to the step 1 to continue to execute; if the running state is the state 1 and the started converter fails, cutting off the failed converter, sending a signal to start the standby converter, and then returning to the step 1 to continue execution;
step 6: if the running state is the state 2 and the started converter does not have a fault, returning to the step 1 to continue executing; if the running state is state 2 and the number of faults of the started converter is 1, cutting off the fault converter, sending a signal to start the standby converter, and then returning to the step 1 to continue execution; if the running state is the state 2 and the number of faults of the started converter is 2, reducing the load to run or stopping the system to run;
and 7: if the running state is the state 3 and the started converter does not break down, returning to the step 1 to continue to execute; if the running state is the state 3 and the number of faults of the started converter is 1, the fault converter is cut off, a signal is sent to start the standby converter, and then the step 1 is returned to continue to be executed; if the running state is the state 3 and the number of faults of the started converter is more than 1, reducing the load to run or stopping the system to run;
and 8: if the running state is the state n and the started converter does not break down, and n is an integer greater than 3, returning to the step 1 to continue executing; if the running state is the state n and the number of faults of the started converter is 1, the fault converter is cut off, a signal is sent to start the standby converter, and then the step 1 is returned to continue to be executed; if the running state is the state n and the number of faults of the started converter is more than 1, load reduction running or system stopping running are carried out;
the gamma is num The calculation formula is as follows:
Figure FDA0003761903980000021
wherein, P r Refers to the rated power of the converter.
2. The flexible networking method of the modular power supplies suitable for the intelligent energy station of the port as claimed in claim 1, wherein: the method for judging the state in the step 3 specifically comprises the following steps:
step a: if the port intelligent energy station is not started and the default converter multi-machine parallel system is in a state 0, when the port intelligent energy station is started for the first time, the port intelligent energy station is started according to gamma num The number of the converters to be put into operation is judged, the converter state change process is that the state 0 is converted into the state 1, the state 0 is converted into the state 2, the state 0 is converted into the state 3, and the like, the state 0 is converted into the state n, the n is an integer larger than 3, and only the required number of converters are required to be put into each state conversion;
step b: if the intelligent energy station of the port operates, gamma is calculated according to the change of the load power demand of the direct current bus num Judging by combining the running state of the multi-machine parallel system of the current transformer at the previous moment;
step c: if gamma is num If the running state of the system is less than 1, the running state of the system is unchanged if the running state of the system at the last moment is 1, and the action of a converter is not needed; if gamma is to be num If the current is less than 1, the operation state at the last moment is a state 2, the second converter is cut off, and the system is in a state 1 at present; if gamma is to be num If the current state is less than 1, and the operation state at the last moment is a state 3, cutting off the second converter and the third converter, wherein the system is currently in the state 1; by analogy, if gamma num If the operation state at the last moment is the state n, cutting off a second converter, a third converter, a 8230converter, an nth converter and a system which are currently in the state 1;
step d: if 1 is less than or equal to gamma num If the current state is less than 2, if the operation state at the last moment is a state 1, starting a second converter, and enabling the system to be in a state 2 currently; if 1 is less than or equal to gamma num If the running state is less than 2, the last operating state is a state 2, and the system state is kept unchanged; if 1 is less than or equal to gamma num If the current state is less than 2, if the operation state at the last moment is a state 3, the third converter is cut off, and the system is currently in a state 2; analogizing in turn, if gamma is more than or equal to 1 num If the operation state at the last moment is a state n, cutting off a third converter, a converter 8230, and a converter n, wherein the system is in a state 2 at present;
step e: if 2 is less than or equal to gamma num If the current running state is less than 3, the second converter and the third converter are started if the last running state is the state 1, and the system is in the state 3 currently; if 2 is less than or equal to gamma num If the current state is less than 3, if the last operating state is state 2, the third converter is started, and the system is currently in state 3(ii) a If 2 is less than or equal to gamma num If the running state of the system is less than 3, the running state of the system at the last moment is in a state 3, and the system state is kept unchanged; analogizing in turn, if 2 is less than or equal to gamma num If the operation state is the state n at the last moment, cutting off a fourth converter, a 8230converter, an nth converter and a system which are in the state 3 at present;
step f: analogizing in turn, if n is less than or equal to gamma num If the current state is less than n +1, the operation state at the last moment is state 1, then the second converter, the third converter, the 8230, the nth converter and the system are in state n at present; if n is less than or equal to gamma num If the current state is less than n +1, if the operation state at the last moment is a state 2, starting a third converter, a fourth converter, a 8230converter and an nth converter, wherein the system is currently in a state n; if n is less than or equal to gamma num If the current state is less than n +1, the operation state at the last moment is a state 3, then a fourth converter, a fifth converter, a 8230, a system is currently in a state n; analogizing in turn, if n is less than or equal to gamma num If the running state of the system is less than n +1, the running state of the system at the last moment is a state n, and the system state is kept unchanged; if n is less than or equal to gamma num And (4) less than n +1, if the operation state at the last moment is a state n +1+ k, and k is an integer greater than 1, the n +2, 8230, the n + k converter is cut off, and the system is currently in a state n.
3. The flexible networking method of the modular power supplies suitable for the intelligent energy station of the port as claimed in claim 1, wherein: the intelligent port energy station comprises a converter multi-machine parallel system, a photovoltaic power generation system, an energy storage system and a port charging load, wherein the photovoltaic power generation system, the energy storage system and the port charging load are respectively connected with a direct-current side direct-current bus of the converter multi-machine parallel system.
4. The flexible networking method of the modular power supplies suitable for the intelligent energy station of the port as claimed in claim 3, wherein: the port charging load is an electric ship.
5. The flexible networking method of modular power supplies for intelligent energy station in port as claimed in claim 1, wherein: the converter control method comprises the following steps:
a, step a: when the converter receives a starting signal, a unified voltage outer ring controller in the converter multi-machine parallel system calculates a given value of a current electric ring;
step b: and transmitting the given value of the current electric ring to each current inner ring of the converter for coordinate transformation and proportional resonance regulation, synthesizing the given value of the current electric ring with the voltage of the power grid into a voltage vector, and inputting the voltage vector to the SVPWM modulation module for controlling the converter.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104993513A (en) * 2015-06-30 2015-10-21 华北电力科学研究院有限责任公司 Method and system for controlling battery energy storage power station of supporting black start of light-preserved power generation system
CN107785921A (en) * 2017-11-13 2018-03-09 国网天津市电力公司 Urban distribution network subregion interconnected operation dispatching method based on Technology of HVDC based Voltage Source Converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104993513A (en) * 2015-06-30 2015-10-21 华北电力科学研究院有限责任公司 Method and system for controlling battery energy storage power station of supporting black start of light-preserved power generation system
CN107785921A (en) * 2017-11-13 2018-03-09 国网天津市电力公司 Urban distribution network subregion interconnected operation dispatching method based on Technology of HVDC based Voltage Source Converter

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