CN111509828A - DC cabinet of wind-solar hybrid power generation system - Google Patents

DC cabinet of wind-solar hybrid power generation system Download PDF

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Publication number
CN111509828A
CN111509828A CN202010467839.1A CN202010467839A CN111509828A CN 111509828 A CN111509828 A CN 111509828A CN 202010467839 A CN202010467839 A CN 202010467839A CN 111509828 A CN111509828 A CN 111509828A
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CN
China
Prior art keywords
direct current
power generation
cabinet
wind
generation system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010467839.1A
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Chinese (zh)
Inventor
张原飞
王兵振
郭毅
薛彩霞
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National Ocean Technology Center
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National Ocean Technology Center
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Publication date
Application filed by National Ocean Technology Center filed Critical National Ocean Technology Center
Priority to CN202010467839.1A priority Critical patent/CN111509828A/en
Publication of CN111509828A publication Critical patent/CN111509828A/en
Pending legal-status Critical Current

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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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a wind-solar hybrid power generation system direct current cabinet, which comprises a cabinet body, wherein a control circuit board is arranged in the cabinet body, the control circuit board is provided with a fan control interface, a photovoltaic control interface, a storage battery pack interface, an inverter interface and a measurement and control unit, the measurement and control unit is connected to a main bus bar and comprises a direct current measurement module, an I/O module, a computer, a current measurement unit and a voltage measurement unit, the current measurement unit is arranged at the input end of each unit, and the voltage measurement unit is arranged at the output end of the direct current bus bar. The wind-solar complementary direct current cabinet can provide an integrated platform for renewable energy power generation systems such as fans, photovoltaic systems and the like, fully meets the matching use of power generation equipment in different forms and different levels, realizes unified protection and centralized monitoring, has high integration level, good reliability and complete protection function, and can be widely applied to the field of renewable energy power generation.

Description

DC cabinet of wind-solar hybrid power generation system
Technical Field
The invention belongs to the technical field of wind-solar hybrid power generation, and particularly relates to a direct current cabinet of a wind-solar hybrid power generation system.
Background
At present, the utilization of wind energy and solar energy becomes the most environment-friendly and economic renewable energy power generation mode. The wind-solar hybrid power generation mode has better resource complementarity, power supply safety and stability than a single energy power generation mode, and is widely applied. With the gradual maturity of photovoltaic power generation and wind power generation technologies, a technical foundation is laid for the research, development and optimization of a wind-solar hybrid power generation system.
The photovoltaic power generation device and the wind power generation device of the same manufacturer directly connect the direct current output of photovoltaic power generation and wind power generation on a storage battery pack through a wind-solar complementary controller, an unloading load is usually connected to the alternating current side of a fan, and a direct current bus is not protected. In addition, the wind-solar hybrid power generation system adopts products of different manufacturers, the products of different manufacturers cannot be compatible with each other, so that an island system is formed, photovoltaic power generation devices and wind power generation devices of different manufacturers are integrated, the problem of non-uniform technical interfaces is faced, and independent operation control strategies influence the safety and the service life of the storage battery. The monitoring modules of all the units are dispersed and independent, cannot carry out centralized monitoring and diagnosis, and cannot form a unified and complete monitoring system. The majority of controllers only have one storage battery interface, and the capacity expansion requirement cannot be met. Therefore, a set of unified wind-solar hybrid direct current cabinet is urgently needed, power generation equipment of different manufacturers, different types and different models can be managed, and the complete and unified real-time monitoring, control and protection of a wind-solar hybrid power generation system are realized.
Disclosure of Invention
In view of the above, the present invention provides a dc cabinet of a wind-solar hybrid power generation system to solve the above mentioned problems in the background art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a wind-solar complementary power generation system direct current cabinet comprises a cabinet body, wherein a control circuit board is arranged in the cabinet body, the control circuit board is provided with a fan control interface, a photovoltaic control interface, a storage battery pack interface and an inverter interface, the fan control interface, the photovoltaic control interface, the storage battery pack interface and the inverter interface are all connected on a main bus bar to form different branch circuits,
the direct current measurement module is used for measuring current, voltage and power in a direct current system and displaying data and an operation state through the computer;
the direct current bus voltage measuring device is characterized by further comprising a current measuring unit and a voltage measuring unit, wherein the current measuring unit is arranged at the input end of each unit, and the voltage measuring unit is arranged at the output end of the direct current bus.
Furthermore, the direct current cabinet comprises a plurality of input, energy storage and inversion interfaces, and each interface module is controlled by the molded case direct current circuit breaker with the communication function and the on/off state of the system, so that the direct current cabinet has two modes of local control and remote control.
Furthermore, the direct current measurement module adopts a multifunctional direct current meter, so that centralized measurement is realized, and the electrical parameters of each unit can be synchronously monitored.
Furthermore, the current measuring unit adopts a Hall current sensor, and the voltage measuring unit adopts a Hall voltage sensor.
Furthermore, an unloading load is arranged on the direct current bus, the capacity of the unloading load is configured according to 1.2 times of the installed capacity of the system, the unloading load can be divided into multiple stages, and the unloading load can be switched step by a direct current contactor.
Furthermore, a plurality of input units of the direct current cabinet are connected in parallel and converged on a direct current bus, each output is provided with an anti-reverse charging diode, and a half-bridge circuit of the storage battery group is built through the anti-reverse charging diodes.
Furthermore, a fuse is arranged on a loop formed by the voltage measuring unit.
Furthermore, the direct current measurement module is provided with an RS-485 communication interface and adopts a Modbus-RTU protocol.
Further, the main busbar is tinned, and a heat-shrinkable sleeve is arranged at the spare part.
Compared with the prior art, the wind-solar hybrid power generation system direct current cabinet has the following advantages:
(1) the wind-solar complementary direct current cabinet can converge a plurality of paths of photovoltaic power generation equipment and wind power generation equipment to a direct current bus, can be connected with a plurality of groups of storage batteries, is additionally provided with the protection function of the direct current bus, acquires electrical data of each branch, synchronously monitors electrical parameters of each unit, grasps the operation condition of the whole system, makes different operation strategies, remotely controls circuit breakers of each branch through a software platform, and can intensively control the working state of each power generation unit;
(2) the wind-solar complementary direct current cabinet can provide an integrated platform for renewable energy power generation systems such as fans, photovoltaic systems and the like, fully meets the matching use of power generation equipment in different forms and different levels, realizes unified protection and centralized monitoring, has high integration level, good reliability and complete protection function, and can be widely applied to the field of renewable energy power generation.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
fig. 1 is a schematic diagram of a dc cabinet of a wind-solar hybrid power generation system according to an embodiment of the invention.
Description of reference numerals:
1-a first fan controller interface; 2-a second fan controller interface; 3-a first photovoltaic controller interface; 4-a second photovoltaic controller interface; 5-a first battery pack interface; 6-a second battery pack interface; 7-a first inverter interface; 8-a second inverter interface; 9-unloading load; 10-a direct current measurement module; 11-I/O module; 12-an anti-reverse diode; 13-a hall current sensor; 14-a circuit breaker; 15-a surge protector; 16-a contactor; 17-hall voltage sensor; 18-voltage sensor interface; 19-a current sensor interface; 20-circuit breaker control signal; 21-contactor control signal; 22-RS485 interface; 23-power input interface.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
As shown in fig. 1, the dc cabinet includes 2 fan controller input interfaces, 2 photovoltaic controller interfaces, 2 storage battery pack interfaces, 2 inverter interfaces, a measurement and control system, a current measurement unit, and a voltage measurement unit;
the devices are connected to the main busbar, the wiring of each device forms a branch, and the voltage of the busbar is determined by the terminal voltage of the storage battery pack. Determining the size of the busbar according to the maximum current of the circuit, performing tinning treatment on the joint of the busbar, heating the spare part to shrink the sleeve for protection, and screwing down the screw at the joint to prevent the copper bar from being melted when the current is large;
in order to protect each device, each device controls the on/off state of the system through a molded case direct current breaker, and the molded case direct current breaker 14 has the functions of quick closing and quick breaking, overload long-delay protection, short circuit instantaneous protection and the like. In order to simultaneously meet the requirements of manual operation and electric operation, an electric operation mechanism is selected to be matched with a direct current circuit breaker, so that remote control and automatic control can be realized. The breaker on the installation site can carry out remote opening and closing operation through a network or a communication channel;
in the embodiment, the voltage measurement circuit needs a fuse for protection, so that voltage drop caused by short circuit of the instrument is prevented, and voltage loss and misoperation of relay protection are prevented. The surge protector 15 and the fuse are used for preventing overlarge current impact from being absorbed by the protector, so that the functions of fusing a fuse and protecting a system circuit are achieved. If the surge protector breaks down, a long-time connection state can occur, a system short circuit is caused, a fuse at the front end is needed to cut off a grounding loop in time, and the normal work of the loop is guaranteed.
In this embodiment, the surge protector 15 can provide safety protection for each device on the bus in the dc cabinet. When the electric loop suddenly generates peak current or voltage due to external interference, the surge protector can conduct and shunt in a very short time, so that damage of surge to other equipment in the loop is avoided.
In this embodiment, the outputs of the dc cabinets are connected in parallel to the dc bus, and each output is provided with an anti-reverse diode 12, so as to prevent other unit control cabinets or battery packs from charging the output end of the unit control cabinet, and prevent the voltage of the storage battery from charging the capacitor at the output end of the unit control cabinet when the unit control cabinet is started.
Meanwhile, a half-bridge circuit for grouping the storage batteries is built through the anti-reverse diode 12, and the mutual charging phenomenon caused by unbalanced voltage among different storage battery packs is avoided.
In this embodiment, the hall current sensor 13 and the hall voltage sensor 17 are selected as current and voltage measuring tools, the hall current sensor 13 is disposed at the input end of each unit, the hall voltage sensor 17 is disposed at the output end of the dc bus, and the sensors transmit signals to the dc module for calculation and processing. The electrical parameters of each node are collected in a centralized manner, so that synchronous data can be formed, the operation condition of the power generation system can be monitored more comprehensively, and a reasonable operation control strategy can be made.
In this embodiment, the measurement and control system is composed of the dc measurement module 10, the I/O module 11, and the computer, and the intelligent multi-path dc module is selected to measure the current, voltage, and power in the dc system, and the module can display data and operation state through the computer. The module can be provided with an RS-485 communication interface, adopts a Modbus-RTU protocol, and sets and controls the transformation ratio, the alarm and the communication according to different requirements. The module can measure a plurality of paths of direct current and direct current voltage. The I/O module receives the command of computer power generation, can control the on/off state of each breaker and contactor, and can also display the state information of each switch, protector and alarm device and make control.
In the wind-solar hybrid power generation system, due to the problem of runaway of a fan, the wind power generation equipment cannot be switched at will, and the photovoltaic power generation equipment can be switched at any time, so once the direct-current bus voltage is too high, the photovoltaic power generation unit is firstly switched off, and if the direct-current bus voltage is still not reduced and the fan cannot be braked, the unloading load is gradually input. In the embodiment, the direct current bus is connected with the unloading load, and when the voltage of the storage battery exceeds an overvoltage protection value, the unloading load 9 is connected to provide a discharge path for generating power. The capacity of the unloading load 9 is configured according to 1.2 times of the installed capacity of the system, can be divided into multiple stages, and can be switched step by a direct current contactor.
The direct current cabinet created by the invention not only can be used for a wind-solar complementary power generation system, but also can be connected with a tidal current energy and wave energy power generation device to form a multi-energy complementary power supply form, and the direct current cabinet only allows direct current access and needs a uniform access form and technical specification.
The direct current cabinet is mainly used for connecting a fan controller and a photovoltaic controller, providing a direct current input interface, converging direct current power supplies of a fan and photovoltaic input, storing the converged direct current power supplies into a storage battery, and connecting the storage battery to an inverter. The direct current cabinet adopts high performance components and parts, and intelligent programming makes the continuous stable operation of system, can realize that fan and photovoltaic output's electric energy converges, dilatation, storage, protection and monitoring's function.
The invention realizes that the fan and the photovoltaic multi-path unstable direct current are input and flow on a direct current bus in parallel, and the stable direct current output is provided for the inverter through the buffer voltage stabilization of the storage battery.
The invention designs the input interfaces of the multi-channel fan controller and the photovoltaic controller, can expand the installed capacity, and designs the multi-channel storage battery interface, thereby increasing the energy storage capacity. And selecting different types of electric elements according to different design capacities.
The DC bus is provided with a multi-stage unloading load, and the multi-stage unloading load is connected according to the bus voltage, so that the DC bus voltage is ensured to be below the protection voltage of the storage battery.
The invention can detect the voltage, current, power, lightning protection state, switch state and other information of each branch, and has a standard RS485 digital communication interface connected with a monitoring system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.

Claims (9)

1. The utility model provides a complementary power generation system direct current cabinet of scene, includes the cabinet body, the internal control circuit board that is equipped with of cabinet, its characterized in that: the control circuit board is provided with a fan control interface, a photovoltaic control interface, a storage battery pack interface and an inverter interface which are all connected on the main bus bar to form different branch circuits,
the direct current measurement module is used for measuring current, voltage and power in a direct current system and displaying data and an operation state through the computer;
the direct current bus voltage measuring device is characterized by further comprising a current measuring unit and a voltage measuring unit, wherein the current measuring unit is arranged at the input end of each unit, and the voltage measuring unit is arranged at the output end of the direct current bus.
2. The direct current cabinet of the wind-solar hybrid power generation system according to claim 1, wherein: the direct current cabinet comprises a plurality of input, energy storage and inversion interfaces, and each interface module is controlled by a plastic shell direct current breaker with a communication function and is controlled by a system to be in a switching state and a switching state, so that the direct current cabinet has two modes of local control and remote control.
3. The direct current cabinet of the wind-solar hybrid power generation system according to claim 1, wherein: the direct current measurement module adopts a multifunctional direct current meter to realize centralized measurement and can synchronously monitor the electrical parameters of each unit.
4. The direct current cabinet of the wind-solar hybrid power generation system according to claim 1, wherein: the current measuring unit adopts a Hall current sensor, and the voltage measuring unit adopts a Hall voltage sensor.
5. The direct current cabinet of the wind-solar hybrid power generation system according to claim 1, wherein: the direct current bus is also provided with an unloading load, the capacity of the unloading load is configured according to 1.2 times of the installed capacity of the system, the unloading load can be divided into multiple stages, and the unloading load can be switched step by a direct current contactor.
6. The direct current cabinet of the wind-solar hybrid power generation system according to claim 1, wherein: a plurality of input units of the direct current cabinet are connected in parallel and converged on a direct current bus, each output is provided with an anti-reverse diode, and a half-bridge circuit of the storage battery group is built through the anti-reverse diodes.
7. The direct current cabinet of the wind-solar hybrid power generation system according to claim 1, wherein: and a fuse is also arranged on a loop formed by the voltage measuring unit.
8. The direct current cabinet of the wind-solar hybrid power generation system according to claim 1, wherein: the direct current measurement module is provided with an RS-485 communication interface and adopts a Modbus-RTU protocol.
9. The direct current cabinet of the wind-solar hybrid power generation system according to claim 1, wherein: the main bus bar is tinned, and a heat-shrinkable sleeve is arranged at the spare part.
CN202010467839.1A 2020-05-28 2020-05-28 DC cabinet of wind-solar hybrid power generation system Pending CN111509828A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010467839.1A CN111509828A (en) 2020-05-28 2020-05-28 DC cabinet of wind-solar hybrid power generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010467839.1A CN111509828A (en) 2020-05-28 2020-05-28 DC cabinet of wind-solar hybrid power generation system

Publications (1)

Publication Number Publication Date
CN111509828A true CN111509828A (en) 2020-08-07

Family

ID=71864496

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010467839.1A Pending CN111509828A (en) 2020-05-28 2020-05-28 DC cabinet of wind-solar hybrid power generation system

Country Status (1)

Country Link
CN (1) CN111509828A (en)

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