CN114512976A - Direct current distribution system - Google Patents
Direct current distribution system Download PDFInfo
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- CN114512976A CN114512976A CN202210074415.8A CN202210074415A CN114512976A CN 114512976 A CN114512976 A CN 114512976A CN 202210074415 A CN202210074415 A CN 202210074415A CN 114512976 A CN114512976 A CN 114512976A
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- voltage converter
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- current voltage
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/06—Two-wire systems
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
Abstract
The application discloses direct current distribution system belongs to the power supply technology field. The direct-current power distribution system comprises an alternating-current/direct-current voltage converter, a bidirectional direct-current voltage converter, an energy storage module, an energy storage manager and a controller. This direct current distribution system, when the residual capacity of energy storage module is more, can be by energy storage module to consumer output direct current to for consumer provides the electric energy. Therefore, the duration that the electric equipment is provided with electric energy by the alternating current bus can be reduced, various problems caused by the fact that the alternating current power distribution system provides the electric energy for the electric equipment are solved to a certain extent, and the quality of power supply electric energy is improved.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a direct current power distribution system.
Background
The power distribution system refers to a section of system which outputs electric energy in a power supply system from a transformer substation to a user side. In the related art, an ac power distribution system is generally used to supply electric power to a construction site where construction activities such as housing construction, equipment installation, and pipeline laying of industrial or civil projects are performed. An ac power distribution system is used to output ac power to electrical equipment performing construction activities.
However, when the ac power distribution system is used to provide power, if the rated power of the load is high, the load may be connected to the ac power distribution system, which may cause a problem of voltage flicker of the power supply system, and may result in a decrease in the quality of power in the power supply system.
Disclosure of Invention
The application provides a direct current distribution system, can solve the power supply system voltage flicker scheduling problem that the load inserts alternating current distribution system brought among the correlation technique to a certain extent. The technical scheme is as follows:
in a first aspect, a dc power distribution system is provided, including: the system comprises an alternating current-direct current voltage converter, a bidirectional direct current voltage converter, an energy storage module, an energy storage manager and a controller;
the input end of the AC/DC voltage converter is connected with an AC bus, and the output end of the AC/DC voltage converter is connected with the first end of the bidirectional DC voltage converter;
the first end of the bidirectional direct-current voltage converter is also used for being connected with electric equipment, and the second end of the bidirectional direct-current voltage converter is connected with the energy storage module;
the detection end of the energy storage manager is connected with the energy storage module to detect the residual electric quantity of the energy storage module, and the output end of the energy storage manager is connected with the controller to output the residual electric quantity to the controller;
the controller is also connected with the control end of the AC-DC voltage converter and the control end of the bidirectional DC voltage converter, and the controller is used for: if the residual electric quantity is within a first electric quantity range, controlling the alternating current-direct current voltage converter and the bidirectional direct current voltage converter to work so that the alternating current-direct current voltage converter outputs electric energy to the electric equipment and outputs the electric energy to the energy storage module through the bidirectional direct current voltage converter; if the residual electric quantity is within a second electric quantity range, controlling the bidirectional direct-current voltage converter to work so that the energy storage module outputs electric energy to the electric equipment through the bidirectional direct-current voltage converter; the maximum value of the first range of electrical quantities is less than the minimum value of the second range of electrical quantities.
In the present application, a dc power distribution system includes an ac-dc voltage converter, a bi-directional dc voltage converter, an energy storage module, an energy storage manager, and a controller. The AC-DC voltage converter is connected between the AC bus and the first end of the bidirectional DC voltage converter. The first end of the bidirectional direct-current voltage converter is also connected with the electric equipment. And the second end of the bidirectional direct-current voltage converter is connected with the energy storage module. The detection end of the energy storage manager is connected with the energy storage module and used for detecting the residual electric quantity of the energy storage module and outputting the residual electric quantity to the controller. The controller is used for controlling the alternating current-direct current voltage converter and the bidirectional direct current voltage converter to work. When the direct current power distribution system works: if the residual electric quantity of the energy storage module is in a first electric quantity range with less electric quantity, the controller controls the alternating current-direct current voltage converter and the bidirectional direct current voltage converter to work, so that the alternating current-direct current voltage converter obtains the electric energy of the alternating current bus and outputs the electric energy to the electric equipment, and the energy storage module is charged through the bidirectional direct current voltage converter; if the residual electric quantity of the energy storage module is within the second electric quantity range with more electric quantity, the controller controls the bidirectional direct-current voltage converter to work, so that the energy storage module outputs electric energy to the electric equipment through the bidirectional direct-current voltage converter. This direct current distribution system, when the residual capacity of energy storage module is more, can be by energy storage module to consumer output direct current to for consumer provides the electric energy. So, can reduce the time length that the consumer provided the electric energy by exchanging the generating line to solve the alternating current distribution system to a certain extent and provide various problems that the electric energy brought for the consumer, promote the power supply electric energy quality.
Optionally, the dc power distribution system further includes: the bidirectional direct-current voltage converter, the energy storage manager and the energy storage module are all positioned in the power exchange cabinet;
the energy storage module comprises a first energy storage unit and a second energy storage unit which are connected in parallel, the first energy storage unit is fixedly connected with the battery replacing cabinet, and the second energy storage unit is detachably connected with the battery replacing cabinet.
Optionally, the dc power distribution system further includes: the photovoltaic generator and the unidirectional direct-current voltage converter;
the output end of the photovoltaic generator is connected with the input end of the unidirectional direct-current voltage converter, and the output end of the unidirectional direct-current voltage converter is connected with the first end of the bidirectional direct-current voltage converter and the electric equipment;
the controller is also connected with the output end of the photovoltaic generator to detect the output power of the photovoltaic generator, and is used for: if the residual electric quantity is within the first electric quantity range and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, the alternating current-direct current voltage converter, the bidirectional direct current voltage converter and the unidirectional direct current voltage converter are controlled to work, so that the alternating current-direct current voltage converter and the unidirectional direct current voltage converter output electric energy to the electric equipment and output the electric energy to the energy storage module through the bidirectional direct current voltage converter.
Optionally, the controller is to: if the current time is within a first time period, the residual electric quantity is within the first electric quantity range, and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, the alternating current-direct current voltage converter, the bidirectional direct current voltage converter and the unidirectional direct current voltage converter are controlled to work, so that the alternating current-direct current voltage converter and the unidirectional direct current voltage converter output electric energy to the electric equipment, and the bidirectional direct current voltage converter outputs the electric energy to the energy storage module.
Optionally, the controller is further configured to: if the residual electric quantity is in a third electric quantity range and the output power of the photovoltaic generator is equal to the rated power of the electric equipment, controlling the one-way direct-current voltage converter to work so that the one-way direct-current voltage converter outputs electric energy to the electric equipment; the minimum value of the third electric quantity range is greater than the maximum value of the first electric quantity range, and the maximum value of the third electric quantity range is greater than the minimum value of the second electric quantity range.
Optionally, the controller is further configured to: if the residual electric quantity is within a third electric quantity range and the output power of the photovoltaic generator is greater than the rated power of the electric equipment, controlling the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter to work so that the unidirectional direct-current voltage converter outputs electric energy to the electric equipment and outputs the electric energy to the energy storage module through the bidirectional direct-current voltage converter; the minimum value of the third electric quantity range is greater than the maximum value of the first electric quantity range, and the maximum value of the third electric quantity range is greater than the minimum value of the second electric quantity range.
Optionally, the dc power distribution system further includes: a photovoltaic monitor;
the input end of the photovoltaic monitor is connected with the second end of the bidirectional direct-current voltage converter, and the output end of the photovoltaic monitor is connected with the energy storage module;
the controller is also connected with the photovoltaic monitor, the controller is also used for: if the residual electric quantity is in the third electric quantity range and the output power of the photovoltaic generator is greater than the rated power of the electric equipment, controlling the photovoltaic monitor to work so that the bidirectional direct-current voltage converter outputs electric energy to the energy storage module through the photovoltaic monitor;
when the photovoltaic monitor works, the electric quantity, the current and the voltage of the electric energy output by the bidirectional direct-current voltage converter are detected; the minimum value of the third electric quantity range is greater than the maximum value of the first electric quantity range, and the maximum value of the third electric quantity range is greater than the minimum value of the second electric quantity range.
Optionally, the controller is further configured to: and if the residual electric quantity is within the second electric quantity range and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, controlling the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter to work so that the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter both output electric energy to the electric equipment.
Optionally, the controller is further configured to: if the current time is in a first time period, the residual electric quantity is in a third electric quantity range, and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, controlling the alternating current-direct current voltage converter, the unidirectional direct current voltage converter and the bidirectional direct current voltage converter to work so that the alternating current-direct current voltage converter and the unidirectional direct current voltage converter output electric energy to the electric equipment and output the electric energy to the energy storage module through the bidirectional direct current voltage converter; the minimum value of the third electric quantity range is greater than the maximum value of the first electric quantity range, and the maximum value of the third electric quantity range is greater than the minimum value of the second electric quantity range.
Optionally, the controller is further configured to: and if the current time is in a second time period, the residual electric quantity is in the third electric quantity range, and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, controlling the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter to work so that the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter both output electric energy to the electric equipment.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first dc power distribution system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a battery replacement cabinet provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a second dc power distribution system provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a third dc power distribution system provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a fourth dc power distribution system according to an embodiment of the present application.
Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:
10. a direct current power distribution system;
12. a direct current bus;
122. a positive bus bar;
124. a negative bus bar;
14. a power exchange cabinet;
1402. a thermal insulation layer;
1404. an energy storage protection device;
110. an AC-DC voltage converter;
120. a bi-directional DC voltage converter;
130. an energy storage module;
132. a first energy storage unit;
134. a second energy storage unit;
140. an energy storage manager;
150. a controller;
160. a photovoltaic generator;
162. a DC combiner box;
170. a unidirectional direct current voltage converter;
180. a photovoltaic monitor;
20. an alternating current bus;
30. an electricity-consuming device;
310. a power distribution cabinet;
320. low voltage dc power consumers;
330. high voltage direct current consumer.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that reference to "a plurality" in this application means two or more. In the description of the present application, "/" means "or" unless otherwise stated, for example, a/B may mean a or B; "and/or" herein is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, for the convenience of clearly describing the technical solutions of the present application, the terms "first", "second", and the like are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
The dc power distribution system provided by the embodiments of the present application is explained in detail below. In the embodiments of the present application, the connection between two electrical devices is referred to as an electrical connection. The electrical connection here means that two electrical devices are connected through a wire to realize the transmission of electrical energy.
Fig. 1 is a schematic structural diagram of a dc power distribution system 10 according to an embodiment of the present disclosure. Referring to fig. 1, a dc power distribution system 10 includes: ac-dc voltage converter 110, bi-directional dc voltage converter 120, energy storage module 130, energy storage manager 140, and controller 150.
The ac/dc voltage converter 110 is a converter that rectifies ac power into dc power and performs voltage conversion on the ac power before rectification or/and the dc power after rectification. For example, the ac-dc voltage converter 110 may include a transformer for converting the ac power and a full-bridge rectifier for rectifying the converted ac power into dc power, which are connected in sequence. The ac-dc voltage converter 110 has an input terminal and an output terminal. The input end of the ac/dc voltage converter 110 is connected to the ac bus 20, and the output end of the ac/dc voltage converter 110 is connected to the first end of the bidirectional dc voltage converter 120 and the electric device 30. In this way, when the ac/dc voltage converter 110 is operating, the ac/dc voltage converter 110 can obtain the electric energy (ac power) in the ac bus 20 and output the electric energy (dc power) to the bidirectional dc voltage converter 120 and the electric equipment 30. In some specific embodiments, AC/DC voltage converter 110 is used to convert 10kV AC power to 375V (volts) DC power.
The bidirectional dc voltage converter 120 refers to a converter for voltage-converting dc power. The bi-directional dc voltage converter 120 has a first terminal and a second terminal. When the bidirectional dc voltage converter 120 works, the first terminal may be used for inputting dc power, and the second terminal may be used for outputting dc power; or the second end is used for inputting direct current, and the first end is used for outputting direct current. For example, the bidirectional dc voltage converter 120 may be a Boost-Buck circuit (a Buck-Boost converter circuit), which may operate in a Boost mode or a Buck mode, and when a first end of the Boost-Buck circuit is used for inputting dc power and a second end of the Boost-Buck circuit is used for outputting dc power, the Boost-Buck circuit operates in the Buck mode; when the second end of the Boost-Buck circuit is used for inputting direct current and the first end of the Boost-Buck circuit is used for outputting the direct current, the Boost-Buck circuit works in a boosting mode. The first terminal of the bi-directional dc-to-dc converter 120 is connected to the output terminal of the ac-to-dc converter 110 and the electronic device. A second terminal of the bi-directional dc voltage converter 120 is connected to the energy storage module 130. Thus, when the bidirectional dc voltage converter 120 is operated, in one case, the electric energy (dc power) output by the ac/dc voltage converter 110 can be obtained and output to the energy storage module 130; in another case, the electric energy (dc power) output by the energy storage module 130 may be obtained and output to the electric device 30.
The energy storage manager 140 may be a SOC (System on Chip) on which a BMS (Battery management System) is stored. The energy storage manager 140 may detect an operating state of the energy storage module 130, such as a remaining capacity, a voltage, a current, a temperature, and the like. The energy storage manager 140 has a sensing terminal and an output terminal. The detection terminal of the energy storage manager 140 is connected to the energy storage module 130, so as to detect the remaining capacity of the energy storage module 130. The output terminal of the energy storage manager 140 is connected to the controller 150, so as to output the detected remaining amount of the energy storage module 130 to the controller 150.
The controller 150 may be a system on chip storing a preset program. In the embodiment of the present application, the controller 150 is further connected to the control terminal of the ac-dc voltage converter 110 and the control terminal of the bidirectional dc voltage converter 120. The controller 150 is configured to: and controlling the operation of the AC/DC voltage converter 110 and the bidirectional DC voltage converter 120 according to the residual electric quantity of the energy storage module 130.
Specifically, a first power range and a second power range may be provided within the controller 150. The maximum value of the first range of electric quantities is smaller than the minimum value of the second range of electric quantities. In other words, any value in the first range of electrical quantities is less than any value in the second range of electrical quantities. After obtaining the remaining power of the energy storage module 130, if the remaining power is within the first power range, the controller 150 controls the ac-dc voltage converter 110 to operate, and controls the first terminal of the bidirectional dc voltage converter 120 to input power and the second terminal to output power. In this case, the ac/dc voltage converter 110 obtains ac power from the ac bus 20, outputs power to the electric device 30, and outputs power to the energy storage module 130 through the bidirectional dc voltage converter 120. In this way, the consumer 30 is supplied with power on the one hand and the energy storage module 130 is charged on the other hand. If the remaining power is within the second power range, only the second terminal of the bi-directional dc voltage converter 120 is controlled to input power, and the first terminal outputs power. In this case, the ac/dc voltage converter 110 does not operate, and the energy storage module 130 outputs the electric energy to the electric device 30 through the bidirectional dc voltage converter 120. That is, when the remaining amount of the energy storage module 130 is small, the dc power distribution system 10 obtains electric energy from the ac bus 20 to supply the electric power to the electric equipment 30, and charges the energy storage module 130. When the remaining amount of the energy storage module 130 is large, the energy storage module 130 may output the direct current to the electric device 30, so as to provide the electric power to the electric device 30. Therefore, the time length of the electric equipment 30 powered by the alternating current bus 20 can be reduced, various problems caused by the fact that the alternating current power distribution system provides electric energy for the electric equipment 30 are solved to a certain extent, and the quality of power supply electric energy is improved.
In some embodiments, as shown in fig. 1, the dc power distribution system 10 also includes a dc bus 12. The output end of the ac/dc voltage converter 110, the first end of the bidirectional dc voltage converter 120, and the electric device 30 are all connected to the dc bus 12, so that the output end of the ac/dc voltage converter 110, the first end of the bidirectional dc voltage converter 120, and the electric device 30 are electrically connected.
In some embodiments, the dc power distribution system 10 also includes a power change cabinet 14. Fig. 2 is a schematic structural diagram of the power change cabinet 14 according to an embodiment of the present application. As shown in fig. 2, the bi-directional dc voltage converter 120, the energy storage manager 140, and the energy storage module 130 may all be located within the power distribution cabinet 14.
Specifically, the energy storage module 130 may include a first energy storage unit 132 and a second energy storage unit 134. The first energy storage unit 132 and the second energy storage unit 134 are connected in parallel, and both can output electric energy to the electric device 30 through the bidirectional dc voltage converter 120. In some specific embodiments, each of the first energy storage unit 132 and the second energy storage unit 134 may be any one of a lithium ion battery, a lead acid battery, and a super capacitor. As in the embodiment shown in fig. 2, the energy storage module 130 includes two first energy storage units 132 and one second energy storage unit 134. The second energy storage unit 134 may be a lithium ion battery. The two first energy storage units 132 may be one lithium ion battery and the other lead acid battery.
In the embodiment of the present application, the first energy storage unit 132 is located in the power conversion cabinet 14 and is fixedly connected to the power conversion cabinet 14, so that the first energy storage unit 132 and the second end of the bidirectional dc-dc voltage converter 120 are electrically connected. The second energy storage unit 134 is detachably connected to the power conversion cabinet 14, so that the second energy storage unit 134 can be located in the power conversion cabinet 14 or taken out of the power conversion cabinet 14. When the second energy storage unit 134 is located in the power conversion cabinet 14, the second energy storage unit 134 is electrically connected to the second end of the bidirectional dc-to-dc converter 120; when the second energy storage unit 134 is taken out of the battery replacement cabinet 14, the second energy storage unit 134 does not have an electrical connection relationship with the second end of the bidirectional dc-to-dc voltage converter 120. In this way, the second energy storage unit 134 can be taken out from the battery replacing cabinet 14 to supply power to other electric devices 30 which are not connected to the first end of the bidirectional dc voltage converter 120, and since the first energy storage unit 132 and the second energy storage unit 134 are connected in parallel, the output voltage of the energy storage module 130 is not affected by the taking out of the second energy storage unit 134, so that the flexibility of the dc power distribution system 10 can be improved.
Further, as shown in fig. 2, the dc power distribution system 10 may further include an energy storage protection device 1404. The energy storage protection device 1404 may also be located within the charging cabinet 14. The energy storage protection device 1404 may be connected between the energy storage module 130 and the second end of the bi-directional dc voltage converter 120, so that the energy storage module 130 and the bi-directional dc voltage converter 120 may transmit electric energy therebetween through the energy storage protection device 1404. The energy storage protection device 1404 is also connected to the energy storage manager 140 to be controlled by the energy storage manager 140. For example, the energy storage protection device 1404 may include a dc circuit breaker, and when the dc circuit breaker in the energy storage protection device 1404 is closed, power transmission may be performed between the energy storage module 130 and the bidirectional dc-to-dc converter 120; when the dc breaker in the energy storage protection device 1404 is open, no power transfer is possible between the energy storage module 130 and the bi-directional dc voltage converter 120. When the energy storage manager 140 operates, the operating state of the energy storage module 130, such as the remaining capacity, voltage, current, and temperature, is detected. If the working state of the energy storage module 130 is abnormal, such as the remaining power is too low, the voltage is too high, the current is too high, or the temperature is too high, the energy storage manager 140 may control the dc circuit breaker in the energy storage protection device 1404 to be turned off, so that the energy storage module 130 stops outputting the electric energy or inputting the electric energy, thereby achieving the purpose of protecting the dc power distribution system 10. The switchgear 14 may further have a thermal insulation layer 1402 therein, where the thermal insulation layer 1402 is used to divide the space inside the switchgear 14 into two areas, one area is used to place the energy storage manager 140 and the energy storage module 130, and the other area is used to place the bidirectional dc voltage converter 120 and the energy storage protection device 1404. The presence of insulation layer 1402 may reduce the probability of a fire occurring within the switchgear 14. In some specific embodiments, when the energy storage manager 140 detects that the energy storage module 130 is in the overcharged state, the energy storage protection device 1404 is controlled to be turned off after a delay of two seconds, so that the energy storage module 130 stops charging; when the energy storage manager 140 detects that the energy storage module 130 is in the over-discharge state, the energy storage protection device 1404 is controlled to be turned off after a delay of two seconds, so that the energy storage module 130 stops discharging. When the energy storage manager 140 detects a short circuit of the energy storage module 130, the energy storage protection device 1404 is immediately controlled to be turned off.
In some embodiments, as shown in fig. 3, the dc power distribution system 10 further includes a photovoltaic generator 160 and a unidirectional dc voltage converter 170.
The photovoltaic generator 160 refers to a converter that converts light energy into electrical energy. For example, the photovoltaic generator 160 may include a solar panel or the like. The photovoltaic generator 160 has an output, and the output of the photovoltaic generator 160 is used to output electrical energy. The output of the photovoltaic generator 160 is connected to the input of a unidirectional dc voltage converter 170. Thus, when the photovoltaic generator 160 operates, the photovoltaic generator 160 can output electric energy to the unidirectional dc voltage converter 170. In some embodiments, the photovoltaic generator 160 may be integrated with an MPPT (maximum power point tracking) controller 150, so that the photovoltaic generator 160 can output electric energy at the maximum power within a certain illumination intensity range, which is not described herein.
The unidirectional dc voltage converter 170 refers to a converter for voltage-converting a dc power. For example, the unidirectional dc voltage converter 170 may be a Boost circuit (Boost converter circuit) for boosting the dc power and outputting the boosted dc power. The input end of the unidirectional dc voltage converter 170 is connected to the output end of the photovoltaic generator 160, and the output end of the unidirectional dc voltage converter 170 may be connected to the first ends of the electric device 30 and the bidirectional dc voltage converter 120. In this way, when the unidirectional dc voltage converter 170 works, the unidirectional dc voltage converter 170 can obtain the electric energy output by the photovoltaic generator 160 and output the electric energy to the electric device 30. Meanwhile, after the unidirectional dc voltage converter 170 obtains the electric energy output by the photovoltaic generator 160, the bidirectional dc voltage converter 120 may output the electric energy to the energy storage module 130.
The controller 150 may also be connected to the output terminal of the photovoltaic generator 160, so as to detect the output power of the photovoltaic generator 160 and control the operation of the ac/dc converter 110, the bidirectional dc voltage converter 120 and the unidirectional dc voltage converter 170 according to the output power of the photovoltaic generator 160 and the remaining power of the energy storage module 130.
Specifically, the controller 150 may store therein the rated power of the powered device 30. The rated power of the electric device 30 is the power of the electric device 30 when it normally operates. After obtaining the remaining power of the energy storage module 130 and the output power of the photovoltaic generator 160, if the remaining power is within the first power range and the output power of the photovoltaic generator 160 is smaller than the rated power of the power-consuming equipment 30, the controller 150 controls the ac/dc converter 110 and the unidirectional dc voltage converter 170 to operate, and controls the first end of the bidirectional dc voltage converter 120 to input electric energy and the second end to output electric energy. In this case, the unidirectional dc voltage converter 170 obtains the electric energy output by the photovoltaic generator 160, and the ac/dc voltage converter 110 obtains the ac power of the ac bus 20. The unidirectional dc voltage converter 170 outputs the electric power to the electric device 30 together with the ac/dc voltage converter 110, and outputs the electric power to the energy storage module 130 through the bidirectional dc voltage converter 120. In this way, the consumer 30 is supplied with power on the one hand and the energy storage module 130 is charged on the other hand.
Further, in some embodiments, in addition to the output power of the photovoltaic generator 160 and the remaining capacity of the energy storage module 130, the controller 150 may control the ac-dc voltage converter 110, the bidirectional dc voltage converter 120, and the unidirectional dc voltage converter 170 to operate according to the time period of the present moment.
Specifically, a first time period and a second time period may be provided within the controller 150. The first and second periods differ in that: in the first time period, the dc power distribution system 10 requires fewer resources to obtain power from the ac bus 20; during the second time period, the dc power distribution system 10 requires more selfing to obtain power from the ac bus 20. For example, the first time period may be a low-rate time period of an area in which the dc power distribution system 10 is used, and the second time period may be a high-rate time period of the area in which the dc power distribution system 10 is used. When controlling the ac/dc voltage converter 110, the bidirectional dc voltage converter 120, and the unidirectional dc voltage converter 170 to operate, the controller 150 may further obtain a current time, and control the ac/dc voltage converter 110, the bidirectional dc voltage converter 120, and the unidirectional dc voltage converter 170 to operate according to a time period of the current time, an output power of the photovoltaic generator 160, and a remaining power of the energy storage module 130.
In the following, various embodiments will be described, in which the controller 150 controls the ac-dc voltage converter 110, the bidirectional dc voltage converter 120, and the unidirectional dc voltage converter 170 to operate according to the output power of the photovoltaic generator 160, the remaining capacity of the energy storage module 130, and the time period of the present moment. It should be noted that the output power of the photovoltaic generator 160 includes three cases, that is, the output power of the photovoltaic generator 160 is greater than the rated power of the electric device 30, the output power of the photovoltaic generator 160 is equal to the rated power of the electric device 30, and the output power of the photovoltaic generator 160 is less than the rated power of the electric device 30. The remaining capacity of the energy storage module 130 includes three conditions that the remaining capacity is within the first capacity range, the remaining capacity is within the third capacity range, and the remaining capacity is within the second capacity range. Wherein the minimum value of the third electric quantity range is greater than the maximum value of the first electric quantity range, and the maximum value of the third electric quantity range is greater than the minimum value of the second electric quantity range. In the embodiment of the present application, when the remaining capacity of the energy storage module 130 is within the first capacity range, which indicates that the remaining capacity of the energy storage module 130 is too low, the energy storage manager 140 may control the energy storage protection device 1404 to stop the energy storage module 130 from outputting electric energy. When the remaining power of the energy storage module 130 is within the second power range, which indicates that the energy storage module 130 is full, the energy storage manager 140 may control the energy storage protection device 1404 to stop inputting power to the energy storage module 130, or the controller 150 may control the bidirectional dc-dc converter 120 to stop outputting power to the energy storage module 130. When the remaining power of the energy storage module 130 is within the third power range, it indicates that the power of the energy storage module 130 is not full, but still has a certain amount of power, and at this time, the energy storage module 130 may output power or may input power. The time period of the current time includes a first time period and a second time period, and in the first time period, the resources required by the direct current power distribution system 10 to obtain the electric energy from the alternating current bus 20 are less; during the second time period, the dc power distribution system 10 requires more selfing to obtain power from the ac bus 20.
In the first case, the output power of the photovoltaic generator 160 is greater than the rated power of the electric device 30, the remaining power is in the first power range, and the current time is in the first time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170, and controls the first terminal of the bidirectional dc voltage converter 120 to input power and the second terminal to output power. In this case, the ac/dc voltage converter 110 does not operate. After passing through the unidirectional dc voltage converter 170, the dc power output from the photovoltaic generator 160 is output to the electric equipment 30 for the electric equipment 30 to work, and is output to the energy storage module 130 through the bidirectional dc voltage converter 120 for charging the energy storage module 130.
In the second case, the output power of the photovoltaic generator 160 is greater than the rated power of the electric device 30, the remaining capacity is within the first capacity range, and the current time is within the second time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170, and controls the first terminal of the bidirectional dc voltage converter 120 to input power and the second terminal to output power. In this case, the ac/dc voltage converter 110 does not operate. After passing through the unidirectional dc voltage converter 170, the dc power output from the photovoltaic generator 160 is output to the electric equipment 30 for the electric equipment 30 to work, and is output to the energy storage module 130 through the bidirectional dc voltage converter 120 for charging the energy storage module 130.
In the third case, the output power of the photovoltaic generator 160 is greater than the rated power of the electric device 30, the remaining power is in the third power range, and the current time is in the first time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170, and controls the first terminal of the bidirectional dc voltage converter 120 to input power and the second terminal to output power. In this case, the ac/dc voltage converter 110 does not operate. After passing through the unidirectional dc voltage converter 170, the dc power output from the photovoltaic generator 160 is output to the electric equipment 30 for the electric equipment 30 to work, and is output to the energy storage module 130 through the bidirectional dc voltage converter 120 for charging the energy storage module 130.
In the fourth case, the output power of the photovoltaic generator 160 is greater than the rated power of the electric device 30, the remaining power is in the third power range, and the current time is in the second time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170, and controls the first terminal of the bidirectional dc voltage converter 120 to input power and the second terminal to output power. In this case, the ac/dc voltage converter 110 does not operate. After passing through the unidirectional dc voltage converter 170, the dc power output from the photovoltaic generator 160 is output to the electric equipment 30 for the electric equipment 30 to work, and is output to the energy storage module 130 through the bidirectional dc voltage converter 120 for charging the energy storage module 130.
In the fifth case, the output power of the photovoltaic generator 160 is greater than the rated power of the electric device 30, the remaining power is in the second power range, and the current time is in the first time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170. In this case, the bidirectional dc voltage converter 120 and the ac/dc voltage converter 110 do not operate. The direct current output by the photovoltaic generator 160 passes through the unidirectional direct current voltage converter 170 and is then output to the electric equipment 30, i.e., the unidirectional direct current voltage converter 170 outputs electric energy to the electric equipment 30.
In the sixth case, the output power of the photovoltaic generator 160 is greater than the rated power of the electric device 30, the remaining power is in the second power range, and the current time is in the second time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170. In this case, the bidirectional dc voltage converter 120 and the ac/dc voltage converter 110 do not operate. The direct current output by the photovoltaic generator 160 passes through the unidirectional direct current voltage converter 170 and is then output to the electric equipment 30, i.e., the unidirectional direct current voltage converter 170 outputs electric energy to the electric equipment 30.
In the seventh case, the output power of the photovoltaic generator 160 is equal to the rated power of the electric device 30, the remaining power is in the first power range, and the current time is in the first time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170. In this case, the bidirectional dc voltage converter 120 and the ac/dc voltage converter 110 do not operate. The direct current output by the photovoltaic generator 160 passes through the unidirectional direct current voltage converter 170 and is then output to the electric equipment 30, i.e., the unidirectional direct current voltage converter 170 outputs electric energy to the electric equipment 30.
In the eighth case, the output power of the photovoltaic generator 160 is equal to the rated power of the electric device 30, the remaining power is in the first power range, and the current time is in the second time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170. In this case, the bidirectional dc voltage converter 120 and the ac/dc voltage converter 110 do not operate. The direct current output by the photovoltaic generator 160 passes through the unidirectional direct current voltage converter 170 and is then output to the electric equipment 30, i.e., the unidirectional direct current voltage converter 170 outputs electric energy to the electric equipment 30.
In the ninth case, the output power of the photovoltaic generator 160 is equal to the rated power of the electric device 30, the remaining power is in the third power range, and the current time is in the first time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170. In this case, the bidirectional dc voltage converter 120 and the ac/dc voltage converter 110 do not operate. The direct current output by the photovoltaic generator 160 passes through the unidirectional direct current voltage converter 170 and is then output to the electric equipment 30, i.e., the unidirectional direct current voltage converter 170 outputs electric energy to the electric equipment 30.
In the tenth case, the output power of the photovoltaic generator 160 is equal to the rated power of the electric device 30, the remaining power is in the third power range, and the current time is in the second time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170. In this case, the bidirectional dc voltage converter 120 and the ac/dc voltage converter 110 do not operate. The direct current output by the photovoltaic generator 160 passes through the unidirectional direct current voltage converter 170 and is then output to the electric equipment 30, i.e., the unidirectional direct current voltage converter 170 outputs electric energy to the electric equipment 30.
In the eleventh case, the output power of the photovoltaic generator 160 is equal to the rated power of the electric device 30, the remaining power is in the second power range, and the current time is in the first time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170. In this case, the bidirectional dc voltage converter 120 and the ac/dc voltage converter 110 do not operate. The direct current output by the photovoltaic generator 160 passes through the unidirectional direct current voltage converter 170 and is then output to the electric equipment 30, i.e., the unidirectional direct current voltage converter 170 outputs electric energy to the electric equipment 30.
In the twelfth case, the output power of the photovoltaic generator 160 is equal to the rated power of the electric device 30, the remaining power is in the second power range, and the current time is in the second time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170. In this case, the bidirectional dc voltage converter 120 and the ac/dc voltage converter 110 do not operate. The direct current output by the photovoltaic generator 160 passes through the unidirectional direct current voltage converter 170 and is then output to the electric equipment 30, i.e., the unidirectional direct current voltage converter 170 outputs electric energy to the electric equipment 30.
In the thirteenth case, the output power of the photovoltaic generator 160 is smaller than the rated power of the electric device 30, the remaining power is in the first power range, and the current time is in the first time period. At this time, the controller 150 controls the ac/dc voltage converter 110 and the unidirectional dc voltage converter 170 to operate, and controls the first terminal of the bidirectional dc voltage converter 120 to input power and the second terminal to output power. In this case, the unidirectional dc voltage converter 170 obtains the electric energy output by the photovoltaic generator 160, and the ac/dc voltage converter 110 obtains the ac power of the ac bus 20. The unidirectional dc voltage converter 170 outputs the electric power to the electric device 30 together with the ac/dc voltage converter 110, and outputs the electric power to the energy storage module 130 through the bidirectional dc voltage converter 120.
In the fourteenth case, the output power of the photovoltaic generator 160 is smaller than the rated power of the electric device 30, the remaining power is in the first power range, and the current time is in the second time period. At this time, the controller 150 controls the ac/dc voltage converter 110 and the unidirectional dc voltage converter 170 to operate. In this case, the bidirectional dc voltage converter 120 does not operate. The unidirectional dc voltage converter 170 obtains the electric energy output by the photovoltaic generator 160, and the ac/dc voltage converter 110 obtains the ac power of the ac bus 20. The unidirectional dc voltage converter 170 outputs electric power to the electric power-using device 30 together with the ac/dc voltage converter 110.
In the fifteenth case, the output power of the photovoltaic generator 160 is smaller than the rated power of the electric device 30, the remaining power is in the third power range, and the current time is in the first time period. At this time, the controller 150 controls the ac/dc voltage converter 110 and the unidirectional dc voltage converter 170 to operate, and controls the first terminal of the bidirectional dc voltage converter 120 to input power and the second terminal to output power. In this case, the unidirectional dc voltage converter 170 obtains the electric energy output by the photovoltaic generator 160, and the ac/dc voltage converter 110 obtains the ac power of the ac bus 20. The unidirectional dc voltage converter 170 outputs the electric power to the electric device 30 together with the ac/dc voltage converter 110, and outputs the electric power to the energy storage module 130 through the bidirectional dc voltage converter 120.
In the sixteenth situation, the output power of the photovoltaic generator 160 is smaller than the rated power of the electric device 30, the remaining power is in the third power range, and the current time is in the second time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170, and controls the second terminal of the bidirectional dc voltage converter 120 to input power and the first terminal to output power. In this case, the ac/dc voltage converter 110 does not operate. The unidirectional dc voltage converter 170 obtains the electric energy output by the photovoltaic generator 160, and the bidirectional dc voltage converter 120 obtains the electric energy output by the energy storage module 130. The unidirectional dc voltage converter 170 and the bidirectional dc voltage converter 120 together output power to the electric device 30.
In the seventeenth situation, the output power of the photovoltaic generator 160 is smaller than the rated power of the electric device 30, the remaining power is in the second power range, and the current time is in the first time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170, and controls the second terminal of the bidirectional dc voltage converter 120 to input power and the first terminal to output power. In this case, the ac/dc voltage converter 110 does not operate. The unidirectional dc voltage converter 170 obtains the electric energy output by the photovoltaic generator 160, and the bidirectional dc voltage converter 120 obtains the electric energy output by the energy storage module 130. The unidirectional dc voltage converter 170 and the bidirectional dc voltage converter 120 together output power to the electric device 30.
In the eighteenth case, the output power of the photovoltaic generator 160 is smaller than the rated power of the electric device 30, the remaining power is in the second power range, and the current time is in the second time period. At this time, the controller 150 controls the operation of the unidirectional dc voltage converter 170, and controls the second terminal of the bidirectional dc voltage converter 120 to input power and the first terminal to output power. In this case, the ac/dc voltage converter 110 does not operate. The unidirectional dc voltage converter 170 obtains the electric energy output by the photovoltaic generator 160, and the bidirectional dc voltage converter 120 obtains the electric energy output by the energy storage module 130. The unidirectional dc voltage converter 170 and the bidirectional dc voltage converter 120 together output power to the electric device 30.
In some embodiments, as shown in fig. 4, dc power distribution system 10 further includes a photovoltaic monitor 180.
The photovoltaic monitor 180 is used for monitoring the condition of the electric energy output from the photovoltaic generator 160 to the energy storage module 130. The power condition here includes the amount of electricity, current and voltage. For example, the photovoltaic monitor 180 may include an electric energy meter for counting the amount of electricity output by the photovoltaic generator 160 to the energy storage module 130; photovoltaic monitor 180 may include a voltmeter to detect the voltage output by photovoltaic generator 160 to energy storage module 130; the photovoltaic monitor 180 may include an ammeter for detecting the current output by the photovoltaic generator 160 to the energy storage module 130. Photovoltaic monitor 180 has an input and an output, the input of photovoltaic monitor 180 is connected to the second terminal of bi-directional dc voltage converter 120, and the output of photovoltaic monitor 180 is connected to energy storage module 130.
Specifically, after acquiring the remaining power of the energy storage module 130 and the output power of the photovoltaic generator 160, if the remaining power is in the first power range or the third power range and the output power of the photovoltaic generator 160 is greater than the rated power of the electric device 30, the controller 150 controls the photovoltaic monitor 180 to operate, so that the bidirectional dc voltage converter 120 outputs the electric energy to the energy storage module 130 through the photovoltaic monitor 180. At this time, the photovoltaic monitor 180 can detect the amount, current and voltage of the electric power output by the bi-directional dc voltage converter 120. That is, in the first, second, third and fourth cases, when the energy storage module 130 obtains and only obtains the electric energy output by the photovoltaic generator 160, the controller 150 controls the photovoltaic monitor 180 to operate, so as to detect the amount, current and voltage of the electric energy output by the bidirectional dc voltage converter 120 to the energy storage module 130. In other cases, the photovoltaic monitor 180 does not work, and at this time, the photovoltaic monitor 180 is in a short-circuited state, and the energy storage module 130 and the second end of the bidirectional dc voltage converter 120 can directly perform electric energy transmission therebetween.
In some embodiments, as shown in fig. 5, the dc bus 12 may include a positive bus 122 and a negative bus 124. The positive bus 122 and the negative bus 124 may have voltages of the same voltage value but opposite polarities, so that the dc bus 12 has a higher voltage. For example, the voltage on the positive bus 122 may be 375V, the voltage on the negative bus 124 may be-375V, and the voltage on the dc bus 12 may be 750V.
The dc power distribution system 10 may also include a dc combiner box 162. Specifically, the dc power distribution system 10 may include a plurality of photovoltaic generators 160 and a plurality of unidirectional dc voltage converters 170. The output terminals of the plurality of photovoltaic generators 160 and the input terminals of the plurality of unidirectional dc voltage converters 170 are connected one to one. The output terminals of the plurality of unidirectional dc voltage converters 170 are connected to the dc bus 12 through the dc combiner box 162. The dc combiner box 162 functions as: the electrical energy generated by the plurality of photovoltaic generators 160 is combined. In other embodiments, the dc combiner box 162 may also have a lightning protection function.
The electric devices 30 may include a high voltage dc electric device 330 and a low voltage dc electric device 320. The high-voltage dc consumer 330 may be, for example, a high-speed dc motor. The high pressure here may be 750V. The low-voltage dc electric device 320 may be, for example, an illumination lamp. The low pressure here may be 48V. Generally, when the electric device 30 includes the low-voltage dc electric device 320 and the voltage of the dc bus 12 is 750V, the power distribution cabinet 310 may be connected between the dc bus 12 and the low-voltage dc electric device 320. The input end of the power distribution cabinet 310 is connected with the dc bus 12, and the output end of the power distribution cabinet 310 is connected with the low-voltage dc electric device 320. The power distribution cabinet 310 may include a Buck circuit (step-down conversion circuit).
In the embodiment of the present application, the dc power distribution system 10 includes an ac/dc voltage converter 110, a bidirectional dc voltage converter 120, an energy storage module 130, an energy storage manager 140, and a controller 150. The ac-dc voltage converter 110 is connected between the ac bus 20 and a first end of the bi-directional dc voltage converter 120. The first terminal of the bi-directional dc voltage converter 120 is also connected to the consumer 30. A second terminal of the bi-directional dc voltage converter 120 is connected to the energy storage module 130. The detection terminal of the energy storage manager 140 is connected to the energy storage module 130, and is configured to detect a remaining amount of energy of the energy storage module 130 and output the remaining amount of energy to the controller 150. The controller 150 is used for controlling the ac-dc voltage converter 110 and the bi-directional dc voltage converter 120 to operate. When the dc power distribution system 10 is in operation: if the remaining power of the energy storage module 130 is in the first power range with less power, the controller 150 controls the ac-dc voltage converter 110 and the bidirectional dc voltage converter 120 to operate, so that the ac-dc voltage converter 110 obtains the power of the ac bus 20 and outputs the power to the power consuming device 30, and the bidirectional dc voltage converter 120 charges the energy storage module 130; if the remaining power of the energy storage module 130 is within the second power range with a larger power, the controller 150 controls the bidirectional dc voltage converter 120 to operate, so that the energy storage module 130 outputs power to the electric device 30 through the bidirectional dc voltage converter 120. When the remaining amount of the energy storage module 130 is large, the dc power distribution system 10 may output dc power to the electric device 30 from the energy storage module 130, so as to provide electric energy to the electric device 30. Therefore, the duration that the electric equipment 30 is provided with electric energy through the alternating current bus 20 can be reduced, various problems caused by the fact that the alternating current power distribution system provides the electric energy for the electric equipment 30 are solved to a certain extent, and the quality of the power supply electric energy is improved. Meanwhile, the use of the alternating current is reduced, so that the use of a three-level electric box and a cable in the alternating current distribution system can be reduced, and the construction convenience of constructors and the safety factor of a construction site are improved.
The energy storage module 130 may include a first energy storage unit 132 and a second energy storage unit 134. The first energy storage unit 132 and the second energy storage unit 134 are connected in parallel and are located in the power conversion cabinet 14. The first energy storage unit 132 is fixedly connected with the power exchange cabinet 14, and the second energy storage unit 134 is detachably connected with the power exchange cabinet 14. In this way, the second energy storage unit 134 can be taken out from the battery replacing cabinet 14 to supply power to other electric devices 30 which are not connected to the first end of the bidirectional dc voltage converter 120, and since the first energy storage unit 132 and the second energy storage unit 134 are connected in parallel, the output voltage of the energy storage module 130 is not affected by the taking out of the second energy storage unit 134, so that the flexibility of the dc power distribution system 10 can be improved. In the embodiment of the present application, the photovoltaic generator 160 is also used to supply power to the energy storage module 130 and the electric device 30, which is beneficial to environmental protection. The controller 150 adds the judgment of the time period of the current time when working, and stores the electric energy through the energy storage module 130, so that the resources required for obtaining the electric energy from the alternating current bus 20 can be reduced, and the peak clipping and valley filling of the electric energy consumption can be realized. The energy storage module 130 may further include a super capacitor to maintain the voltage of the dc bus 12 stable.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A direct current power distribution system, comprising: the system comprises an alternating current-direct current voltage converter, a bidirectional direct current voltage converter, an energy storage module, an energy storage manager and a controller;
the input end of the AC/DC voltage converter is connected with an AC bus, and the output end of the AC/DC voltage converter is connected with the first end of the bidirectional DC voltage converter;
the first end of the bidirectional direct-current voltage converter is also used for being connected with electric equipment, and the second end of the bidirectional direct-current voltage converter is connected with the energy storage module;
the detection end of the energy storage manager is connected with the energy storage module to detect the residual electric quantity of the energy storage module, and the output end of the energy storage manager is connected with the controller to output the residual electric quantity to the controller;
the controller is also connected with the control end of the AC-DC voltage converter and the control end of the bidirectional DC voltage converter, and the controller is used for: if the residual electric quantity is within a first electric quantity range, controlling the alternating current-direct current voltage converter and the bidirectional direct current voltage converter to work so that the alternating current-direct current voltage converter outputs electric energy to the electric equipment and outputs the electric energy to the energy storage module through the bidirectional direct current voltage converter; if the residual electric quantity is within a second electric quantity range, controlling the bidirectional direct-current voltage converter to work so that the energy storage module outputs electric energy to the electric equipment through the bidirectional direct-current voltage converter; the maximum value of the first range of electrical quantities is less than the minimum value of the second range of electrical quantities.
2. The dc power distribution system of claim 1, further comprising: the bidirectional direct-current voltage converter, the energy storage manager and the energy storage module are all positioned in the power exchange cabinet;
the energy storage module comprises a first energy storage unit and a second energy storage unit which are connected in parallel, the first energy storage unit is fixedly connected with the battery replacing cabinet, and the second energy storage unit is detachably connected with the battery replacing cabinet.
3. The dc power distribution system of claim 1, further comprising: the photovoltaic generator and the unidirectional direct-current voltage converter;
the output end of the photovoltaic generator is connected with the input end of the unidirectional direct-current voltage converter, and the output end of the unidirectional direct-current voltage converter is connected with the first end of the bidirectional direct-current voltage converter and the electric equipment;
the controller is also connected with the output end of the photovoltaic generator to detect the output power of the photovoltaic generator, and is used for: if the residual electric quantity is within the first electric quantity range and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, the alternating current-direct current voltage converter, the bidirectional direct current voltage converter and the unidirectional direct current voltage converter are controlled to work, so that the alternating current-direct current voltage converter and the unidirectional direct current voltage converter output electric energy to the electric equipment and output the electric energy to the energy storage module through the bidirectional direct current voltage converter.
4. The direct current power distribution system of claim 3, wherein the controller is to: if the current time is within a first time period, the residual electric quantity is within the first electric quantity range, and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, the alternating current-direct current voltage converter, the bidirectional direct current voltage converter and the unidirectional direct current voltage converter are controlled to work, so that the alternating current-direct current voltage converter and the unidirectional direct current voltage converter output electric energy to the electric equipment, and the bidirectional direct current voltage converter outputs the electric energy to the energy storage module.
5. The direct current power distribution system of claim 3, wherein the controller is further configured to: if the residual electric quantity is in a third electric quantity range and the output power of the photovoltaic generator is equal to the rated power of the electric equipment, controlling the one-way direct-current voltage converter to work so that the one-way direct-current voltage converter outputs electric energy to the electric equipment; the minimum value of the third electric quantity range is greater than the maximum value of the first electric quantity range, and the maximum value of the third electric quantity range is greater than the minimum value of the second electric quantity range.
6. The direct current power distribution system of claim 3, wherein the controller is further configured to: if the residual electric quantity is within a third electric quantity range and the output power of the photovoltaic generator is greater than the rated power of the electric equipment, controlling the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter to work so that the unidirectional direct-current voltage converter outputs electric energy to the electric equipment and outputs the electric energy to the energy storage module through the bidirectional direct-current voltage converter; the minimum value of the third electric quantity range is greater than the maximum value of the first electric quantity range, and the maximum value of the third electric quantity range is greater than the minimum value of the second electric quantity range.
7. The dc power distribution system of claim 6, further comprising: a photovoltaic monitor;
the input end of the photovoltaic monitor is connected with the second end of the bidirectional direct-current voltage converter, and the output end of the photovoltaic monitor is connected with the energy storage module;
the controller is also connected with the photovoltaic monitor, the controller is also used for: if the residual electric quantity is in the third electric quantity range and the output power of the photovoltaic generator is greater than the rated power of the electric equipment, controlling the photovoltaic monitor to work so that the bidirectional direct-current voltage converter outputs electric energy to the energy storage module through the photovoltaic monitor;
when the photovoltaic monitor works, the electric quantity, the current and the voltage of the electric energy output by the bidirectional direct-current voltage converter are detected; the minimum value of the third electric quantity range is greater than the maximum value of the first electric quantity range, and the maximum value of the third electric quantity range is greater than the minimum value of the second electric quantity range.
8. The direct current power distribution system of claim 3, wherein the controller is further configured to: and if the residual electric quantity is within the second electric quantity range and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, controlling the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter to work so that the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter both output electric energy to the electric equipment.
9. The direct current power distribution system of claim 3, wherein the controller is further configured to: if the current time is in a first time period, the residual electric quantity is in a third electric quantity range, and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, controlling the alternating current-direct current voltage converter, the unidirectional direct current voltage converter and the bidirectional direct current voltage converter to work so that the alternating current-direct current voltage converter and the unidirectional direct current voltage converter output electric energy to the electric equipment and output the electric energy to the energy storage module through the bidirectional direct current voltage converter; the minimum value of the third electric quantity range is greater than the maximum value of the first electric quantity range, and the maximum value of the third electric quantity range is greater than the minimum value of the second electric quantity range.
10. The direct current power distribution system of claim 9, wherein the controller is further configured to: and if the current time is in a second time period, the residual electric quantity is in the third electric quantity range, and the output power of the photovoltaic generator is smaller than the rated power of the electric equipment, controlling the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter to work so that the unidirectional direct-current voltage converter and the bidirectional direct-current voltage converter both output electric energy to the electric equipment.
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| CN202210074415.8A CN114512976A (en) | 2022-01-21 | 2022-01-21 | Direct current distribution system |
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| CN202210074415.8A CN114512976A (en) | 2022-01-21 | 2022-01-21 | Direct current distribution system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115668686A (en) * | 2022-09-05 | 2023-01-31 | 航霈科技(深圳)有限公司 | Power supply device, method and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115668686A (en) * | 2022-09-05 | 2023-01-31 | 航霈科技(深圳)有限公司 | Power supply device, method and system |
| CN115668686B (en) * | 2022-09-05 | 2024-02-02 | 航霈科技(深圳)有限公司 | Power supply device, method and system |
| WO2024050656A1 (en) * | 2022-09-05 | 2024-03-14 | 航霈科技(深圳)有限公司 | Power supply apparatus, method and system |
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