CN107516893B - Energy router and power generation control method based on same - Google Patents
Energy router and power generation control method based on same Download PDFInfo
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- CN107516893B CN107516893B CN201710618823.4A CN201710618823A CN107516893B CN 107516893 B CN107516893 B CN 107516893B CN 201710618823 A CN201710618823 A CN 201710618823A CN 107516893 B CN107516893 B CN 107516893B
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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
- H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The invention discloses an energy router and a power generation control method based on the energy router, which not only can ensure the stability of a system when a plurality of ports work cooperatively, but also make reasonable design on a working mode. The invention provides a seven-interface direct-current bus energy router model which comprises wind energy, photovoltaic power generation, energy storage, alternating current and direct current loads, a power grid and other energy router interfaces, and designs an energy router overall control strategy aiming at the framework, wherein the energy router overall control strategy comprises two working modes of power generation according to needs and power generation to the maximum extent, and energy can be reasonably transmitted.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to an energy router and a power generation control method based on the energy router.
Background
With the development of technologies such as distributed energy sources and micro-grids, a large number of energy supply or energy consumption devices need to be connected to an energy transmission network, and the traditional power transmission network cannot meet the requirement of wide access of various energy sources. The energy router can realize interconnection, scheduling and control of various energy networks. However, new energy power generation such as photovoltaic power generation, wind power generation and the like are greatly influenced by the environment, the generated energy is difficult to be accurately controlled, and the control constraint condition is more severe; the system composed of multiple power supplies has higher analysis difficulty and more complex control strategy; the multiple ports result in a great variety of possible working states of the energy router, and how to design a reasonable working mode is also a great challenge.
Disclosure of Invention
In view of this, embodiments of the present invention provide an energy router and a power generation control method based on the energy router, which not only can ensure stability of a system when multiple ports work cooperatively, but also make a reasonable design on a working mode.
In one aspect, an embodiment of the present invention provides an energy router, including:
the system comprises a photovoltaic converter and controller, an energy storage converter and controller, a wind power converter and controller, an energy router converter and controller, a power grid converter and controller, a direct current load converter and controller and an alternating current load converter and controller; wherein the content of the first and second substances,
the inner side positive electrodes of the photovoltaic converter and the controller are connected with the inner side positive electrodes of the power grid converter and the controller through a direct current bus, the inner side negative electrodes of the photovoltaic converter and the controller are connected with the inner side negative electrodes of the power grid converter and the controller through a direct current bus, a first node is connected with the direct current bus connected between the inner side positive electrodes of the photovoltaic converter and the controller and the inner side positive electrodes of the power grid converter and the controller, the inner side positive electrodes of the energy storage converter and the controller, a second node and the inner side positive electrodes of the direct current load converter and the controller, the second node is connected with the inner side positive electrodes of the wind power converter and the controller, the inner side positive electrodes of the energy router converter and the controller and the inner side positive electrodes of the alternating current load converter and the controller, and a third node is connected with the inner side negative electrodes of the energy storage converter and the controller, The direct current bus and the fourth node which are connected between the negative electrodes at the inner sides of the photovoltaic converter and the controller and the negative electrodes at the inner sides of the power grid converter and the controller, and the negative electrodes at the inner sides of the direct current load converter and the controller, the fourth node is connected with the negative electrodes at the inner sides of the wind power converter and the controller, the negative electrode at the inner side of the energy router converter and the controller and the negative electrode at the inner side of the alternating current load converter and the controller,
the photovoltaic converter and the outer side interface of the controller are connected with the photovoltaic array and are used for realizing constant voltage control and maximum power control of the power generation of the photovoltaic array; the energy storage converter and the outer side interface of the controller are connected with a storage battery and are used for realizing constant voltage charge and discharge control and maximum power charge and discharge control of the storage battery; the wind power converter and the outer side interface of the controller are connected with a wind power generator and are used for realizing constant voltage control and maximum power control of the power generation of the wind power generator; the energy router converter and the outer side interface of the controller are connected with other energy routers, and the energy router converter is used for outputting bus voltage to the other energy routers to supply energy to the other energy routers, or the other energy routers are used as power supplies to obtain electric energy from the other energy routers; the power grid converter is connected with the outer side interface of the controller through a power grid and used for realizing grid-connected power control; the direct current load converter and the outer side interface of the controller are connected with a direct current load, and the direct current load converter and the outer side interface of the controller are used for performing DCDC conversion on direct current bus voltage and outputting the direct current bus voltage to the direct current load, and controlling the connection and disconnection of an interface used for connecting the direct current load; the alternating current load converter and the outer side interface of the controller are connected with an alternating current load, and are used for performing DCAC conversion on the direct current bus voltage and outputting the direct current bus voltage to the alternating current load, and controlling the connection and disconnection of the interface used for connecting the alternating current load.
On the other hand, an embodiment of the present invention provides a power generation control method based on the energy router, including:
after receiving a power generation working mode instruction input by a user, a central controller acquires rated power of a photovoltaic interface, an energy storage interface, a wind power generation interface and other energy router interfaces, load power of an energy router and operation conditions of a power grid, wherein the power generation working mode instruction comprises a power generation working mode instruction according to needs and a maximum power generation working mode instruction, and the central controller is connected with the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller, the power grid converter and controller, the direct current load converter and controller and the alternating current load converter and controller;
the central controller determines the working modes of the photovoltaic interface, the energy storage interface, the wind power generation interface, the other energy router interfaces and the power grid interface according to the rated power of the photovoltaic interface, the energy storage interface, the wind power generation interface and the other energy router interfaces, the load power of the energy router and the running condition of the power grid, and issues corresponding working mode instructions to the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller, the power grid converter and controller, so that the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller, the power grid converter and controller carry out conversion on the photovoltaic interface, the energy storage interface, the wind power generation interface and the power grid interface according to the corresponding working mode instructions, And correspondingly adjusting the working modes of the wind power generation interface, the other energy router interfaces and the power grid interface.
The embodiment of the invention provides an energy router and a power generation control method based on the energy router, and provides a seven-interface direct current bus energy router which comprises wind energy, photovoltaic power generation, energy storage, an alternating current load, a direct current load, a power grid and other energy router interfaces.
Drawings
Fig. 1 is a schematic diagram of an energy router according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a power generation control method of an energy router according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present embodiment discloses an energy router, including:
the system comprises a photovoltaic converter and controller 1, an energy storage converter and controller 2, a wind power converter and controller 3, an energy router converter and controller 4, a power grid converter and controller 5, a direct current load converter and controller 6 and an alternating current load converter and controller 7; wherein the content of the first and second substances,
the inner side positive electrode of the photovoltaic converter and controller 1 is connected with the inner side positive electrode of the power grid converter and controller 5 through a direct current bus, the inner side negative electrode of the photovoltaic converter and controller 1 is connected with the inner side negative electrode of the power grid converter and controller 5 through a direct current bus, a first node is connected with the direct current bus connected between the inner side positive electrode of the photovoltaic converter and controller 1 and the inner side positive electrode of the power grid converter and controller 5, the inner side positive electrode of the energy storage converter and controller 2, a second node and the inner side positive electrode of the direct current load converter and controller 6, the second node is connected with the inner side positive electrode of the wind power converter and controller 3, the inner side positive electrode of the energy router converter and controller 4 and the inner side positive electrode of the alternating current load converter and controller 7, and a third node is connected with the inner side negative electrode of the energy storage converter and controller 2, A direct current bus connected between the cathode at the inner side of the photovoltaic converter and controller 1 and the cathode at the inner side of the grid converter and controller 5, a fourth node and the cathode at the inner side of the direct current load converter and controller 6, wherein the fourth node is connected with the cathode at the inner side of the wind power converter and controller 3, the cathode at the inner side of the energy router converter and controller 4 and the cathode at the inner side of the alternating current load converter and controller 7,
the photovoltaic converter and the outer side interface of the controller 1 are connected with a photovoltaic array and used for realizing constant voltage control and maximum power control of power generation of the photovoltaic array; the outer side interface of the energy storage converter and the controller 2 is connected with a storage battery and is used for realizing constant voltage charge and discharge control and maximum power charge and discharge control of the storage battery; the outer side interface of the wind power converter and the controller 3 is connected with a wind power generator and used for realizing constant voltage control and maximum power control of the power generation of the wind power generator; the energy router converter and the outer side interface of the controller 4 are connected with other energy routers, and the energy router converter and the other energy routers are used for outputting bus voltage to the other energy routers to supply energy to the other energy routers, or the other energy routers are used as power supplies to obtain electric energy from the other energy routers; the power grid converter is connected with the power grid through an outer side interface of the controller 5 and used for realizing grid-connected power control; the direct current load converter and the outer side interface of the controller 6 are connected with a direct current load, and are used for performing DCDC conversion (direct current-direct current conversion) on the direct current bus voltage, outputting the direct current load to the direct current load and controlling the on-off of the interface used for connecting the direct current load; the AC load converter and the outer side interface of the controller are connected with an AC load, and are used for performing DCAC conversion (direct current-alternating current conversion) on the DC bus voltage, outputting the DC bus voltage to the AC load, and controlling the on-off of the interface used for connecting the AC load.
Referring to fig. 2, the present embodiment discloses a power generation control method for an energy router based on the foregoing embodiments, including:
s1, after receiving a power generation working mode instruction input by a user, acquiring rated power of a photovoltaic interface, an energy storage interface, a wind power generation interface and other energy router interfaces, load power of an energy router and operation conditions of a power grid by a central controller, wherein the power generation working mode instruction comprises a power generation working mode instruction according to needs and a maximum power generation working mode instruction, and the central controller is connected with the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller, the power grid converter and controller, the direct current load converter and controller and the alternating current load converter and controller;
it can be understood that the central controller may obtain the rated power of the photovoltaic interface, the rated power of the energy storage interface, the rated power of the wind power generation interface, the rated power of other energy router interfaces, the operating condition of the power grid, the dc load power and the ac load power from the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller, the power grid converter and controller, the dc load converter and controller and the ac load converter and controller, respectively. And the sum of the DC load power and the AC load power is the load power of the energy router.
S2, the central controller determines the working modes of the photovoltaic interface, the energy storage interface, the wind power generation interface, other energy router interfaces and the power grid interface according to the rated power of the photovoltaic interface, the energy storage interface, the wind power generation interface and other energy router interfaces, the load power of the energy router and the running condition of the power grid, and sends corresponding working mode instructions to the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller, the power grid converter and controller, so that the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller and the power grid converter and controller send corresponding working mode instructions to the photovoltaic interface, the energy storage interface, the wind power converter and controller, the power grid converter and controller according to the corresponding working mode instructions, And the working modes of the energy storage interface, the wind power generation interface, the other energy router interfaces and the power grid interface are correspondingly adjusted.
The present invention is described in detail below.
As shown in fig. 1, the energy router architecture according to the present invention includes seven ports, including a wind energy interface, a photovoltaic power generation interface, an energy storage interface, an ac load interface, a dc load interface, a grid interface, and an energy router interface. The photovoltaic converter and the controller realize constant voltage control and maximum power tracking control of electric energy, and an outer interface of the photovoltaic converter is connected with a photovoltaic array; the energy storage converter and the controller realize constant voltage charge and discharge control and maximum power charge and discharge control, and an outer interface of the energy storage converter is connected with a storage battery; the wind power converter and the controller realize constant voltage control and maximum power control of wind power generation, and the outer side interface is connected with a wind power generator; the grid converter and the controller realize grid-connected power control, and the outer interface is connected with a power grid; the converter of the direct current load and the alternating current load and the outer side interface of the controller are respectively connected with the direct current load and the alternating current load and are respectively used for performing DCDC conversion and DCAC conversion on the direct current bus voltage and controlling the opening and closing of the corresponding ports; the energy router interface is the connection interface of other energy routers, is equipped with "can insert" warning light, and the warning light is bright can connect other energy routers, and energy router is as the power supply for other energy routers energy supply. The inner sides of all the modules are connected into a direct current bus inside the energy router. Except for two load interfaces, each interface can work in a constant voltage working mode and a maximum power working mode. The direct current load and the alternating current load are connected through the interface, and the detection device is arranged on the interface and detects the size of the load in real time.
The energy router can work in two working modes of generating power according to requirements and generating power to the maximum extent. In each working mode, in order to conveniently divide the working modes, the alternating current load and the direct current load are considered together according to the total power, for example, an energy router is connected to a 20kw direct current load and a 20kw alternating current load at a certain moment and is connected to a 40kw direct current load (or alternating current load) only at the same mode. When other energy routers access the current energy router to absorb energy, the current energy router is also considered as the load of the current router. P for load sizeloadIs represented by PPV、Pwind、PERRespectively representing the rated power, P, of the photovoltaic interface, the wind power generation interface and the energy router interfaceESIndicating the rated charging power or rated discharging power of the energy storage interface, according to PloadThe size divides the operation mode of the energy router from light to heavy into several types:
1. on-demand power generation mode of operation
The energy router generates power according to the load requirement in the working mode, the use times of the energy storage device can be reduced, the service life is prolonged, and the cost is reduced. There are 6 modes of operation, as shown in table 1.
TABLE 1 on-demand Power Generation mode Table
Mode 1: extremely light load
According to the illumination condition and the wind power condition in the current mode, the load power is lower than the rated power which is larger in the photovoltaic interface and the wind power interface. Namely:
Pload<max(PPV,Pwind)，
at the moment, the power is generated when the rated power is larger, and the power generator works in a constant voltage mode; the lower rated power is temporarily turned off. And the energy storage and power grid interface is switched off. Because the load demand of the energy router is small, the energy router has a large power generation potential at the moment, and has the capability of supporting the power utilization of other energy routers, and the interfaces of the other energy routers prompt that the energy router can be accessed.
Mode 2: the load is light
According to the illumination condition and the wind power condition in the current mode, power generation of any one interface of the photovoltaic interface and the wind power interface at rated power is not enough to meet the load requirement, but the total rated power of the two interfaces is higher than the load power. Namely:
max(PPV,Pwind)<Pload<(PPV+Pwind)，
at the moment, the photovoltaic interface and the wind power interface generate power with higher rated power and work in a constant voltage mode; the lower rated power generates power and works in a maximum power generation Mode (MPPT). And the energy storage and power grid interface is switched off. At the moment, the energy router still has a large power generation potential, and the interfaces of other energy routers prompt that the energy router is accessible.
Mode 3: in a medium load
According to the illumination condition and the wind power condition in the current mode, the photovoltaic interface and the wind power interface are not enough to meet the load requirement by generating power at rated power at the same time, but the total rated power of the rated discharge power of the energy storage interface is higher than the load power. Namely:
(PPV+Pwind)<Pload<(PPV+Pwind+PES)，
at the moment, the photovoltaic interface and the wind power interface work in a maximum power generation mode, and the energy storage interface works in a constant voltage mode; the "other energy router interfaces" are off and do not prompt "accessible". And (5) switching off the power grid interface.
Mode 4: loaded heavier
According to the illumination condition and the wind power condition in the current mode, the photovoltaic interface, the wind power interface and the energy storage interface are not enough to meet the load requirement by generating power at rated power at the same time, but the total rated power of the interfaces of the other energy routers is higher than the load power. Namely:
(PPV+Pwind+PES)<Pload<(PPV+Pwind+PES+PER)，
at the moment, the photovoltaic interface, the wind power interface and the energy storage interface simultaneously work in a maximum power generation mode, and the interfaces of other energy routers are connected to other energy routers which prompt that the interfaces can be connected and work in a constant voltage mode. And (5) switching off the power grid interface.
Mode 5: the load is very heavy
According to the illumination condition and the wind power condition in the current mode, the photovoltaic interface, the wind power interface, the energy storage interface and the other energy router interface are not enough to meet the load requirement by generating power at rated power at the same time. Namely:
Pload>(PPV+Pwind+PES+PER)，
at the moment, the photovoltaic interface, the wind power interface and the energy storage interface simultaneously work in a maximum power generation mode, the interfaces of other energy routers are connected to other energy routers which prompt that the interfaces can be connected and work in the maximum power generation mode, and the power grid interface works in a constant voltage mode. It can be understood that, after determining that the operating mode of the "other energy router interface" is "connected to the other energy router which prompts 'accessible' and operates in the maximum power generation mode", the central controller pops up a dialog box to prompt a user, then the user connects the "other energy router interface" to the other energy router which prompts "accessible", and then the energy router converter and controller detects that the "other energy router interface" is connected to the other energy router which prompts "accessible", and sends a corresponding message to the central controller, and the central controller sends an instruction to the energy router converter and controller according to the message, and the energy router converter and controller controls the "other energy router interface" to operate in the constant voltage mode according to the instruction.
Mode 6: extremely heavy load and grid fault
According to the illumination condition and the wind power condition in the current mode, the photovoltaic interface, the wind power interface, the energy storage interface and the other energy router interface are not enough to meet the load requirement by generating power at rated power at the same time. And the grid is unable to provide energy due to a fault. Namely:
Pload>(PPV+Pwind+PES+PER)，
at this time, the photovoltaic interface, the wind power generation interface and the energy storage interface can be set to work in a maximum power generation mode, the other energy router interfaces can be set to prompt other accessible energy routers to be accessed, the other energy routers can work in a constant voltage mode, and then the load is cut off as required according to the importance degree of the load. And selecting the working mode according to the load condition after the load is cut off. It can be understood that, cutting off the load according to the importance degree of the load as appropriate means that the load with the lowest importance degree is cut off (the specific cutting-off operation is realized by controlling the corresponding load converter and the controller to turn off the corresponding interface through the central controller), and then the working modes of the photovoltaic interface, the wind power interface, the energy storage interface and the other energy router interfaces are determined according to the working mode determination method under the demand power generation working mode.
2. Maximum power generation working mode
In the working mode, the energy router generates electricity to the maximum extent. Because the primary power generation interfaces of the energy router are clean energy, the energy router can feed back to the power grid in the mode, and the maximum economic benefit can be obtained while the environment friendliness is ensured. There are 5 modes of operation, as shown in table 2.
TABLE 2 maximum Generation mode of operation
Mode 1: extremely light load
In the mode, the load power is smaller than the difference between the sum of the rated power of the photovoltaic interface and the rated power of the wind power interface and the rated charging power of the energy storage interface, namely:
Pload<(PPV+Pwind-PES)，
at the moment, the photovoltaic interface and the wind power interface simultaneously work in a maximum power generation mode. If the electric quantity of the storage battery is not full, the energy storage interface works in a maximum power charging state, otherwise, the storage battery is turned off. The "other energy router interface" prompts "accessible". The 'grid interface' operates in a constant voltage mode while supplying power to the grid.
Mode 2: the load is light
Under the mode, the load power is less than the sum of the rated power of the photovoltaic interface, the rated power of the wind power interface and the rated discharge power of the energy storage interface, and is higher than the difference between the sum of the rated power of the photovoltaic interface and the rated power of the wind power interface and the rated charge power of the energy storage interface, namely:
(PPV+Pwind-PES)<Pload<(PPV+Pwind+PES)，
at the moment, the photovoltaic interface and the wind power interface simultaneously work in a maximum power generation mode. The "energy storage interface" operates in a constant voltage mode (charge or discharge). The "other energy router interface" is switched off from the "grid interface".
Mode 3: loaded heavier
In the mode, the load power is higher than the sum of the rated power of the photovoltaic interface, the rated power of the wind power interface and the discharge power of the energy storage interface, but is lower than the sum of the rated power of the photovoltaic interface, the rated power of the wind power interface, the discharge power of the energy storage interface and the rated power absorbed from other energy routers, namely:
(PPV+Pwind+PES)<Pload<(PPV+Pwind+PES+PER)，
at the moment, the photovoltaic interface, the wind power interface and the energy storage interface simultaneously work in a maximum power generation mode, and the interfaces of other energy routers are connected to other energy routers which prompt that the interfaces can be connected and work in a constant voltage mode. And (5) switching off the power grid interface.
Mode 4: the load is very heavy
In the mode, the load power is higher than the sum of the rated power of a photovoltaic interface, the rated power of a wind power interface, the discharge power of an energy storage interface and the rated power absorbed from other energy routers, namely:
Pload>(PPV+Pwind+PES+PER)，
at the moment, the photovoltaic interface, the wind power interface and the energy storage interface simultaneously work in a maximum power generation mode, the interfaces of other energy routers are connected to other energy routers which prompt that the interfaces can be connected and work in the maximum power generation mode, and the power grid interface works in a constant voltage mode to absorb electric energy from a power grid.
Mode 5: extremely heavy load and grid fault
In the mode, the load power is higher than the sum of the rated power of a photovoltaic interface, the rated power of a wind power interface, the discharge power of an energy storage interface and the rated power absorbed from other energy routers, namely:
Pload>(PPV+Pwind+PES+PER)，
because the power grid can not provide energy, the photovoltaic interface, the wind power generation interface and the energy storage interface can be set to work in a maximum power generation mode at the moment, the other energy router interfaces are set to prompt that other accessible energy routers can be accessed and work in a constant voltage mode, and then the load is cut off as appropriate according to the importance degree of the load. And selecting the working mode according to the load condition after the load is cut off.
The on-demand power generation working mode is suitable for systems such as island micro-grids and the like which mainly operate in an off-grid mode, and the cost in the aspects of energy storage, grid connection and the like is saved while the electric energy is self-sufficient; the maximum power generation mode is suitable for areas with sufficient clean energy such as light energy and wind energy, and can generate electric energy to the maximum extent and feed the electric energy back to a power grid, so that economic benefits are maximized. When the energy router is used, the working mode is selected according to the actual situation, the central controller (top layer) determines the controller (bottom layer) working mode of each interface according to the working mode selection instruction and the load power information acquired from the load interface, so that power generation or shutdown is realized, and the autonomous control of the energy router is realized.
The energy router architecture accords with the concept of 'interconnection' of energy internets and plays an important role in the energy internets. Compared with the traditional direct current micro-grid structure, the energy router has the advantages of more complex structure, more comprehensive functions, higher system integration level and more user-friendly performance.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (6)
1. An energy router, comprising:
the system comprises a photovoltaic converter and controller, an energy storage converter and controller, a wind power converter and controller, an energy router converter and controller, a power grid converter and controller, a direct current load converter and controller and an alternating current load converter and controller; wherein the content of the first and second substances,
the inner side positive electrodes of the photovoltaic converter and the controller are connected with the inner side positive electrodes of the power grid converter and the controller through a direct current bus, the inner side negative electrodes of the photovoltaic converter and the controller are connected with the inner side negative electrodes of the power grid converter and the controller through a direct current bus, a first node is connected with the direct current bus connected between the inner side positive electrodes of the photovoltaic converter and the controller and the inner side positive electrodes of the power grid converter and the controller, the inner side positive electrodes of the energy storage converter and the controller, a second node and the inner side positive electrodes of the direct current load converter and the controller, the second node is connected with the inner side positive electrodes of the wind power converter and the controller, the inner side positive electrodes of the energy router converter and the controller and the inner side positive electrodes of the alternating current load converter and the controller, and a third node is connected with the inner side negative electrodes of the energy storage converter and the controller, The direct current bus and the fourth node which are connected between the negative electrodes at the inner sides of the photovoltaic converter and the controller and the negative electrodes at the inner sides of the power grid converter and the controller, and the negative electrodes at the inner sides of the direct current load converter and the controller, the fourth node is connected with the negative electrodes at the inner sides of the wind power converter and the controller, the negative electrode at the inner side of the energy router converter and the controller and the negative electrode at the inner side of the alternating current load converter and the controller,
the photovoltaic converter and the outer side interface of the controller are connected with the photovoltaic array and are used for realizing constant voltage control and maximum power control of the power generation of the photovoltaic array; the energy storage converter and the outer side interface of the controller are connected with a storage battery and are used for realizing constant voltage charge and discharge control and maximum power charge and discharge control of the storage battery; the wind power converter and the outer side interface of the controller are connected with a wind power generator and are used for realizing constant voltage control and maximum power control of the power generation of the wind power generator; the energy router converter and the outer side interface of the controller are connected with other energy routers, and the energy router converter is used for outputting bus voltage to the other energy routers to supply energy to the other energy routers, or the other energy routers are used as power supplies to obtain electric energy from the other energy routers; the power grid converter is connected with the outer side interface of the controller through a power grid and used for realizing grid-connected power control; the direct current load converter and the outer side interface of the controller are connected with a direct current load, and the direct current load converter and the outer side interface of the controller are used for performing DCDC conversion on direct current bus voltage and outputting the direct current bus voltage to the direct current load, and controlling the connection and disconnection of an interface used for connecting the direct current load; the AC load converter and the outer side interface of the controller are connected with an AC load, and are used for performing DCAC conversion on a DC bus voltage and outputting the DC bus voltage to the AC load, and controlling the on-off of an interface used for connecting the AC load;
the energy router comprises two working modes of generating power according to requirements and generating power to the maximum extent.
2. The energy router of claim 1, wherein the energy router converter and controller external interface is provided with an 'accessible' indicator light, and the indicator light is turned on to connect with the other energy router so as to supply energy to the other energy router.
3. The energy router of claim 2, wherein the dc load converter and controller external interface and the ac load converter and controller external interface are each provided with a detection device, and the detection devices are used for detecting the magnitude of the dc load or the ac load in real time.
4. A power generation control method based on the energy router according to any one of claims 1 to 3, characterized by comprising:
after receiving a power generation working mode instruction input by a user, a central controller acquires rated power of a photovoltaic interface, an energy storage interface, a wind power generation interface and other energy router interfaces, load power of an energy router and operation conditions of a power grid, wherein the power generation working mode instruction comprises a power generation working mode instruction according to needs and a maximum power generation working mode instruction, and the central controller is connected with the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller, the power grid converter and controller, the direct current load converter and controller and the alternating current load converter and controller;
the central controller determines the working modes of the photovoltaic interface, the energy storage interface, the wind power generation interface, the other energy router interfaces and the power grid interface according to the rated power of the photovoltaic interface, the energy storage interface, the wind power generation interface and the other energy router interfaces, the load power of the energy router and the running condition of the power grid, and issues corresponding working mode instructions to the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller, the power grid converter and controller, so that the photovoltaic converter and controller, the energy storage converter and controller, the wind power converter and controller, the energy router converter and controller, the power grid converter and controller carry out conversion on the photovoltaic interface, the energy storage interface, the wind power generation interface and the power grid interface according to the corresponding working mode instructions, And correspondingly adjusting the working modes of the wind power generation interface, the other energy router interfaces and the power grid interface.
5. The method according to claim 4, wherein if the power generation mode command is a demand power generation mode command, the central controller determines the operating modes of the photovoltaic interface, the energy storage interface, the wind power generation interface, the other energy router interfaces and the grid interface according to the rated powers of the photovoltaic interface, the energy storage interface, the wind power generation interface and the other energy router interfaces, the load power of the energy router and the operating conditions of the grid, and includes:
if the judgment result shows that the load power of the energy router is lower than the rated power of the photovoltaic interface and the rated power of the wind power generation interface, determining that the photovoltaic interface and the wind power generation interface with the higher rated power work in a constant voltage mode, the wind power generation interface with the lower rated power is turned off, the energy storage interface and the power grid interface are turned off, and the other energy router interfaces prompt that other energy routers can be accessed to supply energy for the other energy routers; or
If the judgment result shows that the load power of the energy router is higher than the larger of the rated power of the photovoltaic interface and the rated power of the wind power generation interface and lower than the sum of the rated power of the photovoltaic interface and the rated power of the wind power generation interface, determining that the larger of the rated power of the photovoltaic interface and the wind power generation interface works in a constant voltage mode, the smaller of the rated power of the photovoltaic interface and the wind power generation interface works in a maximum power generation mode, the energy storage interface and the power grid interface are switched off, and the other energy router interfaces prompt that other energy routers can be accessed to supply energy to the other energy routers; or
If the judgment result shows that the load power of the energy router is higher than the sum of the rated power of the photovoltaic interface and the rated power of the wind power generation interface and is lower than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface and the rated discharge power of the energy storage interface, it is determined that the photovoltaic interface and the wind power generation interface work in a maximum power generation mode, the energy storage interface works in a constant voltage mode, and the power grid interface and other energy router interfaces are turned off; or
If the load power of the energy router is judged and obtained to be higher than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface and the rated discharge power of the energy storage interface and lower than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface, the rated power of the energy storage interface and the rated power of other energy router interfaces, it is determined that the photovoltaic interface, the wind power generation interface and the energy storage interface work in a maximum power generation mode, the power grid interface is turned off, and the other energy router interfaces prompt other energy routers which can be accessed and work in a constant voltage mode; or
If the load power of the energy router is judged to be higher than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface, the rated discharge power of the energy storage interface and the rated power of the other energy router interfaces, and the power grid works normally, it is determined that the photovoltaic interface, the wind power generation interface and the energy storage interface work in a maximum power generation mode, the other energy router interfaces prompt other accessible energy routers and work in the maximum power generation mode, and the power grid interface works in a constant voltage mode; or
If the judgment shows that the load power of the energy router is higher than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface, the rated discharge power of the energy storage interface and the rated power of other energy router interfaces, and the power grid fails, the photovoltaic interface, the wind power generation interface and the energy storage interface are determined to work in a maximum power generation mode, the other energy router interfaces prompt other accessible energy routers to work in a constant voltage mode, the load is cut off according to the importance degree of the load, and the working modes of the photovoltaic interface, the energy storage interface, the wind power generation interface and the other energy router interfaces are determined according to the load condition after the load is cut off.
6. The method according to claim 4, wherein if the power generation operation mode command is a maximum power generation operation mode command, the central controller determines the operation modes of the photovoltaic interface, the energy storage interface, the wind power generation interface, the other energy router interfaces and the grid interface according to the rated powers of the photovoltaic interface, the energy storage interface, the wind power generation interface and the other energy router interfaces, the load power of the energy router and the operation condition of the grid, and the method comprises the following steps:
if the load power of the energy router is judged and obtained to be lower than the difference between the sum of the rated power of the photovoltaic interface and the rated power of the wind power generation interface and the rated charging power of the energy storage interface, and the electric quantity of the storage battery is not full, it is determined that the photovoltaic interface and the wind power generation interface work in a maximum power generation mode, the energy storage interface works in a maximum power charging state, the power grid interface works in a constant voltage mode and simultaneously supplies power to the power grid, and the interfaces of other energy routers prompt that other energy routers can be accessed to supply power to the other energy routers; or
If the load power of the energy router is judged and obtained to be lower than the difference between the sum of the rated power of the photovoltaic interface and the rated power of the wind power generation interface and the rated charging power of the energy storage interface, and the electric quantity of the storage battery is full, it is determined that the photovoltaic interface and the wind power generation interface work in a maximum power generation mode, the energy storage interface is turned off, the power grid interface works in a constant voltage mode and supplies power to the power grid, and the interfaces of other energy routers prompt that other energy routers can be accessed to supply power to the other energy routers; or
If the difference between the load power of the energy router, which is higher than the sum of the rated power of the photovoltaic interface and the rated power of the wind power generation interface, and the rated charging power of the energy storage interface and is lower than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface and the rated discharging power of the energy storage interface is obtained through judgment, it is determined that the photovoltaic interface and the wind power generation interface work in a maximum power generation mode, the energy storage interface works in a constant voltage mode, and the power grid interface and other energy router interfaces are turned off; or
If the load power of the energy router is judged and obtained to be higher than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface and the rated discharge power of the energy storage interface and lower than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface, the rated discharge power of the energy storage interface and the rated power of other energy router interfaces, it is determined that the photovoltaic interface, the wind power generation interface and the energy storage interface work in a maximum power generation mode, the power grid interface is turned off, and the other energy router interfaces prompt other energy routers which can be accessed and work in a constant voltage mode; or
If the load power of the energy router is judged to be higher than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface, the rated discharge power of the energy storage interface and the rated power of the other energy router interfaces, and the power grid works normally, it is determined that the photovoltaic interface, the wind power generation interface and the energy storage interface work in a maximum power generation mode, the other energy router interfaces prompt other accessible energy routers and work in the maximum power generation mode, and the power grid interface works in a constant voltage mode to absorb electric energy from the power grid; or
If the judgment shows that the load power of the energy router is higher than the sum of the rated power of the photovoltaic interface, the rated power of the wind power generation interface, the rated discharge power of the energy storage interface and the rated power of other energy router interfaces, and the power grid fails, the photovoltaic interface, the wind power generation interface and the energy storage interface are determined to work in a maximum power generation mode, the other energy router interfaces prompt other accessible energy routers to work in a constant voltage mode, the load is cut off according to the importance degree of the load, and the working modes of the photovoltaic interface, the energy storage interface, the wind power generation interface and the other energy router interfaces are determined according to the load condition after the load is cut off.
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| CN111509834A (en) * | 2020-05-20 | 2020-08-07 | 广东电网有限责任公司 | Comprehensive energy alternating current-direct current dual-power supply system |
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