Systems and methods for overload control in renewable power systems

Abstract

A renewable power system is provided. The renewable power system includes a plurality of power generation devices and a plurality of power converters. Each power converter of the plurality of power converters is electrically coupled to at least one power generating device of the plurality of power generating devices and a load. The renewable power system further includes a plurality of controllers. Each controller of the plurality of controllers includes a processor communicatively coupled with at least one power converter of the plurality of power converters. The processor is configured to detect a load power of the load; determining available power of the plurality of power generation devices; and in response to the load exceeding the available power of the plurality of power generation devices, adjusting at least one parameter of the at least one power converter.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of priority to U.S. patent application serial number 17 / 870,472, filed on July 21, 2022, and entitled “SYSTEM AND METHOD FOR OVERLOAD CONTROL IN A RENEWABLE POWER SYSTEM,” the contents and disclosure of which are hereby incorporated in their entirety. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT

[0002] This invention was made with government support under Contract No. DE-EE0009024 awarded by the U.S. Department of Energy. The government has certain rights in this invention. Background Art

[0003] The field of the invention relates generally to control systems for power generation facilities, and more particularly, to overload control in renewable power generation facilities.

[0004] In certain renewable power systems, a power grid may be formed by renewable power sources (e.g., photovoltaic (PV) sources, wind sources, and / or batteries) and power converters that convert the renewable power provided by these sources into power suitable for supply to the grid, which in turn may be used to supply power to loads. Because the grid may not include conventional power sources in addition to the renewable sources, in order to achieve stability of the grid, these power converters must achieve generation and load balancing to ensure that the power supplied by the renewable sources meets the power requirements of the loads. If the power demand of the load exceeds the power generation capability of the renewable source, the power converter may enter an unstable state, resulting in a loss of power at the load. For example, in such an overload condition, the PV source may experience a voltage collapse. Therefore, a renewable power system with overload control for improving stability under overload conditions is desired. Summary of the invention

[0005] In one aspect, a renewable power system is provided. The renewable power system includes a plurality of power generation devices and a plurality of power converters. Each of the plurality of power converters is electrically coupled to at least one of the plurality of power generation devices and at least one of a load and / or a main grid. The renewable power system further includes a plurality of controllers. Each of the plurality of controllers includes a processor communicatively coupled to at least one of the plurality of power converters. The processor is configured to detect the load power of at least one of the load and / or the main grid; determine the available power of the plurality of power generation devices; and in response to the load power exceeding the available power of the plurality of power generation devices, adjust at least one parameter of the at least one power converter.

[0006] On the other hand, a method for controlling a renewable power system is provided. The renewable power system includes a plurality of power generation devices and a plurality of power converters. Each of the plurality of power converters is electrically coupled to at least one of the plurality of power generation devices and at least one of a load and / or a main grid. The renewable power system further includes a plurality of controllers. Each of the plurality of controllers includes a processor communicatively coupled to at least one of the plurality of power converters. The method includes detecting, by the processor, a load power of at least one of the load and / or the main grid. The method further includes determining, by the processor, an available power of a plurality of power generation devices. The method further includes adjusting, by the processor, at least one parameter of the at least one power converter in response to the load power exceeding the available power of the plurality of power generation devices.

[0007] In another aspect, a controller for a power converter is provided. The power converter is electrically coupled to at least one of a plurality of power generating devices and at least one of a load and / or a main grid. The controller includes a processor communicatively coupled to the power converter. The processor is configured to detect a load power of the at least one of the load and / or the main grid; determine an available power of the plurality of power generating devices; and in response to the load power exceeding the available power of the plurality of power generating devices, adjust at least one parameter of the power converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] These and other features, aspects and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings, wherein like reference numerals refer to like parts throughout the drawings, and wherein:

[0009] Figure 1 is a simplified diagram of an example renewable power system.

[0010] Figure 2 It is for Figure 1 A simplified diagram of an example overload controller for use within a renewable power system is shown in FIG.

[0011] Figure 3A is a graph showing the relationship between power and voltage of a power converter during an overload condition.

[0012] Figure 3B is a graph showing the relationship between power and voltage of a power converter during an overload condition with overload control applied.

[0013] Figure 4 is a simplified diagram of another example renewable power system.

[0014] Figure 5 is a flow chart of an example method for controlling a renewable power system.

[0015] Figure 6 is a flow chart of another example method for controlling a renewable power system. DETAILED DESCRIPTION

[0016] In the following specification and claims, reference will be made to a number of terms which will be defined to have the following meanings.

[0017] The singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise.

[0018] Approximate language as used throughout the specification and claims herein may be applied to modify any quantitative representation, which may allow for variation without causing a change in the basic function associated therewith. Therefore, the value modified by one or more terms (e.g., "approximately," "substantially," and "approximately") is not limited to the exact value specified. In at least some instances, approximate language may correspond to the precision of the instrument used to measure the value. Here and throughout the specification and claims, range limitations may be combined and / or interchanged, such ranges being identified and including all subranges contained therein, unless otherwise indicated by context or language.

[0019] Embodiments of the present disclosure include a renewable power system. The renewable power system includes a plurality of power generation devices (sometimes referred to herein as "renewable power sources"). The renewable power system also includes a plurality of power converters (e.g., inverters and / or other types of power converters). Each of the plurality of power converters is electrically coupled to at least one of the power generation devices via a unit transformer and is electrically coupled to a power grid and / or a load. The renewable power system also includes a plurality of controllers, each controller including a processor coupled to at least one of the power converters in communication. The processor is configured to detect the load power of the power grid and / or the load, determine the available power of the plurality of power generation devices, and enable the power converter to work independently or automatically in parallel with the plurality of power converters through certain mechanisms (e.g., a drop characteristic) to meet the load demand. In response to the load power exceeding the available power of the plurality of power generation devices (i.e., there is an overload condition), the processor adjusts the voltage of at least one power converter to increase the available power and / or increase the stability of the system. In some embodiments, other output parameters of the power converter may be adjusted, such as, for example, frequency and / or phase angle.

[0020] In some embodiments, the power converters can communicate via a communication network (e.g., a distributed communication network), for example, to share information about power generation availability, coordinate power output to a grid, coordinate the transfer of power generation between renewable sources, and / or share other information.

[0021] Figure 1 An example renewable power system 100 is shown. The renewable power system 100 includes a plurality of renewable power sources 102, a plurality of power converters 104, a plurality of overload controllers 106, a plurality of unit transformers 108, and a load 110, which together form an island 112. The load 110 may be a single load or a plurality of loads dispersed within the island 112. In some embodiments, the renewable power system 100 further includes a main grid 114 and an island switch 116, by which the island 112 and the main grid 114 may be electrically coupled and decoupled.

[0022] The renewable power sources 102 include, for example, photovoltaic (PV) sources 118, wind sources 120, and / or battery sources 122, each of which can generate, reserve, and / or store power that can be supplied to the loads 110 and / or the main grid 114 via the island grid 112. Each renewable power source 102 is electrically coupled to the load 110 via one of the power converters 104 and one of the unit transformers 108, which together are configured to convert the power generated by the renewable power source 102 into a type (e.g., voltage and frequency) suitable for the load 110 and / or the main grid 114.

[0023] Each power converter 104 is communicatively coupled to one of the overload controllers 106, one of which forms part of the converter controller. The overload controllers 106 are configured to detect a condition of the island grid 112 in which the power generated by the renewable power source 102 is less than the power required by the load 110 and / or the grid 114, sometimes referred to herein as an "overload condition." In response to determining that an overload condition exists, as described in further detail below, the overload controllers 106 are configured to control the corresponding power converter 104 to reduce grid instability that may result from the overload condition.

[0024] To determine if an overload condition exists, overload controller 106 is configured to detect load power of island power grid 112 and / or power grid 114 and determine the available power of renewable power source 102. Each overload controller 106 may communicate with a corresponding power converter 104 and with one or more other overload controllers 106 to determine the total available power. Figure 1As shown in , in some embodiments, certain overload controllers 106 may communicate directly with other overload controllers 106 via a distributed communication network. In some such embodiments, the distributed communication network may be "sparse" in that any one overload controller may be directly connected to relatively few other overload controllers 106 while still being at least indirectly (e.g., through one or more other overload controllers 106) connected to each other overload controller 106 in the network. Within the distributed network, one or more overload controllers 106 may be linked using any suitable wired or wireless communication mechanism to transmit data therebetween. Additionally or alternatively, the overload controllers 106 may communicate via a centralized network, for example, through a common network node, which may be implemented as a renewable power plant control device.

[0025] The overload controller 106 is also configured to adjust the command of the power converter 104 based on the power difference in response to the load power exceeding the available power of the renewable power source 102. For example, an overload controller 106 can adjust the frequency reference of the corresponding power converter 104 by a selected amount determined by some mechanism (e.g., a droop characteristic), which can increase the power output of the power converter 104. Similarly, in some embodiments, the overload controller 106 is configured to adjust the voltage amplitude of the power converter 104 by an amount determined by some mechanism (e.g., a droop characteristic) in response to the existence of an overload condition to reduce the load power demand of certain load types. Those skilled in the art will recognize that there may be alternatives that achieve the same goal that are different from the alternatives described herein. For example, in some cases, adjusting only the frequency can increase the output power to balance the power demand, and in some cases, both the frequency and the voltage amplitude need to be adjusted to achieve power balance.

[0026] In some embodiments, in response to an overload condition, the overload controller 106 utilizes a dynamic boundary limit function to ensure the availability of renewable resource power. The overload controller 106 may determine or estimate the available power in real time, for example, based on measurement data. Using the dynamic boundary limit function, the overload controller 106 can determine a range of operating points for safe operation, such as a PV voltage. Based on the determined range, the overload controller 106 is configured to determine the operating point of the power converter 104 using an overload control function. For example, the overload controller 106 can select a voltage, frequency, phase angle, and / or other parameters under which the operation of the power converter 104 will increase and / or optimize the output power without causing voltage collapse or other undesirable conditions. These parameters can be defined at least in part as incremental values ​​relative to a reference value. Examples may include (i) generating a frequency increment (i.e., a specified change in frequency) based on power balance, (ii) generating a phase angle increment based on power balance, (iii) generating a voltage magnitude increment based on power balance, (iv) generating a voltage, frequency, and / or phase angle increment based on the magnitude and / or phase angle of current output by power converter 104, and / or (v) generating a voltage magnitude, frequency, and / or phase angle increment based on load information (e.g., feedback from island grid 112). In some embodiments, such increment values ​​must fall within a certain predefined range (e.g., a range within which power converter 104 can operate stably and / or renewable power system 100 can meet grid regulation requirements).

[0027] In some embodiments, the overload controller 106 is further configured to determine set points and / or control parameters for the corresponding power converter 104 based on the available power of each of the plurality of power generating devices, which enables power generation to be shifted, for example, from a renewable power source 102 having less available power to a renewable power source having more available power. By shifting power generation in this way, the overload controller 106 can further stabilize the island 112 during an overload condition by reducing the overload on any given power converter 104. The shifting of power generation can be coordinated by communication of the overload controllers via any of the communication networks described above.

[0028] Figure 2 is a simplified diagram of an example overload controller 106. The overload controller 106 includes a smart PV reserve 202, a power tracking module 204, a PV dynamic boundary limit model 206, a virtual synchronous generator (VSG) control module 208, an overload control module 210, a multi-inverter coordination module 212, a transient control module 214, a load information module 216, a modulator 218, a protection module 220, and a Q / V control module 222, any of which may be implemented using hardware, software, and / or a combination thereof.

[0029] The smart PV reserve 202 and the power tracking module are configured to determine the power output of the renewable power source 102 based on, for example, the voltage, current, and / or other detected parameters of the renewable power source 102. In some embodiments, the overload controller 106 includes a sensor for determining the voltage, current, and / or other parameters of the renewable power source 102 and / or is communicatively coupled thereto.

[0030] The PV dynamic boundary limit model 206 is configured to determine a safe operating voltage range based on the boundary limit function and the determined power output of the renewable power source 102 , which the overload controller 106 may use to determine operating parameters of the power converter 104 .

[0031] VSG control module 208 is configured to determine a frequency adjustment for controlling power converter 104 based on the determined power output of renewable power source 102. As described in further detail below, the frequency adjustment determined by VSG control module 208 may be further adjusted to account for overload conditions and / or other conditions.

[0032] The Q / V control module 222 is configured to determine the amplitude control of the output voltage. In some embodiments, based on different applications, the Q / V control module 222 can be configured in Q mode, V mode or droop mode.

[0033] Overload control module 210 is configured to determine a voltage, frequency, and other parameters for operating power converter 104 based on a determination that an overload condition exists and the determined power output of renewable power source 102. Overload control module 210 may determine that an overload condition exists based on information obtained from load information module 216, which is configured to obtain information about load 110 and / or a power grid.

[0034] The modulator 218 is configured to generate a control signal (e.g., a pulse width modulation (PWM) signal) for the power converter 104 based on information received from the VSG control module 208, the overload control module 210, and / or the Q / V control module 222. In some embodiments, the modulator 218 may further receive information and generate a control signal based on information received from the multi-inverter coordination module 212 (e.g., control states of other power converters 104 and / or overload controller 106) and / or information received from the transient control module 214 (e.g., to account for other transient factors). The protection module 220 is configured to trigger inverter protection (e.g., by disabling the power converter 104) if any detected parameter exceeds a range and / or threshold for safe operation.

[0035] Figure 3A A graph 300 is depicted, and Figure 3BAnother graph 302 is shown. Graphs 300 and 302 each represent a PV source 118 ( Figure 1 ), wherein graph 300 represents power and voltage during a voltage collapse event, and graph 302 shows the power-voltage relationship at one of the voltage collapse events. Figure 1 and Figure 2 The power and voltage during overload control by the overload controller 106 are shown. Both cases assume that the PV inverter is operating in a power reserve mode (i.e., not at a maximum power point) before the overload occurs. The graphs 300 and 302 each include a horizontal axis 304 and a vertical axis 306, wherein the horizontal axis 304 represents the direct current (DC) bus voltage expressed in volts and the vertical axis 306 represents the power expressed in megawatts.

[0036] Graph 300 includes a power-voltage curve 308. Without overload control, the inverter controller will continue to draw more power to balance the load and generate power, as shown by the power-voltage curve 308. Due to the nonlinear power-voltage characteristics of the PV source, this may cause the DC bus voltage to collapse, which may cause system instability and exacerbate the overall system overload condition.

[0037] The graph 302 includes a power-voltage curve 310 corresponding to the use of Figure 1 and Figure 2 Overload control as described above. By adjusting the AC side voltage frequency and amplitude together with the DC side dynamic boundary limitation, the overload control can still maintain a certain level of power output. Although the operating point may still not meet the load power demand, at least it can avoid voltage collapse and put a specific renewable source into suboptimal operation, thereby contributing to overall system stability and enabling other resources in the island 112 to share the load.

[0038] Figure 4 An example renewable power system 400 is shown, which is generally described with respect to Figure 1 106. In addition to the components described with respect to renewable power system 100, renewable power system 400 also includes a plant controller 402. Plant controller 402 is communicatively coupled to each overload controller 106 and may facilitate a centralized communication network between overload controllers 106. In some embodiments, some of the functions described with respect to overload controllers 106 may be performed by plant controller 402.

[0039] Figure 51 is a flow chart illustrating an example method 500 for controlling a renewable power system (e.g., renewable power system 100) including a plurality of power generation devices (e.g., renewable power sources 102), a plurality of power converters (e.g., power converter 104), and a plurality of controllers (e.g., overload controller 106). Each power converter is electrically coupled to at least one of the plurality of power generation devices and a load (e.g., load 110) and / or a power grid (e.g., main grid 114), and each controller includes a processor communicatively coupled to at least one of the plurality of power converters.

[0040] Method 500 includes detecting 502 power of a load and / or a main grid.

[0041] Method 500 also includes determining 504 available power of the plurality of power generating devices.

[0042] Method 500 also includes, in response to the load power exceeding available power of the plurality of power generating devices, adjusting 506 at least one parameter of at least one power converter.

[0043] In some embodiments, the renewable power system further comprises a distributed communication network, wherein the plurality of controllers are configured to communicate via the distributed communication network. In some such embodiments, the distributed communication network comprises a sparse communication network.

[0044] In some embodiments, method 500 further includes adjusting at least one parameter based on non-communication means, such as a droop characteristic, to coordinate the plurality of power converters.

[0045] In some embodiments, method 500 further includes, in response to the load power exceeding the available power of the plurality of power generating devices, adjusting one or more of a frequency reference and / or a voltage amplitude of the at least one power converter.

[0046] In some embodiments, method 500 also includes determining a set point based on available power for each of the plurality of power generating devices.

[0047] In some embodiments, method 500 further includes determining a coefficient of power sharing based on available power of each of the plurality of power generating devices.

[0048] In some embodiments, the renewable power system further includes an island switch (eg, island switch 116 ) configured to selectively couple and decouple the island grid from the main grid.

[0049] In some embodiments, the renewable power system further includes a plurality of cell transformers (eg, cell transformer 108 ), wherein each power converter of the plurality of power converters is coupled to the island grid via one of the plurality of cell transformers.

[0050] In some embodiments, the plurality of power generating devices includes one or more of a photovoltaic (PV) source (eg, PV source 118 ), a wind source (eg, wind source 120 ), and a battery source (eg, battery source 122 ).

[0051] In some embodiments, the plurality of power converters includes at least one inverter.

[0052] In some embodiments, method 500 also includes determining a power set point based on available power for each of the plurality of power generating devices.

[0053] Figure 6 6 is a flow chart illustrating an example method 600 for controlling a renewable power system (e.g., renewable power system 100). Method 600 includes operating 602 the renewable power system, detecting 604 system load power, and determining available power of a plurality of power generating devices (e.g., renewable power sources 102) of the renewable power system. Method 600 also includes determining 608 that an overload condition exists. Method 600 also includes, if an overload condition exists, adjusting 610 at least one parameter of at least one power converter (e.g., power converter 104) of the renewable power system and coordinating 612 a plurality of inverters (e.g., inverters of power converter 104) of the renewable power system. Method 600 also includes determining 614 that a parameter of the renewable power system is outside a range of safe operation and / or fails to meet a required standard, and if so, triggering 616 converter protection and / or system protection (e.g., by disabling power converter 104).

[0054] Example technical effects of the methods, systems, and apparatus described herein include at least one of the following: (a) increasing output power during an overload condition in a renewable power system by releasing reserve power in multiple power generation sources; (b) increasing system stability during an overload condition in a renewable power system by avoiding a collapse of a DC bus voltage of multiple inverters; (c) increasing system stability during an overload condition in a renewable power system by shifting power generation within the renewable power system to a renewable source with greater available power generation; (d) increasing system stability during an overload condition in a renewable power system by adjusting power set points and coefficients for power sharing in at least one power generation source; and (e) coordinating the operation of power converters within a renewable power system during an overload condition using one or more of a distributed and / or centralized communication system.

[0055] Example embodiments of renewable power systems are provided herein. Systems and methods for operating and manufacturing such systems and devices are not limited to the specific embodiments described herein, but rather, components of the systems and / or steps of the methods may be utilized independently and separately from other components and / or steps described herein. For example, the methods may also be used in conjunction with other electronic systems and are not limited to being practiced with only the electronic systems and methods as described herein. Rather, the example embodiments may be implemented and utilized in conjunction with many other electronic systems.

[0056] Some embodiments relate to the use of one or more electronic or computing devices. Such a device typically includes a processor, a processing device or a controller, such as a general-purpose central processing unit (CPU), a graphics processing unit (GPU), a microcontroller, a reduced instruction set computer (RISC) processor, an application-specific integrated circuit (ASIC), a programmable logic circuit (PLC), a field programmable gate array (FPGA), a digital signal processing (DSP) device and / or any other circuit or processing device capable of performing the functions described herein. The methods described herein may be encoded as executable instructions embodied in a computer-readable medium, which includes but is not limited to a storage device and / or a memory device. When executed by a processing device, such instructions cause the processing device to perform at least a portion of the method described herein. The above embodiments are examples only, and are therefore not intended to limit the definition and / or meaning of the terms "processor" and "processing device" in any way.

[0057] Although specific features of various embodiments of the present disclosure may be shown in some drawings and not in other drawings, this is only for convenience. According to the principles of the present disclosure, any feature of the drawings may be referenced and / or claimed in combination with any feature of any other drawings.

[0058] This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any device or system and performing any incorporated method. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. These other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements that do not differ substantially from the literal language of the claims.

Claims

1. A renewable power system comprising: a plurality of power generating devices; a plurality of power converters, each power converter of the plurality of power converters being electrically coupled to at least one power generation device of the plurality of power generation devices and to at least one of a load and / or a main grid; as well as a plurality of controllers, each of the plurality of controllers comprising a processor communicatively coupled to at least one power converter of the plurality of power converters, the processor configured to: detecting a load power of at least one of the load and / or the main power grid; determining available power of the plurality of power generating devices; as well as In response to the load power exceeding the available power of the plurality of power generating devices, at least one parameter of the at least one power converter is adjusted.

2. The renewable power system of claim 1, further comprising a distributed communication network, wherein: The plurality of controllers are configured to communicate via the distributed communication network.

3. The renewable power system according to claim 1, wherein: The processor of each controller of the plurality of controllers is configured to adjust the at least one parameter based on non-communication means to coordinate the plurality of power converters.

4. The renewable power system according to claim 1, wherein: In response to the load power exceeding the available power of the plurality of power generating devices, the processor is further configured to adjust one or more of a frequency reference and / or a voltage amplitude of the at least one power converter. 5 . The renewable power system of claim 1 , further comprising an island switch configured to selectively couple and decouple an island grid from the main grid.

6. The renewable power system according to claim 1, further comprising a plurality of unit transformers, wherein: Each power converter of the plurality of power converters is coupled to the island grid via a unit transformer of the plurality of unit transformers.

7. The renewable power system according to claim 1, wherein: Each of the plurality of power generation devices includes one or more of a photovoltaic (PV) source, a wind source, and a battery source.

8. The renewable power system according to claim 1, wherein: The plurality of power converters includes at least one inverter.

9. The renewable power system according to claim 1, wherein: The processor of each controller of the plurality of controllers is further configured to determine a power set point based on the available power of each power generating device of the plurality of power generating devices.

10. A method for controlling a renewable power system, the renewable power system comprising a plurality of power generating devices; a plurality of power converters, each power converter of the plurality of power converters being electrically coupled to at least one power generation device of the plurality of power generation devices and to at least one of a load and / or a main grid; and a plurality of controllers, each of the plurality of controllers comprising a processor communicatively coupled to at least one power converter of the plurality of power converters, the method comprising: detecting, by the processor, a load power of the at least one of the load and / or the main power grid; determining, by the processor, available power of a plurality of power generating devices; and In response to the load power exceeding the available power of the plurality of power generating devices, at least one parameter of the at least one power converter is adjusted by the processor.

11. The method of claim 10, further comprising, in response to the load power exceeding the available power of the plurality of power generating devices, adjusting, by the processor, a frequency reference and / or a voltage amplitude of the at least one power converter. 12 . The method of claim 10 , further comprising determining, by the processor, a power set point based on available power of each of the plurality of power generating devices. 13 . The method of claim 10 , further comprising determining, by the processor, a coefficient of power sharing based on the available power of each of the plurality of power generating devices.

14. A controller for a power converter, the power converter being electrically coupled to at least one of a plurality of power generation devices and at least one of a load and / or a main grid, the controller comprising a processor communicatively coupled to the power converter, the processor being configured to: detecting a load power of at least one of the load and / or the main power grid; determining available power of the plurality of power generating devices; and In response to the load power exceeding the available power of the plurality of power generating devices, at least one parameter of the power converter is adjusted.

15. The controller according to claim 14, wherein: The controller is coupled to a plurality of controllers via a distributed communication network.

16. The controller according to claim 14, wherein: The processor is configured to adjust the at least one parameter based on non-communication means.

17. The controller according to claim 14, wherein: In response to the load power exceeding the available power of the at least one power generating device, the processor is further configured to adjust one or more of a frequency reference and / or a voltage amplitude of the at least one power converter.

18. The controller according to claim 14, wherein: The at least one power generating device includes one or more of a photovoltaic (PV) source, a wind source, and a battery source.

19. The controller according to claim 14, wherein: The power converter includes an inverter.

20. The controller according to claim 14, wherein: The processor is further configured to determine at least one of a power set point and / or a factor of power sharing based on the available power of a plurality of power generating devices including the at least one power generating device electrically coupled to the power converter.

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