Control method of wind and light system, controller and wind power converter

Abstract

The invention provides a control method for a wind and light system, a controller and a wind power converter. The wind-solar system comprises a wind generating set and a photovoltaic system which are integrally designed. The control method comprises the steps that whether the wind-solar system comprises an energy storage system or not is determined; in response to determining that the wind and light system does not comprise the energy storage system, determining whether the power generation power of the wind generating set is between the cut-in power generation power of the wind generating set and the full power generation power of the wind generating set; responding to the power generation power of the wind generating set between the cut-in power generation power of the wind generating set and the full power generation power of the wind generating set according to the magnitude relationship between the sum of the power generation power of the wind generating set and the power generation power of the photovoltaic system and the full power generation power of the wind generating set; and controlling the actual power generation power of the wind generating set and the actual power generation power of the photovoltaic system.

Description

Control methods, controllers, and wind power converters for wind and solar power systems Technical Field

[0001] This application relates to the field of wind power, and more specifically, to a control method, controller, and wind power converter for wind and solar systems. Background Technology

[0002] In recent years, with the vigorous development of wind power and photovoltaics and the year-by-year increase in installed capacity, land resources in areas with high-quality wind and solar resources have become increasingly precious. Making full use of land resources has become an important path for the further development of new energy, and wind and solar power co-location has become an important way to make full use of land resources to develop new energy.

[0003] Currently, wind and solar co-location methods include two schemes: integrated construction of wind farms and photovoltaic power stations, and installation of photovoltaics on the wind turbine itself. The latter scheme typically involves mounting photovoltaics on the tower, with the photovoltaic system connected to the wind turbine's AC control cabinet or its own power system. Existing integrated photovoltaic and wind turbine construction schemes often involve installing conventional photovoltaic modules or flexible modules on the tower. Installing conventional modules on the tower requires higher structural requirements, a larger steel frame, and the photovoltaic modules are susceptible to shading from the tower, affecting power generation. Furthermore, installing flexible modules on the tower is more expensive, and the vertical installation of flexible modules results in less than optimal irradiance, impacting the wind turbine's power generation.

[0004] Regarding the control connection method, existing photovoltaic and wind turbine combination schemes mostly adopt AC connection schemes, which have certain losses in transformers and low voltage (400V / 690V), resulting in a large number of strings for the same installed capacity.

[0005] In addition, the power generation efficiency of existing wind and solar co-generation projects needs to be optimized and improved. Summary of the Invention

[0006] One of the purposes of this disclosure is to provide a control method that can improve the power generation efficiency of wind and solar systems.

[0007] According to one aspect of this disclosure, a control method for a wind-solar system is provided. The wind-solar system includes an integrated wind turbine generator and a photovoltaic system. The control method includes: determining whether the wind-solar system includes an energy storage system; in response to determining that the wind-solar system does not include an energy storage system, determining whether the power output of the wind turbine generator is between the cut-in power output of the wind turbine generator and the full power output of the wind turbine generator; in response to the power output of the wind turbine generator being between the cut-in power output of the wind turbine generator and the full power output of the wind turbine generator, controlling the actual power output of the wind turbine generator and the actual power output of the photovoltaic system based on the relationship between the sum of the power output of the wind turbine generator and the power output of the photovoltaic system and the full power output of the wind turbine generator.

[0008] Optionally, the step of controlling the actual power generation of the wind turbine and the photovoltaic system based on the relationship between the sum of the power generation capacity of the wind turbine and the photovoltaic system and the full power of the wind turbine may include: in response to the sum of the power generation capacity of the wind turbine and the photovoltaic system being less than or equal to the full power of the wind turbine, controlling the actual power generation capacity of the wind turbine to the power generation capacity of the wind turbine, and controlling the actual power generation capacity of the photovoltaic system to the power generation capacity of the photovoltaic system.

[0009] Optionally, based on the relationship between the sum of the power output of the wind turbine generator set and the power output of the photovoltaic system and the full power output of the wind turbine generator set, the step of controlling the actual power output of the wind turbine generator set and the actual power output of the photovoltaic system may further include: in response to the sum of the power output of the wind turbine generator set and the power output of the photovoltaic system being greater than the full power output of the wind turbine generator set, controlling the actual power output of the wind turbine generator set to the power output of the wind turbine generator set, and controlling the actual power output of the photovoltaic system to the difference between the full power output of the wind turbine generator set and the power output of the wind turbine generator set.

[0010] Optionally, in response to the wind turbine's generating capacity being greater than its full generating capacity, the actual generating capacity of the wind turbine can be controlled to the full generating capacity of the wind turbine, and the actual generating capacity of the photovoltaic system can be controlled to zero; in response to the wind turbine's generating capacity being less than its cut-in generating capacity, the actual generating capacity of the wind turbine can be controlled to zero, and the actual generating capacity of the photovoltaic system can be controlled to the photovoltaic system's generating capacity.

[0011] Optionally, in response to determining that the wind-solar system includes an energy storage system, it can determine whether the power output of the wind turbine is between the cut-in power output and the full power output of the wind turbine. In response to determining that the power output of the wind turbine is between the cut-in power output and the full power output of the wind turbine, the actual power output of the wind turbine, the actual power output of the photovoltaic system, and the charging and discharging power of the energy storage system can be controlled based on the relationship between the sum of the power output of the wind turbine, the power output of the photovoltaic system, and the maximum discharge power of the energy storage system and the full power output of the wind turbine.

[0012] Optionally, in response to the sum of the power output of the wind turbine generator set, the power output of the photovoltaic system, and the maximum discharge power of the energy storage system being less than or equal to the full power output of the wind turbine generator set, the actual power output of the wind turbine generator set can be controlled to the power output of the wind turbine generator set, the actual power output of the photovoltaic system can be controlled to the power output of the photovoltaic system, and the discharge power of the energy storage system can be controlled to the maximum discharge power of the energy storage system; in response to the sum of the power output of the wind turbine generator set, the power output of the photovoltaic system, and the maximum discharge power of the energy storage system being greater than the full power output of the wind turbine generator set, and the sum of the power output of the wind turbine generator set and the power output of the photovoltaic system being less than the full power output of the wind turbine generator set, the actual power output of the wind turbine generator set can be controlled to the power output of the wind turbine generator set, the actual power output of the photovoltaic system can be controlled to the power output of the photovoltaic system, and the discharge power of the energy storage system can be controlled to the difference between the full power output of the wind turbine generator set and the total power output of the wind turbine generator set and the photovoltaic system.

[0013] Optionally, in response to the fact that the sum of the power output of the wind turbine generator set, the power output of the photovoltaic system, and the maximum discharge power of the energy storage system is greater than the full power output of the wind turbine generator set, and the sum of the power output of the wind turbine generator set and the power output of the photovoltaic system is greater than the full power output of the wind turbine generator set but less than or equal to the sum of the full power output of the wind turbine generator set and the maximum chargeable power of the energy storage system, the actual power output of the wind turbine generator set is controlled to the power output of the wind turbine generator set, the actual power output of the photovoltaic system is controlled to the power output of the photovoltaic system, and the charging power of the energy storage system is controlled to the difference between the total power output of the wind turbine generator set and the photovoltaic system and the full power output of the wind turbine generator set.

[0014] Optionally, in response to the fact that the sum of the generating power of the wind turbine, the generating power of the photovoltaic system, and the maximum discharging power of the energy storage system is greater than the full power of the wind turbine, and the sum of the generating power of the wind turbine and the generating power of the photovoltaic system is greater than the full power of the wind turbine and the maximum charging power of the energy storage system, the actual generating power of the wind turbine is controlled to the generating power of the wind turbine, the charging power of the energy storage system is controlled to the maximum charging power of the energy storage system, and the generating power of the photovoltaic system is controlled to the difference between the sum of the full power of the wind turbine and the maximum charging power of the energy storage system and the generating power of the wind turbine.

[0015] Optionally, the photovoltaic system can be installed on the base of the wind turbine generator, and the photovoltaic modules of the photovoltaic system can be arranged in a fan shape around the tower of the wind turbine generator.

[0016] Optionally, the photovoltaic system can be DC connected to the DC bus at the front end of the converter of the wind turbine generator set.

[0017] According to a second aspect of this disclosure, a controller for a wind and solar system is provided. The controller includes a memory and a processor. The memory stores a program or instructions that, when executed by the processor, cause the processor to perform the control method described above.

[0018] According to a third aspect of this disclosure, a wind power converter is provided, the wind power converter including the aforementioned controller.

[0019] The control method for a wind-solar system according to embodiments of the present disclosure can reduce power generation losses in a wind-solar co-firing system. Attached Figure Description

[0020] Figure 1 is a flowchart illustrating a control method according to a first embodiment of the present disclosure.

[0021] Figure 2 is a flowchart illustrating a control method according to a second embodiment of the present disclosure.

[0022] Figure 3 is a top view schematic diagram illustrating the installation method of a photovoltaic module according to an embodiment of the present disclosure.

[0023] Figure 4 is a side view schematic diagram illustrating the installation method of a photovoltaic module according to an embodiment of the present disclosure.

[0024] Figure 5 is a schematic diagram illustrating a wind power system according to an embodiment of the present disclosure.

[0025] Figure 6 is a schematic diagram illustrating a photovoltaic system according to an embodiment of the present disclosure. Detailed Implementation

[0026] The following detailed description is provided to aid in obtaining a full understanding of the methods, apparatus, and / or systems described herein. However, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein; equivalent substitutions or changes may be made, except for operations that must occur or be performed in a specific order. Furthermore, for clarity and conciseness, descriptions of content well-known in the art will be omitted or simplified.

[0027] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains upon understanding this disclosure. Unless expressly defined herein, terms (such as those defined in a general dictionary) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and in this disclosure, and shall not be interpreted in an idealized or overly formalistic manner.

[0028] Unless otherwise specified, the same reference numerals generally refer to the same elements (e.g., components, steps, and methods). Reference numerals described in previous embodiments that reappear in later embodiments may be omitted. Furthermore, technical features described in different or the same embodiments can be combined in any way, as long as the combined embodiment or technical solution is complete and can solve the technical problems of this application or achieve the technical effects described or not described in this disclosure but which can be determined based on the complete technical solution described above.

[0029] The wind-solar system disclosed herein refers to a system comprising wind turbine generators and photovoltaic systems built on the same site. The wind-solar system may include integrated wind turbine generators and photovoltaic systems, with the photovoltaic system mounted on the wind turbine generators, for example, on a wind turbine foundation.

[0030] The control method according to the embodiments of this disclosure uses the full power output of the generator unit as the basis for judgment to control the actual power generation of the wind and solar system.

[0031] As an example, the control method of this disclosure may include: determining whether the wind-solar system includes an energy storage system; in response to determining that the wind-solar system does not include an energy storage system, determining whether the power output of the wind turbine is between the cut-in power output of the wind turbine and the full power output of the wind turbine; in response to the power output of the wind turbine being between the cut-in power output of the wind turbine and the full power output of the wind turbine, controlling the actual power output of the wind turbine and the actual power output of the photovoltaic system based on the relationship between the sum of the power output of the wind turbine and the power output of the photovoltaic system and the full power output of the wind turbine.

[0032] The relationship between the sum of the power output of the wind turbine and the power output of the photovoltaic system and the full power output of the wind turbine can be determined by the ratio between the two, the difference between the two, etc.

[0033] Based on the relationship between the sum of the generateable power of the wind turbine and the photovoltaic system and the full-power output of the wind turbine, the steps for controlling the actual power output of the wind turbine and the photovoltaic system include: in response to the sum of the generateable power of the wind turbine and the photovoltaic system being less than or equal to the full-power output of the wind turbine, controlling the actual power output of the wind turbine to the generateable power output of the wind turbine, and controlling the actual power output of the photovoltaic system to the generateable power output of the photovoltaic system.

[0034] Based on the relationship between the sum of the generateable power of the wind turbine and the photovoltaic system and the full-capacity power of the wind turbine, the step of controlling the actual generateable power of the wind turbine and the photovoltaic system further includes: in response to the sum of the generateable power of the wind turbine and the photovoltaic system being greater than the full-capacity power of the wind turbine, controlling the actual generateable power of the wind turbine to the generateable power of the wind turbine, and controlling the actual generateable power of the photovoltaic system to the difference between the full-capacity power of the wind turbine and the generateable power of the wind turbine. Embodiments of this disclosure will now be described with reference to Figures 1 to 6.

[0035] Figure 1 is a flowchart illustrating a control method according to a first embodiment of the present disclosure, and Figure 2 is a flowchart illustrating a control method according to a second embodiment of the present disclosure.

[0036] Referring to FIG1, the control method according to the first embodiment of the present disclosure may include steps S110, S120, S130, S140, S150, S160 and S170.

[0037] In step S110, the power generation capacity P of the wind turbine generator set is determined. w Is it less than or equal to the full power output P of the wind turbine generator set? wmax .

[0038] The generating capacity of a wind turbine can be estimated based on several factors, such as current wind speed, air density, and the turbine's performance curve. Current wind speed can be monitored in real time by sensors installed on the turbine. The turbine's performance curve can be a curve showing the expected generating capacity at different wind speeds. Air density is affected by temperature and air pressure and can be measured by meteorological instruments.

[0039] The power generation capacity P of the wind turbine generator set wThe value can be obtained from actual measurements, or it can be a projected value calculated using a model based on current weather conditions and wind turbine performance. Furthermore, considering the variations and uncertainties in wind speed, historical data and predictive models can be combined to determine the generating capacity.

[0040] In step S120, in response to the power generation capacity P of the wind turbine generator set w Less than or equal to the full power output P of the wind turbine generator set wmax (P) w ≤P wmax Determine the generateable power P of the wind turbine generator set. w Is it greater than or equal to the cut-in generating capacity of the wind turbine generator (P)? wmin The cut-in power generation here refers to the power generation of the wind turbine generator when it is cut in. "Cut-in" for a wind turbine generator refers to the lowest wind speed at which the wind turbine begins to start and generate electricity. When the wind speed reaches this threshold, the rotor begins to rotate and the generator begins to produce electricity. This wind speed is called the cut-in wind speed, and it is typically between 3 and 5 meters per second (approximately 10 to 18 kilometers per hour).

[0041] In step S130, in response to determining the generateable power P of the wind turbine generator set w Greater than or equal to the cut-in generating power P of the wind turbine generator set wmin (P) w ≥P wmin Determine the generateable power P of the wind turbine generator set. w With the power generation P of the photovoltaic system pv The sum of (P) w +P pv Is it less than or equal to the full-power output P of the wind turbine generator set? wmax .

[0042] In step S140, the actual power generation P' of the wind turbine generator set is... w Controlled to the power generation capacity P of the wind turbine generator set w (P' w =P w ), and the actual power generation P' of the photovoltaic system pv Controlled to the power generation P of the photovoltaic system pv (P' pv =P pv Therefore, during periods of low wind power generation, the wind-solar hybrid characteristics can be utilized to reduce the self-consumption of wind turbines through photovoltaic power generation, thereby improving the grid connection capability of wind turbines. At the same time, control strategies that use photovoltaics to reduce the self-consumption of wind turbines can be considered to minimize the losses of wind turbines.

[0043] In step S150, this can be in response to the wind turbine's power output being greater than its full power output (P). w >P wmax The actual power output of the wind turbine generator is controlled to the full power output (P') of the wind turbine generator. w =P wmax ), and control the actual power generation of the photovoltaic system to zero (P' pv =0). As an example, during peak wind power periods, droop control can be used to change the optimal control point of wind power, enabling it to have a certain grid connection capability and improve its peak-shaving capability during peak periods.

[0044] In step S160, the power generation capacity P of the wind turbine generator set can be responded to. w With the power generation P of the photovoltaic system pv The sum of (P) w +P pv The power output P of the wind turbine generator set is less than or equal to its full power output. wmax The actual power generation of the photovoltaic system is controlled to be the full power output of the wind turbine generator and the power generation capacity of the wind turbine generator (P'). pv =P wmax -P w ).

[0045] In step S170, this can be in response to the wind turbine's generateable power being less than its cut-in generating power (P). w <P wmin The actual power generation of the wind turbine generator is controlled to zero (P'). w =0), and control the actual power generation of the photovoltaic system to the power generation capacity of the photovoltaic system (P'). pv =P pv ).

[0046] As an example, in response to determining that the wind-solar system includes an energy storage system, it can be determined whether the power output of the wind turbine is between the cut-in power output and the full power output of the wind turbine. In response to determining that the power output of the wind turbine is between the cut-in power output and the full power output of the wind turbine, the actual power output of the wind turbine, the actual power output of the photovoltaic system, and the charging / discharging power of the energy storage system can be controlled based on the relationship between the sum of the power output of the wind turbine, the power output of the photovoltaic system, and the maximum discharge power of the energy storage system and the full power output of the wind turbine.

[0047] In response to the condition that the sum of the generating power of the wind turbine, the generating power of the photovoltaic system, and the maximum discharging power of the energy storage system is less than or equal to the full-power output of the wind turbine, the actual generating power of the wind turbine is controlled to its generating power, the actual generating power of the photovoltaic system is controlled to its generating power, and the discharging power of the energy storage system is controlled to its maximum discharging power. This allows for the utilization of the wind-solar complementary characteristics, reducing the self-consumption of the wind turbine through photovoltaic power generation, and further optimizing grid functionality through a coordinated wind-solar-storage control strategy.

[0048] In response to the situation where the sum of the generating power of the wind turbine, the generating power of the photovoltaic system, and the maximum discharging power of the energy storage system is greater than the full generating power of the wind turbine, and the sum of the generating power of the wind turbine and the generating power of the photovoltaic system is less than the full generating power of the wind turbine, the actual generating power of the wind turbine is controlled to the generating power of the wind turbine, the actual generating power of the photovoltaic system is controlled to the generating power of the photovoltaic system, and the discharging power of the energy storage system is controlled to the difference between the full generating power of the wind turbine and the total generating power of the wind turbine and the photovoltaic system.

[0049] In response to the situation where the sum of the generating power of the wind turbine, the generating power of the photovoltaic system, and the maximum discharging power of the energy storage system is greater than the full power of the wind turbine, and the sum of the generating power of the wind turbine and the generating power of the photovoltaic system is greater than the full power of the wind turbine but less than or equal to the sum of the full power of the wind turbine and the maximum charging power of the energy storage system, the actual generating power of the wind turbine is controlled to the generating power of the wind turbine, the actual generating power of the photovoltaic system is controlled to the generating power of the photovoltaic system, and the charging power of the energy storage system is controlled to the difference between the total generating power of the wind turbine and the photovoltaic system and the full power of the wind turbine.

[0050] In response to the situation where the sum of the generating power of the wind turbine, the generating power of the photovoltaic system, and the maximum discharging power of the energy storage system is greater than the full generating power of the wind turbine, and the sum of the generating power of the wind turbine and the generating power of the photovoltaic system is greater than the full generating power of the wind turbine and the maximum charging power of the energy storage system, the actual generating power of the wind turbine is controlled to the generating power of the wind turbine, the charging power of the energy storage system is controlled to the maximum charging power of the energy storage system, and the generating power of the photovoltaic system is controlled to be the difference between the sum of the full generating power of the wind turbine and the maximum charging power of the energy storage system and the generating power of the wind turbine.

[0051] Referring specifically to Figure 2, the control method of the second embodiment of this disclosure may include steps S210, S220, S230, S240, and S250, and may also include steps S211, S212, and S213. As an example, the control method according to the second embodiment of this disclosure may also include steps S231, S232, S233, S234, and S235.

[0052] In step S210, the power generation capacity P of the wind turbine generator set can be determined. w Is it less than or equal to the full power output P of the wind turbine generator set? wmax .

[0053] In step S220, the generating power P of the wind turbine generator can be determined in response to this. w Less than or equal to the full power output P of the wind turbine generator set wmax (P) w ≤P wmax This further determines whether the generating capacity of the wind turbine is greater than or equal to the cut-in generating capacity of the wind turbine.

[0054] In step S230, in response to determining that the generating capacity of the wind turbine is greater than or equal to the cut-in generating capacity (P) of the wind turbine, w ≥P wmin Further determine the generateable power P of the wind turbine generator set. w The power generation capacity P of the photovoltaic system pv and the maximum discharge power P of the energy storage system BD The sum of the three (P) w +P pv +P BD Is it less than or equal to the full-power output P of the wind turbine generator set? wmax .

[0055] In step S240, in response to determining the generateable power P of the wind turbine generator set, w The power generation capacity P of the photovoltaic system pv and the maximum discharge power P of the energy storage system BD The sum of the three (P) w +P pv +P BD The power output P of the wind turbine generator set is less than or equal to its full power output. wmax (P) w +P pv +P BD ≤P wmax The actual power output of the wind turbine generator set is controlled to the power output (P') of the wind turbine generator set. w =P wThe actual power generation of the photovoltaic system is controlled to the power generation capacity (P') of the photovoltaic system. pv =P pv And control the discharge power of the energy storage system to the maximum discharge power (P') of the energy storage system. BD =P BD At the same time, the discharge power of the energy storage system can be controlled to zero (P'). BC =0).

[0056] In step S250, in response to determining that the generating capacity of the wind turbine is less than the cut-in generating capacity (P) of the wind turbine, w <P wmin The actual power generation of the wind turbine generator is controlled to zero (P'). w =0), thus controlling the actual power generation of the photovoltaic system to the power generation capacity of the photovoltaic system (P'). pv =P pv And control the discharge power of the energy storage system to the maximum discharge power (P') of the energy storage system. BD =P BD At the same time, the charging power of the energy storage system can be controlled to zero (P'). BC =0).

[0057] In step S211, the generating power P of the wind turbine generator can be determined in response to this. w Greater than the full power output P of the wind turbine generator set wmax (P) w >P wmax Further determine the power generation capacity P of the photovoltaic system. pv Is it less than or equal to the maximum rechargeable power P of the wind turbine generator set? BC .

[0058] In step S212, the power generation capacity P of the photovoltaic system can be determined. pv Less than or equal to the maximum rechargeable power P of the wind turbine generator set BC (P) pv ≤P BC The actual power generation of the wind turbine generator set is controlled to the full power generation P of the wind turbine generator set. wmax (P' w =P wmax The actual power generation of the photovoltaic system is controlled to the maximum rechargeable power (P') of the energy storage system. pv =P BC And control the charging power of the energy storage system to the maximum rechargeable power (P') of the energy storage system. BC =P BC Furthermore, the discharge power of the energy storage system can be controlled to zero (P'). BD=0).

[0059] In step S213, the power generation capacity P of the photovoltaic system can be determined. pv Greater than the maximum rechargeable power P of the wind turbine generator set BC (P) pv >P BC The actual power generation of the wind turbine generator set is controlled to the full power generation P of the wind turbine generator set. wmax (P' w =P wmax The actual power generation of the photovoltaic system is controlled to the power generation capacity (P') of the photovoltaic system. pv =P pv The charging power control of the energy storage system is equal to the rechargeable power (P') of the photovoltaic system. BC =P pv ), and control the discharge power of the energy storage system to zero (P' BD =0).

[0060] In step S231, in response to determining the generateable power P of the wind turbine generator set w The power generation capacity P of the photovoltaic system pv and the maximum discharge power P of the energy storage system BD The sum of the three (P) w +P pv +P BD () greater than the full-power output P of the wind turbine generator set wmax (P) w +P pv +P BD >P wmax Further determine the generateable power P of the wind turbine generator set. w And the power generation P of the photovoltaic system pv Is the sum of the two less than or equal to the full-power P of the wind turbine generator? wmax .

[0061] In step S232, in response to determining the generateable power P of the wind turbine generator set w And the power generation P of the photovoltaic system pv The sum of the two is greater than the full-power output P of the wind turbine generator. wmax (P) w +P pv >P wmax Further determine the generateable power P of the wind turbine generator set. w And the power generation P of the photovoltaic system pv Is the sum of the two less than or equal to the full-power P of the wind turbine generator? wmax With the maximum rechargeable power P of the energy storage system BC The sum of (P)wmax +P BC ).

[0062] In step S233, in response to the power generation capacity P of the wind turbine generator set w And the power generation P of the photovoltaic system pv The sum of the two is greater than the full-power output P of the wind turbine generator. wmax With the maximum rechargeable power P of the energy storage system BC (P) w +P pv ≤P wmax +P BC The actual power output of the wind turbine generator set is controlled to the power output (P') of the wind turbine generator set. w =P w The actual power generation of the photovoltaic system is controlled to be the full power generation P of the wind turbine generator set. wmax With the maximum rechargeable power P of the energy storage system BC The sum of these and the power generation capacity P of the wind turbine generator set w The difference (P') pv =P wmax +P BC -P w And control the charging power of the energy storage system to the maximum rechargeable power (P') of the energy storage system. BC =P BC At the same time, the discharge power of the energy storage system is controlled to zero (P'). BD =0).

[0063] In step S234, in response to determining the generateable power P of the wind turbine generator set w And the power generation P of the photovoltaic system pv The sum of the two is less than or equal to the full-power P of the wind turbine generator. wmax With the maximum rechargeable power P of the energy storage system BC (P) wmax +P BC The actual power output of the wind turbine generator set is controlled to the power output (P') of the wind turbine generator set. w =P w The actual power generation of the photovoltaic system is controlled to the power generation capacity (P') of the photovoltaic system. pv =P pv Furthermore, the charging power of the energy storage system is controlled to be equal to the generating power P of the wind turbine generator. w With the power generation P of the photovoltaic system pv The difference between the sum of the two and the full-power output of the wind turbine (P') BC =P w +P pv -Pwmax At the same time, the discharge power of the energy storage system is controlled to zero (P'). BD =0).

[0064] In step S235, in response to determining the generateable power P of the wind turbine generator set w And the power generation P of the photovoltaic system pv The sum of the two is less than or equal to the full-power output P of the wind turbine generator. wmax The actual power output of the wind turbine generator is controlled to the power output (P') of the wind turbine generator. w =P w The actual power generation of the photovoltaic system is controlled to the power generation capacity (P') of the photovoltaic system. pv =P pv Furthermore, the discharge power of the energy storage system is controlled to be equal to the full power output of the wind turbine generator set and the power output P of the wind turbine generator set. w The difference between the two is related to the power generation capacity P of the photovoltaic system. pv The difference (P') BD =P wmax -P w -P pv At the same time, the charging power of the energy storage system is controlled to zero (P'). BC =0).

[0065] The maximum rechargeable power and maximum dischargeable power of an energy storage system are determined by its design parameters, which are typically provided by the energy storage equipment manufacturer. The power generation capacity of a photovoltaic (PV) system is determined by factors such as sunlight intensity, PV panel area, and PV module conversion efficiency, while the dischargeable power is determined by the charging capacity and design parameters of the energy storage system.

[0066] The photovoltaic system and wind turbine generator disclosed herein can be designed as an integrated unit. The photovoltaic system can be installed on the base of the wind turbine generator, and the photovoltaic modules of the photovoltaic system can be arranged in a fan shape around the tower of the wind turbine generator.

[0067] Figure 3 is a top view showing the installation method of the photovoltaic module according to an embodiment of the present disclosure, and Figure 4 is a side view showing the installation method of the photovoltaic module according to an embodiment of the present disclosure.

[0068] Referring to Figures 3 and 4, in terms of layout structure, the photovoltaic modules can be fixedly installed on the wind turbine foundation 20 at an optimal tilt angle (between 30° and 45° depending on latitude). The photovoltaic modules 31, while avoiding shading from the wind turbine tower 10, can be arranged in a fan shape around the south and east / west sides of the tower. The height difference between the front support 32 and the rear support 33 of the photovoltaic modules can be between 4m and 6m. As an example, the front support 32 can be approximately 1.5m, and the rear support 33 can be approximately 6m, thus completely avoiding the space required for access stairs for tower maintenance. This reduces photovoltaic shading and minimizes power generation losses.

[0069] As an example, photovoltaic modules can be initially arranged according to the land area of ​​the wind turbine foundation (a circular foundation can be about 300-500㎡, and a square foundation can be about 400-600㎡; the specific installed capacity can be optimized and adjusted according to the land area and shape). This can solve the problem of land use for photovoltaics and can be carried out by retrofitting existing wind farms.

[0070] Based on the conversion efficiency of the photovoltaic modules, approximately 80-140 60-panel monocrystalline photovoltaic modules can be arranged, with a total installed capacity of approximately 40-70 kWp. To avoid shading from the wind turbine tower, the photovoltaic module array is installed in a fan-shaped configuration on the south and east / west sides of the wind turbine tower (the central angle of the fan varies from 41° to 47° depending on the latitude). The photovoltaic installed capacity and support installation scheme are flexibly optimized based on factors such as the shape of the wind turbine foundation (circular or square), the site's radiation, the optimal tilt angle, and the solar azimuth angle between 9 AM and 3 PM on the winter solstice.

[0071] The photovoltaic system disclosed herein can be DC connected to the DC bus at the front end of the converter of the wind turbine generator set. This disclosure allows direct connection to the DC bus of the wind turbine via a DC voltage regulator module using IGBT modules as switching transistors. The photovoltaic system and the wind turbine generator set share equipment such as converters, transformers, and collector lines, eliminating the need for re-acquisition of land and maximizing the utilization of land and equipment resources in the wind farm.

[0072] Sharing equipment such as wind turbine converters, step-up transformers, and collector lines can improve equipment utilization and reduce equipment investment. In addition, voltage stabilization modules can be integrated into the front end of the converter during the wind turbine product development process, and photovoltaic (or energy storage) interfaces can be reserved.

[0073] Figure 5 is a schematic diagram of a wind power system according to an embodiment of the present disclosure, and Figure 6 is a schematic diagram of a photovoltaic system according to an embodiment of the present disclosure.

[0074] Referring to Figure 5, the wind turbine generator converts wind energy into DC power through a machine-side converter (AC-DC). The machine-side converter can be connected to an energy storage system via an energy storage-side converter, and can further convert DC power into AC power through a grid-side converter. The AC power is output to the wind farm substation via an LC filter used to filter out harmonics and other interferences in the AC power. Specifically, it can be transmitted to the wind farm substation through a collector line.

[0075] The input node B of the photovoltaic system can be located at the DC bus at the front end of the converter, using high-voltage DC input, resulting in lower line loss, inverter loss, and fewer strings.

[0076] Referring to Figure 6, the photovoltaic module string can be connected to the DC-DC voltage regulator module via a three-in-one combiner box. The photovoltaic module string can include 28-32 380Wp photovoltaic modules connected in series to form a string.

[0077] A 1500VDC three-in-one combiner box can be used to collect and combine DC power from multiple strings. The combiner box may contain protective devices such as fuses and disconnect switches to protect the photovoltaic array from short circuits or other faults.

[0078] The DC-DC voltage regulator module can stabilize the voltage at around 1050V. The output port A of the DC-DC can be connected to node B of the wind power system (as shown in Figure 5, the input node of the photovoltaic system).

[0079] As an example, the MPPT module may include a maximum power point tracking (MPPT) module and a PWM controller. It can ensure that the system can output maximum power under various lighting conditions by adjusting the operating point. The MPPT module can determine the duty cycle and input the relevant instructions of the duty cycle to the PWM controller. The PWM controller can control the DC-DC regulator module with the instructions from the MPPT module to achieve maximum power point tracking.

[0080] The control method according to the exemplary embodiments of this disclosure can rely entirely on the operation of computer programs or instructions to achieve the corresponding functions. That is, each device corresponds to each step in the functional architecture of the computer program, so that the entire system is called through a special software package (e.g., a lib library) to achieve the corresponding functions.

[0081] A computer-readable storage medium according to embodiments of the present disclosure may store a program or instructions that, when executed by a processor, cause the processor to perform the control method described above.

[0082] The controller for the wind and solar system disclosed herein may include a memory and a processor. The memory stores programs or instructions, which, when executed by the processor, cause the processor to perform the control method described above. The wind power converter disclosed herein may include the aforementioned controller.

[0083] The control method for wind and solar systems according to embodiments of the present disclosure can improve the power generation efficiency of wind and solar systems.

[0084] The control method for a wind-solar system according to embodiments of the present disclosure can reduce power generation losses in a wind-solar co-firing system.

[0085] The specific embodiments of this disclosure have been described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments can be combined, modified and improved without departing from the principles and spirit of this disclosure as defined by the claims and their equivalents. Such combinations, modifications and improvements should also be within the protection scope of this disclosure.

Claims

1. A control method for a wind-solar system, characterized in that, The wind-solar system includes an integrated wind turbine generator and a photovoltaic system. The control method includes: determining whether the wind-solar system includes an energy storage system; in response to determining that the wind-solar system does not include an energy storage system, determining whether the power output of the wind turbine generator is between the cut-in power output and the full power output of the wind turbine generator; in response to the fact that the power output of the wind turbine generator is between the cut-in power output and the full power output of the wind turbine generator, controlling the actual power output of the wind turbine generator and the actual power output of the photovoltaic system based on the relationship between the sum of the power output of the wind turbine generator and the power output of the photovoltaic system and the full power output of the wind turbine generator.

2. The control method for a wind-solar system according to claim 1, characterized in that, Based on the relationship between the sum of the generateable power of the wind turbine and the photovoltaic system and the full-power output of the wind turbine, the steps for controlling the actual power output of the wind turbine and the photovoltaic system include: in response to the sum of the generateable power of the wind turbine and the photovoltaic system being less than or equal to the full-power output of the wind turbine, controlling the actual power output of the wind turbine to the generateable power output of the wind turbine, and controlling the actual power output of the photovoltaic system to the generateable power output of the photovoltaic system.

3. The control method for a wind-solar system according to claim 2, characterized in that, Based on the relationship between the sum of the generateable power of the wind turbine and the photovoltaic system and the full-power output of the wind turbine, the steps of controlling the actual power output of the wind turbine and the photovoltaic system further include: in response to the sum of the generateable power of the wind turbine and the photovoltaic system being greater than the full-power output of the wind turbine, controlling the actual power output of the wind turbine to the generateable power output of the wind turbine, and controlling the actual power output of the photovoltaic system to the difference between the full-power output of the wind turbine and the generateable power output of the wind turbine.

4. The control method for a wind-solar system according to claim 2, characterized in that, In response to the wind turbine's generating capacity being greater than its full generating capacity, the actual generating capacity of the wind turbine is controlled to its full generating capacity, and the actual generating capacity of the photovoltaic system is controlled to zero; in response to the wind turbine's generating capacity being less than its cut-in generating capacity, the actual generating capacity of the wind turbine is controlled to zero, and the actual generating capacity of the photovoltaic system is controlled to its generating capacity.

5. The control method for a wind-solar system according to claim 1, characterized in that, In response to determining that the wind and solar system includes an energy storage system, it is determined whether the power output of the wind turbine generator is between the cut-in power output and the full power output of the wind turbine generator. In response to determining that the power output of the wind turbine generator is between the cut-in power output and the full power output of the wind turbine generator, the actual power output of the wind turbine generator, the actual power output of the photovoltaic system, and the charging and discharging power of the energy storage system are controlled based on the relationship between the sum of the power output of the wind turbine generator, the power output of the photovoltaic system, and the maximum discharge power of the energy storage system and the full power output of the wind turbine generator.

6. The control method for a wind-solar system according to claim 5, characterized in that, In response to a situation where the sum of the generating power of the wind turbine, the generating power of the photovoltaic system, and the maximum discharging power of the energy storage system is less than or equal to the full generating power of the wind turbine, the actual generating power of the wind turbine is controlled to the generating power of the wind turbine, the actual generating power of the photovoltaic system is controlled to the generating power of the photovoltaic system, and the discharging power of the energy storage system is controlled to the maximum discharging power of the energy storage system; in response to a situation where the sum of the generating power of the wind turbine, the generating power of the photovoltaic system, and the maximum discharging power of the energy storage system is greater than the full generating power of the wind turbine, and the sum of the generating power of the wind turbine and the generating power of the photovoltaic system is less than the full generating power of the wind turbine, the actual generating power of the wind turbine is controlled to the generating power of the wind turbine, the actual generating power of the photovoltaic system is controlled to the generating power of the photovoltaic system, and the discharging power of the energy storage system is controlled to the difference between the full generating power of the wind turbine and the total generating power of the wind turbine and the photovoltaic system.

7. The control method for a wind-solar system according to claim 6, characterized in that, In response to the fact that the sum of the generating power of the wind turbine, the generating power of the photovoltaic system, and the maximum discharging power of the energy storage system is greater than the full power of the wind turbine, and the sum of the generating power of the wind turbine and the generating power of the photovoltaic system is greater than the full power of the wind turbine but less than or equal to the sum of the full power of the wind turbine and the maximum charging power of the energy storage system, the actual generating power of the wind turbine is controlled to the generating power of the wind turbine, the actual generating power of the photovoltaic system is controlled to the generating power of the photovoltaic system, and the charging power of the energy storage system is controlled to the difference between the total generating power of the wind turbine and the photovoltaic system and the full power of the wind turbine.

8. The control method for a wind-solar system according to claim 7, characterized in that, In response to the fact that the sum of the generating power of the wind turbine, the generating power of the photovoltaic system, and the maximum discharging power of the energy storage system is greater than the full-power output of the wind turbine, and the sum of the generating power of the wind turbine and the generating power of the photovoltaic system is greater than the full-power output of the wind turbine and the maximum charging power of the energy storage system, the actual generating power of the wind turbine is controlled to the generating power of the wind turbine, the charging power of the energy storage system is controlled to the maximum charging power of the energy storage system, and the generating power of the photovoltaic system is controlled to be the difference between the sum of the full-power output of the wind turbine and the maximum charging power of the energy storage system and the generating power of the wind turbine.

9. The control method for a wind-solar system according to any one of claims 1 to 8, characterized in that, The photovoltaic system is installed on the base of the wind turbine generator set, and the photovoltaic modules of the photovoltaic system are arranged in a fan shape around the tower of the wind turbine generator set.

10. The control method for a wind-solar system according to any one of claims 1 to 8, characterized in that, The photovoltaic system is DC connected to the DC bus at the front end of the converter of the wind turbine generator set.

11. A controller for a wind and solar system, characterized in that, The controller includes a memory and a processor, the memory storing a program or instructions that, when executed by the processor, cause the processor to perform the control method according to any one of claims 1 to 10.

12. A wind power converter, characterized in that, The wind power converter includes the controller according to claim 11.

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