Control method and control system of hybrid power supply

Abstract

The invention discloses a control method and a control system for a hybrid power supply, and relates to the technical field of hybrid power supply, and the control method comprises the steps: S10, comparing the current voltage of a DC bus bar with a preset battery standby voltage and an oil engine stop voltage; wherein the battery standby voltage is larger than the oil engine stop voltage; and S20, controlling the working states of a wind energy controller, a photovoltaic controller, a rectifier and an oil engine according to a comparison result and a preset rule so as to store or release wind energy and light energy by utilizing partial capacity of the battery. Part of capacity of the battery is used for storing electric energy converted from wind energy and light energy, part of capacity of the battery is recycled as much as possible to supply power to the load, wind energy and light energy are fully utilized, meanwhile, use of an oil engine can be avoided as much as possible, and fuel oil waste is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid power supply, and in particular to a control method and a control system for a hybrid power supply. Background Art

[0002] At present, the development and utilization of clean and renewable energy, such as wind energy, solar energy, and hydropower, has received more and more attention. How to use clean and renewable energy efficiently and stably, reduce dependence on traditional fossil fuels, and achieve the goal of energy conservation and emission reduction has always been an important research topic in various fields.

[0003] At present, hybrid power supply systems have begun to use solar energy and wind energy on a large scale based on the original mains electricity, diesel engines and batteries, forming a hybrid power supply system powered by wind, light, oil, electricity (mains electricity) and storage (batteries).

[0004] However, the current hybrid power system control method does not make reasonable use of solar energy and wind energy, resulting in waste of solar energy or wind energy in some scenarios. At the same time, the diesel engine works for a long time, resulting in waste of wind energy and light energy and high fuel consumption. Summary of the invention

[0005] The embodiment of the present invention provides a control method and control system for a hybrid power supply to solve the technical problem in the related art that the existing hybrid power supply does not fully utilize wind energy and light energy, the oil engine runs for a long time, resulting in waste of wind energy and light energy and high oil consumption.

[0006] In a first aspect, a control method for a hybrid power supply is provided, comprising the following steps:

[0007] Compare the current voltage of the DC bus bar with the preset battery backup voltage and the oil generator stop voltage; wherein the battery backup voltage is greater than the oil generator stop voltage;

[0008] Based on the comparison results, the working states of the wind energy controller, photovoltaic controller, rectifier and oil generator are controlled according to preset rules to utilize part of the battery capacity to store or release wind energy and light energy.

[0009] In some embodiments, the operation of controlling the wind energy controller, the photovoltaic controller, the rectifier and the oil generator according to the comparison result and the preset rules so as to utilize part of the capacity of the battery to store or release wind energy and light energy includes:

[0010] When the current voltage of the DC busbar is not less than the battery backup voltage, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be less than or equal to the battery backup voltage; if there is no AC input, control the oil generator to shut down; control the secondary load and the main load to power on;

[0011] If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, the output voltage of the wind energy controller and / or photovoltaic controller is controlled to be equal to the battery equalization charging voltage; the secondary load and the main load are controlled to be powered on;

[0012] If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, the rectifier output voltage is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to shut down; the secondary load and the main load are controlled to power on.

[0013] In some embodiments, the operation of controlling the wind energy controller, the photovoltaic controller, the rectifier and the oil generator according to the comparison result and the preset rules so as to utilize part of the capacity of the battery to store or release wind energy and light energy includes:

[0014] When the current voltage of the DC busbar is less than the battery backup voltage and not less than the oil generator stop voltage, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the oil generator to stop; control the secondary load and the main load to power on;

[0015] If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, the output voltage of the wind energy controller and / or photovoltaic controller is controlled to be equal to the battery equalization charging voltage; the secondary load and the main load are controlled to be powered on;

[0016] If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, the rectifier output voltage is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to shut down; the secondary load and the main load are controlled to power on.

[0017] In some embodiments, the control method of the hybrid power supply further includes:

[0018] The current voltage of the DC busbar is also compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage; wherein, the oil engine stop voltage> the oil engine starting voltage> the secondary load power-on voltage> the secondary load power-off voltage> the main load power-on voltage> the main load power-off voltage;

[0019] When the current voltage of the DC busbar is less than the stop voltage of the oil generator and not less than the start voltage of the oil generator, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the oil generator to keep starting; control the secondary load and the main load to power on;

[0020] If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, the output voltage of the wind energy controller and / or photovoltaic controller is controlled to be equal to the battery equalization charging voltage; the secondary load and the main load are controlled to be powered on;

[0021] If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, the rectifier output voltage is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to keep starting; the secondary load and the main load are controlled to power on.

[0022] In some embodiments, the current voltage of the DC bus bar is further compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0023] When the current voltage of the DC busbar is less than the starting voltage of the oil generator and not less than the power-on voltage of the secondary load, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the oil generator to keep starting; control the secondary load and the main load to power on;

[0024] If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load and the main load to power on;

[0025] If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, the rectifier output voltage is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to keep starting; the secondary load and the main load are controlled to power on.

[0026] In some embodiments, the current voltage of the DC bus bar is further compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0027] When the current voltage of the DC busbar is less than the secondary load power-on voltage and not less than the secondary load power-off voltage, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0028] If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load to maintain the current state, and control the main load to power on;

[0029] If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and main load to power on;

[0030] If the wind energy controller, photovoltaic controller and rectifier have no output, the oil engine is controlled to start; the secondary load is controlled to maintain the current state, and the main load is controlled to power on.

[0031] In some embodiments, the current voltage of the DC bus bar is further compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0032] When the current voltage of the DC busbar is less than the power-off voltage of the secondary load and not less than the power-on voltage of the main load, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0033] If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load to power off and control the main load to power on;

[0034] If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and main load to power on;

[0035] If the wind energy controller, photovoltaic controller and rectifier have no output, control the oil engine to start; control the secondary load to power off, and control the main load to power on.

[0036] In some embodiments, the current voltage of the DC bus bar is further compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0037] When the current voltage of the DC busbar is less than the power-on voltage of the main load and not less than the power-off voltage of the main load, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0038] If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load to power off, and control the main load to maintain the current state;

[0039] If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and main load to power on;

[0040] If the wind energy controller, photovoltaic controller and rectifier have no output, the oil engine is controlled to start; the secondary load is controlled to power off, and the main load is controlled to maintain the current state.

[0041] In some embodiments, the current voltage of the DC bus bar is further compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0042] When the current voltage of the DC busbar is lower than the power-off voltage of the main load, if the wind energy controller, photovoltaic controller and rectifier all have output, the output voltage of the wind energy controller and photovoltaic controller is controlled to be equal to the battery equalization charging voltage, and the output voltage of the rectifier is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to keep starting; the secondary load and the main load are controlled to power on;

[0043] If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load and the main load to power off;

[0044] If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and main load to power on;

[0045] If the wind energy controller, photovoltaic controller and rectifier have no output, the oil generator is controlled to start; the secondary load and main load are controlled to power off.

[0046] In some embodiments, the step of controlling the output voltage of the wind energy controller and the photovoltaic controller to be equal to the battery equalization charging voltage includes:

[0047] If the sum of the output power of the wind energy controller and the photovoltaic controller is greater than or equal to the sum of the load power and the maximum charging power of the battery, the wind energy controller and the photovoltaic controller are output at the maximum limited charging current;

[0048] If the sum of the output powers of the wind energy controller and the photovoltaic controller is less than the sum of the load power and the maximum charging power of the battery, the wind energy controller and the photovoltaic controller are made to output the maximum charging current that can be provided to the battery.

[0049] In a second aspect, a control system for a hybrid power supply is provided, comprising: a wind energy controller, a photovoltaic controller, a rectifier and a main controller;

[0050] The wind energy controller is connected to the wind turbine and the DC busbar, the photovoltaic controller is connected to the photovoltaic power generation assembly and the DC busbar, the rectifier is connected to the mains, the oil generator and the DC busbar, and the battery is connected to the DC busbar;

[0051] The main controller is connected to the wind energy controller, the photovoltaic controller, the rectifier and the oil generator, and is configured as follows:

[0052] Compare the current voltage of the DC bus bar with the preset battery backup voltage and the oil generator stop voltage; wherein the battery backup voltage is greater than the oil generator stop voltage;

[0053] According to the comparison result, the working states of the wind energy controller, the photovoltaic controller, the rectifier and the oil engine are controlled according to preset rules, so as to utilize part of the capacity of the battery to store or release wind energy and light energy.

[0054] The beneficial effects brought about by the technical solution provided by the present invention include:

[0055] The embodiment of the present invention provides a control method and control system for a hybrid power supply, wherein the control method first compares the current voltage of the DC bus bar with the preset battery backup voltage and the oil engine stop voltage; then controls the working state of the wind energy controller, photovoltaic controller, rectifier and oil engine according to the comparison result and preset rules, so as to utilize part of the capacity of the battery to store or release wind energy and light energy. The present invention utilizes part of the capacity of the battery to store the electric energy converted from wind energy and light energy, and recycles part of the capacity of the battery as much as possible to power the load, making full use of wind energy and light energy, while avoiding the use of the oil engine as much as possible to reduce fuel waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0057] Figure 1 A flow chart of a control method for a hybrid power supply provided by an embodiment of the present invention;

[0058] Figure 2 A schematic diagram of a control system of a hybrid power supply provided by an embodiment of the present invention;

[0059] Figure 3 The embodiment of the present invention provides Figure 1 A flow chart for implementing step S20;

[0060] Figure 4 The embodiment of the present invention provides Figure 1 Another flow chart for implementing step S20;

[0061] Figure 5 Another flow chart of a method for controlling a hybrid power supply provided by an embodiment of the present invention;

[0062] Figure 6 The embodiment of the present invention provides Figure 5 A second flow chart after implementing step S30;

[0063] Figure 7 The embodiment of the present invention provides Figure 5 The third flow chart after implementing step S30;

[0064] Figure 8 The embodiment of the present invention provides Figure 5 The fourth flow chart after implementing step S30;

[0065] Fig. 9 The embodiment of the present invention provides Figure 5 The fifth flow chart after implementing step S30;

[0066] Fig.10 The embodiment of the present invention provides Figure 5 The sixth flow chart after implementing step S30;

[0067] Fig.11 A flow chart of controlling the output voltage of a wind energy controller and a photovoltaic controller to be equal to the battery equalizing charging voltage provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] The embodiment of the present invention provides a control method for a hybrid power supply, which can solve the technical problem that the existing hybrid power supply does not fully utilize wind energy and light energy, the oil engine runs for a long time, resulting in waste of wind energy and light energy and high oil consumption.

[0070] See also Figure 1 As shown, an embodiment of the present invention provides a method for controlling a hybrid power supply, comprising the following steps:

[0071] Step S10, comparing the current voltage of the DC bus bar with the preset battery backup voltage and the oil engine stop voltage; wherein the battery backup voltage is greater than the oil engine stop voltage.

[0072] Step S20, according to the comparison result, the working states of the wind energy controller, the photovoltaic controller, the rectifier and the oil generator are controlled according to preset rules to utilize part of the capacity of the battery to store or release wind energy and light energy.

[0073] Specifically, see Figure 2 As shown, the embodiment of the present invention provides a control system of a hybrid power supply, which supports wind, light, oil, city electricity, and battery power supply, including: a diesel engine, a wind energy controller, a photovoltaic controller, a rectifier, and a main controller. The wind energy controller is connected to the wind turbine and the DC bus bar, the photovoltaic controller is connected to the photovoltaic power generation component and the DC bus bar, the rectifier is connected to the city electricity, the diesel engine, and the DC bus bar, and the battery is connected to the DC bus bar.

[0074] Among them, wind turbines use wind energy to generate electricity through wind turbines and convert wind energy into high-voltage DC power. Photovoltaic power generation components use solar energy to generate electricity through photovoltaic solar panels and convert solar energy into high-voltage DC power. Diesel engines can convert the combustion of fossil fuels into AC power that is the same as the mains. The mains and the diesel engine are connected to the rectifier. Usually, in order to switch the input power supply, an AC input switch is set between the mains, the diesel engine and the rectifier, which can switch the input power supply and report whether the current power supply is the mains or the diesel engine. The wind energy controller is used to convert the high-voltage DC power of the wind turbine into DC power for the load to the DC bus bar. The photovoltaic controller is used to convert the DC power of the photovoltaic power generation component into DC power for the load to the DC bus bar. The rectifier is used to convert the AC power of the mains and the diesel engine into DC power for the load to the DC bus bar. In addition, the wind energy controller, the photovoltaic controller, and the rectifier all have output voltage and current detection functions. A current detection unit can be set between the battery and the DC bus bar to detect whether the battery is in a charging or discharging state and the size of the charging and discharging current. The power supply objects of the hybrid power supply are generally divided into secondary loads and main loads. Both the secondary loads and the main loads are connected to the DC bus bar, and a switching device is provided between the DC bus bar. The switching device is used to control the power on or off of the secondary loads and the main loads.

[0075] The battery backup voltage does not refer to the battery open circuit voltage, but refers to the voltage at which the battery is charged to the backup capacity. For example, assuming that the battery open circuit voltage is 48V, the battery backup voltage can be preset to 50V. When the battery is charged with the battery backup voltage, the battery cell voltage will increase (and the capacity will increase at the same time). As the voltage difference between the charging voltage and the battery cell voltage decreases, the battery charging current will gradually decrease to near zero. The battery capacity at this time is the backup capacity. For example, when the backup time is required to be 4 hours, the current battery is charged to 80% of its capacity to meet the 4-hour backup requirement, and the charging voltage corresponding to 80% of the battery capacity is set as the battery backup voltage. The purpose of setting the battery backup voltage in the embodiment of the present invention is to utilize the remaining 20% ​​capacity of the battery, store the electrical energy converted from wind energy and light energy, and recycle 20% of the battery capacity as much as possible to power the load, so that wind energy and light energy can be fully utilized. Optionally, when the equipment is expanded or reduced (load changes), or the battery capacity decays after long-term use, the main controller can calculate the total power of the secondary load and the main load, and combine the calculated actual capacity of the battery after full charge, and calculate the required battery backup capacity and the corresponding charging voltage according to the backup time requirement, and adjust the battery backup voltage to a new backup voltage value to adapt to the backup voltage change caused by load changes and battery aging. The oil engine stop voltage means that when the oil engine is in operation, if the voltage of the DC bus bar is higher than the oil engine stop voltage, the main controller will control the oil engine to stop running.

[0076] Further, see Figure 3 As shown, the working states of the wind energy controller, the photovoltaic controller, the rectifier and the oil generator are controlled according to preset rules based on the comparison results to utilize part of the capacity of the battery to store or release wind energy and light energy, including:

[0077] Step S2001, when the current voltage of the DC bus is not less than the battery backup voltage (U≥U1), if the wind energy controller, photovoltaic controller and rectifier all have outputs, control the output voltage of the wind energy controller and the photovoltaic controller to be equal to the battery equalization charging voltage (battery equalization charging voltage>battery backup voltage, the battery can be charged to 100% capacity), and control the output voltage of the rectifier to be less than or equal to the battery backup voltage; if there is no AC power input, control the oil engine to shut down; control the secondary load and the main load to power on. At this time, the rectifier does not charge the battery, and uses the wind energy controller and the photovoltaic controller to power the load and charge the battery, making full use of light energy and wind energy to reduce waste. At the same time, because the rectifier has output, it is determined whether there is an oil engine supplying power. If there is an oil engine supplying power, the oil engine is controlled to stop to avoid fuel waste. In addition, at this time, the power supply is sufficient, and the secondary load and the main load can be powered on, that is, Figure 2 The switching devices K1 and K2 in are both closed.

[0078] Step S2002: If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the secondary load and the main load to be powered on. Similarly, at this time, the wind energy controller and the photovoltaic controller are used to power the load and charge the battery, making full use of light energy and wind energy to reduce waste. At the same time, if the power supply is sufficient, both the secondary load and the main load can be powered on. Figure 2 The switching devices K1 and K2 in are both closed.

[0079] Step S2003, if the wind energy controller and the photovoltaic controller have no output, and the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the oil engine to shut down; control the secondary load and the main load to power on. The current voltage of the DC busbar is not less than the battery backup voltage, indicating that the actual output voltage of the current battery is not less than the battery backup voltage, indicating that the battery power is sufficient to meet the battery backup time requirement, and there is no need to use the rectifier to charge the battery. Control the rectifier output voltage to be equal to the battery backup voltage, that is, it will not charge. At this time, the battery is actually releasing energy to the load to prepare for the subsequent storage of light energy and wind energy, that is, the part of the battery that exceeds the backup capacity will repeatedly store light energy and wind energy and release it to the load to achieve the goal of fully utilizing light energy and wind energy. At the same time, because the rectifier has output, it is determined whether there is an oil engine supplying power. If there is an oil engine supplying power, control the oil engine to stop to avoid fuel waste. In addition, at this time, the power supply is sufficient, and both the secondary load and the main load can be powered on. Figure 2 The switching devices K1 and K2 in are both closed.

[0080] Further, see Figure 4 As shown, the working states of the wind energy controller, the photovoltaic controller, the rectifier and the oil generator are controlled according to preset rules based on the comparison results to utilize part of the capacity of the battery to store or release wind energy and light energy, and also include:

[0081] Step S2004, when the current voltage U of the DC bus is less than the battery backup voltage U1 and not less than the oil engine stop voltage U2 (U2≤U<U1); if the wind energy controller, photovoltaic controller and rectifier all have outputs, control the output voltage of the wind energy controller and the photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the oil engine to shut down; control the secondary load and the main load to power on. At this time, the rectifier does not charge the battery, and uses the wind energy controller and the photovoltaic controller to power the load and charge the battery, making full use of light energy and wind energy to reduce waste. At the same time, because the rectifier has output, it is determined whether there is an oil engine supplying power. If there is an oil engine supplying power, the oil engine is controlled to stop to avoid fuel waste. In addition, at this time, the power supply is sufficient, and the secondary load and the main load can be powered on, that is, Figure 2The switching devices K1 and K2 in are both closed.

[0082] Step S2005, if the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the secondary load and the main load to be powered on. Similarly, at this time, the wind energy controller and the photovoltaic controller are used to power the load and charge the battery, making full use of light energy and wind energy to reduce waste. At the same time, if the power supply is sufficient, both the secondary load and the main load can be powered on. Figure 2 The switching devices K1 and K2 in are both closed.

[0083] Step S2006, if the wind energy controller and the photovoltaic controller have no output, and the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the oil engine to shut down; control the secondary load and the main load to power on. At this time, the current voltage of the DC bus is less than the battery backup voltage, which means that the actual output voltage of the current battery is less than the battery backup voltage, which means that the battery power does not meet the battery backup time requirement, and the rectifier is needed to charge the battery. Control the rectifier output voltage to be equal to the battery backup voltage, and the rectifier will charge the battery so that the actual output voltage of the battery reaches the battery backup voltage. At the same time, because the rectifier has output, it is determined whether there is an oil engine supplying power. If there is an oil engine supplying power, control the oil engine to stop to avoid fuel waste. In addition, at this time, the power supply is sufficient, and both the secondary load and the main load can be powered on, that is, Figure 2 The switching devices K1 and K2 in are both closed.

[0084] The control method of the hybrid power supply in the embodiment of the present invention first compares the current voltage of the DC bus bar with the preset battery backup voltage and the oil engine stop voltage; then controls the working state of the wind energy controller, photovoltaic controller, rectifier and oil engine according to the comparison result and the preset rules, so as to use part of the capacity of the battery to store or release wind energy and light energy. That is, the present invention uses part of the battery capacity to store the electric energy converted from wind energy and light energy, and tries to recycle part of the battery capacity to power the load, making full use of wind energy and light energy, while avoiding the use of oil engines as much as possible to reduce fuel waste.

[0085] As an optional implementation, in an embodiment of the invention, see Figure 5 As shown, the control method of the hybrid power supply also includes:

[0086] Step S30, compare the current voltage of the DC bus bar with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage; wherein, the oil engine stop voltage>the oil engine starting voltage>the secondary load power-on voltage>the secondary load power-off voltage>the main load power-on voltage>the main load power-off voltage;

[0087] Step S3001, when the current voltage U of the DC bus is less than the oil engine stop voltage U2 and not less than the oil engine start voltage U3 (U3≤U<U2), if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and the photovoltaic controller to be equal to the battery equalizing charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the oil engine to keep starting; control the secondary load and the main load to power on.

[0088] Step S3002, if the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to remain shut down; control the secondary load and the main load to power on.

[0089] Step S3003, if the wind energy controller and the photovoltaic controller have no output, and the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on.

[0090] In the embodiment of the present invention, when the current voltage of the DC bus bar is less than the stop voltage of the oil engine and not less than the start voltage of the oil engine, because the current voltage of the DC bus bar is not less than the start voltage of the oil engine, the secondary load and the main load can be controlled to power on regardless of whether the rectifier has output.

[0091] As an optional implementation, in an embodiment of the invention, see Figure 6 As shown, the current voltage of the DC bus bar is also compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0092] Step S3004, when the current voltage U of the DC bus is less than the oil engine starting voltage U3 and not less than the secondary load power-on voltage U4 (U4≤U<U3), if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and the photovoltaic controller to be equal to the battery equalizing charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC power input, control the oil engine to keep starting; control the secondary load and the main load to power on.

[0093] Step S3005, if the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load and the main load to power on.

[0094] Step S3006, if the wind energy controller and the photovoltaic controller have no output, and the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on.

[0095] In the embodiment of the present invention, when the current voltage of the DC bus bar is less than the oil engine starting voltage and not less than the secondary load power-on voltage, the secondary load and the main load can be controlled to power on regardless of whether the rectifier has output, because the current voltage of the DC bus bar is not less than the secondary load power-on voltage. In addition, if the current voltage of the DC bus bar is less than the oil engine starting voltage and there is no AC input to make the rectifier output, it is recommended to start the oil engine to supply power to raise the current voltage of the DC bus bar.

[0096] As an optional implementation, in an embodiment of the invention, see Figure 7 As shown, the current voltage of the DC bus bar is also compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0097] Step S3007, when the current voltage U of the DC busbar is less than the secondary load power-on voltage U4 and not less than the secondary load power-off voltage U5 (U5≤U<U4), if the wind energy controller, photovoltaic controller and rectifier all have outputs, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0098] Steps S3005 and S3008: If the wind energy controller and / or the photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or the photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load to maintain the current state, and control the main load to power on;

[0099] Step S3009: If the wind energy controller and the photovoltaic controller have no output, but the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no mains input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0100] Step S3010, if the wind energy controller, the photovoltaic controller and the rectifier have no output, control the oil engine to start; control the secondary load to maintain the current state, and control the main load to power on.

[0101] In the embodiment of the present invention, when the current voltage of the DC bus bar is less than the power-on voltage of the secondary load and not less than the power-off voltage of the secondary load, because the current voltage of the DC bus bar is not less than the power-off voltage of the secondary load, as long as the rectifier has no output, the secondary load can be controlled to be powered on or off as needed, and the main load can be controlled to be powered on; if the rectifier has output, both the secondary load and the main load can be controlled to be powered on.

[0102] As an optional implementation, in an embodiment of the invention, see Figure 8 As shown, the current voltage of the DC bus bar is also compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0103] Step S3011, when the current voltage of the DC bus bar is less than the power-off voltage of the secondary load and not less than the power-on voltage of the main load (U6≤U<U5), if the wind energy controller, the photovoltaic controller and the rectifier all have outputs, control the output voltage of the wind energy controller and the photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0104] Step S3012: if the wind energy controller and / or the photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or the photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load to power off and control the primary load to power on;

[0105] Step S3013, if the wind energy controller and the photovoltaic controller have no output, and the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no mains input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0106] Step S3014, if the wind energy controller, the photovoltaic controller and the rectifier have no output, control the oil engine to start; control the secondary load to power off, and control the main load to power on.

[0107] In the embodiment of the present invention, when the current voltage of the DC bus bar is less than the power-off voltage of the secondary load and not less than the power-on voltage of the main load, as long as the rectifier has no output, the secondary load is controlled to be powered off, because the current voltage of the DC bus bar is not less than the power-on voltage of the main load, the main load can be controlled to be powered on; if the rectifier has output, both the secondary load and the main load can be controlled to be powered on.

[0108] As an optional implementation, in an embodiment of the invention, see Fig. 9As shown, the current voltage of the DC bus bar is also compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0109] Step S3015, when the current voltage of the DC bus bar is less than the main load power-on voltage and not less than the main load power-off voltage (U7≤U<U6), if the wind energy controller, photovoltaic controller and rectifier all have outputs, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0110] Step S3016: If the wind energy controller and / or the photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or the photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load to power off, and control the main load to maintain the current state;

[0111] Step S3017, if the wind energy controller and the photovoltaic controller have no output, and the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no mains input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0112] Step S3018, if the wind energy controller, the photovoltaic controller and the rectifier have no output, control the oil engine to start; control the secondary load to power off, and control the main load to maintain the current state.

[0113] In the embodiment of the present invention, when the current voltage of the DC bus bar is less than the power-on voltage of the main load and not less than the power-off voltage of the main load, it indicates that the energy supply of the DC bus bar is normal. As long as the rectifier has no output, the secondary load is controlled to be powered off. Because the current voltage of the DC bus bar is not less than the power-off voltage of the main load, the main load can be controlled to be powered on or off according to demand. If the rectifier has output, both the secondary load and the main load can be controlled to be powered on.

[0114] As an optional implementation, in an embodiment of the invention, see Fig.10 As shown, the current voltage of the DC bus bar is also compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, including:

[0115] Step S3019, when the current voltage U of the DC busbar is less than the power-on voltage U7 of the main load (U<U7), if the wind energy controller, the photovoltaic controller and the rectifier all have outputs, control the output voltage of the wind energy controller and the photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0116] Step S3020: If the wind energy controller and / or the photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or the photovoltaic controller to be equal to the battery equalization charging voltage; control the secondary load and the main load to power off;

[0117] Step S3021, if the wind energy controller and the photovoltaic controller have no output, and the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no mains input, control the diesel engine to keep starting; control the secondary load and the main load to power on;

[0118] Step S3022: If the wind energy controller, the photovoltaic controller and the rectifier have no output, the oil engine is controlled to start; the secondary load and the main load are controlled to power off.

[0119] In the embodiment of the present invention, when the current voltage of the DC bus bar is lower than the power-on voltage of the main load, it indicates that the energy supply of the DC bus bar is very limited. As long as the rectifier has no output, the secondary load and the main load are controlled to be powered off. If the rectifier has output, the secondary load and the main load can be controlled to be powered on.

[0120] As an optional implementation, in an embodiment of the invention, see Fig.11 As shown, the output voltage of the wind energy controller and the photovoltaic controller is controlled to be equal to the battery charging voltage, including:

[0121] Step S4001, if the sum of the output powers of the wind energy controller and the photovoltaic controller is greater than or equal to the sum of the load power and the maximum charging power of the battery, the wind energy controller and the photovoltaic controller are made to output at the maximum limited charging current.

[0122] Step S4002: If the sum of the output powers of the wind energy controller and the photovoltaic controller is less than the sum of the load power and the maximum charging power of the battery, the wind energy controller and the photovoltaic controller are enabled to output the maximum charging current that can be provided to the battery.

[0123] The embodiment of the present invention uses wind energy and light energy to charge the battery as much as possible, so that the wind energy and light energy are fully utilized.

[0124] See also Figure 2As shown, an embodiment of the present invention provides a control system of a hybrid power supply, including: a wind turbine, a photovoltaic power generation component, a mains power supply, a diesel engine, a wind energy controller, a photovoltaic controller, a rectifier, a main controller, and a battery.

[0125] The wind energy controller is connected to the wind turbine and the DC busbar, the photovoltaic controller is connected to the photovoltaic power generation assembly and the DC busbar, the rectifier is connected to the mains, the oil engine and the DC busbar, and the battery is connected to the DC busbar.

[0126] The main controller is connected to the wind energy controller, the photovoltaic controller, the rectifier and the oil generator, and is configured as follows:

[0127] Compare the current voltage of the DC bus bar with the preset battery backup voltage and the oil generator stop voltage; wherein the battery backup voltage is greater than the oil generator stop voltage;

[0128] According to the comparison result, wind energy and light energy are used as the control target with priority, and the working states of the wind energy controller, the photovoltaic controller, the rectifier and the oil engine are controlled according to preset rules to utilize part of the battery capacity to store or release wind energy and light energy.

[0129] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0130] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0131] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A control method for a hybrid power supply, characterized in that: The following steps are involved: Compare the current voltage of the DC bus bar with the preset battery backup voltage and the oil generator stop voltage; wherein the battery backup voltage is greater than the oil generator stop voltage; Based on the comparison results, the working states of the wind energy controller, photovoltaic controller, rectifier and oil generator are controlled according to preset rules to utilize part of the battery capacity to store or release wind energy and light energy.

2. The control method of the hybrid power supply according to claim 1, characterized in that: The method of controlling the working states of the wind energy controller, the photovoltaic controller, the rectifier and the oil generator according to the comparison result and the preset rules so as to utilize part of the capacity of the battery to store or release wind energy and light energy includes: When the current voltage of the DC busbar is not less than the battery backup voltage, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be less than or equal to the battery backup voltage; if there is no AC input, control the oil generator to shut down; control the secondary load and the main load to power on; If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, the output voltage of the wind energy controller and / or photovoltaic controller is controlled to be equal to the battery equalization charging voltage; the secondary load and the main load are controlled to be powered on; If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, the rectifier output voltage is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to shut down; the secondary load and the main load are controlled to power on.

3. The control method of the hybrid power supply according to claim 1, characterized in that: The method of controlling the working states of the wind energy controller, the photovoltaic controller, the rectifier and the oil generator according to the comparison result and the preset rules so as to utilize part of the capacity of the battery to store or release wind energy and light energy includes: When the current voltage of the DC busbar is less than the battery backup voltage and not less than the oil generator stop voltage, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the oil generator to stop; control the secondary load and the main load to power on; If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, the output voltage of the wind energy controller and / or photovoltaic controller is controlled to be equal to the battery equalization charging voltage; the secondary load and the main load are controlled to be powered on; If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, the rectifier output voltage is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to shut down; the secondary load and the main load are controlled to power on.

4. The control method of the hybrid power supply according to claim 1, characterized in that: Also includes: The current voltage of the DC busbar is also compared with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage; wherein, the oil engine stop voltage> the oil engine starting voltage> the secondary load power-on voltage> the secondary load power-off voltage> the main load power-on voltage> the main load power-off voltage; When the current voltage of the DC busbar is less than the stop voltage of the oil generator and not less than the start voltage of the oil generator, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the oil generator to keep starting; control the secondary load and the main load to power on; If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, the output voltage of the wind energy controller and / or photovoltaic controller is controlled to be equal to the battery equalization charging voltage; the secondary load and the main load are controlled to be powered on; If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, the rectifier output voltage is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to keep starting; the secondary load and the main load are controlled to power on.

5. The control method of the hybrid power supply according to claim 4, characterized in that: After comparing the current voltage of the DC bus bar with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, the method further comprises: When the current voltage of the DC busbar is less than the starting voltage of the oil generator and not less than the power-on voltage of the secondary load, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the oil generator to keep starting; control the secondary load and the main load to power on; If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load and the main load to power on; If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, the rectifier output voltage is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to keep starting; the secondary load and the main load are controlled to power on.

6. The control method of the hybrid power supply according to claim 4, characterized in that: After comparing the current voltage of the DC bus bar with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, the method further comprises: When the current voltage of the DC busbar is less than the secondary load power-on voltage and not less than the secondary load power-off voltage, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on; If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load to maintain the current state, and control the main load to power on; If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and main load to power on; If the wind energy controller, photovoltaic controller and rectifier have no output, the oil engine is controlled to start; the secondary load is controlled to maintain the current state, and the main load is controlled to power on.

7. The control method of the hybrid power supply according to claim 4, characterized in that: After comparing the current voltage of the DC bus bar with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, the method further comprises: When the current voltage of the DC busbar is less than the power-off voltage of the secondary load and not less than the power-on voltage of the main load, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on; If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load to power off and control the main load to power on; If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and main load to power on; If the wind energy controller, photovoltaic controller and rectifier have no output, control the oil engine to start; control the secondary load to power off, and control the main load to power on.

8. The control method of the hybrid power supply according to claim 4, characterized in that: After comparing the current voltage of the DC bus bar with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, the method further comprises: When the current voltage of the DC busbar is less than the power-on voltage of the main load and not less than the power-off voltage of the main load, if the wind energy controller, photovoltaic controller and rectifier all have output, control the output voltage of the wind energy controller and photovoltaic controller to be equal to the battery equalization charging voltage, and control the output voltage of the rectifier to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and the main load to power on; If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load to power off, and control the main load to maintain the current state; If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and main load to power on; If the wind energy controller, photovoltaic controller and rectifier have no output, the oil engine is controlled to start; the secondary load is controlled to power off, and the main load is controlled to maintain the current state.

9. The control method of the hybrid power supply according to claim 4, characterized in that: After comparing the current voltage of the DC bus bar with the preset oil engine starting voltage, the secondary load power-on voltage, the secondary load power-off voltage, the main load power-on voltage, and the main load power-off voltage, the method further comprises: When the current voltage of the DC busbar is lower than the power-off voltage of the main load, if the wind energy controller, photovoltaic controller and rectifier all have output, the output voltage of the wind energy controller and photovoltaic controller is controlled to be equal to the battery equalization charging voltage, and the output voltage of the rectifier is controlled to be equal to the battery backup voltage; if there is no AC input, the diesel engine is controlled to keep starting; the secondary load and the main load are controlled to power on; If the wind energy controller and / or photovoltaic controller has output and the rectifier has no output, control the output voltage of the wind energy controller and / or photovoltaic controller to be equal to the battery equalization charging voltage; control the diesel engine to start; control the secondary load and the main load to power off; If the wind energy controller and photovoltaic controller have no output, but the rectifier has output, control the rectifier output voltage to be equal to the battery backup voltage; if there is no AC input, control the diesel engine to keep starting; control the secondary load and main load to power on; If the wind energy controller, photovoltaic controller and rectifier have no output, the oil generator is controlled to start; the secondary load and main load are controlled to power off.

10. The control method of the hybrid power supply according to any one of claims 2 to 9, characterized in that: The control of the output voltage of the wind energy controller and the photovoltaic controller to be equal to the battery equalization charging voltage comprises: If the sum of the output power of the wind energy controller and the photovoltaic controller is greater than or equal to the sum of the load power and the maximum charging power of the battery, the wind energy controller and the photovoltaic controller are output at the maximum limited charging current; If the sum of the output powers of the wind energy controller and the photovoltaic controller is less than the sum of the load power and the maximum charging power of the battery, the wind energy controller and the photovoltaic controller are made to output the maximum charging current that can be provided to the battery.

11. A control system for a hybrid power supply, characterized in that: include: Wind energy controllers, photovoltaic controllers, rectifiers and main controllers; The wind energy controller is connected to the wind turbine and the DC busbar, the photovoltaic controller is connected to the photovoltaic power generation assembly and the DC busbar, the rectifier is connected to the mains, the oil generator and the DC busbar, and the battery is connected to the DC busbar; The main controller is connected to the wind energy controller, the photovoltaic controller, the rectifier and the oil generator, and is configured as follows: Compare the current voltage of the DC bus bar with the preset battery backup voltage and the oil generator stop voltage; wherein the battery backup voltage is greater than the oil generator stop voltage; According to the comparison result, the working states of the wind energy controller, the photovoltaic controller, the rectifier and the oil engine are controlled according to preset rules, so as to utilize part of the capacity of the battery to store or release wind energy and light energy.

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