Energy control system, energy control method and related device

Abstract

The invention discloses an energy control system, an energy control method and a related device, and relates to the field of water heater power supply. In the application, the alternating current conversion unit is used for converting the alternating current output by the power grid into the first electric energy, the power optimization unit is used for converting the electric energy output by the photovoltaic module into the second electric energy, the coupling unit couples the first electric energy and the second electric energy to obtain the total electric energy, and the total electric energy is output to the water heater. And a heating body in the water heater performs heating operation by using the total electric energy. According to the photovoltaic water heater, the electric energy generated by the photovoltaic module and the electric energy of the power grid are utilized to heat the water heater at the same time through the alternating current conversion unit, the power optimization unit, the coupling unit and other components, and due to control of the power optimization unit, the photovoltaic module works in the maximum power point state. In addition, the water heater is heated after the photovoltaic electric energy and the power grid electric energy are coupled, so that the heating operation of the water heater can be realized only by using one heating body, the number of the heating bodies is reduced, and the cost is saved.

Description

Technical Field

[0001] The present application relates to the field of power supply, and more specifically, to an energy control system, an energy control method and related devices. Background Art

[0002] In actual scenarios, grid power is generally used to power electrical equipment. For example, if the electrical equipment is a water heater, grid power is used to heat the water heater. However, with the development of photovoltaic modules, photovoltaic modules can use solar energy to generate electricity, which can also be used to power electrical equipment.

[0003] Then, when both the photovoltaic modules and the power grid are able to provide electrical energy to the electrical equipment, how to perform the power supply operation at this time is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] In view of this, the present application provides an energy control system, an energy control method and related devices to solve the problem of urgently needing to use photovoltaic components and power grids to simultaneously power electrical equipment.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] An energy control system, comprising:

[0007] An AC conversion unit, a power optimization unit, a coupling unit and a controller; the AC conversion unit and the power optimization unit are respectively connected to the coupling unit, and the controller is respectively connected to the AC conversion unit, the power optimization unit and the coupling unit for communication;

[0008] The AC conversion unit is used to convert the AC power output by the power grid into the first electric energy based on the control of the controller;

[0009] The power optimization unit is used to convert the electric energy output by the photovoltaic assembly into the second electric energy based on the control of the controller;

[0010] The coupling unit is used to couple the first electric energy and the second electric energy to obtain total electric energy, and output the total electric energy to an electric device.

[0011] Optionally, the energy control system further includes:

[0012] An active heating regulating unit located between the coupling unit and the electrical device;

[0013] The active heating regulation unit is used to regulate the voltage value outputted from the coupling unit to the electrical device, so as to achieve stepless heating regulation of the electrical device.

[0014] Optionally, the AC conversion unit includes: a controllable conversion unit or a non-controllable conversion unit;

[0015] The controllable conversion unit includes an industrial frequency rectification conversion circuit or a high-frequency chopping conversion circuit constructed by active switching devices;

[0016] The non-controllable conversion unit includes a rectifier or a rectifier circuit constructed by discrete devices.

[0017] Optionally, the power electronic converter in the power optimization unit adopts an isolated topology structure or a non-isolated topology structure.

[0018] Optionally, the coupling unit includes a capacitor.

[0019] Optionally, the photovoltaic modules are connected in parallel to the power optimization unit.

[0020] An energy system comprises the above energy control system and electrical equipment.

[0021] An energy control method is applied to a controller in the above energy control system, and the energy control method comprises:

[0022] The AC conversion unit is controlled to convert the AC power output by the power grid into the first electric energy, and the power optimization unit is controlled to convert the electric energy output by the photovoltaic module into the second electric energy; the first electric energy and the second electric energy are respectively output to the coupling unit, and the coupling unit couples the first electric energy and the second electric energy to obtain the total electric energy, and outputs the total electric energy to the power-consuming equipment.

[0023] Optionally, controlling the AC conversion unit to convert the AC power outputted by the power grid into the first electric energy, and controlling the power optimization unit to convert the electric energy outputted by the photovoltaic module into the second electric energy, comprises:

[0024] Get the current parameters of the electrical equipment;

[0025] Controlling the AC conversion unit to operate so that the AC conversion unit converts the AC power output by the power grid into the first electric energy;

[0026] After the voltage of the coupling unit is stabilized, controlling the power optimization unit to operate so that the power optimization unit converts the electric energy output by the photovoltaic assembly into the second electric energy;

[0027] The operating state of at least one of the AC conversion unit and the power optimization unit is adjusted to adjust the magnitudes of the first electric energy and the second electric energy.

[0028] Optionally, obtain current parameters of the power-consuming device, including:

[0029] When the current parameter is less than the first parameter threshold or an operation instruction is received, the current parameter of the electric device is obtained.

[0030] Optionally, adjusting the operating state of at least one of the AC conversion unit and the power optimization unit includes:

[0031] Obtaining operating parameters of electrical equipment during operation;

[0032] According to the operating parameters, the operating power of the power optimization unit is adjusted until the power of the photovoltaic module reaches a maximum power point.

[0033] Optionally, after adjusting the operating power of the power optimization unit according to the operating parameter, the method further includes:

[0034] According to the voltage value of the second electric energy output by the power optimization unit, the current value of the first electric energy output by the AC conversion unit is adjusted so that the voltage of the coupling unit is a fixed value.

[0035] Optionally, after controlling the AC conversion unit to convert the AC power outputted by the power grid into the first electric energy, and controlling the power optimization unit to convert the electric energy outputted by the photovoltaic assembly into the second electric energy, the method further includes:

[0036] When the current parameter of the electric device reaches the second parameter threshold, the AC conversion unit and the power optimization unit are controlled to stop running.

[0037] Optionally, after controlling the AC conversion unit to convert the AC power outputted by the power grid into the first electric energy, and controlling the power optimization unit to convert the electric energy outputted by the photovoltaic assembly into the second electric energy, the method further includes:

[0038] The active heating regulation unit is controlled to regulate the voltage value outputted from the coupling unit to the electrical device, so as to realize stepless heating regulation of the electrical device.

[0039] An energy conversion device is used to execute the above energy control method.

[0040] The present application discloses an energy control system, an energy control method and related devices. In the present application, an AC conversion unit is used to convert the AC power outputted by the power grid into a first electric energy, a power optimization unit is used to convert the electric energy outputted by the photovoltaic module into a second electric energy, a coupling unit couples the first electric energy and the second electric energy to obtain a total electric energy, and the total electric energy is output to the power-consuming device. That is, the present application realizes the simultaneous use of the electric energy generated by the photovoltaic module and the electric energy of the power grid to power the power-consuming device through components such as the AC conversion unit, the power optimization unit and the coupling unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0042] Figure 1 It is a structural schematic diagram of an energy system in the related art;

[0043] Figure 2 A schematic diagram of the structure of an energy control system provided in an embodiment of the present application;

[0044] Figure 3 A control logic diagram of an energy control system provided in an embodiment of the present application;

[0045] Figure 4 A schematic diagram of the structure of another energy control system provided in an embodiment of the present application;

[0046] Figure 5 A control logic diagram of another energy control system provided in an embodiment of the present application;

[0047] Figure 6 A flow chart of a heating control process provided in an embodiment of the present application;

[0048] Figure 7 A waveform diagram of a heating control process provided in an embodiment of the present application;

[0049] Figure 8 A waveform diagram of another heating control process provided in an embodiment of the present application;

[0050] Fig. 9 A flow chart of an energy control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] In actual scenarios, grid power is generally used to power electrical equipment. For example, if the electrical equipment is a water heater, grid power is generally used to heat the water heater. However, with the development of photovoltaic modules, photovoltaic modules can use solar energy to generate electricity, which can also be used to heat the water heater.

[0053] Then, when both the photovoltaic modules and the power grid are able to supply power to electrical equipment, such as providing power to a water heater, how to perform the power supply operation is a technical problem that needs to be solved urgently by those skilled in the art.

[0054] In the related technology, taking the electrical equipment as a water heater as an example, the current photovoltaic water heater architecture is a dual heating structure with separate power supply and operation on the photovoltaic DC side and the grid AC side, and the photovoltaic module does not control the output and is not in the best working state. The specific implementation can be achieved by Figure 1 The structure shown utilizes both the electricity generated by the photovoltaic modules and the electricity from the grid to perform water heater heating operations.

[0055] Figure 1 In the example, the water heater is provided with two heating bodies, namely the DC heating body and the AC heating body. On the DC heating body side, the photovoltaic modules are connected in series, and the electric energy generated by the photovoltaic modules in the photovoltaic panels is collected together through the junction box and then output to the DC heating body for heating. On the AC heating body side, the electric energy generated by the power grid is output to the AC heating body through the control switch. At this time, the DC heating body and the AC heating body heat the water heater at the same time, realizing the dual heating of cold water.

[0056] against Figure 1 The heating structure has the following technical defects:

[0057] 1. The DC side and AC side are completely separated, and two sets of heating elements need to be configured. The heating elements are redundant, which increases the system cost;

[0058] 2. The photovoltaic panels on the DC side must be connected in series to form high-voltage DC. The combiner box only controls the on-off of the high-voltage DC, resulting in low photovoltaic efficiency and failure to maximize the performance of the photovoltaic modules.

[0059] 3. The DC side is directly connected to the heating element without isolation. Long-term operation may cause the risk of DC and AC short circuit, which may lead to high safety risk of electricity use.

[0060] 4. There is no direct coupling between the DC side and the AC side, which cannot effectively regulate the power consumption of the grid and has low economic benefits. And because the photovoltaic panels are uncontrolled power generation, the power generation efficiency of the photovoltaic panels is not maximized.

[0061] To this end, the embodiment of the present application proposes a single heating body architecture based on flexible AC-DC coupling, which couples photovoltaic power and grid power, realizes direct DC and AC coupling output in a single heating body, and the two coordinate power output to improve economic efficiency. In addition, after the two are coupled, the number of heating bodies is reduced, which improves the cost advantage of the system.

[0062] In addition, the output power of photovoltaic modules is actively optimized to ensure that the photovoltaic modules operate at the maximum power point, which greatly improves the utilization rate of photovoltaic modules and achieves the maximum energy output on the photovoltaic module side.

[0063] In addition, electrical isolation is achieved between the photovoltaic DC low voltage and the grid AC high voltage, which improves the safety of equipment operation.

[0064] In addition, according to the thermal energy demand, the power on the DC side and AC side is adjusted to achieve optimal thermal energy control.

[0065] Based on the above content, an embodiment of the present application provides an energy control system, which can be called a heat energy management system (Heart Energy Management Systerm, HEMS). Figure 2 , the energy control system may include:

[0066] An AC conversion unit 11 , a power optimization unit 12 , a coupling unit 13 and a controller 14 ; the AC conversion unit 11 and the power optimization unit 12 are connected to the coupling unit 13 respectively.

[0067] In addition, the controller 14 is connected to the AC conversion unit 11, the power optimization unit 12 and the coupling unit 13 for communication. Figure 2 Through the communication connection, the controller 14 can obtain the operating data of the AC conversion unit 11, the power optimization unit 12, and the coupling unit 13, so as to adjust the operating status of the AC conversion unit 11 and the power optimization unit 12.

[0068] In actual scenarios, the AC conversion unit 11 is connected to the power grid, and based on the control of the controller, converts the AC power output from the power grid into the first electric energy. More specifically, the AC conversion unit 11 converts the AC power of the power grid into DC power through a power electronic converter and outputs it to the coupling unit.

[0069] In one implementation, the AC conversion unit 11 includes: a controllable conversion unit or an uncontrollable conversion unit.

[0070] The controllable conversion unit includes an industrial frequency rectifier conversion circuit or a high frequency chopper conversion circuit constructed by active switching devices; the uncontrollable conversion unit includes a rectifier or a rectifier circuit constructed by discrete devices. In one implementation, an uncontrollable conversion unit can be selected for cost considerations. If cost is not considered, one of the controllable conversion unit and the uncontrollable conversion unit can be selected.

[0071] The power optimization unit 12 is connected to the photovoltaic modules (PV+ and PV- represent the positive and negative poles respectively). The photovoltaic modules mainly convert solar energy into electrical energy. The number of photovoltaic modules is based on the actual configuration. In actual scenarios, if the photovoltaic modules are connected in series, the voltage of the photovoltaic modules after series connection is higher. If there is a risk of electric shock later, it will have a greater impact on human safety. Therefore, in one implementation of the present application, the photovoltaic modules are connected in parallel and connected to the power optimization unit 12. After the photovoltaic modules are connected in parallel, the parallel current is larger and the parallel voltage does not change. Therefore, the impact on human safety in the event of subsequent electric shock can be avoided. In addition, the parallel connection of photovoltaic modules is also more suitable for low-power application scenarios such as homes.

[0072] In one implementation, the power electronic converter in the power optimization unit 12 adopts an isolated topology or a non-isolated topology. Specifically, the power optimization unit 12 adjusts the working state of the photovoltaic module through the power electronic converter to keep the photovoltaic module at the maximum power point. The power electronic converter can be an isolated topology to ensure the electrical isolation of the photovoltaic module and the HEMS and the product contactable shell, and achieve safer electrical contact. Its conventional topologies mainly include flyback converter Flyback, LLC (LLC resonant converter), DAB (Dual Active Bridge, dual active bridge converter), CLLLC (CLLC resonant converter), dual-tube forward, etc. At the same time, the power electronic converter can also be a non-isolated topology. Common topologies mainly include boost chopper Boost, buck Buck, FSBB (Four Switching BuckBoost four-tube Buck Boost), etc. Which structure to choose specifically can be based on actual configuration.

[0073] After the photovoltaic modules are connected in parallel, the AC power is output to the power optimization unit 12, which converts the AC power to obtain the second power. Meanwhile, the AC conversion unit 11 converts the AC power output from the power grid into the first power.

[0074] Since the AC conversion unit 11 and the power optimization unit 12 are connected to the coupling unit 13, the AC conversion unit 11 outputs the first electric energy to the coupling unit 13, the power optimization unit 12 outputs the second electric energy to the coupling unit 13, and the coupling unit 13 couples the first electric energy and the second electric energy to obtain the total electric energy.

[0075] In one implementation, the coupling unit 13 includes a capacitor, and specifically couples the energy output by the power optimization unit 12 and the AC conversion unit 11 through a device such as a capacitor that couples energy, that is, combines the photovoltaic solar energy and the power grid electric energy for unified allocation and management. The coupling unit 13 has active adaptability, and can achieve mutual compensation between photovoltaic output energy and power grid output energy, and can meet all-weather electricity demand, without the need for human intervention in the operation mode and automatically executes in a mode that prioritizes photovoltaic output electric energy.

[0076] The coupling unit 13 outputs the total electric energy to the electric device. The electric device can be any one or more devices that need to use electric energy, such as a water heater, an induction cooker, a washing machine, an oxygen generator, a television, etc. In one implementation, taking the electric device as a water heater as an example, the water heater is a water storage device containing a heating body, and the electricity is taken from the coupling unit 13 and output to the heating body, so that the heating body in the water heater uses the total electric energy for heating operation, thereby realizing the heating of cold water. During the heating process of the heating body, the water temperature will be transmitted to the controller 14 in the HEMS.

[0077] The operation process of the power optimization unit 12 and the AC conversion unit 11 needs to be controlled by the controller 14. The specific control logic can be referred to Figure 3 shown.

[0078] The controller 14 has a built-in HEMS control program as a core computing and scheduling unit. The HEMS control program integrates data and instruction collection, control and protection of each unit, and energy allocation to comprehensively realize hybrid heating of the water heater by photovoltaics and the power grid.

[0079] The HEMS control program can obtain a thermal energy reference value. In one implementation, the thermal energy reference value is the maximum water temperature value set by the user, such as 50°C, 60°C, etc. In addition, during the process of the heating body heating to generate thermal energy, the HEMS control program can also collect the heat of the thermal energy and the water temperature of the water in the current water heater.

[0080] In addition, the HEMS control program can also collect data such as the voltage and current of the photovoltaic module, the grid voltage, the output current of the power optimization unit 12, the output current of the AC conversion unit 11, the voltage of the coupling unit 13, the voltage at both ends of the heating body, the current flowing through the heating body, the temperature of the heating body, the water temperature, the water volume, etc., and use the above data to intelligently determine the optimal power output of the power optimization unit 12, perform power control on the power optimization unit 12, and achieve the maximum power output of the photovoltaic module. At the same time, the output of the AC conversion unit 11 is automatically adjusted according to the required heat to change the energy obtained from the power grid, thereby ensuring that the electric energy required for electric heating comes mainly from solar energy, thereby achieving better economic benefits.

[0081] In this embodiment, the AC conversion unit is used to convert the AC power output by the power grid into the first electric energy, the power optimization unit is used to convert the electric energy output by the photovoltaic module into the second electric energy, the coupling unit couples the first electric energy and the second electric energy to obtain the total electric energy, and the total electric energy is output to the electrical equipment, such as a water heater, so that the heating body in the water heater uses the total electric energy for heating operation. That is, the present application realizes the simultaneous use of the electric energy generated by the photovoltaic module and the power of the power grid to power the electrical equipment through components such as the AC conversion unit, the power optimization unit and the coupling unit. In addition, since the photovoltaic power and the power grid are coupled to heat the water heater, the heating operation of the water heater can be realized by using only one heating body, which reduces the number of heating bodies and saves costs.

[0082] In addition, through the electrical isolation design of the power optimization unit 12, electrical isolation between the photovoltaic DC low voltage and the grid AC high voltage is achieved, which improves the safety of equipment operation and reduces the risk of electric shock to the equipment.

[0083] In addition, photovoltaic heating and AC heating share the same heating body through a coupling unit, which reduces the number of heating bodies and improves the cost advantage of the system.

[0084] Based on the structure of the above energy control system, Figure 4 As shown, the energy control system may further include a heating active regulation unit 15 located between the coupling unit and the water heater.

[0085] In actual scenarios, the heating element in the above water heater is a resistive passive heating element, that is, when electrical energy (voltage, current and power) is input to the heating element, the heating element performs heating operation according to the electrical energy and does not have an active adjustment function. Figure 2 On the basis of the active heating regulating unit 15, the active heating regulating unit 15 is added. The input end of the active heating regulating unit 15 is connected to the output end of the coupling unit 13, and the output end of the active heating regulating unit 15 is connected to the heating body, so that electric energy can be input into the heating body.

[0086] In actual scenarios, the active heating regulation unit 15 is used to regulate the voltage value output by the coupling unit 13 to the electrical device to achieve stepless heating regulation of the electrical device, such as achieving stepless heating regulation of the heating body in a water heater.

[0087] To elaborate, taking a water heater as an example, the heating active regulating unit 15 is controlled by the HEMS control program, which requires the HEMS control program to have more energy-saving considerations for the heating of the heating body. When the water temperature is close to the set temperature, the heating active regulating unit 15 is used to change the temperature of the heating body, thereby saving electric energy obtained from the power grid, and also enabling the heating body to achieve stepless temperature regulation.

[0088] Specifically, the HEMS control program can send an initial voltage value and a voltage change gradient. For example, if the voltage output by the coupling unit 13 to the heating active adjustment unit 15 is 300V, at this time, the current water temperature is close to the temperature value set by the user. Therefore, if 300V is used to heat the heating body, the temperature will rise rapidly and it is easy to exceed the temperature value set by the user. Therefore, the HEMS control program can calculate an initial voltage value and a voltage change gradient according to the difference between the current temperature and the temperature value set by the user. For example, the initial voltage value can be 100V, and the voltage change gradient is -0.1V. At this time, after receiving the 300V voltage output by the coupling unit 13, the heating active adjustment unit 15 does not output all the 300V voltage to the heating body, but only outputs 100V of the voltage to the heating body, and the voltage output to the heating body gradually decreases according to the gradient of -0.1V, such as 99.9V in the next cycle, 99.8V in the next cycle..., as the voltage continues to decrease, the heating temperature of the heating body increases slowly, and then it can gradually approach the temperature value set by the user when it is close to the temperature value set by the user, so as to avoid the situation where the temperature exceeds the set value. In addition, since the voltage change gradient set in the present application is small, the temperature of the heating body can be slowly increased to achieve stepless temperature regulation, and avoid the situation where the temperature exceeds the set value due to large temperature changes.

[0089] When the heating active regulation unit 15 is used to regulate the voltage of the heating body, since the voltage required by the heating body is reduced, the electric energy from the grid side can be reduced, that is, the output electric energy of the AC conversion unit 11 can be reduced. At this time, the theoretical voltage value of the first electric energy output by the AC conversion unit 11 can be calculated using the grid voltage, the output current of the power optimization unit 12, the output current of the AC conversion unit 11, the voltage of the coupling unit 13, the voltage at both ends of the heating body, the current flowing through the heating body, the temperature of the heating body, the water temperature, the water volume and other data, and the voltage of the first electric energy output by the AC conversion unit 11 can be adjusted according to the theoretical voltage value.

[0090] In an implementation of the present application, after adding a heating active adjustment unit to the energy control system, the corresponding control logic will also change. Figure 5 shown.

[0091] At this time, the heating active regulation unit is arranged between the coupling unit and the heating body, and the voltage outputted from the coupling unit to the heating body is adjusted, so as to realize the stepless regulation of the temperature. The heating active regulation unit can communicate with the HEMS control program, so that the HEMS control program controls the voltage regulation process of the heating active regulation unit. The rest of the control logic refers to the corresponding description above.

[0092] Based on the structure of the above energy control system, another embodiment of the present application provides an energy system, including the above energy control system and electrical equipment. Figure 2 and 4 shown.

[0093] Based on the structure of the above energy control system, another embodiment of the present application provides an energy control method, which is applied to the controller in the above energy control system. The energy control method may include:

[0094] The AC conversion unit is controlled to convert the AC power output by the power grid into the first electric energy, and the power optimization unit is controlled to convert the electric energy output by the photovoltaic module into the second electric energy.

[0095] The first electric energy and the second electric energy are respectively output to a coupling unit, and the coupling unit couples the first electric energy and the second electric energy to obtain total electric energy, and outputs the total electric energy to an electrical device, such as a water heater, so that a heating body in the water heater performs heating operation using the total electric energy.

[0096] The controller in the embodiment of the present application, specifically the specific implementation of the HEMS control program in the controller, refers to the above corresponding instructions.

[0097] In one implementation of the present application, refer to Figure 6 , controlling the AC conversion unit to convert the AC power outputted by the power grid into the first electric energy, and controlling the power optimization unit to convert the electric energy outputted by the photovoltaic module into the second electric energy, may include:

[0098] S11. Obtain current parameters of electrical equipment.

[0099] Taking the water heater as an example, the current water temperature of the water heater can be obtained. In the actual scenario, the current water temperature of the water heater is the temperature of the water in the water heater when the heating body starts to heat.

[0100] In one implementation, when the current parameter is less than a first parameter threshold or an operation instruction is received, the current parameter of the electric device is obtained.

[0101] Taking a water heater as an example, the current parameter may be the current water temperature, the first parameter threshold may be the first water temperature threshold, and the operation instruction may be a heating instruction.

[0102] Generally, the water heater can be set to automatic heating or manual heating. In automatic heating, when the water temperature of the water heater is lower than the first water temperature threshold (the first water temperature threshold is a minimum temperature value, which can be set, such as 20°C), the water heater can automatically heat up. In addition, if the user manually clicks the heating button, it is considered that the heating instruction has been received, and the water heater also starts heating.

[0103] Therefore, when the current water temperature is less than the first water temperature threshold or a heating instruction is received, the current water temperature of the water heater can be obtained.

[0104] In addition, when the water heater is heating, the user may also set a second water temperature threshold, which is a maximum temperature value. If the temperature of the water in the water heater reaches the second water temperature threshold, heating may be stopped.

[0105] S12. Control the operation of the AC conversion unit so that the AC conversion unit converts the AC power output by the power grid into first electric energy.

[0106] Wherein, the first electric energy is output to the water heater through the coupling unit.

[0107] Specifically, when the water heater starts to heat, the coupling unit needs to provide a fixed voltage value to the heating body. This voltage value is the DC voltage value obtained by the coupling unit from the power grid. Therefore, when the water heater starts to heat, the AC conversion unit is first controlled to start working. The AC conversion unit converts the sinusoidal voltage of the power grid into DC (i.e., the first electrical energy) and converts it into DC voltage in the coupling unit. The DC voltage is output to the heating body. After the voltage of the coupling unit is stabilized, the output waveform of the AC conversion unit is shown in FIG. Figure 7 .

[0108] After the voltage of the coupling unit is established, the HEMS control program starts to instruct the coupling unit and the heating body to heat. At this time, the energy of the heating body all comes from the power grid, and the voltage of the coupling unit remains stable.

[0109] S13. After the voltage of the coupling unit is stabilized, control the power optimization unit to operate so that the power optimization unit converts the electric energy output by the photovoltaic assembly into second electric energy.

[0110] After the voltage of the coupling unit is stabilized, the HEMS control program instructs the power optimization unit to start working, the photovoltaic component starts to output energy to the power optimization unit, and the power optimization unit converts the electric energy output by the photovoltaic component into second electric energy and outputs it to the coupling unit.

[0111] S14. Adjust the operating state of at least one of the AC conversion unit and the power optimization unit to adjust the magnitudes of the first electric energy and the second electric energy.

[0112] In actual scenarios, when the photovoltaic module starts to generate electricity, it has not reached the maximum power point, and the power generation energy is not optimal at this time. In order to optimize the power generation capacity of the photovoltaic module, the photovoltaic module will be controlled to reach the maximum power point in the embodiment of the present application.

[0113] The HEMS control program will adjust the operating state of the power optimization unit to adjust the power of the photovoltaic module. In addition, in order to ensure the voltage stability of the coupling unit, the output power of the AC conversion unit will also be adjusted.

[0114] In one implementation, when adjusting the operating state of the power optimization unit, it may be:

[0115] The operating parameters of the power-consuming device are obtained during operation, and the operating power of the power optimization unit is adjusted according to the operating parameters until the power of the photovoltaic module reaches a maximum power point (MPP).

[0116] Taking a water heater as an example, the operating parameters of the electrical equipment during operation are the operating parameters of the water heater during heating. The operating parameters of the water heater during heating can be as follows:

[0117] Data such as voltage and current of photovoltaic modules.

[0118] After the above operating parameters are collected through the communication architecture, the above data can be used to adopt a preset algorithm to intelligently determine the optimal power output of the power optimization unit and perform power control on the power optimization unit until the power of the photovoltaic module reaches the maximum power point.

[0119] In the process of continuously adjusting the operating state of the power optimization unit, the power optimization unit converts the electric energy output by the photovoltaic module into the second electric energy. The voltage of the second electric energy output by the power optimization unit will change, generally gradually increasing. At this time, outputting the second electric energy to the coupling unit will cause the voltage of the coupling unit to rise and cannot be stabilized at a fixed value. At this time, it is necessary to control the AC conversion unit so that the voltage of the coupling unit is stabilized at a fixed value.

[0120] In actual scenarios, if the AC conversion unit is a non-controllable conversion unit, its output energy will automatically decrease due to the increase in the coupling unit voltage, so that the coupling unit voltage remains stable. The current flowing through the AC conversion unit changes before and after. Figure 8 .

[0121] If the AC conversion unit is a controllable industrial frequency rectifier conversion circuit, the change trend of its output energy is consistent with the change trend of the uncontrollable conversion unit. If the AC conversion unit is a controllable high-frequency chopper conversion circuit, the AC conversion unit can be controlled by HEMS to actively reduce the output energy to keep the coupling unit voltage stable.

[0122] Then in an implementation of the present application, after adjusting the operating power of the power optimization unit according to the operating parameter, the method further includes:

[0123] According to the voltage value of the second electric energy output by the power optimization unit, the current value of the first electric energy output by the AC conversion unit is adjusted so that the voltage of the coupling unit is a fixed value.

[0124] Specifically, since the fixed voltage value of the coupling unit when it is stable is known, the voltage value of the second electric energy output by the power optimization unit can be obtained through communication collection. Since the voltage value of the coupling unit is determined by the voltage value of the first electric energy and the voltage value of the second electric energy, the fixed voltage value of the coupling unit and the actual voltage value of the second electric energy are directly used to obtain the theoretical voltage value of the first electric energy, and then the theoretical voltage value of the first electric energy is used to adjust the current value of the first electric energy output by the AC conversion unit, so that the voltage of the coupling unit is stabilized at a fixed value, and then the voltage output by the coupling unit to the heating body is stabilized, thereby improving the reliability of heating of the heating body.

[0125] As the energy output by the photovoltaic module increases, the power optimization unit outputs more and more energy to the coupling unit. Since the voltage of the coupling unit is fixed, the energy given to the coupling unit by the AC conversion unit becomes less and less, until the photovoltaic module reaches the maximum power point, the energy output by the power optimization unit is fixed, and the energy output by the AC conversion unit no longer changes. During this process, the voltage of the coupling unit is always maintained in a dynamic balance. At this time, the photovoltaic module is fully utilized and the electricity obtained from the power grid is the least, further increasing the proportion of green electricity used in the system. In some cases, HEMS is used to adjust and only the energy emitted by the photovoltaic module is used to provide electricity for the heating body.

[0126] In this embodiment, the adaptability of the coupling unit ensures that the heating body uses the energy of photovoltaic power generation as much as possible, thereby increasing the proportion of green electricity used in the system and making the system more low-carbon and environmentally friendly. In addition, the HEMS control function makes the energy allocation of the energy control system more intelligent and efficient, saving users more electricity costs and bringing users more convenient interaction and experience.

[0127] On the basis of the above embodiment, as the heating body is continuously heated, the temperature of the water in the water heater becomes higher and higher, gradually approaching the second water temperature threshold set by the user. At this time, in order to make the water temperature gradually approach the second water temperature threshold and not exceed the second water temperature threshold, in an implementation of the present application, after controlling the AC conversion unit to convert the AC power output by the power grid into the first electric energy, and controlling the power optimization unit to convert the electric energy output by the photovoltaic module into the second electric energy, it also includes:

[0128] The active heating regulating unit is controlled to regulate the voltage value outputted from the coupling unit to the water heater, so as to realize the stepless heating regulation of the electric device, such as the heating body in the water heater. The specific implementation process refers to the corresponding description above.

[0129] It should be noted that when the heating active adjustment unit is not used, the current of the first electric energy output by the AC conversion unit is adjusted in accordance with the above-mentioned method of "using the fixed voltage value of the coupling unit and the actual voltage value of the second electric energy to obtain the theoretical voltage value of the first electric energy, and then using the theoretical voltage value of the first electric energy to adjust the current value of the first electric energy output by the AC conversion unit". When the heating active adjustment unit is used to control the voltage of the heating body, the theoretical voltage value of the first electric energy output by the AC conversion unit can be calculated using the grid voltage, the output current of the power optimization unit, the output current of the AC conversion unit, the voltage of the coupling unit, the voltage at both ends of the heating body, the current flowing through the heating body, the temperature of the heating body, the water temperature, the water volume and other data, and the current of the first electric energy output by the AC conversion unit can be adjusted according to the theoretical voltage value.

[0130] In this embodiment, the active heating adjustment unit can realize the intelligence of the heating process and achieve stepless adjustment of the heating through built-in logic and algorithms.

[0131] In another implementation of the present application, when the current parameter of the electric device reaches a second parameter threshold, the AC conversion unit and the power optimization unit are controlled to stop running.

[0132] Taking the water heater as an example, the current parameter is the current water temperature, and the second parameter threshold is the second temperature threshold. As the heating body continues to heat, the temperature of the water in the water heater reaches the second water temperature threshold set by the user. At this time, the AC conversion unit and the power optimization unit can be controlled to stop running and enter a standby state to save resources.

[0133] Specifically, when the water temperature reaches the second water temperature threshold value updated in real time, HEMS turns off the AC conversion unit and the power optimization unit, and the water temperature begins to drop slowly in the heat preservation cavity. When the water temperature drops to the set first water temperature threshold value that needs to be heated, HEMS adjusts the AC conversion unit and the power optimization unit to restart heating according to the above process. The specific implementation is referenced to Fig. 9 shown.

[0134] In summary, the embodiment of the present application introduces a thermal energy management system (HEMS), establishes a power conversion unit with complete isolation between the DC side and the AC side and flexible AC-DC coupling, actively optimizes the output power of the photovoltaic module, realizes the maximum power tracking of the photovoltaic panel power generation, ensures that the photovoltaic module works at the maximum power point, and greatly improves the utilization rate of the photovoltaic module. At the same time, the optimal power output is intelligently judged through data such as water temperature, heating body voltage and current, thereby achieving better economic benefits.

[0135] On the basis of the above-mentioned embodiment, another embodiment of the present application provides an energy conversion device, such as the above-mentioned controller, which is used to execute the above-mentioned energy control method.

[0136] Also provided in an embodiment of the present application is a computer program product, including computer-readable instructions. When the computer-readable instructions are executed on an energy conversion device, the energy conversion device implements any one of the energy control methods provided in the embodiments of the present application.

[0137] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an energy conversion device, the energy conversion device can implement any energy control method provided in the embodiment of the present application.

[0138] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. 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 application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy control system, characterized in that: include: An AC conversion unit, a power optimization unit, a coupling unit and a controller; the AC conversion unit and the power optimization unit are respectively connected to the coupling unit, and the controller is respectively connected to the AC conversion unit, the power optimization unit and the coupling unit for communication; The AC conversion unit is used to convert the AC power output by the power grid into the first electric energy based on the control of the controller; The power optimization unit is used to convert the electric energy output by the photovoltaic assembly into the second electric energy based on the control of the controller; The coupling unit is used to couple the first electric energy and the second electric energy to obtain total electric energy, and output the total electric energy to an electric device.

2. The energy control system according to claim 1, characterized in that: The energy control system further comprises: An active heating regulating unit located between the coupling unit and the electrical device; The active heating regulation unit is used to regulate the voltage value outputted from the coupling unit to the electrical device, so as to achieve stepless heating regulation of the electrical device.

3. The energy control system according to claim 1, characterized in that: The AC conversion unit includes: a controllable conversion unit or a non-controllable conversion unit; The controllable conversion unit includes an industrial frequency rectification conversion circuit or a high-frequency chopping conversion circuit constructed by active switching devices; The non-controllable conversion unit includes a rectifier or a rectifier circuit constructed by discrete devices.

4. The energy control system according to claim 1, characterized in that: The power electronic converter in the power optimization unit adopts an isolated topology structure or a non-isolated topology structure.

5. The energy control system according to claim 1, characterized in that: The coupling unit includes a capacitor.

6. The energy control system according to claim 1, characterized in that: The photovoltaic modules are connected in parallel to the power optimization unit.

7. An energy system, characterized in that: It comprises an energy control system and electrical equipment as described in any one of claims 1 to 6.

8. An energy control method, characterized in that: A controller applied to an energy control system according to any one of claims 1 to 6, wherein the energy control method comprises: The AC conversion unit is controlled to convert the AC power output by the power grid into the first electric energy, and the power optimization unit is controlled to convert the electric energy output by the photovoltaic module into the second electric energy; the first electric energy and the second electric energy are respectively output to the coupling unit, and the coupling unit couples the first electric energy and the second electric energy to obtain the total electric energy, and outputs the total electric energy to the power-consuming equipment.

9. The energy control method according to claim 8, characterized in that: Controlling the AC conversion unit to convert the AC power outputted by the power grid into the first electric energy, and controlling the power optimization unit to convert the electric energy outputted by the photovoltaic module into the second electric energy, including: Get the current parameters of the electrical equipment; Controlling the AC conversion unit to operate so that the AC conversion unit converts the AC power output by the power grid into the first electric energy; After the voltage of the coupling unit is stabilized, controlling the power optimization unit to operate so that the power optimization unit converts the electric energy output by the photovoltaic assembly into the second electric energy; The operating state of at least one of the AC conversion unit and the power optimization unit is adjusted to adjust the magnitudes of the first electric energy and the second electric energy.

10. The energy control method according to claim 9, characterized in that: Get the current parameters of the power-consuming device, including: When the current parameter is less than the first parameter threshold or an operation instruction is received, the current parameter of the electric device is obtained.

11. The energy control method according to claim 9, characterized in that: Adjusting the operating state of at least one of the AC conversion unit and the power optimization unit includes: Obtaining operating parameters of electrical equipment during operation; According to the operating parameters, the operating power of the power optimization unit is adjusted until the power of the photovoltaic module reaches a maximum power point.

12. The energy control method according to claim 11, characterized in that: After adjusting the operating power of the power optimization unit according to the operating parameters, the method further includes: According to the voltage value of the second electric energy output by the power optimization unit, the current value of the first electric energy output by the AC conversion unit is adjusted so that the voltage of the coupling unit is a fixed value.

13. The energy control method according to claim 8, characterized in that: After controlling the AC conversion unit to convert the AC power outputted by the power grid into the first electric energy, and controlling the power optimization unit to convert the electric energy outputted by the photovoltaic module into the second electric energy, the method further includes: When the current parameter of the electric device reaches the second parameter threshold, the AC conversion unit and the power optimization unit are controlled to stop running.

14. The energy control method according to claim 8, characterized in that: After controlling the AC conversion unit to convert the AC power outputted by the power grid into the first electric energy, and controlling the power optimization unit to convert the electric energy outputted by the photovoltaic module into the second electric energy, the method further includes: The active heating regulation unit is controlled to regulate the voltage value outputted from the coupling unit to the electrical device, so as to realize stepless heating regulation of the electrical device.

15. An energy conversion device, characterized in that: Used to execute the energy control method as claimed in any one of claims 8 to 14.

Images