Intelligent energy supply control system and method based on light storage and waste heat and residual pressure power generation

Abstract

The invention discloses an intelligent energy supply control system and method based on light storage and waste heat and waste pressure power generation, the system comprises a light storage module, a light storage module control mechanism, a dual-pressure waste heat power generation module and an automatic control module, the light storage module comprises a light storage group string and a light storage array, the light storage group string comprises a photovoltaic battery pack and an energy storage battery pack, the photovoltaic battery pack is connected with the energy storage battery pack, and the photovoltaic battery pack and the energy storage battery pack are group strings composed of photovoltaic batteries and energy storage batteries respectively; the optical storage module control mechanism is used for controlling the optical storage module to charge and discharge; the dual-pressure waste heat power generation module is used for collecting and heating waste heat steam to generate superheated steam for power generation; the automatic control module is used for controlling the dual-pressure waste heat power generation module to generate power; the light storage module is further used for storing the extra electric energy emitted by the dual-pressure waste heat power generation module and releasing the stored electric energy when the electric energy is needed.

Description

Technical Field

[0001] The present invention relates to the technical field of energy conservation and environmental protection, and particularly to an intelligent energy supply control system and method based on photovoltaics and energy storage, and waste heat and pressure power generation. Background Art

[0002] In the process of production, the important equipment for waste heat power generation is the waste heat boiler, which uses the heat or combustible matter in working media such as waste gas and waste liquid as the heat source to produce steam for power generation. A cement clinker production line with a daily output of 5,000 tons can generate 210,000 - 240,000 kWh of electricity by using waste heat every day, which can solve about 60% of the self - electricity consumption in clinker production, the comprehensive energy consumption of the product can be reduced by about 18%, about 25,000 tons of standard coal can be saved annually, and about 60,000 tons of carbon dioxide can be reduced.

[0003] In the prior art, automatic control of waste heat and pressure power generation can be achieved, and the input control can be automatically adjusted according to the power grid and the situation of waste heat and pressure power generation, and the control systems such as grid connection, grid access and off - grid can be realized; moreover, the pressure power generation system and the photovoltaic power generation system can charge the energy storage battery in the intelligent energy supply device, so that the energy storage system plays a role in supporting the micro - grid during off - grid operation.

[0004] However, due to the unstable heat source of the waste heat power generation system, which changes at any time, the system control complexity in the prior art is relatively high, and the photovoltaic utilization rate is relatively low, resulting in poor system stability and low power generation efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide an intelligent energy supply control system and method based on photovoltaics and energy storage, and waste heat and pressure power generation, which reduces the complexity of system control, improves the photovoltaic utilization rate, and at the same time reduces the potential safety hazards of the battery, achieving the effects of energy conservation, emission reduction, consumption reduction and efficiency improvement.

[0006] To achieve the above - mentioned purpose, the present invention provides an intelligent energy supply control system based on photovoltaics and energy storage, and waste heat and pressure power generation, including: a photovoltaics and energy storage module, a photovoltaics and energy storage module control mechanism, a dual - pressure waste heat power generation module, and an automatic control module.

[0007] The photovoltaics and energy storage module includes a photovoltaics and energy storage string and a photovoltaics and energy storage array. The photovoltaics and energy storage string includes a photovoltaic battery group and an energy storage battery group. The photovoltaic battery group is connected to the energy storage battery group, and the photovoltaic battery group and the energy storage battery group are respectively groups of strings composed of photovoltaic batteries and energy storage batteries.

[0008] The photovoltaics and energy storage module control mechanism is used to control the charging and discharging of the photovoltaics and energy storage module.

[0009] The dual - pressure waste heat power generation module is used to collect waste heat steam and heat it to generate superheated steam for power generation.

[0010] The automatic control module is used to control the power generation of the dual - pressure waste heat power generation module.

[0011] Wherein, the photovoltaic and energy storage module is also used for storing the extra electric energy generated by the dual-pressure waste heat power generation module, and releasing the stored electric energy when electric energy is needed.

[0012] Furthermore, the control mechanism of the photovoltaic and energy storage module further includes a control circuit, an input circuit and an output circuit. The input circuit includes a first DC / DC boost circuit; the input circuit is used for adjusting the voltage and current between the photovoltaic battery pack and the energy storage battery pack according to the instruction received from the control circuit.

[0013] The photovoltaic battery pack is connected to the energy storage battery pack through the first DC / DC boost circuit and the DC bus in sequence. The control circuit is connected to the first DC / DC boost circuit. The control circuit is used for controlling the first DC / DC boost circuit to boost the DC electric energy generated by the photovoltaic battery pack, so that the boosted DC electric energy is stored in the energy storage battery pack.

[0014] The energy storage battery pack is connected to the output circuit to output the required power to the load.

[0015] Wherein, the output ports of the photovoltaic battery pack, the energy storage battery pack, the output port of the control circuit and the output port of the output circuit in the photovoltaic and energy storage module are connected in series and parallel with the DC bus to form a photovoltaic power generation system.

[0016] Furthermore, the output circuit includes a second DC / DC boost circuit, a DC / DC buck circuit and a DC / AC inverter circuit.

[0017] The energy storage battery pack is connected to the high-voltage DC load through the DC bus and the second DC / DC boost circuit in sequence. The second DC / DC boost circuit is used for boosting and outputting the DC electric energy stored in the energy storage battery pack; and / or,

[0018] The energy storage battery pack is connected to the low-voltage DC load through the DC bus and the DC / DC buck circuit in sequence. The DC / DC buck circuit is used for bucking and outputting the DC electric energy stored in the energy storage battery pack; and / or,

[0019] The energy storage battery pack is connected to the AC load through the DC bus and the DC / AC inverter circuit in sequence. The DC / AC inverter circuit is used for converting the DC electric energy stored in the energy storage battery pack into AC voltage and AC electric energy and then outputting.

[0020] Among them, the output circuit is used to achieve stepless regulation of the terminal voltage of the photovoltaic energy storage module, receive the electric energy of the energy storage battery pack and supply it to the photovoltaic battery pack, the control circuit and the output circuit, and also receive the electric energy of the photovoltaic battery pack, the control circuit and the output circuit and store it in the energy storage battery pack.

[0021] Furthermore, the input circuit is used to achieve maximum power point tracking of the photovoltaic battery pack and control of the given power;

[0022] The control circuit is used to detect the voltage of the photovoltaic battery pack and the DC bus voltage through the input circuit, control the photovoltaic battery pack to output the maximum current power under illumination, and store the DC electric energy generated by the photovoltaic battery pack in the energy storage battery pack;

[0023] The control circuit is also used to detect the voltage of the photovoltaic battery pack and the DC bus voltage through the input circuit, judge the actual power situation output by the photovoltaic battery pack, when the DC electric energy output by the photovoltaic battery pack is insufficient, control the dual-pressure waste heat power generation module to generate electricity to supplement the electric energy of the system, and convert the AC electric energy generated by the dual-pressure waste heat power generation module into DC electric energy through the input circuit and store it in the energy storage battery pack.

[0024] Furthermore, the photovoltaic energy storage module includes multiple working modes:

[0025] When the maximum power of the photovoltaic battery pack can be absorbed by the energy storage battery pack and the load, the photovoltaic battery pack operates at the maximum power;

[0026] If the maximum power generation of the photovoltaic battery pack is greater than the load demand, the energy storage battery pack is in the charging state, otherwise it is in the discharging state;

[0027] If the maximum power of the photovoltaic battery pack is greater than the load demand and the energy storage battery pack is already full, the photovoltaic battery pack operates at the load power.

[0028] Furthermore, the dual-pressure waste heat power generation module includes a residual pressure AC power generation unit and a waste heat AC power generation unit, and the input circuit also includes a first AC / DC rectifier circuit and a second AC / DC rectifier circuit;

[0029] The residual pressure AC power generation unit is sequentially connected to the energy storage battery pack through the first AD / DC rectifier circuit and the DC bus; the waste heat AC power generation unit is sequentially connected to the energy storage battery pack through the second AD / DC rectifier circuit and the DC bus; the control circuit is respectively connected to the first AD / DC rectifier circuit and the second AD / DC rectifier circuit;

[0030] The control circuit is respectively used to control the first AD / DC rectifier circuit and the second AD / DC rectifier circuit to rectify the AC electric energy generated by the residual pressure AC power generation unit and the waste heat AC power generation unit into DC electric energy;

[0031] The DC bus is used to transport the rectified DC electric energy to the energy storage battery pack for storage;

[0032] Wherein, the residual pressure AC power generation unit generates AC electric energy by using pressure energy, and the waste heat AC power generation unit generates AC electric energy by using the waste heat in production.

[0033] Further, the dual-pressure waste heat power generation module includes a main plant, a sintering ring cooler waste heat boiler workshop, and a sintering belt cooler waste heat boiler workshop;

[0034] The automatic control module is used to control the dual-pressure waste heat power generation module to generate electricity through a control strategy, and the control strategy includes a feed water control strategy and an ignition and flame detection control strategy.

[0035] Further, the dual-pressure waste heat power generation module includes a steam collecting header, and a saturated steam heating boiler is provided in the sintering ring cooler waste heat boiler workshop ，

[0036] The automatic control module controls the sintering ring cooler waste heat boiler workshop and the sintering belt cooler waste heat boiler workshop to generate waste heat steam through the feed water control strategy, and collects the waste heat steam through the steam collecting header;

[0037] The automatic control module controls the dual-pressure waste heat power generation module through the ignition and flame detection control strategy, and the dual-pressure waste heat power generation module is used to heat the collected waste heat steam by using the saturated steam heating boiler to obtain superheated steam;

[0038] Wherein, the feed water control strategy includes: using the feed water of two sintering belt cooler waste heat boilers and the feed water of two sintering ring cooler waste heat boilers;

[0039] The ignition and flame detection control strategy includes: heating the collected waste heat steam by using the saturated steam heating boiler to obtain superheated steam;

[0040] Wherein, each sintering ring cooler waste heat boiler is further divided into a high-pressure and a low-pressure feed water control system;

[0041] The saturated steam heating boiler adopts four blast furnace gas burners, and a separate liquefied gas ignition pipeline is introduced into each blast furnace gas burner; and an ignition method of first igniting the liquefied gas gun by an explosion-proof high-energy igniter and then igniting the blast furnace gas by the liquefied gas gun is adopted.

[0042] Further, the automatic control module includes a management unit, a system unit, and a control unit;

[0043] The management unit is used for connecting the system server with the operator station, the engineer station, and the printer, and completing the download of upper-layer data and high-speed online data communication;

[0044] The system unit is used for connecting the system server with the field control station and the remote control station, and completing the download of data of the field control station and the remote control station and real-time data communication;

[0045] The control unit is used to realize the communication between the process I / O module and the main control unit of the field control station, and complete the transmission of real-time data.

[0046] Based on the same inventive concept, the present invention also provides an intelligent energy supply control method based on photovoltaics and waste heat and pressure power generation. The control method is applied to the aforementioned control system, and the control method includes:

[0047] Detect the voltage and current of the photovoltaic battery pack, use the voltage perturbation method to judge the optimization direction, and determine the voltage reference value of the photovoltaic battery pack, so that the output converter outputs the correct power of the photovoltaic battery pack, ensure that the photovoltaic battery pack operates in the best state, and ensure the stable supply of waste heat steam of the dual-pressure waste heat power generation module;

[0048] Integrate the waste heat steam generated by the dual-pressure waste heat power generation module according to high and low parameters, and respectively collect it into the steam collecting header; make the waste heat steam in the steam collecting header enter the steam turbine for power generation to form high-pressure steam, heat the high-pressure steam to the first predetermined temperature through a heating furnace, and use it as the main steam to enter the steam turbine to form low-pressure steam; use the heating furnace to heat the low-pressure steam to the second predetermined temperature and use it as supplementary steam to enter the steam turbine;

[0049] Wherein, the first predetermined temperature is higher than the second predetermined temperature.

[0050] Further, the output converter includes two working modes: buck and boost,

[0051] In the buck mode, the output converter receives the electric energy of the energy storage battery pack and releases it to the photovoltaic battery pack, the control circuit, and the output circuit;

[0052] In the boost mode, the output converter obtains the electric energy of the photovoltaic battery pack, the control circuit, and the output circuit and stores it in the energy storage battery pack;

[0053] Among them, the output converter is used for the regulation and control of power commands to achieve the charge and discharge balance control of the energy storage battery pack.

[0054] Technical effects and advantages of the present invention: The present invention provides a stable operating point for the power generation link of the photovoltaic battery pack through the energy storage battery pack. Even if the photovoltaic battery pack is severely mismatched, the modules will not stop working, reducing the complexity of system control and improving the photovoltaic utilization rate; through the cooperation of two unidirectional power circuits in the photovoltaic and output links, the control of photovoltaic power and the charging and discharging power of the energy storage battery is realized, improving the energy conversion efficiency while reducing costs; the energy storage batteries are grouped in small scale and connected in series and parallel through the control circuit to form a system. Therefore, the output voltage of each module is small and the output power is independently controllable, reducing the battery safety hazard and creating favorable conditions for battery equalization management; each battery module in the energy storage module has its own measurement and control function, facilitating the state monitoring of the energy storage battery monomers and the equalization control between the monomers, and at the same time improving the battery capacity utilization rate; it can not only achieve energy conservation, emission reduction, consumption reduction and efficiency increase, but also improve the self-power supply rate of the enterprise, thus achieving good economic and environmental benefits.

[0055] Other features and advantages of the present invention will be described in the following specification, and some of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0057] Figure 1 It is a schematic structural diagram of an intelligent energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to an embodiment of the present invention;

[0058] Figure 2 It is a detailed structural diagram of an intelligent energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to an embodiment of the present invention;

[0059] Figure 3 It is a flowchart of a control method for an intelligent energy supply based on photovoltaic energy storage and waste heat and pressure power generation according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0061] To solve the deficiencies of the prior art, the present invention discloses an intelligent energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation, as Figure 1 shown, including: a photovoltaic energy storage module, a photovoltaic energy storage module control mechanism, a dual-pressure waste heat power generation module, and an automatic control module.

[0062] The photovoltaic energy storage module includes a photovoltaic energy storage string and a photovoltaic energy storage array. The photovoltaic energy storage string includes a photovoltaic battery pack and an energy storage battery pack. The photovoltaic battery pack is connected to the energy storage battery pack, and the photovoltaic battery pack and the energy storage battery pack are respectively groups of strings composed of photovoltaic batteries and energy storage batteries.

[0063] The photovoltaic energy storage module control mechanism is used to control the charging and discharging of the photovoltaic energy storage module.

[0064] The dual-pressure waste heat power generation module is used to collect waste heat steam and heat it through a dedicated steam heating furnace to generate superheated steam to improve the work capacity of the steam and generate electricity efficiently.

[0065] The automatic control module adopts a highly reliable dual-Ethernet redundant structure and is used to control the power generation of the dual-pressure waste heat power generation module.

[0066] Among them, the photovoltaic energy storage module is also used to store the extra electric energy generated by the dual-pressure waste heat power generation module and release the stored electric energy when electric energy is needed.

[0067] In some specific embodiments, as Figure 2 shown, the photovoltaic energy storage module control mechanism further includes a control circuit, an input circuit, and an output circuit. The input circuit includes a first DC / DC boost circuit; the input circuit is used to adjust the voltage and current between the photovoltaic battery pack and the energy storage battery pack according to the instructions received from the control circuit.

[0068] The photovoltaic battery pack is sequentially connected to the energy storage battery pack through a first DC / DC boost circuit and a DC bus. The control circuit is connected to the first DC / DC boost circuit. The control circuit is used to control the first DC / DC boost circuit to boost the DC electric energy generated by the photovoltaic battery pack so that the boosted DC electric energy is stored in the energy storage battery pack.

[0069] The energy storage battery pack is connected to the output circuit to output the required power to the load.

[0070] Among them, the output ports of the photovoltaic battery pack, the output ports of the energy storage battery pack, the output ports of the control circuit, and the output ports of the output circuit in the photovoltaic energy storage module are connected in series and parallel to the DC bus to form a photovoltaic power generation system.

[0071] In some specific embodiments, the output circuit includes a second DC / DC boost circuit, a DC / DC buck circuit, and a DC / AC inverter circuit.

[0072] The energy storage battery pack is connected to a high-voltage DC load through a DC bus and the second DC / DC boost circuit in sequence, and the second DC / DC boost circuit is used to boost and output the DC electric energy stored in the energy storage battery pack; and / or,

[0073] The energy storage battery pack is connected to a low-voltage DC load through a DC bus and the DC / DC buck circuit in sequence, and the DC / DC buck circuit is used to step down and output the DC electric energy stored in the energy storage battery pack; and / or,

[0074] The energy storage battery pack is connected to an AC load through a DC bus and the DC / AC inverter circuit in sequence, and the DC / AC inverter circuit is used to convert the DC electric energy stored in the energy storage battery pack into an AC voltage and AC electric energy and then output;

[0075] Among them, the output circuit is used to achieve stepless adjustment of the voltage at the optical storage module end. The output circuit is used to receive the electric energy of the energy storage battery pack in the buck mode and supply it to the photovoltaic battery pack, the control circuit, and the output circuit. The output circuit is also used to receive the electric energy of the photovoltaic battery pack, the control circuit, and the output circuit in the boost mode and store it in the energy storage battery pack.

[0076] At the module level of the optical storage module, the photovoltaic battery pack, the input circuit, the energy storage battery pack, and the output circuit work together to achieve charge and discharge control of the optical storage module.

[0077] At the string level of the optical storage module, several optical storage modules are connected in series through a half-bridge of the output circuit to form an optical storage module string; multiple said optical storage module strings are connected in parallel with a buffer inductor and then supply power to a DC load through a DC bus, or, multiple said optical storage module strings supply power to an AC load through a DC / AC circuit;

[0078] Among them, each optical storage module string is equivalent to a controlled current source after passing through a buffer inductor. The controlled current source is used to release energy and obtain DC bus energy; all optical storage module strings share the load power together, and the power quota is determined by the detected DC bus voltage and the scheduling instruction.

[0079] In some specific embodiments, the input circuit is used to achieve maximum power point tracking and given power control of the photovoltaic battery pack;

[0080] The control circuit is used to detect the voltage of the photovoltaic battery pack and the DC bus voltage through the input circuit, control the photovoltaic battery pack to output the maximum current power under illumination, and store the DC electric energy generated by the photovoltaic battery pack in the energy storage battery pack.

[0081] The control circuit is also used to detect the voltage of the photovoltaic battery pack and the DC bus voltage through the input circuit, judge the actual power condition of the output of the photovoltaic battery pack, and when the DC electric energy output by the photovoltaic battery pack is insufficient, control the dual-pressure waste heat power generation module to generate electricity to supplement the electric energy of the control system, and convert the AC electric energy generated by the dual-pressure waste heat power generation module into DC electric energy through the input circuit and store it in the energy storage battery pack.

[0082] In some specific embodiments, the photovoltaic energy storage module includes three working modules:

[0083] When the maximum power of the photovoltaic battery pack can be consumed by the energy storage battery pack and the load, the photovoltaic operates at the maximum power;

[0084] If the maximum power generation of the photovoltaic battery pack is greater than the load demand, the energy storage battery pack is in the charging state, otherwise it is in the discharging state (i.e., providing power for the load);

[0085] If the maximum power of the photovoltaic battery pack is greater than the load demand and the energy storage battery pack is already full, the photovoltaic battery pack operates at the load power.

[0086] Among them, the maximum power refers to the maximum output power of the photovoltaic battery pack under specific conditions, and the maximum power generation refers to the maximum amount of electricity that the photovoltaic battery pack can generate within a specific time period.

[0087] In some specific embodiments, the dual-pressure waste heat power generation module includes a surplus pressure AC power generation unit and a waste heat AC power generation unit, and the input circuit further includes a first AC / DC rectifier circuit and a second AC / DC rectifier circuit;

[0088] The surplus pressure AC power generation unit is connected to the energy storage battery pack through the first AD / DC rectifier circuit and the DC bus in sequence; the waste heat AC power generation unit is connected to the energy storage battery pack through the second AD / DC rectifier circuit and the DC bus in sequence; the control circuit is respectively connected to the first AD / DC rectifier circuit and the second AD / DC rectifier circuit;

[0089] The control circuit is respectively used to control the first AD / DC rectifier circuit and the second AD / DC rectifier circuit to rectify the AC electric energy generated by the surplus pressure AC power generation unit and the waste heat AC power generation unit into DC electric energy;

[0090] The DC bus is used to transport the rectified DC electric energy to the energy storage battery pack for storage;

[0091] Among them, the surplus pressure AC power generation unit generates AC electric energy by using pressure energy, and the waste heat AC power generation unit generates AC electric energy by using the waste heat in production.

[0092] In some specific embodiments, the dual-pressure waste heat power generation module is divided into three workshops, including the main plant building, the waste heat boiler workshop of the sintering circular cooler, and the waste heat boiler workshop of the sintering belt cooler. The dual-pressure waste heat power generation module further includes a steam collecting header, and a saturated steam heating boiler is provided in the waste heat boiler workshop of the sintering circular cooler.

[0093] The automatic control module is used to control the dual-pressure waste heat power generation module to generate electricity through a control strategy, and the control strategy includes a feed water control strategy and an ignition and flame detection control strategy.

[0094] Specifically, the automatic control module controls the waste heat boiler workshop of the sintering circular cooler and the waste heat boiler workshop of the sintering belt cooler to generate waste heat steam through the feed water control strategy, and collects the waste heat steam through the steam collecting header;

[0095] Among them, the feed water control strategy includes: using the feed water of two waste heat boilers of the sintering belt cooler and the feed water of two waste heat boilers of the sintering circular cooler; each waste heat boiler of the sintering circular cooler is further divided into high- and low-pressure two sets of feed water control systems.

[0096] The automatic control module controls the dual-pressure waste heat power generation module through the ignition and flame detection control strategy. The dual-pressure waste heat power generation module is used to heat the collected waste heat steam by using a saturated steam heating boiler to obtain superheated steam;

[0097] Among them, the ignition and flame detection control strategy includes: heating the collected waste heat steam by using a saturated steam heating boiler to obtain superheated steam;

[0098] The saturated steam heating boiler adopts four blast furnace gas burners, and a separate liquefied gas ignition pipeline is introduced into each blast furnace gas burner; and an ignition method of first igniting the liquefied gas gun by an explosion-proof high-energy igniter and then igniting the blast furnace gas by the liquefied gas gun is adopted.

[0099] The present invention can improve the use effect of the feed water system by setting the feed water control strategy of the feed water system, thereby improving the use effect of the automatic control module.

[0100] In some specific embodiments, the automatic control module includes a management unit, a system unit, and a control unit;

[0101] The management unit is composed of a 100M high-speed redundant Ethernet and is used for the connection between the system server and the operator station, the engineer station, and the printer to complete the download of upper-layer data and high-speed online data communication;

[0102] The system unit is composed of a 100M high-speed redundant Ethernet, which is used for the connection between the system server and the on-site control station and the remote control station, and completes the data download and real-time data communication of the on-site control station and the remote control station.

[0103] The control unit is composed of a PROFIBUS-DP bus, which is used to realize the communication between the process I / O module and the main control unit of the on-site control station, and complete the transmission of real-time data.

[0104] Based on the same inventive concept, an embodiment of the present invention further provides an intelligent energy supply control method based on photovoltaic energy storage and waste heat and pressure power generation, which is applied to the aforementioned control system. The control method includes:

[0105] Detect the voltage and current of the photovoltaic battery pack, use the voltage perturbation method to judge the optimization direction, and determine the voltage reference value of the photovoltaic battery pack, so that the output converter outputs the correct power of the photovoltaic battery pack, ensuring that the photovoltaic battery pack can operate in the best state, thereby obtaining the maximum power output.

[0106] As Figure 3 shown, the waste heat steam generated by the sintering ring cooler waste heat boiler workshop and the sintering belt cooler waste heat boiler workshop (i.e., sintering waste heat, converter waste heat, and rolling mill waste heat boilers) is integrated according to high and low parameters, and respectively collected into the steam collecting header; the waste heat steam in the steam collecting header enters the steam turbine for power generation to form high-pressure steam, which is heated to a first predetermined temperature by a heating furnace and enters the steam turbine as main steam to form low-pressure steam; the low-pressure steam is heated to a second predetermined temperature by the heating furnace and enters the steam turbine as supplementary steam.

[0107] That is, the present invention ensures the stable supply of waste heat steam of the dual-pressure waste heat power generation module by controlling the operating state of the photovoltaic battery pack, thereby providing a reliable energy source for energy utilization.

[0108] Among them, the first predetermined temperature is higher than the second predetermined temperature. The first predetermined temperature is 400 degrees Celsius, and the second predetermined temperature is 350 degrees Celsius.

[0109] Regarding the method in the above embodiments, the specific manners in which each unit module performs operations have been described in detail in the embodiments related to the system, and will not be elaborated here.

[0110] The present invention provides a stable operating point for the power generation link of a photovoltaic battery pack through an energy storage battery pack. Even if the photovoltaic battery pack is severely mismatched, the modules will not stop working, reducing the complexity of system control and improving the photovoltaic utilization rate. Through the cooperation of two unidirectional power circuits in the photovoltaic and output links, the control of photovoltaic power and the charge and discharge power of the energy storage battery is achieved, improving the energy conversion efficiency while reducing costs. The energy storage batteries are grouped in small scale and connected in series and parallel through a control circuit to form a system. Therefore, the output voltage of each module is small and the output power is independently controllable, reducing the battery safety hazard and creating favorable conditions for battery equalization management. The battery module itself has measurement and control functions, facilitating the state monitoring of energy storage battery monomers and the equalization control between monomers, and improving the battery capacity utilization rate at the same time. It can not only achieve energy conservation, emission reduction, consumption reduction and efficiency improvement, but also improve the self-power supply rate of enterprises, thus obtaining good economic and environmental benefits.

[0111] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent substitution on some of the technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation, characterized in that, Comprising: a photovoltaic and energy storage module, a photovoltaic and energy storage module control mechanism, a dual-pressure waste heat power generation module, and an automatic control module; the photovoltaic and energy storage module includes a photovoltaic and energy storage string and a photovoltaic and energy storage array, the photovoltaic and energy storage string includes a photovoltaic battery bank and an energy storage battery bank, the photovoltaic battery bank is connected to the energy storage battery bank, and the photovoltaic battery bank and the energy storage battery bank are respectively a string composed of photovoltaic batteries and energy storage batteries; the photovoltaic and energy storage module control mechanism is used to control the charging and discharging of the photovoltaic and energy storage module; the dual-pressure waste heat power generation module is used to collect waste heat steam and heat it to generate superheated steam for power generation; the automatic control module is used to control the power generation of the dual-pressure waste heat power generation module; wherein, the photovoltaic and energy storage module is also used to store the additional electric energy generated by the dual-pressure waste heat power generation module and release the stored electric energy when electric energy is needed.

2. The intelligent energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to claim 1, characterized in that, The photovoltaic and energy storage module control mechanism further includes a control circuit, an input circuit, and an output circuit. The input circuit includes a first DC / DC boost circuit; the input circuit is used to adjust the voltage and current between the photovoltaic battery bank and the energy storage battery bank according to the instruction received from the control circuit; the photovoltaic battery bank is sequentially connected to the energy storage battery bank through a first DC / DC boost circuit and a DC bus. The control circuit is connected to the first DC / DC boost circuit. The control circuit is used to control the first DC / DC boost circuit to boost the DC electric energy generated by the photovoltaic battery bank so that the boosted DC electric energy is stored in the energy storage battery bank; the energy storage battery bank is connected to the output circuit to output the required power to a load; wherein, the output ports of the photovoltaic battery bank, the output ports of the energy storage battery bank, the output port of the control circuit, and the output port of the output circuit in the photovoltaic and energy storage module are connected in series and parallel to the DC bus to form a photovoltaic power generation system.

3. The intelligent energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to claim 2, characterized in that, The output circuit includes a second DC / DC boost circuit, a DC / DC buck circuit, and a DC / AC inverter circuit; the energy storage battery bank is sequentially connected to a high-voltage DC load through a DC bus and a second DC / DC boost circuit. The second DC / DC boost circuit is used to boost and output the DC electric energy stored in the energy storage battery bank; and / or, the energy storage battery bank is sequentially connected to a low-voltage DC load through a DC bus and a DC / DC buck circuit. The DC / DC buck circuit is used to step down and output the DC electric energy stored in the energy storage battery bank; and / or, the energy storage battery bank is sequentially connected to an AC load through a DC bus and a DC / AC inverter circuit. The DC / AC inverter circuit is used to convert the DC electric energy stored in the energy storage battery bank into an AC voltage and AC electric energy and then output; wherein, the output circuit is used to realize stepless adjustment of the terminal voltage of the photovoltaic and energy storage module, receive the electric energy of the energy storage battery bank and supply it to the photovoltaic battery bank, the control circuit, and the output circuit, and is also used to receive the electric energy of the photovoltaic battery bank, the control circuit, and the output circuit and store it in the energy storage battery bank.

4. The intelligent energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to claim 2 or 3, characterized in that, The input circuit is used to realize maximum power point tracking and given power control of the photovoltaic battery bank; The control circuit is used to detect the photovoltaic battery pack voltage and the DC bus voltage through the input circuit, control the photovoltaic battery pack to output the maximum current power under illumination, and store the DC electric energy generated by the photovoltaic battery pack into the energy storage battery pack; The control circuit is also used to detect the photovoltaic battery pack voltage and the DC bus voltage through the input circuit, judge the actual power condition of the output of the photovoltaic battery pack, and when the DC electric energy output by the photovoltaic battery pack is insufficient, control the dual-pressure waste heat power generation module to generate electricity to supplement the electric energy of the control system, and convert the AC electric energy generated by the dual-pressure waste heat power generation module into DC electric energy through the input circuit and store it into the energy storage battery pack.

5. The intelligent energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to claim 4, characterized in that, The photovoltaic and energy storage module includes multiple working modes: When the maximum power of the photovoltaic battery pack can be consumed by the energy storage battery pack and the load, the photovoltaic battery pack operates at the maximum power; If the maximum power generation of the photovoltaic battery pack is greater than the load demand, the energy storage battery pack is in the charging state, otherwise it is in the discharging state; If the maximum power of the photovoltaic battery pack is greater than the load demand and the energy storage battery pack is already full, the photovoltaic battery pack operates at the load power.

6. The intelligent energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to claim 1 or 5, characterized in that, The dual-pressure waste heat power generation module includes a surplus pressure AC power generation unit and a waste heat AC power generation unit, and the input circuit also includes a first AC / DC rectifier circuit and a second AC / DC rectifier circuit; The surplus pressure AC power generation unit is sequentially connected to the energy storage battery pack through the first AD / DC rectifier circuit and the DC bus; the waste heat AC power generation unit is sequentially connected to the energy storage battery pack through the second AD / DC rectifier circuit and the DC bus; the control circuit is respectively connected to the first AD / DC rectifier circuit and the second AD / DC rectifier circuit; The control circuit is respectively used to control the first AD / DC rectifier circuit and the second AD / DC rectifier circuit to rectify the AC electric energy generated by the surplus pressure AC power generation unit and the waste heat AC power generation unit into DC electric energy; The DC bus is used to deliver the rectified DC electric energy to the energy storage battery pack for storage; Among them, the surplus pressure AC power generation unit generates AC electric energy by using pressure energy, and the waste heat AC power generation unit generates AC electric energy by using the waste heat in production.

7. A smart energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to claim 1, characterized in that The dual-pressure waste heat power generation module includes a main plant building, a sintering ring cooler waste heat boiler workshop and a sintering strand cooler waste heat boiler workshop; The automatic control module is used to control the dual-pressure waste heat power generation module to generate electricity through a control strategy, and the control strategy includes a feed water control strategy, an ignition and flame detection control strategy.

8. A smart energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to claim 7, characterized in that The dual-pressure waste heat power generation module includes a steam collecting header, and a saturated steam heating boiler is provided in the waste heat boiler workshop of the sintering ring cooler. ， The automatic control module controls the sintering ring cooler waste heat boiler workshop and the sintering strand cooler waste heat boiler workshop to generate waste heat steam through the feed water control strategy, and collects the waste heat steam through the steam collecting header; The automatic control module controls the dual-pressure waste heat power generation module through the ignition and flame detection control strategy, and the dual-pressure waste heat power generation module is used to heat the collected waste heat steam with a saturated steam heating boiler to obtain superheated steam; Among them, the feed water control strategy includes: using the feed water of two sintering strand cooler waste heat boilers and the feed water of two sintering ring cooler waste heat boilers; The ignition and flame detection control strategy includes: heating the collected waste heat steam by a saturated steam heating boiler to obtain superheated steam; Among them, each waste heat boiler of the sintering ring cooler is divided into two sets of feed water control systems, namely high-pressure and low-pressure systems; The saturated steam heating boiler uses four blast furnace gas burners, and a separate liquefied gas ignition pipeline is introduced into each blast furnace gas burner; and an ignition method is adopted, which first ignites the liquefied gas gun through an explosion-proof high-energy igniter, and then ignites the blast furnace gas through the liquefied gas gun.

9. A smart energy supply control system based on photovoltaic energy storage and waste heat and pressure power generation according to claim 1, characterized in that The automation control module includes a management unit, a system unit and a control unit; The management unit is used for connecting the system server with the operator station, the engineer station and the printer to complete the download of upper-layer data and high-speed online data communication; The system unit is used for connecting the system server with the field control station and the remote control station to complete the download of data of the field control station and the remote control station and real-time data communication; The control unit is used for realizing the communication between the process I / O module and the main control unit of the field control station to complete the transmission of real-time data.

10. A smart energy supply control method based on photovoltaic energy storage and waste heat and pressure power generation, characterized in that The control method is applied to the control system according to any one of claims 1 to 9. The control method includes: Detecting the voltage and current of the photovoltaic battery pack, using the voltage perturbation method to judge the optimization direction, and determining the voltage reference value of the photovoltaic battery pack, so that the output converter outputs the correct power of the photovoltaic battery pack, ensuring that the photovoltaic battery pack operates in the best state and ensuring the stable supply of waste heat steam of the dual-pressure waste heat power generation module; Integrating the waste heat steam generated by the dual-pressure waste heat power generation module according to high and low parameters and respectively collecting it into the steam collecting header; enabling the waste heat steam in the steam collecting header to enter the steam turbine for power generation to form high-pressure steam, heating the high-pressure steam to a first predetermined temperature by a heating furnace, and using it as the main steam to enter the steam turbine to form low-pressure steam; using the heating furnace to heat the low-pressure steam to a second predetermined temperature and using it as supplementary steam to enter the steam turbine; Among them, the first predetermined temperature is higher than the second predetermined temperature.

Images