Energy-saving and frequency-modulating device for industrial power supply

Abstract

The invention is suitable for the technical field of industrial power supply, and provides an energy saving and frequency modulation device for industrial power supply, which comprises an energy storage bidirectional converter P1, an energy storage inverter P4, a lithium iron phosphate battery module B1, a DCDC power supply P2, an energy type super capacitor C1 and a master control energy management system U1, one end of the energy storage bidirectional converter P1 and one end of the energy storage inverter P4 are connected to the output end of an external transformer in parallel, the other end of the energy storage inverter P4 is connected with one end of the energy type super capacitor C1, the other end of the energy type super capacitor C1 is connected with one end of the DCDC power supply P2, the other end of the DCDC power supply P2 is connected with a bidirectional current interface of the lithium iron phosphate battery module B1, and the other end of the lithium iron phosphate battery module B1 is connected with the bidirectional current interface of the lithium iron phosphate battery module B1. A one-way current interface of the lithium iron phosphate battery module B1 is connected with the other end of the energy storage bidirectional converter P1, and the master control energy management system U1 is in data connection with the energy storage bidirectional converter P1, the energy storage inverter P4, the lithium iron phosphate battery module B1, the DCDC power supply P2 and the energy type super capacitor C1.

Description

Technical Field

[0001] The present application belongs to the field of industrial power supply technology, and in particular relates to an energy-saving and frequency-modulating device for industrial power supply. Background Art

[0002] Industrial power supply for steel mills, chemical plants, semiconductor factories, and large amusement parks typically flows from the grid through high-voltage transformers. This power is often affected by the transformer's power output. These plants' daily average power output is low, but their instantaneous power output is high and random. Excessive loads often lead to power outages or transformer damage. To meet these load demands, transformers are often oversized, resulting in increased base electricity costs and wasteful transformer expansion. Transformers are limited in power output due to cost and infrastructure factors, but the power output of factory power supply equipment often exceeds the transformer's capacity, causing grid voltage to drop. Many factories have a high concentration of inductive loads, resulting in high reactive power and low transformer utilization, further lowering the grid voltage when power supply equipment is operating. Peak loads in large factories are random and occur at irregular times throughout the day, making traditional battery energy storage incapable of meeting these high load demands. Large factories consume enormous amounts of electricity, and designing oversized main transformers is difficult and expensive, leading to high operating costs. This indicates that the process of industrial power supply is irrational. Summary of the Invention

[0003] The embodiments of the present application provide an energy-saving and frequency-modulating device for industrial power supply, which addresses the problem of irrationality in the existing industrial power supply process.

[0004] The embodiment of the present application provides an energy-saving and frequency-modulating device for industrial power supply, the device comprising: an energy storage bidirectional converter P1, an energy storage inverter P4, a lithium iron phosphate battery module B1, a DC / DC power supply P2, an energy-type supercapacitor C1, and a master energy management system U1;

[0005] Among them, one end of the energy storage bidirectional converter P1 and one end of the energy storage inverter P4 are connected in parallel to the output end of the external transformer, the other end of the energy storage inverter P4 is connected to one end of the energy-type supercapacitor C1, the other end of the energy-type supercapacitor C1 is connected to one end of the DCDC power supply P2, the other end of the DCDC power supply P2 is connected to the bidirectional current interface of the lithium iron phosphate battery module B1, the unidirectional current interface of the lithium iron phosphate battery module B1 is connected to the other end of the energy storage bidirectional converter P1, and the main control energy management system U1 is respectively connected to the energy storage bidirectional converter P1, the energy storage inverter P4, the lithium iron phosphate battery module B1, the DCDC power supply P2 and the energy-type supercapacitor C1.

[0006] Optionally, a photovoltaic DCDC module P3 is further included, and the output end of the photovoltaic DCDC module P3 is connected to the unidirectional current interface of the lithium iron phosphate battery module B1.

[0007] Optionally, the photovoltaic DCDC module P3 is data-connected to the master energy management system U1.

[0008] Optionally, the capacity of the lithium iron phosphate battery module is at least 10 times the capacity of the energy-type supercapacitor C1.

[0009] On the other hand, the present application provides an energy-saving and frequency-modulation method for industrial power supply, comprising:

[0010] At night and / or when electricity prices are low, if the charge of the lithium iron phosphate battery module B1 is less than 90%, the main control energy management system U1 controls the energy storage bidirectional converter P1 so that the external transformer replenishes the charge of the lithium iron phosphate battery module B1 until the charge of the lithium iron phosphate battery module B1 is greater than 95%;

[0011] During the daytime and / or when the electricity price is at a peak and / or the grid load power is large, if the charge of the energy-type supercapacitor C1 is in the range of 5-100%, the energy-type supercapacitor C1 is controlled by the master energy management system U1 so that the energy-type supercapacitor C1 discharges to the external transformer through the DCDC power supply P2;

[0012] When the power level of the energy-type supercapacitor C1 is less than 50%, and / or the power level of the lithium iron phosphate battery module B1 is 20%-100%, the main control energy management system U1 controls the lithium iron phosphate battery module B1 to supplement the power of the energy-type supercapacitor C1 through the DCDC power supply P2;

[0013] When the power level of the lithium iron phosphate battery module B1 is less than 15%, the main control energy management system U1 controls the energy storage bidirectional converter P1 to maintain a charging state.

[0014] Optionally, the method further includes:

[0015] Obtain the grid power and the photovoltaic power of the photovoltaic DCDC module P3;

[0016] When the grid power is greater than the photovoltaic power, the main control energy management system U1 controls the photovoltaic DCDC module P3 and the lithium iron phosphate battery module B1 to supply power to the grid at the same time;

[0017] When the grid power is less than the photovoltaic power, the main control energy management system U1 controls the photovoltaic DCDC module P3 to simultaneously supply power to the grid and the lithium iron phosphate battery module B1.

[0018] Optionally, the method further includes:

[0019] When the power level of the energy-type supercapacitor C1 is less than 50%, obtaining the charge and discharge status of the energy-type supercapacitor C1;

[0020] The power grid power fluctuation data is determined based on the charging and discharging status, and based on the power grid power fluctuation data, the energy-type supercapacitor C1 and the energy storage inverter P4 are controlled by the main control energy management system U1, so that the energy-type supercapacitor C1 supplements the load corresponding to the power grid power fluctuation data through the energy storage inverter P4.

[0021] Compared with the prior art, the embodiments of the present application have the following beneficial effects: through the energy storage bidirectional converter P1, the energy storage inverter P4, the lithium iron phosphate battery module B1, the DCDC power supply P2, the energy-type supercapacitor C1 and the main control energy management system U1; wherein, one end of the energy storage bidirectional converter P1 and one end of the energy storage inverter P4 are connected in parallel to the output end of the external transformer, the other end of the energy storage inverter P4 is connected to one end of the energy-type supercapacitor C1, the other end of the energy-type supercapacitor C1 is connected to one end of the DCDC power supply P2, the other end of the DCDC power supply P2 is connected to the bidirectional current interface of the lithium iron phosphate battery module B1, the unidirectional current interface of the lithium iron phosphate battery module B1 is connected to the other end of the energy storage bidirectional converter P1, and the main control energy management system U1 is respectively connected to the energy storage bidirectional converter P1, the energy storage inverter P4, the lithium iron phosphate battery module B1, the DCDC power supply P2 and the energy-type supercapacitor C1. It reduces the burden on power transformers and can maintain the load of the entire factory at a lower level; it can compensate power to the grid at any time according to the load conditions, thereby improving the stability of the grid; lithium batteries are used to shave peaks and fill valleys, and the excess energy of lithium batteries is used to replenish the supercapacitor, allowing the supercapacitor to play the characteristics of dynamic power compensation; the excess energy in the system is recovered, the quality of the grid is optimized, and the power factor can be increased to above 0.98, which improves the quality of the grid and the utilization rate of the transformer; after the excess energy is recovered and released, photovoltaic power generation is used to modulate the frequency of the energy-type supercapacitor, which can further save energy and provide grid frequency modulation to keep the grid stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 This is a structural diagram of an energy-saving and frequency-modulating device for industrial power supply provided in one embodiment of the present application. DETAILED DESCRIPTION

[0024] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0025] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0026] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0027] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0028] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0029] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0030] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0031] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0032] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0033] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0034] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0035] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0036] like Figure 1 As shown, the embodiment of the present application provides an energy-saving and frequency-modulating device for industrial power supply, the device comprising: an energy storage bidirectional converter P1, an energy storage inverter P4, a lithium iron phosphate battery module B1, a DCDC power supply P2, an energy-type supercapacitor C1, and a master energy management system U1;

[0037] Among them, one end of the energy storage bidirectional converter P1 and one end of the energy storage inverter P4 are connected in parallel to the output end of the external transformer, the other end of the energy storage inverter P4 is connected to one end of the energy-type supercapacitor C1, the other end of the energy-type supercapacitor C1 is connected to one end of the DCDC power supply P2, the other end of the DCDC power supply P2 is connected to the bidirectional current interface of the lithium iron phosphate battery module B1, the unidirectional current interface of the lithium iron phosphate battery module B1 is connected to the other end of the energy storage bidirectional converter P1, and the main control energy management system U1 is respectively connected to the energy storage bidirectional converter P1, the energy storage inverter P4, the lithium iron phosphate battery module B1, the DCDC power supply P2 and the energy-type supercapacitor C1.

[0038] Exemplarily, the energy storage bidirectional converter P1, the energy storage inverter P4, the lithium iron phosphate battery module B1, the DCDC power supply P2, the energy-type supercapacitor C1 and the photovoltaic DCDC module P3 constitute a power compensation and frequency modulation system, and the bus voltage of the energy storage bidirectional converter P1 is 1000-1500VDC.

[0039] In a possible implementation, an energy-saving and frequency-modulating device for industrial power supply further includes a photovoltaic DCDC module P3 , wherein an output end of the photovoltaic DCDC module P3 is connected to a unidirectional current interface of the lithium iron phosphate battery module B1 .

[0040] In a possible implementation, the photovoltaic DCDC module P3 is data-connected to the master energy management system U1.

[0041] In one possible embodiment, the capacity of the lithium iron phosphate battery module is at least 10 times the capacity of the energy-type supercapacitor C1.

[0042] Exemplarily, the energy-type supercapacitor C1 can withstand a charging rate of 10 times the rate to ensure that the energy-type supercapacitor C1 can be fully charged within minutes.

[0043] In one possible implementation, the present application provides an energy-saving and frequency-modulation method for industrial power supply, including:

[0044] At night and / or when electricity prices are low, if the charge of the lithium iron phosphate battery module B1 is less than 90%, the main control energy management system U1 controls the energy storage bidirectional converter P1 so that the external transformer replenishes the charge of the lithium iron phosphate battery module B1 until the charge of the lithium iron phosphate battery module B1 is greater than 95%;

[0045] During the daytime and / or when the electricity price is at a peak and / or the grid load power is large, if the charge of the energy-type supercapacitor C1 is in the range of 5-100%, the energy-type supercapacitor C1 is controlled by the master energy management system U1 so that the energy-type supercapacitor C1 discharges to the external transformer through the DCDC power supply P2;

[0046] When the power level of the energy-type supercapacitor C1 is less than 50%, and / or the power level of the lithium iron phosphate battery module B1 is 20%-100%, the main control energy management system U1 controls the lithium iron phosphate battery module B1 to supplement the power of the energy-type supercapacitor C1 through the DCDC power supply P2;

[0047] When the power level of the lithium iron phosphate battery module B1 is less than 15%, the main control energy management system U1 controls the energy storage bidirectional converter P1 to maintain a charging state.

[0048] For example, at night and when electricity prices are low, when the charge of the lithium iron phosphate battery module B1 is less than 90%, the energy storage bidirectional converter P1 supplements the charge of the lithium iron phosphate battery module B1 through the grid until the charge of the lithium iron phosphate battery module B1 is greater than 95%; during the daytime peak electricity price or the time period when the grid load power is large, when the charge of the energy-type supercapacitor C1 is in the range of 5-100%, the energy-type supercapacitor C1 discharges to the grid through the DCDC power supply P2 to supplement the grid power; the lithium iron phosphate battery module B1 has two interfaces, interface 1 is a bidirectional interface that can both charge and discharge, and interface 2 is a unidirectional interface that can only discharge; during the daytime, the photovoltaic DCDC module P3 provides energy to the grid through the energy storage bidirectional converter P1. When the grid power is greater than the photovoltaic power, the photovoltaic and lithium iron phosphate battery modules B1 supply power to the grid at the same time. When the grid power is less than When photovoltaic power is on, photovoltaic power supplies to the grid and the excess power is charged to the lithium iron phosphate battery module B1; when the power of the energy supercapacitor C1 is less than 50%, the two interfaces of the lithium iron phosphate battery module B1 start discharging. At this time, the lithium iron phosphate battery module B1 replenishes the power of the energy supercapacitor C1 through the DCDC power supply P2. The energy supercapacitor C1 supports charging and discharging at the same time. The load changes caused by grid power fluctuations are supplemented by the energy supercapacitor C1 through the energy storage inverter P4; when the power of the lithium iron phosphate battery module B1 is 20%-100%, the two outputs of the lithium iron phosphate battery module B1 are turned on and the energy supercapacitor C1 is charged through the DCDC power supply P2; when the power of the lithium iron phosphate battery module B1 is less than 15%, the main control energy management system U1 controls the energy storage bidirectional converter P1 to the charging state, and the battery supports charging and discharging to meet the excess power.

[0049] In a possible implementation, the method further includes:

[0050] Obtain the grid power and the photovoltaic power of the photovoltaic DCDC module P3;

[0051] When the grid power is greater than the photovoltaic power, the main control energy management system U1 controls the photovoltaic DCDC module P3 and the lithium iron phosphate battery module B1 to supply power to the grid at the same time;

[0052] When the grid power is less than the photovoltaic power, the main control energy management system U1 controls the photovoltaic DCDC module P3 to simultaneously supply power to the grid and the lithium iron phosphate battery module B1.

[0053] In a possible implementation, the method further includes:

[0054] When the power level of the energy-type supercapacitor C1 is less than 50%, obtaining the charge and discharge status of the energy-type supercapacitor C1;

[0055] The power grid power fluctuation data is determined based on the charging and discharging status, and based on the power grid power fluctuation data, the energy-type supercapacitor C1 and the energy storage inverter P4 are controlled by the main control energy management system U1, so that the energy-type supercapacitor C1 supplements the load corresponding to the power grid power fluctuation data through the energy storage inverter P4.

[0056] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. An energy-saving and frequency-modulating device for industrial power supply, characterized in that: The device includes: an energy storage bidirectional converter P1, an energy storage inverter P4, a lithium iron phosphate battery module B1, a DCDC power supply P2, an energy type super capacitor C1 and a main control energy management system U1; Among them, one end of the energy storage bidirectional converter P1 and one end of the energy storage inverter P4 are connected in parallel to the output end of the external transformer, the other end of the energy storage inverter P4 is connected to one end of the energy-type supercapacitor C1, the other end of the energy-type supercapacitor C1 is connected to one end of the DCDC power supply P2, the other end of the DCDC power supply P2 is connected to the bidirectional current interface of the lithium iron phosphate battery module B1, the unidirectional current interface of the lithium iron phosphate battery module B1 is connected to the other end of the energy storage bidirectional converter P1, and the main control energy management system U1 is respectively connected to the energy storage bidirectional converter P1, the energy storage inverter P4, the lithium iron phosphate battery module B1, the DCDC power supply P2 and the energy-type supercapacitor C1.

2. The energy-saving and frequency-modulating device for industrial power supply according to claim 1, characterized in that: It also includes a photovoltaic DCDC module P3, the output end of which is connected to the unidirectional current interface of the lithium iron phosphate battery module B1.

3. The energy-saving and frequency-modulating device for industrial power supply according to claim 2, characterized in that: The photovoltaic DCDC module P3 is data-connected to the master energy management system U1.

4. The energy-saving and frequency-modulating device for industrial power supply according to claim 1, characterized in that: The capacity of the lithium iron phosphate battery module is at least 10 times the capacity of the energy-type supercapacitor C1.

5. A method for energy saving and frequency modulation for industrial power supply, characterized in that: include: At night and / or when electricity prices are low, if the power level of the lithium iron phosphate battery module B1 is less than 90%, the main control energy management system U1 controls the energy storage bidirectional converter P1 so that the external transformer supplements the power of the lithium iron phosphate battery module B1 until the power level of the lithium iron phosphate battery module B1 is greater than 95%; During the day and / or when the electricity price is at a peak and / or the grid load power is large, if the power of the energy-type supercapacitor C1 is in the range of 5-100%, the energy-type supercapacitor C1 is controlled by the main control energy management system U1 so that the energy-type supercapacitor C1 discharges to the external transformer through the DCDC power supply P2; When the power of the energy-type supercapacitor C1 is less than 50%, and / or the power of the lithium iron phosphate battery module B1 is 20%-100%, the main control energy management system U1 controls the lithium iron phosphate battery module B1 to supplement the power of the energy-type supercapacitor C1 through the DCDC power supply P2; When the power level of the lithium iron phosphate battery module B1 is less than 15%, the energy storage bidirectional converter P1 is controlled by the main control energy management system U1 to maintain the charging state.

6. The energy-saving and frequency-modulation method for industrial power supply according to claim 5, characterized in that: The method further comprises: Obtain the grid power and the photovoltaic power of the photovoltaic DCDC module P3; When the grid power is greater than the photovoltaic power, the photovoltaic DCDC module P3 and the lithium iron phosphate battery module B1 are controlled by the main control energy management system U1 to supply power to the grid at the same time; When the grid power is less than the photovoltaic power, the photovoltaic DCDC module P3 is controlled by the main control energy management system U1 to supply power to the grid and the lithium iron phosphate battery module B1 at the same time.

7. The energy-saving and frequency-modulation method for industrial power supply according to claim 5, characterized in that: The method further comprises: When the power of the energy-type supercapacitor C1 is less than 50%, obtaining the charge and discharge state of the energy-type supercapacitor C1; The power grid power fluctuation data is determined based on the charging and discharging state, and based on the power grid power fluctuation data, the energy-type supercapacitor C1 and the energy storage inverter P4 are controlled by the main control energy management system U1, so that the energy-type supercapacitor C1 supplements the load corresponding to the power grid power fluctuation data through the energy storage inverter P4.

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