Energy storage system of hydropower station

Abstract

The utility model discloses an energy storage system of a hydropower station, and relates to the technical field of power stations. The input end of the first transformer is connected with the output ends of the plurality of power generation modules; the output end of the first transformer is connected with the input end of the mutual inductor and a power grid; the plurality of energy storage modules are connected with the mutual inductor; the processing module is respectively connected with the plurality of energy storage modules; and the voltage detection module is respectively connected with the power grid and the processing module. When the hydroelectric generation voltage is too high, one part stores energy through a plurality of energy storage modules, and the other part is connected into a power grid; when the hydroelectric power generation voltage is too low, the multiple energy storage modules and the hydroelectric power station are jointly connected into the power grid. And the power grid voltage is stabilized.

Description

Technical Field

[0001] The utility model relates to the technical field of power stations, in particular to an energy storage system of a hydropower station. Background Art

[0002] At present, a large amount of hydropower is connected to the distribution network across the country. The strong seasonality of hydropower often causes a series of problems such as large voltage fluctuations in the distribution network and uncertain changes in system flow. When the hydropower voltage is too high, the output voltage is too large; when the hydropower voltage is too low, the output voltage is too small. It is impossible to provide safe and stable power supply quality to local residents, and it seriously threatens the normal operation of electrical equipment. Therefore, it is particularly important to increase the stability of hydropower generation. Utility Model Content

[0003] The utility model aims to provide an energy storage system for a hydropower station to increase the stability of hydroelectric power generation.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] One aspect of an embodiment of the utility model provides an energy storage system for a hydropower station, the energy storage system comprising: a plurality of power generation modules; a first transformer, the input end of the first transformer is connected to the output ends of the plurality of power generation modules; a mutual inductor, the output end of the first transformer is connected to the input end of the mutual inductor and a power grid; a plurality of energy storage modules, the plurality of energy storage modules are connected to the mutual inductor; a processing module, the processing modules are respectively connected to the plurality of energy storage modules; and a voltage detection module, the voltage detection module is respectively connected to the power grid and the processing module.

[0006] In some embodiments, the energy storage module includes a first step-down transformer, a rectifier and filter circuit, a battery pack, an inverter circuit and a charging control circuit, the input end of the first step-down transformer is connected to the output end of the mutual inductor, the input end of the rectifier and filter circuit is connected to the output end of the first step-down transformer, the charging control circuit is respectively connected to the output end of the rectifier and filter circuit and the positive electrode of the battery pack, the negative electrode of the battery pack is connected to a first location, the input end of the inverter circuit is respectively connected to the positive and negative electrodes of the battery pack, the output end of the inverter circuit is connected to the power grid, and the control end of the inverter circuit is connected to the processing module.

[0007] In some embodiments, the energy storage module further includes a voltage stabilizing circuit, and the voltage stabilizing circuit is respectively connected to the output end of the rectifier and filter circuit and the charging control circuit.

[0008] In some embodiments, the charging control circuit includes a first NPN transistor, a relay, a diode and a first resistor, the collector of the first NPN transistor is connected to a power supply, the base of the first NPN transistor is connected to the processing module, the emitter of the first NPN transistor is connected to one end of the coil end of the relay, the other end of the coil end of the relay is connected to a first location through a first resistor, one end of the controlled end of the relay is connected to the voltage stabilizing circuit, and the other end of the controlled end of the relay is connected to the positive electrode of the battery pack.

[0009] In some embodiments, the charging control circuit further includes a diode, wherein the anode of the diode is connected to the other end of the coil end of the relay, and the cathode of the diode is connected to one end of the coil end of the relay.

[0010] In some embodiments, the charging control circuit also includes a second resistor, a third resistor and a first capacitor, one end of the second resistor is connected to the positive electrode of the battery pack, the other end of the second resistor is connected to one end of the third resistor, one end of the first capacitor and the processing module, and the other end of the third resistor is connected to the first location.

[0011] In some embodiments, the rectification and filtering circuit includes a first rectifier bridge, a second capacitor and a third capacitor, the input end of the first rectifier bridge is connected to the output end of the mutual inductor, the positive output end of the first rectifier bridge is connected to one end of the second capacitor, one end of the third capacitor and the input end of the voltage stabilizing circuit, the negative output end of the first rectifier bridge serves as the first location, the other end of the second capacitor and the other end of the third capacitor are connected to the first location, and the capacitance of the second capacitor is greater than the capacitance of the third capacitor.

[0012] In some embodiments, the voltage detection module includes a second step-down transformer, a second rectifier bridge, a fourth capacitor, a fifth capacitor, a fourth resistor and a fifth resistor, the input end of the second step-down transformer is connected to the output end of the mutual inductor, the output end of the second step-down transformer is connected to the input end of the second rectifier bridge, the positive output end of the second rectifier bridge is connected to one end of the fourth capacitor, one end of the fifth capacitor and one end of the fourth resistor, the other end of the fourth resistor is connected to the processing module and one end of the fifth resistor, the negative output end of the second rectifier bridge serves as the second location, and the other end of the fourth capacitor, the other end of the fifth capacitor and the other end of the fifth resistor are all connected to the second location.

[0013] In some embodiments, the power generation module includes a generator set, a frequency converter and a second transformer, the frequency converter is respectively connected to the output end of the generator set and the input end of the second transformer, and the output end of the second transformer is connected to the input end of the first transformer.

[0014] According to the embodiment of the utility model, a hydropower station energy storage system has at least the following beneficial effects: when the hydropower voltage is too high, a part of it is stored through multiple energy storage modules, and the other part is connected to the power grid; when the hydropower voltage is too low, multiple energy storage modules and the hydropower station are connected to the power grid together to stabilize the power grid voltage.

[0015] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 paying any creative work.

[0017] Figure 1 is a principle block diagram of an energy storage system according to an embodiment;

[0018] Figure 2 is a circuit schematic diagram of an energy storage module according to an embodiment;

[0019] Figure 3 is a circuit schematic diagram of a voltage detection module according to an embodiment. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present disclosure will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0024] The technical solution of the embodiment of the present application is briefly described below:

[0025] According to some embodiments, Figure 1 As shown, the present application provides an energy storage system for a hydropower station, the energy storage system comprising:

[0026] Multiple power generation modules;

[0027] A first transformer 1, wherein an input end of the first transformer 1 is connected to output ends of a plurality of power generation modules;

[0028] A transformer, wherein the output end of the first transformer 1 is connected to the input end of the transformer and the power grid;

[0029] Multiple energy storage modules, multiple energy storage modules connected to mutual inductors;

[0030] A processing module, wherein the processing modules are respectively connected to a plurality of energy storage modules;

[0031] A voltage detection module is connected to the power grid and the processing module respectively.

[0032] Specifically, the above working principle is that when the hydroelectric power generation voltage is too high, the processing module detects that the voltage on the grid input side is too high through the voltage detection module, and the processing module controls multiple energy storage modules to start storing energy to reduce the voltage on the grid input side and return it to the ideal range. When the hydroelectric power generation voltage is too low, the processing module detects that the voltage on the grid input side is too low through the voltage detection module, and the processing module controls multiple energy storage modules and the hydroelectric power station to be connected to the grid together to increase the voltage on the grid input side and return it to the ideal range. The stability of the grid voltage is achieved as a whole.

[0033] The following is combined with the appendix of this manual Figures 1 to 3 , the preferred implementation modes of the present disclosure are further elaborated in detail.

[0034] According to some embodiments, Figure 2 As shown, the energy storage module includes a first step-down transformer T1, a rectifier filter circuit, a battery pack, an inverter circuit and a charging control circuit. The input end of the first step-down transformer T1 is connected to the output end of the mutual inductor, the input end of the rectifier filter circuit is connected to the output end of the first step-down transformer T1, the charging control circuit is respectively connected to the output end of the rectifier filter circuit and the positive electrode of the battery pack, the negative electrode of the battery pack is connected to the first location, the input end of the inverter circuit is respectively connected to the positive electrode and the negative electrode of the battery pack, the output end of the inverter circuit is connected to the power grid, and the control end of the inverter circuit is connected to the processing module.

[0035] Specifically, there is a step-up transformer in the inverter circuit. The above working principle is that the first step-down transformer T1 is used to step down the voltage. When the hydroelectric power voltage is too high, the rectifier and filter circuit rectifies the voltage output by the first step-down transformer T1 into DC and then filters and outputs it to the battery pack, so that the battery pack can be charged and stored. When the hydroelectric power voltage is too low, the inverter circuit inverts and boosts the voltage of the battery pack and then connects it to the power grid.

[0036] According to some embodiments, Figure 2 As shown, the energy storage module also includes a voltage stabilizing circuit, which is connected to the output end of the rectifier filter circuit and the charging control circuit respectively. The voltage stabilizing circuit makes the charging voltage of the battery pack stable.

[0037] According to some embodiments, Figure 2 As shown, the charging control circuit includes a first NPN transistor Q1, a relay K, a diode D and a first resistor R1, the collector of the first NPN transistor Q1 is connected to the power supply, the base of the first NPN transistor Q1 is connected to the processing module, the emitter of the first NPN transistor Q1 is connected to one end of the coil end of the relay K, the other end of the coil end of the relay K is connected to the first location through the first resistor R1, one end of the controlled end of the relay K is connected to the voltage stabilizing circuit, and the other end of the controlled end of the relay K is connected to the positive electrode of the battery pack.

[0038] Specifically, the above working principle is that when the hydroelectric power generation voltage is too high, the processing module controls the first NPN transistor Q1 to be turned on, the coil end of the relay K is energized, the controlled end of the relay K is attracted, and the battery pack is charged.

[0039] When the hydroelectric power generation voltage is too low, the processing module controls the first NPN transistor Q1 to be turned off, the coil end of the relay K is not energized, the controlled end of the relay K is disconnected, the battery pack is not charged, and at the same time, the processing module controls the inverter circuit to work.

[0040] According to some embodiments, Figure 2 As shown, the charging control circuit also includes a diode D, the positive electrode of the diode D is connected to the other end of the coil end of the relay K, and the negative electrode of the diode D is connected to one end of the coil end of the relay K.

[0041] When the processing module controls the first NPN transistor Q1 to be turned off, the coil end of the relay K is freewheeling through the diode D, so as to increase the service life of the relay K.

[0042] According to some embodiments, the charging control circuit also includes a second resistor R2, a third resistor R3 and a first capacitor C1, one end of the second resistor R2 is connected to the positive electrode of the battery pack, the other end of the second resistor R2 is connected to one end of the third resistor R3, one end of the first capacitor C1 and the processing module, and the other end of the third resistor R3 is connected to the first location.

[0043] The processing module detects the power of the battery pack through the second resistor R2. When the battery pack is fully charged, the processing module controls the relay K to be disconnected through the first NPN transistor Q1, and the battery pack stops charging.

[0044] According to some embodiments, Figure 2 As shown, the rectifier and filter circuit includes a first rectifier bridge DB1, a second capacitor C2 and a third capacitor C3. The input end of the first rectifier bridge DB1 is connected to the output end of the mutual inductor, the positive output end of the first rectifier bridge DB1 is connected to one end of the second capacitor C2, one end of the third capacitor C3 and the input end of the voltage stabilizing circuit, the negative output end of the first rectifier bridge DB1 serves as the first location, the other end of the second capacitor C2 and the other end of the third capacitor C3 are connected to the first location, and the capacitance of the second capacitor C2 is greater than the capacitance of the third capacitor C3.

[0045] According to some embodiments, Figure 3 As shown, the voltage detection module includes a second step-down transformer T2, a second rectifier bridge DB2, a fourth capacitor C4, a fifth capacitor C5, a fourth resistor R4 and a fifth resistor R5. The input end of the second step-down transformer T2 is connected to the output end of the mutual inductor, the output end of the second step-down transformer T2 is connected to the input end of the second rectifier bridge DB2, the positive output end of the second rectifier bridge DB2 is connected to one end of the fourth capacitor C4, one end of the fifth capacitor C5 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the processing module and one end of the fifth resistor R5, the negative output end of the second rectifier bridge DB2 serves as the second location, and the other end of the fourth capacitor C4, the other end of the fifth capacitor C5 and the other end of the fifth resistor R5 are all connected to the second location.

[0046] According to some embodiments, Figure 1As shown, the power generation module includes a generator set, a frequency converter and a second transformer 2 , the frequency converter is respectively connected to the output end of the generator set and the input end of the second transformer 2 , and the output end of the second transformer 2 is connected to the input end of the first transformer 1 .

[0047] In this application, when the hydroelectric power generation voltage is too high, a part of it is stored through multiple energy storage modules, and the other part is connected to the power grid; when the hydroelectric power generation voltage is too low, multiple energy storage modules and the hydroelectric power station are connected to the power grid together to stabilize the power grid voltage.

[0048] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0049] Although the present disclosure has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present disclosure can be implemented in a variety of forms without departing from the spirit or essence of the present application, it should be understood that the above-mentioned embodiments are not limited to any of the foregoing details, but should be widely interpreted within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. An energy storage system for a hydropower station, characterized in that: The energy storage system comprises: Multiple power generation modules; A first transformer, wherein an input end of the first transformer is connected to output ends of the plurality of power generation modules; A mutual inductor, wherein the output end of the first transformer is connected to the input end of the mutual inductor and a power grid; A plurality of energy storage modules, wherein the plurality of energy storage modules are connected to the mutual inductor; a processing module, wherein the processing modules are respectively connected to the plurality of energy storage modules; A voltage detection module is connected to the power grid and the processing module respectively.

2. The energy storage system according to claim 1, characterized in that: The energy storage module includes a first step-down transformer, a rectifier and filter circuit, a battery pack, an inverter circuit and a charging control circuit. The input end of the first step-down transformer is connected to the output end of the mutual inductor, the input end of the rectifier and filter circuit is connected to the output end of the first step-down transformer, the charging control circuit is respectively connected to the output end of the rectifier and filter circuit and the positive electrode of the battery pack, the negative electrode of the battery pack is connected to a first location, the input end of the inverter circuit is respectively connected to the positive electrode and the negative electrode of the battery pack, the output end of the inverter circuit is connected to the power grid, and the control end of the inverter circuit is connected to the processing module.

3. The energy storage system according to claim 2, characterized in that: The energy storage module also includes a voltage stabilizing circuit, which is respectively connected to the output end of the rectifier and filter circuit and the charging control circuit.

4. The energy storage system according to claim 3, characterized in that: The charging control circuit includes a first NPN transistor, a relay, a diode and a first resistor, the collector of the first NPN transistor is connected to a power supply, the base of the first NPN transistor is connected to the processing module, the emitter of the first NPN transistor is connected to one end of the coil end of the relay, the other end of the coil end of the relay is connected to a first location through a first resistor, one end of the controlled end of the relay is connected to the voltage stabilizing circuit, and the other end of the controlled end of the relay is connected to the positive electrode of the battery pack.

5. The energy storage system according to claim 4, characterized in that: The charging control circuit further includes a diode, wherein the anode of the diode is connected to the other end of the coil end of the relay, and the cathode of the diode is connected to one end of the coil end of the relay.

6. The energy storage system according to claim 4, characterized in that: The charging control circuit also includes a second resistor, a third resistor and a first capacitor, one end of the second resistor is connected to the positive electrode of the battery pack, the other end of the second resistor is connected to one end of the third resistor, one end of the first capacitor and the processing module, and the other end of the third resistor is connected to the first location.

7. The energy storage system according to claim 6, characterized in that: The rectification and filtering circuit includes a first rectifier bridge, a second capacitor and a third capacitor. The input end of the first rectifier bridge is connected to the output end of the mutual inductor, the positive output end of the first rectifier bridge is connected to one end of the second capacitor, one end of the third capacitor and the input end of the voltage stabilizing circuit, the negative output end of the first rectifier bridge serves as a first location, the other end of the second capacitor and the other end of the third capacitor are connected to the first location, and the capacitance of the second capacitor is greater than the capacitance of the third capacitor.

8. The energy storage system according to claim 7, characterized in that: The voltage detection module includes a second step-down transformer, a second rectifier bridge, a fourth capacitor, a fifth capacitor, a fourth resistor and a fifth resistor. The input end of the second step-down transformer is connected to the output end of the mutual inductor, the output end of the second step-down transformer is connected to the input end of the second rectifier bridge, the positive output end of the second rectifier bridge is connected to one end of the fourth capacitor, one end of the fifth capacitor and one end of the fourth resistor, the other end of the fourth resistor is connected to the processing module and one end of the fifth resistor, the negative output end of the second rectifier bridge serves as the second location, and the other end of the fourth capacitor, the other end of the fifth capacitor and the other end of the fifth resistor are all connected to the second location.

9. The energy storage system according to claim 8, characterized in that: The power generation module includes a generator set, a frequency converter and a second transformer. The frequency converter is respectively connected to the output end of the generator set and the input end of the second transformer. The output end of the second transformer is connected to the input end of the first transformer.

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