CN-121984043-A - Thermal power energy storage method and device adopting power electronic transformer

Abstract

The invention discloses an energy storage method and device adopting a power electronic transformer, which relate to the technical field of power electronic transformers and solve the problems of low energy conversion efficiency and large voltage fluctuation in the discharging process in the electricity storage process without fully considering the cooperation of energy consumption optimization and voltage matching precision; the dynamic adjustment capability breaks the limit of the fixed transformation ratio of the traditional transformer, so that the thermal power energy storage system can flexibly respond to voltage requirements under different energy storage states, and the running adaptability and the regulation flexibility of the system are obviously improved.

Inventors

• LIU BO
• CAO CHUANZHAO
• CHENG QIAN
• Duan Zhaorong
• WEI YU
• SONG JISHUO
• WANG NING
• ZHANG FUXIN
• CHEN WENBO
• YANG LINLIN
• GU YI
• LEI HAODONG
• CAO XI
• ZHOU LIREN
• LI XIAOCHEN
• TONG GUOPING
• ZHAO JUNLIANG
• LIU MINGYI

Assignees

• 华能国际电力股份有限公司上海石洞口第二电厂
• 中国华能集团清洁能源技术研究院有限公司

Dates

Publication Date

20260505

Application Date

20251204

Claims (10)

1. 1. The thermal power energy storage method adopting the power electronic transformer is characterized by comprising the following steps of: s1, confirming the energy storage electric quantity associated with a thermal power energy storage end at the current moment, and confirming the energy storage characteristics associated with the corresponding energy storage electric quantity from a history processing process; S2, identifying the running state of the thermal power energy storage end, and adjusting the number of turns of the coil in the transformer according to the energy storage characteristics associated with the thermal power energy storage end and the input voltage associated with the input end or the output voltage associated with the output end.
2. 2. The thermal power energy storage method adopting the power electronic transformer according to claim 1, wherein in S1, the specific way of confirming the corresponding energy storage characteristics of the energy storage electric quantity is as follows: Calibrating the energy storage electric quantity associated with the thermal power energy storage end at the current moment as CN, extracting the energy storage voltage associated with the energy storage electric quantity CN from the history processing process, and sequencing a plurality of groups of the associated energy storage voltages according to a mode of small value to large value to generate an energy storage voltage sequencing sequence; Randomly selecting a group of energy storage voltages as intermediate voltages ZY according to the confirmed energy storage voltage sequencing sequence, confirming voltage confirmation intervals [ ZY-Y1, ZY+Y1] according to a preset range value Y1, confirming the energy storage voltages belonging to the voltage confirmation intervals from the energy storage voltage sequencing sequence, and recording the confirmation numbers of the energy storage voltages as G i , wherein i represents different voltage confirmation intervals; According to the number G i of the confirmed energy storage voltages, adopting (G i ÷2Y1）=TZ i ) to confirm the interval characteristic TZ i associated with the corresponding voltage confirmation interval, selecting the maximum value from different interval characteristics TZ i associated with different voltage confirmation intervals, and taking the voltage confirmation interval associated with the maximum value as the selected interval; if there is only one group of the selected interval, the selected interval is used as the energy storage characteristic of the current energy storage electric quantity.
3. 3. The thermal power storage method using a power electronic transformer according to claim 2, wherein if there are a plurality of groups of selected sections, the intermediate value Z1 i of the corresponding selected section is confirmed, the intermediate value ZJ of the voltage confirmation section is confirmed, Z1 i nearest to ZJ is recorded as the selected value, and the selected section associated with the selected value is used as the energy storage characteristic of the current energy storage capacity.
4. 4. The thermal power energy storage method adopting the power electronic transformer according to claim 1, wherein in the step S2, if the current thermal power energy storage end is in a power storage state, the standard turn array is synchronously confirmed based on the input voltage and the energy storage characteristic confirmation selectable ratio, then the energy consumption characteristic associated with the standard turn array is confirmed, and the execution turns are locked.
5. 5. A thermal power storage method employing a power electronic transformer according to claim 4, wherein said performing a locking process of turns comprises: confirming an input voltage Vr associated with an input end of a thermal power energy storage end, extracting an energy storage characteristic associated with the current thermal power energy storage end, confirming a section minimum value Qmin and a section maximum value Qmax from the energy storage characteristic, confirming the to-be-determined occupation ratios ZBmin and ZBmax by adopting Vr/qmin= ZBmax and Vr/qmax= ZBmin, and directly generating occupation ratio sections [ ZBmin and ZBmax ]; Determining the total turns ZS1 of a primary coil and the total turns ZS2 of a secondary coil in the transformer, and adopting QS 1/QS2=QD locking to determine a ratio, wherein QS1 epsilon [1, ZS1], QS2 epsilon [1, ZS2], calibrating QDs with the determined ratio meeting QD epsilon [ ZBmin, ZBmax ] as selectable ratios, recording QS1 and QS2 associated with the single selectable ratio, and determining a plurality of standard turn arrays; According to the confirmed standard turn arrays, each standard turn array is subjected to test running for a group of preset periods, input current Dr is confirmed in the preset period associated with the corresponding standard turn array, and output voltage Vs and output current Ds of the transformer are synchronously confirmed; And (VrxDr) - (Vs xDs) =NH is adopted to confirm the energy consumption value NH associated with the corresponding standard-reaching turn array, and the energy consumption confirmation is sequentially carried out on other standard-reaching turn arrays, the energy consumption values NH associated with different standard-reaching turn arrays are locked, the minimum value is selected from the confirmed energy consumption values NH, the standard-reaching turn array associated with the minimum value is used as an execution turn number, the transformer is regulated according to the confirmed execution turn number, the current electricity storage process of the thermal power energy storage end is completed, and if the energy storage electric quantity associated with the subsequent thermal power energy storage end is changed, the execution turn number is confirmed again, so that the thermal power energy storage end achieves the optimal electricity storage state in the electricity storage process.
6. 6. The method according to claim 1, wherein in the second step, if the current thermal power storage terminal is in a discharging state, the number of turns to be executed is confirmed based on the discharging voltage and the power consumption voltage, a plurality of selected processes are confirmed according to the number of turns to be executed, the execution process is confirmed from the selected processes, and the number of turns to be executed is locked.
7. 7. A thermal power storage method employing a power electronic transformer according to claim 6, wherein said performing a locking process of turns comprises: the method comprises the steps of confirming discharge voltage related to a current thermal power energy storage end, and confirming preset electricity utilization voltage, wherein the electricity utilization voltage is a preset value; The method comprises the steps of adopting discharge voltage/electricity consumption voltage=XB to confirm an execution ratio XB, confirming execution turns according to the confirmed execution ratio XB, executing a plurality of selected processes, marking turns of secondary coils selected in the corresponding selected processes as ZZ1 k , marking turns of primary coils selected as ZZ2 k , wherein k represents different selected processes, adopting ZZ1 k ÷ZZ2 k =QB k to confirm an associated characteristic value QB k , carrying out difference processing on the confirmed associated characteristic values QB k and the confirmed execution ratio XB, and confirming a verification difference value, wherein the verification difference value is = |XB-QB k |; And selecting a minimum value from the plurality of groups of verification difference values according to the confirmed plurality of groups of verification difference values, taking the selected process associated with the minimum value as an execution process, taking ZZ1 k and ZZ2 k associated with the execution process as the execution turns, and adjusting the turns of the coil in the transformer.
8. 8. An energy storage device employing a power electronic transformer, the system operating according to a thermal power storage method employing a power electronic transformer as claimed in any one of claims 1 to 7, comprising: The energy storage characteristic confirmation end is used for confirming the energy storage electric quantity associated with the thermal power energy storage end at the current moment and confirming the energy storage characteristic associated with the corresponding energy storage electric quantity from the history processing process; The self-adaptive coil turn number adjusting end is used for identifying the running state of the thermal power energy storage end, and adjusting the coil turn number in the transformer according to the energy storage characteristics associated with the thermal power energy storage end and the input voltage associated with the input end or the output voltage associated with the output end.
9. 9. A computer device comprising a processor and a memory; Wherein the processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory for implementing a method of storing energy using a power electronic transformer as claimed in any one of claims 1-7.
10. 10. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements a method of storing energy using a power electronic transformer as claimed in any one of claims 1-7.

Description

Thermal power energy storage method and device adopting power electronic transformer Technical Field The invention relates to the technical field of power electronic transformers, in particular to a thermal power energy storage method and device adopting a power electronic transformer. Background In the operation process of the thermal power system, the introduction of an energy storage technology is a key means for improving the frequency modulation performance, absorbing the fluctuation power and enhancing the stability of a power grid. However, the conventional thermal power energy storage system has technical challenges in practical application, namely, the state of charge (SOC) of the energy storage device has strong correlation with voltage characteristics, voltage requirements under different energy storage percentages have differences, and if the voltage limits of the corresponding SOC cannot be matched accurately, safety risks such as overcharge and the like are easily caused, so that the service life and the operation safety of the energy storage device are influenced. Meanwhile, the existing energy storage voltage characteristic identification method depends on single parameters or experience values, and lacks a statistical analysis and interval accurate locking mechanism based on historical data, so that the accuracy of voltage characteristic judgment is insufficient, and on the basis of a transformer turns adjustment strategy, the traditional method often does not fully consider the cooperation of energy consumption optimization and voltage matching accuracy, the problems of low energy conversion efficiency in the electricity storage process, large voltage fluctuation in the discharging process and the like are outstanding, so that the overall operation efficiency of the thermal power energy storage system is restricted, and therefore, how to realize safe, efficient and stable operation of the thermal power energy storage system in different states through accurate energy storage voltage characteristic identification and dynamic transformer turns adjustment becomes an important subject to be solved in the development of the current thermal power energy storage technology. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a method for analyzing the flow rate, efficiency and water consumption rate of a generator set in a hydropower plant. Another object of the present invention is to provide an analysis device for flow, efficiency and water consumption rate of a generator set in a hydropower plant. A third object of the invention is to propose a computer device. A fourth object of the present invention is to propose a non-transitory computer readable storage medium. In order to achieve the above objective, an embodiment of a first aspect of the present invention provides a method for analyzing flow, efficiency and water consumption rate of a generator set in a hydropower plant, including: s1, confirming the energy storage electric quantity associated with a thermal power energy storage end at the current moment, and confirming the energy storage characteristics associated with the corresponding energy storage electric quantity from a history processing process, wherein the specific mode is as follows: Calibrating the energy storage electric quantity associated with the thermal power energy storage end at the current moment as CN, extracting the energy storage voltage associated with the energy storage electric quantity CN from the history processing process, and sequencing a plurality of groups of the associated energy storage voltages according to a mode of small value to large value to generate an energy storage voltage sequencing sequence; Randomly selecting a group of energy storage voltages as intermediate voltages ZY according to the confirmed energy storage voltage sequencing sequence, confirming voltage confirmation intervals [ ZY-Y1, ZY+Y1] according to a preset range value Y1, confirming the energy storage voltages belonging to the voltage confirmation intervals from the energy storage voltage sequencing sequence, and recording the confirmation numbers of the energy storage voltages as Gi, wherein i represents different voltage confirmation intervals; According to the confirmed energy storage voltage number Gi, adopting (Gi/2Y 1) =TZi to confirm the interval characteristic TZi associated with the corresponding voltage confirmation interval, selecting the maximum value from different interval characteristics TZi associated with different voltage confirmation intervals, and taking the voltage confirmation interval associated with the maximum value as the selected interval; If only one group exists in the selected interval, the selected interval is used as the energy storage characteristic of the current energy storage electric quantity; If a