Dynamic compensation type power grid transformation system applied to micro-grid connection

Abstract

The invention relates to the technical field of grid compensation power grid transformation, and discloses a dynamic compensation type power grid transformation system applied to micro-grid connection, which comprises a power grid data acquisition module and a power grid transformation control module. According to the dynamic compensation type power grid transformation system applied to microgrid grid connection, a voltage deviation value, real-time active power, apparent power and real-time reactive power are calculated according to collected real-time voltage data, real-time current data and real-time power factor data; the method comprises the following steps: calculating a voltage deviation value, real-time active power, apparent power and real-time reactive power, calculating a voltage compensation value according to the voltage deviation value, the real-time active power, the apparent power and the real-time reactive power, determining a required compensation amount by utilizing the voltage deviation and a voltage proportion so as to obtain the compensation amount required in a grid-connected process, and cleaning collected original data and then calculating to obtain the compensation amount required in a grid-connected process. And real-time compensation is carried out according to various actual parameters, so that the precision of calculating and executing the compensation amount is improved, and excessive compensation and insufficient compensation are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of grid-connected compensation power grid voltage transformation, and in particular to a dynamic compensation power grid voltage transformation system applied to microgrid connection. Background Art

[0002] The dynamic compensation grid transformer system for microgrid connection is a power system used to stabilize voltage, adjust power factor and control reactive power when the microgrid is connected to the main grid. Its main function is to ensure the stability of the grid and the quality of power through real-time monitoring and dynamic adjustment. Its application scenarios are also relatively wide, such as industrial parks and large commercial areas, photovoltaic power generation, wind power generation and other systems connected to the main grid; through the dynamic compensation grid transformer system for microgrid connection, various power quality problems that arise during the grid connection process can be effectively solved to ensure the safe and stable operation of the power grid;

[0003] The existing microgrid connection technology still has some defects in dynamic compensation and grid transformation. For example, the accuracy in calculating and executing the compensation amount is not high, which easily leads to over-compensation or under-compensation, affecting the power quality. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a dynamic compensation power grid transformer system for microgrid connection, which has the advantages of calculating voltage deviation value, real-time active power, apparent power and real-time reactive power according to collected real-time voltage data, real-time current data and real-time power factor data, and calculating voltage compensation value according to voltage deviation value, real-time active power, apparent power and real-time reactive power, determining required compensation amount by using voltage deviation and voltage ratio, thereby obtaining compensation amount required in the grid connection process, cleaning collected raw data before calculation, and performing real-time compensation according to actual parameters, thereby improving the accuracy of calculating and executing compensation amount, avoiding over-compensation and under-compensation, and solving the above-mentioned problems.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a dynamic compensation type grid voltage transformation system applied to microgrid connection, comprising a grid data acquisition module, a grid data processing module and a grid voltage transformation control module;

[0008] The power grid data acquisition module is composed of a real-time voltage data acquisition unit, a real-time current data acquisition unit and a real-time power factor acquisition unit;

[0009] The real-time voltage data acquisition unit is used to collect real-time voltage data Dy in the power grid, and form a corresponding real-time voltage data set according to a number of real-time voltage data Dy collected in each acquisition week;

[0010] The real-time current data acquisition unit is used to collect real-time current data D1 in the power grid, and form a corresponding real-time current data set according to a number of real-time current data D1 collected in each acquisition cycle;

[0011] The real-time power factor acquisition unit is used to collect real-time power factor data Gy in the power grid, and form a corresponding real-time power factor data set according to a number of real-time power factor data Gy collected in each acquisition cycle;

[0012] The power grid data acquisition module sends the formed multiple data sets to the power grid data processing module;

[0013] The power grid data processing module cleans the data in each data set to obtain the real-time voltage data mean. Real-time current data average And real-time power factor average The power grid data processing module calculates the rated voltage of the power grid transformer system and the real-time voltage data average value. Calculate the voltage deviation value PD, the power grid data processing module according to the real-time power factor data Real-time voltage data average and real-time current data average Calculate the real-time active power YG, and calculate the apparent power SG according to the calculated real-time active power YG, the power grid data processing module calculates the real-time reactive power WWG according to the apparent power SG, after the real-time reactive power WWG is calculated, the power grid data processing module calculates the voltage compensation value DB according to the real-time reactive power WWG, and sends the calculated voltage compensation value DB to the power grid transformer control module;

[0014] The grid voltage transformation control unit compensates the grid voltage transformation in real time according to the voltage compensation value DB.

[0015] Preferably, the real-time voltage data set expression is: {Dy1, Dy2, ..., Dy n}, the real-time current data set expression is: {Dy1, Dy2, ..., Dy n}, the real-time power factor data set expression is: {Gy1, Gy2, ..., Gy n}, and the collection period of each data set, the number of data in the data set, and the collection interval of each data set are the same.

[0016] Preferably, the real-time voltage data mean The calculation expression is as follows:

[0017]

[0018] In the formula, n in the denominator indicates that there are n data in the real-time voltage data set, i=1 indicates that the calculation starts from the first data in the real-time voltage data set, and n in the numerator indicates that the calculation ends at the nth data in the data set.

[0019] Preferably, the real-time current data mean The calculation expression is as follows:

[0020]

[0021] In the formula, n in the denominator indicates that there are n data in the real-time current data set, i=1 indicates that the calculation starts from the first data in the real-time current data set, and n in the numerator indicates that the calculation ends at the nth data in the data set.

[0022] Preferably, the real-time power factor data The calculation expression is as follows:

[0023]

[0024] In the formula, n in the denominator indicates that there are n data in the real-time power factor data set, i=1 indicates that the calculation starts from the first data in the real-time power factor data set, and n in the numerator indicates that the calculation ends at the nth data in the data set.

[0025] Preferably, the real-time active power YG calculation expression is as follows:

[0026]

[0027] The meaning of the formula is based on real-time power factor data Real-time voltage data average and real-time current data average Calculate real-time active power.

[0028] Preferably, the calculation expression of the apparent power SG is as follows:

[0029]

[0030] The real-time reactive power WWG calculation expression is as follows:

[0031]

[0032] The formula means that the real-time reactive power WWG is calculated based on the real-time active power YG and apparent power SG calculated according to the relationship of the power triangle.

[0033] Preferably, the voltage deviation value PD is calculated as follows:

[0034]

[0035] In the formula, Dy ed represents the rated voltage of the grid transformer system. The voltage deviation value is obtained by the difference.

[0036] Preferably, the voltage compensation value DB is calculated as follows:

[0037]

[0038] In the formula, Dy ed represents the rated voltage of the grid transformer system. The formula means the amount of reactive power required to adjust the real-time voltage to the rated voltage, that is, the required compensation amount is determined by the voltage deviation value and the rated voltage ratio, which is the voltage compensation value.

[0039] Preferably, the voltage compensation value DB calculated by the power grid data processing module is sent to the power grid voltage transformation control module, and the power grid voltage transformation control module adjusts and compensates the power grid voltage according to the value of the voltage compensation value DB.

[0040] Compared with the prior art, the present invention provides a dynamic compensation grid transformer system for microgrid connection, which has the following beneficial effects:

[0041] The present invention calculates voltage deviation value, real-time active power, apparent power and real-time reactive power according to collected real-time voltage data, real-time current data and real-time power factor data respectively, and calculates voltage compensation value according to voltage deviation value, real-time active power, apparent power and real-time reactive power, determines required compensation amount by using voltage deviation and voltage ratio, and thus obtains compensation amount required in the grid connection process, cleans collected raw data before calculation, and performs real-time compensation according to actual parameters, thereby improving the accuracy of calculating and executing compensation amount and avoiding over-compensation and under-compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1 , a dynamic compensation type grid voltage transformation system applied to microgrid connection, including a grid data acquisition module, a grid data processing module and a grid voltage transformation control module;

[0045] Wherein: the power grid data acquisition module is composed of a real-time voltage data acquisition unit, a real-time current data acquisition unit and a real-time power factor acquisition unit;

[0046] The real-time voltage data acquisition unit is used to collect the real-time voltage data Dy in the power grid, and form a corresponding real-time voltage data set according to a number of real-time voltage data Dy collected in each acquisition week, wherein the real-time voltage data set expression is: {Dy1, Dy2, ..., Dy n};

[0047] The real-time current data acquisition unit is used to collect the real-time current data D1 in the power grid, and form a corresponding real-time current data set according to the real-time current data D1 collected in each acquisition cycle, wherein the real-time current data set expression is: {Dy1, Dy2, ..., Dy n};

[0048] The real-time power factor acquisition unit is used to collect the real-time power factor data Gy in the power grid, and form a corresponding real-time power factor data set according to a number of real-time power factor data Gy collected in each acquisition cycle, wherein the real-time power factor data set expression is: {Gy1, Gy2, ..., Gy n};

[0049] The power grid data acquisition module sends the formed multiple data sets to the power grid data processing module.

[0050] The collection period of each data set, the number of data in the data set, and the collection interval of each data set are the same, thereby ensuring that the original data are on the same time axis, which is beneficial to subsequent calculations.

[0051] The power grid data processing module cleans the data in each data set and obtains the real-time voltage data mean. Real-time current data average And real-time power factor average The specific calculation expressions are as follows:

[0052] Real-time voltage data average The calculation expression is as follows:

[0053]

[0054] In the formula, n in the denominator means that there are n data in the real-time voltage data set, i=1 means that the calculation starts from the first data in the real-time voltage data set, and n in the numerator means that the calculation ends at the nth data in the data set;

[0055] Real-time current data average The calculation expression is as follows:

[0056]

[0057] In the formula, n in the denominator means that there are n data in the real-time current data set, i=1 means that the calculation starts from the first data in the real-time current data set, and n in the numerator means that the calculation ends at the nth data in the data set;

[0058] Real-time power factor data The calculation expression is as follows:

[0059]

[0060] In the formula, n in the denominator indicates that there are n data in the real-time power factor data set, i=1 indicates that the calculation starts from the first data in the real-time power factor data set, and n in the numerator indicates that the calculation ends at the nth data in the data set;

[0061] By cleaning the data in each data set, the impact of abnormal data in the data set on the results of subsequent calculations can be reduced, making the results of subsequent calculations closer to the actual values;

[0062] The power grid data processing module calculates the rated voltage and real-time voltage data of the power grid transformer system. Calculate the voltage deviation value PD, the specific calculation expression is as follows:

[0063] The voltage deviation value PD calculation expression is as follows:

[0064]

[0065] In the formula, Dy ed represents the rated voltage of the grid transformer system. The difference between the voltage and the deviation is obtained;

[0066] The power grid data processing module is based on real-time power factor data Real-time voltage data average and real-time current data average Calculate the real-time active power YG, and its specific calculation expression is as follows:

[0067]

[0068] The meaning of the formula is based on real-time power factor data Real-time voltage data average and real-time current data average Calculate real-time active power;

[0069] The apparent power SG is calculated based on the calculated real-time active power YG. The specific calculation expression is as follows:

[0070]

[0071] The power grid data processing module calculates the real-time reactive power WWG based on the apparent power SG. The specific calculation expression is as follows:

[0072]

[0073] The meaning of the formula is that the real-time reactive power WWG is calculated based on the real-time active power YG and apparent power SG calculated according to the relationship of the power triangle;

[0074] After the real-time reactive power WWG is calculated, the power grid data processing module calculates the voltage compensation value DB according to the real-time reactive power WWG. The specific calculation is as follows:

[0075]

[0076] In the formula, Dy ed represents the rated voltage of the grid transformer system. The formula means the reactive power required to adjust the real-time voltage to the rated voltage, that is, the required compensation amount is determined by the voltage deviation value and the rated voltage ratio, which is the voltage compensation value;

[0077] After the voltage compensation value DB is calculated, the voltage compensation value DB calculated by the power grid data processing module is sent to the power grid voltage transformation control module, and the power grid voltage transformation control module adjusts and compensates the power grid voltage according to the value of the voltage compensation value DB.

[0078] By collecting real-time voltage data, real-time current data and real-time power factor data, and calculating the voltage deviation value, real-time active power, apparent power and real-time reactive power respectively based on these data, and calculating the voltage compensation value based on the voltage deviation value, real-time active power, apparent power and real-time reactive power, and determining the required compensation amount by using the voltage deviation and voltage ratio, the compensation amount required in the grid connection process is obtained, and the collected original data is cleaned before calculation, and real-time compensation is performed according to the actual parameters, thereby improving the accuracy of calculating and executing the compensation amount and avoiding over-compensation and under-compensation.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic compensation grid transformer system for microgrid connection, characterized in that: It includes a power grid data acquisition module, a power grid data processing module and a power grid voltage transformation control module; The power grid data acquisition module is composed of a real-time voltage data acquisition unit, a real-time current data acquisition unit and a real-time power factor acquisition unit; The real-time voltage data acquisition unit is used to collect real-time voltage data Dy in the power grid, and form a corresponding real-time voltage data set according to a number of real-time voltage data Dy collected in each acquisition week; The real-time current data acquisition unit is used to collect real-time current data D1 in the power grid, and form a corresponding real-time current data set according to a number of real-time current data D1 collected in each acquisition cycle; The real-time power factor acquisition unit is used to collect real-time power factor data Gy in the power grid, and form a corresponding real-time power factor data set according to a number of real-time power factor data Gy collected in each acquisition cycle; The power grid data acquisition module sends the formed multiple data sets to the power grid data processing module; The power grid data processing module cleans the data in each data set to obtain the real-time voltage data mean. Real-time current data average And real-time power factor average The power grid data processing module calculates the rated voltage of the power grid transformer system and the real-time voltage data average value. Calculate the voltage deviation value PD, the power grid data processing module according to the real-time power factor data Real-time voltage data average and real-time current data average Calculate the real-time active power YG, and calculate the apparent power SG according to the calculated real-time active power YG, the power grid data processing module calculates the real-time reactive power WWG according to the apparent power SG, after the real-time reactive power WWG is calculated, the power grid data processing module calculates the voltage compensation value DB according to the real-time reactive power WWG, and sends the calculated voltage compensation value DB to the power grid transformer control module; The grid voltage transformation control module compensates the grid voltage transformation in real time according to the voltage compensation value DB.

2. A dynamic compensation power grid transformer system for microgrid connection according to claim 1, characterized in that: The real-time voltage data set expression is: {Dy1, Dy2, ..., Dy n }, the real-time current data set expression is: {Dy1, Dy2, ..., Dy n }, the real-time power factor data set expression is: {Gy1, Gy2, ..., Gy n }, and the collection period of each data set, the number of data in the data set, and the collection interval of each data set are the same.

3. A dynamic compensation type grid transformer system for microgrid connection according to claim 2, characterized in that: The real-time voltage data mean The calculation expression is as follows: In the formula, n in the denominator indicates that there are n data in the real-time voltage data set, i=1 indicates that the calculation starts from the first data in the real-time voltage data set, and n in the numerator indicates that the calculation ends at the nth data in the data set.

4. A dynamic compensation type grid transformer system for microgrid connection according to claim 3, characterized in that: The real-time current data average The calculation expression is as follows: In the formula, n in the denominator indicates that there are n data in the real-time current data set, i=1 indicates that the calculation starts from the first data in the real-time current data set, and n in the numerator indicates that the calculation ends at the nth data in the data set.

5. The dynamic compensation type grid transformer system for microgrid connection according to claim 4, characterized in that: The real-time power factor data The calculation expression is as follows: In the formula, n in the denominator indicates that there are n data in the real-time power factor data set, i=1 indicates that the calculation starts from the first data in the real-time power factor data set, and n in the numerator indicates that the calculation ends at the nth data in the data set.

6. A dynamic compensation type grid transformer system for microgrid connection according to claim 5, characterized in that: The real-time active power YG calculation expression is as follows: The meaning of the formula is based on real-time power factor data Real-time voltage data average and real-time current data average Calculate real-time active power.

7. A dynamic compensation type grid transformer system for microgrid connection according to claim 6, characterized in that: The apparent power SG is calculated as follows: The real-time reactive power WWG calculation expression is as follows: The formula means that the real-time reactive power WWG is calculated based on the real-time active power YG and apparent power SG calculated according to the relationship of the power triangle.

8. The dynamic compensation type grid transformer system for microgrid connection according to claim 7, characterized in that: The voltage deviation value PD calculation expression is as follows: In the formula, Dy ed represents the rated voltage of the grid transformer system. The voltage deviation value is obtained by the difference.

9. A dynamic compensation type grid transformer system for microgrid connection according to claim 8, characterized in that: The voltage compensation value DB is calculated as follows: In the formula, Dy ed represents the rated voltage of the grid transformer system. The formula means the amount of reactive power required to adjust the real-time voltage to the rated voltage, that is, the required compensation amount is determined by the voltage deviation value and the rated voltage ratio, which is the voltage compensation value.

10. A dynamic compensation type grid transformer system for microgrid connection according to claim 9, characterized in that: The voltage compensation value DB calculated by the power grid data processing module is sent to the power grid voltage transformation control module, and the power grid voltage transformation control module adjusts and compensates the power grid voltage according to the value of the voltage compensation value DB.

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