Power grid operation mode voltage automatic adjustment method and system suitable for different new energy coincidence rates

Abstract

The invention discloses a power grid operation mode voltage automatic adjustment method and system suitable for different new energy coincidence rates, and belongs to the technical field of power systems. According to the method, series compensation and parallel compensation of a plant station with an out-of-limit bus in a third power flow result are output, a capacitor is automatically input or reactance is automatically quitted from the plant station with the voltage exceeding the lower limit according to the difference between the voltage and the limit voltage, and a reactive power is automatically output from the plant station with the voltage exceeding the upper limit according to the difference between the voltage and the limit voltage. And the capacitor is automatically withdrawn or the reactance is input. According to the invention, under the condition that the voltage cannot be adjusted, surrounding reactive power resources can be automatically adjusted, the terminal voltage of a new energy machine is cooperatively adjusted, and the voltage of a high voltage level can be automatically switched to a target level through series-parallel compensation.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and more specifically, to a method and system for automatic voltage adjustment applicable to power grid operation modes with different new energy simultaneous rates. Background Technology

[0002] my country's energy structure is undergoing a critical stage of profound transformation. In 2011, the structure was still dominated by traditional energy sources, with thermal power accounting for over 70% of installed capacity, hydropower as the second largest power source accounting for over 20%, while new energy sources such as wind power and solar power accounted for less than 5% combined, with solar power accounting for only 0.2%. After more than a decade of continuous reshaping, by the end of 2024, the total installed power generation capacity in China had climbed to 3.35 billion kilowatts, with new energy power generation capacity, including wind power, solar power, and biomass energy, reaching 1.45 billion kilowatts, historically surpassing the 1.44 billion kilowatts of thermal power capacity; non-fossil energy capacity further increased to 1.95 billion kilowatts, accounting for 58.2%, while the share of thermal power decreased to 35.7%.

[0003] As the proportion of renewable energy connected to the grid continues to rise, the operational pressure at the grid's lower ends is significantly increasing. Compared to traditional power generating units, renewable energy units have limited regulation capabilities and relatively insufficient high and low voltage ride-through performance. Furthermore, the performance of their associated reactive power compensation devices varies considerably, leading to increasingly prominent voltage stability issues in areas with concentrated renewable energy grid connection. When a fault occurs, it can easily trigger large-scale cascading grid disconnections, or even cause system voltage instability, seriously threatening grid security.

[0004] To address the complex challenges posed to the power grid by the large-scale development of new energy sources, we have established a routine power system simulation analysis mechanism. Through the systematic application of simulation software each year, we conduct simulation calculations for various scenarios and operating modes, considering different seasons, load levels, and the output characteristics of new energy sources. This enables proactive assessment and precise prevention of potential risks to the power grid. In the simulation calculations, to maintain a conservative safety margin for the power grid, we have not built SVG models on the new energy side to avoid overly optimistic results due to their ideal voltage regulation performance, which could lead to excessively difficult voltage regulation. Summary of the Invention

[0005] To address the above problems, this invention proposes an automatic voltage adjustment method for power grid operation modes with different renewable energy simultaneous rates, comprising:

[0006] Based on the actual location of the SVG in the power system, a load model is established on the bus connected to the SVG, and the reactive power upper limit Q of the load model is set according to the reactive power adjustment range of the SVG. max and the lower limit of reactive power Q min ;

[0007] Based on the target range of the terminal voltage of new energy generating units in the power system, calculate the load adjustment target value U of SVG. 21 And U 22 According to the U 21 And U 22 Set the target voltage value for the load;

[0008] After adjusting the output of new energy sources and achieving power balance, according to the aforementioned U 21 And U 22 Set the target voltage value U2 for the load and designate the load model as PV-PQ type. Perform power flow calculation based on U2 to obtain the first power flow result.

[0009] Based on the first power flow result, the output of the over-limit bus at the generator terminal voltage and the set target voltage level is adjusted. For new energy generator terminal buses with generator terminal voltages exceeding the lower limit, the corresponding SVG load target voltage is adjusted to U. 22 For new energy generator terminal buses where the terminal voltage exceeds the upper limit, the corresponding SVG load target voltage will be adjusted to U. 21 And perform power flow calculations to obtain the second power flow result;

[0010] Based on the second power flow results, the output of the over-limit bus at the generator terminal voltage and the set target voltage level will be adjusted. For new energy generator terminal buses that exceed the voltage limit again, the current reactive power value and Q will be considered. max and Q min The difference is used to calculate whether there is adjustable space;

[0011] If the voltage at the new energy generator terminal falls below the lower limit, the Q of the SVG load will decrease. up =0, no adjustable space, find two levels of topology outward from the current station, and adjust the target value of the SVG load of the found neighboring stations to U. 22 If the voltage at the new energy generator terminal exceeds the upper limit, the target value of the SVG load at the nearest station will be found and adjusted to U. 21 Then, power flow calculation is performed. After the power flow calculation is completed, the third power flow result is obtained, and the load model is changed to the PQ model.

[0012] In the third power flow result, for substations with buses exceeding the limit, the series compensation and parallel compensation outputs will be used. For substations with voltages below the lower limit, the capacitors will be automatically switched on or the reactors will be switched off based on the difference between the voltage and the limit voltage. For substations with voltages above the upper limit, the capacitors will be automatically switched off or the reactors will be switched on based on the difference between the voltage and the limit voltage.

[0013] Optional, U 21 The calculation formula is as follows:

[0014]

[0015] Among them, U21 U is the lower limit of the SVG load adjustment target. 11 As the lower limit of the target voltage adjustment at the generator terminals, P1, R T Q1, X T Both P1 and k are variables connecting the transformer between the new energy generator and the SVG load, where P1 is the active power on the low-voltage side of the transformer, and R is the active power on the low-voltage side. T The main transformer's resistance, Q1 is the reactive power on the low-voltage side of the transformer, X T The reactance of the main transformer is k, and the turns ratio of the main transformer is k.

[0016] Optional, U 22 The calculation formula is as follows:

[0017]

[0018] Among them, U 22 Adjust the target upper limit for SVG load, U 12 To adjust the target upper limit of the terminal voltage, P1, R T Q1, X T Both P1 and k are variables connecting the transformer between the new energy generator and the SVG load, where P1 is the active power on the low-voltage side of the transformer, and R is the active power on the low-voltage side. T The main transformer's resistance, Q1 is the reactive power on the low-voltage side of the transformer, X T The reactance of the main transformer is k, and the turns ratio of the main transformer is k.

[0019] Optionally, the formula for calculating U2 is as follows:

[0020]

[0021] Where U2 is the target voltage value of the SVG load, U 21 Adjust the target upper limit for SVG load, U 22 Adjust the target lower limit for SVG load.

[0022] Optional, adjustable space upward adjustment space Q up =Q max -Q, lowering the space Q down =QQ min ;

[0023] Among them, Q up Q provides room for reactive power adjustment. max Q is the upper limit of reactive power, and Q is the current reactive power value. down Q provides room for reactive power reduction. min This is the lower limit value for reactive power.

[0024] Furthermore, this invention also proposes an automatic voltage adjustment system suitable for different power grid operation modes with varying new energy concurrent rates, comprising:

[0025] The initial unit is used to establish a load model on the bus connected to the SVG based on the actual location of the SVG in the power system, and to set the upper limit Q of the reactive power of the load model according to the reactive power adjustment range of the SVG. max and the lower limit of reactive power Q min Based on the target range of the terminal voltage of new energy generating units in the power system, calculate the load adjustment target value U of the SVG. 21 And U 22 According to the U 21 And U 22 Set the target voltage value for the load;

[0026] The power flow calculation unit is used to adjust the output of new energy sources and achieve power balance, based on the U... 21 And U 22 Set the target voltage value U2 for the load and designate the load model as PV-PQ type. Perform power flow calculation based on U2 to obtain the first power flow result. According to the first power flow result, output the extreme voltage and the over-limit bus with the set voltage target voltage level. For new energy generator terminal buses with terminal voltages exceeding the lower limit, adjust the corresponding SVG load target voltage to U2. 22 For new energy generator terminal buses where the terminal voltage exceeds the upper limit, the corresponding SVG load target voltage will be adjusted to U. 21 The system performs power flow calculations to obtain the second power flow result. Based on the second power flow result, it outputs the over-limit bus voltage and the set target voltage level. For new energy generator terminal buses that over-limit again, the system calculates the current reactive power value and Q. max and Q min The difference is used to calculate whether there is adjustable space; if the voltage at the new energy generator terminal falls below the lower limit, the Q of the SVG load... up =0, no adjustable space, find two levels of topology outward from the current station, and adjust the target value of the SVG load of the found neighboring stations to U. 22 If the voltage at the new energy generator terminal exceeds the upper limit, the target value of the SVG load at the nearest station will be found and adjusted to U. 21 Then, power flow calculation is performed. After the power flow calculation is completed, the third power flow result is obtained, and the load model is changed to the PQ model.

[0027] The adjustment unit is used to output the series and parallel compensation of the substations with over-limit buses in the third power flow result, and to automatically add capacitors or remove reactors for substations with voltages below the lower limit according to the difference between the voltage and the limit voltage, and to automatically remove capacitors or add reactors for substations with voltages above the upper limit according to the difference between the voltage and the limit voltage.

[0028] Optional, U 21 The calculation formula is as follows:

[0029]

[0030] Among them, U 21 U is the lower limit of the SVG load adjustment target. 11 As the lower limit of the target voltage adjustment at the generator terminals, P1, R T Q1, X T Both P1 and k are variables connecting the transformer between the new energy generator and the SVG load, where P1 is the active power on the low-voltage side of the transformer, and R is the active power on the low-voltage side. T The main transformer's resistance, Q1 is the reactive power on the low-voltage side of the transformer, X T The reactance of the main transformer is k, and the turns ratio of the main transformer is k.

[0031] Optional, U 22 The calculation formula is as follows:

[0032]

[0033] Among them, U 22 Adjust the target upper limit for SVG load, U 12 To adjust the target upper limit of the terminal voltage, P1, R T Q1, X T Both P1 and k are variables connecting the transformer between the new energy generator and the SVG load, where P1 is the active power on the low-voltage side of the transformer, and R is the active power on the low-voltage side. T The main transformer's resistance, Q1 is the reactive power on the low-voltage side of the transformer, X T The reactance of the main transformer is k, and the turns ratio of the main transformer is k.

[0034] Optionally, the formula for calculating U2 is as follows:

[0035]

[0036] Where U2 is the target voltage value of the SVG load, U 21 Adjust the target upper limit for SVG load, U 22 Adjust the target lower limit for SVG load.

[0037] Optional, adjustable space upward adjustment space Q up =Q max -Q, lowering the space Q down =QQ min ;

[0038] Among them, Q up Q provides room for reactive power adjustment. max Q is the upper limit of reactive power, and Q is the current reactive power value. down Q provides room for reactive power reduction. min This is the lower limit value for reactive power.

[0039] In another aspect, the present invention also provides a computing device, comprising: one or more processors;

[0040] A processor is used to execute one or more programs;

[0041] When the one or more programs are executed by the one or more processors, the method described above is implemented.

[0042] In another aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the method described above.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0044] This invention provides an automatic voltage adjustment method for power grid operation modes with different renewable energy simultaneous rates, comprising: establishing a load model on the bus connected to the SVG based on the actual location of the SVG in the power system, and setting the reactive power upper limit Q of the load model according to the reactive power adjustment range of the SVG. max and the lower limit of reactive power Q min Based on the target range of the terminal voltage of new energy generating units in the power system, calculate the load adjustment target value U of the SVG. 21 And U 22 According to the U 21 And U 22 Set the target voltage value for the load; after adjusting the output of new energy sources and achieving power balance, according to the U... 21 And U 22 Set the target voltage value U2 for the load and designate the load model as PV-PQ type. Perform power flow calculation based on U2 to obtain the first power flow result. According to the first power flow result, output the generator terminal voltage and the over-limit bus with the set target voltage level. For new energy generator terminal buses with generator terminal voltages exceeding the lower limit, adjust the corresponding SVG load target voltage to U2. 22 For new energy generator terminal buses where the terminal voltage exceeds the upper limit, the corresponding SVG load target voltage will be adjusted to U. 21 The system performs power flow calculations to obtain the second power flow result. Based on the second power flow result, it outputs the over-limit bus voltage and the set target voltage level. For new energy generator terminal buses that over-limit again, the system calculates the current reactive power value and Q. max and Q min The difference is used to calculate whether there is adjustable space; if the voltage at the new energy generator terminal falls below the lower limit, the Q of the SVG load... up =0, no adjustable space, find two levels of topology outward from the current station, and adjust the target value of the SVG load of the found neighboring stations to U. 22If the voltage at the new energy generator terminal exceeds the upper limit, the target value of the SVG load at the nearest station will be found and adjusted to U. 21 Then, power flow calculation is performed. After the power flow calculation is completed, the third power flow result is obtained, and the load model is changed to a PQ model. For substations with over-limit buses in the third power flow result, series and parallel compensation outputs are provided. For substations with voltages below the lower limit, capacitors are automatically added or reactors are deactivated based on the difference between the voltage and the limit voltage. For substations with voltages above the upper limit, capacitors are automatically deactivated or reactors are added based on the difference between the voltage and the limit voltage. This invention can automatically mobilize surrounding reactive power resources to coordinately adjust the voltage at the new energy generator terminals when the voltage cannot be adjusted, and can automatically switch series and parallel compensation to adjust the voltage of high-voltage levels to the target level. Attached Figure Description

[0045] Figure 1 This is a flowchart of the method of the present invention;

[0046] Figure 2 This is a structural diagram of the system of the present invention. Detailed Implementation

[0047] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0048] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0049] Example 1:

[0050] This invention proposes an automatic voltage adjustment method applicable to power grid operation modes with different renewable energy simultaneous rates, such as... Figure 1 As shown, it includes:

[0051] Based on the actual location of the SVG in the power system, a load model is established on the bus connected to the SVG, and the reactive power upper limit Q of the load model is set according to the reactive power adjustment range of the SVG. max and the lower limit of reactive power Q min ;

[0052] Based on the target range of the terminal voltage of new energy generating units in the power system, calculate the load adjustment target value U of SVG. 21 And U 22 According to the U 21 And U 22 Set the target voltage value for the load;

[0053] After adjusting the output of new energy sources and achieving power balance, according to the aforementioned U 21 And U 22 Set the target voltage value U2 for the load and designate the load model as PV-PQ type. Perform power flow calculation based on U2 to obtain the first power flow result.

[0054] Based on the first power flow results, for the extreme voltage and the bus output exceeding the set voltage target level, for the new energy generator terminal bus where the generator terminal voltage exceeds the lower limit, the corresponding SVG load target voltage is adjusted to U. 22 For new energy generator terminal buses where the terminal voltage exceeds the upper limit, the corresponding SVG load target voltage will be adjusted to U. 21 And perform power flow calculations to obtain the second power flow result;

[0055] Based on the second power flow results, the output of the over-limit bus at the generator terminal voltage and the set target voltage level will be adjusted. For new energy generator terminal buses that exceed the voltage limit again, the current reactive power value and Q will be considered. max and Q min The difference is used to calculate whether there is adjustable space;

[0056] If the voltage at the new energy generator terminal falls below the lower limit, the Q of the SVG load will decrease. up =0, no adjustable space, find two levels of topology outward from the current station, and adjust the target value of the SVG load of the found neighboring stations to U. 22 If the voltage at the new energy generator terminal exceeds the upper limit, the target value of the SVG load at the nearest station will be found and adjusted to U. 21 Then, power flow calculation is performed. After the power flow calculation is completed, the third power flow result is obtained, and the load model is changed to the PQ model.

[0057] In the third power flow result, for substations with buses exceeding the limit, the series compensation and parallel compensation outputs will be used. For substations with voltages below the lower limit, the capacitors will be automatically switched on or the reactors will be switched off based on the difference between the voltage and the limit voltage. For substations with voltages above the upper limit, the capacitors will be automatically switched off or the reactors will be switched on based on the difference between the voltage and the limit voltage.

[0058] Optional, U 21 The calculation formula is as follows:

[0059]

[0060] Among them, U21 U is the lower limit of the SVG load adjustment target. 11 As the lower limit of the target voltage adjustment at the generator terminals, P1, R T Q1, X T Both P1 and k are variables connecting the transformer between the new energy generator and the SVG load, where P1 is the active power on the low-voltage side of the transformer, and R is the active power on the low-voltage side. T The main transformer's resistance, Q1 is the reactive power on the low-voltage side of the transformer, X T The reactance of the main transformer is k, and the turns ratio of the main transformer is k.

[0061] Optional, U 22 The calculation formula is as follows:

[0062]

[0063] Among them, U 22 Adjust the target upper limit for SVG load, U 12 To adjust the target upper limit of the terminal voltage, P1, R T Q1, X T Both P1 and k are variables connecting the transformer between the new energy generator and the SVG load, where P1 is the active power on the low-voltage side of the transformer, and R is the active power on the low-voltage side. T The main transformer's resistance, Q1 is the reactive power on the low-voltage side of the transformer, X T The reactance of the main transformer is k, and the turns ratio of the main transformer is k.

[0064] Optionally, the formula for calculating U2 is as follows:

[0065]

[0066] Where U2 is the target voltage value of the SVG load, U 21 Adjust the target upper limit for SVG load, U 22 Adjust the target lower limit for SVG load.

[0067] Optional, adjustable space upward adjustment space Q up =Q max -Q, lowering the space Q down =QQ min ;

[0068] Among them, Q up Q provides room for reactive power adjustment. max Q is the upper limit of reactive power, and Q is the current reactive power value. down Q provides room for reactive power reduction. min This is the lower limit value for reactive power.

[0069] The invention will be further explained below with reference to specific implementation examples:

[0070] The implementation process includes:

[0071] Based on the actual location of the SVG model, a load model is built on the SVG connection bus. Based on the reactive power adjustment range of the SVG, the upper limit of reactive power Q of the load model is set. max and the lower limit of reactive power Q min ;

[0072] According to the target range of the generator terminal voltage of new energy units (U 11 ~U 12 ), calculate the SVG load adjustment target value U 21 U 22 The target voltage value for the load is set according to U2;

[0073]

[0074] After adjusting the output of new energy sources and ensuring power balance, set the voltage target value of the SVG load to U2, adjust the load model to PV-PQ type, and perform power flow calculations.

[0075] Based on the power flow results, the over-limit bus output at the machine terminal and the set voltage target voltage level will be adjusted.

[0076] For new energy generator terminal buses with terminal voltages below the lower limit, the corresponding SVG load target voltage will be adjusted to U. 22 For new energy generator terminal buses where the terminal voltage exceeds the upper limit, the corresponding SVG load target voltage will be adjusted to U. 21 And perform power flow calculations;

[0077] Based on the power flow results, output the over-limit buses at the generator terminals and those exceeding the target voltage level; for generator terminal buses that are still over-limit, output the over-limit buses based on the current reactive power value and Q. max and Q min The difference is used to calculate whether there is still room for adjustment, and the adjustment space Q is calculated. up =Q max -Q, lowering the space Q down =QQ min .

[0078] If the terminal voltage remains below the limit, the Q of the SVG load... up =0, there is no room for adjustment, so it is necessary to find two levels of topology outward from the current station, and adjust the target value of the SVG load of the found neighboring stations to its upper limit value U. 22 If the generator terminal voltage remains above the limit, the target value of the SVG load at a nearby station will be found and adjusted to its lower limit U. 21 Then, power flow calculation is performed. After the power flow calculation is completed, the SVG load model is changed to the PQ model.

[0079] In the power flow calculation results, both series compensation and parallel compensation for substations with over-limit buses will be output. Substations with voltages below the lower limit will automatically add capacitors or remove reactors based on the difference between the voltage and the limit voltage. Substations with voltages above the upper limit will automatically remove capacitors or add reactors based on the difference between the voltage and the limit voltage.

[0080] This invention can automatically mobilize surrounding reactive power resources to coordinate and adjust the generator terminal voltage when the voltage cannot be adjusted, and can automatically switch series and parallel to adjust the voltage of high voltage levels to the target level, thus solving the voltage adjustment problem under the high renewable energy simultaneous rate in annual calculation.

[0081] This invention uses annual data from Northeast China. The adjustment effect is shown below: the number of out-of-limit transactions has decreased significantly, improving the adjustment efficiency for calculation personnel. The results are shown in Table 1.

[0082] Table 1

[0083]

[0084] The specific calculation process is as follows:

[0085] Obtain the data for the adjustment method. The data has been added to the model side with the corresponding SVG load and the upper and lower limits of reactive power have been provided. The wind power simultaneity rate has been adjusted to 30%.

[0086] Calculate the target value for SVG load adjustment based on the lower limit value U of the new energy generator terminal voltage. 11 Upper limit U 12 Calculate the target value of the SVG load that needs to be converted to 35kV:

[0087]

[0088] For wind farm A, the lower limit of the turbine terminal voltage is set to U. 11 =0.98, upper limit is U 12 =1.02, P1=0.148, Q1=0, R T =0.012, X T =0.126, k=1.05, calculated U 21 =1.0271, U 22 =1.0692, U2=1.0482;

[0089] Change the target value of the SVG load to U2 and change the type of the SVG load to PV-PQ. Perform power flow calculation and, based on the power flow results, output the loads at the generator terminals and the over-limit buses with set voltage targets.

[0090] Even after the aforementioned adjustments, wind farm B still exceeded the lower limit. 21 =1.078, U 22=1.122, after resetting U2 = 1.122 and performing power flow calculations, the terminal voltage is still lower than the target value, and Q up =Q max -Q=0, there is no room for adjustment. Adjust U2=1.0781 for wind farm C and U2=1.071 for wind farm D, recalculate the power flow, and change the type of SVG load to PQ.

[0091] In the power flow results, the 220kV bus at station E exceeds the upper limit, with a voltage value of 1.098 pu., while the 500kV bus at station F exceeds the lower limit, with a voltage value of 0.991 pu. Station E searches for two levels of topology, namely stations E1 and E2. The series and parallel compensations within stations E, E1, and E2 are found, and the 220kV series and parallel compensations are output to a file. The series compensation is then automatically activated or the parallel compensation is deactivated. Similarly, station F searches for two levels of topology, namely stations F1 and F2. The series and parallel compensations within stations F, F1, and F2 are found, and the 500kV series and parallel compensations are output to a file. The parallel compensation is then automatically activated or the series compensation is deactivated.

[0092] Power flow calculations, including bus conditions and power flow data where the output voltage still exceeds the limit.

[0093] Example 2:

[0094] Furthermore, this invention also proposes an automatic voltage adjustment system 200 suitable for power grid operation modes with different renewable energy simultaneous rates, such as... Figure 2 As shown, it includes:

[0095] Initialization unit 201 is used to establish a load model on the bus connected to the SVG based on the actual location of the SVG in the power system, and to set the upper limit Q of the reactive power of the load model according to the reactive power adjustment range of the SVG. max and the lower limit of reactive power Q min Based on the target range of the terminal voltage of new energy generating units in the power system, calculate the load adjustment target value U of the SVG. 21 And U 22 According to the U 21 And U 22 Set the target voltage value for the load;

[0096] The power flow calculation unit 202 is used to adjust the output of new energy sources and achieve power balance, based on the U... 21 And U 22 Set the target voltage value U2 for the load and designate the load model as PV-PQ type. Perform power flow calculation based on U2 to obtain the first power flow result. According to the first power flow result, output the generator terminal voltage and the over-limit bus with the set target voltage level. For new energy generator terminal buses with generator terminal voltages exceeding the lower limit, adjust the corresponding SVG load target voltage to U2.22 For new energy generator terminal buses where the terminal voltage exceeds the upper limit, the corresponding SVG load target voltage will be adjusted to U. 21 The system performs power flow calculations to obtain the second power flow result. Based on the second power flow result, it outputs the over-limit bus voltage and the set target voltage level. For new energy generator terminal buses that over-limit again, the system calculates the current reactive power value and Q. max and Q min The difference is used to calculate whether there is adjustable space; if the voltage at the new energy generator terminal falls below the lower limit, the Q of the SVG load... up =0, no adjustable space, find two levels of topology outward from the current station, and adjust the target value of the SVG load of the found neighboring stations to U. 22 If the voltage at the new energy generator terminal exceeds the upper limit, the target value of the SVG load at the nearest station will be found and adjusted to U. 21 Then, power flow calculation is performed. After the power flow calculation is completed, the third power flow result is obtained, and the load model is changed to the PQ model.

[0097] The adjustment unit 203 is used to output the series compensation and parallel compensation of the substations with over-limit buses in the third power flow result, and to automatically add capacitors or remove reactors for substations with voltages below the lower limit according to the difference between the voltage and the limit voltage, and to automatically remove capacitors or add reactors for substations with voltages above the upper limit according to the difference between the voltage and the limit voltage.

[0098] Optional, U 21 The calculation formula is as follows:

[0099]

[0100] Among them, U 21 U is the lower limit of the SVG load adjustment target. 11 As the lower limit of the target voltage adjustment at the generator terminals, P1, R T Q1, X T Both P1 and k are variables connecting the transformer between the new energy generator and the SVG load, where P1 is the active power on the low-voltage side of the transformer, and R is the active power on the low-voltage side. T The main transformer's resistance, Q1 is the reactive power on the low-voltage side of the transformer, X T The reactance of the main transformer is k, and the turns ratio of the main transformer is k.

[0101] Optional, U 22 The calculation formula is as follows:

[0102]

[0103] Among them, U 22 Adjust the target upper limit for SVG load, U 12 To adjust the target upper limit of the terminal voltage, P1, R TQ1, X T Both P1 and k are variables connecting the transformer between the new energy generator and the SVG load, where P1 is the active power on the low-voltage side of the transformer, and R is the active power on the low-voltage side. T The main transformer's resistance, Q1 is the reactive power on the low-voltage side of the transformer, X T The reactance of the main transformer is k, and the turns ratio of the main transformer is k.

[0104] Optionally, the formula for calculating U2 is as follows:

[0105]

[0106] Where U2 is the target voltage value of the SVG load, U 21 Adjust the target upper limit for SVG load, U 22 Adjust the target lower limit for SVG load.

[0107] Optional, adjustable space upward adjustment space Q up =Q max -Q, lowering the space Q down =QQ min ;

[0108] Among them, Q up Q provides room for reactive power adjustment. max Q is the upper limit of reactive power, and Q is the current reactive power value. down Q provides room for reactive power reduction. min This is the lower limit value for reactive power.

[0109] This invention can automatically mobilize surrounding reactive power resources to coordinate and adjust the voltage at the new energy generator terminals when the voltage cannot be adjusted, and can automatically switch series and parallel to adjust the voltage of high voltage levels to the target level.

[0110] Example 3:

[0111] Based on the same inventive concept, this invention also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement corresponding method flows or corresponding functions, thereby implementing the steps of the methods in the above embodiments.

[0112] Example 4:

[0113] Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiments.

[0114] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0115] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0116] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0117] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0118] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0119] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A voltage automatic adjustment method suitable for different new energy simultaneous rate power grid operation mode, characterized in that, The third power flow result includes: According to the actual position of the SVG in the power system, a load model is established on a bus to which the SVG is connected, and according to a reactive power adjustment range of the SVG, an upper limit Q of reactive power of the load model is set max and a lower limit Q of reactive power min of the load model are set. According to the target range of the terminal voltage of the new energy unit in the power system, the load adjustment target value U of the SVG is calculated 21 and U 22 ; the voltage target value of the load is set according to the U 21 and U 22 ​ After adjusting new energy output and power balance, according to the U 21 And U 22 The voltage target value U2 of the load is set, the load is modeled as a PV-PQ type, power flow calculation is performed based on the U2, and a first power flow result is obtained. According to the first power flow result, the terminal voltage of the generator and the over-limit bus output of the voltage target voltage level are output, for the new energy terminal bus of the lower limit of the terminal voltage of the generator, the corresponding SVG load target voltage is adjusted to U 22 , for the new energy terminal bus of the upper limit of the terminal voltage of the generator, the corresponding SVG load target voltage is adjusted to U 21 , and the power flow calculation is performed to obtain the second power flow result. According to the second tidal current result, the machine terminal voltage and the out-of-limit bus output of setting the voltage target voltage level, for the new energy machine terminal bus which exceeds the machine terminal voltage again, according to the difference between the current reactive power value and Q max and Q min , whether there is adjustable space is calculated; If the new energy terminal voltage is lower than the lower limit, the SVG load Q up =0, which has no adjustable space, and the current station is searched for two-level topology, and the target value of the SVG load of the adjacent station found is adjusted to U 22 , if the new energy terminal voltage is higher than the upper limit, the target value of the SVG load of the adjacent station found is adjusted to U 21 , and then the power flow calculation is performed, after the power flow calculation is completed, the third power flow result is obtained, and the load model is changed to a PQ model. In the third power flow result, the series compensation and shunt compensation output of the substation with the over-limit bus is adjusted, the substation with the voltage lower than the lower limit automatically inputs the capacitor or exits the reactor according to the difference between the voltage and the limit voltage, and the substation with the voltage higher than the upper limit automatically exits the capacitor or inputs the reactor according to the difference between the voltage and the limit voltage.

2. The grid operating mode voltage automatic adjustment method of claim 1, wherein, The U 21 The calculation formula is as follows: Wherein, U 21 is the SVG load adjustment target lower limit, U 11 is the machine terminal voltage adjustment target lower limit, P1, R T , Q1, X T , k are all variables connected between the new energy machine terminal and the SVG load, wherein P1 is the active power on the low voltage side of the transformer, R T is the resistance of the main transformer, Q1 is the reactive power on the low voltage side of the transformer, X T is the reactance of the main transformer, and k is the transformation ratio of the main transformer.

3. The method of claim 1, wherein, The U 22 The calculation formula is as follows: Wherein, U 22 is the SVG load adjustment target upper limit, U 12 is the machine terminal voltage adjustment target upper limit, P1, R T , Q1, X T , and k are variables connected between the transformer of the new energy machine terminal and the SVG load, wherein P1 is the active power on the low voltage side of the transformer, R T is the resistance of the main transformer, Q1 is the reactive power on the low voltage side of the transformer, X T is the reactance of the main transformer, and k is the transformation ratio of the main transformer.

4. The method of claim 1, wherein, The calculation formula of U2 is as follows: Wherein, U2 is the voltage target value of the SVG load, U 21 is the SVG load adjustment target upper limit value, U 22 is the SVG load adjustment target lower limit value.

5. The method of claim 1, wherein, the up-regulated space Q of the adjustable space up = Q max - Q, the down-regulated space Q of the adjustable space down = Q - Q min ; where Q up is the reactive up regulation space, Q max is the reactive upper limit value, Q is the current reactive value, Q down is the reactive down regulation space, Q min is the reactive lower limit value.

6. A voltage automatic adjustment system for power grid operation mode suitable for different new energy simultaneous rates, characterized in that, The third power flow result includes: An initial unit is configured to establish a load model on a bus to which the SVG is connected according to an actual position of the SVG in a power system, and set an upper limit Q of reactive power of the load model according to a reactive power adjustment range of the SVG max and a lower limit Q of reactive power min , calculate a load adjustment target value U of the SVG according to a target range of a terminal voltage of a new energy unit in the power system 21 and U 22 , set a voltage target value of the load according to the U 21 and U 22 ​ The power flow calculation unit is used to adjust the output of new energy sources and achieve power balance, based on the U... 21 And U 22 Set the target voltage value U2 for the load and designate the load model as PV-PQ type. Perform power flow calculation based on U2 to obtain the first power flow result. According to the first power flow result, output the generator terminal voltage and the over-limit bus with the set target voltage level. For new energy generator terminal buses with generator terminal voltages exceeding the lower limit, adjust the corresponding SVG load target voltage to U2. 22 For new energy generator terminal buses where the terminal voltage exceeds the upper limit, the corresponding SVG load target voltage will be adjusted to U. 21 The system performs power flow calculations to obtain the second power flow result. Based on the second power flow result, it outputs the over-limit bus voltage and the set target voltage level. For new energy generator terminal buses that over-limit again, the system calculates the current reactive power value and Q. max and Q min The difference is used to calculate whether there is adjustable space; if the voltage at the new energy generator terminal falls below the lower limit, the Q of the SVG load... up =0, no adjustable space, find two levels of topology outward from the current station, and adjust the target value of the SVG load of the found neighboring stations to U. 22 If the voltage at the new energy generator terminal exceeds the upper limit, the target value of the SVG load at the nearest station will be found and adjusted to U. 21 Then, power flow calculation is performed. After the power flow calculation is completed, the third power flow result is obtained, and the load model is changed to the PQ model. The adjusting unit is used for adjusting the series compensation and shunt compensation output of the substation with the over-limit bus in the third power flow result, automatically inputting the capacitor or exiting the reactor for the substation with the voltage lower than the lower limit according to the difference between the voltage and the limit voltage, and automatically exiting the capacitor or inputting the reactor for the substation with the voltage higher than the upper limit according to the difference between the voltage and the limit voltage.

7. The grid operating mode voltage automatic adjustment system of claim 6, wherein, The U 21 The calculation formula is as follows: Wherein, U 21 is the SVG load adjustment target lower limit, U 11 is the machine terminal voltage adjustment target lower limit, P1, R T , Q1, X T , k are all variables connected between the transformer of the new energy machine terminal and the SVG load, wherein P1 is the active power on the low voltage side of the transformer, R T is the resistance of the main transformer, Q1 is the reactive power on the low voltage side of the transformer, X T is the reactance of the main transformer, and k is the transformation ratio of the main transformer.

8. The grid operating mode voltage automatic adjustment system of claim 6, wherein, The U 22 The calculation formula is as follows: Wherein, U 22 is the SVG load adjustment target upper limit, U 12 is the machine terminal voltage adjustment target upper limit, P1, R T , Q1, X T , and k are variables connected between the transformer of the new energy machine terminal and the SVG load, wherein P1 is the active power on the low voltage side of the transformer, R T is the resistance of the main transformer, Q1 is the reactive power on the low voltage side of the transformer, X T is the reactance of the main transformer, and k is the transformation ratio of the main transformer.

9. The grid operating mode voltage automatic adjustment system of claim 6, wherein, The calculation formula of U2 is as follows: Wherein, U2 is the voltage target value of the SVG load, U 21 is the SVG load adjustment target upper limit value, U 22 is the SVG load adjustment target lower limit value.

10. The grid operating mode voltage automatic adjustment system of claim 6, wherein, The up-regulation space Q of the adjustable space up = Q max The down-regulation space Q of the adjustable space down = Q - Q min ; where Q up is the reactive up regulation space, Q max is the reactive upper limit value, Q is the current reactive value, Q down is the reactive down regulation space, Q min is the reactive lower limit value.

11. A computer device, comprising: The third power flow result includes: One or more processors; A processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method as claimed in any one of claims 1-5 is implemented.

12. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed, the method as claimed in any one of claims 1-5 is implemented.

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