Self-adaptive voltage regulation method, device and equipment for distribution network area and storage medium

Abstract

The invention relates to the technical field of power distribution network area voltage treatment, in particular to a power distribution network area self-adaptive voltage regulation method, device and equipment and a storage medium. The method comprises the steps that firstly, the voltage deviation degree of a common connection point of the low-voltage side of an area transformer is obtained; according to the reactive power-voltage sensitivity and the voltage deviation degree, the reactive power variable quantity required by voltage regulation is calculated; when the voltage exceeds the limit, according to the reactive power variable quantity, the reactive power variable quantity margin of the photovoltaic inverter, the reactive power variable quantity margin of the SVG, the reactive power variable quantity margin of the capacitor bank and the response speed of each reactive power source, the reactive power output of the photovoltaic inverter, the reactive power output of the SVG and the reactive power output of the capacitor bank are sequentially adjusted; and finally, when voltage treatment is qualified, a continuous dynamic reactive power optimization control strategy is adopted, and reactive power distribution is optimized. According to the grid-connected point voltage deviation degree and the operation state of the multi-reactive-power-source equipment, reactive power distribution is adjusted in real time, and voltage out-of-limit is restrained.

Description

Technical Field

[0001] The present invention relates to the technical field of distributed photovoltaic grid-connected and distribution network area voltage management, and in particular to a distribution network area adaptive voltage regulation method, device, equipment and storage medium. Background Art

[0002] With the increasing prominence of climate warming and energy crisis, renewable energy has become a development trend. With the continuous advancement of global energy transformation, the penetration rate of distributed photovoltaic power generation in distribution network areas is increasing.

[0003] High-proportion photovoltaic access has brought significant environmental and economic benefits to the power system, but it has also posed severe challenges to the power quality and voltage stability of the distribution network. The randomness and intermittency of photovoltaic power generation lead to frequent voltage fluctuations, especially during low-load periods and under high light intensity, when the voltage rise phenomenon is more significant. In addition, the uneven distribution of photovoltaic access points may cause three-phase imbalance problems, which not only affects the stable operation of the power system, but also causes potential damage to sensitive electrical equipment.

[0004] Traditional voltage regulation methods, such as voltage regulators and reactive power compensation devices, often have difficulty responding to voltage fluctuations caused by photovoltaic power generation in real time, and the regulation range is limited, which cannot meet the higher requirements for voltage quality in the context of high-proportion photovoltaic access. In response to these problems, there is an urgent need for an adaptive voltage regulation method and device that can sense the voltage changes in the distribution network substation in real time, and coordinately control the reactive power output of photovoltaic inverters, static dynamic reactive power compensation devices (SVG), capacitor banks and other equipment, adaptively adjust the voltage level, and ensure the voltage stability of the distribution network substation under various operating conditions.

[0005] Based on this, it is necessary to develop and design an adaptive voltage regulation method for distribution network substations. Summary of the invention

[0006] The embodiments of the present invention provide a method, device, equipment and storage medium for adaptive voltage regulation in a distribution network area, which are used to solve the problem in the prior art that it is difficult to respond in real time to voltage fluctuations caused by photovoltaic power generation.

[0007] In a first aspect, an embodiment of the present invention provides a method for adaptively regulating voltage in a distribution network area, comprising:

[0008] Obtain the voltage deviation degree of the common connection point on the low-voltage side of the transformer in the substation;

[0009] Calculating the reactive power change required for voltage regulation according to the reactive power-voltage sensitivity and the voltage deviation degree;

[0010] When the voltage exceeds the limit, the reactive output of the photovoltaic inverter, the reactive output of the SVG and the reactive output of the capacitor bank are adjusted in sequence according to the reactive power variation, the reactive variation margin of the photovoltaic inverter, the reactive variation margin of the SVG, the reactive variation margin of the capacitor bank and the response speed of each reactive source;

[0011] When the voltage management is qualified, the continuous dynamic reactive power optimization control strategy is adopted to optimize the reactive power distribution.

[0012] In a possible implementation, the calculating the reactive power change required for voltage regulation according to the reactive power-voltage sensitivity and the voltage deviation degree includes:

[0013] The reactive power change required for voltage regulation is calculated according to the first formula, the reactive power-voltage sensitivity and the voltage deviation degree, wherein the first formula is:

[0014]

[0015] In the formula, ΔQ is the reactive power change, k is the reactive power-voltage sensitivity coefficient, ΔU is the voltage deviation, Q 2 is the reactive power output at the second time node, Q 1 is the reactive power output at the first time node, U 2 is the grid connection point voltage at the second time node, U 1 is the grid connection point voltage at the first time node.

[0016] In a possible implementation, when the voltage exceeds the limit, the reactive output of the photovoltaic inverter, the reactive output of the SVG, and the reactive output of the capacitor bank are adjusted according to the reactive power variation, the reactive variation margin of the photovoltaic inverter, the reactive variation margin of the SVG, the reactive variation margin of the capacitor bank, and the response speed of each reactive source, including:

[0017] Calculating the reactive power variation margin of the photovoltaic inverter, the reactive power variation margin of the SVG, and the reactive power variation margin of the capacitor bank;

[0018] If the reactive power variation is less than or equal to the sum of the reactive power variation margin of the photovoltaic inverter and the reactive power variation margin of the SVG, adjusting the reactive output of the photovoltaic inverter and the reactive output of the SVG;

[0019] Otherwise, the reactive output of the photovoltaic inverter and the reactive output of the SVG are adjusted first, and then the reactive output of the capacitor bank is adjusted.

[0020] In a possible implementation, the calculating the reactive power variation margin of the photovoltaic inverter, the reactive power variation margin of the SVG, and the reactive power variation margin of the capacitor bank includes:

[0021] The reactive power variation margin of the photovoltaic inverter is calculated according to a second formula, wherein the second formula is:

[0022]

[0023] Where ΔQ pv is the total reactive power regulation margin of the photovoltaic inverter, Q pv,i is the real-time reactive power of the ith photovoltaic inverter, Q pv_max,i and Q pv_min,i are the upper and lower limits of the reactive power adjustment of the i-th photovoltaic inverter, m is the number of photovoltaic inverters, U pcc is the voltage of the common connection point on the low voltage side of the transformer in the substation, U N is the rated voltage;

[0024] The SVG reactive power variation margin is calculated according to a third formula, wherein the third formula is:

[0025]

[0026] Where ΔQ SVG is the total reactive power regulation margin of SVG, Q SVG,i is the real-time reactive power of the i-th SVG, Q SVG_max,i and Q SVG_min,i are the upper and lower limits of reactive power adjustment of the i-th SVG, respectively, and n is the number of SVGs;

[0027] The reactive power variation margin of the capacitor bank is calculated according to a fourth formula, wherein the fourth formula is:

[0028]

[0029] Where ΔQ C is the total reactive power regulation margin of the capacitor bank, Q C,i is the real-time reactive power of the i-th capacitor bank, Q C_max,i and Q C_min,i are the upper and lower limits of the reactive power adjustment of the i-th capacitor bank, respectively, and l is the number of capacitor banks.

[0030] In a possible implementation, the adjusting the reactive output of the photovoltaic inverter and the reactive output of the SVG includes:

[0031] If the reactive power variation margin of the photovoltaic inverter is greater than or equal to the reactive power variation, only the reactive power output of the photovoltaic inverter is adjusted;

[0032] Determine whether the first inequality holds, wherein the first inequality is:

[0033] ΔQ≤ΔQ pv +μΔQ SVG

[0034] In the formula, ΔQ is the change in reactive power, ΔQ pv is the total reactive power regulation margin of the photovoltaic inverter, μ is the first coefficient, ΔQ SVG It is the total reactive power regulation margin of SVG;

[0035] If the first inequality holds, the reactive output of the photovoltaic inverter is adjusted according to the total reactive power regulation margin of the photovoltaic inverter, and the reactive output of the SVG is adjusted according to the difference between the reactive power change and the total reactive power regulation margin of the SVG.

[0036] In a possible implementation, the continuous dynamic reactive power optimization control strategy is adopted to optimize reactive power distribution, including:

[0037] If the total reactive power regulation margin of the capacitor bank is greater than the reactive power variation, only the reactive power output of the capacitor bank is adjusted;

[0038] If the sum of the total reactive power regulation margin of the capacitor bank and the total reactive power regulation margin of the photovoltaic inverter is greater than or equal to the reactive power variation, only the reactive output of the capacitor bank and the reactive output of the photovoltaic inverter are adjusted;

[0039] If the sum of the total reactive power regulation margin of the capacitor group and the total reactive power regulation margin of the photovoltaic inverter is less than the reactive power change, the capacitor group adjusts the reactive output according to the total reactive power regulation margin of the capacitor group, the photovoltaic inverter adjusts the reactive output according to the total reactive power regulation margin of the photovoltaic inverter, and the SVG adjusts the reactive output according to the reactive under-regulation part.

[0040] In a possible implementation, the reactive power of the photovoltaic inverter, the SVG, and the capacitor bank is distributed according to a fifth formula, wherein the fifth formula is:

[0041]

[0042] In the formula, Q pv_out,i , Q SVG_out,i and Q SVG_out,i are the reactive output regulation of the i-th photovoltaic inverter, the i-th SVG and the i-th capacitor bank, ΔQ pv,i , ΔQ SVG.i and ΔQ C,iare the reactive power regulation margins of the ith PV inverter, the ith SVG, and the ith capacitor bank, Q pv_out , Q SVG_out and Q C_out are the total reactive output regulation of the PV inverter, SVG and capacitor bank, respectively; m, n and l are the number of devices of the PV inverter, SVG and capacitor bank, respectively.

[0043] In a second aspect, an embodiment of the present invention provides a distribution network area adaptive voltage regulation device, which is used to implement the distribution network area adaptive voltage regulation method as described in the first aspect or any possible implementation of the first aspect, and the distribution network area adaptive voltage regulation device includes:

[0044] A voltage deviation acquisition module is used to obtain the voltage deviation degree of the common connection point on the low-voltage side of the transformer in the substation;

[0045] A reactive power calculation module, used to calculate the reactive power change required for voltage regulation according to the reactive power-voltage sensitivity and the voltage deviation degree;

[0046] A first voltage management module is used to adjust the reactive output of the photovoltaic inverter, the reactive output of the SVG and the reactive output of the capacitor bank in sequence according to the reactive power variation, the reactive variation margin of the photovoltaic inverter, the reactive variation margin of the SVG, the reactive variation margin of the capacitor bank and the response speed of each reactive source when the voltage exceeds the limit;

[0047] as well as,

[0048] The second voltage management module is used to optimize reactive power distribution by adopting a continuous dynamic reactive power optimization control strategy when the voltage management is qualified.

[0049] In a third aspect, an embodiment of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, it implements the steps of the method described in the first aspect or any possible implementation method of the first aspect.

[0050] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in the first aspect or any possible implementation of the first aspect are implemented.

[0051] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0052] The embodiment of the present invention discloses a method for adaptive voltage regulation in a distribution network substation, which first obtains the voltage deviation degree of the common connection point on the low-voltage side of the substation transformer; then calculates the reactive power change required for voltage regulation according to the reactive-voltage sensitivity and the voltage deviation degree; then, when the voltage exceeds the limit, according to the reactive power change, the reactive change margin of the photovoltaic inverter, the reactive change margin of the SVG, the reactive change margin of the capacitor group and the response speed of each reactive source, the reactive output of the photovoltaic inverter, the reactive output of the SVG and the reactive output of the capacitor group are adjusted in sequence; finally, when the voltage management is qualified, a continuous dynamic reactive optimization control strategy is adopted to optimize the reactive power distribution. The embodiment of the present invention can optimize and adjust the reactive power distribution in real time according to the voltage deviation degree of the grid connection point and the operating status of multiple reactive source equipment, realize the effective suppression of voltage exceeding the limit, ensure the safe and stable operation of the distribution network substation, and improve the power quality at the same time, providing technical support for the sustainable development of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0054] Figure 1 It is a flow chart of a method for adaptive voltage regulation in a distribution network area provided by an embodiment of the present invention;

[0055] Figure 2 It is a topological diagram of a distribution network area with a high proportion of photovoltaic access provided by an embodiment of the present invention;

[0056] Figure 3 It is a block diagram of a continuous dynamic reactive power optimization control strategy provided by an embodiment of the present invention;

[0057] Figure 4 It is a block diagram of a multi-source coordinated voltage control strategy provided by an embodiment of the present invention;

[0058] Figure 5 It is a functional block diagram of a distribution network area adaptive voltage regulation device provided by an embodiment of the present invention;

[0059] Figure 6 It is a functional block diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0060] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, and methods are omitted so as not to obscure the description of the present invention with unnecessary details.

[0061] In order to make the purpose, technical solutions and advantages of the present invention more clear, a specific implementation method will be described below in conjunction with the accompanying drawings.

[0062] The following is a detailed description of an embodiment of the present invention. This example is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0063] Figure 1 A flow chart of a method for adaptive voltage regulation in a distribution network area provided in an embodiment of the present invention.

[0064] like Figure 1 As shown, it shows a flow chart of the implementation of the distribution network area adaptive voltage regulation method provided by the embodiment of the present invention, which is described in detail as follows:

[0065] In step 101, the voltage deviation degree of the common connection point on the low voltage side of the transformer in the substation is obtained.

[0066] In step 102, the reactive power variation required for voltage regulation is calculated according to the reactive power-voltage sensitivity and the voltage deviation degree.

[0067] In some implementations, step 102 includes:

[0068] The reactive power change required for voltage regulation is calculated according to the first formula, the reactive power-voltage sensitivity and the voltage deviation degree, wherein the first formula is:

[0069]

[0070] In the formula, ΔQ is the reactive power change, k is the reactive power-voltage sensitivity coefficient, ΔU is the voltage deviation, Q 2 is the reactive power output at the second time node, Q 1 is the reactive power output at the first time node, U 2 is the grid connection point voltage at the second time node, U 1 is the grid connection point voltage at the first time node.

[0071] Exemplarily, the embodiment of the present invention provides an adaptive voltage regulation method based on multiple reactive source devices to address the problem of voltage exceeding the limit in a distribution network area with a high proportion of distributed photovoltaic access.

[0072] In the implementation mode of the present invention, the voltage deviation degree is calculated using the PCC three-phase voltage data collected by the electric meter. The reactive power change required for voltage regulation is calculated based on the voltage deviation degree. When the voltage at the PCC point exceeds the upper and lower voltage limits, a multi-source coordinated voltage control strategy is adopted to adaptively allocate reactive power based on the reactive source response time; after the voltage management is qualified, a continuous dynamic reactive power optimization control strategy is adopted to optimize reactive power distribution and provide reactive power support for the distribution network station area in a continuous and dynamic manner.

[0073] The adaptive voltage regulation method for distribution network substations taking into account a high proportion of distributed photovoltaic access proposed in the present invention has simple criteria and requires a small amount of data, which can effectively improve the voltage management capability of the distribution network substations and enhance the safety and stability of the power system.

[0074] like Figure 2 As shown, an embodiment of the present invention provides an application scenario diagram of a method for adaptively adjusting voltage in a distribution network area. The distribution network area topology based on this method includes: distributed photovoltaic inverters, SVG, capacitor banks and other adjustable resources.

[0075] The method provided in the embodiment of the present invention comprises the following steps:

[0076] S1: First, collect the voltage data U of the common connection point on the low-voltage side of the transformer in the substation in real time PCC .

[0077] S2: If U PCC If it is in the voltage regulation dead zone, then go to step S1; otherwise, go to step S3;

[0078] S3: According to U PCC and rated voltage U N Calculate the voltage deviation degree ΔU, the calculation formula is as follows

[0079] ΔU=|U PCC -U N |

[0080] If ΔU does not exceed the voltage limit, go to step S8; if ΔU exceeds the voltage limit, go to step S4;

[0081] S4: Calculate the reactive power change required to adjust the voltage based on ΔU. The calculation formula is as follows:

[0082] ΔQ=kΔU

[0083] Where k is the reactive power-voltage sensitivity coefficient (droop control coefficient).

[0084] The k value is adjusted as follows: 1 When the voltage at the grid connection point is U 1 , the reactive power output is Q 1 ;t 2 (t 2 >t 1 ), the voltage at the grid connection point is U 2 , the reactive power output is Q 2 , where the relationship between voltage and reactive power must satisfy (Q 2 -Q 1 )(U 2 -U 1 )>0. When a small time span from t 1 to 2 , the relationship between voltage and reactive power is approximately linear. At this time, the reactive-voltage sensitivity coefficient k can be obtained as:

[0085]

[0086] WhenU PCC >U N , the equipment needs to reduce reactive power output ΔQ, when U PCC N , the equipment needs to increase its reactive output ΔQ.

[0087] In step 103, when the voltage exceeds the limit, the reactive output of the photovoltaic inverter, the reactive output of the SVG and the reactive output of the capacitor group are adjusted in sequence according to the reactive power change, the reactive change margin of the photovoltaic inverter, the reactive change margin of the SVG, the reactive change margin of the capacitor group and the response speed of each reactive source.

[0088] In some implementations, step 103 includes:

[0089] Calculating the reactive power variation margin of the photovoltaic inverter, the reactive power variation margin of the SVG, and the reactive power variation margin of the capacitor bank;

[0090] If the reactive power variation is less than or equal to the sum of the reactive power variation margin of the photovoltaic inverter and the reactive power variation margin of the SVG, adjusting the reactive output of the photovoltaic inverter and the reactive output of the SVG;

[0091] Otherwise, the reactive output of the photovoltaic inverter and the reactive output of the SVG are adjusted first, and then the reactive output of the capacitor bank is adjusted.

[0092] In some implementations, the calculating the reactive power variation margin of the photovoltaic inverter, the reactive power variation margin of the SVG, and the reactive power variation margin of the capacitor bank includes:​

[0093] The reactive power variation margin of the photovoltaic inverter is calculated according to a second formula, wherein the second formula is:

[0094]

[0095] Where ΔQ pv is the total reactive power regulation margin of the photovoltaic inverter, Q pv,i is the real-time reactive power of the ith photovoltaic inverter, Q pv_max,i and Q pv_min,i are the upper and lower limits of the reactive power adjustment of the i-th photovoltaic inverter, m is the number of photovoltaic inverters, U pcc is the voltage of the common connection point on the low voltage side of the transformer in the substation, U N is the rated voltage;

[0096] The SVG reactive power variation margin is calculated according to a third formula, wherein the third formula is:

[0097]

[0098] Where ΔQ SVG is the total reactive power regulation margin of SVG, Q SVG,i is the real-time reactive power of the i-th SVG, Q SVG_max,i and Q SVG_min,i are the upper and lower limits of reactive power adjustment of the i-th SVG, respectively, and n is the number of SVGs;

[0099] The reactive power variation margin of the capacitor bank is calculated according to a fourth formula, wherein the fourth formula is:

[0100]

[0101] Where ΔQ C is the total reactive power regulation margin of the capacitor bank, Q C,i is the real-time reactive power of the i-th capacitor bank, Q C_max,i and Q C_min,i are the upper and lower limits of the reactive power adjustment of the i-th capacitor bank, respectively, and l is the number of capacitor banks.

[0102] In some implementations, adjusting the reactive output of the photovoltaic inverter and the reactive output of the SVG includes:

[0103] If the reactive power variation margin of the photovoltaic inverter is greater than or equal to the reactive power variation, only the reactive power output of the photovoltaic inverter is adjusted;

[0104] Determine whether the first inequality holds, wherein the first inequality is:

[0105] ΔQ≤ΔQ pv +μΔQ SVG

[0106] In the formula, ΔQ is the change in reactive power, ΔQ pv is the total reactive power regulation margin of the photovoltaic inverter, μ is the first coefficient, ΔQ SVG It is the total reactive power regulation margin of SVG;

[0107] If the first inequality holds, the reactive output of the photovoltaic inverter is adjusted according to the total reactive power regulation margin of the photovoltaic inverter, and the reactive output of the SVG is adjusted according to the difference between the reactive power change and the total reactive power regulation margin of the SVG.

[0108] In some embodiments, the reactive power of the photovoltaic inverter, the SVG, and the capacitor bank is distributed according to a fifth formula, wherein the fifth formula is:

[0109]

[0110] In the formula, Q pv_out,i , Q SVG_out,i and Q SVG_out,i are the reactive output regulation of the i-th photovoltaic inverter, the i-th SVG and the i-th capacitor bank, ΔQ pv,i , ΔQ SVG.i and ΔQ C,i are the reactive power regulation margins of the ith PV inverter, the ith SVG, and the ith capacitor bank, Q pv_out , Q SVG_out and Q C_out are the total reactive output regulation of the PV inverter, SVG and capacitor bank, respectively; m, n and l are the number of devices of the PV inverter, SVG and capacitor bank, respectively.

[0111] Exemplarily, in an embodiment of the present invention, adjustment is performed according to the margin of the device:

[0112] S5: Calculate the reactive power variation margin of the photovoltaic inverter participating in the reactive power voltage regulation response. The calculation formula is as follows:

[0113]

[0114] Where ΔQ pv is the total reactive power regulation margin of the photovoltaic inverter, Q pv,i is the real-time reactive power of the ith photovoltaic inverter, Q pv_max,i and Q pv_min,i are the upper and lower limits of the reactive power adjustment of the i-th photovoltaic inverter, m is the number of photovoltaic inverters, U pccis the voltage of the common connection point on the low voltage side of the transformer in the substation, U N is the rated voltage;

[0115] Calculate the reactive power variation margin of SVG participating in reactive power voltage regulation response, the calculation formula is as follows:

[0116]

[0117] Where ΔQ SVG is the total reactive power regulation margin of SVG, Q SVG,i is the real-time reactive power of the i-th SVG, Q SVG_max,i and Q SVG_min,i are the upper and lower limits of reactive power adjustment of the i-th SVG, respectively, and n is the number of SVGs;

[0118] Calculate the reactive power variation margin of the capacitor bank participating in the reactive power voltage regulation response. The calculation formula is as follows:

[0119]

[0120] Where ΔQ C is the total reactive power regulation margin of the capacitor bank, Q C,i is the real-time reactive power of the i-th capacitor bank, Q C_max,i and Q C_min,i are the upper and lower limits of the reactive power adjustment of the i-th capacitor bank, respectively, and l is the number of capacitor banks.

[0121] S6: If ΔQ ≤ ΔQ pv +μΔQ SVG At this time, you only need to adjust the dynamic reactive power compensation, that is, adjust the reactive power of the PV inverter and SVG. At this time, make the following judgments based on the reactive power adjustment margin of the PV inverter and SVG:

[0122] (1) If the total reactive power regulation margin of the PV inverter ΔQ pv >ΔQ, it is only necessary to adjust the reactive power output of the PV inverter, that is, the total reactive power regulation change of the PV inverter is ΔQ.

[0123] (2) If the total reactive power regulation margin of the PV inverter ΔQ pv <ΔQ, then it is necessary to jointly adjust the reactive power output of the PV inverter and SVG, and make the following judgments:

[0124] 1) If ΔQ ≤ ΔQ pv +μΔQ SVG (In order to reserve the reactive power margin of SVG for the next voltage regulation, the reactive power margin adjustment coefficient of SVG is set to a positive number greater than 0 and less than 1). The reactive power change of the photovoltaic inverter is ΔQ-μΔQ SVG , the reactive power change of SVG is μΔQSVG .

[0125] 2) If ΔQ>ΔQ pv +μΔQ SVG , then the reactive power change of the photovoltaic inverter is ΔQ pv , the reactive power change of SVG is ΔQ-ΔQ pv .

[0126] S7: If ΔQ>ΔQ pv +μΔQ SVG , it is necessary to adjust the dynamic reactive power and static reactive power compensation at the same time, first adjust the photovoltaic inverter and SVG, and then the under-adjustment part will be borne by the capacitor bank.

[0127] The detailed method is:

[0128] If ΔQ>ΔQ pv +μΔQ SVG At this time, it is necessary to adjust the dynamic reactive power compensation and static reactive power compensation, that is, adjust the reactive power of the photovoltaic inverter, SVG and capacitor bank. At this time, the reactive power distribution method is: the reactive power output of the photovoltaic inverter is adjusted to ΔQ pv , the reactive output regulation of SVG is ΔQ SVG , the reactive output of the capacitor bank is regulated to ΔQ-ΔQ pv -μΔQ SVG .

[0129] Furthermore, the reactive power allocation method for the photovoltaic inverter, SVG, and capacitor bank in steps S6 and S7 can be allocated according to the reactive power margin of each device, and the calculation formula is as follows:

[0130]

[0131] In the formula, Q pv_out,i , Q SVG_out,i and Q SVG_out,i are the reactive output regulation of the i-th photovoltaic inverter, the i-th SVG and the i-th capacitor bank, ΔQ pv,i , ΔQ SVG.i and ΔQ C,i are the reactive power regulation margins of the ith PV inverter, the ith SVG, and the ith capacitor bank, Q pv_out , Q SVG_out and Q C_out are the total reactive output regulation of the PV inverter, SVG and capacitor bank, respectively; m, n and l are the number of devices of the PV inverter, SVG and capacitor bank, respectively.

[0132] In step 104, when the voltage management is qualified, a continuous dynamic reactive power optimization control strategy is adopted to optimize reactive power distribution.

[0133] In some implementations, step 104 includes:

[0134] If the total reactive power regulation margin of the capacitor bank is greater than the reactive power variation, only the reactive power output of the capacitor bank is adjusted;

[0135] If the sum of the total reactive power regulation margin of the capacitor bank and the total reactive power regulation margin of the photovoltaic inverter is greater than or equal to the reactive power variation, only the reactive output of the capacitor bank and the reactive output of the photovoltaic inverter are adjusted;

[0136] If the sum of the total reactive power regulation margin of the capacitor group and the total reactive power regulation margin of the photovoltaic inverter is less than the reactive power change, the capacitor group adjusts the reactive output according to the total reactive power regulation margin of the capacitor group, the photovoltaic inverter adjusts the reactive output according to the total reactive power regulation margin of the photovoltaic inverter, and the SVG adjusts the reactive output according to the reactive under-regulation part.

[0137] For example, S8: If U PCC Restore to the normal voltage range, that is, U min ≤U PCC ≤U max , using continuous dynamic reactive power optimization control strategy. First, put the capacitor into operation, then adjust the reactive power of photovoltaic inverter and SVG.

[0138] The detailed steps are:

[0139] (1) If the reactive power adjustable margin of the capacitor bank ΔQ C ≥ΔQ, then it is only necessary to adjust the reactive output of the capacitor bank to ΔQ.

[0140] (2) If the reactive power adjustable margin of the capacitor bank ΔQ C <ΔQ, there are two cases to discuss:

[0141] 1) If the sum of the reactive power adjustable margins of the capacitor bank and the PV inverter ΔQ pv +ΔQ C ≥ΔQ, then only the reactive power of the capacitor bank and the photovoltaic inverter needs to be adjusted, and the reactive power output of the capacitor is adjusted to ΔQ C , the reactive output of the photovoltaic inverter is ΔQ-ΔQ C .

[0142] 2) If the sum of the reactive power adjustable margins of the capacitor bank and the PV inverter ΔQ pv +ΔQ C <ΔQ, then the reactive under-regulation part is borne by SVG, and the reactive output of the capacitor bank is regulated to ΔQ C , the reactive output of the photovoltaic inverter is ΔQ pv, the reactive output regulation of SVG is ΔQ-ΔQ pv -ΔQ C . .

[0143] The adaptive voltage regulation method implementation method of the distribution network substation of the present invention first obtains the voltage deviation degree of the common connection point on the low-voltage side of the substation transformer; then calculates the reactive power change required for voltage regulation according to the reactive-voltage sensitivity and the voltage deviation degree; then, when the voltage exceeds the limit, according to the reactive power change, the reactive change margin of the photovoltaic inverter, the reactive change margin of the SVG, the reactive change margin of the capacitor group and the response speed of each reactive source, the reactive output of the photovoltaic inverter, the reactive output of the SVG and the reactive output of the capacitor group are adjusted in sequence; finally, when the voltage management is qualified, a continuous dynamic reactive optimization control strategy is adopted to optimize the reactive power distribution. The implementation method of the present invention can optimize and adjust the reactive power distribution in real time according to the voltage deviation degree of the grid connection point and the operating status of multiple reactive source equipment, realize the effective suppression of voltage exceeding the limit, ensure the safe and stable operation of the distribution network substation, and improve the power quality at the same time, providing technical support for the sustainable development of the power system.

[0144] It should be understood that the size of the serial numbers of the steps in the above implementation does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation method of the present invention.

[0145] The following is an implementation of the device of the present invention. For details not described in detail, reference may be made to the corresponding method implementation described above.

[0146] Figure 5 This is a functional block diagram of a distribution network area adaptive voltage regulation device provided by an embodiment of the present invention, referring to Figure 5 The distribution network station area adaptive voltage regulation device includes: a voltage deviation acquisition module 501, a reactive power calculation module 502, a first voltage management module 503 and a second voltage management module 504, wherein:

[0147] The voltage deviation acquisition module 501 is used to acquire the voltage deviation degree of the common connection point on the low voltage side of the transformer in the substation;

[0148] A reactive power calculation module 502, used to calculate the reactive power change required for voltage regulation according to the reactive power-voltage sensitivity and the voltage deviation degree;

[0149] The first voltage management module 503 is used to adjust the reactive output of the photovoltaic inverter, the reactive output of the SVG and the reactive output of the capacitor bank in sequence according to the reactive power variation, the reactive variation margin of the photovoltaic inverter, the reactive variation margin of the SVG, the reactive variation margin of the capacitor bank and the response speed of each reactive source when the voltage exceeds the limit;

[0150] The second voltage management module 504 is used to optimize reactive power distribution by adopting a continuous dynamic reactive power optimization control strategy when the voltage management is qualified.

[0151] Figure 6 is a functional block diagram of an electronic device provided by an embodiment of the present invention. Figure 6 As shown, the electronic device 6 of this embodiment includes: a processor 600 and a memory 601, wherein the memory 601 stores a computer program 602 that can be run on the processor 600. When the processor 600 executes the computer program 602, the steps in the above-mentioned distribution network station area adaptive voltage regulation method and the embodiment are implemented, for example Figure 1 Steps 101 to 104 are shown.

[0152] Exemplarily, the computer program 602 may be divided into one or more modules / units, and the one or more modules / units are stored in the memory 601 and executed by the processor 600 to implement the present invention.

[0153] The electronic device 6 may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The electronic device 6 may include, but is not limited to, a processor 600 and a memory 601. Those skilled in the art will appreciate that Figure 6 It is only an example of the electronic device 6 and does not constitute a limitation of the electronic device 6. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electronic device 6 may also include input and output devices, network access devices, buses, etc.

[0154] The processor 600 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0155] The memory 601 may be an internal storage unit of the electronic device 6, such as a hard disk or memory of the electronic device 6. The memory 601 may also be an external storage device of the electronic device 6, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 6. Further, the memory 601 may also include both an internal storage unit and an external storage device of the electronic device 6. The memory 601 is used to store the computer program 602 and other programs and data required by the electronic device 6. The memory 601 may also be used to temporarily store data that has been output or is to be output.

[0156] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the implementation method can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method implementation method, which will not be repeated here.

[0157] In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0158] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0159] In the embodiments provided by the present invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0160] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0161] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0162] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned implementation method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned various methods and device implementation methods. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium.

[0163] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for adaptive voltage regulation in a distribution network area, characterized in that: include: Obtain the voltage deviation degree of the common connection point on the low-voltage side of the transformer in the substation; Calculating the reactive power change required for voltage regulation according to the reactive power-voltage sensitivity and the voltage deviation degree; When the voltage exceeds the limit, the reactive output of the photovoltaic inverter, the reactive output of the SVG and the reactive output of the capacitor bank are adjusted in sequence according to the reactive power variation, the reactive variation margin of the photovoltaic inverter, the reactive variation margin of the SVG, the reactive variation margin of the capacitor bank and the response speed of each reactive source; When the voltage management is qualified, the continuous dynamic reactive power optimization control strategy is adopted to optimize the reactive power distribution.

2. The method for adaptive voltage regulation in a distribution network area according to claim 1, characterized in that: The step of calculating the reactive power variation required for voltage regulation according to the reactive power-voltage sensitivity and the voltage deviation degree includes: The reactive power change required for voltage regulation is calculated according to the first formula, the reactive power-voltage sensitivity and the voltage deviation degree, wherein the first formula is: In the formula, ΔQ is the reactive power change, k is the reactive power-voltage sensitivity coefficient, ΔU is the voltage deviation degree, Q2 is the reactive power output at the second time node, Q1 is the reactive power output at the first time node, U2 is the grid-connected point voltage at the second time node, and U1 is the grid-connected point voltage at the first time node.

3. The method for adaptive voltage regulation in a distribution network area according to claim 1, characterized in that: When the voltage exceeds the limit, the reactive output of the photovoltaic inverter, the reactive output of the SVG and the reactive output of the capacitor bank are adjusted according to the reactive power variation, the reactive variation margin of the photovoltaic inverter, the reactive variation margin of the SVG, the reactive variation margin of the capacitor bank and the response speed of each reactive source, including: Calculating the reactive power variation margin of the photovoltaic inverter, the reactive power variation margin of the SVG, and the reactive power variation margin of the capacitor bank; If the reactive power variation is less than or equal to the sum of the reactive power variation margin of the photovoltaic inverter and the reactive power variation margin of the SVG, adjusting the reactive output of the photovoltaic inverter and the reactive output of the SVG; Otherwise, the reactive output of the photovoltaic inverter and the reactive output of the SVG are adjusted first, and then the reactive output of the capacitor bank is adjusted.

4. The method for adaptive voltage regulation in a distribution network area according to claim 3, characterized in that: The calculating the reactive power variation margin of the photovoltaic inverter, the reactive power variation margin of the SVG and the reactive power variation margin of the capacitor bank comprises: The reactive power variation margin of the photovoltaic inverter is calculated according to a second formula, wherein the second formula is: Where ΔQ pv is the total reactive power regulation margin of the photovoltaic inverter, Q pv,i is the real-time reactive power of the ith photovoltaic inverter, Q pv_max,i and Q pv_min,i are the upper and lower limits of the reactive power adjustment of the i-th photovoltaic inverter, m is the number of photovoltaic inverters, U pcc is the voltage of the common connection point on the low voltage side of the transformer in the substation, U N is the rated voltage; The SVG reactive power variation margin is calculated according to a third formula, wherein the third formula is: Where ΔQ SVG is the total reactive power regulation margin of SVG, Q SVG,i is the real-time reactive power of the i-th SVG, Q SVG_max,i and Q SVG_min,i are the upper and lower limits of reactive power adjustment of the i-th SVG, respectively, and n is the number of SVGs; The reactive power variation margin of the capacitor bank is calculated according to a fourth formula, wherein the fourth formula is: Where ΔQ C is the total reactive power regulation margin of the capacitor bank, Q C,i is the real-time reactive power of the i-th capacitor bank, Q C_max,i and Q C_min,i are the upper and lower limits of the reactive power adjustment of the i-th capacitor bank, respectively, and l is the number of capacitor banks.

5. The method for adaptive voltage regulation in a distribution network area according to claim 3, characterized in that: The adjusting the reactive output of the photovoltaic inverter and the reactive output of the SVG includes: If the reactive power variation margin of the photovoltaic inverter is greater than or equal to the reactive power variation, only the reactive power output of the photovoltaic inverter is adjusted; Determine whether the first inequality holds, wherein the first inequality is: ΔQ≤ΔQ pb +μΔQ SVG In the formula, ΔQ is the change in reactive power, ΔQ pv is the total reactive power regulation margin of the photovoltaic inverter, μ is the first coefficient, ΔQ SVG It is the total reactive power regulation margin of SVG; If the first inequality holds, the reactive output of the photovoltaic inverter is adjusted according to the total reactive power regulation margin of the photovoltaic inverter, and the reactive output of the SVG is adjusted according to the difference between the reactive power change and the total reactive power regulation margin of the SVG.

6. The method for adaptive voltage regulation in a distribution network area according to any one of claims 1 to 5, characterized in that: The continuous dynamic reactive power optimization control strategy is adopted to optimize reactive power distribution, including: If the total reactive power regulation margin of the capacitor bank is greater than the reactive power variation, only the reactive power output of the capacitor bank is adjusted; If the sum of the total reactive power regulation margin of the capacitor bank and the total reactive power regulation margin of the photovoltaic inverter is greater than or equal to the reactive power variation, only the reactive output of the capacitor bank and the reactive output of the photovoltaic inverter are adjusted; If the sum of the total reactive power regulation margin of the capacitor group and the total reactive power regulation margin of the photovoltaic inverter is less than the reactive power change, the capacitor group adjusts the reactive output according to the total reactive power regulation margin of the capacitor group, the photovoltaic inverter adjusts the reactive output according to the total reactive power regulation margin of the photovoltaic inverter, and the SVG adjusts the reactive output according to the reactive under-regulation part.

7. The method for adaptive voltage regulation in a distribution network area according to any one of claims 1 to 5, characterized in that: The reactive power of the photovoltaic inverter, the SVG and the capacitor bank is distributed according to the fifth formula, wherein the fifth formula is: In the formula, Q pv_out,i , Q SVG_out,i and Q SVG_out,i are the reactive output regulation of the i-th photovoltaic inverter, the i-th SVG and the i-th capacitor bank, ΔQ pv,i , ΔQ SVG.i and ΔQ C,i are the reactive power regulation margins of the ith PV inverter, the ith SVG, and the ith capacitor bank, Q pv_out , Q SVG_out and Q C_out are the total reactive output regulation of the PV inverter, SVG and capacitor bank, respectively; m, n and l are the number of devices of the PV inverter, SVG and capacitor bank, respectively.

8. A distribution network area adaptive voltage regulation device, characterized in that: Used to implement the distribution network area adaptive voltage regulation method according to any one of claims 1 to 7, the distribution network area adaptive voltage regulation device comprises: A voltage deviation acquisition module is used to obtain the voltage deviation degree of the common connection point on the low-voltage side of the transformer in the substation; A reactive power calculation module, used to calculate the reactive power change required for voltage regulation according to the reactive power-voltage sensitivity and the voltage deviation degree; A first voltage management module is used to adjust the reactive output of the photovoltaic inverter, the reactive output of the SVG and the reactive output of the capacitor bank in sequence according to the reactive power variation, the reactive variation margin of the photovoltaic inverter, the reactive variation margin of the SVG, the reactive variation margin of the capacitor bank and the response speed of each reactive source when the voltage exceeds the limit; as well as, The second voltage management module is used to optimize reactive power distribution by adopting a continuous dynamic reactive power optimization control strategy when the voltage management is qualified.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method as claimed in any one of claims 1 to 7 are implemented.

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