Distributed photovoltaic localized power voltage regulation method, device, equipment and storage medium

Abstract

The application provides a distributed photovoltaic local power voltage regulation method, device, equipment and storage medium. The method comprises the following steps: first, acquiring regulation constants, such as substation voltage limit value, inverter power factor upper and lower limit, active power output lower limit and active and reactive power step regulation factor. The initial state is set, including voltage limit state, power factor and active power output. When the voltage is not limited, the maximum value of the three-phase voltage of the inverter is compared with the substation voltage limit value, and whether the power factor or the active power output is adjusted is determined. If the voltage is limited, the reverse comparison is carried out and the adjustment is carried out accordingly. The adjustment rule is calculated according to the current power factor and the active power output, combined with the step regulation factor. Finally, the power voltage of the distributed photovoltaic is adjusted according to the calculated regulation power factor and the regulation active power output. The method dynamically adjusts the inverter parameters through the preset value, realizes the stable control of the power grid voltage and the efficient operation of the photovoltaic.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic voltage regulation, and in particular relates to a method, device, equipment and storage medium for localized power voltage regulation of distributed photovoltaic systems. Background Technology

[0002] With the rapid development of renewable energy, distributed photovoltaic (PV) power generation systems have been widely adopted due to their flexibility, environmental friendliness, and economic benefits. However, the large-scale integration of distributed PV has also brought new challenges to the power grid, particularly in terms of voltage control and power regulation methods. Because the power output of distributed PV is affected by various factors such as sunlight and temperature, its power output is intermittent and uncertain, which may lead to voltage fluctuations in the power grid, affecting grid stability and power quality.

[0003] To address this challenge, the traditional approach is to rely on centralized voltage regulation equipment on the grid side, such as reactive power compensation devices and voltage regulators. However, these devices are not only costly to invest in, but also have a slow regulation response speed, making it difficult to meet the rapidly changing power demands of distributed photovoltaic systems.

[0004] Existing methods for regulating the power and voltage of distributed photovoltaic (PV) systems are mostly based on fixed control strategies, such as constant power factor control and constant voltage control. However, these methods often lack flexibility and cannot dynamically adjust according to the actual operating conditions of the power grid and the output characteristics of distributed PV systems. Furthermore, these methods fail to fully utilize the control capabilities of the distributed PV inverters themselves to achieve more refined power and voltage regulation. Summary of the Invention

[0005] The purpose of this application is to overcome the defects existing in the prior art and provide a method, apparatus, equipment and storage medium for localized power voltage regulation of distributed photovoltaic systems.

[0006] This application provides a method for localized power and voltage regulation of distributed photovoltaic power, including:

[0007] Obtain the power and voltage regulation settings for distributed photovoltaic systems, including the voltage over-limit value of the distribution area, the lower and upper limits of the inverter power factor, the lower limit of active power output, the active power step regulation factor, and the reactive power step regulation factor.

[0008] Set the initial state of the power regulation parameters for distributed photovoltaic systems, including: the voltage over-limit state of the distribution area, the inverter power factor, and the active power output;

[0009] If the voltage over-limit status is not specified, compare the maximum value of the inverter's three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, no operation is performed; if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, perform the following: if the current adjusted power factor is not less than the lower limit of the inverter power factor, calculate the adjusted power factor = -current power factor * (active power output - reactive power step adjustment factor); if the current adjusted power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active power output = current active power output * (active power output - active power step adjustment factor).

[0010] If the voltage over-limit status is yes, compare the maximum value of the inverter's three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, do nothing; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, perform the following: if the adjusted active power output is less than the active power output, calculate the adjusted active power output = current active power output * (active power output + active power step adjustment factor); if the adjusted active power output is equal to the active power output, calculate the power factor = -current power factor * (active power output + reactive power step adjustment factor).

[0011] The power voltage of the distributed photovoltaic system is adjusted based on the calculated power factor and the adjusted active power output.

[0012] Optionally, obtaining the power voltage regulation setting of distributed photovoltaic power includes:

[0013] The system receives user-inputted values ​​for transformer area voltage limits, inverter power factor lower and upper limits, active power output lower limit, active power step adjustment factor, and reactive power step adjustment factor through a preset interface.

[0014] Optionally, if the adjusted active power output is less than the active power output, the adjusted active power output is calculated as: Current active power output * (Active power output + Active power step adjustment factor), including:

[0015] If the adjusted power factor is less than the lower limit of the inverter power factor, then the adjusted power factor is set to the lower limit of the inverter power factor.

[0016] Optionally, if the adjusted active power output equals the active power output, the power factor is calculated as: -current power factor * (active power output + reactive power step adjustment factor), including:

[0017] If the adjusted active power output is less than the lower limit of active power output, then the adjusted active power output is set to the lower limit of active power output.

[0018] Optionally, it also includes:

[0019] If the adjusted power factor is greater than the inverter power factor in the initial state of the power adjustment parameters, then the adjusted power factor is set to the inverter power factor in the initial state of the power adjustment parameters.

[0020] Optionally, adjusting the power voltage of the distributed photovoltaic system based on the calculated power factor and the adjusted active power output includes:

[0021] The adjusted power factor and the adjusted active power output are encapsulated into a communication message and sent to the distributed photovoltaic inverter to achieve control of the inverter.

[0022] Optionally, if the maximum value of the three-phase voltage is less than the voltage limit of the distribution area, no operation is performed; if the maximum value of the three-phase voltage is greater than the voltage limit of the distribution area, the following steps are taken:

[0023] The voltage over-limit status is set to "Yes".

[0024] This application also provides a distributed photovoltaic localized power voltage regulation device, including: a data acquisition module, a parameter setting module, a processing module and a communication module;

[0025] The data acquisition module is used to acquire the power and voltage regulation settings of distributed photovoltaic systems, including the voltage over-limit value of the distribution area, the lower and upper limits of the inverter power factor, the lower limit of active power output, the active power step regulation factor, and the reactive power step regulation factor.

[0026] The parameter setting module is used to set the initial state of the power regulation parameters of distributed photovoltaics, including: the voltage over-limit state of the distribution area, the inverter power factor and the active power output.

[0027] The processing module is used to process: if the voltage over-limit status is not, compare the maximum value of the inverter's three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, do nothing; if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, execute: if the current adjusted power factor is not less than the lower limit of the inverter power factor, calculate the adjusted power factor = -current power factor * (active power output - reactive power step adjustment factor); if the current adjusted power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active power output = current active power output * (active power output - active power step adjustment factor).

[0028] If the voltage over-limit status is yes, compare the maximum value of the inverter's three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, do nothing; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, perform the following: if the adjusted active power output is less than the active power output, calculate the adjusted active power output = current active power output * (active power output + active power step adjustment factor); if the adjusted active power output is equal to the active power output, calculate the power factor = -current power factor * (active power output + reactive power step adjustment factor).

[0029] The communication module is used to adjust the power voltage of the distributed photovoltaic system based on the calculated power factor and the active power output.

[0030] Optionally, the data acquisition module, parameter setting module, processing module, and communication module all achieve data interaction through an internal bus.

[0031] Optionally, the acquisition module acquires the power voltage regulation setpoint of the distributed photovoltaic system, including:

[0032] The system receives user-inputted values ​​for transformer area voltage limits, inverter power factor lower and upper limits, active power output lower limit, active power step adjustment factor, and reactive power step adjustment factor through a preset interface.

[0033] Optionally, the processing module calculates that if the adjusted active power output is less than the active power output, the adjusted active power output = current active power output * (active power output + active power step adjustment factor), including:

[0034] If the adjusted power factor is less than the lower limit of the inverter power factor, then the adjusted power factor is set to the lower limit of the inverter power factor.

[0035] Optionally, the processing module calculates that if the adjusted active power output equals the active power output, the power factor is calculated as -current power factor * (active power output + reactive power step adjustment factor), including:

[0036] If the adjusted active power output is less than the lower limit of active power output, then the adjusted active power output is set to the lower limit of active power output.

[0037] Optionally, the processing module further calculates:

[0038] If the adjusted power factor is greater than the inverter power factor in the initial state of the power adjustment parameters, then the adjusted power factor is set to the inverter power factor in the initial state of the power adjustment parameters.

[0039] Optionally, the communication module adjusts the power voltage of the distributed photovoltaic system based on the calculated power factor and the adjusted active power output, including:

[0040] The adjusted power factor and the adjusted active power output are encapsulated into a communication message and sent to the distributed photovoltaic inverter to achieve control of the inverter.

[0041] This application also provides a distributed photovoltaic localized power voltage regulation device, including:

[0042] Memory;

[0043] The processor is configured to retrieve a computer-executable program for a distributed photovoltaic localized power voltage regulation method from the memory, and execute the following: obtaining the power voltage regulation setpoints of the distributed photovoltaic system, including the voltage over-limit value of the distribution area, the lower and upper limits of the inverter power factor, the lower limit of active power output, the active power step adjustment factor, and the reactive power step adjustment factor; setting the initial state of the power regulation parameters of the distributed photovoltaic system, including: the voltage over-limit state of the distribution area, the inverter power factor, and the active power output; if the voltage over-limit state is not specified, comparing the maximum value of the three-phase voltage of the inverter with the voltage over-limit value of the distribution area, including: if the maximum value of the three-phase voltage is less than the voltage over-limit value of the distribution area, no operation is performed; if the maximum value of the three-phase voltage is greater than the voltage over-limit value of the distribution area, executing the following: if the current regulated power factor is not less than the lower limit of the inverter power factor, calculating the regulated power factor = -current power factor * (active power output * reactive power output). (Power output - reactive power step adjustment factor); If the current adjusted power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active power output = current active power output * (active power output - active power step adjustment factor); If the voltage over-limit status is yes, compare the maximum value of the inverter three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, do not perform any operation; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, perform: if the adjusted active power output is less than the active power output, calculate the adjusted active power output = current active power output * (active power output + active power step adjustment factor); if the adjusted active power output is equal to the active power output, calculate the power factor = -current power factor * (active power output + reactive power step adjustment factor); adjust the power voltage of the distributed photovoltaic system according to the calculated adjusted power factor and the adjusted active power output.

[0044] This application provides a storage medium, including: storing a computer-executable program, the computer-executable program being invoked by a processor to execute the steps of the above-described distributed photovoltaic localized power voltage regulation method.

[0045] The beneficial effects of this application are:

[0046] This application provides a method for localized power and voltage regulation of distributed photovoltaic (PV) systems, comprising: obtaining power and voltage regulation settings for distributed PV systems, including substation voltage over-limit values, inverter power factor lower and upper limits, active power output lower limit, active power step adjustment factor, and reactive power step adjustment factor; setting initial states of power regulation parameters for distributed PV systems, including: substation voltage over-limit status, inverter power factor, and active power output; if the voltage over-limit status is not specified, comparing the maximum value of the inverter's three-phase voltage with the substation voltage over-limit value, including: if the maximum value of the three-phase voltage is less than the substation voltage over-limit value, no operation is performed; if the maximum value of the three-phase voltage is greater than the substation voltage over-limit value, performing: if the current regulated power factor is not less than the inverter power factor lower limit, calculating the regulated power factor = -current power factor * (active power output - reactive power step adjustment factor). If the current power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active power output = current active power output * (active power output - active power step adjustment factor); if the voltage over-limit status is yes, compare the maximum value of the inverter three-phase voltage with the over-limit value of the distribution area voltage, including: if the maximum value of the three-phase voltage is greater than the over-limit value of the distribution area voltage, do nothing; if the maximum value of the three-phase voltage is less than the over-limit value of the distribution area voltage, execute: if the adjusted active power output is less than the active power output, calculate the adjusted active power output = current active power output * (active power output + active power step adjustment factor); if the adjusted active power output is equal to the active power output, calculate the power factor = -current power factor * (active power output + reactive power step adjustment factor); adjust the power voltage of the distributed photovoltaic system according to the calculated adjusted power factor and the adjusted active power output. This application dynamically adjusts the power factor and active power output of the distributed photovoltaic inverter by setting a preset power and voltage regulation value, so as to achieve stable control of grid voltage and efficient operation of distributed photovoltaic. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the localized power and voltage regulation process for distributed photovoltaic systems in this application;

[0048] Figure 2 This is a schematic diagram of the distributed photovoltaic localized power voltage regulation device in this application.

[0049] Specific implementation method

[0050] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that various forms of implementation of the present disclosure are intended and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0051] Please refer to Figure 1 As shown, this application provides a method for localized power voltage regulation of distributed photovoltaic systems, the steps of which include:

[0052] S101. Obtain the power and voltage regulation settings of distributed photovoltaic systems, including the voltage over-limit value of the distribution area, the lower and upper limits of the inverter power factor, the lower limit of active power output, the active power step regulation factor, and the reactive power step regulation factor.

[0053] The voltage over-limit value (Uo) for the transformer substation is a preset voltage threshold used to determine whether the grid voltage exceeds the normal range. When the grid voltage is higher or lower than this value, it is considered an over-limit voltage, and corresponding adjustment measures need to be taken. In this application, the voltage over-limit value for the transformer substation is preferably set to 235V, that is, when the grid voltage exceeds 235V, it is considered an over-limit voltage.

[0054] The lower and upper limits of the inverter power factor are defined as the minimum and maximum values ​​of the inverter's output power factor (the ratio of active power to apparent power), respectively. The power factor reflects the degree to which the electrical energy output by the power source is effectively utilized. In this application, the lower limit of the power factor is preferably set to -0.8 (wherein, the power factor is typically between -1 and 1, but distributed photovoltaic inverters usually do not operate at a negative power factor; -0.8 here is to illustrate that the method can handle a wider range of power factor or special application scenarios), and the upper limit is set to 1.0. For actual photovoltaic inverters, their power factor is usually only positive and close to 1.0, indicating effective utilization of electrical energy.

[0055] The lower limit of active power output is the minimum active power output of the inverter, used to ensure that the photovoltaic system can continuously and stably supply power to the grid. In this application, the lower limit of active power output is preferably set to 70%, that is, the active power output of the inverter should not be lower than 70% of its rated capacity.

[0056] The active power step adjustment factor and the reactive power step adjustment factor are used to gradually adjust the active and reactive power outputs according to a predetermined ratio when the voltage exceeds the limit or when power adjustment is required. In this application, it is preferred that both the active power step adjustment factor and the reactive power step adjustment factor are set to 20%, which means that when adjustment is required, the active power or reactive power output will increase or decrease by 20% of the current output.

[0057] To obtain the power and voltage regulation settings of distributed photovoltaic (PV) systems, real-time operating data of the distributed PV systems is collected, including three-phase voltage, three-phase current, three-phase active power, three-phase reactive power, total active power, total reactive power, and total power factor. Then, the system communicates with the distributed PV inverters via the MODBUS RTU protocol, receives and parses the messages replied by the inverters, and realizes data acquisition and parsing.

[0058] After collecting real-time operating data, the system calculates the reactive power of distributed photovoltaic (PV) power based on preset power and voltage regulation settings (such as voltage over-limit values ​​for distribution areas, upper and lower limits of power factor, lower limit of active power output, active power step adjustment factor, and reactive power step adjustment factor), and generates corresponding power regulation commands. These commands are used to adjust the inverter's output power factor and active power output to achieve stable grid voltage control and efficient operation of distributed PV power.

[0059] S102. Set the initial state of the power regulation parameters of distributed photovoltaic, including: the voltage over-limit state of the distribution area, the inverter power factor and active power output.

[0060] In the operation and control of a distributed photovoltaic system, the initial state of the power regulation parameters is first set. Specifically, this includes setting the initial state of the following three key parameters:

[0061] The initial state for the voltage over-limit status of the transformer area is set to "No". This means that when no abnormal voltage situation is detected, the system assumes that the voltage of the transformer area is within the normal range by default.

[0062] Voltage over-limit status is an important basis for subsequent judgment on whether power regulation is needed. When the voltage of the transformer area is detected to exceed the preset over-limit value, the status will be updated to "yes" and the corresponding power regulation measures will be triggered.

[0063] The power factor of the distributed photovoltaic (PV) inverter is initially set to 1.0. The power factor is an indicator of the efficient utilization of electrical energy output from a power source, with a value ranging from -1 to 1. In distributed PV systems, inverters are typically configured to operate at a power factor close to 1.0 to ensure efficient energy utilization. Therefore, setting the inverter's power factor to 1.0 initially is reasonable, as it helps reduce reactive power losses and improves the overall system efficiency.

[0064] The active power output is initially set to 100%. Active power output refers to the ratio of the actual active power output of the inverter to its rated capacity. Setting the active power output to 100% initially means the inverter will operate at maximum capacity to fully utilize sunlight conditions and generate as much electrical energy as possible. However, in actual operation, the active power output may be dynamically adjusted based on factors such as sunlight intensity, grid demand, and system stability.

[0065] S103. If the voltage over-limit status is not specified, compare the maximum value of the inverter's three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, do nothing; if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, perform the following: if the current adjusted power factor is not less than the lower limit of the inverter power factor, calculate the adjusted power factor = -current power factor * (active power output - reactive power step adjustment factor); if the current adjusted power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active power output = current active power output * (active power output - active power step adjustment factor).

[0066] Inverter three-phase voltage: refers to the voltage values ​​of the three phases A, B, and C output by the inverter.

[0067] In the power voltage regulation process of a distributed photovoltaic system, when the voltage over-limit state is determined to be "no", the maximum value of the inverter's three-phase voltage is compared with the voltage over-limit value of the distribution area to determine whether further regulation measures need to be taken.

[0068] Comparison of the maximum three-phase voltage of the inverter with the voltage over-limit value of the transformer area:

[0069] First, obtain the maximum value of the three-phase voltage of the distributed photovoltaic inverter. Then, compare this maximum value with the preset voltage over-limit value (Uo) for the transformer area.

[0070] Perform different operations based on the comparison results:

[0071] Scenario 1: If the maximum value of the three-phase voltage is less than the voltage limit of the transformer area (Uo), no adjustment operation is required.

[0072] Case 2: If the maximum value of the three-phase voltage is greater than the voltage over-limit value (Uo) of the transformer area, the voltage over-limit state is set to yes, and then further adjustment logic is entered.

[0073] Further adjustment logic includes:

[0074] Reactive power regulation: When the voltage exceeds the limit and the maximum three-phase voltage exceeds Uo, first attempt to reduce the voltage by adjusting reactive power. If the current power factor is not less than the lower limit setting (e.g., -0.8), calculate the new power factor using the formula "-current power factor * (100% - reactive power step adjustment factor)". Note that although the formula uses "100% - reactive power step adjustment factor", in practice it should be converted to the corresponding proportional factor for calculation, ensuring the new power factor is not less than the lower limit setting. If the calculated result is less than the lower limit, directly use the lower limit power factor.

[0075] Adjusting the power factor to a negative value means that the inverter will generate inductive reactive power, which helps to reduce the grid voltage.

[0076] Active power regulation: When the power factor has reached the lower limit setting, but the voltage still exceeds the limit, the system begins to regulate active power. If the current active power output is not lower than the lower limit setting (e.g., 70%), the new regulated active power output is calculated according to the formula "current active power output * (100% - active power step adjustment factor)". Similarly, "100% - active power step adjustment factor" should be converted to the corresponding proportional factor for calculation, ensuring that the new active power output is not less than the lower limit setting. If the calculated result is less than the lower limit, the lower limit setting is directly used.

[0077] By reducing active power output, the grid voltage can be further reduced.

[0078] S104. If the voltage over-limit status is yes, compare the maximum value of the inverter's three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, do nothing; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, perform: if the adjusted active power output is less than the active power output, calculate the adjusted active power output = current active power output * (active power output + active power step adjustment factor); if the adjusted active power output is equal to the active power output, calculate the power factor = -current power factor * (active power output + reactive power step adjustment factor).

[0079] In the voltage regulation strategy of distributed photovoltaic systems, when the voltage over-limit state is determined to be "yes", the maximum value of the inverter's three-phase voltage is compared with the voltage over-limit value of the distribution area to determine whether the active power output or power factor needs to be adjusted.

[0080] Comparison of the maximum three-phase voltage with the over-limit value of the transformer area voltage:

[0081] First, the system obtains the maximum value of the three-phase voltage of the distributed photovoltaic inverter. Then, it compares this maximum value with the preset voltage over-limit value (Uo) for the transformer area.

[0082] Case 1: If the maximum value of the three-phase voltage exceeds the voltage limit of the transformer area (Uo), no further adjustment operation will be performed.

[0083] Case 2: If the maximum value of the three-phase voltage is less than the voltage limit of the transformer area (Uo), the system will enter further adjustment logic.

[0084] Further adjustments to the logic include:

[0085] If the current regulated active power output is less than the inverter's maximum allowable active power output (i.e., active power output), the new regulated active power output is calculated using the formula "current active power output * (100% + active power step adjustment factor)". It's important to note that although the formula uses "100% + active power step adjustment factor", in practice it should be converted to the corresponding proportional factor for calculation, ensuring that the new active power output does not exceed the inverter's maximum allowable value. If the calculated result is greater than the maximum value, the maximum value is directly taken.

[0086] If the current active power output is already equal to the inverter's maximum allowed active power output (i.e., active power output), the system attempts to further regulate the voltage by adjusting the power factor. At this point, the new power factor is calculated using the formula "-current power factor * (100% + reactive power step adjustment factor)". Similarly, "100% + reactive power step adjustment factor" should be converted to the corresponding proportional factor for calculation, ensuring that the new power factor is not less than -1 (because the power factor ranges from -1 to 1). If the calculated result is less than -1, then -1 is directly used.

[0087] S105. Adjust the power voltage of the distributed photovoltaic system according to the calculated power factor and the active power output.

[0088] The system will perform corresponding adjustment operations based on the power factor and active power output calculated in the above steps.

[0089] First, the adjusted power factor and adjusted active power output are obtained through a series of calculation steps. Then, based on the obtained adjusted power factor and adjusted active power output, the output power of the distributed photovoltaic inverter is adjusted. This includes adjusting the control algorithm inside the inverter to change its output voltage and current waveforms, thereby achieving the purpose of adjusting the power voltage.

[0090] During the adjustment process, the inverter's output is continuously monitored, including key parameters such as voltage, current, and power factor. If the adjustment effect is unsatisfactory or abnormalities are found, adjustments are made promptly to ensure stable system operation.

[0091] The power factor adjustment range is typically [-0.8, 1.0]. When the calculated power factor value is -1.0, since it is impossible to achieve -1.0 in practical applications (which would mean the inverter completely absorbs reactive power, which is impossible in reality), the system will set it to 1.0, that is, to allow the inverter to output active power as much as possible and reduce the absorption of reactive power.

[0092] The range for adjusting active power output is typically [70%, 100%]. This means that the system will adjust its active power output within the range of 70% to 100% as needed to meet the grid's demands and maintain system stability.

[0093] Specifically, the calculated power regulation command is encapsulated into a communication message for the distributed photovoltaic inverter. This message contains key information such as power factor and active power output, as well as necessary information such as the inverter's address and command type. The encapsulated communication message is then sent to the distributed photovoltaic inverter, including establishing a communication connection with the inverter using a specific communication protocol (such as the MODBUS protocol) and sending the message.

[0094] After receiving the message, the inverter parses the instruction information and adjusts its output power accordingly. This includes changing parameters such as the amplitude, frequency, and phase of the output voltage to achieve precise regulation of the power voltage.

[0095] like Figure 2 As shown, this application also provides a distributed photovoltaic localized power voltage regulation device, including: a data acquisition module, a parameter setting module, a processing module and a communication module;

[0096] The data acquisition module 201 is used to acquire the power and voltage regulation settings of distributed photovoltaics, including the voltage over-limit value of the distribution area, the lower and upper limits of the inverter power factor, the lower limit of active power output, the active power step regulation factor and the reactive power step regulation factor.

[0097] The parameter setting module 202 is used to set the initial state of the power regulation parameters of the distributed photovoltaic system, including: the voltage over-limit state of the distribution area, the inverter power factor, and the active power output.

[0098] The processing module 203 is used to process: if the voltage over-limit state is not, compare the maximum value of the inverter's three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, no operation is performed; if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, perform: if the current adjusted power factor is not less than the lower limit of the inverter power factor, calculate the adjusted power factor = -current power factor * (active power output - reactive power step adjustment factor); if the current adjusted power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active power output = current active power output * (active power output - active power step adjustment factor).

[0099] If the voltage over-limit status is yes, compare the maximum value of the inverter's three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, do nothing; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, perform the following: if the adjusted active power output is less than the active power output, calculate the adjusted active power output = current active power output * (active power output + active power step adjustment factor); if the adjusted active power output is equal to the active power output, calculate the power factor = -current power factor * (active power output + reactive power step adjustment factor).

[0100] The communication module 204 is used to adjust the power voltage of the distributed photovoltaic system based on the calculated power factor and the active power output.

[0101] Furthermore, the data acquisition module, parameter setting module, processing module, and communication module all achieve data interaction through an internal bus.

[0102] Furthermore, the acquisition module acquires the power voltage regulation setpoint of the distributed photovoltaic system, including:

[0103] The system receives user-inputted values ​​for transformer area voltage limits, inverter power factor lower and upper limits, active power output lower limit, active power step adjustment factor, and reactive power step adjustment factor through a preset interface.

[0104] Furthermore, the processing module calculates that if the adjusted active power output is less than the active power output, the adjusted active power output is calculated as: Current active power output * (Active power output + Active power step adjustment factor), including:

[0105] If the adjusted power factor is less than the lower limit of the inverter power factor, then the adjusted power factor is set to the lower limit of the inverter power factor.

[0106] Furthermore, the processing module calculates that if the adjusted active power output equals the active power output, it calculates the power factor = -current power factor * (active power output + reactive power step adjustment factor), including:

[0107] If the adjusted active power output is less than the lower limit of active power output, then the adjusted active power output is set to the lower limit of active power output.

[0108] Furthermore, the processing module calculation also includes:

[0109] If the adjusted power factor is greater than the inverter power factor in the initial state of the power adjustment parameters, then the adjusted power factor is set to the inverter power factor in the initial state of the power adjustment parameters.

[0110] Furthermore, the communication module adjusts the power voltage of the distributed photovoltaic system based on the calculated power factor and the adjusted active power output, including:

[0111] The adjusted power factor and the adjusted active power output are encapsulated into a communication message and sent to the distributed photovoltaic inverter to achieve control of the inverter.

[0112] This application also provides a distributed photovoltaic localized power voltage regulation device, including:

[0113] Memory;

[0114] The processor is configured to retrieve a computer-executable program for a distributed photovoltaic localized power voltage regulation method from the memory, and execute the following: obtaining the power voltage regulation setpoints of the distributed photovoltaic system, including the voltage over-limit value of the distribution area, the lower and upper limits of the inverter power factor, the lower limit of active power output, the active power step adjustment factor, and the reactive power step adjustment factor; setting the initial state of the power regulation parameters of the distributed photovoltaic system, including: the voltage over-limit state of the distribution area, the inverter power factor, and the active power output; if the voltage over-limit state is not specified, comparing the maximum value of the three-phase voltage of the inverter with the voltage over-limit value of the distribution area, including: if the maximum value of the three-phase voltage is less than the voltage over-limit value of the distribution area, no operation is performed; if the maximum value of the three-phase voltage is greater than the voltage over-limit value of the distribution area, executing the following: if the current regulated power factor is not less than the lower limit of the inverter power factor, calculating the regulated power factor = -current power factor * (active power output * reactive power output). (Power output - reactive power step adjustment factor); If the current adjusted power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active power output = current active power output * (active power output - active power step adjustment factor); If the voltage over-limit status is yes, compare the maximum value of the inverter three-phase voltage with the over-limit value of the transformer area voltage, including: if the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage, do not perform any operation; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, perform: if the adjusted active power output is less than the active power output, calculate the adjusted active power output = current active power output * (active power output + active power step adjustment factor); if the adjusted active power output is equal to the active power output, calculate the power factor = -current power factor * (active power output + reactive power step adjustment factor); adjust the power voltage of the distributed photovoltaic system according to the calculated adjusted power factor and the adjusted active power output.

[0115] This application provides a storage medium, including: storing a computer-executable program, the computer-executable program being invoked by a processor to execute the steps of the above-described distributed photovoltaic localized power voltage regulation method.

Claims

1. A method for distributed photovoltaic localized power voltage regulation, characterized in that, The method comprises the following steps: obtaining power-voltage regulation constants of the distributed photovoltaic, including transformer area voltage limit value, inverter power factor lower limit and upper limit, active power lower limit, active power step regulation factor and reactive power step regulation factor; setting initial state of power regulation parameters of the distributed photovoltaic, including setting initial state of transformer area voltage limit state as "no", setting inverter power factor as initial value and setting active power as initial value; If the voltage out-of-limit state is no, compare the maximum value of the inverter three-phase voltage with the voltage out-of-limit value of the area, including: if the maximum value of the three-phase voltage is less than the voltage out-of-limit value of the area, do not operate; if the maximum value of the three-phase voltage is greater than the voltage out-of-limit value of the area, execute: set the voltage out-of-limit state to yes; if the current power factor is not less than the lower limit of the inverter power factor, calculate the adjusted power factor = - current power factor (100%-reactive step adjustment factor); if the current adjusted power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active output = current active output (100%-active step adjustment factor); If the voltage out-of-limit status is yes, comparing the maximum value of the inverter three-phase voltage with the voltage out-of-limit value of the area, comprising: if the maximum value of the three-phase voltage is greater than the voltage out-of-limit value of the area, no operation is performed; if the maximum value of the three-phase voltage is less than the voltage out-of-limit value of the area, performing: if the current adjusted active power is less than the maximum active power allowed by the inverter, calculating a new adjusted active power = current active power (100%+active step adjustment factor); if the current adjusted active power is equal to the maximum active power allowed by the inverter, calculating an adjusted power factor = -current power factor (100%+reactive step adjustment factor); adjusting power-voltage of the distributed photovoltaic according to calculated regulation power factor and regulation active power.

2. The method of claim 1, wherein, The method comprises the following steps: receiving transformer area voltage limit value, inverter power factor lower limit and upper limit, active power lower limit, active power step regulation factor and reactive power step regulation factor input by a user through a preset interface.

3. The method of claim 1, wherein, if the current power factor is not less than the inverter power factor lower limit, calculate adjusted power factor = - current power factor (100% - reactive step adjustment factor), comprising: if the calculated regulation power factor is less than the inverter power factor lower limit, setting the regulation power factor as the inverter power factor lower limit.

4. The method of claim 1, wherein, if the current regulated power factor is equal to the inverter power factor lower limit, calculate regulated active output = current active output (100%-active step regulation factor), comprising: if the calculated regulation active power is less than the active power lower limit, setting the regulation active power as the active power lower limit.

5. The method of claim 1, wherein, The method further comprises the following steps: if the regulation power factor is greater than the inverter power factor initial value in the set initial state of power regulation parameters, setting the regulation power factor as the inverter power factor initial value in the initial state of power regulation parameters.

6. The method of claim 1, wherein, adjusting power-voltage of the distributed photovoltaic according to calculated regulation power factor and regulation active power, including encapsulating the calculated regulation power factor and regulation active power into a communication message and sending the communication message to the distributed photovoltaic inverter to realize control of the inverter.

7. A distributed photovoltaic localized power voltage regulating device, comprising: The method comprises the following steps: a data acquisition module, a parameter setting module, a processing module and a communication module; the data acquisition module is configured to obtain power-voltage regulation constants of the distributed photovoltaic, including transformer area voltage limit value, inverter power factor lower limit and upper limit, active power lower limit, active power step regulation factor and reactive power step regulation factor; the parameter setting module is configured to set initial state of power regulation parameters of the distributed photovoltaic, including setting initial state of transformer area voltage limit state as "no", setting inverter power factor as initial value and setting active power as initial value; the processing module is configured to process: If the voltage out-of-limit state is no, compare the maximum of the inverter three-phase voltage with the voltage out-of-limit value of the area, including: if the maximum of the three-phase voltage is less than the voltage out-of-limit value of the area, do not operate; if the maximum of the three-phase voltage is greater than the voltage out-of-limit value of the area, execute: set the voltage out-of-limit state to yes; if the current power factor is not less than the lower limit of the inverter power factor, calculate the adjusted power factor = - current power factor (100%- reactive step adjustment factor); if the current adjusted power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active output = current active output (100%- active step adjustment factor); If the voltage out-of-limit status is yes, comparing the maximum value of the inverter three-phase voltage with the voltage out-of-limit value of the area, comprising: if the maximum value of the three-phase voltage is greater than the voltage out-of-limit value of the area, not operating; if the maximum value of the three-phase voltage is less than the voltage out-of-limit value of the area, executing: if the current regulated active power is less than the maximum active power allowed by the inverter, calculating a new regulated active power = current active power (100%+active step regulation factor); if the current regulated active power is equal to the maximum active power allowed by the inverter, calculating a regulated power factor = -current power factor (100%+reactive step regulation factor); the communication module is configured to adjust power-voltage of the distributed photovoltaic according to calculated regulation power factor and regulation active power.

8. The distributed photovoltaic localized power voltage regulating device of claim 7, wherein, The data acquisition module, the parameter setting module, the processing module and the communication module all realize data interaction through an internal bus.

9. The distributed photovoltaic localized power voltage regulating device of claim 7, wherein, The data acquisition module is configured to obtain power-voltage regulation constants of the distributed photovoltaic, including: the data acquisition module is configured to receive transformer area voltage limit value, inverter power factor lower limit and upper limit, active power lower limit, active power step regulation factor and reactive power step regulation factor input by a user through a preset interface.

10. The distributed photovoltaic localized power voltage regulating device of claim 7, wherein, if the current power factor is not less than the inverter power factor lower limit, calculate adjusted power factor = - current power factor (100% - reactive step adjustment factor), comprising: if the calculated regulation power factor is less than the inverter power factor lower limit, setting the regulation power factor as the inverter power factor lower limit.

11. The distributed photovoltaic localized power voltage regulating device of claim 7, wherein, if the current regulated power factor is equal to the inverter power factor lower limit, calculate regulated active output = current active output (100%-active step regulation factor), comprising: if the calculated regulation active power is less than the active power lower limit, setting the regulation active power as the active power lower limit.

12. The distributed photovoltaic localized power voltage regulating device of claim 7, wherein, The processing module is further configured to process: If the adjusted power factor is greater than the initial value of the inverter power factor in the initial state of the power adjustment parameter, the adjusted power factor is set to the initial value of the inverter power factor in the initial state of the power adjustment parameter.

13. The distributed photovoltaic localized power voltage regulating device of claim 7, wherein, The communication module adjusts the power voltage of the distributed photovoltaic according to the calculated adjusted power factor and the adjusted active power output, and the adjusting comprises: The calculated adjusted power factor and the adjusted active power output are packaged into a communication message and sent to the distributed photovoltaic inverter to realize the control of the inverter.

14. A distributed photovoltaic localized power voltage regulating device, comprising: The method comprises: a memory; a processor configured to retrieve a computer executable program of the distributed photovoltaic localized power voltage adjustment method according to any one of claims 1-6 from the memory and execute the steps of: obtaining power voltage adjustment constants of the distributed photovoltaic, including a substation voltage out-of-limit value, lower and upper limits of the inverter power factor, an active power lower limit, an active power step adjustment factor and a reactive power step adjustment factor; setting an initial state of power adjustment parameters of the distributed photovoltaic, including setting the initial state of the substation voltage out-of-limit state as "no", setting the inverter power factor as an initial value and setting the active power as an initial value; If the voltage out-of-limit state is no, compare the maximum of the inverter three-phase voltage with the voltage out-of-limit value of the area, including: if the maximum of the three-phase voltage is less than the voltage out-of-limit value of the area, do not operate; if the maximum of the three-phase voltage is greater than the voltage out-of-limit value of the area, execute: set the voltage out-of-limit state to yes; if the current power factor is not less than the lower limit of the inverter power factor, calculate the adjusted power factor = - current power factor (100%- reactive step adjustment factor); if the current adjusted power factor is equal to the lower limit of the inverter power factor, calculate the adjusted active output = current active output (100%- active step adjustment factor); If the voltage out-of-limit status is yes, comparing the maximum value of the inverter three-phase voltage with the voltage out-of-limit value of the area, comprising: if the maximum value of the three-phase voltage is greater than the voltage out-of-limit value of the area, not operating; if the maximum value of the three-phase voltage is less than the voltage out-of-limit value of the area, executing: if the current regulated active power is less than the maximum active power allowed by the inverter, calculating a new regulated active power = current active power (100%+active step regulation factor); if the current regulated active power is equal to the maximum active power allowed by the inverter, calculating a regulated power factor = -current power factor (100%+reactive step regulation factor); adjusting the power voltage of the distributed photovoltaic according to the calculated adjusted power factor and the adjusted active power output.

15. A storage medium, characterized by The computer executable program is stored in the memory and is configured to be retrieved and executed by the processor to execute the steps of the distributed photovoltaic localized power voltage adjustment method according to any one of claims 1-6. ​

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