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

Abstract

The invention provides a distributed photovoltaic localization power voltage regulation method and device, equipment and a storage medium. The method further comprises the following steps: firstly, acquiring adjusting constant values, such as a transformer area voltage out-of-limit value, upper and lower limits of an inverter power factor, an active output lower limit and active and reactive step adjusting factors; initial states including a voltage out-of-limit state, a power factor and active power output are set; and when the voltage does not exceed the limit, comparing the maximum value of the three-phase voltage of the inverter with the voltage out-of-limit value of the transformer area so as to decide whether to adjust the power factor or the active power output. And if the voltage is out of limit, performing reverse comparison and adjusting according to the result. The adjustment rule calculates a new value according to the current power factor and the active power output in combination with the step adjustment factor. And finally, adjusting the distributed photovoltaic power voltage according to the adjusted power factor and the adjusted active power output which are obtained through calculation. According to the method, inverter parameters are dynamically adjusted through a preset set value, and power grid voltage stable control and photovoltaic efficient operation are achieved.

Description

Technical Field

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

[0002] With the rapid development of renewable energy, distributed photovoltaic power generation systems have been widely used due to their flexibility, environmental protection and economic benefits. However, the large-scale access of distributed photovoltaics has also brought new challenges to the power grid, especially in terms of voltage control and power regulation methods. Since the power output of distributed photovoltaics is affected by multiple factors such as light and temperature, its power output is intermittent and uncertain, which may cause grid voltage fluctuations and affect the stability and power supply quality of the grid.

[0003] To meet 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 not only have high investment costs, but also have slow regulation response speeds, making it difficult to meet the rapidly changing power demands of distributed photovoltaics.

[0004] Most of the existing distributed photovoltaic power and voltage regulation methods are based on fixed control strategies, such as constant power factor control, constant voltage control, etc., but these methods often lack flexibility and cannot be dynamically adjusted according to the actual operation status of the power grid and the output characteristics of distributed photovoltaics. In addition, these methods also fail to fully utilize the control capabilities of distributed photovoltaic 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 in the above-mentioned prior art and provide a distributed photovoltaic localized power voltage regulation method, device, equipment and storage medium.

[0006] The present application provides a distributed photovoltaic localized power voltage regulation method, comprising:

[0007] Obtain the power and voltage regulation values ​​of distributed photovoltaics, including the voltage over-limit value of the substation, the lower and upper limits of the inverter power factor, the lower limit of active output, the active step regulation factor, and the reactive step regulation factor;

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

[0009] If the voltage over-limit state is no, the maximum value of the three-phase voltage of the inverter is compared 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, the following is performed: if the current adjustment power factor is not less than the lower limit of the inverter power factor, the adjustment power factor is calculated as -current power factor*(active power output-reactive power step adjustment factor); if the current adjustment power factor is equal to the lower limit of the inverter power factor, the adjustment active power output is calculated as current active power output*(active power output-active power step adjustment factor);

[0010] If the voltage over-limit state is yes, the maximum value of the three-phase voltage of the inverter is compared 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, no operation is performed; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, the following is performed: if the adjusted active output is less than the active output, the adjusted active output is calculated as = current active output * (active output + active step adjustment factor); if the adjusted active output is equal to the active output, the power factor is calculated as = - current power factor * (active output + reactive step adjustment factor);

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

[0012] Optionally, obtaining a power and voltage regulation constant of distributed photovoltaics includes:

[0013] The preset interface receives the over-limit value of the area voltage, the lower and upper limits of the inverter power factor, the lower limit of the active output, the active step adjustment factor and the reactive step adjustment factor input by the user.

[0014] Optionally, if the adjusted active output is less than the active output, the adjusted active output=current active output*(active output+active step adjustment factor) is calculated, including:

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

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

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

[0018] Optionally, it also includes:

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

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

[0021] The adjusted power factor and the adjusted active output are packaged as 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 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, the operation includes:

[0023] Set the voltage over-limit status to yes.

[0024] The present 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 obtain the power and voltage adjustment fixed values ​​of distributed photovoltaics, including the voltage over-limit value of the station area, the lower and upper limits of the inverter power factor, the lower limit of the active output, the active step adjustment factor and the reactive step adjustment factor;

[0026] The parameter setting module is used to set the initial state of the power adjustment parameters of the distributed photovoltaic, including: the voltage over-limit state of the station area, the power factor of the inverter and the active output;

[0027] The processing module is used to process: if the voltage over-limit state is no, compare the maximum value of the three-phase voltage of the inverter 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 not perform any operation; 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 adjustment power factor is not less than the lower limit of the inverter power factor, calculate the adjustment power factor = - current power factor * (active output - reactive step adjustment factor); if the current adjustment power factor is equal to the lower limit of the inverter power factor, calculate the adjustment active output = current active output * (active output - active step adjustment factor);

[0028] If the voltage over-limit state is yes, the maximum value of the three-phase voltage of the inverter is compared 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, no operation is performed; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, the following is performed: if the adjusted active output is less than the active output, the adjusted active output is calculated as = current active output * (active output + active step adjustment factor); if the adjusted active output is equal to the active output, the power factor is calculated as = - current power factor * (active output + reactive step adjustment factor);

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

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

[0031] Optionally, the acquisition module acquires the power voltage adjustment constant value of the distributed photovoltaic system, including:

[0032] The preset interface receives the over-limit value of the area voltage, the lower and upper limits of the inverter power factor, the lower limit of the active output, the active step adjustment factor and the reactive step adjustment factor input by the user.

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

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

[0035] Optionally, the processing module calculates if the adjusted active output is equal to the active output, and calculates the power factor=-current power factor*(active output+reactive step adjustment factor), including:

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

[0037] Optionally, the processing module calculation further includes:

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

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

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

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

[0042] Memory;

[0043] A processor is used to retrieve the computer executable program of the above-mentioned distributed photovoltaic localized power voltage regulation method from the memory, and execute: obtaining the power voltage regulation constant of the distributed photovoltaic, including the area voltage over-limit value, the inverter power factor lower limit and upper limit, the active output lower limit, the active step regulation factor and the reactive step regulation factor; setting the initial state of the power regulation parameters of the distributed photovoltaic, including: the area voltage over-limit state, the inverter power factor and the active output; if the voltage over-limit state is no, the maximum value of the inverter three-phase voltage is compared with the area voltage over-limit value, including: if the maximum value of the three-phase voltage is less than the area voltage over-limit value, no operation is performed; if the maximum value of the three-phase voltage is greater than the area voltage over-limit value, executing: if the current adjustment power factor is not less than the inverter power factor lower limit, calculating the adjustment power factor = -current power factor*(active power factor Output-reactive step adjustment factor); if the current adjustment power factor is equal to the lower limit of the inverter power factor, calculate the adjustment active output = current active output * (active output-active step adjustment factor); if the voltage over-limit state is yes, compare the maximum value of the inverter three-phase voltage with the station area voltage over-limit value, including: if the maximum value of the three-phase voltage is greater than the station area voltage over-limit value, do not operate; if the maximum value of the three-phase voltage is less than the station area voltage over-limit value, execute: if the adjustment active output is less than the active output, calculate the adjustment active output = current active output * (active output + active step adjustment factor); if the adjustment active output is equal to the active output, calculate the power factor = -current power factor * (active output + reactive step adjustment factor); adjust the power voltage of the distributed photovoltaic according to the calculated adjustment power factor and the adjustment active output.

[0044] The present application provides a storage medium, comprising: a computer executable program stored therein, wherein the computer executable program is used to be called by a processor to execute the steps of the above-mentioned distributed photovoltaic localized power voltage regulation method.

[0045] The beneficial effects of this application are:

[0046] The present application provides a distributed photovoltaic localized power voltage regulation method, including: obtaining a power voltage regulation constant of distributed photovoltaics, including an over-limit value of a station area voltage, a lower limit and an upper limit of an inverter power factor, a lower limit of active output, an active step regulation factor, and an active step regulation factor; setting an initial state of power regulation parameters of distributed photovoltaics, including: an over-limit state of a station area voltage, an inverter power factor and an active output; if the voltage over-limit state is no, comparing the maximum value of the three-phase voltage of the inverter with the over-limit value of the station area voltage, including: if the maximum value of the three-phase voltage is less than the over-limit value of the station area voltage, no operation is performed; if the maximum value of the three-phase voltage is greater than the over-limit value of the station area voltage, executing: if the current regulation power factor is not less than the lower limit of the inverter power factor, calculating the regulation power factor = -current power factor*(active output-reactive step regulation factor) number); if the current regulated power factor is equal to the lower limit of the inverter power factor, calculate the regulated active output = current active output * (active output - active step regulation factor); if the voltage over-limit state is yes, compare the maximum value of the three-phase voltage of the inverter with the over-limit value of the station area voltage, including: if the maximum value of the three-phase voltage is greater than the over-limit value of the station 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 station area voltage, execute: if the regulated active output is less than the active output, calculate the regulated active output = current active output * (active output + active step regulation factor); if the regulated active output is equal to the active output, calculate the power factor = -current power factor * (active output + reactive step regulation factor); adjust the power voltage of the distributed photovoltaic according to the calculated regulated power factor and the regulated active output. The present application dynamically adjusts the power factor and active output of the distributed photovoltaic inverter through a preset power and voltage regulation constant to achieve stable control of the grid voltage and efficient operation of the distributed photovoltaic. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the distributed photovoltaic localized power voltage regulation process 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] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that various forms of implementing the present disclosure should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0051] Please refer to Figure 1 As shown, the present application provides a distributed photovoltaic localized power voltage regulation method, the steps of the method comprising:

[0052] S101. Obtain power and voltage regulation constants of distributed photovoltaics, including the voltage over-limit value of the substation, the lower and upper limits of the inverter power factor, the lower limit of active output, the active step regulation factor, and the reactive step regulation factor.

[0053] The voltage over-limit value (Uo) of the 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 that the voltage is over-limit and corresponding adjustment measures need to be taken. In this application, the substation voltage over-limit value is preferably set to 235V, that is, when the grid voltage exceeds 235V, it is considered that the voltage is over-limit.

[0054] The lower limit and upper limit of the inverter power factor respectively set the minimum and maximum values ​​of the inverter output power factor (the ratio of active power to apparent power). The power factor reflects the extent to which the electric energy output by the power supply is effectively utilized. In the present application, the lower limit of the power factor is preferably set to -0.8 (wherein, the power factor is usually between -1 and 1, but the distributed photovoltaic inverter does not usually operate at a negative power factor, and the -0.8 here is to illustrate that the method can handle a wider range of power factors or special application scenarios), and the upper limit is set to 1.0. For an actual photovoltaic inverter, its power factor will usually only be a positive number and close to 1.0, indicating the effective utilization of electric energy.

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

[0056] The active step adjustment factor and the reactive step adjustment factor are used to gradually adjust the active and reactive outputs according to a predetermined ratio when the voltage exceeds the limit or the power needs to be adjusted. In the present application, the active step adjustment factor and the reactive step adjustment factor are preferably set to 20%, indicating that when adjustment is required, the active or reactive output will increase or decrease by 20% of the current output.

[0057] In order to obtain the power and voltage regulation constants of distributed photovoltaics, the real-time operation data of distributed photovoltaics, 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, are collected, and then the MODBUS RTU protocol is used to communicate with the distributed photovoltaic inverter, receive and parse the message replied by the inverter, and realize data collection and analysis.

[0058] After collecting real-time operation data, the reactive power of distributed photovoltaics is calculated and corresponding power adjustment instructions are generated according to the preset power and voltage adjustment values ​​(such as the voltage over-limit value of the substation, the upper and lower limits of the power factor, the lower limit of the active output, the active step adjustment factor and the reactive step adjustment factor, etc.). These instructions will be used to adjust the output power factor and active output of the inverter to achieve stable control of the grid voltage and efficient operation of distributed photovoltaics.

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

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

[0061] The initial state of the voltage over-limit status of the substation is set to "No". This means that when no voltage abnormality is detected, the system defaults to believing that the substation voltage is within the normal range.

[0062] The voltage over-limit status is an important basis for determining whether power regulation is needed. When the voltage in the substation exceeds 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 inverter is initially set to 1.0. The power factor is an indicator that measures the degree of effective utilization of the power output of the power supply, and its value is between -1 and 1. In a distributed photovoltaic system, the inverter is usually configured to operate at a power factor close to 1.0 to ensure efficient use of electrical energy. Therefore, it is reasonable to set the inverter power factor to 1.0 in the initial state, which helps to reduce the loss of reactive power and improve the overall efficiency of the system.

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

[0065] S103. If the voltage over-limit state is no, compare the maximum value of the three-phase voltage of the inverter with the over-limit value of the substation voltage, including: if the maximum value of the three-phase voltage is less than the over-limit value of the substation voltage, do not perform any operation; if the maximum value of the three-phase voltage is greater than the over-limit value of the substation voltage, execute: if the current regulated power factor is not less than the lower limit of the inverter power factor, calculate the regulated power factor = - current power factor * (active output - reactive step regulation factor); if the current regulated power factor is equal to the lower limit of the inverter power factor, calculate the regulated active output = current active output * (active output - active step regulation 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 the distributed photovoltaic system, when the voltage over-limit state is judged as "no", the maximum value of the inverter three-phase voltage is compared with the over-limit value of the station voltage to determine whether further regulation measures are needed.

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

[0069] First, the maximum value of the three-phase voltage of the distributed photovoltaic inverter is obtained. Then, this maximum value is compared with the preset over-limit value (Uo) of the substation voltage.

[0070] Perform different actions based on the comparison result:

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

[0072] Case 2: If the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage (Uo), 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 value of the three-phase voltage exceeds Uo, first try to reduce the voltage by adjusting the reactive power. If the current power factor is not less than the power factor lower limit setting value (for example, -0.8), the new adjustment power factor is calculated according to the formula "-current power factor * (100%-reactive step adjustment factor)". It should be noted here that although "100%-reactive step adjustment factor" is used in the formula, it should be converted into the corresponding proportional factor for calculation in actual operation, and ensure that the new power factor is not less than the power factor lower limit setting value. If the calculation result is less than the lower limit value, the power factor lower limit value is directly taken.

[0075] Regulating 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 regulated power factor has reached the power factor lower limit setting value, but the voltage is still over the limit, the system starts to regulate the active power. If the current active output is not lower than the active output lower limit setting value (for example, 70%), the new regulated active output is calculated according to the formula "current active output * (100% - active step adjustment factor)". Similarly, the "100% - active step adjustment factor" here should be converted into the corresponding proportional factor for calculation, and ensure that the new active output is not less than the active output lower limit setting value. If the calculated result is less than the lower limit value, the active output lower limit value is directly taken.

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

[0078] S104, if the voltage over-limit state is yes, compare the maximum value of the three-phase voltage of the inverter 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 output is less than the active output, calculate the adjusted active output = current active output * (active output + active step adjustment factor); if the adjusted active output is equal to the active output, calculate the power factor = -current power factor * (active output + reactive step adjustment factor);

[0079] In the voltage regulation strategy of the distributed photovoltaic system, when the voltage over-limit state is judged as "yes", the maximum value of the inverter three-phase voltage is compared with the over-limit value of the station voltage to determine whether the active output or power factor needs to be adjusted.

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

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

[0082] Case 1: If the maximum value of the three-phase voltage is greater than the over-limit value of the transformer area voltage (Uo), no further regulation operation is performed.

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

[0084] Further adjust the logic, including:

[0085] If the current regulated active output is less than the maximum active output allowed by the inverter (i.e., active output), the new regulated active output is calculated according to the formula "current active output * (100% + active step adjustment factor)". It should be noted here that although "100% + active step adjustment factor" is used in the formula, it should be converted into the corresponding proportional factor for calculation in actual operation, and ensure that the new active output is not greater than the maximum value allowed by the inverter. If the calculated result is greater than the maximum value, the maximum value is directly taken.

[0086] If the current regulated active output is equal to the maximum active output allowed by the inverter (i.e., active output), the system attempts to further regulate the voltage by adjusting the power factor. At this time, the new regulated power factor is calculated according to the formula "-current power factor * (100% + reactive step adjustment factor)". Similarly, the "100% + reactive step adjustment factor" here should be converted into the corresponding proportional factor for calculation, and ensure that the new power factor is not less than -1 (because the power factor range is -1 to 1). If the calculated result is less than -1, it is directly taken as -1.

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

[0088] The corresponding adjustment operation will be performed according to the adjustment power factor and adjustment active output calculated in the above steps.

[0089] First, the regulated power factor and the regulated active output obtained through a series of calculation steps are obtained. Then, the output power of the distributed photovoltaic inverter is adjusted according to the obtained regulated power factor and regulated active output. This includes: adjusting the control algorithm inside the inverter to change the voltage and current waveform of its output, so as to achieve the purpose of regulating the power voltage.

[0090] During the adjustment process, the inverter output is continuously monitored, including key parameters such as voltage, current, power factor, etc. If the adjustment effect is not ideal or there are abnormal conditions, timely adjustments are made to ensure the stable operation of the system.

[0091] The power factor adjustment range is usually [-0.8, 1.0]. When the calculated power factor value is -1.0, since the power factor cannot reach -1.0 in actual applications (this means that the inverter completely absorbs reactive power, but in reality the inverter cannot do this completely), the system will set it to 1.0, that is, let the inverter output active power as much as possible and reduce the absorption of reactive power.

[0092] The range of active power output is usually [70%, 100%]. This means that the system will adjust the active power output within the range of 70% to 100% as needed to meet the needs of the power grid and maintain the stability of the system.

[0093] Specifically, the calculated power adjustment instructions are encapsulated as a communication message for the distributed photovoltaic inverter. This message contains key information such as power factor and active output, as well as necessary information such as the address of the inverter and the instruction type. The encapsulated communication message is sent to the distributed photovoltaic inverter, including using a specific communication protocol (such as the MODBUS protocol) to establish a communication connection with the inverter and send the message.

[0094] After receiving the message, the inverter parses the command information and adjusts its output power according to the command, which includes changing the output voltage amplitude, frequency, phase and other parameters to achieve precise regulation of power voltage.

[0095] like Figure 2 As shown, the present 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 obtain the power and voltage adjustment values ​​of distributed photovoltaics, including the voltage over-limit value of the station area, the lower and upper limits of the inverter power factor, the lower limit of the active output, the active step adjustment factor and the reactive step adjustment factor;

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

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

[0099] If the voltage over-limit state is yes, the maximum value of the three-phase voltage of the inverter is compared 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, no operation is performed; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, the following is performed: if the adjusted active output is less than the active output, the adjusted active output is calculated as = current active output * (active output + active step adjustment factor); if the adjusted active output is equal to the active output, the power factor is calculated as = - current power factor * (active output + reactive step adjustment factor);

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

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

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

[0103] The preset interface receives the over-limit value of the area voltage, the lower and upper limits of the inverter power factor, the lower limit of the active output, the active step adjustment factor and the reactive step adjustment factor input by the user.

[0104] Further, the processing module calculates if the adjusted active output is less than the active output, and calculates the adjusted active output = current active output * (active output + active step adjustment factor), including:

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

[0106] Further, the processing module calculates if the adjusted active output is equal to the active output, and calculates the power factor=-current power factor*(active output+reactive step adjustment factor), including:

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

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

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

[0110] Further, the communication module adjusts the power voltage of the distributed photovoltaic system according to the calculated adjusted power factor and the adjusted active output, including:

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

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

[0113] Memory;

[0114] A processor is used to retrieve the computer executable program of the above-mentioned distributed photovoltaic localized power voltage regulation method from the memory, and execute: obtaining the power voltage regulation constant of the distributed photovoltaic, including the area voltage over-limit value, the inverter power factor lower limit and upper limit, the active output lower limit, the active step regulation factor and the reactive step regulation factor; setting the initial state of the power regulation parameters of the distributed photovoltaic, including: the area voltage over-limit state, the inverter power factor and the active output; if the voltage over-limit state is no, the maximum value of the inverter three-phase voltage is compared with the area voltage over-limit value, including: if the maximum value of the three-phase voltage is less than the area voltage over-limit value, no operation is performed; if the maximum value of the three-phase voltage is greater than the area voltage over-limit value, executing: if the current adjustment power factor is not less than the inverter power factor lower limit, calculating the adjustment power factor = -current power factor*(active power factor Output-reactive step adjustment factor); if the current adjustment power factor is equal to the lower limit of the inverter power factor, calculate the adjustment active output = current active output * (active output-active step adjustment factor); if the voltage over-limit state is yes, compare the maximum value of the inverter three-phase voltage with the station area voltage over-limit value, including: if the maximum value of the three-phase voltage is greater than the station area voltage over-limit value, do not operate; if the maximum value of the three-phase voltage is less than the station area voltage over-limit value, execute: if the adjustment active output is less than the active output, calculate the adjustment active output = current active output * (active output + active step adjustment factor); if the adjustment active output is equal to the active output, calculate the power factor = -current power factor * (active output + reactive step adjustment factor); adjust the power voltage of the distributed photovoltaic according to the calculated adjustment power factor and the adjustment active output.

[0115] The present application provides a storage medium, comprising: a computer executable program stored therein, wherein the computer executable program is used to be called by a processor to execute the steps of the above-mentioned distributed photovoltaic localized power voltage regulation method.

Claims

1. A distributed photovoltaic localized power voltage regulation method, characterized in that: include: Obtain the power and voltage regulation values ​​of distributed photovoltaics, including the voltage over-limit value of the substation, the lower and upper limits of the inverter power factor, the lower limit of active output, the active step regulation factor, and the reactive step regulation factor; Set the initial state of the power regulation parameters of the distributed photovoltaic system, including: the voltage over-limit state of the substation, the inverter power factor and the active output; If the voltage over-limit state is no, the maximum value of the three-phase voltage of the inverter is compared 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, the following is performed: if the current adjustment power factor is not less than the lower limit of the inverter power factor, the adjustment power factor is calculated as -current power factor*(active power output-reactive power step adjustment factor); if the current adjustment power factor is equal to the lower limit of the inverter power factor, the adjustment active power output is calculated as current active power output*(active power output-active power step adjustment factor); If the voltage over-limit state is yes, the maximum value of the three-phase voltage of the inverter is compared 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, no operation is performed; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, the following is performed: if the adjusted active output is less than the active output, the adjusted active output is calculated as = current active output * (active output + active step adjustment factor); if the adjusted active output is equal to the active output, the power factor is calculated as = - current power factor * (active output + reactive step adjustment factor); The power voltage of the distributed photovoltaic system is adjusted according to the calculated adjusted power factor and the adjusted active output.

2. A distributed photovoltaic localized power voltage regulation method according to claim 1, characterized in that: Obtain the power and voltage regulation values ​​of distributed photovoltaics, including: The preset interface receives the over-limit value of the area voltage, the lower and upper limits of the inverter power factor, the lower limit of the active output, the active step adjustment factor and the reactive step adjustment factor input by the user.

3. According to claim 1, a distributed photovoltaic localized power voltage regulation method is characterized in that: If the adjusted active output is less than the active output, the adjusted active output = current active output * (active output + active step adjustment factor) is calculated, including: If the adjusted power factor is less than the lower limit of the inverter power factor, the adjusted power factor is set to the lower limit of the inverter power factor.

4. According to claim 1, a distributed photovoltaic localized power voltage regulation method is characterized in that: If the adjusted active output is equal to the active output, the power factor is calculated as follows: - current power factor * (active output + reactive step adjustment factor), including: If the adjusted active output is less than the active output lower limit, the adjusted active output is set to the active output lower limit.

5. According to claim 1, a distributed photovoltaic localized power voltage regulation method is characterized in that: Also includes: If the adjusted power factor is greater than the inverter power factor in the set power adjustment parameter initial state, the adjusted power factor is set to the inverter power factor in the power adjustment parameter initial state.

6. According to claim 1, a distributed photovoltaic localized power voltage regulation method is characterized in that: Regulating the power voltage of distributed photovoltaics according to the calculated regulated power factor and the regulated active output includes: The adjusted power factor and the adjusted active output are packaged as a communication message and sent to the distributed photovoltaic inverter to achieve control of the inverter.

7. A distributed photovoltaic localized power voltage regulation method according to claim 1, characterized in that: 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, including: Set the voltage over-limit status to yes.

8. A distributed photovoltaic localized power voltage regulation device, characterized in that: include: Data acquisition module, parameter setting module, processing module and communication module; The data acquisition module is used to obtain the power and voltage adjustment fixed values ​​of distributed photovoltaics, including the voltage over-limit value of the station area, the lower and upper limits of the inverter power factor, the lower limit of the active output, the active step adjustment factor and the reactive step adjustment factor; The parameter setting module is used to set the initial state of the power adjustment parameters of the distributed photovoltaic, including: the voltage over-limit state of the station area, the power factor of the inverter and the active output; The processing module is used to process: if the voltage over-limit state is no, compare the maximum value of the three-phase voltage of the inverter 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 not perform any operation; 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 adjustment power factor is not less than the lower limit of the inverter power factor, calculate the adjustment power factor = - current power factor * (active output - reactive step adjustment factor); if the current adjustment power factor is equal to the lower limit of the inverter power factor, calculate the adjustment active output = current active output * (active output - active step adjustment factor); If the voltage over-limit state is yes, the maximum value of the three-phase voltage of the inverter is compared 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, no operation is performed; if the maximum value of the three-phase voltage is less than the over-limit value of the transformer area voltage, the following is performed: if the adjusted active output is less than the active output, the adjusted active output is calculated as = current active output * (active output + active step adjustment factor); if the adjusted active output is equal to the active output, the power factor is calculated as = - current power factor * (active output + reactive step adjustment factor); The communication module is used to adjust the power voltage of the distributed photovoltaic system according to the calculated adjusted power factor and the adjusted active output.

9. A distributed photovoltaic localized power voltage regulation device according to claim 8, characterized in that: The data acquisition module, parameter setting module, processing module and communication module all realize data interaction through an internal bus.

10. A distributed photovoltaic localized power voltage regulation device according to claim 8, characterized in that: The acquisition module acquires the power voltage adjustment constant value of the distributed photovoltaic system, including: The preset interface receives the over-limit value of the area voltage, the lower and upper limits of the inverter power factor, the lower limit of the active output, the active step adjustment factor and the reactive step adjustment factor input by the user.

11. A distributed photovoltaic localized power voltage regulation device according to claim 8, characterized in that: The processing module calculates that if the adjusted active output is less than the active output, the adjusted active output=current active output*(active output+active step adjustment factor), including: If the adjusted power factor is less than the lower limit of the inverter power factor, the adjusted power factor is set to the lower limit of the inverter power factor.

12. A distributed photovoltaic localized power voltage regulation device according to claim 8, characterized in that: The processing module calculates if the adjusted active output is equal to the active output, and calculates the power factor=-current power factor*(active output+reactive step adjustment factor), including: If the adjusted active output is less than the active output lower limit, the adjusted active output is set to the active output lower limit.

13. A distributed photovoltaic localized power voltage regulation device according to claim 8, characterized in that: The processing module calculation also includes: If the adjusted power factor is greater than the inverter power factor in the set power adjustment parameter initial state, the adjusted power factor is set to the inverter power factor in the power adjustment parameter initial state.

14. A distributed photovoltaic localized power voltage regulation device according to claim 8, characterized in that: The communication module adjusts the power voltage of the distributed photovoltaic system according to the calculated adjusted power factor and the adjusted active output, including: The adjusted power factor and the adjusted active output are packaged as a communication message and sent to the distributed photovoltaic inverter to achieve control of the inverter.

15. A distributed photovoltaic localized power voltage regulation device, characterized in that: include: Memory; A processor, configured to retrieve from the memory a computer executable program of a distributed photovoltaic localized power voltage regulation method according to any one of claims 1 to 7, and execute: obtaining a power voltage regulation constant of distributed photovoltaics, including an over-limit value of a station area voltage, a lower limit and an upper limit of an inverter power factor, a lower limit of active output, an active step regulation factor, and a reactive step regulation factor; Set the initial state of the power regulation parameters of the distributed photovoltaic, including: the voltage over-limit state of the area, the inverter power factor and the active output; if the voltage over-limit state is no, compare the maximum value of the three-phase voltage of the inverter with the area voltage over-limit value, including: if the maximum value of the three-phase voltage is less than the area voltage over-limit value, do not operate; if the maximum value of the three-phase voltage is greater than the area voltage over-limit value, execute: if the current adjustment power factor is not less than the lower limit of the inverter power factor, calculate the adjustment power factor = - current power factor * (active output - reactive step adjustment factor); if the current adjustment power factor is equal to the lower limit of the inverter power factor, calculate the adjustment active output = current active output * (active output power-active step adjustment factor); if the voltage over-limit state is yes, compare the maximum value of the three-phase voltage of the inverter with the over-limit value of the substation voltage, including: if the maximum value of the three-phase voltage is greater than the over-limit value of the substation voltage, do not perform any operation; if the maximum value of the three-phase voltage is less than the over-limit value of the substation voltage, execute: if the regulated active output is less than the active output, calculate the regulated active output = current active output * (active output + active step adjustment factor); if the regulated active output is equal to the active output, calculate the power factor = -current power factor * (active output + reactive step adjustment factor); adjust the power voltage of the distributed photovoltaic according to the calculated regulated power factor and the regulated active output.

16. A storage medium, characterized in that: include: A computer executable program is stored, and the computer executable program is used to be called by a processor to execute the steps of a distributed photovoltaic localized power voltage regulation method as described in any one of claims 1 to 7.

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