Power transmission line monitoring equipment solar power supply system charging management strategy field calibration method and system

Abstract

The invention discloses a field calibration method and system for a charging management strategy of a solar power supply system of power transmission line monitoring equipment. The method comprises the following steps: acquiring and adjusting a PWM control strategy of a solar array output controller; detecting voltage and current of the photovoltaic solar array and the storage battery module and rated parameters of the storage battery to obtain field detection data; verifying and correcting the sensitivity data of the voltage and current sensors in the monitoring background of the solar power supply system according to the field detection data so as to convert the field detection data to obtain final test data; and comparing the final test data with the storage battery calibration saturation voltage, the photovoltaic panel output voltage, the system charging cut-off voltage and the storage battery maximum allowable charging voltage, performing logic judgment on the storage battery charging strategy, and completing field verification. According to the invention, on-site verification can be carried out on a solar photovoltaic power supply system of on-line monitoring equipment of a power transmission line running on site, and the method has the advantages of high efficiency, safety, simple operation and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of stability verification of solar photovoltaic power supply systems, and in particular to an on-site verification method and system for a charging management strategy of a solar power supply system of a power transmission line monitoring device. Background Art

[0002] The fundamental task of the power system is to supply electric energy "safely, reliably, with high quality and economically". However, during the operation of the power supply system, due to the effects of various factors such as electricity, heat, machinery and environment, its performance deteriorates and eventually leads to failure. The online monitoring device of the transmission line has become a very important part of the current power system. Among them, since the data acquisition terminal of the online monitoring system of the transmission line is installed on the outdoor transmission line tension tower or directly hung on the transmission line, how to reliably power the system acquisition terminal in the terminal of the online monitoring system of the transmission line is an urgent problem to be solved. The power supply provides power for each component of the system terminal and is the power "heart" of the terminal. Once the power supply system cannot supply power, the equipment will stop running. After the equipment stops running, the terminal loses the meaning of monitoring. The stability of the power supply is related to whether the system terminal can make a correct judgment after the expert system collects the data.

[0003] At present, the online monitoring system of transmission line capacity and the state inspection system of transmission line mainly adopt the combined power supply of solar cell and battery. Solar cell charges the battery when there is sunlight, and the energy required by the data acquisition terminal is provided by the battery. Therefore, the stability of solar photovoltaic power supply system is crucial to the normal operation of online monitoring system. At present, the stability verification of solar power supply system is generally carried out in the laboratory, mainly for the verification of power generation efficiency of solar photovoltaic panels, and there is no better on-site verification method for charging management strategy. Summary of the invention

[0004] The technical problem to be solved by the present invention is: In view of the problem that the existing technology cannot carry out on-site verification and stability analysis of the solar photovoltaic power supply system, a method and system for on-site verification of the charging management strategy of the solar power supply system of the transmission line monitoring equipment is provided. The method of the present invention can carry out on-site verification of the solar photovoltaic power supply system of the transmission line online monitoring equipment in operation on site, avoiding inaccurate data and unreasonable charging logic caused by long-term operation of the equipment, which ultimately affects the battery life and the power supply stability of the monitoring equipment, and has the advantages of high efficiency and simple operation.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] On the one hand, the present invention provides a method for on-site verification of a charging management strategy of a solar power system of a power transmission line monitoring device, characterized in that it includes:

[0007] 1) Obtain and adjust the PWM control strategy of the solar array output controller;

[0008] 2) Detect the voltage, current and battery rated parameters of the photovoltaic solar array and battery module to obtain on-site detection data;

[0009] 3) Verifying and correcting the voltage and current sensor sensitivity data in the solar power system monitoring background according to the field detection data, so as to convert the field detection data into final test data;

[0010] 4) By comparing the final test data with the battery calibrated saturation voltage, the photovoltaic panel output voltage, the system charging cut-off voltage, and the battery maximum allowable charging voltage, a logical judgment is made on the battery charging strategy to complete the on-site verification.

[0011] Furthermore, the on-site verification method is carried out under good sunlight during the day, and the illumination intensity during the on-site verification is not less than 400W / m 2 , the temperature is not lower than 20℃.

[0012] Furthermore, the solar array output controller in step 1) has a PWM duty cycle online adjustment function, and the voltage regulation accuracy is better than 1%.

[0013] Furthermore, the photovoltaic solar array voltage and current in step 2) are the output controller port voltage and current data, which are detected on-site by a multimeter or a calibrated standard voltage and current sensor; the battery rated parameters include the battery calibrated saturation voltage, the system charging cut-off voltage, and the battery maximum allowable charging voltage.

[0014] Further, in step 3), the sensitivity data of the voltage and current sensors in the monitoring background of the solar power system are verified and corrected according to the field detection data, specifically including: using the voltage and current sensors verified by the standard to synchronize the test with the system's own sensors, and correcting the system background data by adjusting the sensitivity parameters of the voltage and current sensors, the verification test number is not less than 2 times, and the verification correction accuracy is better than 2%. The sensitivity correction relationship of the current and voltage sensors is as follows:

[0015]

[0016] Where U c ,I c and β c ,γ c is the voltage and current value of the system background test data and the sensor sensitivity value to be corrected, U b ,I b and β b,γ b The voltage and current measurement values ​​of the standard calibration and the corrected sensor sensitivity values.

[0017] Furthermore, step 4) specifically includes: first, determining whether the voltage of the battery module has reached the battery calibrated saturation voltage. If so, verification cannot be performed and the on-site verification ends; if not, further determining whether the photovoltaic panel output voltage is greater than the maximum allowable charging voltage of the battery. If so, the photovoltaic panel output voltage needs to be adjusted by adjusting the photovoltaic panel output controller PWM duty cycle. If not, continue charging until the voltage of the battery module reaches the system charging cut-off voltage, and determine whether the system has ended charging. If so, the system battery charging management strategy is correct and the on-site verification ends; if not, modify the system charging cut-off voltage parameters, end charging, and the on-site verification ends.

[0018] A field verification system for charging management strategy of a solar power system of a power transmission line monitoring device, comprising:

[0019] A PWM control strategy verification unit, used to obtain and adjust the PWM control strategy of the solar array output controller;

[0020] A field detection data acquisition unit is used to detect the voltage, current and rated parameters of the photovoltaic solar array and the battery module to obtain field detection data;

[0021] A system parameter correction program unit is used to calibrate and correct the sensitivity parameters of the system background sensor according to the actual detection parameters, so as to convert the field detection data into the final test data;

[0022] The charging strategy on-site verification unit is used to perform logical judgment on the battery charging strategy by comparing the final test data with the battery calibrated saturation voltage, the photovoltaic panel output voltage, the system charging cut-off voltage, and the battery maximum allowable charging voltage to complete the on-site verification.

[0023] Furthermore, the system parameter correction program unit verifies and corrects the voltage and current sensor sensitivity data in the solar power system monitoring background according to the field detection data, specifically including: using the voltage and current sensors verified by the standard to synchronize the test with the system's own sensors, and correcting the system background data by adjusting the sensitivity parameters of the voltage and current sensors, the verification test number is not less than 2 times, the verification correction accuracy is better than 2%, and the current and voltage sensor sensitivity correction relationship is as follows:

[0024]

[0025] Where U c ,I c and β c ,γ cis the voltage and current value of the system background test data and the sensor sensitivity value to be corrected, U b ,I b and β b ,γ b The voltage and current measurement values ​​of the standard calibration and the corrected sensor sensitivity values.

[0026] Furthermore, the charging strategy on-site verification unit is specifically used to: first determine whether the voltage of the battery module has reached the battery calibrated saturation voltage. If so, verification cannot be performed and the on-site verification ends; if not, further determine whether the photovoltaic panel output voltage is greater than the maximum allowable charging voltage of the battery. If so, it is necessary to adjust the photovoltaic panel output voltage by adjusting the photovoltaic panel output controller PWM duty cycle. If not, continue charging until the voltage of the battery module reaches the system charging cut-off voltage, and determine whether the system has ended charging. If so, the system battery charging management strategy is correct and the on-site verification ends; if not, modify the system charging cut-off voltage parameters, end charging, and the on-site verification ends.

[0027] Compared with the prior art, the present invention mainly has the following advantages:

[0028] 1) Existing laboratory verification methods are unable to verify the charging management strategy of a solar power system in operation on site. The field verification method and system proposed in the present invention fill the gap in this field.

[0029] 2) The verification of the system background data in the on-site verification method proposed in the present invention can carry out on-site verification of the solar power supply system of the transmission line monitoring equipment in operation on site, without the need to disassemble or assemble the sensor equipment. This is simple and efficient, and can effectively avoid inaccurate data caused by long-term operation of the equipment.

[0030] 3) The charging management strategy logic judgment method proposed in the present invention can timely discover unreasonable charging logic problems on site, improve battery life and monitor the power supply stability of equipment, and has the advantages of high efficiency and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a flowchart of a method for on-site verification of a charging management strategy of a solar power system of a power transmission line monitoring device according to an embodiment of the present invention.

[0032] Figure 2 It is a schematic diagram of the framework of a field verification system for a charging management strategy of a solar power system of a power transmission line monitoring device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] like Figure 1 As shown, the present invention proposes an on-site verification method for a charging management strategy of a solar power system of a power transmission line monitoring device, comprising:

[0034] 1) Obtain and adjust the PWM control strategy of the solar array output controller;

[0035] 2) Detect the voltage, current and battery rated parameters of the photovoltaic solar array and battery module to obtain on-site detection data;

[0036] 3) Verifying and correcting the voltage and current sensor sensitivity data in the solar power system monitoring background according to the field detection data, so as to convert the field detection data into final test data;

[0037] 4) By comparing the final test data with the battery calibrated saturation voltage, the photovoltaic panel output voltage, the system charging cut-off voltage, and the battery maximum allowable charging voltage, a logical judgment is made on the battery charging strategy to complete the on-site verification.

[0038] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0039] In one embodiment of the present invention, a 110kV transmission line video monitoring online monitoring device is used as the object, and the charging strategy of the solar power supply system is verified on site when there is sunlight during the day, including the following steps:

[0040] In this embodiment, the light intensity at the verification site is 650W / m 2 , the temperature is 26℃, which meets the verification conditions. The verification conditions can be estimated by the output current-voltage equation of the solar photovoltaic array, and the relationship is as follows:

[0041]

[0042] Among them, I and V are the output current and voltage, I L is the photocurrent, which is a nonlinear function of temperature and light intensity and is obtained through testing. I0 is the reverse saturation current, α is the loss index of the circuit, Rc is the series resistance of the circuit, and R b is the parallel resistance of the circuit. According to the above relationship, the required charging current and voltage value of the energy storage battery are substituted, and it is calculated that the illumination intensity during on-site verification is not less than 400W / m 2 , the temperature is not lower than 20℃.

[0043] In this embodiment, step 1) is performed according to Figure 1 The solar photovoltaic panel controller shown in the figure adopts the maximum power point tracking (MPPT) control strategy. Figure 2 The control strategy verification program unit adjusts the output voltage and output power by adjusting the PWM duty cycle.

[0044] In this embodiment, step 2) Figure 2The solar power system parameter detection program unit uses a multimeter to detect the photovoltaic solar array output controller port voltage (19.6V), current (3.5A) and battery port voltage (18.0V), current (3.5A) on-site. The battery calibrated saturation voltage is 18.6V, the maximum allowable charging voltage is 19.0V, and the system charging cut-off voltage is 19.0V.

[0045] In this embodiment, step 3) Figure 2 The system parameter correction program unit uses the on-site detection data to verify and correct the system background data. The system background data shows that the voltage value of the photovoltaic solar array output controller port is 19.5V and the current value is 3.3A, and the voltage value of the battery port is 18.5V and the current value is 3.3A. Calculate the deviation between the voltage and current values ​​of the verification test and the voltage and current values ​​of the system background. If the voltage value deviation is less than 2%, no correction is required. The current value deviation is (3.5-3.3) / 3.5=5.7%. The current sensor sensitivity parameter needs to be corrected. The calculation formula is as follows:

[0046]

[0047] The current sensor sensitivity value to be corrected γ c =50, substitute the current value to calculate the corrected sensitivity value:

[0048]

[0049] By adjusting the sensitivity parameter value of the current sensor to 53, the system background data is corrected.

[0050] In this embodiment, step 4) is performed according to Figure 1 As shown, Figure 2 The charging strategy judgment program unit performs logical judgment. The battery voltage is 18.0V, the battery calibrated saturation voltage is 18.6V, and the battery voltage is judged to be less than the battery calibrated saturation voltage. At this time, the solar photovoltaic panel charges the battery; the photovoltaic panel output voltage is 19.6V, and the maximum allowable battery charging voltage is 19.0V. It is judged that the photovoltaic panel output voltage is greater than the maximum allowable battery charging voltage.

[0051] Therefore, press Figure 1 As shown, the photovoltaic panel output voltage needs to be adjusted by adjusting the photovoltaic panel output controller PWM duty cycle until the photovoltaic panel output voltage is less than the battery calibrated saturation voltage of 18.6V, and then the battery can continue to be charged.

[0052] Until the battery voltage reaches the system charging cut-off voltage of 19.0V, the system charging process is completed, the charging strategy is correct, and the verification is completed.

[0053] like Figure 2As shown, an embodiment of the present invention also provides a transmission line monitoring device solar power system charging management strategy on-site verification system, including:

[0054] A PWM control strategy verification unit, used to obtain and adjust the PWM control strategy of the solar array output controller;

[0055] A field detection data acquisition unit is used to detect the voltage, current and rated parameters of the photovoltaic solar array and the battery module to obtain field detection data;

[0056] A system parameter correction program unit is used to calibrate and correct the sensitivity parameters of the system background sensor according to the actual detection parameters, so as to convert the field detection data into the final test data;

[0057] The charging strategy on-site verification unit is used to perform logical judgment on the battery charging strategy by comparing the final test data with the battery calibrated saturation voltage, the photovoltaic panel output voltage, the system charging cut-off voltage, and the battery maximum allowable charging voltage to complete the on-site verification.

[0058] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for on-site verification of charging management strategy of solar power system of power transmission line monitoring equipment, characterized in that: include: 1) Obtain and adjust the PWM control strategy of the solar array output controller; 2) Detect the voltage, current and battery rated parameters of the photovoltaic solar array and battery module to obtain on-site detection data; 3) Verifying and correcting the voltage and current sensor sensitivity data in the solar power system monitoring background according to the field detection data, so as to convert the field detection data into final test data; 4) By comparing the final test data with the battery calibrated saturation voltage, the photovoltaic panel output voltage, the system charging cut-off voltage, and the battery maximum allowable charging voltage, a logical judgment is made on the battery charging strategy to complete the on-site verification.

2. According to claim 1, a method for on-site verification of charging management strategy of solar power system of power transmission line monitoring equipment is characterized in that: The on-site verification method is carried out under good sunlight during the day, and the illumination intensity during on-site verification is not less than 400W / m 2 , the temperature is not lower than 20℃.

3. According to claim 1, a method for on-site verification of charging management strategy of solar power system of power transmission line monitoring equipment is characterized in that: The solar array output controller in step 1) has a PWM duty cycle online adjustment function, and the voltage regulation accuracy is better than 1%.

4. According to claim 1, a method for on-site verification of charging management strategy of solar power system of power transmission line monitoring equipment is characterized in that: The photovoltaic solar array voltage and current described in step 2) are the output controller port voltage and current data, which are detected on-site by a multimeter or a calibrated standard voltage and current sensor; the battery rated parameters include the battery calibrated saturation voltage, the system charging cut-off voltage, and the battery maximum allowable charging voltage.

5. According to claim 1, a method for on-site verification of charging management strategy of solar power system of power transmission line monitoring equipment is characterized in that: Step 3) verifies and corrects the sensitivity data of the voltage and current sensors in the monitoring background of the solar power system according to the on-site detection data, specifically including: using the voltage and current sensors verified by the standard to synchronize the test with the system's own sensors, and correcting the system background data by adjusting the sensitivity parameters of the voltage and current sensors, the verification test number is not less than 2 times, and the verification correction accuracy is better than 2%. The sensitivity correction relationship of the current and voltage sensors is as follows: Where U c ,I c and β c ,γ c is the voltage and current value of the system background test data and the sensor sensitivity value to be corrected, U b ,I b and β b ,γ b The voltage and current measurement values ​​of the standard calibration and the corrected sensor sensitivity values.

6. A method for on-site verification of charging management strategy of solar power system of power transmission line monitoring equipment according to claim 1, characterized in that: Step 4) specifically includes: first, determine whether the voltage of the battery module reaches the battery calibrated saturation voltage. If so, verification cannot be performed and the on-site verification ends; if not, further determine whether the output voltage of the photovoltaic panel is greater than the maximum allowable charging voltage of the battery. If so, adjust the photovoltaic panel output voltage by adjusting the PWM duty cycle of the photovoltaic panel output controller. If not, continue charging until the voltage of the battery module reaches the system charging cut-off voltage, and determine whether the system ends charging. If so, the system battery charging management strategy is correct and the on-site verification ends; if not, modify the system charging cut-off voltage parameters, end charging, and the on-site verification ends.

7. A field verification system for charging management strategy of solar power system of power transmission line monitoring equipment, characterized in that: include: A PWM control strategy verification unit, used to obtain and adjust the PWM control strategy of the solar array output controller; A field detection data acquisition unit is used to detect the voltage, current and rated parameters of the photovoltaic solar array and the battery module to obtain field detection data; A system parameter correction program unit is used to calibrate and correct the sensitivity parameters of the system background sensor according to the actual detection parameters, so as to convert the field detection data into the final test data; The charging strategy on-site verification unit is used to perform logical judgment on the battery charging strategy by comparing the final test data with the battery calibrated saturation voltage, the photovoltaic panel output voltage, the system charging cut-off voltage, and the battery maximum allowable charging voltage to complete the on-site verification.

8. The transmission line monitoring equipment solar power system charging management strategy on-site verification system according to claim 7, characterized in that: The system parameter correction program unit verifies and corrects the voltage and current sensor sensitivity data in the solar power system monitoring background according to the on-site detection data, specifically including: using the voltage and current sensors verified by the standard to synchronize the test with the system's own sensors, and correcting the system background data by adjusting the sensitivity parameters of the voltage and current sensors. The verification test number is not less than 2 times, and the verification correction accuracy is better than 2%. The current and voltage sensor sensitivity correction relationship is as follows: Where U c ,I c and β c ,γ c is the voltage and current value of the system background test data and the sensor sensitivity value to be corrected, U b ,I b and β b ,γ b The voltage and current measurement values ​​of the standard calibration and the corrected sensor sensitivity values.

9. The on-site verification system for charging management strategy of solar power system for power transmission line monitoring equipment according to claim 7, characterized in that: The charging strategy on-site verification unit is specifically used to: first determine whether the voltage of the battery module has reached the battery calibration saturation voltage. If so, verification cannot be performed and the on-site verification ends; if not, further determine whether the photovoltaic panel output voltage is greater than the maximum allowable charging voltage of the battery. If so, the photovoltaic panel output voltage needs to be adjusted by adjusting the photovoltaic panel output controller PWM duty cycle. If not, continue charging until the voltage of the battery module reaches the system charging cutoff voltage. Voltage, determine whether the system has finished charging, if so, the system battery charging management strategy is correct, and the on-site verification is completed; if not, Modify the system charging cut-off voltage parameters, end charging, and complete the on-site verification.

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