Direct current system sampling and constant value accuracy automatic checking method

Abstract

The invention provides an automatic checking method for sampling and constant value accuracy of a direct current system, and particularly provides the automatic checking method for sampling and constant value accuracy of the direct current system on the basis of relevant standard requirements and in combination with the correlation between a constant value and a sampling value in operation. The sampling accuracy and the constant value setting accuracy can be automatically verified according to a specific logic relation, an alarm is given in time for abnormal conditions, and the intelligent level of direct current equipment is improved.

Description

Technical Field

[0001] The present invention relates to the field of DC system state assessment, and in particular to a method for automatically checking the accuracy of DC system sampling and setting. Background Art

[0002] At present, DC systems generally do not have the function of automatically checking sampling values ​​or fixed values. When the fixed value is set incorrectly or the sampling is abnormal, it is impossible to give an alarm in time, which affects the stable operation of the DC system. For example, (1) the fixed value is set incorrectly: suppose a DC system has 104 bottles of 2V batteries, and the floating charge voltage is set to 232V. According to relevant requirements, it should be 2.25×104=234V. At this time, the floating charge voltage of the battery is low, and the battery is undercharged. Long-term undercharging will cause the battery performance to deteriorate; (2) The sampling value drifts: if the DC monitor sampling is abnormal, the battery current sampling value is only half of the actual value. When the battery is set to charge at a constant current of 60A, the actual charging current will be 120A, causing the battery to overheat and affect charging safety. As such, the accuracy of fixed values ​​and sampling is directly related to the safe and stable operation of the DC system. It is necessary to propose an automatic calibration method for the accuracy of DC system sampling and fixed values, which can automatically and timely give an alarm when the above abnormalities occur to avoid serious consequences. Summary of the invention

[0003] The present invention provides a method for automatically checking the sampling and setting accuracy of a DC system. The method can automatically check the sampling accuracy and the setting accuracy of a set value according to a specific logical relationship, and give an alarm in time for any abnormal situation found, so as to ensure the safe and stable operation of the DC system.

[0004] In order to realize the above technical features, the object of the present invention is achieved as follows: a method for automatically checking the accuracy of DC system sampling and setting, comprising: Step 1: Establish an evaluation logic library; Step 2: Collect data; Step 3: The accuracy check of the fixed value and sampling value is abnormal; If yes, go to step 4; otherwise, go to step 2; Step 4: Output alarm.

[0005] Preferably, establishing the evaluation logic library in step 1 specifically includes: Step 1.1, determine the accuracy of the fixed value: 1) Determination of float charge voltage setting value: If: Uf=Un×1.125×N, the floating charge voltage setting value is correct; otherwise, the floating charge voltage setting value is wrong; Among them, Uf is the floating charge voltage setting value; Un is the nominal voltage of the battery; N is the number of battery bottles; 2) Determination of equalizing charging voltage setting value: If: Uv=Un×1.175×N, the equalizing charging voltage setting value is correct; otherwise, the equalizing charging voltage setting value is wrong; Among them, Uv is the setting value of the equalization charging voltage; 3) Determination of equalizing current setting value: If: Iv=0.1×C 10 , the setting value of the equalizing current is correct; otherwise, the setting value of the equalizing current is wrong; Where, Iv is the setting value of the equalizing current; C 10 is the nominal capacity of the battery; 4) Determination of the timing current setting value: If: It=0.01×C10, the timing current setting value is correct; otherwise, the timing current setting value is wrong; Among them, It is the timing current setting value; Step 1.2, sampling accuracy determination: 1) Sampling and judging of charger output voltage: a.Comparison with fixed value: Among them, the prerequisite is: Uf and Uv are set accurately, and |Ih|≤βC 10 ; If: S = "F" and |(Uz-Uf) / Uf|≥α or S = "V" and |(Uz-Uv) / Uv|≥α, the charger output voltage sampling is abnormal; Among them: α is the constant voltage accuracy, the value range is 0-1; β is the threshold coefficient, the value range is 0.001-0.01; Ih is the battery charging current; S is the state quantity; "F" is the floating charge state; Uz is the charger output voltage; "V" is the equalization charge state; b. Compare with other sampling values: If: |(Uz-Um) / Um|≥α, the charger output voltage or combined mother voltage acquisition is abnormal; If: |Ih|≤βC 10 And |(Uz-Uh) / Uh|≥α, then the charger output voltage or battery voltage or battery current collection is abnormal; Among them: Uh is the battery voltage; Um is the DC bus voltage; 2) Battery voltage sampling and judgment: a.Comparison with fixed value: Among them, the prerequisite is: Uf and Uv are set accurately, and |Ih|≤βC 10 ; If: S = "F" and |(Uh-Uf) / Uf|≥α or S = "V" and |(Uh-Uv) / Uv|≥α, the battery voltage sampling is abnormal; b. Compare with other sampling values: If: |(Uh-ΣUb|≥1V, the battery voltage acquisition is abnormal; If: Ih<-βC 10 And Uh<Uz or Ih>βC 10 And Uh>Uz, then the battery voltage or charger output voltage sampling is abnormal; Among them, Ub is the battery cell voltage; 3) Sampling and judging of charger output current: If: |Iz-Ih-Ie|≥2A, the charger output current, battery current or load current collection is abnormal; If: (|Iz-ΣId|≥1A), the charger output current collection is abnormal; Among them, Iz is the charger output current; Ie is the DC load current; Id is the single charging module output current.

[0006] Preferably, collecting data in step 2 specifically includes: Obtain the main analog quantity sampling values, fixed values, archive parameters and status quantities of the DC system; Sampling values: charger output voltage Uz, charger output current Iz, battery voltage Uh, battery charging current Ih, DC load current Ie, DC bus voltage Um, charging module single output current Id, battery single voltage Ub; Fixed value: floating charge voltage setting value Uf, equalizing charge voltage setting value Uv, equalizing charge current setting value Iv, timing current setting value It; File parameters: battery nominal voltage Un, battery nominal capacity C 10 , Number of battery bottles N; State quantity S: V for equalizing charge, F for floating charge, and D for discharging.

[0007] Preferably, step 3 specifically includes: evaluating and analyzing the accuracy of sampling and setting values ​​in real time according to the logical relationship library listed in step 1, and giving an alarm for abnormal situations to avoid equipment damage caused by incorrect setting of setting values ​​or inaccurate sampling, thereby ensuring safe and stable operation of the DC system.

[0008] Beneficial effects of the present invention: 1. Based on the requirements of relevant standards and combined with the correlation between the set value and the sampled value during operation, the present invention proposes a method for automatically checking the accuracy of DC system sampling and set value setting, which can automatically check the sampling accuracy and the accuracy of set value setting according to specific logical relationships, and give timely alarms for abnormal situations, thereby improving the intelligence level of DC equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0010] Figure 1 It is a flowchart of the present invention. DETAILED DESCRIPTION

[0011] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0012] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0013] Embodiment 1: See also Figure 1 ,Step 1: Build an evaluation logic library; Step 1.1, determine the accuracy of the fixed value: 1) Determination of float charge voltage setting value: If: Uf=Un×1.125×N, the floating charge voltage setting value is correct; otherwise, the floating charge voltage setting value is wrong; Among them, Uf is the floating charge voltage setting value; Un is the nominal voltage of the battery; N is the number of battery bottles; 2) Determination of equalizing charging voltage setting value: If: Uv=Un×1.175×N, the equalizing charging voltage setting value is correct; otherwise, the equalizing charging voltage setting value is wrong; Among them, Uv is the setting value of the equalization charging voltage; 3) Determination of equalizing current setting value: If: Iv=0.1×C 10 , the setting value of the equalizing current is correct; otherwise, the setting value of the equalizing current is wrong; Where, Iv is the setting value of the equalizing current; C 10 is the nominal capacity of the battery; 4) Determination of the timing current setting value: If: It=0.01×C10, the timing current setting value is correct; otherwise, the timing current setting value is wrong; Among them, It is the timing current setting value; Step 1.2, sampling accuracy determination: 1) Sampling and judging of charger output voltage: a.Comparison with fixed value: Among them, the prerequisite is: Uf and Uv are set accurately, and |Ih|≤βC 10 ; If: S = "F" and |(Uz-Uf) / Uf|≥α or S = "V" and |(Uz-Uv) / Uv|≥α, the charger output voltage sampling is abnormal; Among them: α is the constant voltage accuracy, the value range is 0-1; β is the threshold coefficient, the value range is 0.001-0.01; Ih is the battery charging current; S is the state quantity; "F" is the floating charge state; Uz is the charger output voltage; "V" is the equalization charge state; b. Compare with other sampling values: If: |(Uz-Um) / Um|≥α, the charger output voltage or combined mother voltage acquisition is abnormal; If: |Ih|≤βC 10 And |(Uz-Uh) / Uh|≥α, then the charger output voltage or battery voltage or battery current collection is abnormal; Among them: Uh is the battery voltage; Um is the DC bus voltage; 2) Battery voltage sampling and judgment: a.Comparison with fixed value: Among them, the prerequisite is: Uf and Uv are set accurately, and |Ih|≤βC 10 ; If: S = "F" and |(Uh-Uf) / Uf|≥α or S = "V" and |(Uh-Uv) / Uv|≥α, the battery voltage sampling is abnormal; b. Compare with other sampling values: If: |(Uh-ΣUb|≥1V, the battery voltage acquisition is abnormal; If: Ih<-βC 10 And Uh<Uz or Ih>βC 10 And Uh>Uz, then the battery voltage or charger output voltage sampling is abnormal; Among them, Ub is the battery cell voltage; 3) Sampling and judging of charger output current: If: |Iz-Ih-Ie|≥2A, the charger output current, battery current or load current collection is abnormal; If: (|Iz-ΣId|≥1A), the charger output current collection is abnormal; Among them, Iz is the charger output current; Ie is the DC load current; Id is the single charging module output current.

[0014] Step 2: Collect data; Obtain the main analog quantity sampling values, fixed values, archive parameters and status quantities of the DC system; Sampling values: charger output voltage Uz, charger output current Iz, battery voltage Uh, battery charging current Ih, DC load current Ie, DC bus voltage Um, charging module single output current Id, battery single voltage Ub; Fixed value: floating charge voltage setting value Uf, equalizing charge voltage setting value Uv, equalizing charge current setting value Iv, timing current setting value It; File parameters: battery nominal voltage Un, battery nominal capacity C 10 , Number of battery bottles N; State quantity S: V for equalizing charge, F for floating charge, and D for discharging.

[0015] Step 3: The accuracy check of the fixed value and sampling value is abnormal; According to the logic relationship library listed in step 1, the accuracy of sampling and setting is evaluated and analyzed in real time, and alarms are issued for abnormal situations to avoid equipment damage caused by incorrect setting of setting values ​​or inaccurate sampling, thereby ensuring safe and stable operation of the DC system.

[0016] Step 4: Output alarm.

[0017] Embodiment 2: The present invention provides a method for automatically checking the accuracy of DC system sampling and setting value: Step 1: Create a logical relationship library: ① Judgment of the accuracy of fixed value: 1) Determination of float charge voltage setting value: if (Uf = Un × 1.125 × N) The float charge voltage setting value is correct; else The float charge voltage setting value is incorrect.

[0018] 2) Determination of equalizing charging voltage setting value: if (Uv = Un × 1.175 × N) The setting value of the equalizing charging voltage is correct; else The equalizing charging voltage setting value is incorrect.

[0019] 3) Determination of equalizing current setting value: if (Iv=0.1×C10) The setting value of the equalizing charging current is correct; else The equalization current setting value is incorrect.

[0020] 4) Determination of the timing current setting value: if (It = 0.01 × C10) The timing current setting value is correct; else The timing current setting value is wrong.

[0021] ② Determination of sampling accuracy: 1) Sampling and judging of charger output voltage: a. Compare with the set value (precondition: Uf and Uv are set accurately and |Ih|≤βC10); if(S=“F”&|(Uz-Uf) / Uf|≥α||S=“V”&|(Uz-Uv) / Uv|≥α) The charger output voltage sampling is abnormal; (Note: α is the constant pressure accuracy, the value range is 0-1, and 0.005 is recommended here; β is the threshold coefficient, the value range is 0.001-0.01, and 0.005 is recommended here) b. Compare with other sampling values if (|(Uz-Um) / Um|≥α) The charger output voltage or combined voltage collection is abnormal; If(|Ih|≤1A&|(Uz-Uh) / Uh|≥α) The charger output voltage, battery voltage or battery current collection is abnormal; 2) Battery voltage sampling and judgment a. Compare with the set value (precondition: Uf and Uv are set accurately and |Ih|≤βC10) if(S=“F”&|(Uh-Uf) / Uf|≥α||S=“V”&|(Uh-Uv) / Uv|≥α ) The battery voltage sampling is abnormal; b. Compare with other sampling values if (|(Uh-ΣUb|≥1V) The battery voltage collection is abnormal; If (Ih<-0βC 10 &Uh<Uz||Ih>βC 10 &Uh>Uz) The battery voltage or charger output voltage sampling is abnormal; 3) Sampling and judging of charger output current If (|Iz-Ih-Ie|≥2A) The charger output current, battery current or load current collection is abnormal; If (|Iz-ΣId|≥1A) The charger output current collection is abnormal; Step 2: Obtain the sampling values, fixed values, archive parameters and state quantities of the main analog quantities of the DC system. Sampling values: charger output voltage Uz, charger output current Iz, battery voltage Uh, battery charging current Ih, DC load current Ie, DC bus voltage Um, charging module single output current Id, battery single voltage Ub; fixed values: floating charge voltage setting value Uf, equalizing charge voltage setting value Uv, equalizing charge current setting value Iv, timing current setting value It; archive parameters: battery nominal voltage Un, battery nominal capacity C 10 , number of battery bottles N; state quantity S: equalization charge (V), floating charge (F), discharge (D).

[0022] Step 3: Evaluate and analyze the accuracy of sampling and setting values ​​in real time based on the logical relationship library listed in step 1, and issue alarms for abnormal situations to avoid equipment damage caused by incorrect setting of setting values ​​or inaccurate sampling, thereby ensuring safe and stable operation of the DC system.

Claims

1. A method for automatically checking the accuracy of DC system sampling and setting, characterized in that: include: Step 1: Establish an evaluation logic library; Step 2: Collect data; Step 3: The accuracy check of the fixed value and sampling value is abnormal; If yes, go to step 4; otherwise, go to step 2; Step 4: Output alarm.

2. According to claim 1, a method for automatically checking the accuracy of DC system sampling and setting, characterized in that: The establishment of the evaluation logic library in step 1 specifically includes: Step 1.1, determine the accuracy of the fixed value: 1) Determination of float charge voltage setting value: If: Uf=Un×1.125×N, the floating charge voltage setting value is correct; otherwise, the floating charge voltage setting value is wrong; Among them, Uf is the floating charge voltage setting value; Un is the nominal voltage of the battery; N is the number of battery bottles; 2) Determination of equalizing charging voltage setting value: If: Uv=Un×1.175×N, the equalizing charging voltage setting value is correct; otherwise, the equalizing charging voltage setting value is wrong; Among them, Uv is the setting value of the equalization charging voltage; 3) Determination of equalizing current setting value: If: Iv=0.1×C 10 , the setting value of the equalizing current is correct; otherwise, the setting value of the equalizing current is wrong; Where, Iv is the setting value of the equalizing current; C 10 is the nominal capacity of the battery; 4) Determination of the timing current setting value: If: It=0.01×C10, the timing current setting value is correct; otherwise, the timing current setting value is wrong; Among them, It is the timing current setting value; Step 1.2, sampling accuracy determination: 1) Sampling and judging of charger output voltage: a.Comparison with fixed value: Among them, the prerequisite is: Uf and Uv are set accurately, and |Ih|≤βC 10 ; If: S="F" and |(Uz-Uf) / Uf|≥α or S="V" and |(Uz-Uv) / Uv|≥α, the charger output voltage sampling is abnormal; Among them: α is the constant voltage accuracy, the value range is 0-1; β is the threshold coefficient, the value range is 0.001-0.01; Ih is the battery charging current; S is the state quantity; "F" is the floating charge state; Uz is the charger output voltage; "V" is the equalization charge state; b. Compare with other sampling values: If: |(Uz-Um) / Um|≥α, the charger output voltage or combined mother voltage acquisition is abnormal; If: |Ih|≤βC 10 And |(Uz-Uh) / Uh|≥α, then the charger output voltage or battery voltage or battery current collection is abnormal; Among them: Uh is the battery voltage; Um is the DC bus voltage; 2) Battery voltage sampling and judgment: a.Comparison with fixed value: Among them, the prerequisite is: Uf and Uv are set accurately, and |Ih|≤βC 10 ; If: S="F" and |(Uh-Uf) / Uf|≥α or S="V" and |(Uh-Uv) / Uv|≥α, the battery voltage sampling is abnormal; b. Compare with other sampling values: If: |(Uh-ΣUb|≥1V, the battery voltage acquisition is abnormal; If: Ih<-βC 10 And Uh<Uz or Ih>βC 10 And Uh>Uz, then the battery voltage or charger output voltage sampling is abnormal; Among them, Ub is the battery cell voltage; 3) Sampling and judging of charger output current: If: |Iz-Ih-Ie|≥2A, the charger output current, battery current or load current collection is abnormal; If: (|Iz-ΣId|≥1A), the charger output current collection is abnormal; Among them, Iz is the charger output current; Ie is the DC load current; Id is the single charging module output current.

3. According to claim 1, a method for automatically checking the accuracy of DC system sampling and setting, characterized in that: The data collected in step 2 specifically include: Obtain the main analog quantity sampling values, fixed values, archive parameters and status quantities of the DC system; Sampling values: charger output voltage Uz, charger output current Iz, battery voltage Uh, battery charging current Ih, DC load current Ie, DC bus voltage Um, charging module single output current Id, battery single voltage Ub; Fixed value: floating charge voltage setting value Uf, equalizing charge voltage setting value Uv, equalizing charge current setting value Iv, timing current setting value It; File parameters: battery nominal voltage Un, battery nominal capacity C 10 , Number of battery bottles N; State quantity S: V for equalizing charge, F for floating charge, and D for discharging.

4. According to claim 1, a method for automatically checking the accuracy of DC system sampling and setting, characterized in that: Step 3 specifically includes: evaluating and analyzing the accuracy of sampling and setting values ​​in real time according to the logical relationship library listed in step 1, giving alarms for abnormal situations, avoiding equipment damage caused by incorrect setting of setting values ​​or inaccurate sampling, and ensuring safe and stable operation of the DC system.

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