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Changes for page 3.3 Control

Last modified by Admin on 2025/04/09 12:14
From version 6.2
edited by Admin
on 2024/12/24 15:42
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To version 10.7
edited by Admin
on 2024/12/24 16:26
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18 18  * Relax time (atfer discharging) – a relaxation time after discharging, second;
19 19  * Reset parameters – a command to reset cells state of charge, capacity, and resistance;
20 20  * Method of calculating the battery voltage:
21 -** Summa
21 +** Summation of cell voltages – the overall voltage is calculated as on sum of all cells in the battery;
22 +** Using voltage before contactors – the overall voltage is estimated as voltage before contactors measured by BMS.
22 22  
23 23  The values “Capacity”, “Resistance”, “Cycles” are used to calculate the SOC of cells and the battery.
24 24  
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43 43  
44 44  To change the estimation algorithm for calculating the battery SOC, select the "Control → SOC estimation → Algorithm" section:
45 45  
46 -[[image:1733322611549-423.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="148" width="800"]]
47 47  
48 +[[image:1735056107942-306.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="141" width="800"]]
49 +
48 48  The following estimation algorithms supported:
49 49  
50 50  * Voltage – by open circuit voltage;
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68 68  
69 69  * Minimal SOC – the battery SOC is assumed to be the minimum SOC among the cells;
70 70  * Average SOC – the battery SOC is taken equal to the arithmetic average of the cell SOC;
71 -* Min-Max SOC – the battery SOC is taken based on the minimum and maximum SOC of the cells (recommended method).
73 +* Min-Max SOC – the battery SOC is calculated based on the minimum and maximum SOC of the cells. Final SOC will be a) 100% if any cell have 100% SOC, b) 0% if any cell have 0% SOC;
74 +* Max-Min SOC – the battery SOC is calculated based on the minimum and maximum SOC of the cells. Final SOC will be a) 100% if all cells have 100% SOC, b) 0% if all cells have 0% SOC;
72 72  
73 73  Other parameters:
74 74  
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103 103  
104 104  Calculation of the resistance of cells is carried out in two ways. The first method is used when the battery passes from a relaxation state to a charge or discharge state, wherein the cell resistance value
105 105  
106 -R = (U-U,,ocv,,) / I,,stable,,,
109 +{{formula fontSize="SMALL" imageType="PNG"}}
110 +R = \frac{U-U_{ocv}}{I_{stable}}
111 +{{/formula}}
107 107  
108 -where U is the cell voltage measured in the charge or discharge state, V; U,,ocv,, is the cell voltage measured in the state of relaxation (before switching to the state of charge or discharge); I,,stable,, – stabilized current through the cell in the state of charge or discharge.
113 +where U — the cell voltage measured in the charge or discharge state, V; U,,ocv,, — cell voltage measured in the state of relaxation (before switching to the state of charge or discharge); I,,stable,, — stabilized current through the cell in the state of charge or discharge.
109 109  
110 110  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
111 111  
112 -R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
117 +{{formula fontSize="SMALL"}}
118 +R = \frac{U_2-U_1}{I_{stable2}-I_{stable1}}
119 +{{/formula}}
113 113  
114 -(Q,,max,, is the maximum cell capacity),
121 +provided that
115 115  
116 -where U,,2,, is the voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, – the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.
123 +{{formula fontSize="SMALL"}}
124 +| I_{stable2}-I_{stable1} | > 0.2 × Qmax
125 +{{/formula}}
117 117  
127 +where Q,,max,, — the maximum cell capacity,U,,2,, — voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, — the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.
128 +
118 118  The stabilized current I,,stable,, = I, if during the stabilization time the instantaneous current I is in the range from 0.95 × I to 1.05 × I.
119 119  
120 120  To change parameters of the algorithm for calculating the cell resistance, select the "Control → Resistance estimation" section:
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129 129  * Minimum SOC – minimum cell SOC value for resistance calculation;
130 130  * Maximum SOC – maximum cell SOC value for resistance calculation.
131 131  
132 -The calculated resistance is accepted by the system as valid (and therefore updated) if its value is in the range from Resistance/2 to “Maximum resistance factor” × Resistance, where "Resistance" is the nominal resistance of the cell (see [[Common settings>>doc:||anchor="HCommonsettings"]]). If the calculated resistance value is greater than the value (Maximum resistance factor × Resistance), the updated resistance value will be equal to the value (Maximum resistance factor × Resistance).
143 +The calculated resistance is accepted by the system as valid (and therefore updated) if its value is in the range from Resistance / 2 to “Maximum resistance factor” × Resistance, where "Resistance" is the nominal resistance of the cell (see [[Common settings>>doc:||anchor="HCommonsettings"]]). If the calculated resistance value is greater than the value (Maximum resistance factor × Resistance), the updated resistance value will be equal to the value (Maximum resistance factor × Resistance).
133 133  
134 134  === Low SOC (signal) ===
135 135  
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