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--- how_to:dc_dispatch_and_ac_dispatch [2019/05/20 02:24]
admin created
+++ how_to:dc_dispatch_and_ac_dispatch [2020/09/16 21:42] (current)
@@ Line 1: / Line 1: @@
 ====== Select DC dispatch or AC dispatch ======
 Sinexcel PCS supports DC dispatch and AC dispatch
-  * DC dispatch
+===== What is DC dispatch and AC dispatch =====
-  * AC dispatch
+An inverter is a bi-port network, it has two ports, DC and AC. In theory, the AC power equals to DC power, if there's no self consumption.
+But actually, there is an efficiency issue. We have the following equtions
+In Charging
+$$P_{DC}=P_{AC}\times \eta _{charge}$$
+In Discharging
+$$P_{AC}=P_{DC}\times \eta _{discharge}$$
+Once one of $P_{DC}$ and $P_{AC}$ is designated, the other one is determined.
+Depending on the designated port, there is AC dispatching mode and DC dispatching mode
+===== AC dispatch=====
+In AC dispatch mode,
+You can
+  * designate AC active power (total, but NOT each string for multi-string version)
+  * designate AC reactive power
+  * activate PF-P, Volt-VAr, Freq-Watt, Volt-Watt
+You can NOT
+  * designate DC power
+  * designate DC current
+===== String dispatch=====
+String dispatch mode is kind of AC dispatching for multi-string PCS,
+You can
+  * designate AC active power** of each string for multi-string version**, but NOT total power
+  * designate AC reactive power in total  (total, but not each string for multi-string version)
+  * activate PF-P, Volt-VAr, Freq-Watt, Volt-Watt
+You can NOT
+  * designate DC power
+  * nor designate DC current
+===== DC dispatch=====
+In DC dispatch mode,
+You can
+  * designate DC power but not DC current (of each string for multi-string version)
+  * or designate DC current but not DC power (of each string for multi-string version)
+You can NOT
+  * designate AC active power
+  * designate AC reactive power
+  * activate PF-P, Volt-VAr, Freq-Watt, Volt-Watt