Differences

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--- manual:pws2-30k:droop_mode_precautions [2021/06/17 02:20]
ran_gao
+++ manual:pws2-30k:droop_mode_precautions [2022/04/05 05:12] (current)
chloe [Side effects]
@@ Line 1: / Line 1: @@
 ====== Droop mode precautions ======
+<WRAP center round warning 60%>
+Warning
+Droop control mode is still an experimental functionality, the performance depends.
+</WRAP>
 ===== Scope =====
   * Since firmware D141, droop mode has been added to PWS2-30K/M, to provide a non-communication off-grid parallel operation solution.
-  * Only 3-phase PWS2-30K/M supports droop mode, single phase firmware does NOT support droop mode yet.
+  * Single phase firmware can supports three sets of inverters droop mode yet.
 ===== To enable droop mode =====
   * To write register 750(0x02EE) and 756(0x02F4), authorization must be granted first, by writing 2007 to register 4007(0x0FA7) and 2016 to register 4008(0x0FA8).
   * The PWS2-30K must be set to 3P3W, 750(0x02EE)= 1; and** NO neutral line connected**
   * To enable droop mode, set register 756(0x02F4) to 1
-  * After enabling droop mode, <HTML><strike>a hard reboot is required.</strike></HTML>, write 1 to register 657(0x0291) to reboot the software.
+  * After enabling droop mode, <del>a hard reboot is required.</del>, write 1 to register 657(0x0291) to reboot the software. make sure the inverter is not running at this moment.
 ===== Requirements =====
   * A delta-wye transformer is required if 277V or 220V single phase load is required.
   * When multiple PWS2-30K/M are used for off-grid droop parallel operation, there must be one PWS2-30K establishing AC voltage first, and then the others can be started.
-  * The maximum quantity of PWS2-30K/M for off-grid droop parallel operation in one microgrid is 9 units
+  * The maximum quantity of PWS2-30K/M verified to be working for off-grid droop parallel operation in one microgrid is 9 units (because we can only obtain 9 units in the lab)
   * When droop parallel operation implemented, the length of the cables from the PWS2-30K/M should be as same as possible.
@@ Line 18: / Line 26: @@
   * The droop mode will bring voltage and frequency fluctuation (90%~110%)
   * The droop mode will bring some circulating current between each PWS2-30K/M, if the load is low in off-grid microgrid, the currents of each DC side of the PWS2-30K will be fluctuating not more than of ±5%
-  * **If droop mode is enabled in grid-tied mode, there will be some unpredictable reactive power, DISABLE droop mode if it's not necessary for the grid-tied operation.
-**