From: Bob Blick <bobblick@outlook.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
Sender: "piclist-bounces@mit.edu" <piclist-bounces@mit.edu>
Date: Sat, 31 Jul 2021 12:25:23 -0700
Subject: Re: [EE]: Solar Micro Inverters
Thread-Topic: [EE]: Solar Micro Inverters
Thread-Index: AQHXhgm8y3WQvemCsE6vo73S7d5aVKtdcduE
Message-ID:
 <SJ0PR02MB766207C76B1CE52E235D00AEDCED9@SJ0PR02MB7662.namprd02.prod.outlook.com>
References:
 <CAH5-xwZrSN5GTQxjvtOHUntqOKbMXEYtjWwHyVoM5X7_tKFpKg@mail.gmail.com>
In-Reply-To:
 <CAH5-xwZrSN5GTQxjvtOHUntqOKbMXEYtjWwHyVoM5X7_tKFpKg@mail.gmail.com>
Reply-To: Microcontroller discussion list - Public. <piclist@mit.edu>
Accept-Language: en-US
Content-Language: en-US
X-MS-Exchange-Organization-SenderIdResult: Pass
X-MS-Exchange-Organization-PRD: mit.edu
X-MS-TNEF-Correlator:
acceptlanguage: en-US
received-spf: Pass (protection.outlook.com: domain of outlook.com designates
	40.92.23.23 as permitted sender) receiver=protection.outlook.com;
	client-ip=40.92.23.23;	helo=NAM12-MW2-obe.outbound.protection.outlook.com; 
dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=outlook.com;
	s=selector1;
	h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
	bh=67g2yjadWT2LeQO6wYV1dCT+hO3NvWbP9rRSeXM1L50=;
	b=BO8bNVJOFAEogac9kLToYQHjIPfHUe9gG8Z8c7ke7jtyw0TngrFzovow/k1ozrdXnq/tlSFC3H6+4JHMJj4qwsyoGYoGky0Jcjua90hy47MEhyco4PWzm9F+uNy4fLUClzHDg75jWvD874HaM2a3dtnq1cy+ki56GhgA6/p4aiOZPrJ7vdHKOQqp9UqWdSrQpnoqw9abfy/sB3h0esKw7HTTiMaUoNCygrcj4bsGDhO1LxR12GAA+ABPCmYE5U4aSr0aSGReVwzEFTdrMBtfVsnU5czcEWuN11KYvEKslgTDtDef3m4BxNHlxt41jA/be4NKQmOLpmh/QNgo9kX89A==
authentication-results: spf=pass (sender IP is 40.92.23.23)
	smtp.mailfrom=outlook.com; mit.edu; dkim=pass (signature was verified)
	header.d=outlook.com; mit.edu;	dmarc=pass action=none
 header.from=outlook.com; 
errors-to: piclist-bounces@mit.edu
list-id: "Microcontroller discussion list - Public." <piclist.mit.edu>
list-post: <mailto:piclist@mit.edu>
x-beenthere: piclist@mit.edu
x-mailman-version: 2.1.6
x-topics: [EE]
x-mime-autoconverted: from quoted-printable to 8bit by PCH.mit.edu id
	16VJPRxr028400
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

Hi Luis,
There is enough storage capacitance for a few cycles but no more. All outpu=
ts are 220/240 VAC, in parallel and connected to the power utility through =
the electrical panel. There is an aggregator that communicates to the inver=
ters through the AC line. Its job is to manage/monitor the inverters, inter=
net access, and provide information to the user. Synchronization is probabl=
y fairly basic (although simple things can be quite difficult in practice!)=
, since the job of the inverters is to provide current in phase and roughly=
 sinusoidal. I say roughly because the job of the inverter is not to force =
the utility to become a sine wave, but rather to provide current in proport=
ion to an ideal sine wave within the limits of the inverter and also the cu=
rrently available solar panel output power. Electrical safety is primarily =
handled within the inverters.
That's about all I know.
Friendly regards, Bob

________________________________________
From: piclist-bounces@mit.edu <piclist-bounces@mit.edu> on behalf of Luis M=
oreira=20
Sent: Saturday, July 31, 2021 5:32 AM
To: Microcontroller discussion list - Public.
Subject: [EE]: Solar Micro Inverters

Hi all,
Long time since posting here.

I started having a look at solar micro inverters and although I can
understand the principle of them and why you would use them, I'm failing to
find more detailed info..

Do you guys have any links for detailed descriptions for them that you
would like to share?

My immediate questions are:

- On the grid tied systems, are they all in effect connected in parallel
and with the grid directly or is there some sort of "aggregator" in place?
- do they have a short term storage device like a battery/capacitor
internally for the intermediate DC/DC converter or does it have some sort
of direct DC/DC/AC converter?
-  how does the sync circuit work? it probably needs to be faster than a
normal inverter circuit or the wasted energy while trying to lock would be
too high.

Any diagrams and algorithms would be greatly appreciated.

Thank you in advanced
Best Regards
                  Luis


--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.