図2

図5

図6

図7

図8

PV panel

Isolated operation

output

Isolated operation

output

Utility power

Utility grid

Received

power

10 kW power conditioner

Junction

box

Junction

box

Junction

box

Junction

box

Equipment

used during

power outages

Utility power

Equipment

used during

power outages

Isolated operation

output

Utility power

Equipment

used during

power outages

Isolated operation

output

Utility power

Equipment

used during

power outages

Isolated

operation

output

Utility power

Equipment

used during

power outages

General

equipment

Utility grid

General

equipment

Power

transducer

Received

power

Power

transducer

Utility grid

General

equipment

Received

power

Power

transducer

Utility grid

General

equipment

Received

power

Power

transducer

Utility grid

General

equipment

Received

power

Power

transducer

Battery

PV panel

Junction

box

Junction

box

Battery

PV panel

Junction

box

Junction

box

attery

PV panel

Junction

box

Junction

box

Battery

I/O box

Inverter

AC filter

Utility

protective

device

Utility

protective

device

Utility

protective

device

Utility

protective

device

10 kW power conditioner

I/O box

10 kW power conditioner

I/O box

10 kW power conditioner

10 kW power

conditioner

Inverter

AC filter

Utility

protective

device

Utility

protective

device

Inverter

AC filter

Utility

protective

device

Utility

protective

device

Inverter

AC filter

Utility

protective

device

Utility

protective

device

28SANYO DENKI Technical Report No.36 Nov. 2013

New Products Introduction

Tetsuya Fujimaki Akinori Matsuzaki Katsutoshi Yamanaka Naohiko Shiokawa

1. Introduction

Since the Great East Japan Earthquake, there has been

an increase in the number of local councils considering

installing backup power and demand from private industry

in order to prepare for long-term power outages in the event

of disasters. Among this, disaster prevention photovoltaic

power generation systems consisting of photovoltaic

batteries and storage batteries have gained at

tention as

backup power sources that use natural energy and yet can

be used as stand-alone power sources during a disaster.

Sanyo Denki has been selling the “SANUPS PMC-TD”

series, which is a disaster prevention photovoltaic power

generation system consisting of photovoltaic batteries and

storage batteries, for some time now. The “SANUPS PMC-

TD” series is highly regarded by the market and consists

of a

lineup with grid-connected operation and isolated operation

functions, isolated operation and charging operation

functions and peak-cut function.

This time, we have enhanced the lineup by developing

a model which incorporates a lithium ion battery on the

models with isolated operation and charging operation

functions and peak-cut function. Comp ared with

conventional lead batteries, lithium i

on batteries have

longer life and a high energy density, therefore achieving

longer life systems which are both smaller and lighter.

This document provides an overview of the features of the

“SANUPS PMC-TD” power conditioner with a lithium ion

battery.

2. Overview of the

“

SANUPS PMC-TD

”

The “SANUPS PMC-TD” consists of a 10 kW power

conditioner unit and an I/O box, and it is a build-up system

that ca

n stack up to ﬁve 10 kW power conditioner units. The

lineup includes models with system capacities ranging from

10 to 50 kW.

Fig. 1 shows the “SANUPS PMC-TD” (50 kW) and Fig. 2

shows the basic circuit architecture.

The power conditioner unit has an isolated operation

output circuit and a charge circuit to the storage battery,

enabling it to supply power to isolated operation output if

the electrical

utility grid goes down.

The I/O box has a storage battery input switch, a power

conditioner output switch, and an isolated operation output

bypass switch. Switching between operation modes and

turning the output circuit on and off causes the power

supplies to switchover.

Fig. 1: A photo of “SANUPS PMC-TD” (50 kW)

Fig. 2: Basic circuit architecture of

“SANUPS PMC-TD”

Development of Power Conditioner

with a Lithium Ion Battery

“

SANUPS PMC-TD

”

PV panel

Lithium ion battery panel

PMC-TD

Equipment used during

power outages

Power transducer

Monitor

display unit

LiB status information/

measuring information RS-485

PCS status information/

measuring information RS-485

Received power measurement

value 4 - 20 mA

General equipment

Utility power

Auxiliary power 200 V AC/2 A

LiB interface

29 SANYO DENKI Technical Report No.36 Nov. 2013

“

SANUPS PMC-TD

”

Operation Mode

The “SANUPS PMC-TD” series has four operation

modes: “grid-connected operation”, “peak-cut operation”,

“isolated operation” and “charging operation” .

This chapter provides an overview of the operation of

each operation mode and the protection operation of each

operation mode in the event that a battery fault is detected.

4.1 Grid-connected operation mode

Grid-connected operation is executed when all the

following conditions are met. Fig .5 shows the ﬂow of power

during grid-connected operation.

・Power generated from the PV panels is above a certain

amount

・Utility grid is normal

During grid-connected operation, the power conditioner

tracks maximum power points and supplies AC power to

the electrical utility grid depending on the power generated

from the PV pane

ls. If the power generated from the PV

panels is more than the power consumption of the general

equipment, the surplus power is fed back to the electrical

utility grid.

The utility power is supplied to the equipment used during

power outages via the bypass circuit, as well as the general

equipment.

If a battery fault occurs during grid-connected operation,

grid-connected operation will continue.

Fig. 3: A photo of the lithium ion battery panel

Fig. 4: Basic conﬁguration when lithium ion battery

is equipped

Table 1: Outline of battery panel

Item Speciﬁcations

Battery capacity

(nominal)

23 kWh

Rated voltage 310.8 V

Dimensions

W: 1100 mm

D: 700 mm

H: 2075 mm (including protruding objects)

Protection function

(Outgoing signals)

Overcharge

Over-discharge

Battery temperature fault

Cell controller failure

BCU failure

3. Features

of the Lithium Ion Battery Model

Compared with lead batteries, lithium ion batteries have

high energy density, meaning that energy can be extracted

efﬁciently. As such, if a battery of equal capacity is equipped,

lithium ion batteries make downsizing, weight-saving and

space-saving possible. Moreover, the charge/discharge

cycle of lithium ion batteries is long, therefore they are

advan

tageous in applications such as isolated, charging and

peak-cut operation in which charge/discharge are repeated

and offer longer life than lead batteries.

Fig. 3 is a photo of the lithium ion battery panel. A

protection function is required for lithium ion batteries to

protect the safety of the battery and power system when

a battery fault, such as overcharging and overdischarging,

occurs. Table 1

gives an outline of the battery panel and a

description of the protection function. If a battery fault is

detected, the power conditioner disconnects the battery

to protect it. Fig. 4 shows the system conﬁguration when a

lithium ion battery is equipped.