光伏离网并网逆变器解决方案

本套逆变器方案DC-DC采用Boost升压，DCAC采用单相全桥逆变电路结构。以TI公司的浮点数字信号控制器TMS320F28335DSP为控制电路处理器，采用规则采样法和DSP片内ePWM模块功能实现PWM和SPWM波。PV最大功率点跟踪（MPPT）采用了恒压跟踪法（CVT法）来实现，并用软件锁相环进行系统的同频、同相控制，控制灵活简单。方案本身包含原理图，PCB(Protel打开），源程序代码（CCS打开），BOM清单。

硬件方案--电源板底板

硬件方案底板主要包含各种接口，包括RS232接口，PWM接口，输出并网继电器接口，按键，LCD及开关量输出，RS485接口，LED，JTAG下载接口，CAN总线接口，核心板接口，蜂鸣器以及DAC接口等。2层板，已经覆铜，以下展示部分BOM。

Comment	Description	Designator
SW-PB	Switch	B1, B2, B3, B4
104	Capacitor	C1, C2, C3, C4, C6, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C48
332	Capacitor	C25, C26, C27, C28, C29, C30, C31, C32, C33, C34, C35, C36, C37, C38, C39, C40
105	Capacitor	C41, C42
10uF/16V	Bi-Polar Capacitor, Polarized Capacitor (Radial)	C43, C44, C45
331	Capacitor	C46, C47
LED		D1, D2, D3, D4, D5
1N4007	Diode	D6
ADCA	Connector	J1
ADCB	Connector	J2
ST7920-12864		J3
JUMP	Connector	J4
JQ	Connector	J5
DAC	Connector	J6
POWER		J7
JUMP	Connector	J10
RS485	Connector	J11
CAN	Connector	J12
NETCON		J15
SPI	Connector	J16
COM	Connector	J17
JTAG	Header, 7-Pin, Dual row	JG1
IDC80		JP1, JP2
HRS2H-S-DC5V		K1
10uH	Inductor	L1, L2, L3
7SEG		LD1, LD2, LD3
Bell	Electrical Bell	LS1
RS232_B	Header, 4-Pin	P1
DRIVER	Connector	P2
MMBT2222A	NPN Transistor	Q1, Q2
102		R1, R2, R4, R8, R9, R10, R13, R21, R22
103		R3, R5, R6, R7, R11, R12
101		R14, R16, R17
201		R15
121		R18, R19
512		R20
0		R23, R24, R25
102*4		RP1, RP2, RP3, RP4, RP5, RP6
RS232_A	Receptacle Assembly, 9 Position, Right Angle	RS1
SW-DT	Connector	SW1
LM358	Fast Settling Dual Operational Amplifier	U1, U2, U3, U4
TLV5620		U9
REF3020		U10
LM1117-3.3		U11
MAX3232A	+5V Powered, Multi-Channel RS-232 Driver/Receiver	U12
MAX485		U13
SN65HVD235		U14
SN74HC164	8-Bit Shift Register with 3-State Output Registers	U15, U16, U17
74LVXC3245		U18

硬件方案--采样驱动隔离板

采样驱动板包括ACDX SPWM驱动部分，比较器LM393，MOS驱动ICIR2100，光耦6N137，LDO 78M15和78M05。此外还包含输出电压及输出电流检测部分，市电过零比较，直流输入电流检测等功能电路。PCB是2层板，以下展示部分BOM。

Comment	Description	Designator
470uF/25V		C1
470uF/35V	Bi-Polar Capacitor	C3
104	[NoValue], Capacitor	C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C51, C52
10uF/25V	Capacitor	C29, C30, C31, C32, C33, C34, C35, C36, C37, C38
15p	Capacitor	C39, C40
47uF/16VD	Polarized Capacitor (Radial)	C41
103	[NoValue], Capacitor	C42, C46, C47, C53, C54
100uF/25V	Bi-Polar Capacitor	C43
10uF/25VD	Capacitor	C44, C45
470uF/25V	Bi-Polar Capacitor	C48, C49
331	Capacitor	C50
101	Capacitor	C55, C56, C57
332	Capacitor	C58
LED		D2
UF4007	Diode	D3, D4
DC2405D-1W		DC1
POWER	Connector	J1
10uH	Inductor	L1, L2
MAIN	Connector	P1
DCAC	Connector	P2
5H11G	PNP General Purpose Amplifier	Q1
4H11G	NPN General Purpose Amplifier	Q2
471		R1, R2, R3
101		R4, R5, R34
100		R6, R7
472		R8, R9, R33
102		R10, R11, R12, R13, R18

硬件方案--逆变板

逆变板主要是高压电路大电流电路，包括MOSFETFSW25N50A，电流传感器ACS712-05B，比较器LM358，光耦HCNR200，EMI及并网电路。PCB是2层板，可以看到基本都是大面积铺铜来实现连通，以下展示部分BOM。

Comment	Description	Designator
47uF/50V	Electrolytic Capacitor	C1
100uF/450V	Bi-Polar Capacitor	C2
105/630V	Capacitor	C3, C4
104	[NoValue], Capacitor	C5, C6, C14, C15
103		C7, C8
102	Capacitor	C9, C10
470uF/250V	Bi-Polar Capacitor	C11, C12
224/630V	Capacitor	C13
475/630V		C16
104/630V	Capacitor, [NoValue]	C17, C18, C21
472/250V		C19, C20
MUR1560	Diode	D1
LED		D2
1N4007	Diode	D3
LED		D4
1N4148	Diode	D5, D6, D7, D8
FUSE	Fuse	F1
JUMP	Connector	JP1, JP3, JP4
PV	Connector	JP2
ACOUT	Connector	JP5
TRA2L-24VDC		K1
TS	Inductor	KT1
1mH	Inductor	L1
2.5mH	Inductor	L2, L3
DCAC	Connector	P1
FSW25N50A		Q1, Q2, Q3, Q4, Q5
MMBT2222A	NPN Transistor	Q6
914		R1, R2
10R		R3, R4, R5, R6, R7
473		R8, R9, R10
201		R11
330K/1W		R12

硬件方案--主控板

主控板主要是主控的最小系统电路，包括了TI的DPS TMS320F28035 80pin的封装，外部512K存储器AT24C512，JTAG下载接口，复位及BOOT电路。PCB是2层板，已经覆铜，以下展示部分BOM。

Comment	Description	Designator
225	Capacitor	C1, C2, C3, C4, C5, C6, C7, C8
104	Capacitor	C9, C10, C11, C12, C13
10uF/16V	Polarized Capacitor (Radial)	C14, C17
22p	Capacitor	C15, C16
LED		D1
PW	Connector	J1
IDC80		JP1, JP2
Header 7X2	Header, 7-Pin, Dual row	JTAG1
10uH		L1, L2, L3
102		R1, R2, R3, R4
472		R5
222		R6
103		R7, R8
0R		R9, R10
AT24C512		U1
TMS320F28035-80		U2
LM1117-3.3		U3
6M	Crystal Oscillator	Y1

软件方案

软件是DSP方案，采用规则采样法和DSP片内ePWM模块功能实现PWM和SPWM波。PV最大功率点跟踪（MPPT）采用了恒压跟踪法（CVT法）来实现，并用软件锁相环进行系统的同频、同相控制，控制灵活简单。软件工程用CCS打开。

审核编辑：汤梓红