CN202513588U

CN202513588U - Digital signal processor (DSP) and field programmable gate array (FPGA) dual control system photovoltaic grid connected inverter

Info

Publication number: CN202513588U
Application number: CN2012201045311U
Authority: CN
Inventors: 袁长茂
Original assignee: YANGZHOU SHENYEDA MACHINERY CO Ltd
Current assignee: YANGZHOU SHENYEDA MACHINERY CO Ltd
Priority date: 2012-03-20
Filing date: 2012-03-20
Publication date: 2012-10-31
Anticipated expiration: 2022-03-20

Abstract

The utility model discloses a DSP and FPGA dual control system photovoltaic grid connected inverter, comprising a DSP and an FPGA connected via an I/O port. The DSP is connected with an analog quantity acquisition module via an A/D port, the analog quantity acquisition module is connected with an IN port of the FPGA via a hardware protection comparison circuit, and the FPGA is connected with DC and AC fault-signal modules; the FPGA is connected with a module outputting DC, AC, PWM, driving and reset signals via a buffer circuit, and the DSP and the FPGA are connected with a grid connected relay module via a drive circuit. The DSP and FPGA dual control system photovoltaic grid connected inverter gives full play to the respective functions of the DSP and the FPGA, and has software operation control protection and also hardware efficient real time protection to the photovoltaic grid connected inverter; by adding the FPGA, the DSP control system protection function redundancy is increased, so that the photovoltaic grid connected inverter has high performance, reliability and security.

Description

A kind of DSP and FPGA double control system photovoltaic combining inverter

Technical field

The utility model relates to a kind of photovoltaic combining inverter; Be specifically related to a kind of DSP (Digital Signal Processor; Digital signal processor) and FPGA (Field-Programmable Gate Array, programmable logic device array) double control system photovoltaic combining inverter.

Background technology

Photovoltaic combining inverter is the core component of solar power generation; Be to boost through the DC/DC DC-to-DC, and carry out the tracking of maximum power point MPPT, arrive the DC/AC direct current to ac converter by solar cell panel voltages; Output and electrical network are with the synchronous alternating current of voltage same frequency; In this process, need a large amount of various signals such as processes voltage, electric current, frequency, power in real time, and carry out the monitoring of island effect simultaneously.DSP can accomplish above work, and accomplishes various defencive functions with software.The defencive function that so only uses existing dsp software system to accomplish; Speed is slower during protection; Particularly DC/DC is boosted, can not protection be provided fast in time during the high-voltage large current high power device generation critical failure that uses in the DC/AC inversion, cause device failure or useful life to reduce; And to and network relay open and close control untimely; Can cause safety problem, and combining inverter needs function of redundancy protection, promptly unexpected race of master control DSP program flies also to want to accomplish defencive function.

The utility model content

Goal of the invention: to the deficiency that exists in the prior art, the purpose of the utility model provides a kind of DSP and FPGA double control system photovoltaic combining inverter, to realize satisfying the requirement of high-performance, high reliability, high security.

Technical scheme: in order to realize the foregoing invention purpose, the technical scheme that the utility model adopts is following:

A kind of DSP and FPGA double control system photovoltaic combining inverter comprise the DSP and the FPGA that link to each other through the I/O port; Described DSP links to each other with analogue collection module through the A/D port; Described analogue collection module links to each other with the IN port of FPGA through the hardware protection comparison circuit; Described FPGA links to each other with DC, AC fault-signal module; Described FPGA drives with output DC, AC PWM through buffer circuit and links to each other with the reset signal module; Described DSP links to each other with the relay module that is incorporated into the power networks through drive circuit with FPGA.

Said and network relay has four, and described DSP and FPGA control two in four and the network relay respectively through drive circuit.

Described analogue collection module comprises d.c. input voltage signal acquisition module, direct current input current signal acquisition module, mains voltage signal acquisition module, the output voltage signal acquisition module that is incorporated into the power networks, the output current signal acquisition module that is incorporated into the power networks, dc bus voltage signal acquisition module, ac leakage guard signal acquisition module, direct current earth leakage protective signal acquisition module and temperature protection signal acquisition module.

Described DSP links to each other with the communication monitoring module through the I/O port

DSP of the utility model and FPGA form the double control system photovoltaic combining inverter; Photovoltaic DC-to-AC converter working condition signal after the DSP input analog amount is gathered; Carry out the A/D analog-to-digital conversion, operational system software is accomplished the data logical operation and is handled, FPGA input fault and guard signal; DSP and FPGA signal exchange each other, common system's control of accomplishing photovoltaic combining inverter.DSP has powerful data operation ability, can satisfy the computing requirement of the mass data of the MPPT of photovoltaic combining inverter, anti-isolated island, as the core processing unit of photovoltaic combining inverter; Completion comprises analog quantity input conversion; The system data logical operation, protection logical process, communication function.On-the-spot FPGA comprises abundant outside programmable interface, and the mode of parallel processing is adopted in the internal data operation, and real-time is high, is used through FPGA and DSP, and DC/DC boosts, and the PWM driving of DC/AC inversion and reset signal are by FPGA and the dual control of DSP.DC/DC is boosted; The critical failure of the high-voltage large current high power device that the DC/AC inversion is used and inverter significant trouble FPGA carry out real-time sampling in time to be handled; To relating to open and close safe and network relay; Control each two in four two SREs, the reliability and the fail safe that have improved inverter greatly respectively by DSP and FPGA.

Beneficial effect: DSP of the utility model and FPGA double control system photovoltaic combining inverter; Give full play to the function separately of DSP and FPGA; S operation control protection to the existing software of photovoltaic combining inverter; The high-efficiency real-time protection of hardware is arranged again, and the adding of FPGA has increased the defencive function redundancy of DSP control system, makes photovoltaic combining inverter have high-performance, high reliability, high security.

Description of drawings

Fig. 1 is the electrical schematic diagram of the utility model;

Fig. 2 is the relay circuit schematic diagram that is incorporated into the power networks of the utility model;

Fig. 3 is the system block diagram of 3KW photovoltaic combining inverter.

Embodiment

Below in conjunction with concrete accompanying drawing the utility model is done further explanation.

As shown in Figure 1, DSP and FPGA double control system photovoltaic combining inverter comprise DSP and FPGA.Analogue collection module, the signals collecting of completion DC input voitage, direct current input current, line voltage, the output voltage that is incorporated into the power networks, the output current that is incorporated into the power networks, dc bus voltage, ac leakage protection, direct current earth leakage protective, temperature protection.The analog signal input is connected on the A/D analog-to-digital conversion port of DSP, and the DSP model is selected TMS320F28035PN for use, and A/D has 16 ports.DC, AC fault-signal, the hardware protection comparison signal is connected to FPGA, and FPGA selects EPM3064A/TC44-10N for use, and DSP links to each other through the I/O port with FPGA.FPGA and DSP through driver module with and network relay link to each other.

DSP carries out data operation, and the maximum power MPPT that accomplishes the PV battery follows the tracks of, and the control of each item function, and the logical operation of being correlated with according to the data operation result realizes defencive function, and the DC/DC that generates inverter boosts, the power tube make-and-break signal of DC/AC inversion.DSP and FPGA carry out exchanges data, FPGA according to the DC/DC that DSP generates boost, the power tube make-and-break signal of DC/AC inversion realizes pwm signal output through buffer circuit.

FPGA gathers fault-signal and the hardware protection comparison signal that input DC/DC boosts, the DC/AC inversion produces, and with the DSP exchanges data, when DSP realized the logical operation protection, FPGA accomplished the protection real-time of hardware simultaneously.Wherein components from being damaged has been avoided in the protection of the high-speed real-time of FPGA high-voltage large current high power device that DC/DC is boosted, uses in the DC/AC inversion, has prolonged device useful life, has improved the reliability of photovoltaic combining inverter.

Fig. 2 is the relay circuit schematic diagram that is incorporated into the power networks of photovoltaic combining inverter; K1, K2, K3, K4 are relay among the figure, and U is a drive integrated circult, and model is selected MC1413 for use; MC1413 is high withstand voltage, big electric current darlington array reverse driven; Form by 7 silicon NPN Darlington transistors, in establish 7 diodes, can directly promote the coil of relay.FPGA control K1, K2 open and close, DSP control K3, K4 open and close are when inverter is connected to the grid; Need that K3, K4 connect when access is incorporated into the power networks after the dsp software calculation process, and K1, K2 connect when the FPGA hardware detection is incorporated into the power networks through access simultaneously, inverter just can be connected to the grid; Unusual when electrical network, the PV cell panel is unusual, produce guard signal when inverter is unusual after; Relay is turn-offed in DSP and FPGA control, as long as the also network relay of DSP and FPGA control cuts out any one group; Inverter just breaks away from electrical network, has improved the fail safe of combining inverter greatly.

Fig. 3 is the system block diagram of 3KW photovoltaic combining inverter, and the utility model is described the DSP of 3KW photovoltaic combining inverter wherein and the double control system part of FPGA.Q1 is a DC/DC DC boosting switching power tube among the figure, Q2, and Q3, Q4, Q5 are DC/AC ac converter switching power tube; Control system generates DC/DC respectively and boosts and the required pwm control signal of DC/AC inversion; And the maximum power point MPPT through software computing completion solar cell follows the tracks of when DC/DC boosts control; Its running status of DSP and FPGA control system monitoring simultaneously provides protection to switching power tube in real time; The relay K that is incorporated into the power networks among the figure 1, K2 are controlled by FPGA, and K3, K4 are controlled by DSP; DSP links to each other with the communication monitoring module through the I/O port among the figure.

Claims

1. DSP and FPGA double control system photovoltaic combining inverter, its characteristic is: comprise the DSP and the FPGA that link to each other through the I/O port; Described DSP links to each other with analogue collection module through the A/D port; Described analogue collection module links to each other with the IN port of FPGA through the hardware protection comparison circuit; Described FPGA links to each other with DC, AC fault-signal module; Described FPGA drives with output DC, AC PWM through buffer circuit and links to each other with the reset signal module; Described DSP links to each other with the relay module that is incorporated into the power networks through drive circuit with FPGA.

2. DSP according to claim 1 and FPGA double control system photovoltaic combining inverter is characterized in that: said and network relay has four, and described DSP and FPGA control two in four and the network relay respectively through drive circuit.

3. DSP according to claim 1 and FPGA double control system photovoltaic combining inverter is characterized in that: described analogue collection module comprises d.c. input voltage signal acquisition module, direct current input current signal acquisition module, mains voltage signal acquisition module, the output voltage signal acquisition module that is incorporated into the power networks, the output current signal acquisition module that is incorporated into the power networks, dc bus voltage signal acquisition module, ac leakage guard signal acquisition module, direct current earth leakage protective signal acquisition module and temperature protection signal acquisition module.

4. DSP according to claim 1 and FPGA double control system photovoltaic combining inverter is characterized in that: described DSP links to each other with the communication monitoring module through the I/O port.