CN215601045U

CN215601045U - Integral grid-connected control system

Info

Publication number: CN215601045U
Application number: CN202023169353.4U
Authority: CN
Inventors: 邓旺宇
Original assignee: Sunwoda Electronic Co Ltd
Current assignee: Sunwoda Electronic Co Ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2022-01-21
Anticipated expiration: 2030-12-24

Abstract

The utility model discloses an integral grid-connected control system, which comprises: the sampling module is used for acquiring a reference voltage value of the bus voltage at the previous moment and a real-time value of the current moment; the first filtering module is used for filtering the reference voltage value; the time delay storage module is used for storing the reference voltage value after time delay according to preset time to obtain a time delay value; the data processing module is used for calculating the real-time value and the delay value to obtain the average value of the bus voltage; the data selector is used for selecting the average value so as to output a feedback value to the power grid. According to the utility model, the real-time value and the delay value are calculated to obtain the average value of the bus voltage, the obtained average value is selected by the data selector to obtain the feedback value to be output to the power grid, so that the stable and pure feedback value of the bus voltage is obtained, the control of the power grid is not influenced, and the power grid can be stably controlled.

Description

Integral grid-connected control system

Technical Field

The utility model relates to the technical field of smart power grids, in particular to an integral grid-connected control system.

Background

Electric energy is one of necessary energy sources in our lives, and the quality of the electric energy is directly related to the life quality of users and the service life of electric equipment. The solar energy is converted and stored for users to use, so that the solar energy storage device is clean and convenient, more benefits can be obtained, and the solar energy storage needs to be controlled by an energy storage system.

At present, for the quality, stability and the like of energy of an energy storage system, energy storage inverter software in the energy storage system plays a decisive role, and general energy storage inverter software comprises: solar Maximum Power Point Tracking (MPPT) control, battery DC-DC power control, power grid AC-DC control and the like. The DC-DC power control of the battery is relatively fixed, and a voltage-current double closed-loop control algorithm is adopted; the control of the power grid AC-DC is relatively complex and mainly comprises a grid-connected control strategy and an off-grid control strategy. However, in many controls of the energy storage system, secondary ripple disturbance of the bus voltage has a large influence on a control strategy in the energy storage system, and if the bus capacitor on hardware is designed relatively unreasonably, the ripple is larger, so that grid connection performance is greatly reduced, a power grid is polluted, other electric equipment is interfered, and the service life of the electric equipment is shortened.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides an integral grid-connected control system which can output a stable feedback value to a power grid so that the power grid can operate normally and control stably.

One embodiment of the present invention provides an integral grid-connected control system, including:

the sampling module is used for acquiring a reference voltage value of the bus voltage at the previous moment and a real-time value of the current moment;

the first filtering module is used for filtering the reference voltage value;

the time delay storage module is used for storing the reference voltage value after time delay according to preset time to obtain a time delay value;

the data processing module is used for calculating the real-time value and the delay value to obtain an average value of the bus voltage;

and the data selector is used for selecting the average value so as to output a feedback value to the power grid.

The integral grid-connected control system provided by the embodiment of the utility model at least has the following beneficial effects: the reference voltage value and the real-time value of the bus voltage are sampled, the sampled reference voltage value is subjected to filtering processing to obtain a pure reference voltage value, the reference voltage value is delayed for preset time and then stored to obtain a delay value, the real-time value and the delay value are calculated to obtain an average value of the bus voltage, the obtained average value is selected by a data selector to obtain a feedback value, and the feedback value is output to a power grid, so that the stable and pure feedback value of the bus voltage is obtained, the control of the power grid is not influenced, and the power grid can be stably controlled.

According to another embodiment of the present invention, an integral grid-connected control system further includes:

and the second filtering module is used for carrying out low-frequency filtering processing on the average value and outputting the average value to the data selector.

the driving module is used for outputting a driving signal;

and the conversion module is used for converting the feedback value of the alternating current signal into the feedback value of the direct current signal according to the driving signal.

According to the integral grid-connected control system of other embodiments of the present invention, the conversion module is a single-phase grid-connected inverter of H6 bridge topology.

According to other embodiments of the present invention, the integral grid-connected control system, the conversion module includes: the bridge arm comprises a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, a sixth MOS tube, a first diode, a second diode and a plurality of filter capacitors, wherein the first MOS tube, the fifth MOS tube and the sixth MOS tube form a first bridge arm, and the second MOS tube, the third MOS tube and the fourth MOS tube form a second bridge arm.

According to the integral grid-connected control system of other embodiments of the present invention, the sampling module, the delay storage module, the data processing module, the data selector, and the driving module are integrated into one control chip, and the model of the control chip is DSP-TMS 28069.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

FIG. 1 is a block diagram of an embodiment of an integral grid-connected control system according to the present invention;

FIG. 2 is a schematic circuit diagram of an embodiment of an integral grid-connected control system according to the present invention;

FIG. 3 is a schematic flow chart of an embodiment of an integral grid-connected control method according to the present invention;

FIG. 4 is a schematic flow chart of an integral grid-connected control method according to another embodiment of the present invention;

FIG. 5 is a schematic flow chart of another embodiment of the integral grid-connected control method according to the embodiment of the present invention;

FIG. 6 is a schematic flow chart of another embodiment of the integral grid-connected control method according to the embodiment of the present invention;

FIG. 7 is a schematic flow chart of an integral grid-connected control method according to another embodiment of the present invention;

fig. 8 is a schematic flow chart of another embodiment of the integral grid-connected control method according to the embodiment of the present invention.

Reference numerals: 100. a sampling module; 200. a first filtering module; 300. a delay storage module; 400. a data processing module; 500. a data selector; 600. a second filtering module; 700. a drive module; 800. and a conversion module.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

Conventional energy storage systems include: the energy storage system comprises energy storage inverter software, EMS energy management software, user software and the like, wherein the EMS energy management software and the user software have more great influence on the aspect of user experience, and play a decisive role in the energy storage inverter software such as the quality and the stability of energy of the energy storage system. Wherein, energy storage inverter software includes: the system comprises a solar maximum power tracking control system, a battery DC-DC power control system, a power grid AD-DC control system and the like. The solar maximum power tracking control system commonly uses an MPPT algorithm which combines intelligent tracking, such as delt _ P/delt _ V maximum power point tracking, UI maximum power point tracking, multi-peak tracking and the like. The battery DC-DC power control is relatively fixed, and a voltage-current double closed-loop control algorithm is generally adopted. The power grid AC-DC control system mainly comprises: a grid-connected control method and an off-grid control method. The control method of the AC-DC control system generally comprises a voltage outer ring and a current inner ring, and the stability and the accuracy of the AC-DC control system are improved through an optimization controller, so that the performances of a grid-connected control method and an off-grid control method are improved. However, the secondary ripple of the bus voltage disturbs the control in the AC-DC control system, and if the design of the bus capacitor is relatively unreasonable, the ripple is larger, so that the grid-connected performance is greatly reduced, the power grid is polluted, other electric equipment is disturbed, and the service life of the electric equipment is shortened.

Therefore, the integral grid-connected control system is provided, and the average value is obtained after the integral is carried out on the ripple period of the bus voltage, so that stable feedback data are obtained to carry out AC-DC control.

In a first aspect, referring to fig. 1, an embodiment of the present invention further discloses an integral grid-connected control system, including: the sampling module 100, the first filtering module 200, the delay storage module 300, the data processing module 400 and the data selector 500; the sampling module 100 is configured to collect a reference voltage value of a bus voltage at a previous time and a real-time value at a current time; the first filtering module 200 is configured to perform filtering processing on the reference voltage value; the delay storage module 300 is configured to store the reference voltage value after delaying according to a preset time to obtain a delay value; the data processing module 400 is configured to calculate the real-time value and the delay value to obtain an average value of the bus voltage; the data selector 500 is used to select the average value to output a feedback value into the grid.

After the sampling module 100 collects the reference voltage value of the bus voltage, the first filtering module 200 filters the reference voltage value to obtain a pure reference voltage value, the delay storage module 300 delays the reference voltage value for a preset time and then stores the delayed value to obtain a delay value, the data processing module 400 calculates the real-time value and the delay value to obtain an average value of the bus voltage, and finally selects the average value through the data selector 500 to obtain a feedback value of the bus voltage, so that the feedback value is output to the power grid, and the power grid can be stably controlled.

The integral grid-connected control system further comprises: a second filtering module 600; the second filtering module 600 is configured to perform low-frequency filtering processing on the average value and output the average value to the data selector 500.

The average value is subjected to a low frequency filtering process by the second filtering module 600 to remove noise in the average value to obtain a clean average value.

In some embodiments, an integral-grid-connected control system further comprises: the driving module 700 is used for outputting a driving signal, and the converting module 800 is used for receiving the driving signal and converting a feedback value of an alternating current signal into a feedback value of a direct current signal according to the driving signal.

Because the reference voltage value sampled by the sampling module 100 is an ac signal, the reference voltage value can be delayed only by the ac signal to obtain a delay value, the delay value and the real-time value are calculated to obtain an average value, and then the feedback value is obtained through the data selector 500, the process of performing data calculation can be completed only by the ac signal, but the current signal received by the power grid is a dc signal, the feedback value of the ac signal needs to be converted into the feedback value of the dc signal through the conversion module 800, and the conversion module 800 drives according to the driving signal output by the driving module 700 to realize the function of converting the ac signal into the dc signal.

The sampling module 100, the delay storage module 300, the data processing module 400, the data selector 500 and the driving module 700 are integrated into a control chip, and an integral grid-connected control algorithm and a digital double closed-loop control algorithm are stored in the control chip. The control chip performs data delay, calculation and averaging according to an integral grid-connected control algorithm to obtain a stable feedback value, and the control chip outputs a corresponding driving signal according to a digital double closed-loop control algorithm to control the conversion function of the conversion module 800. The model of the control chip is DSP-TMS28069, the control chip is connected with the conversion module 800, the conversion module 800 is connected with a power grid, and the conversion module 800 converts the feedback value of the alternating current signal into the feedback value of the direct current signal according to the driving signal output by the control chip and inputs the feedback value into the power grid, so that the power grid normally receives electric energy.

Referring to fig. 1 and 2, in some embodiments, the conversion module 800 is a single-phase grid-connected inverter of an H6 bridge topology, and the single-phase grid-connected inverter of an H6 bridge topology is composed of 6 MOS transistors, 2 diodes, a plurality of filter capacitors, and a plurality of inductors, and a screenshot of a circuit connection structure of the 6 MOS transistors, the 2 diodes, the plurality of filter capacitors, and the plurality of inductors refers to fig. 2. The 6 MOS transistors are respectively defined as a first MOS transistor S1, a second MOS transistor S2, a third MOS transistor S3, a fourth MOS transistor S4, a fifth MOS transistor S5 and a sixth MOS transistor S6, and the 2 diodes are respectively defined as a first diode D1 and a second diode D2. The first MOS tube S1, the fifth MOS tube S5 and the sixth MOS tube S6 form a first bridge arm, and the second MOS tube S2, the third MOS tube S3 and the fourth MOS tube S4 form a second bridge arm. When the current is a forward current, the current of the first bridge arm flows in a positive direction, the current flows from Bus +, and then flows according to the sequence of the first MOS transistor S1, the fifth inductor L5, the fifth MOS transistor S5 or the sixth MOS transistor S6, and the freewheeling loop is as follows: the fifth inductor L5 flows to the fifth MOS transistor S5 and the second diode D2. When the current is negative current: flows from BUS _ -, and flows in sequence of the third MOS tube S3, the first diode D1, the sixth inductor L6, the first MOS tube S1 and BUS _ +, and flows from the sixth inductor L6 to the second MOS tube S2 and the first diode D1 as a freewheeling circuit. The working principle of the second bridge arm is the same as that of the first bridge arm, and the description is omitted here. The driving signal output by the chip is controlled to control the on and off of the first MOS transistor S1, the second MOS transistor S2, the third MOS transistor S3, the fourth MOS transistor S4, the fifth MOS transistor S5 and the sixth MOS transistor S6, so that the function of converting an alternating current signal into a direct current signal is realized.

In a second aspect, referring to fig. 3, an embodiment of the present invention discloses an integral grid-connected control method, including:

s100, sampling a reference voltage value at the previous moment of the bus voltage, and filtering the sampled reference voltage value.

The reference voltage value of the bus voltage at the previous moment is obtained through AD sampling, then the reference voltage value is filtered, the filtering is RC filtering, and high-frequency noise in the reference voltage value is removed through the RC filtering, so that a pure and stable reference voltage value is obtained.

And S200, delaying and storing the filtered reference voltage value according to preset time to obtain a delay value.

And filtering the reference voltage value, delaying for a preset time and then storing the reference voltage value so as to obtain a delayed value of the bus voltage after delay.

And S300, acquiring a real-time value of the bus voltage at the current moment, and calculating the delay value and the real-time value to obtain an average value of the bus voltage.

The reference voltage value and the real-time value have a difference of a preset time period, that is, if the reference voltage value is obtained at the first moment, the real-time value is obtained at the second moment. And when the real-time value at the second moment becomes the reference voltage value at the third moment, the real-time value is acquired again at the third moment to replace the real-time value at the second moment. The delay value and the real-time value are calculated to obtain an average value, so that the average value of the pure and stable bus voltage is obtained preliminarily, and the noise in the bus voltage is reduced.

And S400, selecting the average value through a data selector to output a feedback value of the bus voltage to the power grid.

Wherein the data selector mainly selects a slow stable signal and a fast abrupt signal.

The reference voltage value of the bus voltage is sampled and then filtered, so that noise in the reference voltage value of the bus voltage is eliminated, and a relatively pure reference voltage value is obtained. And then, delaying the reference voltage value for a preset time and storing the reference voltage value to obtain a delay value, and then calculating the delay value and the real-time value to obtain an average value. The average value is selected through a data selector according to a slow stable signal and a fast sudden change signal in the bus voltage so as to improve the cut-to frequency of average value sampling, obtain a feedback value which is pure and stable in the bus voltage, output the feedback value to the power grid, participate in double-loop control of the power grid, improve the performance of an AC-DC control system, input the stable and pure feedback value to the power grid, and enable the power grid to receive stable and pure electric energy.

In some embodiments, since a bus in a power grid may be impacted by power of a photovoltaic module, a battery module, and the like, a fast response speed of a grid-connected inverter control system is required. Therefore, the frequency of sampling the reference voltage value is at least twice of the control frequency of the grid-connected inverter control, wherein the integral of the control frequency of the grid-connected inverter control is the control frequency of the grid-connected control method. In the present embodiment, the sampling frequency is twice the control frequency of the grid-connected inverter control, and in other embodiments, the sampling frequency may be three times, four times, or the like. By setting the sampling frequency to be twice of the control frequency of the grid-connected inversion control, the control frequency and the sampling frequency are prevented from aliasing, and the response speed of the grid-connected inversion control is increased. The reference voltage value of the bus voltage at the previous moment is sampled by AD, RC filtering is carried out on the reference voltage value to form first-order RC filtering, high-frequency noise above a filter cut-off frequency is used, and the formula of a filtering algorithm for carrying out RC filtering on the reference voltage value is as follows:

Yn＝α*Xn+(1-α)*Yn-1 (1)

wherein α ═ 2 ═ Δ t ═ Fc, α ═ filter coefficients; x (n) this sample value; y (n-1) is the last filtered output value; since y (n) is the current filtering output value, x (n) is the value before the filtering of the reference voltage value, and y (n) is the value after the filtering of the reference voltage value.

In some embodiments, since the ripple of the bus voltage is the natural frequency disturbance, and the natural frequency is 2 times of the frequency of the grid voltage, the preset time is a half cycle, so as to delay the reference voltage value by half cycle and then store the reference voltage value to obtain a delay value, so that the delay value and the real-time value are calculated to obtain a stable and pure average value.

Referring to fig. 4, in some embodiments, step S300 specifically includes:

s310, acquiring a real-time value of the current bus voltage;

s320, subtracting the real-time value and the delay value to obtain a difference value;

and S330, performing integral operation by taking the difference value as an integral accumulated quantity to obtain an average value of the bus voltage.

The real-time value is delayed for half a period to obtain a delayed value, the delayed value and the real-time value are subtracted to obtain a difference value, the difference value is used as an integral accumulated quantity to carry out integral operation to obtain an average value of the bus voltage, and the average value of the bus voltage is calculated according to the formula

In the formula, Bus _ Aug is an average value, Bus _ Vlot is a real-time value, and Bus _ Dely is a delay value.

And the bus voltage is subtracted according to the real-time value and the delayed value and then integrated to obtain the average value of the bus voltage, so that a more accurate bus voltage value is obtained.

Referring to fig. 5, in some embodiments, the integral grid-tie control method further includes:

and S500, carrying out low-frequency filtering processing on the average value.

Because the real-time value and the delay value have high-frequency signals such as steps in the process of subtracting, the inversion grid-connected control system can be greatly disturbed, and therefore the average value of the bus voltage obtained through calculation is subjected to low-frequency filtering to filter out high-frequency interference signals, and the feedback value input by the power grid is more stable. In particular, the low frequency filtering employs low pass filtering as RC filtering.

Referring to fig. 6, in some embodiments, the integral grid-tie control method further includes:

s600, obtaining a feedback value as a compensation error correction amount;

s700, dynamically adjusting the average value according to the compensation error correction amount to obtain a final average value, and outputting the final average value to a data selector.

The integration operation is introduced into the integral grid-connected control method, and the accumulation of the storage error of the integration operation, namely the integration floating phenomenon, is usually called, and the error is irreversible, so that the finally obtained feedback value and the actual value have deviation. The system hardware can be damaged when the long-time deviation is accumulated to a certain amount and exceeds the hardware limit, so that the feedback value of the bus voltage is periodically acquired and used as a compensation error correction amount of the integral to carry out dynamic adjustment to obtain a final average value, and the redundancy and the stability of the system are improved. The calculation formula of the final average value which is used as the compensation error correction amount to carry out dynamic adjustment according to the feedback value is as follows:

Bus_Avg＝CompRadioA·Bus_Avg+CmpRadio·Bus_Avg_Cal (3)

wherein CmpRadioA is the first compensation factor and CmpRadioB is the second compensation factor, and in this embodiment, the first compensation factor is 0.8 and the second compensation factor is 0.2.

The feedback value is used as an error correction amount, specifically, the feedback value is compared with a filtered real-time value, if the difference between the filtered real-time value and the feedback value is obvious, the filtered real-time value is removed, so that a second special real-time value close to the feedback value is reserved, the real-time value with overlarge error is removed, and the accuracy of feedback value calculation is improved.

In some embodiments, the data selector is a momentary switch, and the slow stable signal and the fast abrupt signal in the average value of the bus voltage are optimally selected through the momentary switch to improve the cut-off frequency of sampling, so that the response speed of grid-connected inverter control is increased.

Finally, a feedback value which is relatively pure and stabilizes the bus voltage is obtained to participate in the double-loop control in the power grid, so that the power grid receives the stabilized bus voltage.

Referring to fig. 7 and 8, in some embodiments, the integral grid-connection control method further includes:

s800, controlling a set value and a feedback value of the bus voltage through a voltage loop to form a control current;

s900, sampling the inductive current, and predicting the current to obtain a predicted current;

s1000, superposing the predicted current and the control current to output to a current loop control;

s1100, the current loop regulates the predicted current and the control current to output grid-connected current to the single-phase inverter;

and S1200, converting the grid-connected current into direct current by the single-phase inverter to be output to a power grid.

The control current is obtained by calculating according to the set value and the feedback value of the bus voltage, and then the prediction current is obtained by inductance sampling. The predicted current and the control current are then superimposed to output a value current loop. The current loop meets the set requirements by adjusting the current, the power and the PF of the predicted current and the control current according to a double-loop control algorithm to form grid-connected current, the grid-connected current is output to the single-phase inverter, and the single-phase inverter converts the grid-connected current into direct current to output the direct current to a power grid. The inductor current is rapidly sampled and then predicted to obtain predicted current, and the predicted current and the control current are overlapped to form a larger current value so as to be easier to carry out grid-connected control. Because there is time delay when the inductive current is sampled according to the sampling frequency, and the predicted current is obtained after the inductive current is predicted, the inductive current is not required to be output after the inductive current is sampled, and the control speed of grid-connected inversion control can be accelerated according to the superposition of the predicted current and the control current, so that a high-quality grid-connected current waveform can be obtained. The calculation formula for predicting the inductive current to obtain the predicted current is as follows:

I_fb＝I_Curr+Radio·(I_Curr-I_Last) (4)

in the formula, I _ fb is a predicted current, I _ Curr is an inductor current, Radio is a predicted parameter, and I _ Last is an inductor current at the previous time.

And (4) calculating to obtain a predicted current according to a formula (4), namely predicting the next inductive current by the currently acquired inductive current to obtain the predicted current. The speed of current control can be improved by predicting the current so as to obtain a high-quality grid-connected current waveform.

An integral grid-connection control method according to an embodiment of the present invention is described in detail with reference to fig. 2 to 8 as a specific embodiment. It is to be understood that the following description is illustrative only and is not intended as a specific limitation on the utility model.

And obtaining a reference voltage value of the bus voltage at the previous moment through AD sampling, and then filtering the reference voltage value by RC (resistance-capacitance) filtering to remove high-frequency noise cut above the frequency so as to obtain a pure reference voltage value. And after the reference voltage value is obtained, storing the reference voltage value after delaying for a half cycle to obtain a delay value, subtracting the delay value from a real-time value obtained at the current moment to obtain a difference value, and performing integral operation by taking the difference value as an integral accumulated quantity to obtain an average value of the bus voltage. The average value of the bus voltage is then low frequency filtered to filter out high frequency interference signals. The average value after low-frequency filtering is dynamically adjusted according to a feedback value serving as a compensation error correction amount to obtain a final average value, the final average value is optimally selected through an instantaneous switch for a slow-speed stable signal and a fast-speed sudden change signal to obtain a feedback value of pure and stable bus voltage, the feedback value and a set value of the bus voltage are controlled through an voltage loop to obtain a control current, then the inductive current is sampled, the sampled inductive current is predicted to obtain a predicted current, the predicted current and the control current are overlapped to be output to a current loop for control, then the current loop outputs a grid-connected current value to a single-phase inverter to be converted into direct current, and the direct current is output to a power grid. The speed of current loop control is improved by predicting the current, and high-quality grid-connected current waveforms are obtained without affecting the stability of a power grid.

In a third aspect, an embodiment of the present invention further discloses a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are used to enable a computer to execute the integral grid-connected control method according to the first aspect.

The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Claims

1. An integral grid-connected control system, comprising:

the first filtering module is used for filtering the reference voltage value;

2. The integral grid-connected control system according to claim 1, further comprising:

3. The integral grid-connected control system according to claim 1, further comprising:

the driving module is used for outputting a driving signal;

4. The integral grid-connected control system according to claim 3, wherein the conversion module is a single-phase grid-connected inverter of H6 bridge topology.

5. The integral grid-connected control system according to claim 4, wherein the conversion module comprises: the bridge arm comprises a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth MOS tube, a sixth MOS tube, a first diode, a second diode and a plurality of filter capacitors, wherein the first MOS tube, the fifth MOS tube and the sixth MOS tube form a first bridge arm, and the second MOS tube, the third MOS tube and the fourth MOS tube form a second bridge arm.

6. The integral grid-connected control system according to claim 3, wherein the sampling module, the delay storage module, the data processing module, the data selector and the driving module are integrated into a control chip, and the control chip is of a model of DSP-TMS 28069.