CN107248753B - Control method of power distribution network system for light storage power generation - Google Patents
Control method of power distribution network system for light storage power generation Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009826 distribution Methods 0.000 title claims abstract description 16
- 238000003860 storage Methods 0.000 title claims abstract description 11
- 238000007600 charging Methods 0.000 claims abstract description 73
- 238000001514 detection method Methods 0.000 claims abstract description 40
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000010277 constant-current charging Methods 0.000 claims description 2
- 238000011217 control strategy Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 230000008859 change Effects 0.000 description 1
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a control method of a power distribution network system of light storage power generation, which belongs to the technical field of power grid control and comprises a photovoltaic power generation power supply, a constant voltage DC/DC circuit, a DC/AC grid-connected inverter circuit, a DC/DC charging circuit, a battery pack, a DC/DC discharging circuit, a power detection charging controller, a compensation controller, a grid-connected control circuit and a load. The power detection charging controller, the compensation controller and the grid-connected control circuit are used for detecting the power of different point lines respectively, and the constant-voltage DC/DC circuit, the DC/AC grid-connected inverter circuit and the DC/DC charging circuit are controlled according to the detected power, so that the output power of the output end of the DC/AC grid-connected inverter circuit is the same as the set power finally, the output electric energy is more stable, and the electric energy quality is better.
Description
Technical Field
The invention relates to the technical field of power grid control, in particular to a control method of a power distribution network system for light storage power generation.
Background
The electric energy is an indispensable large energy source in daily life and social production of people, is a necessary energy source for promoting social progress and urban construction, has the advantages that two other resources cannot be replaced, and is convenient to use, clean and efficient. However, with the wide application of electric energy in social production and life, certain problems also arise in electric energy use, wherein the electric energy use is safe and the economic electricity utilization is particularly prominent. Therefore, the demand of modern residents on electric energy is continuously increased, and new demands are made on the development of the power industry. The most urgent requirements of people are three, namely, the requirements of distributed energy utilization, such as wind power generation, photovoltaic power generation and the like; secondly, renewable energy power generation, and thirdly, intermittent random power generation.
At present, the proportion of photovoltaic power generation in a power distribution network is increased continuously, and the independent grid-connected operation of the photovoltaic power generation has great influence on the electric energy quality of the power distribution network and is not beneficial to the stable operation of the power distribution network.
The patent with application publication number CN 104810858A discloses a control method of a grid-connected power generation system of a light storage micro-grid, the control method respectively performs maximum power tracking control and constant voltage control on a photovoltaic power generation power supply through a Boost converter control strategy, controls charging and discharging of an energy storage module through a bidirectional DC-DC converter control strategy, and stabilizes grid-connected point voltage through a DC-AC grid-connected inverter control strategy. Because the bidirectional DC-DC converter is charged and discharged and is connected after the output of the Boost converter, the output voltage and power cannot be well determined during charging, and the electric power output to a power grid by the DC-AC grid-connected inverter has larger error. The requirement of stable control of photovoltaic power output cannot be met, so a control method capable of enabling a photovoltaic power output power grid to be more stable needs to be designed.
Disclosure of Invention
The invention aims to provide a control method of a power distribution network system of optical storage power generation, and aims to solve the technical problem that the output of the existing power distribution network of optical storage power generation is unstable.
In order to achieve the purpose, the invention provides a control method of a power distribution network system of optical storage power generation, wherein the system comprises a photovoltaic power generation power supply, a constant voltage DC/DC circuit, a DC/AC grid-connected inverter circuit, a DC/DC charging circuit, a battery pack, a DC/DC discharging circuit, a power detection charging controller, a compensation controller, a grid-connected control circuit and a load; the output end of the photovoltaic power generation power supply is connected with a sliding resistor in parallel and is connected with a constant voltage DC/DC circuit, the input end of a DC/DC charging circuit is arranged on the sliding resistor, the output end of the constant voltage DC/DC circuit is connected with a load through a DC/AC grid-connected inverter circuit, the output end of the DC/DC charging circuit is connected with the charging end of a battery pack, the output end of the battery pack is connected with the input end of the DC/AC grid-connected inverter circuit through a DC/DC discharging circuit, the power detection charging controller power detection end is connected with the output end of the photovoltaic power generation power supply, the control end of the power detection charging controller is connected with the DC/DC charging circuit, the current detection end of the compensation controller is connected with the output end of the constant voltage DC/DC circuit, the control end of the compensation controller is connected with the DC, the power detection end of the grid-connected control circuit is connected with the output end of the DC/AC grid-connected inverter circuit, the control end of the grid-connected control circuit is connected with the DC/AC grid-connected inverter circuit, and the grid-connected control circuit is connected with the compensation controller through a data line; the method comprises the following steps:
step 1: the power detection end of the power detection charging controller detects the power of the output end of the photovoltaic power generation power supply and transmits the detected power to the compensation controller;
step 2: power sensing charge controllerThe power is compared with the input power of the originally set constant voltage DC/DC circuit, and the power detection charging controller detects the detected power p1Input power P of constant voltage DC/DC circuit set originally11Making a comparison when p1Greater than P11When the charging control circuit is in the charging state, the power detection charging controller controls the DC/DC charging circuit to charge the battery pack, and the charging power is equal to p1And P11When p is different from1Is less than or equal to P11When the battery pack is not charged;
and step 3: the current detection end of the compensation controller detects the current of the output end of the constant voltage DC/DC circuit, and the compensation controller collects the current i of the output end of the constant voltage DC/DC circuit2The voltage output by the constant voltage DC/DC circuit is constant at u2To obtain the output power p of the DC/DC discharge circuit2＝i2*u2The input power of the DC/AC grid-connected inverter circuit is p22When p is22Greater than p2Then, the DC/DC discharge circuit is controlled to discharge with a discharge power of p222＝p22－p2Current of discharge i222＝p222÷u2When p is22P is less than or equal to2When so, the battery pack does not discharge;
and 4, step 4: the grid-connected control circuit collects the power of the output end of the DC/AC grid-connected inverter circuit and transmits the collected power to the compensation controller;
and 5: the grid-connected control circuit collects the current i at the output end of the DC/AC grid-connected inverter circuit3And voltage u3To obtain the power p of the output end of the DC/AC grid-connected inverter circuit3＝i3*u3When current i3Or voltage u3When the current or the voltage deviates from the original set current or voltage of the load, the grid-connected control circuit controls the DC/AC grid-connected inverter circuit to further regulate the output current i3And voltage u3When power p3When the power is less than the original set rated power, the compensation controller controls the DC/DC discharge circuit to increase the discharge power, and the increased discharge power is the original set rated power and p3And finishing the fixed power output control of the power distribution network system by the difference value.
In the above embodiment, the preferred procedure is1, detecting the power of the output end of the photovoltaic power generation power supply in a process that a power detection charging controller collects the current i of the output end of the photovoltaic power generation power supply1And voltage u1To obtain the power p of the output end of the photovoltaic power generation power supply1＝i1*u1。
In the above scheme, preferably, the charging of the battery in step 2 is controlled by switching a sliding resistor at the input end of the DC/DC charging circuit to control constant current charging and changing the voltage to control the charging power.
In the above aspect, it is preferable that the sliding resistor is an electrically controlled sliding resistor R1Sliding resistance R1And performing sliding adjustment according to the electric control signal.
In the above scheme, it is preferable that the discharge power in step 3 is p222, which includes a discharge power loss during discharge and a power transmission loss of circuit transmission.
In the above-mentioned scheme, it is preferable that the constant voltage DC/DC circuit is a constant voltage Boost circuit, and the output voltage is constant u2。
The invention has the following beneficial effects:
1. the invention detects the power of different point lines through the power detection charging controller, the compensation controller and the grid-connected control circuit, and controls the constant voltage DC/DC circuit, the DC/AC grid-connected inverter circuit and the DC/DC charging circuit according to the detected power, thus forming the control of increasing, decreasing, lacking and supplementing the output current; therefore, the output power of the output end of the DC/AC grid-connected inverter circuit is the same as the set power, and the output current and voltage are similar to the original designed load voltage and current, so that the output electric energy is more stable and the quality of the electric energy is better;
2. according to the photovoltaic power supply control system, the DC/DC charging circuit adopts a constant-current variable-voltage charging mode, increase, decrease, deletion and compensation are carried out according to unstable voltage output by the photovoltaic power supply, so that primary stable control is realized, and then the DC/DC discharging circuit carries out discharging treatment, so that secondary stable control can be realized, so that output electric energy is more stable, and the quality of the electric energy is better;
3. the invention realizes the change of the charging voltage by using the controllable sliding resistor for the DC/DC charging circuit to cooperate, thereby being capable of well controlling the charging power.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a block diagram of the present invention.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
A control method of a power distribution network system of light storage power generation is disclosed, as shown in figure 1, the system comprises a photovoltaic power generation power supply, a constant voltage DC/DC circuit, a DC/AC grid-connected inverter circuit, a DC/DC charging circuit, a battery pack, a DC/DC discharging circuit, a power detection charging controller, a compensation controller, a grid-connected control circuit and a load. The sliding resistor is an electrically controlled sliding resistor R1Sliding resistance R1And performing sliding adjustment according to the electric control signal. The DC/DC charging circuit sends a control signal to the sliding resistor R1Control is carried out to carry out the sliding resistance R according to the power required to be charged1And electric control adjustment is carried out to meet the charging requirement.
The output end of the photovoltaic power generation power supply is connected with a sliding resistor in parallel and is connected with a constant-voltage DC/DC circuit, the input end of a DC/DC charging circuit is arranged on the sliding resistor, and the output end of the constant-voltage DC/DC circuit is connected with a load through a DC/AC grid-connected inverter circuit. The output end of the DC/DC charging circuit is connected with the charging end of the battery pack, the output end of the battery pack is connected with the input end of the DC/AC grid-connected inverter circuit through the DC/DC discharging circuit, and the power detection end of the power detection charging controller is connected with the output end of the photovoltaic power generation power supply. The control end of the power detection charging controller is connected with the DC/DC charging circuit, the current detection end of the compensation controller is connected with the output end of the constant voltage DC/DC circuit, and the control end of the compensation controller is connected with the DC/DC discharging circuit. The power detection charging controller is connected with the compensation controller through a data line. The power detection end of the grid-connected control circuit is connected with the output end of the DC/AC grid-connected inverter circuit, the control end of the grid-connected control circuit is connected with the DC/AC grid-connected inverter circuit, and the grid-connected control circuit is connected with the compensation controller through a data line. The control method comprises the following steps:
step 1: and the power detection end of the power detection charging controller detects the power of the output end of the photovoltaic power generation power supply and transmits the detected power to the compensation controller. The process of detecting the power of the output end of the photovoltaic power generation power supply comprises the following steps that the power detection charging controller collects the current i of the output end of the photovoltaic power generation power supply1And voltage u1To obtain the power p of the output end of the photovoltaic power generation power supply1＝i1*u1. The power detection charging controller detects the voltage and the current of the output end of the photovoltaic power generation power supply through a voltage sensor and a current sensor, and the voltage sensor and the current sensor are conventional sensors.
Step 2: the power detection charging controller compares the detected power with the originally set input power of the constant voltage DC/DC circuit, and judges whether to control the DC/DC charging circuit to charge the battery pack according to the comparison result. The process of judging whether to control the DC/DC charging circuit to charge the battery pack is that the power detection charging controller detects the power p1Input power P of constant voltage DC/DC circuit set originally11Making a comparison when p1Greater than P11When the charging control circuit is in the charging state, the power detection charging controller controls the DC/DC charging circuit to charge the battery pack, and the charging power is equal to p1And P11When p is different from1Is less than or equal to P11At this time, the battery pack is not charged. The sliding resistor R is matched according to the power required to be charged1And the DC/DC charging circuit controls to achieve the power magnitude needing to be charged.
And step 3: the current detection end of the compensation controller detects the current of the output end of the constant-voltage DC/DC circuit, and whether to control the current is judged according to the collected currentThe DC/DC discharge circuit discharges. The process of judging whether to control the DC/DC discharge circuit to discharge is that the compensation controller collects the current i at the output end of the constant-voltage DC/DC circuit2The voltage output by the constant voltage DC/DC circuit is constant at u2To obtain the output power p of the DC/DC discharge circuit2＝i2*u2The input power of the DC/AC grid-connected inverter circuit is p22When p is22Greater than p2Then, the DC/DC discharge circuit is controlled to discharge with a discharge power of p222＝p22－p2Current of discharge i222＝p222÷u2When p is22P is less than or equal to2At this time, the battery pack is not discharged. The compensation controller mainly has the function of compensating the power at the output end of the constant-voltage DC/DC circuit, and the output power can be changed due to different losses of the constant-voltage DC/DC circuit in the changing process.
And 4, step 4: the grid-connected control circuit collects the power of the output end of the DC/AC grid-connected inverter circuit and transmits the collected power to the compensation controller. The process of the grid-connected control circuit for acquiring the power of the output end of the DC/AC grid-connected inverter circuit comprises the step of acquiring the current i of the output end of the DC/AC grid-connected inverter circuit by the grid-connected control circuit3And voltage u3To obtain the power p of the output end of the DC/AC grid-connected inverter circuit3＝i3*u3When current i3Or voltage u3When the current or the voltage deviates from the original set current or voltage of the load, the grid-connected control circuit controls the DC/AC grid-connected inverter circuit to further regulate the output current i3And voltage u3When power p3When the power is less than the original set rated power, the compensation controller controls the DC/DC discharge circuit to increase the discharge power, and the increased discharge power is the original set rated power and p3The difference of (a). The output end of the DC/AC grid-connected inverter circuit not only needs to keep the stability of output power, but also needs to ensure that the output voltage and current are within the receiving range of the load and cannot be too large or too small.
And 5: the grid-connected control circuit controls the DC/AC grid-connected inverter circuit according to the acquired power, mainly controls the magnitude of the output voltage and current, so that the voltage and the current of the output end of the DC/AC grid-connected inverter circuit can meet the requirement of a load, and the fixed power output control of the power distribution grid system is completed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A control method of a power distribution network system of light storage power generation comprises a photovoltaic power generation power supply, a constant voltage DC/DC circuit, a DC/AC grid-connected inverter circuit, a DC/DC charging circuit, a battery pack, a DC/DC discharging circuit, a power detection charging controller, a compensation controller, a grid-connected control circuit and a load; the output end of the photovoltaic power generation power supply is connected with a sliding resistor in parallel and is connected with a constant voltage DC/DC circuit, the input end of a DC/DC charging circuit is connected with the input end of the constant voltage DC/DC circuit, the output end of the constant voltage DC/DC circuit is connected with a load through a DC/AC grid-connected inverter circuit, the output end of the DC/DC charging circuit is connected with the charging end of a battery pack, the output end of the battery pack is connected with the input end of the DC/AC grid-connected inverter circuit through a DC/DC discharging circuit, the power detection charging controller is connected with the output end of the photovoltaic power generation power supply, the control end of the power detection charging controller is connected with the DC/DC charging circuit, the current detection end of the compensation controller is connected with the output end of the constant voltage DC/DC circuit, the control end of the compensation controller is connected with, the power detection end of the grid-connected control circuit is connected with the output end of the DC/AC grid-connected inverter circuit, the control end of the grid-connected control circuit is connected with the DC/AC grid-connected inverter circuit, and the grid-connected control circuit is connected with the compensation controller through a data line; the method is characterized by comprising the following steps:
step 1: the power detection end of the power detection charging controller detects the power of the output end of the photovoltaic power generation power supply and transmits the detected power to the compensation controller;
step 2: the power detection charging controller compares the detected power P1 with the originally set constant voltage DC/DC circuit input power P11, when P1 is larger than P11, the power detection charging controller controls the DC/DC charging circuit to charge the battery pack, the charging power is the difference value between P1 and P11, and when P1 is smaller than or equal to P11, the battery pack is not charged;
and step 3: the compensation controller collects current i2 at the output end of the constant-voltage DC/DC circuit, the voltage output by the constant-voltage DC/DC circuit is constant u2, the output power p2= i2 u2 of the constant-voltage DC/DC circuit is obtained, the input power of the DC/AC grid-connected inverter circuit is p22, when p22 is larger than p2, the DC/DC discharging circuit is controlled to discharge, the discharging power is p222= p 22-p 2, the discharging current i222= p222 ÷ u2, and when p22 is smaller than or equal to p2, the battery pack does not discharge;
and 4, step 4: the grid-connected control circuit collects the power of the output end of the DC/AC grid-connected inverter circuit and transmits the collected power to the compensation controller;
and 5: the grid-connected control circuit acquires current i3 and voltage u3 at the output end of the DC/AC grid-connected inverter circuit to obtain power p3= i3 u3 at the output end of the DC/AC grid-connected inverter circuit, when the current i3 or the voltage u3 deviates from the originally set current or voltage of a load, the grid-connected control circuit controls the DC/AC grid-connected inverter circuit to further adjust the output current i3 and voltage u3, when the power p3 is smaller than the originally set rated power, the compensation controller controls the DC/DC discharge circuit to increase the discharge power, the increased discharge power is the difference between the originally set rated power and the p3, and the fixed power output control of the power distribution network system is completed;
in the step 2, the charging of the battery is controlled by accessing a sliding resistor at the input end of a DC/DC charging circuit to control constant-current charging and changing voltage to control charging power, wherein the sliding resistor is an electrically controlled sliding resistor R1, and the sliding resistor R1 performs sliding adjustment according to an electrical control signal;
the process of detecting the power of the output end of the photovoltaic power generation power supply in the step 1 is that the power detection charging controller collects the current i1 and the voltage u1 of the output end of the photovoltaic power generation power supply to obtain the power p1= i1 u1 of the output end of the photovoltaic power generation power supply.
2. The method as claimed in claim 1, wherein the discharge power p222 in step 3 includes discharge power loss during discharge and power transmission loss of circuit transmission.
3. The method for controlling the power distribution network system for optical storage power generation according to claim 2, wherein the constant voltage DC/DC circuit is a constant voltage Boost circuit, and the output voltage is constant u 2.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320048A (en) * | 2014-10-31 | 2015-01-28 | 重庆大学 | Photovoltaic power generation system with energy storage function and coordinated power supply method of photovoltaic power generation system |
| CN104810858A (en) * | 2015-05-27 | 2015-07-29 | 广西大学 | Control method for grid-connected power generation system of optical storage microgrid |
| CN106541845A (en) * | 2016-11-25 | 2017-03-29 | 上海工程技术大学 | A kind of wireless electric automobile charging system actual and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490320B (en) * | 2014-09-19 | 2018-12-21 | 比亚迪股份有限公司 | Photovoltaic plant energy storage method and system |
| JP6630536B2 (en) * | 2015-10-23 | 2020-01-15 | 日立グローバルライフソリューションズ株式会社 | Power supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320048A (en) * | 2014-10-31 | 2015-01-28 | 重庆大学 | Photovoltaic power generation system with energy storage function and coordinated power supply method of photovoltaic power generation system |
| CN104810858A (en) * | 2015-05-27 | 2015-07-29 | 广西大学 | Control method for grid-connected power generation system of optical storage microgrid |
| CN106541845A (en) * | 2016-11-25 | 2017-03-29 | 上海工程技术大学 | A kind of wireless electric automobile charging system actual and control method |
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Inventor after: Zhu Yuchen Inventor after: Wu Miao Inventor before: Wu Miao |
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Effective date of registration: 20200922 Address after: No. 13, Feng An Dong Road, Shapotou District, central Wei, the Ningxia Hui Autonomous Region Applicant after: ZHONGWEI POWER SUPPLY COMPANY, STATE GRID NINGXIA ELECTRIC POWER CO.,LTD. Address before: 601, building 6, room 410205, headquarter building, Changsha Central Power Software Park, 39, pointed mountain road, Changsha hi tech Development Zone, Hunan Applicant before: CHANGSHA SHANDAO NEW MATERIAL TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20201020 |