CN112838600A - Power balance system based on distributed power generation system - Google Patents
Power balance system based on distributed power generation system Download PDFInfo
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- CN112838600A CN112838600A CN202110207264.4A CN202110207264A CN112838600A CN 112838600 A CN112838600 A CN 112838600A CN 202110207264 A CN202110207264 A CN 202110207264A CN 112838600 A CN112838600 A CN 112838600A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
Abstract
The invention discloses a power balance system based on a distributed power generation system, wherein in the power balance system based on the distributed power generation system, at least one super capacitor module is used for storing energy based on instantaneous peak power response, at least one rotating mechanical energy storage module is used for storing energy based on continuous high power response, the rotating mechanical energy storage module is connected with the super capacitor module in parallel, one end of a control system is connected with the distributed power generation system, a public power supply network and a user load system, the other end of the control system is connected with the energy storage module, a monitoring unit is used for monitoring the power generation power P of a distributed power supply in real timeXPower supply power P of public power supply networkDAnd the load power P of the user load systemFThe control unit is connected with the monitoring unit and the energy storage module, and the control unit generates power P based on the distributed power generation systemXPower supply power P of public power supply networkDAnd the load power P of the user load systemFTo adjust the generating power P of the energy storage moduleKThe forward direction is power generation, and the reverse direction is energy storage.
Description
Technical Field
The invention belongs to the technical field of distributed photovoltaic power generation, and particularly relates to a power balance system based on a distributed power generation system.
Background
Distributed power generation, especially distributed photovoltaic power generation, is rapidly developed at a user side, most of the distributed power generation adopts a business mode of 'spontaneous self-use and surplus power internet surfing', and obvious economic benefits are brought to the power consumption of users.
However, the prior art is still relatively extensive, the problem of matching between distributed power generation and user energy utilization is ignored while the user resources are utilized to the maximum extent to develop the distributed power generation capacity, and a mode of 'surplus power on-line and difference net compensation' is selected, so that the distributed power generation system is simple in structure as much as possible and low in manufacturing cost as much as possible. Due to the uncontrollable characteristic of distributed power generation, the power generation capacity is characterized by intermittent and rapid change, and the power load of a user is continuously and rapidly changed along with the power demand of the user, so that the matching degree between the power generation capacity of the distributed power supply and the power load demand of the user is very low. When the installed capacity of the distributed power supply is large and the user load has obvious mutation characteristics, the contradiction is more prominent, so that the economy of the distributed power generation system is greatly influenced.
In order to solve the problems, the prior art tries to adopt technologies such as electrochemical energy storage and flywheel energy storage to serve as a solution for an electric energy balancer, but the problems of high manufacturing cost, high maintenance cost, short service life, high performance guarantee difficulty and the like exist, and the electric energy balancer is not popularized and applied.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a power balance system based on a distributed power generation system, which has the advantages of long service life, low manufacturing cost and low performance attenuation rate, can be continuously operated for a long time, is used for quickly balancing the power generation capacity of a distributed power supply and the power load demand of a user, and is suitable for high-power sudden load to absorb new energy.
The invention aims to realize the following technical scheme, and the power balance system based on the distributed power generation system comprises:
an energy storage module, which comprises a power module,
at least one super capacitor module for storing energy based on transient peak power response,
at least one rotating mechanical energy storage module to store energy based on sustained high power response, the rotating mechanical energy storage module being in parallel with the super capacitor module,
one end of the control system is connected with the distributed power generation system, the public power supply network and the user load system, the other end of the control system is connected with the energy storage module, the control system comprises,
a monitoring unit for real-time monitoring the generated power P of the distributed power supplyXPower supply power P of public power supply networkDAnd the load power P of the user load systemF，
The control unit is connected with the monitoring unit and the energy storage module and is based on the generated power P of the distributed power generation systemXPower supply power P of public power supply networkDAnd the load power P of the user load systemFTo adjust the generating power P of the energy storage moduleKOr store energy, wherein PD＝PF-PX-PK。
In the power balance system based on the distributed power generation system, the control unit generates power P based on the distributed power generation systemXPower supply power P of public power supply networkDAnd the load power P of the user load systemFTo adjust the generating power P of the energy storage moduleKSo that the power supply power P of the public power supply networkDAnd (4) minimizing.
In the power balance system based on the distributed power generation system, when the power supply power PDIs 0, and the power generation power P of the distributed power generation systemXGreater than the load power P of the user load systemFAnd the control unit adjusts the energy storage module to store energy.
In the power balance system based on the distributed power generation system, the control unit comprises a judging unit for judging instantaneous peak power or continuous high power at the generator of the distributed power generation system.
In the power balance system based on the distributed power generation system, the at least one super capacitor module comprises a plurality of super capacitor modules connected in parallel, and the super capacitor module comprises a plurality of super capacitors connected in series.
In the power balance system based on the distributed power generation system, the at least one rotating machinery energy storage module comprises a plurality of rotating machinery energy storage modules, and the rotating machinery energy storage modules comprise a plurality of rotating machinery energy storage units which are connected in series.
In the power balance system based on the distributed power generation system, the rotating mechanical energy storage unit comprises an energy storage structure which realizes electric energy storage by utilizing mass body rotation potential energy adjustment.
In the power balance system based on the distributed power generation system, the control system comprises a central processing unit, a display screen and other necessary hardware which form an industrial control and a human-computer interface.
In the power balance system based on the distributed power generation system, the at least one super capacitor module stores energy with first power, the at least one rotating machinery energy storage module stores energy with second power, and the first power is larger than the second power.
In the power balance system based on the distributed power generation system, the total energy storage capacity of the rotating mechanical energy storage module is greater than that of the super capacitor module.
In the present invention, the continuous high power means: compared with the scale of the power consumption of the user, the power consumption scale of the user occupies an obvious proportion, and the power consumption scale occupies non-negligible electric energy components in the aspects of power consumption management, cost, safety and the like of the user in terms of instantaneous power and total electric energy.
Compared with the prior art, the invention has the following advantages:
compared with the prior art, the super-capacitor module and the rotary machine energy storage module are matched with each other, compared with the technologies such as electrochemical energy storage and flywheel energy storage, the system device can achieve the advantages of longer service life, lower performance attenuation rate, low maintenance requirement and long-term continuous operation, and two key technologies of the super-capacitor and the rotary machine energy storage are combined to be constructed to respectively meet the instantaneous peak power response requirement and the high-power continuous response requirement. The super capacitor and the rotary machine energy storage are both designed by adopting a module structure, the capacity ratio is flexible, the matching degree between the power generation capacity of the distributed power supply and the power utilization load demand of a user is improved, and the control system adopts a dual-target control strategy, so that on one hand, the distributed power generation capacity is fully used for meeting the load demand of the user, and the electric energy consumption is completed at the highest price; on the other hand, the impact of 'surplus power on-line and difference power compensation' on the power grid is reduced; and the system can also participate in user side demand response when having residual force, so as to generate direct economic benefit for the user.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is an installation schematic of a power balancing system according to one embodiment of the present invention;
fig. 2 is a schematic diagram of a power balancing system configuration according to an embodiment of the present invention.
The invention is further explained below with reference to the figures and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 2. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
For better understanding, as shown in fig. 1 to 2, a power balancing system based on a distributed power generation system includes,
the energy storage module 1 comprises an energy storage module,
at least one supercapacitor module 3 which stores energy based on transient peak power response,
at least one rotating mechanical energy storage module 4 for storing energy based on continuous high power response, the rotating mechanical energy storage module 4 being connected in parallel with the super capacitor module 3,
one end of the control system 2 is connected with the distributed power generation system, the public power supply network and the user load system, the other end of the control system is connected with the energy storage module 1, the control system 2 comprises,
a monitoring unit for real-time monitoring the generated power P of the distributed power supplyXPower supply power P of public power supply networkDAnd the load power P of the user load systemF，
The control unit is connected with the monitoring unit and the energy storage module 1 and is based on the generated power P of the distributed power generation systemXPower supply power P of public power supply networkDAnd the load power P of the user load systemFTo adjust the generating power P of the energy storage module 1KOr store energy, wherein PD＝PF-PX-PK。
In a preferred embodiment of the power balance system based on the distributed power generation system, the control unit generates power P based on the distributed power generation systemXPower supply power P of public power supply networkDAnd the load power P of the user load systemFTo adjust the generating power P of the energy storage module 1KSo that the power supply power P of the public power supply networkDAnd (4) minimizing.
The invention tracks the generated power P of the distributed power supply in real timeXThe electrical load power P of the userFPower supply power P of electric networkD. The device control system 2 supplies power P to the power grid according to the power balance control strategyDMinimizing to control target, real-time adjusting power generation power P of rapid power device systemK. The control system 2 provides an economic priority control strategy by combining a power supply price change policy and other favorable economic policies, and achieves a control target of increasing the comprehensive economic efficiency of users.
In the preferred embodiment of the power balance system based on the distributed power generation system, when the power supply power P is suppliedDIs 0, and the power generation power P of the distributed power generation systemXGreater than the load power P of the user load systemFAnd the control unit regulates the energy storage module 1 to store energy.
In a preferred embodiment of the power balance system based on the distributed power generation system, the control unit includes a determination unit for determining an instantaneous peak power or a continuous high power at the power generation site of the distributed power generation system.
In a preferred embodiment of the power balance system based on the distributed power generation system, the at least one super capacitor module 3 includes a plurality of super capacitor modules 3 connected in parallel, and the super capacitor module 3 includes a plurality of super capacitors connected in series and parallel.
In a preferred embodiment of the power balance system based on the distributed power generation system, the at least one rotating mechanical energy storage module 4 includes a plurality of rotating mechanical energy storage modules 4, and the rotating mechanical energy storage module 4 includes a plurality of rotating mechanical energy storage units connected in series and parallel.
In a preferred embodiment of the power balance system based on the distributed power generation system, the rotating mechanical energy storage unit includes an energy storage structure that realizes electric energy storage by utilizing mass body rotation potential energy adjustment.
In the preferred embodiment of the power balance system based on the distributed power generation system, the control system 2 includes a central processing unit and a display screen, etc. which are necessary hardware components for forming industrial control and a human-computer interface.
In a preferred embodiment of the power balance system based on the distributed power generation system, the at least one super capacitor module 3 stores energy with a first power, and the at least one rotating machinery energy storage module 4 stores energy with a second power, wherein the first power is greater than the second power.
In the preferred embodiment of the power balance system based on the distributed power generation system, the total energy storage capacity of the rotating mechanical energy storage module 4 is greater than that of the super capacitor module 3.
In the preferred embodiment of the power balance system based on the distributed power generation system, the real-time power relationship satisfies formula 1: pD＝PF-PX-PKEquation 1.
In the preferred embodiment of the power balance system based on the distributed power generation system, the system of the invention comprises a control system 2 and an energy storage module 1, wherein the energy storage module 1 comprises two key modules: a super capacitor module 3 and a rotating machinery energy storage module 4. The energy storage modules 1 are all in parallel connection structure, and the super capacitor modules 3 or the rotating machinery energy storage modules 4 with proper quantity can be configured according to the power balance requirement. The super capacitor module 3 mainly meets the instantaneous peak power response requirement, the rotating mechanical energy storage module 4 mainly meets the high-power continuous response requirement, and the control system 2 is an industrial integrated circuit system and is provided with an input/output interface. The control system 2 takes the power resources in the device as the regulating object by monitoring the power values of the systems shown in fig. 1 and performing real-time operation according to the target of formula 2, thereby meeting the demand of the user on the instantaneous power. In the aspect of internal control, the super capacitor module 3 and the rotating machinery energy storage module 4 have the difference in application positioning, the super capacitor module 3 responds fast, mainly solves the problem of rapidity, the rotating machinery energy storage module 4 has large energy storage space, mainly solves the problem of large capacity, absorbs the power output of the super capacitor module 3 at a slower speed in the adjusting process, and makes it reserve as much power margin as possible for responding to the next regulation and control requirement. Control system 2 power balance control objective is as in equation 2, i.e. grid power minimization:
PK＝min(f(PD) Equation 2).
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A power balancing system based on a distributed power generation system, comprising,
an energy storage module, which comprises a power module,
at least one super capacitor module for storing energy based on transient peak power response,
at least one rotating mechanical energy storage module to store energy based on sustained high power response, the rotating mechanical energy storage module being in parallel with the super capacitor module,
one end of the control system is connected with the distributed power generation system, the public power supply network and the user load system, the other end of the control system is connected with the energy storage module, the control system comprises,
a monitoring unit for real-time monitoring the generated power P of the distributed power supplyXPower supply power P of public power supply networkDAnd the load power P of the user load systemF，
The control unit is connected with the monitoring unit and the energy storage module and is based on the generated power P of the distributed power generation systemXPower supply power P of public power supply networkDAnd the load power P of the user load systemFTo adjust the generating power P of the energy storage moduleKOr store energy, wherein PD＝PF-PX-PK。
2. The distributed power generation system based power of claim 1A balancing system, wherein preferably the control unit is based on the generated power P of the distributed generation systemXPower supply power P of public power supply networkDAnd the load power P of the user load systemFTo adjust the generating power P of the energy storage moduleKSo that the power supply power P of the public power supply networkDAnd (4) minimizing.
3. The distributed power generation system based power balancing system of claim 1, wherein when the supply power P is presentDIs 0, and the power generation power P of the distributed power generation systemXLoad power P unequal to user load systemFAnd when the energy storage module is used, the control unit adjusts the energy storage module to store energy or generate electricity.
4. The distributed power generation system based power balancing system of claim 3, wherein the control unit comprises a determination unit that determines an instantaneous peak power or a sustained high power at the distributed power generation system.
5. The distributed power generation system based power balancing system of claim 1, wherein the at least one ultracapacitor module comprises a plurality of ultracapacitor modules connected in parallel, the ultracapacitor module comprises a plurality of ultracapacitors connected in series and parallel.
6. The distributed power generation system based power balancing system of claim 1, wherein the at least one rotating mechanical energy storage module comprises a plurality of rotating mechanical energy storage modules comprising a plurality of rotating mechanical energy storage units connected in series and parallel.
7. The distributed power generation system based power balancing system of claim 6, wherein the rotating mechanical energy storage unit comprises an energy storage structure that utilizes mass rotational potential energy modulation to enable electrical energy storage.
8. The distributed power generation system based power balancing system of claim 1, wherein the control system comprises a central processor and a display screen.
9. The distributed power generation system based power balancing system of claim 1, wherein the at least one super capacitor module stores energy at a first power and the at least one rotating mechanical energy storage module stores energy at a second power, the first power being greater than the second power.
10. The distributed power generation system based power balancing system of claim 1, wherein a total rotating mechanical energy storage module energy storage capacity is greater than the total ultracapacitor module energy storage capacity.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2017161785A1 (en) * | 2016-03-23 | 2017-09-28 | 严利容 | Method for controlling stable photovoltaic power output based on energy storage running state |
| CN111934438A (en) * | 2020-06-18 | 2020-11-13 | 浙江大学 | New energy micro-grid composite energy storage system and method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017161785A1 (en) * | 2016-03-23 | 2017-09-28 | 严利容 | Method for controlling stable photovoltaic power output based on energy storage running state |
| CN111934438A (en) * | 2020-06-18 | 2020-11-13 | 浙江大学 | New energy micro-grid composite energy storage system and method |
Non-Patent Citations (1)
| Title |
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| 朱海娜: "《太阳能应用技术》", 西安电子科技大学出版社, pages: 83 - 84 * |
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