CN105203861A - Aging test system of energy storage power station - Google Patents

Abstract

The invention discloses an aging test system for an energy storage power station, comprising: an AC power supply, the input end of which is connected to a power grid, and the AC power supply is a power supply providing a specific voltage; a voltage bus, and the output end of the AC power supply is connected to the voltage bus; N battery packs and N energy storage converters correspondingly connected to the N battery packs, the N battery packs are connected to the voltage bus through the N energy storage converters, wherein some of the N battery packs are in discharge state and discharge to the voltage bus through the corresponding energy storage converter, and the other part of the N battery packs is in the charging state and is charged from the voltage bus through the corresponding energy storage converter. The aging test system of the energy storage power station in the embodiment of the present invention can increase the production capacity, reduce the consumption of the power grid, reduce the requirement on the capacity of the power grid, and can realize the simultaneous aging test of multiple energy storage systems.

Description

Aging test system for energy storage power station

technical field

The invention relates to the technical field of energy storage power stations, in particular to an aging test system for energy storage power stations.

Background technique

With the application of large-scale energy storage power stations, the application of megawatt-level energy storage power stations is becoming more and more extensive. However, the problem of aging test of large-scale energy storage systems follows. At present, the commonly used aging test methods mainly include: (1) A high-power variable frequency AC power supply can be used to construct an aging test topology; (2) an AC power supply can be used to build a production aging test topology or a method of connecting multiple units in parallel to the grid for operation. Specifically, as shown in Figure 1, the topological structures of battery charging and battery discharging are respectively, which can simultaneously discharge to the voltage bus through the corresponding power storage converter (PCS) or simultaneously pass through the corresponding power storage converter (PCS ) is charged from the voltage bus.

The current problems are: (1) Using a high-power variable-frequency AC power supply to build an aging test topology requires the purchase of a high-power AC power supply. At present, the largest AC power supply in the market is about 500KW and occupies a large area. If the product capacity is sufficient, the Aging test will become the bottleneck of production capacity; (2) Most of the high-power AC power supply is one-way, which can only charge the battery, and the battery discharge also requires special load consumption, resulting in a waste of electric energy.

Contents of the invention

The object of the present invention is to solve one of the above-mentioned technical problems at least to a certain extent.

Therefore, an object of the present invention is to provide an aging test system for an energy storage power station. The system can increase production capacity, reduce power grid consumption, reduce requirements on power grid capacity, and can realize simultaneous aging tests of multiple energy storage systems.

In order to achieve the above purpose, the aging test system of an energy storage power station in an embodiment of the present invention includes: an AC power supply, the input end of which is connected to the power grid, and the AC power supply provides a power supply of a specific voltage; a voltage bus, the The output end of the AC power supply is connected to the voltage bus; N battery packs and N energy storage converters correspondingly connected to the N battery packs, and the N battery packs are converted through the N energy storage converters. The inverter is connected to the voltage bus, wherein, some of the battery packs in the N battery packs are in the discharge state and discharge to the voltage bus bar through the corresponding energy storage converters, and the other part of the battery packs in the N battery packs The groups are in charging state and are charged from said voltage bus through corresponding energy storage converters.

In addition, the aging test system of the energy storage power station according to the embodiment of the present invention also has the following additional technical features:

The N is an even number, and the powers of the N energy storage converters are all equal, wherein, the N/2 battery packs are in a discharging state, and the N/2 battery packs are in a charging state. In this way, the consumption on the grid is almost zero.

The aging test system of the energy storage power station further includes: a load connected to the voltage bus. Thus, the function of discharging or energy feeding back to the grid can be realized through load consumption.

The aging test system of the energy storage power station further includes: a transformer, through which the output end of the AC power supply is connected to the voltage bus. Thus, the AC power supply can provide the required voltage support for the voltage bus through the transformer.

The AC power supply is a bidirectional AC power supply.

When the powers of the N energy storage converters are different, the number of discharging battery groups and the number of charging battery groups are determined according to the power of the energy storage converters. Thereby, different aging test scenarios can be realized.

The N energy storage converters are connected in parallel to the voltage bus. In this way, the function that part of the battery packs can discharge to the voltage bus while the other part of the battery packs are simultaneously charged from the voltage bus can be realized.

The specific voltage is 480V.

The AC power supply is also used to feed power to the grid. Thereby, the consumption of grid energy is reduced.

The batteries in the battery pack are accumulators.

According to the aging test system of the energy storage power station according to the embodiment of the present invention, the input terminal of the AC power supply is connected to the power grid, the output terminal of the AC power supply is connected to the voltage bus, and N battery packs are connected to the voltage bus through N energy storage converters. , to construct the aging test topology of the high-power energy storage system, in which, some of the battery packs in the N battery packs are in the discharge state and discharge to the voltage bus through the corresponding energy storage converters, and the other part of the battery packs in the N battery packs It is in the charging state and charged from the voltage bus through the corresponding energy storage converter to realize partial charging and partial discharging, thereby increasing production capacity, reducing power grid consumption, reducing requirements for power grid capacity, and realizing multiple storage Ability system simultaneous aging test.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic diagram of the topology structure of an aging test system of an energy storage power station in the prior art;

Fig. 2 is a structural schematic diagram of an aging test system of an energy storage power station according to an embodiment of the present invention; and

Fig. 3 is a schematic diagram of an aging test system for an energy storage power station according to a specific embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The following describes an aging test system for an energy storage power station according to an embodiment of the present invention with reference to the accompanying drawings.

Fig. 2 is a schematic structural diagram of an aging test system for an energy storage power station according to an embodiment of the present invention. Fig. 3 is a schematic diagram of an aging test system for an energy storage power station according to a specific embodiment of the present invention.

As shown in Figures 2 and 3, the aging test system of the energy storage power station may include: an AC power source 10, a voltage bus 30, N battery packs 40, and N energy storage converters correspondingly connected to the N battery packs 40 50. Wherein, in the embodiment of the present invention, the batteries in the battery pack 40 may be secondary batteries.

Specifically, the input end of the AC power supply 10 can be connected to the power grid E, and the AC power supply 10 can be a power supply providing a specific voltage. Wherein, in an embodiment of the present invention, the specific voltage may be 480V. That is to say, in the embodiment of the present invention, if there is no device for changing the voltage, the AC power supply can be a power supply that provides a voltage of 480V. In this way, the output terminal of the AC power supply 10 can be directly connected to the voltage bus 30 with a voltage of 480V. superior.

Optionally, in an embodiment of the present invention, as shown in FIG. 3 , the aging test system of the energy storage power station may further include a transformer 20 through which the output end of the AC power source 10 may be connected to a voltage bus 30 . That is to say, as shown in FIG. 3 , the AC power source 10 can provide a voltage of 380V, which is converted into 480V by a transformer 20 and connected to a voltage bus 30 with a voltage of 480V. Thus, the AC power source 10 can provide the required voltage support for the voltage bus 30 through the transformer 20 .

As shown in FIG. 2 and FIG. 3 , N battery packs 40 can be connected to the voltage bus 30 through N energy storage converters 50 . Among them, some of the battery packs in the N battery packs 40 can be in the discharge state and discharge to the voltage bus 30 through the corresponding energy storage converter 50, and the other part of the battery packs in the N battery packs 40 can be in the charging state and pass through the corresponding energy storage converter 50. The inverter 50 is charged from the voltage bus 30 .

Further, in an embodiment of the present invention, as shown in FIG. 3 , N energy storage converters 50 may be connected to the voltage bus 30 in parallel. That is to say, the N energy storage converters 50 can be connected in parallel to the voltage bus 30 in a hand-in-hand connection. In this way, the function that some of the battery packs 40 can discharge to the voltage bus 30 and the other part of the battery packs 40 can be charged from the voltage bus 30 at the same time can be realized.

Further, in an embodiment of the present invention, N can be an even number, and the power of N energy storage converters 50 is equal, wherein, N/2 battery packs 40 are in a discharging state, and N/2 battery packs 40 40 is in charging state. That is to say, when N is an even number and the powers of the N energy storage converters 50 are equal, N/2 battery packs 40 may be in a discharging state, and N/2 battery packs 40 may be in a charging state. As a result, no energy from the grid E is consumed.

Specifically, the charge and discharge state of each battery pack 40 can be confirmed first. If the number of battery packs 40 is an even number (that is, N is an even number), then N/2 battery packs 40 can be controlled to be in a discharge state and pass the corresponding The energy storage converter 50 discharges to the voltage bus 30 , and the N/2 battery packs 40 are in a charging state and are charged from the voltage bus 30 through the corresponding energy storage converter 50 . In this way, the consumption of the grid E is almost zero.

Optionally, in an embodiment of the present invention, as shown in FIG. 2 and FIG. 3 , the aging test system of the energy storage power station may further include a load 60 , and the load 60 may be connected to the voltage bus 30 . It should be noted that, in an embodiment of the present invention, when N is an odd number and the powers of the N energy storage converters 50 are all equal, the load 60 can be used to discharge or feed energy back to the grid E. That is to say, the reflow function of charge and discharge can be realized among the N-1 battery packs 40 , and the remaining battery packs 40 can be consumed by the load 60 to discharge or feed energy back to the grid E. As a result, the consumption of the grid E is reduced.

Optionally, in an embodiment of the present invention, the AC power supply 10 may be a bidirectional AC power supply. Wherein, in the embodiment of the present invention, the AC power source 10 can also be used to feed power to the grid E. That is to say, when the AC power source 10 is a bidirectional AC power source, the AC power source 10 can realize the functions of voltage conversion and frequency conversion, and can also be used to feed power to the grid E to realize the energy feedback function. As a result, the energy consumption of the grid E is reduced.

It should be noted that, in one embodiment of the present invention, when the powers of the N energy storage converters 50 are different, the number of discharging battery groups 40 and the number of charging battery groups 40 can be determined according to the power of the energy storage converters 50 quantity. For example, five energy storage converters 50 with a power of 100KW can be charged or discharged correspondingly with one energy storage converter 50 with a power of 500KW. When the five energy storage converters 50 with a power of 100KW are in the charging state, When one energy storage converter 50 with a power of 500KW is in the discharge state, it can be determined that the number of rechargeable battery packs 40 is five, and the number of discharge battery packs 40 is one; when five energy storage converters with a power of 100KW When the inverter 50 is in the discharge state and one energy storage converter 50 with a power of 500KW is in the charge state, it can be determined that the number of the discharge battery pack 40 is 5, and the number of the rechargeable battery pack 40 is 1. Thereby, different aging test scenarios can be realized.

According to the aging test system of the energy storage power station according to the embodiment of the present invention, the input terminal of the AC power supply is connected to the power grid, the output terminal of the AC power supply is connected to the voltage bus, and N battery packs are connected to the voltage bus through N energy storage converters. , to construct the aging test topology of the high-power energy storage system, in which, some of the battery packs in the N battery packs are in the discharge state and discharge to the voltage bus through the corresponding energy storage converters, and the other part of the battery packs in the N battery packs It is in the charging state and charged from the voltage bus through the corresponding energy storage converter to realize partial charging and partial discharging, thereby increasing production capacity, reducing power grid consumption, reducing requirements for power grid capacity, and realizing multiple storage Ability system simultaneous aging test.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. an aging testing system for energy-accumulating power station, is characterized in that, comprising:

AC power, the input end access electrical network of described AC power, described AC power is for providing the power supply of specific voltage;

Voltage bus, the output terminal of described AC power accesses described voltage bus;

N number of electric battery and the N number of energy storage transverter that connect corresponding to described N number of electric battery, described N number of electric battery accesses described voltage bus by described N number of energy storage transverter, wherein, in described N number of electric battery, part electric battery is in discharge condition and is discharged to described voltage bus by corresponding energy storage transverter, and in described N number of electric battery, another part electric battery is in charged state and is charged from described voltage bus by corresponding energy storage transverter.

2. the aging testing system of energy-accumulating power station as claimed in claim 1, it is characterized in that, described N is even number, and the power of described N number of energy storage transverter is all equal, and wherein, N/2 electric battery is in discharge condition, and N/2 electric battery is in charged state.

3. the aging testing system of energy-accumulating power station as claimed in claim 1, is characterized in that, also comprise:

Load, described load is connected with described voltage bus.

4. the aging testing system of energy-accumulating power station as claimed in claim 1, is characterized in that, also comprise:

Transformer, the output terminal of described AC power accesses described voltage bus by described transformer.

5. the aging testing system of energy-accumulating power station as claimed in claim 1, it is characterized in that, described AC power is two-way exchange power supply.

6. the aging testing system of energy-accumulating power station as claimed in claim 1, is characterized in that, when the power of described N number of energy storage transverter is different, according to the quantity of power determination discharge battery group and the quantity of rechargeable battery set of energy storage transverter.

7. the aging testing system of energy-accumulating power station as claimed in claim 1, it is characterized in that, described N number of energy storage transverter accesses described voltage bus with parallel way.

8. the aging testing system of energy-accumulating power station as claimed in claim 1, it is characterized in that, described specific voltage is 480V.

9. the aging testing system of energy-accumulating power station as claimed in claim 1, it is characterized in that, described AC power is also for carrying out feed to described electrical network.

10. the aging testing system of energy-accumulating power station as claimed in claim 1, it is characterized in that, the battery in described electric battery is accumulator.