CN116435981A

CN116435981A - Control method and device of power type energy storage device

Info

Publication number: CN116435981A
Application number: CN202111651521.XA
Authority: CN
Inventors: 张卫; 张军生; 郑德化; 所罗门·尼桑特·阿莱穆; 贺哿
Original assignee: Beijing Jinfeng Zero Carbon Energy Co ltd
Current assignee: Beijing Jinfeng Zero Carbon Energy Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2023-07-14
Also published as: WO2023123677A1

Abstract

A control method and device for a power type energy storage device are provided. The power type energy storage device is connected to an inlet wire end of a second transformer through a first transformer, a power grid is connected to the inlet wire end, an outlet wire end of the second transformer is connected to a target load, and the control method comprises the following steps: controlling the power type energy storage device to be in a hot standby state in response to the power grid not having a fault; in response to a short-circuit fault of the power grid, controlling the power type energy storage device to provide short-circuit current for a fault point of the power grid so as to prevent a breaker of the power grid from being disconnected; when the circuit breaker is disconnected, the power grid is disconnected with the incoming line end.

Description

Control method and device of power type energy storage device

Technical Field

The present disclosure relates generally to the field of power technology, and more particularly, to a method and apparatus for controlling a power type energy storage device.

Background

With the development of regional zero-carbon power systems, system uncertainty and stability are increasingly challenged. Because of the high proportion of renewable energy source access, the regional zero-carbon power system is characterized by weak system moment of inertia, weak stability, weak disturbance rejection capability and weak stable recovery capability after faults occur. How to maintain the stability of the system under disturbances and faults while increasing the renewable energy penetration ratio is an important issue. Large loads or large fluctuations in distributed power supply output power, faults (such as the occurrence of a fault or the removal of a fault) can cause serious disturbances. The initial characteristics of the fault and the transient dynamic disturbance have similarity, and the disturbance and the fault condition should be accurately distinguished. For disturbance, a micro-grid dynamic disturbance and transient disturbance control system should be accurately identified, and a fault detection signal is quickly returned to a normal value, so that the circuit breaker is ensured not to trip; for faults, the fault detection signal will remain at a value that differs greatly from conventional ones and for a longer period of time, the fault protection system should accurately trip a reasonable circuit breaker based on the location of the fault point.

There are currently a large number of precision loads requiring high power quality power supplies such as chip processing plants, hospitals, and high precision device industrial parks. Because of the occurrence of faults, the power supply voltage of the system cannot meet the power quality requirement of the precise load within a specified time range, and huge losses are brought to enterprises and society. Therefore, how to protect delicate loads when grid faults occur is an important technical and economic issue currently faced.

As the current zero-carbon power system is just in the starting stage, the penetration ratio of the new energy gradually increases along with the massive access of the new energy. Compared with the traditional regional power system with a large number of rotary spare parts, the problem of voltage flicker caused by faults is more remarkable, and the damage to precision load production is more obvious and frequent. One of the existing solutions is mainly to add a rotary heat self-contained power plant to a precision load processing enterprise or park, but the method is high in cost and high in emission, and has no economic value and social popularization significance. In the second prior art, an Uninterruptible Power Supply (UPS) is added at a precise load end, the UPS can supply power for the precise load in a short time when a power grid is in power failure, however, most of the current UPS is a lead-carbon battery or a lithium battery, has practicability as an emergency small-load standby power supply, and has low economical efficiency when facing a large number of heavy precise loads. And secondly, the capacity and the operation mode of the UPS cannot solve the problems of voltage flicker and short interruption of load end voltage caused by regional power grid faults, and cannot protect precise loads. In the third prior art, the power quality is improved through reactive compensation or active filtering equipment, however, the method is generally aimed at the situation of insufficient reactive power or voltage drop caused by load, and cannot solve the problems of power voltage flicker and short-time interruption caused by fault, and the safe and stable operation of precise load cannot be ensured.

Disclosure of Invention

Exemplary embodiments of the present disclosure provide a control method and apparatus of a power type energy storage device, which can effectively secure power supply stability of a target load (e.g., a precision load).

According to a first aspect of embodiments of the present disclosure, there is provided a control method of a power type energy storage device, the power type energy storage device being connected to an inlet wire end of a second transformer via a first transformer, a power grid being connected to the inlet wire end, an outlet wire end of the second transformer being connected to a target load, wherein the control method includes: controlling the power type energy storage device to be in a hot standby state in response to the power grid not having a fault; in response to a short-circuit fault of the power grid, controlling the power type energy storage device to provide short-circuit current for a fault point of the power grid so as to prevent a breaker of the power grid from being disconnected; when the circuit breaker is disconnected, the power grid is disconnected with the incoming line end.

According to a second aspect of the embodiments of the present disclosure, there is provided a control device of a power type energy storage device, the power type energy storage device being connected to an inlet wire end of a second transformer via a first transformer, a power grid being connected to the inlet wire end, an outlet wire end of the second transformer being connected to a target load, wherein the control device includes: a hot standby control unit configured to control the power type energy storage device to be in a hot standby state in response to the grid not being failed; a fault response control unit configured to control the power type energy storage device to provide a short circuit current for a fault point of the power grid in response to occurrence of a short circuit fault of the power grid so as to avoid disconnection of a breaker of the power grid; when the circuit breaker is disconnected, the power grid is disconnected with the incoming line end.

According to a third aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the method of controlling a power type energy storage device as described above.

According to a fourth aspect of embodiments of the present disclosure, there is provided a control device of a power type energy storage device, the control device including: a processor; and a memory storing a computer program which, when executed by the processor, causes the processor to perform the method of controlling the power storage device as described above.

According to the control method and the control device of the power type energy storage device, the power type energy storage device with good economic performance is controlled, so that the target load is protected when the power grid fails, the target load is ensured to be uninterrupted, and the power supply stability of the target load is improved. For example, in the event of a fault in a regional zero-carbon power system, the precision load is protected.

Additional aspects and/or advantages of the present general inventive concept 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 general inventive concept.

Drawings

The foregoing and other objects and features of exemplary embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate the embodiments by way of example, in which:

FIG. 1 illustrates an example of a topology of a regional zero-carbon power system according to an exemplary embodiment of the present disclosure;

FIG. 2 illustrates an example of a positive sequence equivalence circuit diagram after a fault occurs in accordance with an exemplary embodiment of the present disclosure;

FIG. 3 illustrates an example of a negative sequence equivalence circuit diagram after a fault occurs in accordance with an exemplary embodiment of the present disclosure;

FIG. 4 illustrates an example of a zero sequence network architecture diagram after a fault occurs in accordance with an exemplary embodiment of the present disclosure;

FIG. 5 illustrates an example of a zero sequence network contour map after a fault occurs in accordance with an exemplary embodiment of the present disclosure;

FIG. 6 shows an example of a Thevenin equivalent circuit diagram of positive, negative and zero sequence according to an exemplary embodiment of the present disclosure;

FIG. 7 illustrates an example of a composite sequence net contour map of a single phase short circuit fault in accordance with an exemplary embodiment of the present disclosure;

fig. 8 illustrates a flowchart of a control method of a power type energy storage device according to an exemplary embodiment of the present disclosure;

fig. 9 illustrates an example of a topology of a power-containing energy storage device according to an exemplary embodiment of the present disclosure;

FIG. 10 illustrates an example of a target load protection scheme positive sequence contour map for a power-containing energy storage device according to an exemplary embodiment of the present disclosure;

FIG. 11 illustrates an example of a negative sequence contour map of a target load protection scheme for a power-containing energy storage device according to an exemplary embodiment of the present disclosure;

FIG. 12 illustrates an example of a target load protection scheme zero sequence contour map for a power-containing energy storage device according to an exemplary embodiment of the present disclosure;

FIG. 13 illustrates an example of a simplified contour diagram of a target load protection scheme for a power-containing energy storage device according to an exemplary embodiment of the present disclosure;

fig. 14 illustrates an example of voltage and current curves of a power type energy storage device according to an exemplary embodiment of the present disclosure;

fig. 15 illustrates an example of a stationary synchronous dimmer state of a power type energy storage device according to an exemplary embodiment of the present disclosure;

fig. 16 illustrates an example of a transient response of a power-type energy storage device according to an example embodiment of the present disclosure;

FIG. 17 illustrates examples of transient responses of a power-type energy storage device at different events according to an exemplary embodiment of the present disclosure;

fig. 18 illustrates a hot standby control example of a power storage device according to an exemplary embodiment of the present disclosure;

Fig. 19 illustrates a full cycle control example of a power type energy storage device according to an exemplary embodiment of the present disclosure;

fig. 20 illustrates a block diagram of a control device of a power type energy storage device according to an exemplary embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments will be described below in order to explain the present disclosure by referring to the figures.

Fig. 1 illustrates an example of a topology of a regional zero-carbon power system according to an exemplary embodiment of the present disclosure.

As shown in fig. 1, the regional zero-carbon power system is mainly a local power system with the voltage level below 220kV, and the rest is mainly composed of zero-carbon local power systems such as loads, large-scale renewable energy sources, energy storage, micro-grid groups and the like except for a traditional power system and a transformer substation. T-1, T-2, T-3, T-4 denote transformers, LD denote load and/or reactive compensation equipment.

The regional zero-carbon power system mainly comprises large-scale new energy sources, energy storage, fuel cells, loads and the like in the region. These elements are connected to the conventional power system mainly by way of regional autonomous micro-grid clusters. The traditional power system forms a 220kV power interconnecting line through a transformer substation. The area contains more than two micro-grid groups, high-proportion zero-carbon power generation equipment and energy storage are integrated in the micro-grid groups, and the tail end of the line is connected to a target load (for example, a precision load park) needing stable power supply through a special line.

Each node in the regional zero-carbon power system topology shown in fig. 1 is explained below, node 1 representing an infinite power system node because the regional zero-carbon power system, which is dominated by new energy, has a smaller capacity relative to a large grid. Node 2 represents a substation outlet node, which is typically at a voltage level of 35kV to 110kV for regional zero-carbon power systems. Node 3 is a precision load outlet node, and is typically powered by a dedicated line alone. The line between the node 2 and the node 3 can be a single-loop line or a double-loop power supply line to improve the power supply stability. Node 4 is a medium and low voltage node for precision loads, typically 10kV. Node 5 is the grid-connected point where the micro-grid 1 is located, and node 6 is the grid-connected point where the micro-grid 2 is located.

It should be understood that the scope of the present disclosure is not limited to 110kV for substation voltage, and is applicable to other voltage levels such as 220kV and 35kV for substation outlet voltage. The protection scope in the present disclosure is not limited to a single-circuit power supply line, but also includes a double-circuit power supply line, a ring network power supply line structure form, a radial area structure, and the like. Meanwhile, the voltage level of the load node is not limited to 10kV, and the load node is still applicable to other nodes meeting the medium-low voltage level specification. The regional zero-carbon power system disclosed by the disclosure is not limited to 2 micro-grids, and is still applicable to regional power systems constructed by single micro-grids or multiple micro-grids.

The precision load has very high requirements on power supply stability, for example, chip processing equipment, a photoetching machine, silicon purification equipment and the like require that the voltage cannot be interrupted, and the voltage needs to be maintained within a specified range. The present disclosure contemplates f if a fault occurs between node 4 and node 3 ₀ Location (i.e., fault point) for ease of illustration, the regional zero-carbon power system topology described above is modeled with equal value, as shown in fig. 2. Firstly, carrying out per unit value calculation on important elements such as a line, a transformer, a power supply, a load and the like, wherein the calculated result is represented as generator port voltage G by parameters ₁ The star impedance of the high-voltage side of the transformer T-1 is X _T-11 The star impedance of the low-voltage side of the transformer T-1 is X _T-12 The low-voltage side angle impedance of the transformer T-1 is X _T-13 The impedance of the transmission line between the equivalent generator and the three-winding transformer T-1 is X ₁ The impedance between the low-voltage star connection side of the three-winding transformer T-1 and the node 2 is X ₂ The impedance of the distribution line between the nodes 2 and 3 is X ₃ The impedance of the special line from the node 3 to the high-voltage side of the transformer T-2 of the precise load park is X ₄ The line impedance from the low-voltage corner joint side of the T-2 transformer to the park load is X ₅ The equivalent impedance of the transformer T-2 is X _T-2 The equivalent impedance of the transformer T-3 is X _T-3 The equivalent impedance of the transformer T-4 is X _T-4 The line impedance between node 5 and transformer T-3 is X ₆ The line impedance between node 6 and transformer T-4 is X ₇ The equivalent impedance of LD is X _LD1 Equivalent impedance of park load is X _LD2 The potentials of the two micro-grids are denoted as E respectively _m1 And E is _m2 The impedance of the two micro-grids is denoted as X _m1 And X _m2 。

The equivalent circuit of the positive sequence network should include neutral point-removed grounding impedance and no-load circuitAnd all power system components except the no-load transformer. Since no-load line and no-load transformer are shown in FIG. 1, the whole system is further analyzed, optimized and calculated to obtain a positive sequence network diagram of the system as shown in FIG. 2, wherein U _a1 Representing the positive sequence voltage value, the positive sequence network is an active network as seen from the fault point.

The following analysis is performed on the fault of the regional zero-carbon power system: the elements through which negative sequence currents can flow in the negative sequence equivalent circuit diagram are considered to be the same as the positive sequence, but all the power supply negative sequence potentials are zero. Accordingly, a negative sequence equivalent circuit diagram after the occurrence of faults can be synchronously obtained as shown in FIG. 3, wherein U _a2 Representing the negative sequence voltage value, the negative sequence network is observed from the fault point to be a passive network.

Zero sequence fault current must occur when a system fails in a non-three phase manner. Thus, zero sequence potential representing the occurrence of a fault is applied at the short circuit point, and the zero sequence current is the same in magnitude and phase, and must pass through the earth to form a path. The zero sequence current loop must be associated with neutral grounded components, and for 110kV and above voltage levels, direct grounding is generally used, the grounding resistance can be ignored, U ₀ Representing the zero sequence voltage. Accordingly, the zero sequence equivalent circuit after the fault is generated can be obtained as shown in fig. 4 and 5.

In order to quantitatively calculate the fault current and the voltage under the fault, the equivalent calculation is performed on the positive sequence network, the negative sequence network and the zero sequence network. The equivalent calculation is shown in fig. 6. The most common fault type is also the highest frequency of single-phase ground transient short-circuit faults in an actual power system. When a single-phase earth fault occurs at the fault point shown in fig. 1, the following relationship is provided:

wherein,,

represents the short-circuited phase (i.e. failed phase) voltage, +.>

And->

Representing non-short-circuited phase current, equation (1) can be expressed according to the rule of symmetry components as:

wherein operator a represents a phase shift of 120 °, a=e ^j120 After calculation, equation (2) can obtain equation (3):

According to the method (3), the positive and negative zero sequence voltage U of the short-circuit phase under the single-phase short-circuit fault can be obtained _a1 、U _a2 、U _a0 The sum is equal to 0, and the positive and negative zero sequence currents I of the short-circuited phases _a1 、I _a2 、I _a0 Equal. Therefore, the equivalent circuit diagram of the single-phase short-circuit compound sequence network is shown in figure 7, and the fault current I when the single-phase short circuit occurs can be calculated _fault The method comprises the following steps:

wherein,,

representing the resultant potential, X _1∑ Representing positive sequence impedance, X _2∑ Represents negative sequence impedance, X _0∑ The zero sequence impedance is represented, the voltage of the metallic ground fault phase is 0, and the fault current is high. When the regional zero-carbon power system parameter configuration meets a certain condition, the (X) _1∑ +X _2∑ +X _0∑ ) At minimum, the fault current (i.e., short-circuit current) will be large, resulting in a grid-side circuit breaker due toTrip beyond the setting value. This can cause the T-2 transformer and the back-end precision load to be powered off, the precision load power supply cannot be guaranteed, and the process can continue until the reclosing is successful after the grid fault is cleared. However, this process may last for several hundred milliseconds or even more than a second, and the precision load is not able to bear, and the precision load thus cuts off the power supply, seriously affecting the production efficiency and the production quality.

Fig. 8 illustrates a flowchart of a control method of a power type energy storage device according to an exemplary embodiment of the present disclosure. The power type energy storage device (hereinafter, also simply referred to as power type energy storage) is connected to an inlet wire end of a second transformer via a first transformer, a power grid is connected to the inlet wire end, and an outlet wire end of the second transformer is connected to a target load. The target load may be a load requiring stable power supply. The electrical grid may comprise a micro-grid.

In order to at least solve the above-mentioned analysis problem, the present disclosure proposes to protect the target load at the moment when the grid fault occurs based on the power-type energy storage until the grid reclosing is successful. The present disclosure proposes connecting a power-type energy storage device of appropriate capacity in parallel at the incoming line end of a transformer (i.e., a second transformer) of a target load. At the moment of short-circuit fault occurrence, the power type energy storage device can rapidly respond to fault current of the power grid at millisecond speed, and at the moment of fault occurrence, current pressure of the power grid to fault points can be relieved. As in the example shown in fig. 9, T-5 represents a first transformer, T-2 represents a second transformer, and the precision load park is the target load.

As an example, the power storage device may include, but is not limited to, at least one of the following: and (5) storing energy by using a super capacitor and storing energy by using a flywheel. It should be understood that other suitable types of power-type energy storage may be included, as this disclosure is not limited in this regard.

As an example, the first transformer may be an isolated step-up transformer of a power energy storage device.

Referring back to fig. 8, in step S10, in response to the power grid not having a fault, the power type energy storage device is controlled to be in a hot standby state, so as to be capable of quickly responding to a transient fault of the power grid and guaranteeing continuous power supply of a target load.

In step S20, in response to the occurrence of a short-circuit fault in the power grid, the power energy storage device is controlled to provide a short-circuit current for a fault point of the power grid, so as to avoid disconnection of a breaker of the power grid, thereby ensuring that a target load is not powered off. When the circuit breaker is disconnected, the power grid is disconnected with the incoming line end. The circuit breaker is the circuit breaker corresponding to the fault point.

As an example, the control method of the power type energy storage device according to the exemplary embodiment of the present disclosure may further include: and responding to the disconnection of a circuit breaker of the power grid, and controlling the power type energy storage device to supply power for the target load in the process from the disconnection to reclosing of the circuit breaker.

According to the present disclosure, when a grid short-circuit fault occurs, a larger short-circuit current is not only provided by the grid, but the power type energy storage device can be controlled to provide an instantaneous short-circuit current. For transient short-circuit faults, the voltage of short-circuit current provided by the power grid side can be effectively reduced, so that a breaker at the left side of a fault point, which is close to the power grid, can not trip, or can supply power for a target load by a power type energy storage device after tripping, thereby maintaining the stability of the transient state of the target load voltage, and the power grid is restored to the normal power supply level after the fault is cleared or the power grid is successfully reclosed.

The equivalent circuits of positive sequence, negative sequence and zero sequence under the fault of the power grid are analyzed by the same method as described above and are shown in fig. 10 to 12, and according to the superposition theorem, the positive sequence, negative sequence and zero sequence simplification equivalent circuit diagram of the power source with the power type energy storage device can be shown in fig. 13. From the simplified equivalent circuit diagram, it can be seen that the short-circuit current after failure can be supplied not only by the power grid but also by the potential E of the power type energy storage device _m3 Can also provide short-circuit current I instantaneously and rapidly _sca0 、I _sca1 、I _sca2 The pressure of the power grid side to the faults is relieved, and the tripping and reclosing of the power grid caused by transient short-circuit faults can be avoided to a certain extent. As shown in FIG. 12, X _T-5 Related to the short-circuit voltage and capacity of the transformer T-5, the capacity of the transformer T-5Positive correlation with instantaneous maximum power output of power type energy storage device, X _T-5 Representing the impedance of the transformer T-5. X is X ₈ In relation to the power capacity of the power-type energy storage device, the power-type energy storage device can be used as a generator capable of responding in short time and quickly, X ₈ Representing the equivalent reactance of the generator, the greater the capacity of the power storage device, the smaller the value. Fig. 14 illustrates an example of voltage and current curves of a power type energy storage device according to an exemplary embodiment of the present disclosure, with an abscissa representing time and an ordinate representing a voltage value or a current value of the power type energy storage device. It can be seen that in the regional zero-carbon power equivalent system containing the power type energy storage device, the power type energy storage device can not only rapidly provide active power, but also rapidly provide reactive power in the transient process of short circuit fault occurrence.

With respect to step S10, as an example, the power-type energy storage device may be controlled to be in a charged state in response to the grid not being faulty and the power-type energy storage device needing to be charged; and controlling the power type energy storage device to be in a static synchronous regulation state to synchronously run with the power grid in response to the power grid not being in a fault and the power type energy storage device not being in a charging state.

When the power type energy storage device is in a static synchronous camera adjusting state, the rotating speed of the virtual magnetic field corresponding to the potential of the power type energy storage device is the same as the potential rotating speed of the power grid. Here, the virtual magnetic field is understood to mean a magnetic field which is equivalent to a virtual magnetic field based on the potential of the power energy storage device.

Further, as an example, when the power type energy storage device is in a stationary synchronous phase adjustment state, the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid are identical in phase; and the electric potential of the power type energy storage device and the electric potential of the power grid are the same in rotation direction.

As an example, the state value of the charge state of the power storage device may be lower than a first threshold SOC in response to the grid not failing _min Controlling the power type energy storage device to enter a charging state; responsive to saidThe power type energy storage device is in a charging state, and the state value of the charging state reaches a second threshold value SOC _max And controlling the power type energy storage device to enter a static synchronous camera adjusting state. And under the condition that the state value of the charge state of the power type energy storage device reaches a first threshold value, the power type energy storage device responds to the fault of the power grid and continues until the state value of the charge state after the fault is cleared is not lower than a lowest threshold value. SOC (State of Charge) _min Rather than referring to the lowest state of charge (i.e., the lowest threshold) to which the power-type energy storage device can operate, it is possible to transient respond to a grid fault and transition to a state of charge in which the power-type energy storage device will not fall below the lowest SOC value after the fault clearing, i.e., a state of charge sufficient to cope with the grid fault.

The control method of the power type energy storage device provided by the disclosure not only has the characteristic of quick transient response, but also can solve the problem of cold standby caused by too low or too high energy storage discharging SOC (state of charge). The power type energy storage device can be always in a hot standby state, real-time quick response under the fault condition can be ensured under the state, and meanwhile, the frequency and voltage stability under the normal operation of a power grid are not influenced.

As an example, when the power type energy storage device is operating in a normal state, and the SOC _min <When the state of charge (SOC) is the current state, the running state of the power type energy storage device is similar to a static synchronous regulator, and the power grid fault or the occurrence of voltage frequency abrupt change is waited at any time. The term "synchronous" is used herein to mean that the mechanical rotor rotation speed is not the same as the stator magnetic field rotation speed, but that the power storage device has an active power output or absorption capacity of seconds or even minutes, and is capable of forming a virtual rotary flux linkage by the power electronics, and that the power storage device is capable of operating in the SOC range (i.e., higher than SOC _min ) The flux linkage can be controlled to have the same rotation speed as the flux linkage formed by the electricity of the power grid. However, the power type energy storage device is called a stationary synchronous camera state because it does not substantially rotate.

At the SOC of the interval, a method of controlling the power storage device may be described with reference to fig. 15, in which,

representing the power factor angle, delta, of a power type energy storage device _sc Representing the power angle of the power type energy storage device, +.>

Representing the internal potential of the power storage device, +.>

Representing the voltage of the power type energy storage device, R _sc Representing the resistance between the power type energy storage device and the power grid, < >>

Representing the current of a power type energy storage device, X _sc Representing the reactance between the power storage device and the grid. As an example, the present disclosure also considers the isolation transformer T-5 and its line impedance, which are interconnected with the grid, when controlling the power storage device, i.e. the isolation transformer and the line impedance are reduced into the control system and considered as R _sc +jX _sc . Fig. 15 (a) depicts the power storage device outlet three-phase voltage U _sca ，U _scb U and U _scc And regional power grid E _a ，E _b E and E _c The phase relationship between (e.g., the voltage at node 3) and the direction of rotation of the potential can be synchronized with the grid by controlling the virtual magnetic field rotation speed of the power storage device. Because the power type energy storage device has bi-directional capacity standby in the second level and even in the minute level, a virtual rotating magnetic field exists all the time, and even if the power type energy storage device is disconnected from a power grid, the virtual rotating magnetic field can still exist for a certain time. There is little power exchange between the power type energy storage device and the grid when in the stationary synchronous camera-adjusting state.

As an example, the control method of the power type energy storage device according to the exemplary embodiment of the present disclosure may further include: in response to the power grid not being failed, controlling according to the reactive consumption upper limit value of the target load And controlling the reactive power output by the power type energy storage device by controlling the potential of the power type energy storage device so as to improve the power factor of a target load. Fig. 15 (b) depicts the potential by controlling the power storage device

The magnitude of the reactive power is controlled, thereby achieving the effect of improving the power factor of the precise load park. Fig. 15 (c) depicts the potential +_ by controlling the power storage device>

And becomes smaller to reduce its reactive power output.

With respect to step S20, as an example, the step of controlling the power type energy storage device to provide a short circuit current to a fault point of the power grid may include: controlling the three-phase voltage of the power type energy storage device according to a first target reference voltage value; and/or controlling a power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid according to a target reference power angle value; and/or controlling the rotating speed of the virtual magnetic field corresponding to the potential of the power type energy storage device according to a target reference rotating speed value, wherein the target reference rotating speed value is the rotating speed of the virtual magnetic field when the power grid fails. For example, the first target reference voltage value may be a voltage value set in advance according to actual conditions and demands. For example, the target reference power angle value may be a power angle value set in advance according to actual conditions and demands.

As an example, the magnitude of the short-circuit current provided for the fault point of the grid may be determined by: the three-phase voltage of the power grid, the three-phase voltage of the power type energy storage device, a power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid, the power factor of the target load, the active power output by the power grid and the reactive power output by the power grid.

As an example, the magnitude of the active power output by the grid may be determined by: the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid, the reactance of a system corresponding to the power type energy storage device, the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid. The system corresponding to the power type energy storage device comprises: the power type energy storage device, a circuit for connecting the power type energy storage device to the wire inlet end and a first transformer.

As an example, the magnitude of the reactive power output by the grid may be determined by: the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid, the reactance of a system corresponding to the power type energy storage device, the three-phase voltage of the power grid and the resistance of the system corresponding to the power type energy storage device.

As an example, the control method of the power type energy storage device according to the exemplary embodiment of the present disclosure may further include: and determining that the power grid has a short circuit fault in response to a power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid exceeding a power angle threshold or a potential rotation speed change rate of the power grid exceeding a rotation speed change rate threshold. According to the embodiment, the power grid short-circuit fault can be accurately identified.

As an example, when a power-type energy storage device is required as dynamic active power as well as reactive power support due to an event (failure) of a regional power system, the present disclosure proposes that the power-type energy storage device can be adjusted to an external transient response mode by detecting an instantaneous large change in the regional power grid potential rotation speed in real time to control the power-type energy storage device to provide a short-circuit current for the failure point of the power grid. The minimum time of transient response is within 0-50 ms, and the dynamic response time is within the range of seconds.

Considering that the power electronic equipment can have 2 times overload capacity in a short time, the control method of the external transient response mode can be as shown in fig. 16, wherein U is shown in fig. (a) _sca ，U _scb U and U _scc Potential rotation speed of power type energy storage device at moment of occurrence of event (fault) and power grid E at moment of transient state _a ，E _b E and E _c Is significantly low in rotation speedIn U _sca ，U _scb U and U _scc This causes a large transient power angle between the power type energy storage device outlet voltage and the grid voltage, controlling the power type energy storage device transient current to increase and the power to increase. Fig. 16 (b) shows the regulation of system frequency fluctuation or voltage fluctuation in the allowable range under normal operation, and fig. 16 (c) shows a transient vector diagram of a large abnormality of the grid frequency, voltage drop, which occurs in an event.

As an example, when it is detected that the power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid exceeds the power angle threshold, the transient output current of the power type energy storage device (i.e., the fault current when the fault occurs) may be determined according to the voltage of the power type energy storage device, the power grid voltage, the transient power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid, the power factor of the target load, the active power output and the reactive power output correspondence model relationship of the power type energy storage device, which are shown in (c) of fig. 16. Comparing the active outputs P in (b) and (c) in FIG. 16 _sc And reactive power output Q _sc The average ratio (b) is greatly increased. In the disclosure, voltage amplitude control of the power type energy storage device can be adjusted in real time according to power angle detection changes, different fault types and fault severity correspond to different power angles and different voltage amplitudes, and corresponding transient active power and transient reactive power are output according to different fault types and fault severity.

As an example, the active power output model of a power energy storage device may be expressed as:

the reactive power output model of the power storage device may be expressed as:

wherein P represents active power output, Q represents reactive power output, delta represents power angle, X representsThe reactance of a system corresponding to the power type energy storage device is shown, R represents the resistance of the system corresponding to the power type energy storage device, and g ^P (Ea) represents a function of the control activity in relation to the grid voltage, g ^Q (R, delta) represents a function of control reactive related to equivalent resistance and power angle.

Fig. 17 illustrates examples of transient responses of a power-type energy storage device at different events according to an exemplary embodiment of the present disclosure. Fig. 17 (a) may depict a type of grid fault that requires both a power storage device to compensate for a significant amount of reactive power and a power storage device to compensate for a significant amount of active power, which corresponds to the fault occurring at a location near the target load side power system. The (b) of fig. 17 can describe the situation that the power grid occurs, the voltage drop of the power grid is large, and the reactive power compensation is mainly required by the power type energy storage device, i.e. a large amount of reactive power can be emitted at the moment of failure, i.e. Q _sc2 >Q _sc1 >Q _sc3 . Fig. 17 (c) shows a situation that the electric potential rotation speed of the regional power grid is obviously lower than the virtual flux linkage rotation speed of the power type energy storage device after the fault occurs, and the power type energy storage device emits transient active power and current. Corresponding to the active power which needs to be supplemented by the power type energy storage device in the transient process under the fault occurrence, P _sc3 >P _sc2 >P _sc1 。

The present disclosure contemplates: due to the presence of the resistor on the line, the power factor of the power storage device cannot be controlled to 0 under the conditions (b) and (c) in fig. 18, i.e.

The value cannot be 90 °. Because of the active loss (although small) on the line, the SOC value of the power storage device is slowly reduced to SOC as the device operates _min The following is given. Second, there is active power loss after the power type energy storage device completes fault handling of regional power grid, and the SOC value may be quickly reduced to SOC _min The following is given. Therefore, in order to meet the full-time hot standby, the present disclosure ensures the safety of the target load, and the control method of the power energy storage device may be as follows:

as an example, to maintain hot standby of the power storage device, the power storage device SOC is reduced to SOC _min In the following, the power type energy storage device is started to enter the control stage. As can be seen from fig. 18 (a), the virtual flux linkage rotational speed of the controllable power storage device is slightly lower than the rotational speed of the regional power grid. If the angle is controlled

Equal to 90 °, which corresponds exactly to (b) in fig. 18, the power storage device absorbs a certain active power. When the power factor angle enters the third quadrant, the power type energy storage device can absorb more active power, and the hot standby efficiency is improved. Since the power type energy storage device has a rapid charge and discharge speed, the stage can be completed in a period of a few seconds, and the next target load protection preparation is quickly carried out. According to the embodiment, the hot standby efficiency of the power type energy storage device can be improved, the event transient response mode is ensured to be entered under the fault occurrence at any time, and the normal operation of the target load is ensured.

As an example, the step of controlling the power storage device to be in a charged state may include: controlling a power angle between a three-phase voltage of the power grid and a three-phase voltage of the power type energy storage device to be greater than zero and to change with a charge state of the power type energy storage device; wherein the higher the state value of the charge state, the smaller the power angle.

Fig. 19 illustrates a full cycle control example of a power type energy storage device according to an exemplary embodiment of the present disclosure. As shown in fig. 19, the disclosure further proposes a time-varying control method for transient current fast response and power-type energy storage hot standby control of several states of the power-type energy storage device in a stationary synchronous phase-change machine. As shown in fig. 19, the time coordinate dimension is increased (more practical significance) by considering the flux linkage rotation speed difference between the power type energy storage device and the power grid and the two dimensions of the SOC. The AB curve on the left side of FIG. 19 shows the power type energy storage device in the hot standby preparation phase, delta being positive indicates that the three phase voltage of the power grid is rotating faster than the power type energy storage device, power typeThe lower the storage SOC, the greater the delta value setting. As time increases and SOC gradually approaches a maximum value, the delta value approaches 0. When the SOC reaches the SOC _max And when the camera is switched to the static synchronous camera adjusting mode. The mathematical description corresponding to the control of the AB process may be f (δ) =g (SOC, t), with a time constraint of t ₁ Smaller, typically in the order of seconds.

In synchronous camera mode (corresponding to BC phase), the delta value is always 0 and the SOC curve is only a function of time, with slow decrease in SOC over time. The mathematical description in this process may be f (SOC) =g (t), and the constraint is t ₂ -t ₁ ＞＞t ₁ 。

When the SOC gradually drops to the SOC _min When a jump occurs into the CD phase, the hot standby preparation phase. The power type energy storage device is kept in a ready state by the circulation until a new event occurs in the system. The right graph in fig. 19 depicts the process of a regional system failure, a rapid action of the power storage device in response to the failure, ensuring a stable power supply to the load. The A 'B' phase is identical to the AB phase in character and will not be described in detail. The mathematical description of the B 'C' process is the same as BC and will not be described in detail. The fault protection load period is D 'E', the power type energy storage device delta is a larger negative number, and the value of the power type energy storage device delta mainly depends on the potential rotation speed of the regional power grid during the fault occurrence period. The mathematical description corresponding to this process may be f (SOC) =g (t (I) _sca1 ,I _sca2 ,I _sca0 ),δ(I _sca1 ,I _sca2 ,I _sca0 ) With constraint t' ₃ -t′ ₂ About equal to the fault clearing time (typically in milliseconds), I _sca1 ,I _sca2 ,I _sca0 Representing the positive and negative zero sequence values of the fault current. At point E', the fault clears and the target load is protected. And after the power type energy storage device detects that the electric network potential rotation speed is recovered, the power type energy storage device quickly returns to a hot standby preparation stage. The process thereafter is as the left side in fig. 19 and will not be described in detail.

Further, as an example, the control method of the power type energy storage device according to the exemplary embodiment of the present disclosure may further include: and responding to the disconnection of a circuit breaker of the power grid, and controlling the power type energy storage device to supply power for the target load in the process from the disconnection to reclosing of the circuit breaker.

As an example, the three-phase voltage of the power type energy storage device may be controlled according to a second target reference voltage value during the process from opening to reclosing of the circuit breaker; and/or controlling the rotation speed of the virtual magnetic field corresponding to the potential of the power type energy storage device according to the target reference rotation speed value; the target reference rotating speed value is the rotating speed of the virtual magnetic field when the power grid fails. For example, the second target reference voltage value may be a voltage value set in advance according to actual conditions and demands.

According to the exemplary embodiments of the present disclosure, at least the following advantageous effects can be brought about:

1. according to the method, by introducing the power type energy storage (super capacitor energy storage, flywheel energy storage and the like) with good economic performance, the precise load is protected under the condition that a regional zero-carbon power system fails, the precise load is protected from being powered off, the power supply stability is improved, and the protection measure of the power type energy storage device on the precise load is provided. The types of faults addressed by the present disclosure may include transient faults (quick recloses) common to power systems, including metallic and non-metallic ground faults. The power type energy storage device does not need to add extra rotary standby for important and precise loads, and power type energy storage such as super capacitor and flywheel energy storage and the like belong to pollution-free equipment, and assist and carbon reduction are achieved.

2. In the power type energy storage device protection load scheme adopted by the disclosure, the three control modes of power type energy storage are mainly characterized by high instantaneous response speed, high instantaneous provided fault or transient current and good economical efficiency.

3. The present disclosure is based on fault analysis of regional zero-carbon power systems, evaluating that under various operating conditions, a precision load end should be equipped with a power type energy storage control method. The method mainly comprises the step of taking power type energy storage as a static synchronous camera adjusting operation method when faults do not occur. The method is beneficial to the development and popularization of the power type energy storage control system.

4. The power type energy storage system comprises the advantages that the power type energy storage system can be quickly adjusted to perform transient response under the fault occurrence condition, transient faults are responded instantaneously, and transient current and power are provided for the system. The stability of the precision load is ensured, and the productivity and the yield of products are improved.

5. The present disclosure solves the problem of cold standby of a power-type energy storage device, which has a fast response speed and a strong response robustness, however, the technical disadvantage of the power-type energy storage device is mainly short duration. The power type energy storage device and the power type energy storage method have the advantages that the external response characteristic, namely the self characteristic, of the power type energy storage device is reasonably controlled, the power type energy storage device is kept to be always operated in a reasonable electric quantity interval, real-time response to unforeseen faults is achieved, and stability of precise loads is ensured.

6. The time-varying control method for the power type energy storage device in the static synchronous camera, the transient current quick response under the fault and the power type energy storage hot standby control has practical application value.

Fig. 20 illustrates a block diagram of a control device of a power type energy storage device according to an exemplary embodiment of the present disclosure. The power type energy storage device is connected to an inlet wire end of a second transformer through a first transformer, a power grid is connected to the inlet wire end, and an outlet wire end of the second transformer is connected to a target load.

As shown in fig. 20, a control device of a power type energy storage device according to an exemplary embodiment of the present disclosure includes: a hot standby control unit 10 and a fault response control unit 20.

Specifically, the hot standby control unit 10 is configured to control the power type energy storage device to be in a hot standby state in response to the grid not being faulty.

The fault response control unit 20 is configured to control the power storage device to provide a short circuit current to a fault point of the electrical grid in response to a short circuit fault occurring in the electrical grid, to avoid a circuit breaker of the electrical grid to open. When the circuit breaker is disconnected, the power grid is disconnected with the incoming line end.

As an example, hot standby control unit 10 may be configured to: controlling the power type energy storage device to be in a charging state in response to the power grid not having a fault and the power type energy storage device needing to be charged; controlling the power type energy storage device to be in a static synchronous regulation state in response to the power grid not being in a fault and the power type energy storage device not being in a charging state; when the power type energy storage device is in a static synchronous camera adjusting state, the rotating speed of the virtual magnetic field corresponding to the potential of the power type energy storage device is the same as the potential rotating speed of the power grid.

As an example, when the power type energy storage device is in a stationary synchronous phase adjustment state, the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid are identical in phase; and the electric potential of the power type energy storage device and the electric potential of the power grid are the same in rotation direction.

As an example, the fault response control unit 20 may be further configured to: and determining that the power grid has a short circuit fault in response to a power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid exceeding a power angle threshold or a potential rotation speed change rate of the power grid exceeding a rotation speed change rate threshold.

As an example, the fault response control unit 20 may be configured to: controlling the three-phase voltage of the power type energy storage device according to a first target reference voltage value; and/or controlling a power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid according to a target reference power angle value; and/or controlling the rotating speed of the virtual magnetic field corresponding to the potential of the power type energy storage device according to a target reference rotating speed value, wherein the target reference rotating speed value is the rotating speed of the virtual magnetic field when the power grid fails.

As an example, the magnitude of the active power output by the grid may be determined by: the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid, the reactance of a system corresponding to the power type energy storage device, the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid.

The system corresponding to the power type energy storage device comprises: the power type energy storage device, a circuit for connecting the power type energy storage device to the wire inlet end and a first transformer.

As an example, the fault response control unit 20 may be further configured to: and responding to the disconnection of a circuit breaker of the power grid, and controlling the power type energy storage device to supply power for the target load in the process from the disconnection to reclosing of the circuit breaker.

As an example, the fault response control unit 20 may be configured to: in the process from the disconnection to reclosing of the circuit breaker, controlling the three-phase voltage of the power type energy storage device according to a second target reference voltage value; and/or controlling the rotation speed of the virtual magnetic field corresponding to the potential of the power type energy storage device according to the target reference rotation speed value; the target reference rotating speed value is the rotating speed of the virtual magnetic field when the power grid fails.

As an example, hot standby control unit 10 may be configured to: controlling the power type energy storage device to enter a charging state in response to the power grid not having a fault and a state value of a charging state of the power type energy storage device being below a first threshold; controlling the power type energy storage device to enter a static synchronous camera adjusting state in response to the power type energy storage device being in a charging state and a state value of the charging state reaching a second threshold value; and under the condition that the state value of the charge state of the power type energy storage device reaches a first threshold value, the power type energy storage device responds to the fault of the power grid and continues until the state value of the charge state after the fault is cleared is not lower than a lowest threshold value.

As an example, hot standby control unit 10 may be configured to: controlling a power angle between the three-phase voltage of the power grid and the three-phase voltage of the power type energy storage device to be greater than zero and to change with the charge state of the power type energy storage device so as to control the power type energy storage device to be in a charge state; wherein the higher the state value of the charge state, the smaller the power angle.

As an example, hot standby control unit 10 may be configured to: and controlling the reactive power output by the power type energy storage device by controlling the potential of the power type energy storage device according to the reactive power consumption upper limit value of the target load in response to the power grid not being failed.

As an example, the electrical grid may comprise a micro-grid.

It should be appreciated that specific processes performed by the control device of the power type energy storage device according to the exemplary embodiment of the present disclosure have been described in detail with reference to fig. 1 to 19, and related details will not be repeated here.

It should be understood that each unit in the control device of the power type energy storage device according to the exemplary embodiments of the present disclosure may be implemented as a hardware component and/or a software component. The individual units may be implemented, for example, using a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), depending on the processing performed by the individual units as defined.

Exemplary embodiments of the present disclosure provide a computer readable storage medium storing a computer program, which when executed by a processor, causes the processor to perform the method of controlling a power type energy storage device as described in the above exemplary embodiments. The computer readable storage medium is any data storage device that can store data which can be read by a computer system. Examples of the computer readable storage medium include: read-only memory, random access memory, compact disc read-only, magnetic tape, floppy disk, optical data storage device, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).

The control device of a power type energy storage device according to an exemplary embodiment of the present disclosure includes: a processor (not shown) and a memory (not shown), wherein the memory stores a computer program which, when executed by the processor, causes the processor to perform the method of controlling a power storage device as described in the above exemplary embodiments. As an example, the electronic device may be a controller of a wind turbine or a converter (e.g. a controller of a converter).

Although a few exemplary embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

Claims

1. A control method of a power type energy storage device, wherein the power type energy storage device is connected to an inlet wire end of a second transformer via a first transformer, a power grid is connected to the inlet wire end, and an outlet wire end of the second transformer is connected to a target load, wherein the control method comprises:

controlling the power type energy storage device to be in a hot standby state in response to the power grid not having a fault;

in response to a short-circuit fault of the power grid, controlling the power type energy storage device to provide short-circuit current for a fault point of the power grid so as to prevent a breaker of the power grid from being disconnected;

when the circuit breaker is disconnected, the power grid is disconnected with the incoming line end.

2. The control method of claim 1, wherein the step of controlling the power storage device in a hot standby state in response to the grid not failing comprises:

controlling the power type energy storage device to be in a charging state in response to the power grid not having a fault and the power type energy storage device needing to be charged;

controlling the power type energy storage device to be in a static synchronous regulation state in response to the power grid not being in a fault and the power type energy storage device not being in a charging state;

When the power type energy storage device is in a static synchronous camera adjusting state, the rotating speed of the virtual magnetic field corresponding to the potential of the power type energy storage device is the same as the potential rotating speed of the power grid.

3. The control method according to claim 2, wherein when the power type energy storage device is in a stationary synchronous phase adjustment state, the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid are identical in phase; and the electric potential of the power type energy storage device and the electric potential of the power grid are the same in rotation direction.

4. The control method according to claim 1, characterized in that the control method further comprises:

and determining that the power grid has a short circuit fault in response to a power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid exceeding a power angle threshold or a potential rotation speed change rate of the power grid exceeding a rotation speed change rate threshold.

5. The control method of claim 1, wherein the step of controlling the power storage device to provide a short circuit current to a fault point of the power grid comprises:

controlling the three-phase voltage of the power type energy storage device according to a first target reference voltage value;

And/or controlling a power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid according to a target reference power angle value;

and/or controlling the rotating speed of the virtual magnetic field corresponding to the potential of the power type energy storage device according to a target reference rotating speed value, wherein the target reference rotating speed value is the rotating speed of the virtual magnetic field when the power grid fails.

6. The control method according to claim 1, characterized in that the magnitude of the short-circuit current provided for the fault point of the electrical network is determined by:

the three-phase voltage of the power grid, the three-phase voltage of the power type energy storage device, a power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid, the power factor of the target load, the active power output by the power grid and the reactive power output by the power grid.

7. The control method according to claim 6, characterized in that the magnitude of the active power output by the grid is determined by: the power angle between the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid, the reactance of a system corresponding to the power type energy storage device, the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid;

The magnitude of the reactive power output by the grid is determined by: the three-phase voltage of the power type energy storage device and the three-phase voltage of the power grid, the reactance of a system corresponding to the power type energy storage device, the three-phase voltage of the power grid and the resistance of the system corresponding to the power type energy storage device;

8. The control method according to claim 1, characterized in that the control method further comprises:

and responding to the disconnection of a circuit breaker of the power grid, and controlling the power type energy storage device to supply power for the target load in the process from the disconnection to reclosing of the circuit breaker.

9. The method of claim 8, wherein during the opening to reclosing of the circuit breaker, the step of controlling the power storage device to supply power to the target load comprises:

in the process from the disconnection to reclosing of the circuit breaker, controlling the three-phase voltage of the power type energy storage device according to a second target reference voltage value; and/or controlling the rotation speed of the virtual magnetic field corresponding to the potential of the power type energy storage device according to the target reference rotation speed value;

The target reference rotating speed value is the rotating speed of the virtual magnetic field when the power grid fails.

10. The control method of claim 2, wherein the step of controlling the power storage device to be in a charged state in response to the grid not failing and the power storage device requiring charging comprises:

controlling the power type energy storage device to enter a charging state in response to the power grid not having a fault and a state value of a charging state of the power type energy storage device being below a first threshold;

controlling the power type energy storage device to enter a static synchronous camera adjusting state in response to the power type energy storage device being in a charging state and a state value of the charging state reaching a second threshold value;

and under the condition that the state value of the charge state of the power type energy storage device reaches a first threshold value, the power type energy storage device responds to the fault of the power grid and continues until the state value of the charge state after the fault is cleared is not lower than a lowest threshold value.

11. The method of claim 2, wherein the step of controlling the power storage device to be in a charged state comprises:

Controlling a power angle between a three-phase voltage of the power grid and a three-phase voltage of the power type energy storage device to be greater than zero and to change with a charge state of the power type energy storage device;

wherein the higher the state value of the charge state, the smaller the power angle.

12. The control method according to claim 1, characterized in that the control method further comprises:

and controlling the reactive power output by the power type energy storage device by controlling the potential of the power type energy storage device according to the reactive power consumption upper limit value of the target load in response to the power grid not being failed.

13. The control method of claim 1, wherein the electrical grid comprises a micro-grid.

14. A control device of a power type energy storage device, wherein the power type energy storage device is connected to an inlet wire end of a second transformer via a first transformer, a power grid is connected to the inlet wire end, and an outlet wire end of the second transformer is connected to a target load, wherein the control device comprises:

a hot standby control unit configured to control the power type energy storage device to be in a hot standby state in response to the grid not being failed;

A fault response control unit configured to control the power type energy storage device to provide a short circuit current for a fault point of the power grid in response to occurrence of a short circuit fault of the power grid so as to avoid disconnection of a breaker of the power grid;

15. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, causes the processor to perform the control method of the power storage device according to any one of claims 1 to 13.

16. A control device for a power type energy storage device, the control device comprising:

a processor;

a memory storing a computer program which, when executed by a processor, causes the processor to perform the method of controlling a power storage device as claimed in any one of claims 1 to 13.