Compressed air energy storage power station synchronizing system

Abstract

The utility model discloses a synchronizing system of a compressed air energy storage power station. The synchronizing system comprises a first automatic quasi-synchronizing device, a second automatic quasi-synchronizing device, a manual synchronizing device, a synchronizing blocking relay and a monitoring device, the first automatic quasi-synchronizing device, the second automatic quasi-synchronizing device and the manual synchronizing device are connected with a power grid side voltage transformer and connected with a to-be-connected side voltage transformer; a synchronous closing point is arranged between the power grid side and the to-be-connected side; and the first automatic quasi-synchronizing device, the second automatic quasi-synchronizing device and the manual synchronizing device are connected to a synchronizing closing point closing loop through a synchronizing blocking relay normally open contact. According to the utility model, the first automatic quasi-synchronizing device, the second automatic quasi-synchronizing device and the manual synchronizing device are mutually independent, and the normal operation of other equipment is not influenced when any one of the automatic quasi-synchronizing device, the second automatic quasi-synchronizing device and the manual synchronizing device fails; the two automatic quasi-synchronization devices are arranged to realize dual guarantee, so that the probability of adopting a manual quasi-synchronization device is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of compressed air energy storage power station control, and particularly relates to a synchronization system for a compressed air energy storage power station. Background Art

[0002] Automatic quasi-synchronization utilizes the principles of frequency difference inspection, voltage difference inspection, and phase angle difference inspection. Through a time program and a logic circuit, it is synthesized according to a certain control strategy, and can meet the basic requirements of quasi-synchronization paralleling.

[0003] Currently, there are no relevant industry standards for the setting of the synchronization system in compressed air energy storage power stations. The operating conditions of compressed air energy storage power stations are compressed energy storage at night and expansion energy release during the day, which means that there will be grid connection synchronization closing operations every day, and the operations are more frequent than those of other power generation systems such as hydropower and thermal power generation. The existing synchronization systems of compressed air energy storage power stations are configured with reference to the requirements of thermal power plants, and a single automatic quasi-synchronization device is used to complete the synchronization grid connection operation. Once the device fails, the operating personnel have to perform manual operations. How to select the appropriate grid connection timing is also a great test for the experience and mentality of the operating personnel.

[0004] Therefore, it is urgent to propose a new solution to solve the above problems. Summary of the Invention

[0005] The utility model provides a synchronization system for a compressed air energy storage power station, which can solve the problems existing in the current synchronization process of compressed air energy storage power stations.

[0006] The utility model provides a synchronization system for a compressed air energy storage power station, which includes: a first automatic quasi-synchronization device, a second automatic quasi-synchronization device, a manual synchronization device, a synchronization locking relay, and a monitoring device;

[0007] The first automatic quasi-synchronization device, the second automatic quasi-synchronization device, and the manual synchronization device are connected to the voltage transformer on the grid side;

[0008] The first automatic quasi-synchronization device, the second automatic quasi-synchronization device, and the manual synchronization device are connected to the voltage transformer on the side to be paralleled;

[0009] A synchronization closing point is arranged between the grid side and the side to be paralleled;

[0010] The first automatic quasi-synchronization device, the second automatic quasi-synchronization device, and the manual synchronization device are connected to the closing circuit of the synchronization closing point through the normally open contacts of the synchronization locking relay;

[0011] When the synchronization locking relay detects that the phase angle difference, voltage difference, and frequency difference between the grid side and the side to be paralleled meet the requirements of the synchronization closing criterion, the normally open contacts of the synchronization locking relay close;

[0012] The monitoring device is used to receive the fault alarm signals of the first automatic synchronization device and the second automatic synchronization device.

[0013] Further, the synchronization closing point is the grid-connected breaker.

[0014] Further, both the first automatic synchronization device and the second automatic synchronization device include a central processor chip module, an adjustment module, and an alarm module. The central processor chip module is used to send a closing command to the synchronization closing point after judging that the voltage difference, frequency difference, and phase difference between the grid side and the side to be paralleled of the grid-connected breaker meet the set requirements. The adjustment module is used to adjust the voltage difference, frequency difference, and phase difference to meet the set requirements. The alarm module is used to send the fault alarm signal of the device to the monitoring device.

[0015] Further, the central processor chip module is an A / D chip.

[0016] Further, the synchronization blocking relay takes any one phase voltage of phase A, phase B, and phase C on the secondary sides of the voltage transformers on the grid side and the side to be paralleled.

[0017] Further, the first automatic synchronization device, the second automatic synchronization device, the manual synchronization device, and the synchronization blocking relay are connected to the voltage transformers on the side to be paralleled and the grid side through external wiring terminals.

[0018] Compared with the prior art, the first automatic synchronization device, the second automatic synchronization device, and the manual synchronization device of the present utility model are independent of each other, and the normal operation of other devices is not affected by any one of them failing; double protection is achieved by setting two automatic synchronization devices, greatly reducing the probability of using a manual synchronization device; in addition, a synchronization blocking relay is set, which has the functions of checking and blocking the voltage difference, frequency difference, and phase difference. By connecting the normally open contact of the synchronization blocking relay in series in the closing circuit, the mis-sending of the closing command is prevented, and the impact on the generator set and the power grid caused by not operating at the best grid connection moment is avoided to the greatest extent, effectively improving the safety of the generator paralleling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the wiring diagram of the synchronization system circuit of the compressed air energy storage power station of the present utility model;

[0020] Figure 2 It is the structural schematic diagram of the first automatic synchronization device of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To further understand the content, features, and effects of the present utility model, the following embodiments are given and are described in detail in conjunction with the appended Figures 1 - 2 as follows.

[0022] As Figures 1 - 2 shown, this embodiment provides a synchronization system for a compressed air energy storage power station, which includes: a first automatic synchronization device, a second automatic synchronization device, a manual synchronization device, a synchronization locking relay, and a monitoring device;

[0023] The first automatic synchronization device, the second automatic synchronization device, and the manual synchronization device are connected to the grid-side voltage transformer;

[0024] The first automatic synchronization device, the second automatic synchronization device, and the manual synchronization device are connected to the to-be-paralleled side voltage transformer;

[0025] A synchronization closing point is arranged between the grid side and the to-be-paralleled side;

[0026] The first automatic synchronization device, the second automatic synchronization device, and the manual synchronization device are connected to the closing circuit of the synchronization closing point through the normally open contacts of the synchronization locking relay;

[0027] When the synchronization locking relay detects that the phase angle difference, voltage difference, and frequency difference between the grid side and the to-be-paralleled side meet the requirements of the synchronization closing criterion, the normally open contacts of the synchronization locking relay close;

[0028] The monitoring device is used to receive the fault alarm signals of the first automatic synchronization device and the second automatic synchronization device.

[0029] The first automatic synchronization device, the second automatic synchronization device, and the manual synchronization device of the present utility model are independent of each other, and the normal operation of other devices is not affected by any one of them malfunctioning; double protection is achieved by setting two automatic synchronization devices, greatly reducing the probability of using the manual synchronization device; in addition, a synchronization locking relay is set, which has the functions of differential pressure, frequency difference, and phase difference check and locking. By connecting the normally open contacts of the synchronization locking relay in series in the closing circuit, it is possible to prevent misissuing of the closing command, and to avoid the impact on the generator set and the grid caused by not operating at the optimal grid connection moment to the greatest extent, effectively improving the safety of the generator paralleling operation.

[0030] In this embodiment, the synchronization closing point is the grid connection breaker, which is arranged on the line between the to-be-paralleled side and the grid side.

[0031] In this embodiment, as Figure 2As shown, both the first automatic synchronization device and the second automatic synchronization device include a central processor chip module, an adjustment module, and an alarm module. The central processor chip module is used to send a closing command to the synchronization closing point after determining that the voltage difference, frequency difference, and phase difference between the grid side and the side to be paralleled of the grid-connected circuit breaker meet the set requirements. The adjustment module is used to adjust the voltage difference, frequency difference, and phase difference to meet the set requirements. The alarm module is used to send an alarm signal to the monitoring device. The second automatic synchronization device serves as a backup device for the first automatic synchronization device, and both have the same functions.

[0032] In this embodiment, the central processor chip module is an A / D chip, which is a domestically produced and independently controllable chip.

[0033] In this embodiment, as Figure 1 shown, the synchronization blocking relay takes the phase A voltage on the secondary sides of the grid side voltage transformer and the side to be paralleled voltage transformer, but it can also take the phase B or phase C voltage. Among them, a Us module for measuring the phase A voltage on the secondary side of the grid side voltage transformer and a Ug module for measuring the phase A voltage on the secondary side of the side to be paralleled voltage transformer are provided inside the synchronization blocking relay.

[0034] In this embodiment, as Figure 1 shown, the first automatic synchronization device, the second automatic synchronization device, the manual synchronization device, and the synchronization blocking relay are connected to the side to be paralleled voltage transformer and the grid side voltage transformer through external wiring terminals; the first automatic synchronization device, the second automatic synchronization device, and the manual synchronization device are connected to the normally open contacts of the synchronization blocking relay through external wiring terminals.

[0035] In this embodiment, as Figure 1 shown, the side to be paralleled includes a generator and a main transformer connected in sequence, and the main transformer is connected to both the side to be paralleled voltage transformer and the grid-connected circuit breaker.

[0036] The operation sequence of a synchronous system for a compressed air energy storage power station in this embodiment is as follows:

[0037] 1) When the power station performs synchronous closing, by default, the first automatic synchronization device automatically closes the grid-connected circuit breaker after determining that the voltage difference, frequency difference, and phase difference on both sides of the grid-connected circuit breaker meet the requirements.

[0038] 2) After the first automatic synchronization device sends a fault alarm signal, the following two settings can be made according to operating habits and grid connection requirements (this setting is completed during the equipment installation and commissioning stage, and in the actual operation process, it will directly enter the setting 1 mode or the setting 2 mode):

[0039] Setting 1 mode: After the first automatic synchronization device sends a fault alarm signal to the monitoring device of the compressed air energy storage power station, the operator determines and manually switches to the second automatic synchronization device, and the synchronization closing operation in 1) is realized through the second automatic synchronization device;

[0040] Setting 2 mode: After the first automatic synchronization device sends out a fault alarm signal, the fault alarm system sends it to the second automatic synchronization device while sending an alarm to the monitoring device of the compressed air energy storage power station. After receiving the fault alarm signal, the second automatic synchronization device automatically starts to realize the synchronization closing operation in step 1);

[0041] 3) When both the first automatic synchronization device and the second automatic synchronization device send out fault alarm signals, the operator manually performs a synchronization closing operation through the manual synchronization device.

[0042] By making two settings according to operation habits and grid connection requirements, more selection space is given to the operator.

[0043] What is described above in the present utility model only represents the implementation manners of the embodiments of the present utility model, and thus cannot be understood as a limitation on the scope of the utility model patent, nor is it a limitation on the structure of the embodiments of the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the embodiments of the present utility model, several changes and improvements can still be made, and these all belong to the protection scope of the embodiments of the present utility model.

Claims

1. A compressed air energy storage power station synchronization system, characterized in that: include: A first automatic quasi-synchronizing device, a second automatic quasi-synchronizing device, a manual quasi-synchronizing device, a synchronous locking relay and a monitoring device; The first automatic quasi-synchronous device, the second automatic quasi-synchronous device and the manual synchronization device are connected to the voltage transformer on the grid side; The first automatic quasi-synchronization device, the second automatic quasi-synchronization device and the manual synchronization device are connected to the voltage transformer on the side to be connected; A synchronous closing point is provided between the grid side and the side to be connected; The first automatic quasi-synchronous device, the second automatic quasi-synchronous device and the manual quasi-synchronous device are connected to the closing circuit of the synchronous closing point through the normally open contact of the synchronous locking relay; When the synchronous locking relay detects that the phase angle difference, voltage difference and frequency difference between the grid side and the side to be connected meet the synchronous closing criterion requirements, the normally open contact of the synchronous locking relay is closed; The monitoring device is used to receive fault alarm signals from the first automatic quasi-synchronization device and the second automatic quasi-synchronization device.

2. A compressed air energy storage power station synchronization system according to claim 1, characterized in that: The synchronous closing point is the grid-connected circuit breaker.

3. A compressed air energy storage power station synchronization system according to claim 2, characterized in that: The first automatic quasi-synchronous device and the second automatic quasi-synchronous device both include a central processing unit chip module, an adjustment module and an alarm module. The central processing unit chip module is used to determine that the voltage difference, frequency difference and phase difference between the grid side and the side to be connected of the grid-connected circuit breaker meet the set requirements, and then issue a closing instruction to the synchronous closing point. The adjustment module is used to adjust the voltage difference, frequency difference and phase difference to meet the set requirements. The alarm module is used to send a fault alarm signal of the device to the monitoring device.

4. A compressed air energy storage power station synchronization system according to claim 3, characterized in that: The central processing unit chip module is an A / D chip.

5. A compressed air energy storage power station synchronization system according to claim 1, characterized in that: The synchronous locking relay takes the voltage of any one phase among the A phase, the B phase and the C phase of the secondary side of the voltage transformer on the grid side and the voltage transformer on the side to be connected.

6. A compressed air energy storage power station synchronization system according to claim 1, characterized in that: The first automatic quasi-synchronous device, the second automatic quasi-synchronous device, the manual quasi-synchronous device and the synchronization locking relay are connected to the voltage transformer on the to-be-connected side and the voltage transformer on the grid side through external wiring terminals; the first automatic quasi-synchronous device, the second automatic quasi-synchronous device and the manual synchronization device are connected to the normally open contacts of the synchronization locking relay through external wiring terminals.

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