CN107069722B - Shore power system electric signal setting device, method and system with reverse power protection - Google Patents
Shore power system electric signal setting device, method and system with reverse power protection Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
Abstract
The disclosure relates to a shore power system electrical signal setting device, method and system with reverse power protection, wherein the shore power system electrical signal setting device comprises a sampling module for sampling power supply voltage and/or power supply frequency of a ship electrical system; the PID tracking module is used for tracking the power supply voltage and/or the power supply frequency of the ship electric system by adopting a PID algorithm to generate tracking voltage and/or tracking frequency, so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship electric system; and the shore power system electric signal setting module is used for setting the power supply voltage and/or the power supply frequency of the shore power system as tracking voltage and/or tracking frequency. According to the shore power system electric signal setting device, method and system, reverse power flowing to a shore power system can be avoided, so that damage to the shore power system caused by the reverse power is fundamentally and effectively prevented.
Description
Technical Field
The invention relates to the field of power electronics, in particular to an electric signal setting device, method and system for a shore power system with reverse power protection.
Background
In the past, the ship berthing at the port needs to adopt the auxiliary engine of the ship to generate electricity 24 hours a day so as to meet the electricity demand of the ship. However, the marine auxiliary machinery burns a large amount of fuel during operation, discharges a large amount of exhaust gas, and continuously generates noise pollution for 24 hours, which is disadvantageous for energy saving and environmental protection. To solve this problem, shore power systems have been developed by which power can be supplied to vessels berthing at ports.
The use of shore power systems to power ships at ports and docks requires the shore power systems and the ship power systems to be synchronized. During contemporaneous grid connection, reverse power to the shore power system or the ship power system is most likely to be generated, for example: when the voltage of the shore power system is greater than that of the ship power system, reverse power flowing to the ship power system is generated, and when the voltage of the ship power system is greater than that of the shore power system, reverse power flowing to the shore power system is generated. The reverse power can influence the normal operation of the marine diesel generator set, shorten the service life of the marine diesel generator set, and also can cause the main equipment of a shore power system, namely a high-voltage variable frequency and voltage device, to generate heat, thereby causing the thermal breakdown of IGPT (Insulated Gate Bipolar Transistor ) serving as a key component of the marine diesel generator set.
In the aspect of coping with the reverse power, the prior art has more protection measures for the ship electric system and very few protection measures for the shore electric system.
Disclosure of Invention
In view of this, the technical problem to be solved by the present disclosure is how to perform reverse power protection on a shore power system.
According to an aspect of the present disclosure, there is provided a shore power system electric signal setting apparatus with reverse power protection, the shore power system electric signal setting apparatus including: the sampling module is connected with the ship electrical system and is used for sampling to obtain the power supply voltage and/or the power supply frequency of the ship electrical system; the PID tracking module is connected with the sampling module and used for receiving the power supply voltage and/or the power supply frequency of the ship electric system from the sampling module, and tracking the power supply voltage and/or the power supply frequency of the ship electric system by adopting a PID algorithm to generate tracking voltage and/or tracking frequency so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship electric system; and the shore power system electric signal setting module is connected with the PID tracking module and the shore power system, and is used for receiving the tracking voltage and/or the tracking frequency from the PID tracking module and setting the power supply voltage and/or the power supply frequency of the shore power system as the tracking voltage and/or the tracking frequency.
For the shore power system electric signal setting device, in one possible implementation manner, the shore power system electric signal setting device further includes: the synchronous device control module is connected with the sampling module, the PID tracking module and the synchronous device, the synchronous device is used for synchronously connecting the shore power system and the ship power system, the synchronous device control module is used for receiving the power supply voltage and/or the power supply frequency of the ship power system from the sampling module, receiving the tracking voltage and/or the tracking frequency from the PID tracking module, and sending a locking signal to the synchronous device when the tracking voltage and/or the tracking frequency is monitored to be smaller than the power supply voltage and/or the power supply frequency of the ship power system so that the synchronous device is in a locking state.
For the shore power system electrical signal setting device, in one possible implementation manner, the synchronous device control module is further configured to send an unlocking signal to the synchronous device when the tracking voltage and/or the tracking frequency are/is not less than the power supply voltage and/or the power supply frequency of the marine power system, so that the synchronous device releases the locking state.
For the shore power system electric signal setting device, in one possible implementation manner, the PID tracking module is configured to track a supply voltage and/or a supply frequency of the marine power system by using a discrete PID algorithm to generate the tracking voltage and/or the tracking frequency.
For the shore power system electric signal setting device, in one possible implementation manner, the PID tracking module is configured to track a supply voltage and/or a supply frequency of the marine power system by using the following discrete PID algorithm to generate the tracking voltage and/or the tracking frequency: AH (AH) (k+1) ＝(e (k+1) -e (k) )×K P +e (k+1) ×K i +(e (k+1) -2e (k) +e (k-1) )×K d +AH (k) +XH, where AH (k+1) Tracking voltage and/or frequency for the (k+1) th generation; e, e (k+1) ＝CH (k+1) -AH (k) Wherein CH is (k+1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k+1th time (k) Tracking voltage and/or tracking frequency generated for the kth time; e, e (k) ＝CH (k) -AH (k-1) Wherein CH is (k) AH for the kth supply voltage and/or supply frequency of the marine electrical system received from the sampling module (k-1) Tracking voltage and/or tracking frequency generated for the k-1 th time; e, e (k-1) ＝CH (k-1) -AH (k-2) Wherein CH is (k-1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k-1 th time (k-2) Tracking voltage and/or tracking frequency generated for the k-2 th time; k (K) P Is a proportionality coefficient, K i As integral coefficient, K d As differential coefficient, AH (k) XH is a non-negative value for the kth generated tracking voltage and/or tracking frequency.
According to another aspect of the present disclosure, there is provided a shore power system, the shore power system including: the voltage transformation frequency conversion device is connected with a power grid, is used for receiving an electric signal from the power grid, transforming and/or converting the electric signal, is connected with the ship electrical system through a breaker, and is used for supplying the electric signal transformed and/or converted by the voltage transformation frequency conversion device to a ship under the condition that the synchronous device controls the breaker to be in a closing state; and the shore power system electric signal setting device according to any one of claims 1-5, which is respectively connected with the voltage transformation frequency conversion device, the ship power system and the synchronization device and is used for tracking the power supply voltage and/or the power supply frequency of the ship power system to generate the tracking voltage and/or the tracking frequency so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship power system, and setting the output voltage and/or the output frequency of the voltage transformation frequency conversion device as the tracking voltage and/or the tracking frequency.
According to another aspect of the present disclosure, there is provided a shore power system electric signal setting method including: sampling to obtain power supply voltage and/or power supply frequency of a ship electric system; tracking the power supply voltage and/or the power supply frequency of the ship electrical system by adopting a PID algorithm to generate tracking voltage and/or tracking frequency, so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship electrical system; setting the supply voltage and/or the supply frequency of the shore power system as the tracking voltage and/or the tracking frequency.
For the shore power system electrical signal setting method, in one possible implementation manner, the tracking the power supply voltage and/or the power supply frequency of the ship power system by adopting the PID algorithm to generate the tracking voltage and/or the tracking frequency includes: tracking a supply voltage and/or a supply frequency of the marine electrical system using a discrete PID algorithm to generate the tracking voltage and/or tracking frequency.
For the shore power system electric signal setting method, in one possible implementation manner, the discrete PID algorithm is adopted to track the shore power system electric signalThe supply voltage and/or supply frequency of the marine electrical system to generate the tracking voltage and/or tracking frequency comprises: the following discrete PID algorithm is sampled to track the supply voltage and/or supply frequency of the marine electrical system to generate the tracking voltage and/or tracking frequency: AH (AH) (k+1) ＝(e (k+1) -e (k) )×K P +e (k+1) ×K i +(e (k+1) -2e (k) +e (k-1) )×K d +AH (k) +XH, where AH (k+1) Tracking voltage and/or frequency for the (k+1) th generation; e, e (k+1) ＝CH (k+1) -AH (k) Wherein CH is (k+1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k+1th time (k) Tracking voltage and/or tracking frequency generated for the kth time; e, e (k) ＝CH (k) -AH (k-1) Wherein CH is (k) AH for the kth supply voltage and/or supply frequency of the marine electrical system received from the sampling module (k-1) Tracking voltage and/or tracking frequency generated for k-1; e, e (k-1) ＝CH (k-1) -AH (k-2) Wherein CH is (k-1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k-1 th time (k-2) Tracking voltage and/or tracking frequency generated for the k-2 th time; k (K) P Is a proportionality coefficient, K i As integral coefficient, K d As differential coefficient, AH (k) XH is a non-negative value for the kth generated tracking voltage and/or tracking frequency.
For the shore power system electrical signal setting method, in one possible implementation manner, the shore power system electrical signal setting method further includes: when the tracking voltage and/or the tracking frequency are/is monitored to be smaller than the power supply voltage and/or the power supply frequency of the ship electric system, a locking signal is sent to the synchronous device, so that the synchronous device is in a locking state; and when the tracking voltage and/or the tracking frequency are/is not less than the power supply voltage and/or the power supply frequency of the ship electric system, sending an unlocking signal to the synchronous device so that the synchronous device releases the locking state.
The power supply voltage and/or the power supply frequency of the shore power system are tracked through the PID algorithm, so that the power supply voltage and/or the power supply frequency of the shore power system are greater than or equal to the power supply voltage and/or the power supply frequency of the shore power system, reverse power flowing to the shore power system is avoided, and damage to the shore power system caused by the reverse power is effectively prevented fundamentally.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 shows a block diagram of a shore power system electrical signal setup apparatus, according to one embodiment of the present disclosure;
FIG. 2 shows a block diagram of a voltage setting device of a shore power system according to an embodiment of the present disclosure;
FIG. 3 illustrates an application scenario schematic of a shore power system according to an embodiment of the present disclosure;
fig. 4 shows a flowchart of a shore power system electrical signal setup method according to an embodiment of the present disclosure.
List of reference numerals
100. Electric signal setting device for shore power system
200. Shore power system
300. Ship electric system
110. Sampling module
120. PID tracking module
130. Shore power system electric signal setting module
140. Synchronous device control module
400. Synchronous device
210. Variable-voltage variable-frequency device
500. Circuit breaker
Detailed Description
Various exemplary embodiments, features and aspects of the disclosure will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following detailed description in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements, and circuits well known to those skilled in the art have not been described in detail in order not to obscure the present disclosure.
Example 1
Before explaining the shore power system electric signal setting device of an embodiment of the present disclosure, the reason and hazard of the reverse power generation will be explained first.
When the ship is on shore, the ship needs to be connected with a shore power system so that the shore power system can supply power to electric equipment on the ship; when the ship is offshore, power supply to the electric equipment on the ship by the ship electrical system needs to be restored. In the process, the shore power system and the ship power system are synchronously connected.
When the synchronous device detects that the shore power system and the ship electric system meet synchronous conditions, the shore power system and the ship electric system can be synchronously connected. The contemporaneous condition allows the frequency, voltage and phase angle of the two systems to be certain different, i.e. the contemporaneous condition is considered to be satisfied when the difference of the frequency, voltage and phase angle of the two systems is within the range of the respective threshold.
At the moment of synchronous grid connection, reverse power flowing to a shore power system or a ship power system is most likely to be generated.
The reverse power can be divided into two types: the active reverse power and the reactive reverse power are respectively caused by the frequency difference or the voltage difference of two systems in grid-connected operation at the moment of grid connection. Specifically, if the frequency of the ship electric system is greater than the frequency of the shore electric system at the moment of grid connection, the active reverse power flowing to the shore electric system may occur, and if the frequency of the ship electric system is less than the frequency of the shore electric system at the moment of grid connection, the active reverse power flowing to the ship electric system may occur; reactive reverse power to the shore power system may occur if the voltage of the shore power system is greater than the voltage of the shore power system at the moment of grid connection, and reactive reverse power to the shore power system may occur if the voltage of the shore power system is less than the voltage of the shore power system at the moment of grid connection.
If the active reverse power flowing to the ship electric system occurs, the oscillating impact current is generated, so that the diesel generator generates vibration; if reactive reverse power to the ship electrical system occurs, the stator windings of the diesel generator may be caused to heat up or the stator winding ends may be damaged under the action of the electromotive force. The above conditions affect the normal operation of the diesel generator and shorten its service life. For this situation, the diesel generators currently located on the ship side are generally equipped with automatic regulation devices that eliminate the active or reactive reverse power by changing their throttle or excitation, in order to reduce the damage to the ship electrical system caused by the active or reactive reverse power.
If active reverse power or reactive reverse power flowing to the shore power system occurs, the main equipment of the shore power system is a high-voltage variable-frequency and variable-voltage device, so that the high-voltage variable-frequency and variable-voltage device can generate heat under the condition of generating the active reverse power and the reactive reverse power, and the thermal breakdown of an IGBT (insulated gate bipolar transistor) which is a key component of the high-voltage variable-frequency and variable-voltage device is caused. How to protect the shore power system from the damage of active and reactive reverse power is a problem which needs to be solved at present. Therefore, an embodiment of the disclosure provides an electrical signal setting device for a shore power system, which enables a power supply voltage and/or a power supply frequency of the shore power system to be greater than or equal to a power supply voltage and/or a power supply frequency of a ship electrical system through a PID tracking algorithm, so as to fundamentally and effectively prevent damage to the shore power system caused by reverse power.
Fig. 1 shows a block diagram of a shore power system electric signal setting apparatus 100 according to an embodiment of the present disclosure. As shown in fig. 1, the shore power system electric signal setting apparatus 100 mainly includes: a sampling module 110, a PID (proportional-integral-derivative) tracking module 120, and a shore power system electrical signal setting module 130.
The sampling module 110 is connected with the avionics system 300 and is used for sampling to obtain the power supply voltage and/or the power supply frequency of the avionics system 300; the PID tracking module 120 is connected with the sampling module 110 and is used for receiving the power supply voltage and/or the power supply frequency of the ship electric system 300 from the sampling module 110, and tracking the power supply voltage and/or the power supply frequency of the ship electric system 300 by adopting a PID algorithm to generate tracking voltage and/or tracking frequency so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship electric system 300; and the shore power system electric signal setting module 130 is connected with the PID tracking module 120 and the shore power system 200, and is used for receiving the tracking voltage and/or tracking frequency from the PID tracking module 120 and setting the power supply voltage and/or power supply frequency of the shore power system 200 as the tracking voltage and/or tracking frequency.
According to the embodiment of the disclosure, the power supply voltage and/or the power supply frequency of the shore power system are tracked through the PID algorithm, so that the power supply voltage and/or the power supply frequency of the shore power system are greater than or equal to the power supply voltage and/or the power supply frequency of the shore power system, reverse power flowing to the shore power system is avoided, and damage to the shore power system caused by the reverse power is fundamentally and effectively prevented.
The inventor has found through intensive research that the scale of the ship electric system is smaller, the fluctuation of the power supply voltage and the power supply frequency is larger, if a difference tracking method is adopted, the synchronous condition can not be satisfied in a longer period of time, and synchronous grid connection can not be carried out. In contrast, in an embodiment of the present disclosure, tracking is performed by using a PID algorithm tracking module, and the tracking voltage and/or tracking frequency can quickly track the supply voltage and/or supply frequency of the ship electrical system, which is beneficial to quickly implementing synchronization grid connection.
The shore power system electric signal setting means 100 may be activated when it is detected that a dockside vessel needs the shore power system 200 to supply power to the electrical consumer thereon. The sampling module 110 samples the output voltage and/or the output frequency of the power supply device of the avionics system 300 to obtain the power supply voltage and/or the power supply frequency of the avionics system 300, for example, the sampling module 110 may sample the output voltage and/or the output frequency of the power supply device of the avionics system 300 32 times in a cycle to obtain 32 power supply voltages and/or 32 power supply frequencies, where the cycle is a process of completing a complete change of the ac power and returning to an initial value. It should be noted that the sampling frequency in one cycle is not fixed, and can be regulated and controlled by a user according to actual needs.
In one possible implementation, the PID tracking module 120 is configured to track the supply voltage and/or supply frequency of the avionics system 300 using a discrete PID algorithm to generate the tracking voltage and/or tracking frequency.
In one example, the PID tracking module 120 is configured to track the supply voltage and/or supply frequency of the marine electrical system 300 to generate the tracking voltage and/or tracking frequency using the following discrete PID algorithm: AH (AH) (k+1) ＝(e (k+1) -e (k) )×K P +e (k+1) ×K i +(e (k+1) -2e (k) +e (k-1) )×K d +AH (k) +XH, where AH (k+1) Tracking voltage and/or frequency for the (k+1) th generation; e, e (k+1) ＝CH (k+1) -AH (k) Wherein CH is (k+1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k+1th time (k) Tracking voltage and/or tracking frequency generated for the kth time; e, e (k) ＝CH (k) -AH (k-1) Wherein CH is (k) AH for the kth supply voltage and/or supply frequency of the marine electrical system received from the sampling module (k-1) Tracking voltage and/or tracking frequency generated for the k-1 th time; e, e (k-1) ＝CH (k-1) -AH (k-2) Wherein CH is (k-1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k-1 th time (k-2) Tracking voltage and/or tracking frequency generated for the k-2 th time; k (K) P Is a proportionality coefficient, K i As an integral coefficient of the power supply,K d as differential coefficient, AH (k) XH is a non-negative value for the kth generated tracking voltage and/or tracking frequency. It will be appreciated by those skilled in the art that if counting from the 0 th time is provided, k is a positive integer of 2 or more.
Typically the output of the PID algorithm (e.g. AH in the above equation (k) ) Around the input (e.g. CH in the above formula (k) ) And fluctuates up and down. In this example, the inventors have made AH by adding a "+XH" portion at the right end of the equation (k) Around (CH) (k) +XH) up and down. When XH is greater than 0, it is advantageous to reduce AH (k) Less than CH (k) Thereby further preventing the generation of reverse power to the shore power system.
The number of XH can be determined as desired by one skilled in the art. In some scenarios, the contemporaneous condition allows a frequency difference of (+ -0.2%. Times.A) — 0.5%. Times.A where A represents the target frequency. For example, a may be a reference power supply frequency of the avionics system, which is currently common at 50Hz or 60Hz. In particular, since the avionics system 300 is small in scale, it is considered that the allowable frequency difference is (+ -0.5%. Times.A), and XH is preferable (+0.5%. Times.A). Taking the reference supply frequency of 60Hz as an example, XH is preferably 0.3.
The calculation period and the output period of the PID tracking module may be determined according to practical situations, for example, may be 0.1 seconds, which is not limited in the present disclosure.
Inventor pair K P 、K i 、K d The effect of the value on the performance of the PID tracking module is studied and analyzed.
(1) Scaling factor K P Influence on tracking Performance
K P The sensitivity of the PID tracking module can be improved, the tracking speed is increased, and the steady-state error of the PID tracking module is reduced. But K is P When the oscillation frequency is larger, the oscillation frequency is increased, and the adjustment time is prolonged. K (K) P Excessive, it may cause instability of the PID tracking module. K (K) P Too small, the sensitivity of the PID tracking system decreases, possibly resulting in slow tracking speed. After a large number of tests, the setting of K can be considered P 0.1.
(2) Integral coefficient K i Influence on tracking Performance
K i The stability of the PID tracking module is reduced due to the small size, but steady-state errors can be reduced, so that the control precision of the PID tracking module is improved. After a large number of tests, the setting of K can be considered i 0.4.
(3) Differential coefficient K d Influence on tracking Performance
K d For adjusting the dynamics of the PID tracking module. K (K) d When the deviation is large, the overshoot is large, and the adjustment time is short; k (K) d When the adjustment is smaller, the overshoot is larger, but the adjustment time is longer. Only K d The overshoot and the adjustment time are smaller only when the value of the (E) is moderate. After a large number of tests, the setting of K can be considered d 0.2 or 0.3.
Two examples of tracking the power frequency of a avionics system in accordance with an embodiment of the present disclosure are shown below.
In example 1: k (K) P The value is 0.1, K i The value is 0.4, K d Take on a value of 0.2 and XH takes on a value of 0.
Example 1
In example 2: k (K) P The value is 0.1, K i The value is 0.4, K d The value of XH is 0.3.
Example 2
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As can be seen from the above examples, an embodiment of the present disclosure is applied such that the tracking frequency AH (k) The power supply frequency of the ship electrical system can be well tracked. In particular, in the above example, the fluctuation range of the power supply frequency of the ship electric system is far larger than the actual fluctuation range of the power supply frequency of the general ship electric system, and even in this case, the tracking frequency AH obtained according to an embodiment of the present disclosure (k) The tracking purpose can still be well achieved.
According to the test, the power supply voltage of the ship electric system can be tracked rapidly and tightly by applying the embodiment of the present disclosure, and the disclosure will not be repeated.
In one possible implementation, as shown in fig. 2, the shore power system electric signal setting apparatus 100 according to the above embodiment of the present disclosure may further include: and the synchronization device control module 140 is connected with the sampling module 110, the PID tracking module 120 and the synchronization device 400, wherein the synchronization device 400 is used for synchronization grid connection of the shore power system 200 and the marine power system 300, the synchronization device control module 140 is used for receiving the power supply voltage and/or the power supply frequency of the marine power system 300 from the sampling module 110 and receiving the tracking voltage and/or the tracking frequency from the PID tracking module 120, and when the tracking voltage and/or the tracking frequency is detected to be smaller than the power supply voltage and/or the power supply frequency of the marine power system 300, a locking signal is sent to the synchronization device 400 so that the synchronization device 400 is in a locking state.
As is well known to those skilled in the art, when the synchronization device is in the unlocked state, the synchronization device may close to perform synchronization grid connection if the synchronization device detects that the shore power system 200 and the marine power system 300 meet synchronization conditions. If the supply voltage and/or supply frequency of the marine power system is slightly greater than the supply voltage and/or supply frequency of the shore power system and the difference is within the threshold allowed by the contemporaneous condition, then the contemporaneous condition is considered satisfied, however, at this time, contemporaneous grid connection is performed, and reverse power to shore power system 200 is still generated. Therefore, in the above implementation manner, when the synchronous device control module 140 detects that the tracking voltage and/or the tracking frequency is smaller than the supply voltage and/or the supply frequency of the ship electric system, the synchronous device is directly locked, so that the synchronous grid connection is not performed even if the synchronous condition is met, and further, the generation of reverse power flowing to the shore electric system is avoided.
The synchronous device control module 140 is further configured to send an unlocking signal to the synchronous device 400 when the tracking voltage and/or tracking frequency is not less than the power supply voltage and/or power supply frequency of the ship electric system 300, so that the synchronous device 400 releases the locked state.
It should be noted that, those skilled in the art should understand how to implement each component included in the relay protection device according to any one of the foregoing embodiments of the present disclosure through hardware (such as discrete hardware elements, an integrated circuit, a digital circuit based on a gate device, an analog circuit element, a programmable hardware device (such as a singlechip, an FPGA, etc.), and circuitry formed by any combination of the foregoing, etc.), which will not be repeated herein.
Example 2
Fig. 3 shows an application scenario schematic of a shore power system according to an embodiment of the present disclosure. The components in fig. 3, which are numbered identically to those of fig. 1 and 2, have the same functions, and detailed descriptions of these components are omitted for the sake of brevity.
As shown in fig. 3, the shore power system 200 includes: and a variable-voltage and variable-frequency device 210 connected to a power grid for receiving an electric signal (the power grid side voltage may be 10 KV) from the power grid and transforming and/or frequency-converting the electric signal, wherein the variable-voltage and variable-frequency device 210 is connected to the avionics system 300 (the ship side voltage may be 6.6 KV) via a circuit breaker 500, and the variable-voltage and variable-frequency device 210 supplies the transformed and/or frequency-converted electric signal to the ship when the synchronous device 400 controls the circuit breaker 500 to be in a closed state.
And the shore power system electric signal setting device 100 shown in fig. 1 and 2 is respectively connected with the variable-voltage variable-frequency device 210, the ship power system 300 and the synchronization device 400, and is used for tracking the power supply voltage and/or the power supply frequency of the ship power system 300 to generate the tracking voltage and/or the tracking frequency, so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship power system 300, and setting the output voltage and/or the output frequency of the variable-voltage variable-frequency device 210 as the tracking voltage and/or the tracking frequency.
Similarly, in the shore power system 200 according to an embodiment of the present disclosure, the output voltage and/or the output frequency of the variable-voltage variable-frequency device 210 are greater than or equal to the supply voltage and/or the supply frequency of the ship power system 300, so that damage to the shore power system 200 caused by generation of reverse power is prevented.
Example 3
Fig. 4 shows a flowchart of a shore power system electrical signal setup method according to an embodiment of the present disclosure. As shown in fig. 4, the shore power system electric signal setting method includes:
step 401, sampling to obtain a power supply voltage and/or a power supply frequency of the ship electric system.
And step 402, tracking the power supply voltage and/or the power supply frequency of the ship electric system by adopting a PID algorithm to generate tracking voltage and/or tracking frequency, so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship electric system.
In one possible implementation, step 402 may include: tracking a supply voltage and/or a supply frequency of the marine electrical system using a discrete PID algorithm to generate the tracking voltage and/or tracking frequency.
In one example, tracking the supply voltage and/or supply frequency of the marine electrical system using a discrete PID algorithm to generate the tracking voltage and/or tracking frequency includes: the following discrete PID algorithm is sampled to track the supply voltage and/or supply frequency of the marine electrical system to generate the tracking voltage and/or tracking frequency: AH (AH) (k+1) ＝(e (k+1) -e (k) )×K P +e (k+1) ×K i +(e (k+1) -2e (k) +e (k-1) )×K d +AH (k) +XH, where AH (k+1) Tracking voltage and/or frequency for the (k+1) th generation; e, e (k+1) ＝CH (k+1) -AH (k) Wherein CH is (k+1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k+1th time (k) Tracking voltage and/or tracking frequency generated for the kth time; e, e (k) ＝CH (k) -AH (k-1) Wherein CH is (k) AH for the kth supply voltage and/or supply frequency of the marine electrical system received from the sampling module (k-1) Tracking voltage and/or tracking frequency generated for k-1; e, e (k-1) ＝CH (k-1) -AH (k-2) Wherein CH is (k-1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k-1 th time (k-2) Tracking voltage and/or tracking frequency generated for the k-2 th time; k (K) P Is a proportionality coefficient, K i As integral coefficient, K d As differential coefficient, AH (k) XH is a non-negative value for the kth generated tracking voltage and/or tracking frequency.
Step 403, setting the supply voltage and/or the supply frequency of the shore power system to the tracking voltage and/or the tracking frequency.
In one possible implementation, when the tracking voltage and/or tracking frequency is monitored to be less than the supply voltage and/or supply frequency of the marine electrical system, a lockout signal is sent to the contemporaneous device to cause the contemporaneous device to be in a lockout state.
In one possible implementation, when the tracking voltage and/or tracking frequency is not less than the supply voltage and/or supply frequency of the ship electrical system, an unlocking signal is sent to the contemporaneous device to cause the contemporaneous device to release the locked state.
According to the embodiment of the disclosure, the power supply voltage and/or the power supply frequency of the shore power system are tracked through the PID algorithm, so that the power supply voltage and/or the power supply frequency of the shore power system are greater than or equal to the power supply voltage and/or the power supply frequency of the shore power system, reverse power flowing to the shore power system is avoided, and damage to the shore power system caused by the reverse power is fundamentally and effectively prevented.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement of the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A shore power system electrical signal setting device with reverse power protection, characterized in that the shore power system electrical signal setting device comprises:
the sampling module is connected with the ship electrical system and is used for sampling to obtain the power supply voltage and/or the power supply frequency of the ship electrical system;
the PID tracking module is connected with the sampling module and used for receiving the power supply voltage and/or the power supply frequency of the ship electric system from the sampling module, and tracking the power supply voltage and/or the power supply frequency of the ship electric system by adopting a PID algorithm to generate tracking voltage and/or tracking frequency so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship electric system;
and the shore power system electric signal setting module is connected with the PID tracking module and the shore power system, and is used for receiving the tracking voltage and/or the tracking frequency from the PID tracking module and setting the power supply voltage and/or the power supply frequency of the shore power system as the tracking voltage and/or the tracking frequency.
2. The shore power system electric signal setting device according to claim 1, further comprising:
the synchronous device control module is connected with the sampling module, the PID tracking module and the synchronous device, the synchronous device is used for synchronously connecting the shore power system and the ship power system, the synchronous device control module is used for receiving the power supply voltage and/or the power supply frequency of the ship power system from the sampling module, receiving the tracking voltage and/or the tracking frequency from the PID tracking module, and sending a locking signal to the synchronous device when the tracking voltage and/or the tracking frequency is monitored to be smaller than the power supply voltage and/or the power supply frequency of the ship power system so that the synchronous device is in a locking state.
3. The shore power system electric signal setting device according to claim 2, wherein the synchronization device control module is further configured to send an unlocking signal to the synchronization device to cause the synchronization device to release the locked state when the tracking voltage and/or the tracking frequency are/is monitored to be not less than a power supply voltage and/or a power supply frequency of the marine power system.
4. The shore power system electric signal setting device according to claim 1, wherein said PID tracking module is configured to track a supply voltage and/or a supply frequency of said marine electric system using a discrete PID algorithm to generate said tracking voltage and/or tracking frequency.
5. The shore power system electrical signal setting device according to claim 4, wherein said PID tracking module is configured to track a supply voltage and/or a supply frequency of said marine electrical system to generate said tracking voltage and/or tracking frequency using the following discrete PID algorithm:
AH (k+1) ＝(e (k+1) -e (k) )×K P +e (k+1) ×K i +(e (k+1) -2e (k) +e (k-1) )×K d +AH (k) +XH，
wherein AH is (k+1) Tracking voltage and/or frequency for the (k+1) th generation;
e (k+1) ＝CH (k+1) -AH (k) wherein CH is (k+1) For the (k+1) -th slaveThe sampling module receives the power supply voltage and/or power supply frequency of the ship electric system, AH (k) Tracking voltage and/or tracking frequency generated for the kth time;
e (k) ＝CH (k) -AH (k-1) wherein CH is (k) AH for the kth supply voltage and/or supply frequency of the marine electrical system received from the sampling module (k-1) Tracking voltage and/or tracking frequency generated for k-1;
e (k-1) ＝CH (k-1) -AH (k-2) wherein CH is (k-1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k-1 th time (k-2) Tracking voltage and/or tracking frequency generated for the k-2 th time;
K P is a proportionality coefficient, K i As integral coefficient, K d As differential coefficient, AH (k) XH is a non-negative value for the kth generated tracking voltage and/or tracking frequency.
6. A shore power system, said shore power system comprising:
the voltage transformation frequency conversion device is connected with a power grid, is used for receiving an electric signal from the power grid, transforming and/or converting the electric signal, is connected with the ship electrical system through a breaker, and is used for supplying the electric signal transformed and/or converted by the voltage transformation frequency conversion device to a ship under the condition that the synchronous device controls the breaker to be in a closing state; and
the shore power system electric signal setting device according to any one of claims 1-5, being respectively connected with the voltage transformation frequency conversion device, the ship power system and the synchronization device, and being used for tracking the power supply voltage and/or the power supply frequency of the ship power system to generate the tracking voltage and/or the tracking frequency, so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship power system, and setting the output voltage and/or the output frequency of the voltage transformation frequency conversion device as the tracking voltage and/or the tracking frequency.
7. The shore power system electric signal setting method is characterized by comprising the following steps of:
sampling to obtain power supply voltage and/or power supply frequency of a ship electric system;
tracking the power supply voltage and/or the power supply frequency of the ship electrical system by adopting a PID algorithm to generate tracking voltage and/or tracking frequency, so that the tracking voltage and/or the tracking frequency is greater than or equal to the power supply voltage and/or the power supply frequency of the ship electrical system;
setting the supply voltage and/or the supply frequency of the shore power system as the tracking voltage and/or the tracking frequency.
8. The shore power system electric signal setting method according to claim 7, wherein said tracking a supply voltage and/or a supply frequency of said marine electric system using a PID algorithm to generate a tracking voltage and/or a tracking frequency comprises:
tracking a supply voltage and/or a supply frequency of the marine electrical system using a discrete PID algorithm to generate the tracking voltage and/or tracking frequency.
9. The shore power system electric signal setting method of claim 8, wherein said tracking a supply voltage and/or a supply frequency of said marine electric system using a discrete PID algorithm to generate said tracking voltage and/or tracking frequency comprises:
the following discrete PID algorithm is sampled to track the supply voltage and/or supply frequency of the marine electrical system to generate the tracking voltage and/or tracking frequency:
AH (k+1) ＝(e (k+1) -e (k) )×K P +e (k+1) ×K i +(e (k+1) -2e (k) +e (k-1) )×K d +AH (k) +XH，
wherein AH is (k+1) Tracking voltage and/or frequency for the (k+1) th generation;
e (k+1) ＝CH (k+1) -AH (k) wherein CH is (k+1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k+1th time (k) Tracking voltage and/or tracking frequency generated for the kth time;
e (k) ＝CH (k) -AH (k-1) wherein CH is (k) AH for the kth supply voltage and/or supply frequency of the marine electrical system received from the sampling module (k-1) Tracking voltage and/or tracking frequency generated for k-1;
e (k-1) ＝CH (k-1) -AH (k-2) wherein CH is (k-1) AH for the supply voltage and/or supply frequency of the marine electrical system received from the sampling module for the k-1 th time (k-2) Tracking voltage and/or tracking frequency generated for the k-2 th time;
K P is a proportionality coefficient, K i As integral coefficient, K d As differential coefficient, AH (k) XH is a non-negative value for the kth generated tracking voltage and/or tracking frequency.
10. The shore power system electric signal setting method according to claim 7, further comprising:
when the tracking voltage and/or the tracking frequency are/is monitored to be smaller than the power supply voltage and/or the power supply frequency of the ship electric system, a locking signal is sent to the synchronous device, so that the synchronous device is in a locking state;
and when the tracking voltage and/or the tracking frequency are/is not less than the power supply voltage and/or the power supply frequency of the ship electric system, sending an unlocking signal to the synchronous device so that the synchronous device releases the locking state.
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