Heating and dehumidifying control system for wind power converter

Abstract

The utility model provides a heating and dehumidifying control system for a wind power converter, which comprises a first contactor KM1, a second contactor KM2, a third contactor KM3, a first temperature relay KTP1, a second temperature relay KTP2, a humidity relay KH1, a forced starting switch Q1, a first relay KA1, a second relay KA2 and a 220V alternating current power supply, three loops are connected to a 220V alternating current power supply in parallel to supply power to coils of a first contactor KM1, a second contactor KM2 and a third contactor KM3 respectively, and the three contactors are a control cabinet, a power cabinet heater and a UPS contactor respectively. The temperature and humidity relay of the system directly controls the UPS contactor, the UPS contactor cannot be electrified when the temperature and humidity do not meet preset conditions, coils of the heating system contactor and the UPS contactor can be electrified at the same time when the preset conditions are met, a parallel control loop is additionally arranged, and the converter control system automatically takes over control after starting; starting and running of the converter in various low-temperature and high-humidity environments are achieved, the failure rate is reduced, and safe and stable running of the converter is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of wind power generation systems, and in particular relates to a heating and dehumidification control system for a wind power converter. Background Art

[0002] In cold regions, the converter needs to meet the requirements of safe startup at -30℃ or even lower temperatures, and needs to cope with the condition of rapid increase in wind power after startup. At low temperatures, the failure rate of the circuit boards in the control cabinet of the converter is high, and the power modules in the power cabinet are not suitable for high-power operation. The effects of high humidity on electrical components include reduced insulation performance, metal corrosion, and even condensation causing serious faults such as short-circuit discharge. Therefore, it is necessary for the converter to have a heating and dehumidification system in the control cabinet and power cabinet, and the system will be running before and after startup, so the heating and dehumidification control system must meet this requirement.

[0003] Existing heating and dehumidification control systems are mostly aimed at heating conditions before starting. For example, the authorization announcement number is CN204408185U, and the patent name is Low-temperature starting system for wind power converters in severe cold regions. The temperature and humidity conditions of the environment are monitored by temperature and humidity relays, and automatic starting at low temperatures is completed through the linkage control of the heating system contactor and the UPS contactor. There are two main problems with the above patent: First, after power is turned on at low temperature or high humidity, the coils of the heating system contactor and the UPS contactor may be energized at the same time, causing the UPS contactor to first attract and then release, causing an impact on the converter control system or the UPS contactor cannot be released, resulting in direct starting without heating; second, after starting, the converter cannot directly control the heating system.

[0004] In summary, it is necessary to design a wind power converter heating and dehumidification control system to solve the above problems. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a heating and dehumidification control system for a wind power converter, so that the wind power converter automatically starts the heating and dehumidification system in a low temperature and high humidity environment, and starts the machine after the temperature and humidity meet the requirements.

[0006] In the first aspect, an embodiment of the utility model provides a wind power inverter heating and dehumidification control system, including a first contactor KM1, a second contactor KM2, a third contactor KM3, a first temperature relay KTP1, a second temperature relay KTP2, a humidity relay KH1, a forced start switch Q1, a first relay KA1, a second relay KA2 and a 220V AC power supply, wherein three circuits are connected in parallel on the 220V AC power supply to power the coils of the first contactor KM1, the second contactor KM2 and the third contactor KM3, the third contactor KM3 is a UPS power supply contactor, and the main contacts of the first contactor KM1 and the second contactor KM2 are the control cabinet and the power cabinet heater, respectively.

[0007] The coil A1 and the forced start switch Q1 of the third contactor KM3 are connected in series to the 220V AC power supply, and the first temperature relay KTP1 and the humidity relay KH1 are connected in series to the normally open auxiliary contact 13-14 of the third contactor KM3 and then connected in parallel to the forced start switch Q1;

[0008] The coil A1 of the first contactor KM1, the second temperature relay KTP2, and the normally closed auxiliary contacts 61-62 of the third contactor KM3 are connected in series to the 220V AC power supply, and the normally open contacts 1-2 of the first relay KA1 are connected in parallel with the normally closed auxiliary contacts 61-62 of the third contactor KM3;

[0009] The coil A1 of the second contactor KM2 and the normally closed auxiliary contacts 51-52 of the third contactor KM3 are connected in series to the 220V AC power supply, and the normally open contacts 1-2 of the second relay KA2 are connected in parallel to the normally closed auxiliary contacts 51-52 of the third contactor KM3;

[0010] The coils A2 of the first contactor KM1, the second contactor KM2 and the third contactor KM3 are all connected to the neutral line.

[0011] The first temperature relay KTP1 is set to 0°C, the second temperature relay KTP2 is set to 60°C, and the humidity relay KH1 is set to 80%.

[0012] The embodiments of the present invention bring the following beneficial effects:

[0013] The heating and dehumidification control system of the utility model adds a manual start switch, which is convenient for operation and maintenance personnel to start the machine on site in an emergency without waiting for the heating to be completed. A temperature relay is separately set in the heating control system for the control cabinet to avoid overheating.

[0014] The temperature and humidity relay of the heating and dehumidification control system of the utility model directly controls the UPS contactor. If the temperature and humidity do not meet the preset conditions, it will not be energized, thus avoiding false operation. If the temperature and humidity meet the preset conditions, the coils of the heating system contactor and the UPS contactor can be energized at the same time. Since the UPS contactor is self-locking and will not be released, only the heating system contactor can be released. The heating and dehumidification control system adds a parallel control circuit, which automatically switches the heating and dehumidification system to the converter control system control after starting, so as to realize the heating and dehumidification function in the converter operation. There is no need for wind power operation and maintenance personnel to operate the heating and dehumidification system, thus reducing the difficulty of operation and maintenance.

[0015] The UPS contactor of the heating and dehumidification control system of the utility model adds a set of self-locking, and once the machine is started, it will run stably and will not be affected by temperature and humidity. After starting, the forced start switch can also be disconnected to prevent the system from being unable to shut down automatically.

[0016] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures specifically pointed out in the description, claims and drawings.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the circuit connection of a heating and dehumidification control system provided by an embodiment of the utility model;

[0019] Figure 2 A startup logic diagram of a heating and dehumidification control system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] To facilitate understanding of this embodiment, a wind power inverter heating and dehumidification control system disclosed in an embodiment of the utility model is first introduced in detail, including a first contactor KM1, a second contactor KM2, a third contactor KM3, a first temperature relay KTP1, a second temperature relay KTP2, a humidity relay KH1, a forced start switch Q1, a first relay KA1, a second relay KA2 and a 220V AC power supply, wherein three circuits are connected in parallel on the 220V AC power supply to power the coils of the first contactor KM1, the second contactor KM2 and the third contactor KM3, respectively, the third contactor KM3 is a UPS power supply contactor, and the main contacts of the first contactor KM1 and the second contactor KM2 are the control cabinet and the power cabinet heater, respectively.

[0022] There are three parallel control lines from the 220V AC power supply to the coil A1 point of the third contactor KM3: one is the line with the forced start switch Q1; the second is the line with the normally open auxiliary contact of the third contactor KM3; the third is the line with the normally open contact of the first temperature relay KTP1 and the normally closed contact of the humidity relay KH1 in series.

[0023] Specifically, the coil A1 of the third contactor KM3 and the forced start switch Q1 are connected in series to the 220V AC power supply, and the normally open auxiliary contacts 1-2 of the first temperature relay KTP1 and the normally closed contacts 11-12 of the humidity relay KH1 are connected in series and in parallel with the normally open auxiliary contacts 13-14 of the third contactor KM3, and then connected in parallel with the forced start switch Q1; wherein, any of the above circuits closed will cause the coil A1 of the third contactor KM3 to be energized and attracted. When the temperature is greater than the preset temperature of the first temperature relay KTP1, the contact is closed, and when the humidity is greater than the preset humidity of the humidity relay KH1, the contact is open.

[0024] The 220V AC power supply to the coil A1 point of the first contactor KM1 first passes through two parallel control lines: one is the line with the normally closed auxiliary contact of KM3; the other is the line with the normally open contact of the first relay KA1; and then the normally closed contact of the second temperature relay KTP2 is connected in series.

[0025] Specifically, the coil A1 of the first contactor KM1, the normally closed contacts 1-2 of the second temperature relay KTP2, and the normally closed auxiliary contacts 61-62 of the third contactor KM3 are connected in series to a 220V AC power supply, and the normally open contacts 1-2 of the first relay KA1 are connected in parallel with the normally closed auxiliary contacts 61-62 of the third contactor KM3; wherein, when the temperature is greater than the preset temperature of the second temperature relay KTP2, the contacts 1-2 are disconnected.

[0026] There are two parallel control lines from the 220V AC power supply to the coil A1 of the second contactor KM2: one is a line with the normally closed auxiliary contacts of KM3; the other is a line with the normally open contacts of the second relay KA2.

[0027] Specifically, the coil A1 of the second contactor KM2 and the normally closed auxiliary contacts 51-52 of the third contactor KM3 are connected in series to the 220V AC power supply, and the normally open contacts 1-2 of the second relay KA2 are connected in parallel with the normally closed auxiliary contacts 51-52 of the third contactor KM3; wherein, the closure of any of the above circuits will cause the coil A1 of the second contactor KM2 to be energized and attracted.

[0028] The coils A2 of the first contactor KM1, the second contactor KM2 and the third contactor KM3 are all connected to the neutral line.

[0029] Before the system is powered on, the third contactor KM3 is in the released state, then its auxiliary contacts 61-62 and 51-52 are in the closed state, the forced start switch Q1 is in the open state, the first temperature relay KTP1 is set to 0℃, the second temperature relay KTP2 is set to 60℃, and the humidity relay KH1 is set to 80%. The circuit operation analysis under different conditions is as follows:

[0030] The first case: In an environment where the temperature is greater than 0°C and the humidity is less than 80%, the system is powered, the first temperature relay KTP1 and the humidity relay KH1 are connected, and the coil A1 of the third contactor KM3 is energized and attracted. The auxiliary contacts 61-62 and 51-52 of the third contactor KM3 are converted to the disconnected state, and the coils of the first contactor KM1 and the second contactor KM2 are not connected, that is, after starting the machine, the heating and dehumidification system can only be turned on through the inverter control system; the auxiliary contacts 13-14 of the third contactor KM3 are in the on state to achieve self-locking.

[0031] The second case: In an environment where the temperature is less than 0°C and the humidity is greater than 80%, the first temperature relay KTP1 and the humidity relay KH1 circuits are disconnected, and the coil power supply circuits of the first contactor KM1 and the second contactor KM2 are in the on state. The system is powered, and the coil A1 of the first contactor KM1 and the second contactor KM2 is energized and closed, turning on the heating device. At the same time, the temperature and humidity detection is running. When the temperature is greater than 0°C and the humidity is less than 80%, the first temperature relay KTP1 and the humidity relay KH1 circuits are turned on, and the steps of the first case are repeated.

[0032] The third case: When the temperature and humidity do not meet the start-up conditions but in special circumstances such as operation and maintenance, it is necessary to start the machine immediately, manually close the switch Q1 for forced start, and the coil A1 of the third contactor KM3 is energized and attracted to repeat the steps of the first case. After confirming that the start-up is completed, manually open the switch Q1 for forced start. When the coil A1 of the third contactor KM3 is attracted, the normally open auxiliary contacts 13-14 of the third contactor KM3 are in a closed state, and the coil power supply of the third contactor KM3 is turned on. At this time, whether Q1 is disconnected or the temperature and humidity relay is disconnected, it will not affect its attraction state.

[0033] Furthermore, after starting, the operation of the heating system is controlled only by the converter control system, which independently controls the heating of the cabinet and the power cabinet through the first relay KA1 and the second relay KA2, and determines whether heating and dehumidification are needed according to the status of the temperature and humidity sensor;

[0034] If so, the 24V DC power supply is output to close the first relay KA1 and the second relay KA2, and the normally open contacts 1-2 of the two are closed, and the coils A1 of the first contactor KM1 and the second contactor KM2 are energized and closed, turning on the heating device. When the temperature and humidity meet the conditions, the control system disconnects the power supply of the first relay KA1 and the second relay KA2, and the coils of the first contactor KM1 and the second contactor KM2 are released, and the heating stops.

[0035] Furthermore, when the temperature of the control cabinet is greater than 60° C., the second temperature relay KTP2 is disconnected, the coil of the first contactor KM1 is de-energized and released, and the heating of the control cabinet is stopped.

[0036] In this embodiment, the heating and dehumidification control system realizes the automatic operation before and after the inverter is started. In special circumstances, the on-site operation and maintenance personnel only need to open the forced start switch once. The operation is simple, which prevents misoperation and greatly reduces the failure caused by human factors. The system realizes the start and operation of the inverter in various low temperature and high humidity environments, reduces the failure rate, and ensures its safe and stable operation. The circuit board in the control cabinet is sensitive to high temperature, and a temperature relay is added separately to prevent overheating, so that it runs at the most suitable temperature.

[0037] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wind power converter heating and dehumidification control system, characterized in that: It includes a first contactor KM1, a second contactor KM2, a third contactor KM3, a first temperature relay KTP1, a second temperature relay KTP2, a humidity relay KH1, a forced start switch Q1, a first relay KA1, a second relay KA2 and a 220V AC power supply; The 220V AC power supply is connected in parallel with three circuits, which respectively supply power to the coils of the first contactor KM1, the second contactor KM2, and the third contactor KM3; The coil A1 and the forced start switch Q1 of the third contactor KM3 are connected in series to the 220V AC power supply, and the normally open auxiliary contacts 1-2 of the first temperature relay KTP1 and the normally closed contacts 11-12 of the humidity relay KH1 are connected in series with the normally open auxiliary contacts 13-14 of the third contactor KM3 and then connected in parallel with the forced start switch Q1; The coil A1 of the first contactor KM1, the second temperature relay KTP2, and the normally closed auxiliary contacts 61-62 of the third contactor KM3 are connected in series to the 220V AC power supply, and the normally open contacts 1-2 of the first relay KA1 are connected in parallel with the normally closed auxiliary contacts 61-62 of the third contactor KM3; The coil A1 of the second contactor KM2 and the normally closed auxiliary contacts 51-52 of the third contactor KM3 are connected in series to the 220V AC power supply, and the normally open contacts 1-2 of the second relay KA2 are connected in parallel to the normally closed auxiliary contacts 51-52 of the third contactor KM3; The coils A2 of the first contactor KM1, the second contactor KM2 and the third contactor KM3 are all connected to the neutral line.

2. The wind power converter heating and dehumidification control system according to claim 1, characterized in that: The first contactor KM1 is a control cabinet contactor, the second contactor KM2 is a power cabinet heater contactor, and the third contactor KM3 is a UPS power supply contactor.

3. The wind power converter heating and dehumidification control system according to claim 1, characterized in that: The first temperature relay KTP1 is set to 0°C, the second temperature relay KTP2 is set to 60°C, and the humidity relay KH1 is set to 80%.

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