CN106655198B - Ship voltage drop suppression electrical system and control method thereof - Google Patents
Ship voltage drop suppression electrical system and control method thereof Download PDFInfo
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- CN106655198B CN106655198B CN201610962735.1A CN201610962735A CN106655198B CN 106655198 B CN106655198 B CN 106655198B CN 201610962735 A CN201610962735 A CN 201610962735A CN 106655198 B CN106655198 B CN 106655198B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Emergency Protection Circuit Devices (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a voltage drop suppression electrical system, which comprises an external power supply and a load, wherein a voltage current controller comprises a current closed-loop control module, is used for configuring a reference current and outputting a current regulation signal for enabling a power supply current to change along with the reference current; the voltage closed-loop control module is used for configuring a reference voltage and outputting a voltage regulating signal for enabling the power supply voltage to change along with the reference voltage; the voltage drop judging module is used for generating a first preset current larger than the reference current and a first preset voltage smaller than the reference voltage when judging voltage drop, and simultaneously replacing the reference current and the reference voltage with the first preset current and the first preset voltage respectively. When the ship is powered by the shore-based power system, the problems of current surge and voltage drop caused by heavy load starting are solved. The invention can control the amplitude of voltage drop, ensure the continuous operation of key electric equipment of the ship, and shorten the voltage recovery time to more than 400 milliseconds.
Description
Technical Field
The invention relates to the field of electrical system control, in particular to a voltage drop suppression electrical system.
Background
The variety of electrical systems is more, and the application is wider, wherein when high-power load on the ship suddenly starts, the output voltage of the shore-based ship power supply can be pulled down very fast, the current converter is usually replaced by a frequency converter, the strategy is mostly based on a motor driving control strategy, the response time to voltage drop is longer, and the power consumption requirement during the ship shore backing period can not be really met. The control strategy of the converter part is usually based on a motor-driven VVVF or vector control strategy, which allows the voltage to drop to 65% (voltage drop amplitude 35%), and allows the drop time to be longer (up to tens of seconds), and the load characteristics of the motor are single, and the converter part can also work for a long time under an under-voltage condition, but since the load on the ship has loads with various characteristics such as linear load, inductive load, nonlinear load, capacitive load and the like, and the voltage stability requirements on the ship such as radar, meters, sensors or refrigeration compressors are extremely high, the voltage drop time cannot exceed 1.5 seconds, the drop amplitude cannot exceed 20%, otherwise, all the devices can be stopped, and economic loss and running safety problems are caused to the ship. The increase of the voltage drop time can affect the load, if the load is a single load, the allowable drop time is longer, and if the load is a plurality of loads, once the voltage drop time is increased, the equipment with higher voltage stability is stopped, so that the safety problem is caused.
Disclosure of Invention
A first object of the present invention is to provide a ship power supply system, which solves the above technical problems;
a second object of the present invention is to provide a voltage drop suppression control method.
The technical problems solved by the invention can be realized by adopting the following technical scheme: a ship power supply system comprises an external power supply, a load and also comprises
The power supply manager is coupled with an external power supply and outputs power supply current, and is controlled by the voltage regulation signal and/or the current regulation signal to work;
the isolation transformer is coupled with the power supply manager to receive the power supply current and output a power supply voltage;
the voltage and current controller is respectively coupled with the isolation transformer and the power supply manager and samples the power supply current and the power supply voltage;
the voltage-current controller comprises
The current closed-loop control module is used for configuring a reference current and outputting a current regulation signal for enabling the power supply current to change along with the reference current;
the voltage closed-loop control module is used for configuring a reference voltage and outputting a voltage regulating signal for enabling the power supply voltage to change along with the reference voltage;
the voltage drop judging module is used for generating a first preset current larger than the reference current and a first preset voltage smaller than the reference voltage when judging voltage drop, and simultaneously replacing the reference current and the reference voltage with the first preset current and the first preset voltage respectively.
In general, a power supply system includes functions of rectification, inversion and the like, current and voltage corresponding to power and phase are output through a power manager, and voltage and current can be closed-loop controlled through a voltage-current controller, in the closed-loop control system, the output voltage and output current in the whole system, namely, the power supply voltage and the power supply current, are regulated through obtaining the reference current and the reference voltage, but if voltage sag conditions are met, the reference voltage current is replaced through a voltage sag judgment module, an excitation abrupt current limiting value can be preset, when the voltage sag occurs, the excitation current is suddenly increased, when the excitation current reaches a set value, the output voltage is reduced slightly in a short time to inhibit large current output caused by load abrupt increase, and the voltage is quickly and again increased to a rated voltage value.
Further, the voltage-current controller further comprises a delay module, the delay module is configured with a first preset time, when the power supply current reaches the first preset current, the delay module starts to work and replaces the reference voltage with the first preset voltage, when the first preset time arrives, the delay module outputs a reset signal, and the voltage drop judging module is controlled by the reset signal to stop working. By the sequential control and the design of the first preset time, the voltage reference value can be replaced in a short time, so that the voltage is reduced, but the voltage reduction time is required to be designed, and the inhibition time is not excessively long.
Further, the voltage-current controller further comprises a comparison module, the comparison module is used for comparing the first preset current with the power supply current, when the first preset current is equal to the power supply current, the comparison module outputs a permission signal, and the voltage-current controller is controlled by the permission signal to replace the reference voltage with the first preset voltage. The simple comparison logic is set through the comparison module, so that reasonable output voltage and current are ensured, and power supply and management are facilitated.
Further, the power supply manager comprises a frequency converter, and the frequency converter comprises a rectifier transformer, a rectifier circuit and an inverter circuit.
Further, the power manager also includes a sine filter coupled between the frequency converter and the isolation transformer.
Further, the output of the power manager is connected to the ship transformer by a cable.
In order to achieve the second object of the present invention, a control method for suppressing voltage sag, step 1, monitoring a power supply current in real time, and entering step 2 when the power supply current reaches a first preset current; step 2, adjusting the power supply voltage to be reduced to a first preset voltage; and 3, maintaining the first preset voltage for a first preset time, and recovering the power supply voltage to a normal state.
The beneficial effects are that: due to the adoption of the technical scheme, the problems of current impact and voltage drop caused by heavy load starting when the ship is powered by the shore-based power supply system are effectively solved, and therefore the usability of the shore-based ship power supply is ensured. The conventional shore power supply is easy to start or instantaneously downtime on a large load on a ship, or has long voltage recovery time, and the invention can control the amplitude of voltage drop and ensure the continuous operation of key electric equipment of the ship.
Drawings
FIG. 1 is a schematic diagram of a system topology of an embodiment of a marine power supply system of the present invention;
fig. 2 is a waveform diagram of an adjustment of an embodiment of the marine power supply system of the present invention.
Reference numerals: 100. a power supply manager; 110. a frequency converter; 200. a current-voltage controller; 210. and the voltage drop judging module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, taking a marine power supply system as an example, a marine power supply system will be briefly described,
the external power supply adopts the electric wire netting to supply power, power supply manager 100 includes converter 110, sine wave filter, cuts off straight transformer, wiring cabinet, and the wiring cabinet passes through cable coupling in each boats and ships, converter 110 includes rectifier transformer, rectifier circuit and inverter circuit. The frequency converter 110 includes a rectifier transformer, a rectifier circuit, and an inverter circuit. The sine filter is coupled between the frequency converter 110 and the isolation transformer. Each ship comprises two power supply systems, namely a shore power detection system and a ship power detection system, and under normal conditions, the influence caused by voltage drop in a switching mode is avoided, and a contact structure is arranged between the two systems, so that electric control switching is facilitated, but the voltage drop phenomenon is restrained by the technology at present.
Referring to fig. 1 again, the current-voltage controller 200 performs real-time sampling of output through current detection and voltage detection, so that a pair of actual output voltages can be output to adjust by instantly judging the voltage drop, that is, by changing the original reference voltage, the output voltages, the current and the voltage suppression effect can be achieved.
Referring to fig. 2, when an abrupt change of electromagnetic current is detected, the output voltage is delayed by 10 ms to reduce the voltage (half period), and current output is limited at time point 1. (unlike the carrier frequency of 1kHz of the traditional converter, the invention ensures that the output voltage waveform has high smoothness, and the time for voltage recovery can be in millisecond level); based on the constant power output control of the power grid (different from the VVF control or vector control of the traditional converter, the PQ control mode is adopted to adjust the output power of the converter, so as to ensure the constant power output in the stable working process of the converter); reactive power and active power can be controlled (voltage fluctuation caused by abrupt load change can cause unbalanced output when the multiple converters are operated in parallel, and the function of balanced output of the multiple converters is realized by detecting and controlling reactive current and active current, so that the recovery time of the voltage fluctuation is shortened.
Particularly, the ship power supply system has more load conditions, so that voltage drop needs to be restrained in time to ensure that the whole power supply system is not affected, and meanwhile, pollution caused by power generation by using a ship-mounted power supply is avoided. Further, the output of the power manager 100 is connected to a ship transformer by a cable. A voltage sag suppression electrical system comprising an external power source and a load, and further comprising a power manager 100 coupled to the external power source and outputting a supply current, controlled by a voltage regulation signal and/or a current regulation signal; an isolation transformer coupled to the power manager 100 for receiving the power current and outputting a power voltage; a voltage-current controller coupled to the isolation transformer and the power manager 100, respectively, and sampling a power supply current and a power supply voltage; the voltage-current controller comprises a current closed-loop control module, a current control module and a voltage-current control module, wherein the current closed-loop control module is used for configuring a reference current and outputting a current regulation signal for enabling a power supply current to change along with the reference current; the voltage closed-loop control module is used for configuring a reference voltage and outputting a voltage regulating signal for enabling the power supply voltage to change along with the reference voltage; the voltage sag judging module 210 generates a first preset current greater than the reference current and a first preset voltage smaller than the reference voltage when judging the voltage sag, and replaces the reference current and the reference voltage with the first preset current and the first preset voltage respectively.
In general, a power supply system includes functions of rectification and inversion, and outputs current and voltage corresponding to power and phase through a power manager, and voltage and current can be closed-loop controlled through a voltage-current controller, in the closed-loop control system, the output voltage and output current in the whole system, namely, the supply voltage and the supply current, are regulated through obtaining the reference current and the reference voltage, but if voltage sag condition is met, the reference voltage current is replaced through a voltage sag judging module 210, an excitation abrupt current limiting value can be preset, when the voltage sag happens, the excitation current suddenly increases, when the excitation current reaches a set value, the output voltage is reduced slightly in a short time, so as to inhibit large current output caused by load abrupt increase, and the voltage is quickly and again increased to a rated voltage value.
Further, the voltage-current controller further includes a delay module, the delay module configures a first preset time, when the power supply current reaches the first preset current, the delay module starts to work and replaces the reference voltage with the first preset voltage, when the first preset time arrives, the delay module outputs a reset signal, and the voltage drop judging module 210 is controlled by the reset signal to stop working. By the sequential control and the design of the first preset time, the voltage reference value can be replaced in a short time, so that the voltage is reduced, but the voltage reduction time is required to be designed, and the inhibition time is not excessively long. The voltage-current controller also comprises a comparison module, wherein the comparison module is used for comparing the first preset current with the power supply current, when the first preset current is equal to the power supply current, the comparison module outputs a permission signal, and the voltage-current controller is controlled by the permission signal to replace the reference voltage with the first preset voltage. The simple comparison logic is set through the comparison module, so that reasonable output voltage and current are ensured, and power supply and management are facilitated.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included within the scope of the present invention.
Claims (7)
1. The ship power supply system comprises an external power supply and a ship load, and is characterized by further comprising a power supply manager which is coupled with the external power supply and outputs power supply current, and is controlled by a voltage regulation signal and/or a current regulation signal to work;
the isolation transformer is coupled with the power supply manager to receive the power supply current and output a power supply voltage;
the voltage and current controller is respectively coupled with the isolation transformer and the power supply manager and samples the power supply current and the power supply voltage;
the voltage-current controller comprises
The current closed-loop control module is used for configuring a reference current and outputting a current regulation signal for enabling the power supply current to change along with the reference current;
the voltage closed-loop control module is used for configuring a reference voltage and outputting a voltage regulating signal for enabling the power supply voltage to change along with the reference voltage;
the voltage drop judging module receives the power supply current, generates a first preset voltage smaller than the reference voltage when the power supply current is larger than a first preset current value, and replaces the reference voltage with the first preset voltage.
2. The ship power supply system according to claim 1, wherein the voltage and current controller further comprises a delay module, the delay module is configured for a first preset time, when the power supply current reaches the first preset current, the delay module starts to work and replaces the reference voltage with the first preset voltage, when the first preset time arrives, the delay module outputs a reset signal, and the voltage drop judging module is controlled by the reset signal to stop working.
3. The marine power supply system of claim 1, wherein the voltage-current controller further comprises a comparison module for comparing the magnitude of the first preset current with the magnitude of the supply current, the comparison module outputting a permission signal when the first preset current is equal to the supply current, the voltage-current controller being controlled by the permission signal to replace the reference voltage with the first preset voltage.
4. A marine power supply system as claimed in claim 1, wherein the power manager comprises a frequency converter comprising a rectifier transformer, a rectifier circuit and an inverter circuit.
5. The marine power supply system of claim 4, wherein the power manager further comprises a sine filter coupled between the frequency converter and the isolation transformer.
6. A marine power supply system as claimed in claim 5 wherein the output of the power manager is connected to a marine transformer by a cable.
7. A voltage drop suppression control method using a ship power supply system as claimed in any one of claims 1-6, characterized in that,
step 1, a voltage current controller is coupled with a power supply manager, monitors power supply current in real time, and enters step 2 when the power supply current reaches a first preset current;
step 2, the voltage drop judging module adjusts the power supply voltage to be reduced to a first preset voltage;
and 3, maintaining the first preset voltage for a first preset time by the time delay module, and recovering the power supply voltage to a normal state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610962735.1A CN106655198B (en) | 2016-10-28 | 2016-10-28 | Ship voltage drop suppression electrical system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610962735.1A CN106655198B (en) | 2016-10-28 | 2016-10-28 | Ship voltage drop suppression electrical system and control method thereof |
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| Publication Number | Publication Date |
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| CN106655198A CN106655198A (en) | 2017-05-10 |
| CN106655198B true CN106655198B (en) | 2023-07-28 |
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| CN201610962735.1A Active CN106655198B (en) | 2016-10-28 | 2016-10-28 | Ship voltage drop suppression electrical system and control method thereof |
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| CN113224768B (en) * | 2021-06-03 | 2022-08-05 | 东方日立(成都)电控设备有限公司 | Shore power supply control method and system for impact-resistant load |
Citations (7)
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| JP2007151218A (en) * | 2005-11-24 | 2007-06-14 | Nishishiba Electric Co Ltd | Marine power system |
| CN102005779A (en) * | 2010-11-17 | 2011-04-06 | 浙江运达风电股份有限公司 | Converter-based low voltage ride through control system of wind generating set |
| CN102545646A (en) * | 2012-01-18 | 2012-07-04 | 华北电力大学 | Abnormal voltage ride-through power supply of frequency converter |
| CN103887818A (en) * | 2014-03-17 | 2014-06-25 | 电子科技大学 | Low-voltage ride-through control method for grid-connected inverter |
| CN104467027A (en) * | 2014-12-08 | 2015-03-25 | 深圳市科陆变频器有限公司 | Intelligent shore power system and grid connection method |
| CN105656071A (en) * | 2016-03-11 | 2016-06-08 | 特变电工新疆新能源股份有限公司 | Flexible direct-current low-voltage penetration control method suitable for non-double-end communication |
| CN206226019U (en) * | 2016-10-28 | 2017-06-06 | 上海电气富士电机电气技术有限公司 | A kind of ship Voltage Drop suppresses electrical system |
-
2016
- 2016-10-28 CN CN201610962735.1A patent/CN106655198B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007151218A (en) * | 2005-11-24 | 2007-06-14 | Nishishiba Electric Co Ltd | Marine power system |
| CN102005779A (en) * | 2010-11-17 | 2011-04-06 | 浙江运达风电股份有限公司 | Converter-based low voltage ride through control system of wind generating set |
| CN102545646A (en) * | 2012-01-18 | 2012-07-04 | 华北电力大学 | Abnormal voltage ride-through power supply of frequency converter |
| CN103887818A (en) * | 2014-03-17 | 2014-06-25 | 电子科技大学 | Low-voltage ride-through control method for grid-connected inverter |
| CN104467027A (en) * | 2014-12-08 | 2015-03-25 | 深圳市科陆变频器有限公司 | Intelligent shore power system and grid connection method |
| CN105656071A (en) * | 2016-03-11 | 2016-06-08 | 特变电工新疆新能源股份有限公司 | Flexible direct-current low-voltage penetration control method suitable for non-double-end communication |
| CN206226019U (en) * | 2016-10-28 | 2017-06-06 | 上海电气富士电机电气技术有限公司 | A kind of ship Voltage Drop suppresses electrical system |
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