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Fault control method and device of offshore wind power DC sending-out system

A system failure, offshore wind power technology, applied in circuit devices, wind power generation, power transmission AC networks, etc., can solve the problem of not being able to ensure that the DC voltage is limited near the maximum limit

Active Publication Date: 2018-03-30
STATE GRID ZHEJIANG ELECTRIC POWER COMPANY ECONOMIC TECHN INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not require additional equipment, but it can only perform fault control within a certain range of wind farm voltage and frequency, and cannot guarantee that the DC voltage will be limited near the maximum limit

Method used

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  • Fault control method and device of offshore wind power DC sending-out system
  • Fault control method and device of offshore wind power DC sending-out system
  • Fault control method and device of offshore wind power DC sending-out system

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Embodiment 1

[0050] The present invention proposes a fault control method for offshore wind power direct current transmission system, such as figure 1 shown, including the following steps:

[0051] Step 1. For the positive and negative sequence dual synchronous rotating coordinate system current controller adopted by some power conversion power sources (double-fed fans), deduce the steady-state operating current expressions of new energy power sources under different control objectives.

[0052] Step 2. Considering the particularity of offshore new energy equipment, design a control strategy for the transmission system;

[0053] Step 3. In view of the serious failure of the transmission line on the AC side of the transmission system, the DC voltage continues to rise, which endangers the safety of the DC transmission system, and the control method is adopted to control the low wear resistance, that is, the low wear resistance is used to consume the excess on the DC line. Power, suppress th...

Embodiment 2

[0081] This embodiment provides a fault control device for an offshore wind power direct current transmission system, which includes:

[0082] Steady-state operating current expression derivation unit: For the positive and negative sequence dual synchronous rotating coordinate system current controllers used in some power conversion power supplies, the steady-state operating current expressions of new energy power supplies under different control objectives are derived;

[0083] Transmission system control strategy design unit: Considering the particularity of offshore new energy equipment, design the transmission system control strategy;

[0084] Low wear resistance control unit: Aiming at the problem that the DC voltage continues to rise and endanger the safety of the DC transmission system under serious faults in the AC side of the transmission system, the low wear resistance control method is adopted for control, that is, the low wear resistance is used to consume DC exces...

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Abstract

The invention discloses a fault control method and device of an offshore wind power DC sending-out system. A system control strategy under an existing fault only can be used for performing fault control under a certain wind power plant voltage and frequency range, and a DC voltage cannot be enabled to be limited at a value near to the highest limit value. According to the fault control method, a steady-state current expression of a new energy power supply under different control targets is derived with regard to a part of power conversion power supply employing a positive- and negative-sequence dual-synchronous rotation reference frame current controller; on the basis, a power transmission system control strategy is designed due to particularity of offshore new energy equipment; and surplus power on a DC circuit is consumed by low-tunneling suppression resistor, DC voltage rising is prevented, damage of overvoltage to a flexible DC power transmission line is prevented, stable running of the system is maintained, and the running safety and reliability of the offshore wind power DC sending-out system are improved.

Description

technical field [0001] The invention belongs to the technical field of grid connection of new energy power generation, in particular to a fault control method and device for an offshore wind power direct current transmission system. Background technique [0002] With the gradual depletion of fossil energy and the continuous aggravation of environmental pollution, the power generation technology using renewable energy has been widely valued by people. At this stage, wind farms are developing in the direction of large-scale and away from the load center. However, because a large amount of electric energy generated by wind farms cannot be consumed locally, it causes a lot of waste and needs to be transmitted to the load for a long distance. In the context of high wind power penetration, the particularity of wind power has become increasingly prominent, mainly manifested in the fact that the principles and characteristics of wind power and traditional synchronous machines are v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38
CPCH02J3/36H02J3/386Y02E10/76Y02E60/60
Inventor 李志强张利军钟宇军贾科兰洲孙轶恺张静徐晨博张哲任陈蕊张波袁翔范明霞
Owner STATE GRID ZHEJIANG ELECTRIC POWER COMPANY ECONOMIC TECHN INST
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