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Wind power has become one of the most popular renewables recently. The unscheduled quick fluctuations in wind power, called ramps, bring many problems to power system. Conventional ramp event forecasting methods focus on sudden change in wind speed and direction. However, in some special cases such as ice storm, icing event causes changes in wind turbine output and facility failure rate. The output...
With the rapid increase of grid-integrated capacity of wind farms, the risk of power system blackouts has increased significantly for the reason that output of wind farms is of fluctuation and uncertainty. The potential of wind farms participating in power system restoration after blackouts has not been adequately excavated. This paper firstly proposes a hybrid black start unit(BSU) containing combustion...
With the increase of wind power penetration, the impact of wind power ramp event on power system becomes more and more serious. To assess the impact of it on power system, the characteristic and development process of wind power ramp event is analyzed, and a time-dependent outage model of conventional generators which is appropriate to wind power ramp event is constructed base on Monte-Carlo method...
For the rotor speed of variable speed wind turbine (VSWT) is decoupled from system frequency, the system equivalent rotary inertia and primary frequency control ability are decreased with wind power penetration growing continuously. To solve the problems, VSWT with additional frequency control was studied. The dynamic characteristics of input and output power of VSWT during participating in system...
Because of the intermittent and uncertainty of wind power, the change rate and amplitude of power system net-load increase with wind power penetration growing continuously. The prediction error of wind power generation capacity is large, so it's difficult to quantify its impact on AGC adjustment capacity and incorporate wind power maximally. To solve the problem, an active power real-time control...
In order to coordinate the electric power and energy balance with the space scales and spatial scales among different level dispatching center, a leader-follower hierarchical decision model is proposed for taking advantage of the wind speed complementary characteristic of multi regional wind farms. With the STACKELBERG decision strategies, a coordination decision model of the electric power and energy...
To study the potential impact of the ever-increasing wind farm on future power grid, realistic long term time series of future wind generation at individual sites as well as for the system as a whole are required. This paper proposes a method to simulate time series of hourly wind speed. An ARMA(p, q) model with transformation procedure to a stationary process is chose to simulate the hourly wind...
With large-scale wind farms integrated into the grid, to insure the security of the point of common coupling (PCC), and decrease the control action cost of the discrete equipment, an area automatic voltage control strategy considering ultra-short-term wind power forecasting is proposed. Area AVC is divided into three hierarchies: system wide control, wind farm level control and equipment level. In...
A new model and the relevant algorithm for the power system probabilistic cost production simulation with wind power penetration based on chronological load curve using universal generating function methods of multi-state system theory considering the characteristics of both load and wind power are presented in this paper. The power output models of wind farm, conventional units and load considering...
In recent years, wind power in China is developing rapidly, with specific characteristics of large- scale, high concentration and remote distance. With large scale wind farms integrated into grid, the voltage and reactive power problem is worth concentrating on. Based on this situation, a strategy of area automatic voltage control (Area- AVC) is proposed to solve it. AVC is divided into three hierarchies:...
Appropriate models of wind farm are necessary for the power system stability study with large scale wind farm penetration. In this paper, an aggregated wind farm model with doubly fed induction generator (DFIG) based wind turbine for small signal stability study is proposed to deal with the situation that the wind turbines operate receiving different incoming wind speeds. The different control strategies...
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